CN110195575B - Hydraulic control multi-time switching stratum pollution prevention valve - Google Patents
Hydraulic control multi-time switching stratum pollution prevention valve Download PDFInfo
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- CN110195575B CN110195575B CN201910366878.XA CN201910366878A CN110195575B CN 110195575 B CN110195575 B CN 110195575B CN 201910366878 A CN201910366878 A CN 201910366878A CN 110195575 B CN110195575 B CN 110195575B
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- 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
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- 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
- E21B34/102—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole with means for locking the closing element in open or closed position
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a hydraulic control stratum pollution prevention valve capable of being opened and closed for multiple times, which comprises an outer cylinder, a pontoon hydraulic cylinder, a piston rod and a piston cylinder; the two ends of the outer cylinder are respectively connected with an upper joint and a lower joint and are in threaded connection; one end of the lower connector embedded in the outer cylinder is of a boss structure; the lower end of the piston rod is sleeved with the inner end of the lower joint boss structure; the piston cylinder sleeve is arranged outside the piston rod and is connected with the outer end thread of the lower joint boss structure; the pontoon hydraulic cylinder is positioned in the outer cylinder, and the bottom end of the pontoon hydraulic cylinder is provided with an open slot in a surrounding manner and is connected with the upper end thread of the piston cylinder. Compared with the prior art, the invention has the beneficial effects that: greatly reduces the production cost and the exploitation working period, obviously improves the exploitation effect of oil gas, and has stable equipment structure and good operability.
Description
Technical Field
The invention relates to the field of stratum leakage prevention valves, in particular to a stratum pollution prevention valve which can be opened and closed for multiple times by hydraulic control.
Background
With the continuous progress and development of oilfield development technology, it is generally considered in the industry that minimizing pollution to the stratum is an important factor in improving productivity and life span of an oilfield. In particular to an oil well which has high permeability and weaker stratum cementation and is easy to sand. Tight control of the well fluid throughout the production cycle must be ensured, otherwise the production cycle and production of the hydrocarbon well would be greatly compromised.
The stratum leakage prevention valves used at present are mainly valve plate type stratum leakage prevention valves, ball valve type stratum leakage prevention valves and the like. However, the above-mentioned several forms of stratum leakage-proof valves can only solve part of the problems, and with the continuous update and continuous improvement of the requirements of the oil and gas well development technology, the above products have not met the current demands for stratum protection. Whether it is a valve plate type anti-stratum leakage valve or a ball valve type anti-stratum leakage valve, the anti-stratum leakage valve can only realize the downward anti-leakage function of liquid in a shaft. However, in field applications, particularly in the production of oil and gas fields, well bore acidizing and well flushing operations are also required to achieve plugging removal and stimulation of oil and gas wells. If the old valve plate type stratum leakage prevention valve or the ball valve type stratum leakage prevention valve is adopted, well repair operation is needed, a well mouth is disassembled, a matched opening and closing tool is put into the well mouth, and the valve plate type stratum leakage prevention valve or the ball valve type stratum leakage prevention valve is opened or closed.
In this way, there are many problems that, first, if the well repair operation is performed, the production of the oil well must be stopped, and the wellhead needs to be removed, so that the production cost of the oil and gas well is greatly increased. And after the switch tool with a mechanical structure is put in, the problem that the valve plate type or ball valve cannot be completely closed again after the stratum leakage prevention valve is opened can exist. If the problem occurs, the stratum leakage prevention valve completely loses the functionality, and in the process of opening and closing the stratum leakage prevention valve, a large amount of completion fluid can enter the stratum, so that irreversible pollution and blockage of the stratum are caused, and the stratum leakage prevention valve is extremely unfavorable for the production of a later-stage oil and gas well.
In view of the foregoing, there is a need for a system that can perform the functions of an anti-fouling valve of a formation during the production process, and that can perform the operations of acidizing and backwashing the formation without any additional tools. And the whole tool is required to be opened and closed for multiple times in the whole production period of the oil and gas well, and the problems of functions and reliability of the anti-fouling valve are comprehensively solved through the innovative design of a mechanical structure.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide the hydraulic control multi-time switching stratum pollution prevention valve which has the advantages of greatly reducing the production cost and the exploitation working period, remarkably improving the exploitation effect of oil gas, along with stable equipment structure and good operability.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a hydraulic control stratum pollution prevention valve capable of being opened and closed for multiple times comprises an outer cylinder, a pontoon hydraulic cylinder, a piston rod and a piston cylinder; the two ends of the outer cylinder are respectively connected with an upper joint and a lower joint and are in threaded connection; one end of the lower connector embedded in the outer cylinder is of a boss structure; the lower end of the piston rod is sleeved with the inner end of the lower joint boss structure; the piston cylinder sleeve is arranged outside the piston rod and is connected with the outer end thread of the lower joint boss structure; the pontoon hydraulic cylinder is positioned in the outer cylinder, and the bottom end of the pontoon hydraulic cylinder is provided with an open slot in a surrounding manner and is connected with the upper end thread of the piston cylinder. The mode of threaded connection is integrally adopted in the structure, so that the installation difficulty is reduced, and the assembly efficiency is improved.
As optimization, an upper polishing sealing cavity and a lower polishing sealing cavity are arranged in the pontoon hydraulic cylinder; an upper pontoon is arranged in the upper polishing sealing cavity, and a lower pontoon is arranged in the lower polishing sealing cavity; a limiting sleeve is arranged in the bottom end of the lower pontoon; the limit sleeve is connected with the bottom end thread of the lower pontoon, and a damping spring is sleeved outside the limit sleeve.
As optimization, the upper pontoon is in a T-shaped structure; the lower pontoon is of a Y-shaped structure; the upper polishing sealing cavity is matched with the T-shaped structure of the upper pontoon; the lower polishing sealing cavity is matched with the Y-shaped structure of the lower pontoon. The structural design of the upper pontoon and the lower pontoon is improved, so that the upper pontoon and the lower pontoon are more stable when moving in the upper polishing sealing cavity and the lower polishing sealing cavity.
As optimization, a pontoon spring is arranged between the upper pontoon and the lower pontoon. The floating barrel spring is used for achieving a linkage effect.
As optimization, the top end of the piston rod is provided with a ball seat sealing groove, the middle part is provided with a liquid communication hole, and the bottom end is provided with an elastic locking claw; a steel ball is arranged in the ball seat sealing groove; sliding sealing grooves are formed in two sides of the liquid communication hole; an O-shaped sealing ring is arranged in the sliding sealing groove. The sealing fit is realized through the movement of the steel ball, and the characteristics of hydraulic pressure and vacuum are utilized.
As optimization, a locking groove matched with the elastic locking claw structure is arranged in the lower joint; the cross section of the locking groove is of a triangular structure, and two corners at the bottom end of the locking groove are acute angles. The locking and the releasing of the piston rod are realized through the elastic locking claw, and meanwhile, the locking and the releasing are more convenient due to the optimized structure.
As optimization, a groove is formed in the side end of the piston cylinder, and a ceramic water nozzle is clamped and embedded in the groove; the ceramic water nozzle is externally provided with a fixing cap. The ceramic water nozzle is adopted to prevent the water nozzle from scaling in the pit, and meanwhile, the size of the ceramic water nozzle hole can be adjusted according to the requirements by adopting the connecting mode, so that different throttling pressures are generated, and the pressure control is realized.
As optimization, the lower end of the piston rod is provided with an annular groove, a reset spring is arranged in the annular groove, and the inner end of the piston cylinder corresponding to the annular groove is provided with a thread structure. The size of the resilience force of the return spring is adjusted through the thread structures of the return spring and the piston cylinder, so that the controllable operation of the pressure of the anti-pollution valve is realized.
As optimization, O-shaped sealing rings are arranged between the upper connector and the outer cylinder, between the lower connector and the piston rod, between the pontoon hydraulic cylinder and the lower pontoon, and between the pontoon hydraulic cylinder and the upper pontoon. Through the seal design of each structure junction, guarantee device overall structure's stability.
Compared with the prior art, the invention has the beneficial effects that: the structural design of the upper pontoon and the lower pontoon is optimized, the benefits in oil and gas exploitation are greatly improved by means of the characteristics of hydraulic pressure and vacuum, and the cost is reduced; the structural design of the water nozzle is improved, the scaling problem of the water nozzle is solved while the use effect is met, and meanwhile, the size variability of the water nozzle holes is realized by adopting the split structural design, so that the pressure controllability is realized; the use reliability of the anti-fouling valve is greatly improved by utilizing the locking and releasing of the elastic locking claw on the piston rod; the size of the resilience force of the return spring is adjusted by utilizing the thread structures of the return spring and the piston cylinder, so that the controllable operation of the pressure of the anti-pollution valve is realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of a pontoon hydraulic cylinder structure according to the invention.
Fig. 3 is a schematic view of the piston rod structure of the present invention.
Wherein, upper joint 1, upper pontoon 2, urceolus 3, pontoon hydraulic cylinder 4, pontoon spring 5, lower pontoon 6, stop collar 7, damping spring 8, steel ball 9, piston rod 10, piston cylinder 11, ceramic water nozzle 12, fixed cap 13, reset spring 14, lower joint 15, "O" shape sealing washer 16, upper polish seal cavity 401, lower polish seal cavity 402, open slot 403, ball seat seal groove 1001, liquid communication hole 1002, sliding seal slot 1003, elastic locking claw 1004.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following detailed description is presented in connection with the accompanying drawings: a hydraulic control stratum pollution prevention valve capable of being opened and closed for multiple times comprises an outer cylinder 3, a pontoon hydraulic cylinder 4, a piston rod 10 and a piston cylinder 11; the two ends of the outer cylinder 3 are respectively connected with an upper joint 1 and a lower joint 15 and are in threaded connection; one end of the lower joint 15 embedded in the outer cylinder 3 is of a boss structure; the lower end of the piston rod 10 is sleeved with the inner end of a boss structure of the lower joint 15; the piston cylinder 11 is sleeved outside the piston rod 10 and is connected with the outer end thread of the boss structure of the lower joint 15; the pontoon hydraulic cylinder 4 is positioned in the outer cylinder 3, and the bottom end of the pontoon hydraulic cylinder is provided with an open groove 403 in a surrounding manner and is connected with the upper end of the piston cylinder 11 in a threaded manner. The mode of threaded connection is integrally adopted in the structure, so that the installation difficulty is reduced, and the assembly efficiency is improved.
An upper polishing sealing cavity 401 and a lower polishing sealing cavity 402 are arranged in the pontoon hydraulic cylinder 4; an upper pontoon 2 is arranged in the upper polishing sealing cavity, and a lower pontoon 6 is arranged in the lower polishing sealing cavity; a limiting sleeve 7 is arranged in the bottom end of the lower pontoon 6; the limit sleeve 7 is connected with the bottom end thread of the lower pontoon 6, and a damping spring 8 is sleeved outside the limit sleeve. The upper pontoon 2 is of a T-shaped structure; the lower pontoon 6 is of a Y-shaped structure; the upper polishing sealing cavity 401 is matched with the T-shaped structure of the upper pontoon 2; the lower polish seal cavity 402 mates with the "Y" shaped structure of the lower pontoon 6. The structural design of the upper and lower pontoons is improved so that the upper and lower pontoons are more stable when moving in the upper and lower polishing seal cavities 401 and 402. A pontoon spring 5 is arranged between the upper pontoon 2 and the lower pontoon 6. The linkage effect is achieved through the pontoon springs 5.
The top end of the piston rod 10 is provided with a ball seat sealing groove 1001, the middle part is provided with a liquid communication hole 1002, and the bottom end is provided with an elastic locking claw 1004; a steel ball 9 is arranged in the ball seat seal groove 1001; sliding seal grooves 1003 are formed on both sides of the liquid communication hole 1002; an O-shaped sealing ring 16 is arranged in the sliding sealing groove 1003. The sealing fit is realized through the movement of the steel ball, and the characteristics of hydraulic pressure and vacuum are utilized.
A locking groove matched with the structure of the elastic locking claw 1004 is arranged in the lower joint 15; the cross section of the locking groove is of a triangular structure, and two corners at the bottom end of the locking groove are acute angles. The locking and releasing of the piston rod 11 is achieved by means of the elastic locking pawl, while the structure is optimized for a more convenient locking and releasing.
A groove is formed in the side end of the piston cylinder 11, and a ceramic water nozzle 12 is embedded in the groove; the ceramic water nozzle 12 is externally provided with a fixing cap 13. The ceramic water nozzle is adopted to prevent the water nozzle from scaling in the pit, and meanwhile, the size of the ceramic water nozzle hole can be adjusted according to the requirements by adopting the connecting mode, so that different throttling pressures are generated, and the pressure control is realized.
The lower end of the piston rod 10 is provided with an annular groove, a return spring 14 is arranged in the annular groove, and the inner end of the piston cylinder 11 corresponding to the annular groove is provided with a thread structure. The size of the rebound force of the return spring 14 is adjusted by the thread structures of the return spring 14 and the piston cylinder, so that the controllable operation of the pressure of the pollution-proof valve is realized.
O-shaped sealing rings 16 are respectively arranged between the upper connector 1 and the outer cylinder 3, between the lower connector 15 and the piston rod 10, between the pontoon hydraulic cylinder 4 and the lower pontoon 6 and between the pontoon hydraulic cylinder 4 and the upper pontoon 2. Through the seal design of each structure junction, guarantee device overall structure's stability.
The specific embodiment and the working principle are as follows:
The invention can realize two running modes, namely, running together with an upper well completion tool such as an electric submersible pump and the like and running independently. When the production positioning sealing rod is put down together with an upper well completion tool such as an electric submersible pump, the production positioning sealing rod is connected to the lowest end of the production string, and the production positioning sealing rod is inserted into a central tube sealing cylinder of a packer at the top of the lower well completion string.
When the sealing rod is independently put down, the sealing rod is connected and fed into the guiding tool at the upper part of the sealing rod, and the positioning sealing rod is connected and produced at the lower part of the sealing rod. And (3) feeding the production positioning sealing rod into a top packer central tube sealing cylinder of the lower well completion string after the string reaches the designed position by using the oil pipe. Thereby realizing the installation of the present invention.
When the oil gas well is normally produced, the oil gas flow enters the device from the lower joint 15, the steel ball 9 is jacked up through the central cavity of the piston rod 10, enters the lower pontoon 6, enters the annular space between the pontoon hydraulic cylinder 4 and the outer barrel 3 through the opening groove 403 of the lower pontoon 6, and then enters the production pipe column, so that the normal production of the oil gas well is realized.
When the acidification or backwashing operation is needed, acid liquor is injected from a wellhead wing valve, enters a production pipe column, and then enters the device from an upper joint 1. The acid liquid applies pressure to the upper buoy 2 to provide a downward force, while the acid liquid pressure acts on the sealing surface formed by the ball 9 and the ball seat seal groove 1001 of the piston rod 10 to provide another downward force. The superposition of the two acting forces overcomes the upward acting force of the lower pontoon 6 and the upward acting forces of the pontoon springs 5 and the damping springs 8. Thereby pushing the piston rod 10 to move downward, and when the liquid communication hole 1002 of the piston rod 10 is aligned with the ceramic water nozzle 12 of the piston cylinder 11, the acid liquid can enter the central cavity of the piston rod 10 through the ceramic water nozzle 12 and the liquid communication hole 1002, thereby entering the stratum downward. At the same time, the elastic locking pawl 1004 of the piston rod 10 will be locked in the locking groove of the lower joint 15, ensuring that the whole acidification process is always in an open state.
When the acidification operation is completed, the effect of acid hydraulic pressure is lost. At this time, the upper pontoon 2 and the lower pontoon 6 of the anti-fouling valve are respectively subjected to the formation hydrostatic column pressure, which acts on the lower pontoon 6, thereby providing an upward force. At this time, the upward force of the lower pontoon 6 and the upward force of the return spring 5 are superimposed, so that the downward force of the upper pontoon 2 and the locking force of the elastic locking claw 1004 can be overcome. At this time, the piston rod 10 moves upward, thereby achieving the resetting of the device.
The above embodiments are merely specific examples of the present invention, and the scope of the present invention includes, but is not limited to, the product forms and styles of the above embodiments, any hydraulic control device capable of opening and closing the formation contamination prevention valve multiple times according to the claims of the present invention and any suitable changes or modifications made by those skilled in the art shall fall within the scope of the present invention.
Claims (3)
1. An anti-pollution valve capable of being opened and closed for a plurality of times by hydraulic control, which is characterized in that: comprises an outer cylinder (3), a pontoon hydraulic cylinder (4), a piston rod (10) and a piston cylinder (11); the two ends of the outer cylinder (3) are respectively connected with an upper joint (1) and a lower joint (15) and are in threaded connection; one end of the lower joint (15) embedded in the outer cylinder (3) is of a boss structure; the lower end of the piston rod (10) is sleeved with the inner end of a boss structure of the lower joint (15); the piston cylinder (11) is sleeved outside the piston rod (10) and is connected with the outer end thread of the boss structure of the lower joint (15); the pontoon hydraulic cylinder (4) is positioned in the outer cylinder (3), and the bottom end of the pontoon hydraulic cylinder is provided with an open slot (403) in a surrounding manner and is connected with the upper end of the piston cylinder (11) through threads;
An upper polishing sealing cavity (401) and a lower polishing sealing cavity (402) are arranged in the pontoon hydraulic cylinder (4); an upper pontoon (2) is arranged in the upper polishing sealing cavity, and a lower pontoon (6) is arranged in the lower polishing sealing cavity; a limiting sleeve (7) is arranged in the bottom end of the lower pontoon (6); the limit sleeve (7) is connected with the bottom end thread of the lower pontoon (6), and a damping spring (8) is sleeved outside the limit sleeve;
The upper pontoon (2) is of a T-shaped structure; the lower pontoon (6) is in a Y-shaped structure; the upper polishing sealing cavity (401) is matched with the T-shaped structure of the upper pontoon (2); the lower polishing sealing cavity (402) is matched with the Y-shaped structure of the lower pontoon (6);
The top end of the piston rod (10) is provided with a ball seat sealing groove (1001), the middle part is provided with a liquid communication hole (1002), and the bottom end is provided with an elastic locking claw (1004); a steel ball (9) is arranged in the ball seat sealing groove (1001); sliding sealing grooves (1003) are formed on both sides of the liquid communication hole (1002); an O-shaped sealing ring (16) is arranged in the sliding sealing groove (1003);
a locking groove matched with the structure of the elastic locking claw (1004) is arranged in the lower joint (15); the cross section of the locking groove is of a triangular structure, and two corners at the bottom end of the locking groove are acute angles;
a groove is formed in the side end of the piston cylinder (11), and a ceramic water nozzle (12) is embedded in the groove; a fixing cap (13) is additionally arranged outside the ceramic water nozzle (12);
the lower end of the piston rod (10) is provided with an annular groove, a return spring (14) is arranged in the annular groove, and the inner end of the piston cylinder (11) corresponding to the annular groove is provided with a thread structure.
2. A hydraulically controlled contamination valve for multiple switching of a formation according to claim 1, wherein: a pontoon spring (5) is arranged between the upper pontoon (2) and the lower pontoon (6).
3. A hydraulically controlled contamination valve for multiple switching of a formation according to claim 1, wherein: an O-shaped sealing ring (16) is arranged between the upper connector (1) and the outer cylinder (3), between the lower connector (15) and the piston rod (10), between the pontoon hydraulic cylinder (4) and the lower pontoon (6) and between the pontoon hydraulic cylinder (4) and the upper pontoon (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910366878.XA CN110195575B (en) | 2019-05-05 | 2019-05-05 | Hydraulic control multi-time switching stratum pollution prevention valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910366878.XA CN110195575B (en) | 2019-05-05 | 2019-05-05 | Hydraulic control multi-time switching stratum pollution prevention valve |
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| Publication Number | Publication Date |
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| CN110195575A CN110195575A (en) | 2019-09-03 |
| CN110195575B true CN110195575B (en) | 2024-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910366878.XA Active CN110195575B (en) | 2019-05-05 | 2019-05-05 | Hydraulic control multi-time switching stratum pollution prevention valve |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078790U (en) * | 1990-11-20 | 1991-06-12 | 辽河石油勘探局茨榆坨采油厂 | Self-opening drainage, hot-cleaning circulation valve |
| CN201068781Y (en) * | 2007-02-14 | 2008-06-04 | 中国石化集团胜利石油管理局井下作业公司 | Down-hole fixed pressure opening valve for injection, extraction and washing |
| CN103075125A (en) * | 2011-10-25 | 2013-05-01 | 中国石油化工股份有限公司 | Pressure balancing device |
| CN209990477U (en) * | 2019-05-05 | 2020-01-24 | 天津凯雷油田技术有限公司 | Hydraulically controlled stratum anti-pollution valve capable of being opened and closed repeatedly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6209663B1 (en) * | 1998-05-18 | 2001-04-03 | David G. Hosie | Underbalanced drill string deployment valve method and apparatus |
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2019
- 2019-05-05 CN CN201910366878.XA patent/CN110195575B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078790U (en) * | 1990-11-20 | 1991-06-12 | 辽河石油勘探局茨榆坨采油厂 | Self-opening drainage, hot-cleaning circulation valve |
| CN201068781Y (en) * | 2007-02-14 | 2008-06-04 | 中国石化集团胜利石油管理局井下作业公司 | Down-hole fixed pressure opening valve for injection, extraction and washing |
| CN103075125A (en) * | 2011-10-25 | 2013-05-01 | 中国石油化工股份有限公司 | Pressure balancing device |
| CN209990477U (en) * | 2019-05-05 | 2020-01-24 | 天津凯雷油田技术有限公司 | Hydraulically controlled stratum anti-pollution valve capable of being opened and closed repeatedly |
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| CN110195575A (en) | 2019-09-03 |
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