US20070240875A1 - Choke for controlling the flow of drilling mud - Google Patents

Choke for controlling the flow of drilling mud Download PDF

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Publication number
US20070240875A1
US20070240875A1 US11/769,540 US76954007A US2007240875A1 US 20070240875 A1 US20070240875 A1 US 20070240875A1 US 76954007 A US76954007 A US 76954007A US 2007240875 A1 US2007240875 A1 US 2007240875A1
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United States
Prior art keywords
drilling
drilling fluid
choke
alternating
outlet
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US11/769,540
Inventor
Egbert Van Riet
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Smith International Inc
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At Balance Americas LLC
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Filing date
Publication date
Application filed by At Balance Americas LLC filed Critical At Balance Americas LLC
Priority to US11/769,540 priority Critical patent/US20070240875A1/en
Publication of US20070240875A1 publication Critical patent/US20070240875A1/en
Assigned to AT-BALANCE AMERICAS LLC reassignment AT-BALANCE AMERICAS LLC PATENT ASSIGNMENT AND LICENSE AGREEMENT Assignors: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V., SHELL OIL COMPANY
Assigned to SMITH INTERNATIONAL, INC. reassignment SMITH INTERNATIONAL, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: AT-BALANCE AMERICAS LLC
Abandoned legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10Valve arrangements in drilling-fluid circulation systems
    • E21B21/106Valve arrangements outside the borehole, e.g. kelly valves

Definitions

  • the present invention is related to a drilling system, more particularly, a system for controlling formation pressure while drilling.
  • the pressure is controlled by pumping fluid into the bore hole, via the annulus.
  • a drilling fluid outlet system could further comprise a safety choke, in case the pump fails.
  • the invention relates to a drilling system for drilling a well bore into an earth formation, comprising:
  • a drilling fluid outlet system comprising choke means for choking the returned flow of retrieved drilling fluid and alternating means for alternating the flow direction through the choke means.
  • the invention relates also to a drilling fluid outlet system.
  • the invention in another aspect relates to a method of drilling a well bore into an earth formation.
  • the method comprises:
  • FIG. 1 shows a schematic view of a drilling system according to the invention
  • FIG. 2 shows a schematic view of a first embodiment of a drilling fluid outlet system according to the invention.
  • FIG. 3 shows a second embodiment of a drilling fluid outlet system according to the invention.
  • a drilling system comprising an drilling fluid outlet system that comprises choke means for choking the returned flow of retrieved drilling fluid and alternating means for alternating the flow direction through the choke means.
  • the drilling fluid outlet system comprises an inlet and an outlet
  • the choke means comprise a first inlet/outlet connection, a second outlet/inlet connection and the alternating means connect the inlet alternatingly to the first or second connection and the outlet alternatingly to the second or first connection. So with these alternating means it is possible to connect the choke means such that the inlet is used as an inlet or outlet and that at the same time the outlet is used as outlet or inlet.
  • filter means are arranged in the first and second connection of the choke means.
  • the alternating means comprise a four way valve, having four connections and wherein the connections are connected two by two. With such a valve, which could be actuated automatically, alternating of the flow is performed quickly. This will provide a minimum interruption of the flow.
  • the drilling fluid outlet system comprises an accumulator.
  • This accumulator secures a constant flow at the moment that the flow direction is alternated.
  • the choking means comprises a bi-directional choke.
  • a bi-directional choke provides a choking action in both flow directions. This provides for a compact design.
  • the choking means comprise at least two uni-directional chokes.
  • Such uni-directional chokes provide a choking action in only one flow direction. Therefore two chokes are necessary to provide a choking action in both flow directions.
  • FIG. 1 shows a schematic view of a drilling system 1 according to the invention. With this drilling system 1 a well bore 2 is drilled into the earth formation 3 .
  • the drilling system 1 comprises a frame 4 onto which a fluid chamber 5 is slidably arranged along a guide 6 .
  • a drill string 7 with on its bottom end a drill bit 8 is rotated by a top drive 9 in order to drill the well bore 2 .
  • the well bore 2 is partially lined with a casing 10 .
  • the drill string 7 is composes out of a plurality of drill string joints 11 , which are interconnected by connectors 12 a and 12 b .
  • Drill mud contained in a reservoir 13 is pumped by pump 14 into the drill string 7 to the drill bit 8 .
  • the drilling mud 25 flows into the annulus between the well bore wall and the drill string 7 upwards.
  • the annulus is closed off by a rotating blow out preventer 15 .
  • the drilling mud is returned via pipe 16 and drilling fluid outlet system 17 back to the reservoir 13 .
  • pump 18 which pumps the drilling fluid into the chamber 5 , such that it can flow into the drill string 7 .
  • the drilling fluid outlet system 17 ensures that a certain pressure is maintained in the well bore 2 by choking the flow in the pipe 16 .
  • FIG. 2 the drilling fluid outlet system 17 is shown in more detail.
  • the system 17 comprises a valve 20 and a bidirectional choke 21 .
  • the inlet pipe 16 is connected to the first connection pipe 22 of the choke 21 .
  • the outlet pipe 19 is connected to the second connection 23 of the choke 21 .
  • the valve 20 is rotated, such that the inlet pipe 16 is connected to the second connection 23 of the choke 21 and the outlet pipe 19 is connected to the first connection 22 of the choke 21 . In this way the flow direction is alternated and any debris, which is clogging the choke 21 is flushed away through outlet pipe 19 .
  • FIG. 3 a second embodiment 30 of a drilling fluid outlet system according to the invention is shown.
  • the system 30 again comprises a valve 31 and two uni-directional chokes 32 and 33 .
  • Such chokes 32 , 33 have a choking action in just one flow direction.
  • the system 30 comprises filter means 34 , 35 that filters large debris in the mud, which could damage the chokes 32 , 33 .
  • An accumulator 36 is connected to the inlet pipe 16 , which ensures that a constant flow is maintained while the flow direction of the system 30 is alternated by turning the valve 31 . Any debris present on the filter means 34 , 35 or in the chokes 32 , 33 is cleaned by alternating the flow direction of the system 30 and is flushed away through outlet pipe 19 .
  • WO-00 79092 discloses a drilling system for drilling a well bore into an earth formation, comprising:

Abstract

A drilling system and method for drilling a well bore in to an earth formation is provided with drilling means for drilling a well bore and pumping means for pumping drilling fluid into the wellbore during drilling. Also provided is a drilling outlet system for retrieving drilling fluid from the well bore. The drilling fluid outlet system has choke means for choking the return flow of retrieved drilling fluid, and alternating means for alternating the flow direction through the choking means.

Description

    CROSS REFERENCE TO EARLIER APPICATION
  • The present application is a continuation application of U.S. application Ser. No. 10/520,606 filed 6 Jan. 2005, which is a national stage application of International application No. PCT/EP2003/006750, which claims priority on European Patent Application 02254746.7 filed 8 Jul. 2002.
  • BACKGROUND OF THE INVENTION
  • The present invention is related to a drilling system, more particularly, a system for controlling formation pressure while drilling.
  • According to prior art systems, the pressure is controlled by pumping fluid into the bore hole, via the annulus. Such a drilling fluid outlet system could further comprise a safety choke, in case the pump fails.
  • However due to large rock debris or contaminated mud, the safety choke could get clogged or could be damaged, which jeopardises correct control over the pressure in the well bore.
  • SUMMARY OF THE INVENTION
  • The invention relates to a drilling system for drilling a well bore into an earth formation, comprising:
      • drilling means for drilling a well bore;
      • pumping means for pumping drilling fluid into the well bore during drilling; and
      • a drilling fluid outlet system for retrieving drilling fluid from the well bore.
  • It is an object of the invention to alleviate the disadvantages of the prior art and to provide a system that is capable of regulating the pressure while the flow may contain large rock debris or contaminated mud.
  • This object is achieved by a drilling fluid outlet system comprising choke means for choking the returned flow of retrieved drilling fluid and alternating means for alternating the flow direction through the choke means.
  • The invention relates also to a drilling fluid outlet system.
  • In another aspect the invention relates to a method of drilling a well bore into an earth formation.
  • In accordance with this aspect of the invention, the method comprises:
      • drilling the well bore by operating drilling means;
      • pumping drilling fluid into the well bore during said drilling; and
      • retrieving drilling fluid from the well bore in a drilling fluid outlet system, said drilling fluid outlet system comprising choke means for choking the return flow of retrieved drilling fluid, whereby the flow direction of retrieved drilling fluid through the choking means is alternated for flushing away any debris from the choke means.
  • The invention will be now illustrated by way of example and in conjunction with the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWING
  • In the accompanying drawing:
  • FIG. 1 shows a schematic view of a drilling system according to the invention;
  • FIG. 2 shows a schematic view of a first embodiment of a drilling fluid outlet system according to the invention; and
  • FIG. 3 shows a second embodiment of a drilling fluid outlet system according to the invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Described is a drilling system comprising an drilling fluid outlet system that comprises choke means for choking the returned flow of retrieved drilling fluid and alternating means for alternating the flow direction through the choke means.
  • So if the choke means would get clogged, the returned flow is alternated, such that the choke means are cleaned and the debris is discharged.
  • According to a preferred embodiment, the drilling fluid outlet system comprises an inlet and an outlet, the choke means comprise a first inlet/outlet connection, a second outlet/inlet connection and the alternating means connect the inlet alternatingly to the first or second connection and the outlet alternatingly to the second or first connection. So with these alternating means it is possible to connect the choke means such that the inlet is used as an inlet or outlet and that at the same time the outlet is used as outlet or inlet.
  • In another embodiment of the drilling system according to the invention, filter means are arranged in the first and second connection of the choke means.
  • These filter means block large pieces, which could damage the choke means. Upon alternating the flow direction blocked pieces at the filter means are discharged.
  • In again another embodiment of the drilling system according to the invention, the alternating means comprise a four way valve, having four connections and wherein the connections are connected two by two. With such a valve, which could be actuated automatically, alternating of the flow is performed quickly. This will provide a minimum interruption of the flow.
  • Preferably, the drilling fluid outlet system comprises an accumulator. This accumulator secures a constant flow at the moment that the flow direction is alternated.
  • In yet another embodiment of the drilling system according to the invention, the choking means comprises a bi-directional choke. Such a bi-directional choke provides a choking action in both flow directions. This provides for a compact design.
  • In another embodiment the choking means comprise at least two uni-directional chokes. Such uni-directional chokes provide a choking action in only one flow direction. Therefore two chokes are necessary to provide a choking action in both flow directions.
  • FIG. 1 shows a schematic view of a drilling system 1 according to the invention. With this drilling system 1 a well bore 2 is drilled into the earth formation 3.
  • The drilling system 1 comprises a frame 4 onto which a fluid chamber 5 is slidably arranged along a guide 6. A drill string 7 with on its bottom end a drill bit 8 is rotated by a top drive 9 in order to drill the well bore 2. The well bore 2 is partially lined with a casing 10. The drill string 7 is composes out of a plurality of drill string joints 11, which are interconnected by connectors 12 a and 12 b. Drill mud contained in a reservoir 13 is pumped by pump 14 into the drill string 7 to the drill bit 8. The drilling mud 25 flows into the annulus between the well bore wall and the drill string 7 upwards. The annulus is closed off by a rotating blow out preventer 15. The drilling mud is returned via pipe 16 and drilling fluid outlet system 17 back to the reservoir 13. When connecting another drill string joint 11 the feed of drilling mud is taken over by pump 18, which pumps the drilling fluid into the chamber 5, such that it can flow into the drill string 7.
  • The drilling fluid outlet system 17 ensures that a certain pressure is maintained in the well bore 2 by choking the flow in the pipe 16.
  • In FIG. 2 the drilling fluid outlet system 17 is shown in more detail. The system 17 comprises a valve 20 and a bidirectional choke 21. In the position of the valve 20 as shown in FIG. 2 the inlet pipe 16 is connected to the first connection pipe 22 of the choke 21. The outlet pipe 19 is connected to the second connection 23 of the choke 21. When the choke 21 gets clogged, the valve 20 is rotated, such that the inlet pipe 16 is connected to the second connection 23 of the choke 21 and the outlet pipe 19 is connected to the first connection 22 of the choke 21. In this way the flow direction is alternated and any debris, which is clogging the choke 21 is flushed away through outlet pipe 19.
  • In FIG. 3 a second embodiment 30 of a drilling fluid outlet system according to the invention is shown. The system 30 again comprises a valve 31 and two uni-directional chokes 32 and 33. Such chokes 32,33 have a choking action in just one flow direction. Furthermore, the system 30 comprises filter means 34,35 that filters large debris in the mud, which could damage the chokes 32,33. An accumulator 36 is connected to the inlet pipe 16, which ensures that a constant flow is maintained while the flow direction of the system 30 is alternated by turning the valve 31. Any debris present on the filter means 34,35 or in the chokes 32,33 is cleaned by alternating the flow direction of the system 30 and is flushed away through outlet pipe 19.
  • It is remarked that WO-00 79092, for example, discloses a drilling system for drilling a well bore into an earth formation, comprising:
      • drilling means for drilling a well bore;
      • pumping means for pumping drilling fluid into the well bore during drilling; and
      • a drilling fluid outlet system for retrieving drilling fluid from the well bore. The drilling fluid outlet system is used to maintain control over the fluid pressure at the well bore wall, especially when drilling is stopped or during tripping of the drill string out of the bore hole. Without maintaining control over the pressure, there is a potential danger that undesired fluid flows from the earth formation into the bore hole, or that the borehole wall collapses.
  • While the illustrative embodiments of the invention have been described with particularity, it will be understood that various other modifications will be readily apparent to, and can easily be made by one skilled in the art without departing from the spirit of the invention. Accordingly, it is not intended that the scope of the following claims be limited to the examples and descriptions set forth herein but rather that the claims be constructed as encompassing all features which would be treated as equivalents thereof by those skilled in the art to which this invention pertains.

Claims (16)

1. A drilling system for drilling a well bore into an earth formation, comprising:
drilling means for drilling a well bore;
pumping means for pumping drilling fluid into the well bore during drilling; and
a drilling fluid outlet system for retrieving drilling fluid from the well bore, said drilling fluid outlet system comprising a choke means for choking the return flow of retrieved drilling fluid, and alternating means for alternating the flow direction through the choking means.
2. The drilling system according to claim 1, wherein the drilling fluid outlet system comprises an accumulator.
3. The drilling system according to claim 2, wherein the alternating means comprise a four way valve, having four connections and wherein the connections are connected two by two.
4. The drilling system according to claim 2, wherein the choking means comprise a bidirectional choke.
5. The drilling system according to claim 1, wherein the choking means comprise at least two unidirectional chokes.
6. The drilling system according to claim 5, wherein the alternating means comprise a four way valve, having four connections and wherein the connections are connected two by two.
7. The drilling system according to claim 1, wherein the alternating means comprise a four way valve, having four connections connected two by two, and wherein the choking means comprise a bi-directional choke.
8. The drilling system according to claim 1, wherein wherein the drilling fluid outlet system comprises an inlet and an outlet, the choke means comprise a first inlet/outlet connection, a second outlet/inlet connection, and the alternating means connect the inlet alternatingly to the first or second connection and the outlet alternatingly to the second or first connection and wherein the alternating means comprise a four way valve, having four connections and wherein the connections are connected two by two.
9. The drilling system according to claim 1, wherein wherein the drilling fluid outlet system comprises an inlet and an outlet, the choke means comprise a first inlet/outlet connection, a second outlet/inlet connection, and the alternating means connect the inlet alternatingly to the first or second connection and the outlet alternatingly to the second or first connection and wherein the alternating means comprise a four way valve, having four connections connected two by two, and wherein the choking means comprise a bi-directional choke.
10. A drilling fluid outlet system connectable to a well bore for receiving a return flow of drilling mud retrieved from the well bore and discharging the drilling mud into a reservoir, the drilling fluid outlet system comprising a choke means for choking the return flow of retrieved drilling fluid, and alternating means for alternating the flow direction through the choking means.
11. The drilling fluid outlet system according to claim 10, wherein the drilling fluid outlet system comprises an inlet and an outlet, the choke means comprise a first inlet/outlet connection, a second outlet/inlet connection, and the alternating means connect the inlet alternatingly to the first or second connection and the outlet alternatingly to the second or first connection.
12. The drilling fluid outlet system according to claim 11, wherein filter means are arranged in the first and second connection of the choke means.
13. The drilling fluid outlet system according to claim 10, wherein the alternating means comprise a four way valve, having four connections and wherein the connections are connected two by two.
14. The drilling fluid outlet system according to claim 10, wherein the drilling fluid outlet system comprises an accumulator.
15. The drilling fluid outlet system according to claim 10, wherein the choking means comprise a bi-directional choke.
16. The drilling fluid outlet system according to claim 10, wherein the choking means comprise at least two unidirectional chokes.
US11/769,540 2002-07-08 2007-06-27 Choke for controlling the flow of drilling mud Abandoned US20070240875A1 (en)

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US11/769,540 US20070240875A1 (en) 2002-07-08 2007-06-27 Choke for controlling the flow of drilling mud

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EP02254746 2002-07-08
EP02254746.7 2002-07-08
US10/520,606 US20060086538A1 (en) 2002-07-08 2003-06-24 Choke for controlling the flow of drilling mud
PCT/EP2003/006750 WO2004005667A1 (en) 2002-07-08 2003-06-24 Choke for controlling the flow of drilling mud
US11/769,540 US20070240875A1 (en) 2002-07-08 2007-06-27 Choke for controlling the flow of drilling mud

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US10/520,606 Continuation US20060086538A1 (en) 2002-07-08 2003-06-24 Choke for controlling the flow of drilling mud
PCT/EP2003/006750 Continuation WO2004005667A1 (en) 2002-07-08 2003-06-24 Choke for controlling the flow of drilling mud

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US11/769,540 Abandoned US20070240875A1 (en) 2002-07-08 2007-06-27 Choke for controlling the flow of drilling mud

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080105434A1 (en) * 2006-11-07 2008-05-08 Halliburton Energy Services, Inc. Offshore Universal Riser System
US20110203802A1 (en) * 2010-02-25 2011-08-25 Halliburton Energy Services, Inc. Pressure control device with remote orientation relative to a rig
US8201628B2 (en) 2010-04-27 2012-06-19 Halliburton Energy Services, Inc. Wellbore pressure control with segregated fluid columns
US8281875B2 (en) 2008-12-19 2012-10-09 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US20130192360A1 (en) * 2012-01-26 2013-08-01 Halliburton Energy Services, Inc. Systems, methods and devices for analyzing drilling fluid
US8739863B2 (en) 2010-11-20 2014-06-03 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp
US8820405B2 (en) 2010-04-27 2014-09-02 Halliburton Energy Services, Inc. Segregating flowable materials in a well
US8833488B2 (en) 2011-04-08 2014-09-16 Halliburton Energy Services, Inc. Automatic standpipe pressure control in drilling
US9080407B2 (en) 2011-05-09 2015-07-14 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9163473B2 (en) 2010-11-20 2015-10-20 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp and safety latch
US9249638B2 (en) 2011-04-08 2016-02-02 Halliburton Energy Services, Inc. Wellbore pressure control with optimized pressure drilling
US9447647B2 (en) 2011-11-08 2016-09-20 Halliburton Energy Services, Inc. Preemptive setpoint pressure offset for flow diversion in drilling operations
WO2016179136A1 (en) * 2015-05-06 2016-11-10 Schlumberger Technology Corporation Continuous mud circulation during drilling operations
US9605507B2 (en) 2011-09-08 2017-03-28 Halliburton Energy Services, Inc. High temperature drilling with lower temperature rated tools
JP2017153477A (en) * 2016-02-29 2017-09-07 株式会社グリーンプロデュース Method of forming hole in which seedlings are planted, and tool used for method thereof
US10408010B2 (en) 2015-12-08 2019-09-10 Schlumberger Technology Corporaton Pipe ram assembly for many actuation cycles
US10428601B2 (en) 2015-12-07 2019-10-01 Schlumberger Technology Corporation Proximity detection between tubulars for blind stabbing
US10508509B2 (en) 2015-12-08 2019-12-17 Schlumberger Technology Corporation Devices for continuous mud-circulation drilling systems

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7185719B2 (en) 2002-02-20 2007-03-06 Shell Oil Company Dynamic annular pressure control apparatus and method
US8955619B2 (en) * 2002-05-28 2015-02-17 Weatherford/Lamb, Inc. Managed pressure drilling
US7350590B2 (en) 2002-11-05 2008-04-01 Weatherford/Lamb, Inc. Instrumentation for a downhole deployment valve
US7413018B2 (en) * 2002-11-05 2008-08-19 Weatherford/Lamb, Inc. Apparatus for wellbore communication
OA13240A (en) 2003-08-19 2007-01-31 Shell Int Research Drilling system and method.
US7407019B2 (en) * 2005-03-16 2008-08-05 Weatherford Canada Partnership Method of dynamically controlling open hole pressure in a wellbore using wellhead pressure control
US7836973B2 (en) * 2005-10-20 2010-11-23 Weatherford/Lamb, Inc. Annulus pressure control drilling systems and methods
US9567843B2 (en) 2009-07-30 2017-02-14 Halliburton Energy Services, Inc. Well drilling methods with event detection
NO338372B1 (en) 2010-06-03 2016-08-15 Statoil Petroleum As System and method for passing matter in a flow passage
WO2012134302A2 (en) * 2011-03-31 2012-10-04 National Oilwell Varco Norway As Method and device for preventing a mud relief valve from incorrect opening
US9823373B2 (en) 2012-11-08 2017-11-21 Halliburton Energy Services, Inc. Acoustic telemetry with distributed acoustic sensing system
CA2942411C (en) 2014-03-21 2020-07-21 Canrig Drilling Technology Ltd. Back pressure control system
US11149506B2 (en) 2014-05-19 2021-10-19 Expro Americas, Llc System for controlling wellbore pressure during pump shutdowns
US9988866B2 (en) 2014-12-12 2018-06-05 Halliburton Energy Services, Inc. Automatic choke optimization and selection for managed pressure drilling
US10590719B2 (en) * 2017-02-23 2020-03-17 Cameron International Corporation Manifold assembly for a mineral extraction system
US10364622B2 (en) * 2017-02-23 2019-07-30 Cameron International Corporation Manifold assembly for a mineral extraction system
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Citations (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684688A (en) * 1949-03-02 1954-07-27 Thornhill Craver Company Inc Automatic valve and system
US3354970A (en) * 1965-02-08 1967-11-28 Pan American Petroleum Corp Controlling high-pressure wells while drilling
US3365009A (en) * 1966-07-12 1968-01-23 Gerald E. Burnham Drilling fluid circulation system having flow parameter regulating means
US3443643A (en) * 1966-12-30 1969-05-13 Cameron Iron Works Inc Apparatus for controlling the pressure in a well
US3508577A (en) * 1967-04-05 1970-04-28 Pan American Petroleum Corp Blowout control valve for drilling well
US3677353A (en) * 1970-07-15 1972-07-18 Cameron Iron Works Inc Apparatus for controlling well pressure
US3827511A (en) * 1972-12-18 1974-08-06 Cameron Iron Works Inc Apparatus for controlling well pressure
US4044834A (en) * 1975-04-09 1977-08-30 Perkins Lee E Apparatus and method for controlling the flow of fluids from a well bore
US4133768A (en) * 1978-03-31 1979-01-09 Theriot Joseph G Flow choke filter for oil and gas wells
US4257442A (en) * 1976-09-27 1981-03-24 Claycomb Jack R Choke for controlling the flow of drilling mud
US4377177A (en) * 1979-04-16 1983-03-22 Claycomb Jack R Throttling mud choke apparatus
US4630675A (en) * 1985-05-28 1986-12-23 Smith International Inc. Drilling choke pressure limiting control system
US4653597A (en) * 1985-12-05 1987-03-31 Atlantic Richfield Company Method for circulating and maintaining drilling mud in a wellbore
US4700739A (en) * 1985-11-14 1987-10-20 Smith International, Inc. Pneumatic well casing pressure regulating system
US4709900A (en) * 1985-04-11 1987-12-01 Einar Dyhr Choke valve especially used in oil and gas wells
US5010966A (en) * 1990-04-16 1991-04-30 Chalkbus, Inc. Drilling method
US5305836A (en) * 1992-04-08 1994-04-26 Baroid Technology, Inc. System and method for controlling drill bit usage and well plan
US5437308A (en) * 1988-12-30 1995-08-01 Institut Francais Du Petrole Device for remotely actuating equipment comprising a bean-needle system
US5443128A (en) * 1992-12-14 1995-08-22 Institut Francais Du Petrole Device for remote actuating equipment comprising delay means
US5474142A (en) * 1993-04-19 1995-12-12 Bowden; Bobbie J. Automatic drilling system
US5857522A (en) * 1996-05-03 1999-01-12 Baker Hughes Incorporated Fluid handling system for use in drilling of wellbores
US5890549A (en) * 1996-12-23 1999-04-06 Sprehe; Paul Robert Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus
US6035952A (en) * 1996-05-03 2000-03-14 Baker Hughes Incorporated Closed loop fluid-handling system for use during drilling of wellbores
US6119772A (en) * 1997-07-14 2000-09-19 Pruet; Glen Continuous flow cylinder for maintaining drilling fluid circulation while connecting drill string joints
US6176323B1 (en) * 1997-06-27 2001-01-23 Baker Hughes Incorporated Drilling systems with sensors for determining properties of drilling fluid downhole
US6189612B1 (en) * 1997-03-25 2001-02-20 Dresser Industries, Inc. Subsurface measurement apparatus, system, and process for improved well drilling, control, and production
US6325159B1 (en) * 1998-03-27 2001-12-04 Hydril Company Offshore drilling system
US6352129B1 (en) * 1999-06-22 2002-03-05 Shell Oil Company Drilling system
US6374925B1 (en) * 2000-09-22 2002-04-23 Varco Shaffer, Inc. Well drilling method and system
US6394195B1 (en) * 2000-12-06 2002-05-28 The Texas A&M University System Methods for the dynamic shut-in of a subsea mudlift drilling system
US6412554B1 (en) * 2000-03-14 2002-07-02 Weatherford/Lamb, Inc. Wellbore circulation system
US20020112888A1 (en) * 2000-12-18 2002-08-22 Christian Leuchtenberg Drilling system and method
US6484816B1 (en) * 2001-01-26 2002-11-26 Martin-Decker Totco, Inc. Method and system for controlling well bore pressure
US6571873B2 (en) * 2001-02-23 2003-06-03 Exxonmobil Upstream Research Company Method for controlling bottom-hole pressure during dual-gradient drilling
US6575244B2 (en) * 2001-07-31 2003-06-10 M-I L.L.C. System for controlling the operating pressures within a subterranean borehole
US20050006150A1 (en) * 2003-07-07 2005-01-13 Power Chokes, L.P. Solids strainer system for a hydraulic choke
US20050092523A1 (en) * 2003-10-30 2005-05-05 Power Chokes, L.P. Well pressure control system
US6904981B2 (en) * 2002-02-20 2005-06-14 Shell Oil Company Dynamic annular pressure control apparatus and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528577A (en) * 1968-08-13 1970-09-15 Irving B Rose Lift and dump device
EP0947750A3 (en) * 1998-04-03 2001-07-04 Cemi Piscine Service S.r.l. Five-way butterfly valve
US6119779A (en) * 1998-11-09 2000-09-19 Atlantic Richfield Company Method and system for separating and disposing of solids from produced fluids

Patent Citations (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684688A (en) * 1949-03-02 1954-07-27 Thornhill Craver Company Inc Automatic valve and system
US3354970A (en) * 1965-02-08 1967-11-28 Pan American Petroleum Corp Controlling high-pressure wells while drilling
US3365009A (en) * 1966-07-12 1968-01-23 Gerald E. Burnham Drilling fluid circulation system having flow parameter regulating means
US3443643A (en) * 1966-12-30 1969-05-13 Cameron Iron Works Inc Apparatus for controlling the pressure in a well
US3508577A (en) * 1967-04-05 1970-04-28 Pan American Petroleum Corp Blowout control valve for drilling well
US3677353A (en) * 1970-07-15 1972-07-18 Cameron Iron Works Inc Apparatus for controlling well pressure
US3827511A (en) * 1972-12-18 1974-08-06 Cameron Iron Works Inc Apparatus for controlling well pressure
US4044834A (en) * 1975-04-09 1977-08-30 Perkins Lee E Apparatus and method for controlling the flow of fluids from a well bore
US4257442A (en) * 1976-09-27 1981-03-24 Claycomb Jack R Choke for controlling the flow of drilling mud
US4133768A (en) * 1978-03-31 1979-01-09 Theriot Joseph G Flow choke filter for oil and gas wells
US4377177A (en) * 1979-04-16 1983-03-22 Claycomb Jack R Throttling mud choke apparatus
US4709900A (en) * 1985-04-11 1987-12-01 Einar Dyhr Choke valve especially used in oil and gas wells
US4630675A (en) * 1985-05-28 1986-12-23 Smith International Inc. Drilling choke pressure limiting control system
US4700739A (en) * 1985-11-14 1987-10-20 Smith International, Inc. Pneumatic well casing pressure regulating system
US4653597A (en) * 1985-12-05 1987-03-31 Atlantic Richfield Company Method for circulating and maintaining drilling mud in a wellbore
US5437308A (en) * 1988-12-30 1995-08-01 Institut Francais Du Petrole Device for remotely actuating equipment comprising a bean-needle system
US5010966A (en) * 1990-04-16 1991-04-30 Chalkbus, Inc. Drilling method
US5305836A (en) * 1992-04-08 1994-04-26 Baroid Technology, Inc. System and method for controlling drill bit usage and well plan
US5443128A (en) * 1992-12-14 1995-08-22 Institut Francais Du Petrole Device for remote actuating equipment comprising delay means
US5474142A (en) * 1993-04-19 1995-12-12 Bowden; Bobbie J. Automatic drilling system
US5857522A (en) * 1996-05-03 1999-01-12 Baker Hughes Incorporated Fluid handling system for use in drilling of wellbores
US6035952A (en) * 1996-05-03 2000-03-14 Baker Hughes Incorporated Closed loop fluid-handling system for use during drilling of wellbores
US5890549A (en) * 1996-12-23 1999-04-06 Sprehe; Paul Robert Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus
US5975219A (en) * 1996-12-23 1999-11-02 Sprehe; Paul Robert Method for controlling entry of a drillstem into a wellbore to minimize surge pressure
US6189612B1 (en) * 1997-03-25 2001-02-20 Dresser Industries, Inc. Subsurface measurement apparatus, system, and process for improved well drilling, control, and production
US6176323B1 (en) * 1997-06-27 2001-01-23 Baker Hughes Incorporated Drilling systems with sensors for determining properties of drilling fluid downhole
US6119772A (en) * 1997-07-14 2000-09-19 Pruet; Glen Continuous flow cylinder for maintaining drilling fluid circulation while connecting drill string joints
US6325159B1 (en) * 1998-03-27 2001-12-04 Hydril Company Offshore drilling system
US6352129B1 (en) * 1999-06-22 2002-03-05 Shell Oil Company Drilling system
US6412554B1 (en) * 2000-03-14 2002-07-02 Weatherford/Lamb, Inc. Wellbore circulation system
US6374925B1 (en) * 2000-09-22 2002-04-23 Varco Shaffer, Inc. Well drilling method and system
US6527062B2 (en) * 2000-09-22 2003-03-04 Vareo Shaffer, Inc. Well drilling method and system
US6394195B1 (en) * 2000-12-06 2002-05-28 The Texas A&M University System Methods for the dynamic shut-in of a subsea mudlift drilling system
US20020112888A1 (en) * 2000-12-18 2002-08-22 Christian Leuchtenberg Drilling system and method
US20030079912A1 (en) * 2000-12-18 2003-05-01 Impact Engineering Solutions Limited Drilling system and method
US6484816B1 (en) * 2001-01-26 2002-11-26 Martin-Decker Totco, Inc. Method and system for controlling well bore pressure
US6571873B2 (en) * 2001-02-23 2003-06-03 Exxonmobil Upstream Research Company Method for controlling bottom-hole pressure during dual-gradient drilling
US6575244B2 (en) * 2001-07-31 2003-06-10 M-I L.L.C. System for controlling the operating pressures within a subterranean borehole
US6904981B2 (en) * 2002-02-20 2005-06-14 Shell Oil Company Dynamic annular pressure control apparatus and method
US20050006150A1 (en) * 2003-07-07 2005-01-13 Power Chokes, L.P. Solids strainer system for a hydraulic choke
US20050092523A1 (en) * 2003-10-30 2005-05-05 Power Chokes, L.P. Well pressure control system

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080105434A1 (en) * 2006-11-07 2008-05-08 Halliburton Energy Services, Inc. Offshore Universal Riser System
US9376870B2 (en) 2006-11-07 2016-06-28 Halliburton Energy Services, Inc. Offshore universal riser system
US8033335B2 (en) 2006-11-07 2011-10-11 Halliburton Energy Services, Inc. Offshore universal riser system
US9085940B2 (en) 2006-11-07 2015-07-21 Halliburton Energy Services, Inc. Offshore universal riser system
US9157285B2 (en) 2006-11-07 2015-10-13 Halliburton Energy Services, Inc. Offshore drilling method
US8881831B2 (en) 2006-11-07 2014-11-11 Halliburton Energy Services, Inc. Offshore universal riser system
US9127511B2 (en) 2006-11-07 2015-09-08 Halliburton Energy Services, Inc. Offshore universal riser system
US9127512B2 (en) 2006-11-07 2015-09-08 Halliburton Energy Services, Inc. Offshore drilling method
US8776894B2 (en) 2006-11-07 2014-07-15 Halliburton Energy Services, Inc. Offshore universal riser system
US8887814B2 (en) 2006-11-07 2014-11-18 Halliburton Energy Services, Inc. Offshore universal riser system
US9051790B2 (en) 2006-11-07 2015-06-09 Halliburton Energy Services, Inc. Offshore drilling method
US8281875B2 (en) 2008-12-19 2012-10-09 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US8397836B2 (en) 2009-12-15 2013-03-19 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US8286730B2 (en) 2009-12-15 2012-10-16 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9169700B2 (en) 2010-02-25 2015-10-27 Halliburton Energy Services, Inc. Pressure control device with remote orientation relative to a rig
US20110203802A1 (en) * 2010-02-25 2011-08-25 Halliburton Energy Services, Inc. Pressure control device with remote orientation relative to a rig
US8820405B2 (en) 2010-04-27 2014-09-02 Halliburton Energy Services, Inc. Segregating flowable materials in a well
US8261826B2 (en) 2010-04-27 2012-09-11 Halliburton Energy Services, Inc. Wellbore pressure control with segregated fluid columns
US8201628B2 (en) 2010-04-27 2012-06-19 Halliburton Energy Services, Inc. Wellbore pressure control with segregated fluid columns
US8739863B2 (en) 2010-11-20 2014-06-03 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp
US10145199B2 (en) 2010-11-20 2018-12-04 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp and safety latch
US9163473B2 (en) 2010-11-20 2015-10-20 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp and safety latch
US8833488B2 (en) 2011-04-08 2014-09-16 Halliburton Energy Services, Inc. Automatic standpipe pressure control in drilling
US9249638B2 (en) 2011-04-08 2016-02-02 Halliburton Energy Services, Inc. Wellbore pressure control with optimized pressure drilling
US9080407B2 (en) 2011-05-09 2015-07-14 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9605507B2 (en) 2011-09-08 2017-03-28 Halliburton Energy Services, Inc. High temperature drilling with lower temperature rated tools
US9447647B2 (en) 2011-11-08 2016-09-20 Halliburton Energy Services, Inc. Preemptive setpoint pressure offset for flow diversion in drilling operations
US9134291B2 (en) * 2012-01-26 2015-09-15 Halliburton Energy Services, Inc. Systems, methods and devices for analyzing drilling fluid
US20130192360A1 (en) * 2012-01-26 2013-08-01 Halliburton Energy Services, Inc. Systems, methods and devices for analyzing drilling fluid
US10233708B2 (en) 2012-04-10 2019-03-19 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
WO2016179136A1 (en) * 2015-05-06 2016-11-10 Schlumberger Technology Corporation Continuous mud circulation during drilling operations
US10830009B2 (en) 2015-05-06 2020-11-10 Schlumberger Technology Corporation Continuous mud circulation during drilling operations
US10428601B2 (en) 2015-12-07 2019-10-01 Schlumberger Technology Corporation Proximity detection between tubulars for blind stabbing
US10408010B2 (en) 2015-12-08 2019-09-10 Schlumberger Technology Corporaton Pipe ram assembly for many actuation cycles
US10508509B2 (en) 2015-12-08 2019-12-17 Schlumberger Technology Corporation Devices for continuous mud-circulation drilling systems
JP2017153477A (en) * 2016-02-29 2017-09-07 株式会社グリーンプロデュース Method of forming hole in which seedlings are planted, and tool used for method thereof

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