CN114622864A - Continuous circulating valve suitable for inflation drilling, drilling system and process - Google Patents
Continuous circulating valve suitable for inflation drilling, drilling system and process Download PDFInfo
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- CN114622864A CN114622864A CN202111296333.XA CN202111296333A CN114622864A CN 114622864 A CN114622864 A CN 114622864A CN 202111296333 A CN202111296333 A CN 202111296333A CN 114622864 A CN114622864 A CN 114622864A
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- 238000005553 drilling Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 56
- 230000009471 action Effects 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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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
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
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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
- E21B7/00—Special methods or apparatus for drilling
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Abstract
The invention provides a continuous circulating valve suitable for inflation drilling, a drilling system and a process, and relates to the technical field of inflation drilling. The continuous circulation valve includes a valve body having a central passage, a main valve disposed within an upper end of the valve body, and a side valve disposed at a side of the valve body. The main valve is a plug valve coaxially arranged with the valve body and comprises a ball valve, an upper valve seat, a lower valve seat, a clamping ring, a first retainer ring, a retaining ring, a first sealing element and a second sealing element. The upper valve seat is provided with a first sealing position, a first limiting part and a lower end inner spherical surface. One end of the clamping ring is embedded into the valve body, and the other end of the clamping ring is contacted with the upper valve seat. One end of the baffle ring is embedded into the valve body, and the other end of the baffle ring is arranged in the first limiting part. The first retainer ring is arranged in the retainer ring. The lower valve seat is provided with a second limiting part, a second sealing position and an upper end inner spherical surface, and the second limiting part is embedded into the valve body. The beneficial effects of the invention can include: the main valve is switched on and off manually, so that the problem that the main valve of the continuous circulating valve in the prior art is not closed tightly or damaged seriously is solved.
Description
Technical Field
The invention relates to the technical field of inflation drilling, in particular to a continuous circulating valve for inflation drilling technology, a valve type continuous circulating gas drilling system comprising the continuous circulating valve and a valve type continuous circulating gas drilling process.
Background
The well leakage is always the biggest bottleneck restricting the drilling development speed, the inflation drilling technology can reduce the drilling cost, solve the problem of stratum leakage, improve the drilling speed, and can further reduce the density of the drilling fluid by reasonably adjusting the liquid-gas ratio, thereby achieving the purpose of reducing the effective liquid column pressure. The gas-filled drilling technology can not only discover and protect oil-gas layers in time, but also improve the mechanical drilling speed, and solve the underground complex problem caused by lost circulation. However, due to the fact that a large amount of injected gas is mixed in the drilling fluid through the gas-filled drilling technology, the gas is distributed unevenly in a shaft, and after circulation is stopped, the gas and the liquid are not uniformly returned due to gas slip, so that the liquid level of the circulation tank can fluctuate greatly, and further whether the stratum is gas or not can not be judged through liquid level change, and well control risks are increased. In conclusion, the gas-filled drilling technology has the defects of large pressure fluctuation during the reconstruction of circulation and no benefit for maintaining the pressure stability of the borehole, and increases the risks of circulation loss, formation fracture, well kick, differential pressure sticking and the like. By adopting the continuous circulation gas-filled drilling technology, the continuous circulation of the slurry can be realized, the pressure stability of the well hole is kept, and the risks of circulation loss, stratum fracture, well kick, differential pressure drill sticking and the like are reduced.
Chinese patent publication No. CN103032040A discloses a continuous circulation short circuit suitable for air drilling, which comprises a short circuit main body (1), a central one-way valve (2) and a lateral vertical one-way valve (3), wherein the central one-way valve (2) comprises a valve body a (6) and a valve plate a (7), the lateral vertical one-way valve (3) comprises a valve body B (9) and a valve plate B (10), a sealing portion a is arranged on a portion of the valve plate a (7) located on an annular sealing surface, a sealing fitting portion a matched with the sealing portion a is arranged on a portion of the valve body a (6) located on the annular sealing surface, a sealing portion B is arranged on a portion of the valve plate B (12) located on the annular sealing surface, and a sealing fitting portion B matched with the sealing portion B is arranged on a portion of the annular sealing surface of the valve body B (11). The valve plate can improve the sealing performance of the valve plate in a multi-stage sealing mode, but is not suitable for pneumatic drilling. At present, a conventional continuous circulating valve is only suitable for air drilling or mud drilling, but not suitable for inflation drilling, when continuous circulation tripping is adopted, after forward circulation and reverse circulation, the problems that a main valve is not closed tightly and cannot be broken out, a continuous circulation tripping process cannot be implemented and the like easily occur, and the defects are particularly prominent in the inflation drilling process.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, when the two main valves are not closed tightly due to leakage during the disassembly of the drill string in the pneumatic drilling process, the pressure in the drilling tool cannot be discharged, and the continuous circulation process cannot be implemented.
To achieve the above object, an aspect of the present invention provides a continuous circulation valve suitable for gas-filled drilling. The continuous circulation valve includes a valve body having a central passage, a main valve disposed within an upper end of the valve body, and a side valve disposed at a side of the valve body. The main valve is the plug valve of arranging with the valve body is coaxial, the main valve includes ball valve, last valve seat, lower disk seat, snap ring, first retainer ring, fender ring, first sealing member and second sealing member. The upper valve seat is provided with a first sealing position with the diameter being reduced inwards and a first limiting part with the diameter being reduced inwards, the lower end face of the upper valve seat is further provided with a lower end inner spherical surface matched with the surface of the ball valve, and the upper valve seat is in contact with the ball valve through the lower end inner spherical surface. One end of the clamping ring is embedded into the valve body, and the other end of the clamping ring is in contact with the upper end of the upper valve seat. The first sealing element is arranged at a first sealing position, one end of the baffle ring is embedded into the valve body, and the other end of the baffle ring is arranged into the first limiting part. First retaining ring sets up in the retaining ring, the lower extreme of first retaining ring and the upper end contact of last disk seat. The lower valve seat is provided with a second limiting part with the diameter increasing outwards and a second sealing position with the diameter decreasing inwards. The second limiting part is embedded into the valve body. The second seal is disposed in the second seal position. The upper end surface of the lower valve seat is also provided with an upper end inner spherical surface matched with the surface of the ball valve, and the lower valve seat is contacted with the ball valve through the upper end inner spherical surface.
Another aspect of the invention provides a valve continuous circulation gas drilling system comprising a continuous circulation valve as described above, a side valve input line, a main valve input line and a control system. The side valve input line is connected to the side valve to inject circulating medium into the central channel through the side valve. The main valve input pipeline is connected with the central channel of the valve body and can inject a circulating medium into the central channel. The control system is used for controlling the opening and closing of a main cycle and a side cycle, wherein in the main cycle, a main valve is opened, a side valve is closed, a circulating medium is injected into the central channel through a main valve input pipeline, in the side cycle, the main valve is closed, the side valve is opened, and the circulating medium is injected into the central channel through a side valve input pipeline.
In a further aspect of the invention, there is provided a valve type continuous circulation gas drilling process, wherein the process is implemented by using a valve type continuous circulation gas drilling system as described above, the process comprising one or more of drilling, drill string connecting, drill tripping and drill string disconnecting actions, wherein the continuous circulation valve is pre-connected to the drill string, and during the drilling action, the continuous circulation valve is in the main circulation; the drill string receiving operation comprises the following actions of sequentially switching the Nth drill string into a side circulation, connecting the (N + 1) th drill string, starting a main circulation of the (N + 1) th drill string and switching the drill string and the Nth drill string into a main circulation; during a tripping action, the continuous circulation valve is in a main circulation; the drill string unloading operation comprises the following actions which are carried out in sequence, namely, taking out the Mth drill string and the continuous circulation valve part of the Mth drill string, switching the Mth drill string to a side circulation and closing a main circulation of the Mth drill string, unloading the Mth drill string, and switching the Mth drill string to the side circulation; the switching to the side circulation action comprises the steps of sequentially opening a side valve and connecting a side valve input pipeline, controlling to open the side circulation and close the main circulation by using a control system, closing a main valve and detaching the main valve input pipeline; the switching to the main cycle comprises sequentially opening the main valve and connecting the main valve input line, using the control system to control the opening of the main cycle and the closing of the side cycle, closing the side valve and removing the side valve input line.
Compared with the prior art, the invention has the following beneficial effects: the main valve can be actively switched on and switched off; by means such as inclinometers after the main valve is opened; the main valve can be ensured to be tightly closed; the continuous circulating gas-filled well drilling can be realized, and the stability of a well bore is favorably kept.
Drawings
FIG. 1 illustrates a cross-sectional view of a continuous circulation valve suitable for use in gas-filled drilling in an exemplary embodiment of the invention;
FIG. 2 illustrates a cross-sectional view of the ball valve in an exemplary embodiment of the invention;
fig. 3 illustrates a cross-sectional view of the lateral stand-off check valve in an exemplary embodiment of the invention.
The mark in the figure is:
1-valve body, 2-main valve, 3-side valve, 4-ball valve, 5-upper valve seat, 6-lower valve seat, 7-snap ring, 8-first retainer ring, 9-retainer ring, 10-first sealing element, 11-second sealing element, 12-third sealing element, 13-elastic element, 14-second retainer ring, 15-stop block, 16-knob, 17-pull block, 18-third sealing ring, 19-valve seat, 20-valve plate, 21-rotating shaft, 22-torsion spring, 23-cover plate, 24-valve core, 25-leakage observation valve and 26-drainage hole.
Detailed Description
Hereinafter, a continuous circulation valve suitable for gas-filled drilling of the present invention will be described in detail with reference to the exemplary embodiments and the accompanying drawings. Herein, unless otherwise specified, "first," "second," "third," etc. are merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance or a strict order of magnitude.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The applicant finds that the valve plates have the problems of poor closing, serious damage and the like in the use process of the conventional continuous circulating valve, and the conventional continuous circulating valve cannot realize the continuous circulating drilling of the inflation drilling. The applicant has made a great deal of practice and summary, finding the reason for this: the main valve of the conventional continuous circulation valve mainly adopts a plate type main valve or an arrow type main valve, and the two main valves are of an automatic sealing type and are communicated in a single direction. When the conventional continuous circulating valve is adopted for tripping, after the forward circulation and the reverse circulation, the pressure of a liquid column exists in a tripping drill string, so that a main valve is not closed tightly and cannot be tripped out. When the main valve is punctured and closed untight when the drill string is disassembled in the inflating drilling process, the pressure in the drilling tool cannot be discharged, so that the continuous circulating tripping process cannot be implemented.
Therefore, the continuous circulating valve suitable for inflating and drilling is provided in one aspect of the disclosure, so as to solve the problems that the main valve of the continuous circulating valve in the prior art is not closed tightly, is damaged seriously, and cannot inflate and drill continuously and circularly.
As shown in fig. 1, the continuous circulation valve according to the exemplary embodiment of the present invention includes a valve body 1 having a central passage, a main valve 2 disposed at an upper end of the central passage of the valve body 1, and a side valve 3 disposed at a side of the valve body 1 and communicating with the central passage of the valve body 1.
The main valve 2 may be a plug valve arranged coaxially with the valve body 1. The main valve 2 may comprise a ball valve 4, an upper valve seat 5, a lower valve seat 6, a snap ring 7, a first retainer ring 8, a retainer ring 9, a first seal 10 and a second seal 11.
The upper valve seat 5 may have a first sealing position with an inwardly decreasing diameter and a first stopper portion with an inwardly decreasing diameter.
The first seal 10 may be provided at a first seal position capable of sealing a gap between the upper valve seat 5 and the valve body 1, and for example, an O-ring may be provided as the first seal 10 at the first seal position. Further, the first sealing element 10 may be a combination in which a sealing ring is tightly attached to an O-ring, which can achieve a better sealing effect.
One end of the snap ring 7 is embedded into the inner wall of the valve body 1, and the other end of the snap ring is in contact with the upper end face of the upper valve seat 5, so that the upward movement of the upper valve seat 5 is limited.
One end of the baffle ring 9 is embedded into the inner wall of the valve body 1, and the other end of the baffle ring is embedded into the first limiting part of the upper valve seat 5, so that the effect of limiting the downward movement of the upper valve seat 5 is achieved.
The upper valve seat 5 may have a lower end inner spherical surface matched with the surface of the ball valve 4, and the upper valve seat 5 is in contact with the ball valve 4 through the lower end inner spherical surface thereof.
The first collar 8 is arranged in the collar 9, for example against the inner wall of the collar 9. The lower end surface of the first retainer ring 8 is in contact with the upper end surface of the upper valve seat 5, and can play a role in further limiting the upward movement of the upper valve seat 5. Further, a second retainer ring 14 may be disposed on an inner wall of the retainer ring 9, and the second retainer ring 14 is located above the first retainer ring 8, for example, the second retainer ring 14 may be a circlip for hole, and is tightly attached to or embedded in the inner wall of the retainer ring 9, and contacts with an upper end surface of the first retainer ring 8, so as to further limit, fix, and seal the upper valve seat 5.
The lower valve seat 6 is provided with a second limiting part and a second sealing position, the diameter of the second limiting part is outwards increased, the second limiting part is inwards reduced, the second limiting part is embedded into the valve body 1 and is matched with the valve body 1 to further limit the lower valve seat 6 to move up and down. Further, an elastic member 13 may be provided on the lower valve seat 6, for example, a spring may be provided as the elastic member 13 embedded in the valve body 1 and in contact with the lower end surface of the second stopper portion, so that vibration can be reduced when the movement of the lower valve seat 6 is restricted.
The second seal 11 is provided at a second seal position capable of sealing a gap between the lower valve seat 6 and the valve body 1, and for example, an O-ring is provided as the second seal 11 at the second seal position. Further, the second sealing member 11 may be a combination of a sealing ring closely attached to an O-ring, which can achieve a better sealing effect.
The lower valve seat 6 also has an upper end inner spherical surface that matches the surface of the ball valve 4, and the lower valve seat 6 is in contact with the ball valve 4 through its upper end inner spherical surface.
The main valve 2 (namely the plug valve) realizes the opening and closing of the ball valve 4 through a ball core switch. As shown in fig. 1 and 2, the ball valve 4 is in an open state, and the ball core switch comprises a stop 15, a knob 16 and a pulling block 17.
The main valve 1 may further comprise a third sealing element 12, the third sealing element 12 being fitted over the knob 16 to enable sealing between the ball valve 4 and the valve body 1. For example, an O-ring seal is provided as the third seal member 12. Furthermore, a third sealing ring 18 can be arranged to cling to the O-shaped sealing ring, so that a better sealing effect can be achieved.
The stop block 15 is fixed on the knob 16, the knob 16 is fixed on the shifting block 17, the shifting block 17 is connected with the ball valve 4 and can control the ball valve 4 to rotate to a first position or a second position, and the difference between the first position and the second position is 90 degrees. When the ball valve 4 is rotated to the first position, it is in an open state, i.e., the state shown in fig. 2, and when the ball valve 4 is rotated to the second position, it is in a closed state.
Further, as shown in fig. 1 and 3, the side valve 3 may be a lateral vertical type single valve including a valve seat 19, a valve plate 20, a rotation shaft 21, a torsion spring 22, a valve core 24, and a leakage observing valve 25.
The valve seat 19 has a first through hole that can communicate with the central passage of the valve body 1. The valve seat 19 is mounted on the valve body 1. Valve plate 20 may be hinged to valve seat 19 by a pivot shaft 21. The torsion spring 22 can be sleeved on the rotating shaft 21, one end of the torsion spring 22 is pressed against the valve body 1, and the other end of the torsion spring 22 presses the valve plate 20 against the valve body 1. An annular sealing surface may be formed between valve plate 20 and valve body 1 to seal the connection of side valve 3 to the central passage of valve body 1.
The cover plate 23 may have a second through hole, and the cover plate 23 is screw-mounted on the first through hole of the valve seat 19 and coaxial with the valve seat 19, i.e., the second through hole is coaxial with the first through hole. The second through hole can communicate with the central passage of the valve body 1.
The valve core 24 may have a third through hole, and the valve core 24 is mounted on the second through hole of the cover plate 23 by screw threads and is coaxial with the cover plate 23, that is, the third through hole is coaxial with the second through hole. The third through hole can be communicated with the central channel of the valve body 1, and the valve core 24 is provided with a drain hole 26 which can be communicated with the third through hole and the outside. For example, the drain holes 26 are 3 to 6 through holes uniformly distributed on the valve core 24 in the circumferential direction.
The leakage observing valve 25 is installed in the second through hole of the spool 24 by a screw and is coaxial with the spool 24, and the leakage observing valve 25 can move in the first through hole by a screw to a third position where the leakage observing valve 25 seals the drain hole 26 and a fourth position where the leakage observing valve 25 and the drain hole 26 are not in contact with each other, so that the medium from the hollow passage can be discharged through the drain hole 26.
The continuous circulation valve may further comprise a side valve anti-drop mechanism, which may comprise a pin cover, a first securing pin, and a second securing pin. The pin cover is fastened to the valve body 1 by means of a first fixing pin. The valve seat 19 is fastened to the pin cover by means of a second fastening pin and is connected to the valve body 1. The gap between the first fixing pin and the pin cover is covered by anaerobic adhesive, and the gap between the pin cover and the valve body 1 is covered by anaerobic adhesive.
In another aspect of the invention, a valve continuous circulation gas drilling system is provided that includes a side valve input line, a main valve input line, a control system, and a drill string.
Wherein the drill string is connected with the continuous circulation valve as described above.
A side valve inlet line is connected to the side valve and allows the circulation medium to be injected into the central channel via the side valve.
The main valve input line is connected with the central channel of the valve body and can inject a circulating medium into the central channel.
The control system is used for controlling the opening and closing of the main cycle and the side cycle of the valve type continuous circulation gas drilling system. When the valve type continuous circulation gas drilling system is in a main circulation, the main valve is opened, the side valve is closed, and the circulating medium is injected into the central channel through the input pipeline of the main valve and further injected into the well hole. When the valve type continuous circulation gas drilling system is in side circulation, the main valve is closed, the side valve is opened, and the circulating medium is injected into the central channel through the side valve input pipeline and further injected into the well hole.
A valve-type continuous cycle gas drilling process according to yet another aspect of the present disclosure is described below in conjunction with fig. 1-3, and is implemented using a logging drilling system as described above, and essentially includes the actions of: drilling, connecting a drill string, tripping and disconnecting the drill string.
During the drilling action, the continuous circulating valve is in the main circulation, the central channel of the ball core of the plug valve is opened, the circulating medium is injected into the well through the plug valve of the central channel, and the side valve 3 is closed, namely the valve plate 20 is pressed on the valve body 1 and forms an annular sealing surface.
Before the operation of connecting the drill string, the continuous circulation valve suitable for the gas-filled drilling of the invention is connected to the drill string in advance.
When the drill string is connected for operation, the drill string which enters a well is set as the Nth drill string, the drill string which needs to be connected is the (N + 1) th drill string, and N is a natural number. The drill string tripping operation may include the following actions in sequence: switching the Nth drill string into side circulation, wherein circulation in the well is realized by injecting a circulation medium into the well through a side valve of a continuous circulation valve on the Nth drill string, and the circulation is not stopped, so that the pressure stability of the well is kept; connecting the (N + 1) th drill string; and (3) starting the main circulation of the (N + 1) th drill string and switching the Nth drill string into the main circulation, wherein the circulation in the well is realized by injecting a circulating medium into the well through the hollow channels of the continuous circulating valves on the Nth drill string and the (N + 1) th drill string, the circulation is not stopped, and the pressure stability of the well is kept.
The switching to the side cycle action includes sequentially opening the side valve and connecting the side valve input line, controlling the opening side cycle and closing the main cycle using the control system, closing the main valve and removing the main valve input line. The switching to the main cycle comprises sequentially opening the main valve and connecting the main valve input line, using the control system to control the opening of the main cycle and the closing of the side cycle, closing the side valve and removing the side valve input line.
Further, when the side valve is a lateral vertical single valve, whether the side valve is well sealed can be observed through the leakage observation valve. If the side valve is sealed, the side valve may be depressurized, for example, by unscrewing the side relief valve to vent the pressure therein. If the side valve leaks, circulating medium is discharged from the discharge hole 26, so that an operator can immediately observe the leakage, and the possible damage to people caused by the injection of the circulating medium due to the fact that the pressure of the side valve is directly relieved is avoided.
When the drill string is unloaded, the drill string which is discharged from the well is set as the Mth drill string, the drill string connected below the Mth drill string is the M-1 drill string, and M is more than or equal to 5. The drill string tripping operation comprises the following actions in sequence: removing the continuous circulation valve parts of the Mth drill string and the Mth-1 drill string, wherein the circulation in the well is realized by injecting a circulation medium into the well hole through the hollow channel of the continuous circulation valve on the Mth drill string; switching the M-1 drill strings into side circulation and closing the main circulation of the M drill strings, wherein the circulation in the well is realized by injecting a circulation medium into a hollow channel of a continuous circulation valve through a side valve of the continuous circulation valve on the M-1 drill strings and further injecting the circulation medium into a well hole; unloading the Mth drill string; and switching the M-1 drill string to a main circulation, wherein the circulation in the well is realized by injecting a circulating medium into the borehole through the hollow channel of the continuous circulating valve on the M-1 drill string.
During a tripping action, the continuous circulation valve is in a main circulation.
In the whole process of drilling, connecting a drill string, tripping or disassembling the drill string, the circulation in the well is not stopped all the time, the pressure fluctuation when the circulation is stopped and started for connecting the drill string is eliminated, and the stability of the pressure of the well hole is favorably kept.
In summary, compared with the prior art, the beneficial effects of the invention can include:
(1) the plug valve is of an integrated structure, and has the advantages of simple and compact structure, low manufacturing cost, high strength, good reliability, long service life and easy maintenance;
(2) the main valve is opened and closed manually, is simple to operate and use, can be operated under pressure, and can be opened by tools such as an inclinometer, so that the valve has multiple purposes;
(3) the problem that the main valve of the continuous circulating valve is not closed tightly or damaged seriously in the prior art can be solved;
(4) the side valve can be observed whether to leak before the side circulation is connected, so that the safety of observers is guaranteed;
(5) and the underground accident caused by the falling of the side valve can be avoided.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (10)
1. A continuous circulation valve suitable for use in gas-charged drilling, comprising a main valve having a valve body with a central passage disposed in an upper end of the valve body, and side valves disposed at sides of the valve body,
the main valve is a plug valve which is coaxially arranged with the valve body, the main valve comprises a ball valve, an upper valve seat, a lower valve seat, a clamping ring, a first retainer ring, a retaining ring, a first sealing element and a second sealing element, wherein the upper valve seat is provided with a first sealing position with the diameter inwards reduced and a first limiting part with the diameter inwards reduced, the lower end surface of the upper valve seat is also provided with a lower end inner spherical surface matched with the surface of the ball valve, the upper valve seat is contacted with the ball valve through the lower end inner spherical surface, one end of the clamping ring is embedded into the valve body, the other end of the clamping ring is contacted with the upper end of the upper valve seat, the first sealing element is arranged at the first sealing position, one end of the retaining ring is embedded into the valve body, the other end of the retaining ring is arranged in the retaining ring, the lower end of the first retaining ring is contacted with the upper end of the upper valve seat, the lower valve seat is provided with a second limiting part with the diameter outwards increased and a second sealing position with the diameter inwards reduced, the second limiting part is embedded into the valve body, the second sealing element is arranged at a second sealing position, the upper end face of the lower valve seat is also provided with an upper end inner spherical surface matched with the surface of the ball valve, and the lower valve seat is contacted with the ball valve through the upper end inner spherical surface.
2. The continuous circulation valve adapted for use in gas-filled wells according to claim 1, wherein the plug valve is adapted to open and close the ball valve by means of a core switch comprising a stop, a knob, a pull block and a third seal, wherein the third seal is sleeved on the knob, the stop is fixed on the knob, the knob is fixed on the pull block, the pull block is connected to the ball valve and is adapted to control the ball valve to rotate to a first position or a second position, the first position differs from the second position by 90 °, when the ball valve is rotated to the first position, the ball valve is in an open state, and when the ball valve is rotated to the second position, the ball valve is in a closed state.
3. The continuous circulation valve adapted for use in gas-filled drilling according to claim 1, further comprising a second retainer ring embedded in an inner wall of the retainer ring and abutting above the first retainer ring.
4. The continuous circulation valve adapted for use in gas-filled drilling according to claim 1, further comprising an elastic member disposed below said second retainer portion of the lower valve seat, said elastic member being embedded within the valve body and in end-face contact with both the valve body and said second retainer portion.
5. The continuous circulation valve adapted for use in gas-filled drilling according to claim 1, wherein the first and/or second seal comprises an O-ring seal and a sealing ring, the sealing ring abutting the O-ring seal.
6. The continuous circulation valve adapted for use in gas-filled wells according to claim 1, wherein said side valve is a side-standing one-way valve comprising a valve seat, a valve plate pivot axis torsion spring cover plate cartridge, a leakage observation valve,
the valve seat is provided with a first through hole which can be communicated with a central channel of the valve body, the valve seat is arranged on the valve body, the valve plate is hinged with the valve seat through a rotating shaft, a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is propped against the valve body, the other end of the torsion spring is propped against the valve plate on the valve body, an annular sealing surface can be formed between the valve plate and the valve body,
the cover plate is provided with a second through hole, the cover plate is arranged on the first through hole of the valve seat through threads and is coaxial with the valve seat, the second through hole can be communicated with the central channel of the valve body,
the valve core is provided with a third through hole, the valve core is arranged on the third through hole of the cover plate through threads and is coaxial with the cover plate, the third through hole can be communicated with the central channel of the valve body, the valve core is provided with a drain hole which can be communicated with the third through hole and the outside,
the leakage observation valve is installed on the third through hole of the valve core through threads and is coaxial with the valve core, the leakage observation valve can move to a first position and a second position in the third through hole through threads, the leakage observation valve seals the drain hole, and the leakage observation valve does not contact with the drain hole at the second position, so that a medium of the hollow channel can be discharged through the drain hole.
7. The continuous circulation valve suitable for gas-filled drilling according to claim 6, wherein the drain holes are 3-6 through holes uniformly distributed on the valve core in the circumferential direction.
8. The continuous circulation valve adapted for use in gas-charged drilling according to claim 6, further comprising a side valve anti-drop mechanism comprising a pin cover, a first fixation pin and a second fixation pin,
the pin cover is fastened to the valve body by a first fixing pin,
the valve seat is fastened to the pin cover by a second fixing pin,
the gap between the first fixing pin and the pin cover is covered by anaerobic adhesive, and the gap between the pin cover and the valve body is covered by anaerobic adhesive.
9. A valved continuous circulation gas drilling system comprising
The continuous circulation valve of any one of claims 1 to 8,
a side valve input line connected to the side valve to inject a circulating medium into the central passage through the side valve;
the main valve input pipeline is connected with the central channel of the valve body and can inject a circulating medium into the central channel; and
the control system is used for controlling the opening and closing of a main cycle and a side cycle, a main valve is opened and a side valve is closed during the main cycle, and circulating medium is injected into the central channel through an input pipeline of the main valve; during the side circulation, the main valve is closed, the side valve is opened, and the circulating medium is injected into the central channel through the side valve input pipeline.
10. A valve continuous cycle gas drilling process, wherein the process is carried out using a valve continuous cycle gas drilling system according to claim 9, the process comprising one or more of drilling, tripping and tripping, wherein,
the continuous circulation valve is pre-attached to the drill string,
during a drilling action, the continuous circulation valve is in a main circulation;
the drill string receiving operation comprises the following actions of sequentially switching the Nth drill string into a side circulation, connecting the (N + 1) th drill string, starting a main circulation of the (N + 1) th drill string and switching the drill string and the Nth drill string into a main circulation;
during a tripping action, the continuous circulation valve is in a main circulation;
the drill string unloading operation comprises the following actions which are carried out in sequence, namely, taking out the Mth drill string and the continuous circulation valve part of the Mth drill string, switching the Mth drill string to a side circulation and closing a main circulation of the Mth drill string, unloading the Mth drill string, and switching the Mth drill string to the side circulation;
the switching to the side circulation action comprises the steps of sequentially opening a side valve and connecting a side valve input pipeline, controlling to open the side circulation and close the main circulation by using a control system, closing a main valve and detaching the main valve input pipeline;
the switching to the main cycle comprises sequentially opening the main valve and connecting the main valve input line, using the control system to control the opening of the main cycle and the closing of the side cycle, closing the side valve and removing the side valve input line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111296333.XA CN114622864A (en) | 2021-11-03 | 2021-11-03 | Continuous circulating valve suitable for inflation drilling, drilling system and process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111296333.XA CN114622864A (en) | 2021-11-03 | 2021-11-03 | Continuous circulating valve suitable for inflation drilling, drilling system and process |
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| CN114622864A true CN114622864A (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111296333.XA Pending CN114622864A (en) | 2021-11-03 | 2021-11-03 | Continuous circulating valve suitable for inflation drilling, drilling system and process |
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| CN (1) | CN114622864A (en) |
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