CN213116266U - Underground throttling and liquid discharging integrated device - Google Patents
Underground throttling and liquid discharging integrated device Download PDFInfo
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- CN213116266U CN213116266U CN202021080828.XU CN202021080828U CN213116266U CN 213116266 U CN213116266 U CN 213116266U CN 202021080828 U CN202021080828 U CN 202021080828U CN 213116266 U CN213116266 U CN 213116266U
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Abstract
The utility model provides an integrated device of underground throttling and liquid discharging, which comprises an annular pressure joint, wherein the annular pressure joint is connected with the bottom end of a continuous oil pipe; the alloy oil nozzle is arranged in the annular pressure joint and is detachably connected with the lower part of the annular pressure joint; and a supersonic diffuser tube disposed within the ring pressure joint, the supersonic diffuser tube defined above the alloy oil snout; and the annular pressure joint is lowered into the well along with the coiled tubing. The invention can be connected with a coiled tubing, and the coiled tubing is lowered to a preset well depth; because the coiled tubing is good in flexibility, the downhole throttling and liquid discharging integrated device can be driven to descend to any well depth and is not limited by well deviation.
Description
Technical Field
The utility model relates to a throttle and flowing back integrated device in pit belongs to oil gas field natural gas exploitation technical field.
Background
The underground throttling is a natural gas exploitation mode for transferring ground throttling to the underground, and the underground throttling can fully utilize terrestrial heat to heat the throttled natural gas, so that hydrates are prevented from being generated, pipeline blockage is avoided, and guarantee is provided for natural gas flow. In addition, ground heating equipment is omitted, so that the ground flow is simplified, and the method becomes a cost-reducing and efficiency-improving technology.
Conventional downhole choke devices have two types: one is a movable underground throttleer, which is lowered into an oil pipe by a preset depth by adopting steel wire operation, is suspended in the oil pipe by slips and is sealed by a rubber cylinder; the other type is a fixed underground throttle, a working barrel short section is connected to a designated position on a pipe column during oil pipe feeding, and the throttle is lowered into the working barrel short section by utilizing steel wire operation as required in the production process of a gas well to realize seat hanging and sealing.
Both the two devices need to be operated by steel wires, are limited by the operation capacity of the steel wires, and require that the operation depth is usually within the well deflection 35, but some shallow wells exist on site, the well deflection is usually started when the well is drilled, and the well deflection far exceeds 35 degrees at the position where the throttler needs to be operated, so that the underground throttling process cannot be implemented. In addition, the conventional downhole throttling also has the difficult problem of gas well drainage, accumulated liquid is easily formed in the middle and later periods of gas well production along with the decrease of the pressure and the yield of the gas well, and once the accumulated liquid is formed on the upper part of the throttling device, the normal production of the gas well is influenced.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems in the prior art, the utility model provides an underground throttling and liquid discharging integrated device which can be connected with a coiled tubing and can be driven to a preset well depth along with the coiled tubing; because the coiled tubing is good in flexibility, the downhole throttling and liquid discharging integrated device can be driven to descend to any well depth and is not limited by well deviation.
The utility model provides a throttle and flowing back integrated device in pit, include:
the annular pressure joint is connected to the bottom end of the coiled tubing;
the alloy oil nozzle is arranged in the annular pressure joint and is detachably connected with the lower part of the annular pressure joint; and
a supersonic diffuser tube disposed within the ring pressure joint, the supersonic diffuser tube defined above the alloy nozzle tip;
and the annular pressure joint is lowered into the well along with the coiled tubing.
The utility model has the further improvement that the bottom end of the ring pressure joint is plugged by a plug; and when a certain pressure is reached in the continuous oil pipe, the plug is separated from the annular pressure joint.
The utility model discloses a further improvement lies in, it forms the ring channel to set up the stair structure on the inner wall of the lower part that the ring pressure connects, the supersonic speed diffuser pipe sets up in the ring channel, the stair structure is injectd the position of the upper end of supersonic speed diffuser pipe, the alloy glib talker is injectd the position of the lower extreme of supersonic speed diffuser pipe.
The utility model is further improved in that the outer side of the alloy oil nozzle is provided with an oil nozzle sleeve, and the oil nozzle sleeve is connected with the annular pressure joint through a shearing pin;
after the pressure-holding ball is put in, the pressure is held above the supersonic speed diffusion pipe, when the pressure is increased to a certain value, the shearing pin is sheared, and the alloy oil nozzle and the supersonic speed diffusion pipe are separated from the ring pressure joint.
The utility model discloses a further improvement lies in, the lower extreme that the ring pressed the joint is connected with prevents the cover that falls, the end cap alloy glib talker with the ring pressed the joint to separate the back and fell prevent falling in the cover.
The utility model discloses a further improvement lies in, be provided with a plurality of through-holes on the outer wall of anti-falling cover.
The utility model discloses a further improvement lies in, the end cap is the end cap of soluble material.
The utility model discloses a further improvement lies in, the end cap with be provided with first sealing washer between the ring pressure connects, the oil plug cover with be provided with the second sealing washer between the ring pressure connects, the supersonic speed diffusion tube with be provided with the third sealing washer between the ring pressure connects.
The utility model discloses a further improvement lies in, prevent falling the cover with link to each other through the screw thread between the ring pressure connects.
The utility model discloses a further improvement lies in, the ring pressure connect the upper end be provided with the screw thread that continuous oil pipe links to each other, the ring pressure connect with continuous oil pipe links to each other through the mode of ring pressure.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a throttle and flowing back integrated device in pit, at the gas well initial stage of production, ring pressure articulate in the coiled tubing bottom, can make this embodiment the device is along with coiled tubing arrives predetermined well depth down. Because coiled tubing is flexible, can go down to arbitrary well depth, optional position, this embodiment the device also goes down optional position thereupon, does not receive the well deviation restriction. During production, the natural gas is throttled and depressurized after passing through the alloy oil nozzle, the flow speed of the natural gas is accelerated due to expansion, then the natural gas is further accelerated to a supersonic speed state through the supersonic speed diffusion pipe, the carried water is atomized, and the liquid discharge capacity of the gas well is improved.
The utility model discloses a throttle in pit directly links to each other with coiled tubing with flowing back integrated device, and it is firm to connect, can not drop, and traditional flow controller relies on the slips card to block at oil pipe's inner wall, probably has the risk that drops, consequently sees from connected mode, and this device is more reliable. In addition, compared with the traditional throttler, the device does not need a series of functions such as clamping, mechanical seat sealing and salvaging, so the device has much simpler structure and much lower processing cost.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:
fig. 1 is a schematic cross-sectional view of an integrated downhole throttling and draining device according to an embodiment of the present invention;
fig. 2 is an external schematic view of an integrated downhole throttling and draining device according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 1. the ring pressure joint comprises a ring pressure joint body 2, an alloy oil nozzle, 3, a supersonic speed diffusion pipe, 4, a plug, 5, an anti-falling cover, 11, a step structure, 12, threads, 21, an oil nozzle sleeve, 22, a shearing pin, 23, a second sealing ring, 31, a third sealing ring, 41, a first sealing ring, 51, a through hole, 52 and a screw thread.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clearly understood, the following description is made in further detail with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 schematically shows a downhole throttling and draining integrated device according to an embodiment of the invention, which comprises an annular pressure joint 1. The ring pressure joint 1 is of a cylindrical or tubular structure. An alloy oil nozzle 2 is arranged in the ring pressure joint 1, and the alloy oil nozzle 2 is detachably connected with the lower part of the ring pressure joint 1. The supersonic speed diffusion pipe 3 is arranged in the annular pressure joint 1, the supersonic speed diffusion pipe 3 is arranged above the alloy oil nozzle 2, the position of the supersonic speed diffusion pipe 3 is limited by the alloy oil nozzle 2, and the supersonic speed diffusion pipe 3 is fixed. Wherein, the ring pressure joint 1 is put into the well along with the coiled tubing.
In the downhole throttling and draining integrated device according to the embodiment, the annular pressure joint 1 is connected to the bottom end of the coiled tubing in the early production stage of the gas well, so that the device can be driven to the preset well depth along with the coiled tubing. Because coiled tubing is flexible, can go down to arbitrary well depth, optional position, this embodiment the device also goes down optional position thereupon, does not receive the well deviation restriction. During production, the natural gas is throttled and depressurized after passing through the alloy oil nozzle 2, the flow speed of the natural gas is accelerated due to expansion, then the natural gas is further accelerated to a supersonic speed state through the supersonic speed diffusion pipe 3, carried water can be atomized, and the liquid discharge capacity of a gas well is improved.
According to the device of the embodiment, the device is directly connected with the coiled tubing, the connection is firm, and the device cannot fall off, and the traditional choke holder is clamped on the inner wall of the coiled tubing by the slips, so that the risk of falling off is possible, and the device is more reliable in a connection mode. In addition, compared with the traditional throttler, the device does not need a series of functions such as clamping, mechanical seat sealing and salvaging, so the device has much simpler structure and much lower processing cost.
In one embodiment, as shown in fig. 1, a plug 4 is provided at the lower end of the ring compression joint 1, and the plug 4 plugs the bottom of the ring compression joint to seal the lower end of the ring compression joint 1. The plug 4 seals the alloy oil nozzle 2 and the supersonic speed diffusion pipe 3 in the annular pressure joint 1. The plug 4 is detachably connected with the annular pressure joint 1, and when the pressure in the continuous oil pipe is increased to a certain value, the plug 4 falls off from the annular pressure joint under the action of the pressure.
In the downhole throttling and liquid discharging integrated device according to the embodiment, the lower end of the annular pressure joint 1 is provided with the plug 4, and the plug 4 is utilized in the lowering process to separate the high-pressure environment of a shaft, so that the safety of operation is ensured. The plug 4 is detachably connected with the annular pressure joint 1, and after the plug is put into a preset position, the plug 4 can be separated from the annular pressure joint 1 to leave a gas production channel for production.
In one embodiment, as shown in fig. 1, a step structure 11 is arranged on the inner wall of the lower part of the ring pressure joint 1, the inner diameter of the lower part of the step structure 11 is larger, and the inner diameter of the upper part of the step structure 11 is smaller. The lower, larger inner diameter portion of the step structure 11 forms an annular groove. The supersonic diffuser pipe 3 is arranged in the annular groove, and the step structure 11 blocks and limits the upper end of the supersonic diffuser pipe 3, so that the supersonic diffuser pipe 3 cannot move upwards. The alloy oil nozzle 2 defines the lower end of the supersonic diffuser 3, so that the supersonic diffuser 3 cannot move downwards.
In the downhole throttling and liquid draining integrated device according to the embodiment, the annular groove is arranged at the lower part of the annular pressure joint 1, so that the supersonic speed diffusion pipe 3 and the alloy oil nozzle 2 are arranged inside the annular groove. The step structure 11 and the plug 4 can fix the position of the supersonic speed diffusion pipe 3 and prevent the supersonic speed diffusion pipe from moving up and down.
In one embodiment, as shown in FIG. 1, the alloy oil nipple 2 is a tubular structure with a central hole in the center. The outside cover of alloy glib talker 2 is equipped with glib talker cover 21, and glib talker cover 21 is annular pipe, and its inner wall is fixed continuous with the outer wall of alloy glib talker 2, and its outer wall links to each other with the ring pressure connects 1 is detachable. In the present embodiment, the nipple cover 21 is connected to the ring pressure fitting 1 by a shear pin 22.
When the downhole throttling and liquid discharging integrated device according to the embodiment is used, if the gas well needs to improve the yield, the pressure holding ball can be thrown through the wellhead, moves to the upper end of the supersonic speed diffusion pipe 3 and is clamped on the supersonic speed diffusion pipe 3. At this time, the pressure is suppressed above the pressure-suppressed ball, the pressure is increased to be capable of shearing the shearing pin 22, the oil nozzle sleeve 21 is separated from the annular pressure joint 1, the supersonic diffusion pipe 3 and the oil nozzle sleeve 21 are knocked down under the action of the pressure, the inner diameter of the annular pressure joint 1 is increased, and the yield is improved.
In one embodiment, as shown in fig. 1 and 2, a drop-proof cover 5 is connected to the lower end of the ring pressure joint 1, and the plug 4, the alloy oil nozzle 2 and the supersonic speed diffuser 3 are separated from the ring pressure joint 1 and then all fall into the drop-proof cover 5. In this embodiment, the anti-falling cover 5 is a cylindrical structure, and has an open upper end connected to the lower end of the ring pressure joint 1 and a closed lower end, and has the same outer diameter as that of the ring pressure joint 1. The anti-falling cover 5 can bear the falling plug 4, the alloy oil nozzle 2 and the supersonic speed diffusion pipe 3.
In one embodiment, the outer wall of the drop-proof cover 5 is provided with a plurality of through holes 51. The through holes 51 are distributed on the side wall and the lower end of the anti-falling cover 5, so that natural gas can smoothly pass through the through holes, and the inside and the outside are kept smooth. The drop shield 5 may also be made of a mesh material.
In a preferred embodiment, the plug 4 is made of a soluble material. The soluble material is a material which can be dissolved in the environment of underground acidic, alkaline or produced water. In the production process, natural gas penetrates through the through hole 51 of the plug 4 and enters the annular pressure joint 1, the plug 4 may be washed in the flowing process of the natural gas, the plug 4 is driven to move, and the plug 4 is brought to the bottom of the annular pressure joint 1 again to block the annular pressure joint 1 again with a certain probability. In this embodiment, the plug 4 is made of a soluble material, and the plug 4 after falling can be dissolved in produced water, so as to avoid the influence on production caused by the re-blocking of the ring pressing joint 1.
In one embodiment, a first sealing ring 41 is arranged between the plug 4 and the ring pressure joint, a second sealing ring 23 is arranged between the nozzle sleeve 21 and the ring pressure joint, and a third sealing ring 31 is arranged between the supersonic speed diffuser 3 and the ring pressure joint. In the present embodiment, O-rings are used as the first seal 41, the second seal 23, and the third seal 31.
In one embodiment, the drop-proof cover 5 is connected with the ring pressure joint 1 through a screw thread 52.
In one embodiment, the upper end of the ring pressure joint 1 is provided with threads 12 for connection to the coiled tubing. The ring pressure joint 1 and the coiled tubing can be connected through the threads 12, so that the connection is stable, the ring pressure joint is not easy to fall off, and the ring pressure joint is convenient to disassemble and assemble. And the ring pressure joint 1 is connected with the coiled tubing in a ring pressure mode.
In using the integrated downhole throttling and draining device according to the present embodiment,
firstly, assembling on the ground, before construction, connecting the ring pressing joint 1 of the device of the embodiment with the bottom end of the coiled tubing, connecting the ring pressing joint 1 with the tail end of the coiled tubing by a special ring pressing tool in a ring pressing connection mode, and converting the coiled tubing into a thread 12 joint to realize stable connection.
Then, the device is placed in the well along with the coiled tubing, a wellhead blowout preventer and a coiled tubing conveying device are installed at the wellhead, the coiled tubing with the device is placed at a preset position of the shaft, and the high-pressure environment of the shaft is isolated by the plug 4 in the placing process, so that the safety of operation is ensured.
After the device is put in place, the plug 4 is knocked down in a mode of injecting liquid nitrogen into the coiled tubing pump through the wellhead, after the liquid nitrogen is injected, the pressure is suppressed above the plug 4, the plug 4 is knocked down to the anti-falling cover 5 under the action of the pressure, and a gas production channel is reserved. The gas production channel starts to produce, the natural gas is throttled and depressurized after passing through the alloy oil nozzle 2, the flow speed of the natural gas is accelerated due to expansion, then the natural gas is further accelerated to a supersonic speed state through the supersonic speed diffusion pipe 3, the carried water is atomized, and the liquid discharge capacity of the gas well is improved.
When the yield of the gas well needs to be improved, the ball can be thrown to the upper end of the supersonic speed diffusion pipe 3 through a well head, and then the supersonic speed diffusion pipe 3 and the oil nozzle sleeve 21 are knocked down to the anti-falling cover 5 through pressure building.
The device is suitable for highly deviated wells or horizontal wells. For some highly deviated wells or horizontal wells with shallow deflecting points, the angle of inclination of the well is beyond the limit value of a downhole choke by wire operation when the minimum well depth required by downhole choke is not reached, usually 35 degrees, and at the moment, the conventional downhole choke process cannot be implemented. The device of this embodiment can then be lowered through coiled tubing to essentially any position in the wellbore as long as the tubing drift diameter is operational.
The device of the embodiment is also suitable for the liquid producing gas well. The downhole throttling and liquid discharging integrated device is internally provided with the supersonic speed diffusion pipe 3, the flow velocity of the natural gas reaches a supersonic speed state through diffusion, contraction and re-diffusion of the fluid, the capability and the efficiency of the natural gas carrying liquid oil or water are improved, and the downhole throttling and liquid discharging integrated device has more advantages in liquid discharging compared with a conventional throttling device.
The device is also suitable for the shale gas well fractured by large displacement, and for the well fractured by large displacement, in order to improve the displacement, the inner drift diameter of the commonly used underground pipe column is very large, for example, the shale gas well is fractured by a 5.5-inch casing pipe, the casing pipe is used for production at the initial stage, for the wells, a large-diameter throttle matched with the size of the casing pipe is needed, the body diameter needs to be about 108mm and is far larger than 78mm of the main drift diameter of a wellhead gas production tree, so that the underground throttle cannot be lowered from the wellhead gas production tree, the underground throttle can be implemented by the device at this time, and meanwhile, the problem of liquid drainage in the middle and later stages of the shale gas well is solved.
In the present invention, "up" means a direction close to the wellhead, and "down" means a direction away from the wellhead.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. An integrated downhole throttling and draining device, comprising:
the annular pressure joint (1), the annular pressure joint (1) is connected to the bottom end of the coiled tubing;
the alloy oil nozzle (2) is arranged in the annular pressure joint (1), and the alloy oil nozzle (2) is detachably connected with the lower part of the annular pressure joint (1); and
a supersonic diffuser pipe (3) disposed within the ring pressure joint (1), the supersonic diffuser pipe (3) being defined above the alloy oil snout (2);
wherein the annular pressure joint (1) is lowered into the well along with the coiled tubing.
2. A downhole throttling and draining integrated device according to claim 1, wherein the bottom end of the ring pressure joint (1) is plugged by a plug (4); when a certain pressure is reached in the continuous oil pipe, the plug (4) is separated from the annular pressure joint (1).
3. A downhole throttling and draining integrated device according to claim 2, wherein a step structure (11) is arranged on the inner wall of the lower part of the ring pressure joint (1) to form an annular groove, the supersonic speed diffuser pipe (3) is arranged in the annular groove, the step structure (11) defines the position of the upper end of the supersonic speed diffuser pipe (3), and the alloy oil nozzle (2) defines the position of the lower end of the supersonic speed diffuser pipe (3).
4. A downhole throttling and draining integrated device according to claim 3, wherein the alloy oil nozzle (2) is provided with an oil nozzle sleeve (21) at the outer side, and the oil nozzle sleeve (21) is connected with the annular pressure joint (1) through a shearing pin (22);
after the pressure-holding ball is put in, the pressure is held above the supersonic speed diffusion pipe (3), the shearing pin (22) is sheared when the pressure is increased to a certain value, and the alloy oil nozzle (2) and the supersonic speed diffusion pipe (3) are separated from the annular pressure joint (1).
5. A downhole throttling and liquid draining integrated device according to claim 4, wherein a drop-proof cover (5) is connected to the lower end of the ring pressure joint (1), and the choke plug (4), the alloy oil nozzle (2) and the supersonic speed diffusing pipe (3) drop into the drop-proof cover (5) after being separated from the ring pressure joint (1).
6. A downhole integrated throttling and draining device according to claim 5, wherein the outer wall of the drop shield (5) is provided with a plurality of through holes (51).
7. A downhole integrated throttling and draining device according to any of claims 2-6, wherein the plug (4) is a plug (4) of a soluble material.
8. A downhole integrated throttling and draining device according to any one of claims 4 to 6, wherein a first sealing ring (41) is arranged between the choke plug (4) and the ring pressure joint, a second sealing ring (23) is arranged between the choke sleeve (21) and the ring pressure joint, and a third sealing ring (31) is arranged between the supersonic diffuser tube (3) and the ring pressure joint.
9. A downhole integrated throttling and draining device according to claim 5 or 6, wherein the drop-proof cover (5) is connected with the ring pressure joint (1) through a screw thread (52).
10. A downhole integrated throttling and draining device according to any of claims 1-6, wherein the upper end of the ring pressure joint (1) is provided with a thread (12) connected with the coiled tubing, and the ring pressure joint (1) is connected with the coiled tubing in a ring pressure manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021080828.XU CN213116266U (en) | 2020-06-12 | 2020-06-12 | Underground throttling and liquid discharging integrated device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021080828.XU CN213116266U (en) | 2020-06-12 | 2020-06-12 | Underground throttling and liquid discharging integrated device |
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| Publication Number | Publication Date |
|---|---|
| CN213116266U true CN213116266U (en) | 2021-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021080828.XU Active CN213116266U (en) | 2020-06-12 | 2020-06-12 | Underground throttling and liquid discharging integrated device |
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| CN (1) | CN213116266U (en) |
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