CN102996092B - Hydraulic-control double-stage well test blowout preventer - Google Patents
Hydraulic-control double-stage well test blowout preventer Download PDFInfo
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- CN102996092B CN102996092B CN201210441937.3A CN201210441937A CN102996092B CN 102996092 B CN102996092 B CN 102996092B CN 201210441937 A CN201210441937 A CN 201210441937A CN 102996092 B CN102996092 B CN 102996092B
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- axially extending
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- extending bore
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Abstract
The invention discloses a hydraulic-control double-stage well test blowout preventer, comprising a lower joint, a connecting body, a seal sleeve, a seal box, a primary piston, a secondary piston and a hydraulic cylinder, wherein the upper end of the lower joint is tightly connected with the lower end of the connecting body; the upper end of the connecting body is tightly connected with the lower end of the seal sleeve; the seal box is arranged inside the seal sleeve; the secondary piston is arranged inside the primary piston and arranged inside the hydraulic cylinder together with the primary piston; a primary seal mechanism is arranged inside the seal sleeve; a secondary seal mechanism is arranged inside the seal box; the primary piston acts on the primary seal mechanism; the second piston acts on the secondary seal mechanism, and the secondary seal mechanism can play a part only when the primary seal mechanism becomes invalid. By adopting the hydraulic-control double-stage well test blowout preventer, the problems of bad use effect, difficult tripping of a well test tool, low operating efficiency, short service life, and poor reliability of the existing hydraulic-control blowout preventer are solved.
Description
Technical field
The invention belongs to oil gas field test-drilling blowout prevention box technical field, be specifically related to a kind of Hydraulic-control double-stage well test blowout preventer.
Technical background
The blowout prevention box that current oil gas field steel wire well testing uses is single-stage hydraulic control steel wire blowout prevention box, employing be that the mode compressing one group of sealed packing by hydraulic piston seals steel wire.When well head pressure is higher, in order to better sealing, what usually take is that the mode of thrust increasing piston carrys out press seal packing.But after thrust increases, the resistance that steel wire can be caused to transfer increases, and instrument enters well difficulty; Meanwhile, in the well testing operation of high-pressure oil-gas well, the sealed packing due to existing blowout prevention box is subject to the wearing and tearing of steel wire and the effect of Oil/gas Well high pressure for a long time and easily loses envelope, and thorn leakage accident even well control accident occurs.
Summary of the invention
The technical problem that the present invention solves: a kind of Hydraulic-control double-stage well test blowout preventer is provided, solves that existing liquid controlled blowout preventing box result of use is bad, enter difficulty under well testing instrument, operating efficiency is low, application life is short, the problem of poor reliability.
Technical scheme of the present invention is: a kind of Hydraulic-control double-stage well test blowout preventer comprises lower contact, connector, sealing shroud, seal box, first stage piston, second piston and fluid cylinder; The upper end of described lower contact and the lower end of connector are tightly connected, and the upper end of connector and the lower end of sealing shroud are tightly connected, and lower contact, connector are all shaped with axially extending bore I; The bottom of described sealing shroud is shaped with axially extending bore II, top is shaped with cavity, primary seal packing is arranged in axially extending bore II and the lower end of axially extending bore II is provided with pressure cap I, depression bar is positioned at the bottom of cavity, seal box is arranged on the step of cavity bottom, and secondary seal packing is arranged in the axially extending bore III on seal box and the lower end of axially extending bore III is provided with pressure cap II; Fluid cylinder is arranged on the upper end of sealing shroud, first stage piston is arranged in fluid cylinder and its lower end is extended with uniform connecting rod, connecting rod is connected with the upper end of depression bar through after the gathering sill that seal box outer wall is shaped with, second piston is arranged in the inner chamber of first stage piston and the extension rod of its lower end is arranged in axially extending bore III, upper end extends to the top of fluid cylinder, and make the upper end of first stage piston inner chamber and form upper sealing and lower seal respectively between lower end and second piston, step place on described second piston is shaped with annular groove, and annular groove seals between lower seal on described; The connecting rod that described first stage piston lower end extends is set with return spring I, and on the lower surface making return spring I upper and lower end withstand on first stage piston respectively and on the upper surface of seal box, the extension rod of described second piston lower end is set with return spring II, and on the lower surface making return spring II upper and lower end withstand on second piston respectively and on the upper surface of seal box; Described axially extending bore I, axially extending bore II, cavity, axially extending bore III, first stage piston and second piston have identical axle center.
The lower surface of described first stage piston is extended with four uniform connecting rods, seal box outer wall is shaped with four corresponding gathering sills, four connecting rods are connected with the upper end of depression bar after being each passed through four corresponding gathering sills.
Described depression bar is T-shape structure, and its upper end is connected with connecting rod, and lower end is arranged in axially extending bore II.
The lower end of the axially extending bore I in described lower contact is provided with fairlead.
The present invention's advantage compared with prior art:
1, seal box is arranged in sealing shroud by the present invention, and two-stage sealing system shares a fluid cylinder, only needs a hydraulic power source to provide hydraulic coupling, compact conformation during onsite application, easy to use;
2, the present invention can need to adjust hydraulic pressure according to scene, and when sealed packing does not wear and tear, hydraulic pressure is minimum, along with the increase hydraulic pressure of the sealed packing degree of wear increases gradually, reduces the wearing and tearing of sealed packing, extends the application life of blowout prevention box;
3, seal box of the present invention just started to work after sealing shroud loses efficacy, and thorn can be avoided to leak and occur, improve well testing operation success rate;
4, present invention decreases enter difficulty under high pressure pushing up the testing tool that causes, improve operating efficiency, reduce operating cost.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention, and Fig. 2 is the B-B sectional view of Fig. 1.
Detailed description of the invention
Below in conjunction with accompanying drawing 1,2, a kind of embodiment of the present invention is described.
A kind of Hydraulic-control double-stage well test blowout preventer comprises lower contact 1, connector 2, sealing shroud 3, seal box 4, first stage piston 5, second piston 6 and fluid cylinder 7; The upper end of described lower contact 1 and the lower end of connector 2 are tightly connected, and the upper end of connector 2 and the lower end of sealing shroud 3 are tightly connected, and lower contact 1, connector 2 are all shaped with axially extending bore I 8; The bottom of described sealing shroud 3 is shaped with axially extending bore II 10, top is shaped with cavity 11, primary seal packing 12 is arranged in axially extending bore II 10 and the lower end of axially extending bore II 10 is provided with pressure cap I 9, depression bar 16 is positioned at the bottom of cavity 11, seal box 4 is arranged on the step 26 of cavity 11 bottom, and secondary seal packing 13 is arranged in the axially extending bore III 14 on seal box 4 and the lower end of axially extending bore III 14 is provided with pressure cap II 15.
Fluid cylinder 7 is arranged on the upper end of sealing shroud 3, first stage piston 5 is arranged in fluid cylinder 7, and the lower surface of first stage piston 5 is extended with four uniform connecting rods 18, seal box 4 outer wall is shaped with after four corresponding gathering sill 21, four connecting rods 18 are each passed through four corresponding gathering sills 21 and is connected with the upper end of depression bar 16; Described depression bar 16 is in T-shape structure, and its upper end is connected with connecting rod 18, and lower end is arranged in axially extending bore II 10; Second piston 6 is arranged in the inner chamber of first stage piston 5 and the extension rod of its lower end is arranged in axially extending bore III 14, upper end extends to the top of fluid cylinder 7, and make the upper end of first stage piston 5 inner chamber and formed respectively between lower end and second piston 6 to seal and lower seal, step place on described second piston 6 is shaped with annular groove 20, and annular groove 20 seals between lower seal on described;
The connecting rod 18 that described first stage piston 5 lower end extends is set with return spring I 17, and on the lower surface making return spring I 17 upper and lower end withstand on first stage piston 5 respectively and on the upper surface of seal box 4, the extension rod of described second piston 6 lower end is set with return spring II 19, and on the lower surface making return spring II 19 upper and lower end withstand on second piston 6 respectively and on the upper surface of seal box 4.Described axially extending bore I 8, axially extending bore II 10, cavity 11, axially extending bore III 14, first stage piston 5 and second piston 6 have identical axle center.The lower end of the axially extending bore I 8 in described lower contact 1 is provided with fairlead 24.
The course of work: first the connecting thread of lower contact 1 lower end is connected with shaft mouth test, then to be connected with hydraulic system by the hydraulic oil inlet 25 on fluid cylinder 7 and to pressurize for fluid cylinder 7, first stage piston 5 is setting in motion under action of hydraulic force, primary seal packing 12 in compression seal cover 3, ensures that the primary seal packing 12 in sealing shroud 3 has certain sealing force to entering well steel wire.Now, only have the primary seal packing 12 pairs of function of wire in sealing shroud 3, the wearing and tearing of primary seal packing 12 can be reduced, extend application life of blowout prevention box, and too large transfer resistance owing to causing, can operating cost be reduced, make testing tool normally enter well, start steel wire operation.Because steel wire is long-time and sealed packing contact friction, the primary seal packing 12 in sealing shroud 3 can be made to wear and tear gradually, the hydraulic coupling promotion first stage piston that now only need increase in fluid cylinder 7 continues to press down primary seal packing and can ensure sealing effectiveness.
When the primary seal packing 12 in sealing shroud 3 can not seal due to serious wear, stroke is covered by the step place that now first stage piston 5 also moves to second piston 6, the upper sealing formed between the sealing ring 22 that first stage piston 5 inner chamber upper end has and second piston 6 is no longer worked, namely sealing ring 22 is moved in the annular groove 20 that the step place on second piston 6 is shaped with and loses sealing function, the lower seal formed between the sealing ring 23 that first stage piston 5 inner chamber and second piston 6 lower end have simultaneously starts to work, hydraulic coupling is delivered on second piston 6, promote second piston 6 setting in motion, secondary seal packing 13 in compression seal box 4, continue sealing steel wire.
Above-described embodiment, just preferred embodiment of the present invention, is not used for limiting the scope of the present invention, therefore all equivalent variations done with content described in the claims in the present invention, all should be included within the claims in the present invention scope.
Claims (4)
1. a Hydraulic-control double-stage well test blowout preventer, is characterized in that:
Described blowout prevention box comprises lower contact (1), connector (2), sealing shroud (3), seal box (4), first stage piston (5), second piston (6) and fluid cylinder (7); The upper end of described lower contact (1) and the lower end of connector (2) are tightly connected, and the upper end of connector (2) and the lower end of sealing shroud (3) are tightly connected, and lower contact (1), connector (2) are all shaped with axially extending bore I (8);
The bottom of described sealing shroud (3) is shaped with axially extending bore II (10), top is shaped with cavity (11), primary seal packing (12) is arranged in axially extending bore II (10) and the lower end of axially extending bore II (10) is provided with pressure cap I (9), depression bar (16) is positioned at the bottom of cavity (11), seal box (4) is arranged on the step (26) of cavity (11) bottom, and secondary seal packing (13) is arranged in the axially extending bore III (14) on seal box (4) and the lower end of axially extending bore III (14) is provided with pressure cap II (15);
Fluid cylinder (7) is arranged on the upper end of sealing shroud (3), first stage piston (5) is arranged in fluid cylinder (7) and its lower end is extended with uniform connecting rod (18), connecting rod (18) is connected with the upper end of depression bar (16) afterwards through the gathering sill (21) that seal box (4) outer wall is shaped with, second piston (6) is arranged in the inner chamber of first stage piston (5) and the extension rod of its lower end is arranged in axially extending bore III (14), upper end extends to the top of fluid cylinder (7), and make the upper end of first stage piston (5) inner chamber and formed respectively between lower end and second piston (6) to seal and lower seal, step place on described second piston (6) is shaped with annular groove (20), and annular groove (20) seals between lower seal on described,
The connecting rod (18) that described first stage piston (5) lower end extends is set with return spring I (17), and on the lower surface making return spring I (17) upper and lower end withstand on first stage piston (5) respectively and on the upper surface of seal box (4), the extension rod of described second piston (6) lower end is set with return spring II (19), and on the lower surface making return spring II (19) upper and lower end withstand on second piston (6) respectively and on the upper surface of seal box (4);
Described axially extending bore I (8), axially extending bore II (10), cavity (11), axially extending bore III (14), first stage piston (5) and second piston (6) have identical axle center.
2. a kind of Hydraulic-control double-stage well test blowout preventer according to claim 1, it is characterized in that: the lower surface of described first stage piston (5) is extended with four uniform connecting rods (18), seal box (4) outer wall is shaped with four corresponding gathering sills (21), four connecting rods (18) are each passed through four corresponding gathering sills (21) and are connected with the upper end of depression bar (16) afterwards.
3. a kind of Hydraulic-control double-stage well test blowout preventer according to claim 1 and 2, is characterized in that: described depression bar (16) is in T-shape structure, and its upper end is connected with connecting rod (18), and lower end is arranged in axially extending bore II (10).
4. a kind of Hydraulic-control double-stage well test blowout preventer according to claim 3, is characterized in that: the lower end of the axially extending bore I (8) in described lower contact (1) is provided with fairlead (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210441937.3A CN102996092B (en) | 2012-11-07 | 2012-11-07 | Hydraulic-control double-stage well test blowout preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210441937.3A CN102996092B (en) | 2012-11-07 | 2012-11-07 | Hydraulic-control double-stage well test blowout preventer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102996092A CN102996092A (en) | 2013-03-27 |
| CN102996092B true CN102996092B (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210441937.3A Expired - Fee Related CN102996092B (en) | 2012-11-07 | 2012-11-07 | Hydraulic-control double-stage well test blowout preventer |
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| Country | Link |
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| CN (1) | CN102996092B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331957A (en) * | 2019-08-06 | 2019-10-15 | 宝鸡瑞林石油机电设备有限责任公司 | A kind of repeatedly setting expansion type fracture packer |
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| CN2695617Y (en) * | 2004-04-09 | 2005-04-27 | 项振生 | Casing pump bouble-stage pneumatic anti-blowout box for oil production |
| CN200985762Y (en) * | 2006-09-30 | 2007-12-05 | 侯宁 | Blowout prevention double stage polish rod sealer |
| CN201041011Y (en) * | 2007-05-08 | 2008-03-26 | 赵战中 | Multifunctional polish rod sealing device |
| CN201280908Y (en) * | 2008-11-07 | 2009-07-29 | 中国石化股份胜利油田分公司胜利采油厂 | Borehole log wellhead double-sealing blowout preventer |
| CN201786307U (en) * | 2010-07-30 | 2011-04-06 | 西安庆油石化科技装备有限公司 | High-pressure double-stage blowout prevention self-adjusting polished rod sealer |
| CN201943646U (en) * | 2010-12-22 | 2011-08-24 | 中国石油天然气集团公司 | Two-stage blowout prevention tool for oil well |
| CN202990935U (en) * | 2012-11-07 | 2013-06-12 | 宝鸡瑞林石油机电设备有限责任公司 | Pilot-operated two stage well testing blowout control box |
-
2012
- 2012-11-07 CN CN201210441937.3A patent/CN102996092B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2695617Y (en) * | 2004-04-09 | 2005-04-27 | 项振生 | Casing pump bouble-stage pneumatic anti-blowout box for oil production |
| CN200985762Y (en) * | 2006-09-30 | 2007-12-05 | 侯宁 | Blowout prevention double stage polish rod sealer |
| CN201041011Y (en) * | 2007-05-08 | 2008-03-26 | 赵战中 | Multifunctional polish rod sealing device |
| CN201280908Y (en) * | 2008-11-07 | 2009-07-29 | 中国石化股份胜利油田分公司胜利采油厂 | Borehole log wellhead double-sealing blowout preventer |
| CN201786307U (en) * | 2010-07-30 | 2011-04-06 | 西安庆油石化科技装备有限公司 | High-pressure double-stage blowout prevention self-adjusting polished rod sealer |
| CN201943646U (en) * | 2010-12-22 | 2011-08-24 | 中国石油天然气集团公司 | Two-stage blowout prevention tool for oil well |
| CN202990935U (en) * | 2012-11-07 | 2013-06-12 | 宝鸡瑞林石油机电设备有限责任公司 | Pilot-operated two stage well testing blowout control box |
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| CN102996092A (en) | 2013-03-27 |
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