EP1359289A1 - Sicherheitsventil im Bohrlock - Google Patents

Sicherheitsventil im Bohrlock Download PDF

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Publication number
EP1359289A1
EP1359289A1 EP02075825A EP02075825A EP1359289A1 EP 1359289 A1 EP1359289 A1 EP 1359289A1 EP 02075825 A EP02075825 A EP 02075825A EP 02075825 A EP02075825 A EP 02075825A EP 1359289 A1 EP1359289 A1 EP 1359289A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston
fluid
valve
safety valve
Prior art date
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.)
Withdrawn
Application number
EP02075825A
Other languages
English (en)
French (fr)
Inventor
Willem Van Den Dobbelsteen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP02075825A priority Critical patent/EP1359289A1/de
Publication of EP1359289A1 publication Critical patent/EP1359289A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole

Definitions

  • the invention relates to a downhole safety valve for preventing blow-outs in a hydrocarbon fluid production well.
  • the downhole safety valve comprises a cup-shaped piston and cylinder assembly, a fluid inlet connected to the interior of the piston, a fluid outlet connected to the exterior of the cylinder and means for pushing the piston down within the cylinder.
  • the piston and cylinder have perforated tubular walls, which perforations are at least partly aligned if the piston is pushed down into a lower position within the cylinder, but which perforations are unaligned such that flow of hydrocarbon fluid from the fluid inlet to the fluid outlet is interrupted if the piston is pushed up within the cylinder in response to an increase of the pressure of the hydrocarbon fluid in the fluid inlet.
  • the fluid outlet may be connected to an annular space surrounding the outer surface of the tubular wall of the cylinder.
  • said means for pushing down the piston within the cylinder comprises a hydraulic or pneumatic fluid injection system for injecting a control fluid into the fluid chamber formed between the closed tops of the cup-shaped piston and cylinder.
  • the pressure of the control fluid in said fluid chamber may be controlled by a pressure control system which accurately adjusts the pressure of the control fluid and limits said pressure below a pre-set value.
  • a spring pushes the piston up within the cylinder.
  • the pressure of the control fluid in said fluid chamber may be controlled by a pressure control system which limits said pressure to a pre-set value and is designed to gradually adjust the pressure of the control fluid such that the piston can be moved gradually within the cylinder into any intermediate position between said upper and lower positions, and the valve can be gradually opened and closed.
  • Figure 1 depicts a downhole safety valve 1 which comprises a cup-shaped piston 2 which is movably arranged within a cup-shaped cylinder 3 and which is illustrated in a lower position thereof wherein an array of perforations 4 in the tubular wall 2A of the piston 2 is aligned with an array of perforations 5 in the tubular wall 3A of the cylinder 3 and the valve is in a fully opened position.
  • the aligned perforations 4 and 5 provide fluid communication between the interior 6 of the piston 2 and an annular space 7 that surrounds the tubular wall 3A of the cylinder 3.
  • the interior 6 of the piston 2 is in direct fluid communication with an inlet port 8, which is formed within a ring-shaped bottom part 9 of the valve 1.
  • the annular space 7 is connected in fluid communication with an outlet 10 of the valve 1 by a series of axial outlet ports 11 that are drilled in a flange which surrounds a disk-shaped top 3B of the cylinder 3 and which secures the cylinder 3 within a tubular valve housing 13 which is screwed between a lower end ring 14 and an upper lock mandrel 15.
  • a pair of packing rings 16 is mounted in grooves in the outer surface of the valve housing 13 and the upper lock mandrel 15 which in use provide a seal against the inner wall of the production tubing (not shown) through which oil and/or gas are produced to surface.
  • a locking ring assembly 17 which retrievably locks the locking mandrel 15 and valve housing 13 to a recess in the inner wall of the production tubing.
  • a hydraulic conduit is arranged in the annular space surrounding the production tubing and is connected via a port opening in the wall of the production tubing to the annular space between the upper and lower packing rings 16.
  • a channel 18 drilled through the valve housing 13 and the top 3B of the cylinder 3 provides fluid provides a supply conduit for hydraulic fluid from said annular space between the packing rings 16 into a fluid chamber 20 formed between the top 2B of the piston 2 and the top 3B of the cylinder.
  • hydraulic fluid is injected into said fluid chamber 20 at a controlled pressure. If this pressure is higher than the pressure of the produced hydrocarbon fluid in the interior 6 of the piston 2, then the piston 2 will be pushed down in the cylinder 3 to the lower position shown in Fig.1 wherein the lower end of the piston 2 rests on the ring-shaped bottom part 9 of the valve 1 and the perforations 4 and 5 in the piston 2 and cylinder 3 are aligned and the valve is in the open position and hydrocarbon fluid flows up from a lower part of the production tubing below the valve via the valve inlet 8, the interior of the piston 2 the perforation 4 and 5 , the annular space 7 and the axial ports 11 and the valve outlet 10 into an upper part of the production tubing.
  • the piston can be gradually moved between the fully open and fully closed positions into a series of intermediate positions in which the perforations 4 and 5 are only partly aligned and the valve is partly opened and performs as an adjustable downhole choke.
  • the valve 1 can be installed within the production tubing by lowering the valve 1 and locking mandrel 15 through the tubing by a wireline until the locking ring 17 is locked into a recess in the inner wall of the production tubing at a depth of about 100 metres below the wellhead.
  • a spring may push the piston 2 up into the cylinder 3 in order to ensure that the valve 1 is always closed in case the hydraulic fluid supply to the chamber 20 is interrupted, even in the absence of an overpressure of the produced hydrocarbon fluids in the interior 6 of the piston 2.
  • the valve according to the invention comprises a minimum of wear prone components and is compact and can be easily transported and installed in and removed from a well.
  • the valve therefore provides an adequate and efficient protection against uncontrolled flow of hydrocarbon fluid to the wellhead if any well or production equipment is damaged so that the risk of a well blow out is reduced significantly.
  • valve according to the invention as a controllable subsurface production choke is attractive since in many well the pressure of the produced gas has to be throttled back in a production choke at the earth surface, which then cools down the gas such that gas hydrates are formed, which may plug and disrupt the production facilities. If the gas pressure is reduced downhole then the heat present in the well tubulars, annuli and surrounding formation will reduce the cool down rate of the gas and inhibit the formation of gas hydrates.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Safety Valves (AREA)
EP02075825A 2002-03-01 2002-03-01 Sicherheitsventil im Bohrlock Withdrawn EP1359289A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02075825A EP1359289A1 (de) 2002-03-01 2002-03-01 Sicherheitsventil im Bohrlock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02075825A EP1359289A1 (de) 2002-03-01 2002-03-01 Sicherheitsventil im Bohrlock

Publications (1)

Publication Number Publication Date
EP1359289A1 true EP1359289A1 (de) 2003-11-05

Family

ID=28799705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02075825A Withdrawn EP1359289A1 (de) 2002-03-01 2002-03-01 Sicherheitsventil im Bohrlock

Country Status (1)

Country Link
EP (1) EP1359289A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020152478A1 (en) * 2019-01-25 2020-07-30 Pragma Well Technology Limited Pressure actuated downhole device
CN114704223A (zh) * 2022-04-24 2022-07-05 四川大学 一种高压气井可分离式自动分级降压装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814181A (en) * 1972-12-29 1974-06-04 Schlumberger Technology Corp Ambient pressure responsive safety valve
US4691778A (en) * 1987-02-09 1987-09-08 Pyne R David G Downhole water flow controller for aquifer storage recovery wells
US5979572A (en) * 1995-03-24 1999-11-09 Uwg Limited Flow control tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814181A (en) * 1972-12-29 1974-06-04 Schlumberger Technology Corp Ambient pressure responsive safety valve
US4691778A (en) * 1987-02-09 1987-09-08 Pyne R David G Downhole water flow controller for aquifer storage recovery wells
US5979572A (en) * 1995-03-24 1999-11-09 Uwg Limited Flow control tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020152478A1 (en) * 2019-01-25 2020-07-30 Pragma Well Technology Limited Pressure actuated downhole device
US11891879B2 (en) 2019-01-25 2024-02-06 Pragma Well Technology Limited Pressure actuated downhole device
CN114704223A (zh) * 2022-04-24 2022-07-05 四川大学 一种高压气井可分离式自动分级降压装置
CN114704223B (zh) * 2022-04-24 2022-11-18 四川大学 一种高压气井可分离式自动分级降压装置

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