CN112727412A - Environment-friendly well fluid discharging device for dynamic negative pressure perforation - Google Patents
Environment-friendly well fluid discharging device for dynamic negative pressure perforation Download PDFInfo
- Publication number
- CN112727412A CN112727412A CN202110027485.3A CN202110027485A CN112727412A CN 112727412 A CN112727412 A CN 112727412A CN 202110027485 A CN202110027485 A CN 202110027485A CN 112727412 A CN112727412 A CN 112727412A
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- China
- Prior art keywords
- negative pressure
- piston
- perforation
- well fluid
- tail main
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
Abstract
The invention relates to an environment-friendly well fluid discharging device for dynamic negative pressure perforation, which comprises a negative pressure gun tail main body, a switch valve, a unscrewing thread body and a piston, wherein the unscrewing thread body is sleeved on the negative pressure gun tail main body through a clamping groove, the lower part of the unscrewing thread body is connected with the switch valve through threads, the switch valve blocks the base part of the negative pressure gun tail main body, the bottom of the switch valve is provided with an opening, the bottom of the negative pressure gun tail main body is longitudinally provided with a plurality of liquid discharging holes, the center of the negative pressure gun tail main body is provided with a cavity, the piston is arranged in the cavity, the outer wall of the piston is connected with the inner wall of the cavity through threads, and the bottom of the piston just extends out of the opening at the bottom of the. The invention uses the piston valve switch principle, adds a piston switch on the axis of the gun tail of the negative pressure gun, and realizes the opening and closing of the liquid discharge channel of the gun tail of the negative pressure gun through the change of the relative position of the piston.
Description
Technical Field
The invention belongs to the field of oilfield machinery, and relates to an environment-friendly well fluid discharging device for dynamic negative pressure perforation.
Background
Dynamic underbalanced perforating of cables has been a very popular perforating technique. The dynamic negative pressure perforation process has the function of removing pollution to perforated pore canals and near-well geological rock stratums after perforation. The negative pressure generated by the negative pressure gun during dynamic negative pressure perforation can directly act on a perforation duct, and a compaction belt on the duct wall caused by jet flow is broken by utilizing the pressure difference between the inside and the outside of the duct wall. Meanwhile, liquid in the pore canal flows outwards under the action of the pressure difference between the inside and the outside of the pore wall, broken rock fragments are taken out of the pore canal, and the original permeability of the perforation pore canal and the cleanness of the pore canal are recovered. The well completion effect of perforation and the recovery ratio of oil and gas wells are improved.
The basic structure of the negative pressure gun used for the negative pressure perforation comprises a negative pressure device, a negative pressure gun body and a negative pressure gun tail. The negative pressure device is provided with a piston, the piston is in a sealed closed state before construction, after negative pressure perforation construction, the piston of the negative pressure device moves downwards under the action of detonation energy of the perforating gun and falls into the negative pressure gun, a liquid inlet hole of the negative pressure device is in an open state, well liquid after perforation flows into the negative pressure gun through the liquid inlet hole, the well liquid flowing into the negative pressure gun causes loss of the well liquid in a shaft, and the loss of the well liquid is generated instantly to generate negative pressure of a perforating well section, so that required dynamic negative pressure perforation is realized. In the whole perforation process, the negative pressure gun tail only plays a sealing role, and well liquid in the negative pressure gun can not be repeatedly discharged on site due to the construction working condition environment, so the liquid inlet hole also becomes a unique pore channel for discharging the well liquid, the well liquid in the perforated negative pressure gun can not be timely returned into the construction well, and can only be brought to the well site ground by the negative pressure gun for collection and treatment, thereby greatly increasing the labor intensity of well site workers, and easily causing the well liquid to flow to the ground to cause the environment pollution of the well site. Therefore, further improvements are needed.
Disclosure of Invention
The invention aims to provide an environment-friendly well fluid discharging device for dynamic negative pressure perforation, which solves the problem that well fluid cannot be timely reinjected into an oil gas well because a well fluid discharging mechanism is not designed on a negative pressure gun at present.
The invention is realized by the following technical scheme: the utility model provides an environmental protection well liquid discharging equipment for developments negative pressure perforation, includes negative pressure rifle tail main part, switch valve, unscrews the screwed body, piston, unscrew the screwed body and pass through draw-in groove suit in negative pressure rifle tail main part, unscrew screwed body lower part and pass through threaded connection switch valve, the basic part of switch valve shutoff negative pressure rifle tail main part, and there is the opening switch valve bottom, the bottom of negative pressure rifle tail main part is vertically opened there are a plurality of outage, the central authorities of negative pressure rifle tail main part are equipped with the cavity, be equipped with the piston in the cavity, pass through threaded connection between piston outer wall and the cavity inner wall, the bottom of piston just in time stretches out from the opening of switch valve bottom.
Furthermore, the piston is hollow, two ends of the piston are opened, and a channel is arranged between the side wall of the cavity and the liquid discharge hole.
Further, still include spacing pin, the lateral wall of switch valve on vertically open and to have the slot hole, spacing pin passes slot hole and negative pressure rifle tail main part fixed connection.
Furthermore, the upper end of the gun tail main body of the negative pressure gun is provided with an anti-blocking buffer spring body.
Further, the bottom end of the piston is arranged to be hexagonal.
Furthermore, the number of the liquid discharge holes is 8.
Furthermore, a sealing ring is arranged at the joint of the outer wall of the piston and the switch valve.
Adopt above-mentioned technical scheme's positive effect: the invention uses the piston valve switch principle, adds the piston switch on the axis of the negative pressure gun tail, and realizes the opening and closing of the negative pressure gun tail liquid discharge channel through the change of the relative position of the piston; the technical problem that the negative pressure gun can bear sealing pressure of at least more than 10Mpa and can be repeatedly opened and closed at a well head is solved, so that the negative pressure gun can be opened to discharge well liquid in the negative pressure gun to an oil-return gas well, and the negative pressure gun can be closed to bear pressure and seal under the kilometer well.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of the bottom of the body of the negative pressure gun breech.
Fig. 3 is a bottom view of the piston.
Fig. 4 is a side view of the switching valve.
In the figure, a gun tail main body of a negative pressure gun 1, a switch valve 2, a screwing body 3, a piston 4, a liquid discharge hole 5, a channel 6, a limit pin 7, a long hole 8 and a blocking-proof buffer spring body 9 are arranged.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but the present invention should not be construed as being limited thereto:
fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a top view of the bottom of a negative pressure gun tail main body, fig. 3 is a bottom view of a piston, and as shown in the figure, the environment-friendly well fluid discharging device for dynamic negative pressure perforation comprises a negative pressure gun tail main body 1, a switch valve 2, a unscrewing thread body 3 and a piston 4, wherein the unscrewing thread body 3 is sleeved on the negative pressure gun tail main body 1 through a clamping groove, the lower part of the unscrewing thread body 3 is connected with the switch valve 2 through a thread, the unscrewing thread body can rotate on the negative pressure gun tail main body but cannot move up and down, but the rotation of the unscrewing thread body can cause the switch valve to move up or down. The base of 2 shutoff negative pressure rifle tail main parts 1 of switch valve, and there is the opening switch valve 2 bottom, and the bottom of negative pressure rifle tail main part 1 vertically opens has a plurality of outage 5, and the central authorities of negative pressure rifle tail main part 1 are equipped with the cavity, are equipped with piston 4 in the cavity, pass through threaded connection between 4 outer walls of piston and the cavity inner wall, and the opening of 2 bottoms of switch valve is just in time followed to the bottom of piston 4 stretches out. The piston moves downwards, and when the top end of the piston is positioned below the channel, the channel is opened; when the top end of the piston is above the passage, the passage is closed. The valve is opened or closed to move up or down, so that the piston is still extended, and the liquid discharge hole is opened to discharge well liquid.
In order to extract air in the negative pressure gun when vacuum negative pressure perforation is needed, the piston 4 is hollow, two ends of the piston 4 are open, and a channel 6 is arranged between the side wall of the cavity and the liquid discharge hole 5. When the piston moves downwards and the top end of the piston is lower than the channel, the channel is opened, and air in the negative pressure gun can be pumped out from the bottom of the piston; when the piston moves upwards, the top end can close the channel. When the piston is screwed back to the original position, the piston is a piston valve at the tail of the environment-friendly negative pressure gun, and the sealing state of the negative pressure gun is recovered when the piston and the switch valve are reset.
Fig. 4 is a side view of the switch valve, and as shown in the figure, in order to limit the rotation of the switch valve and prevent the switch valve from falling off downwards, the switch valve further comprises a limit pin 7, a long hole 8 is longitudinally formed in the side wall of the switch valve 2, and the limit pin 7 penetrates through the long hole 8 to be fixedly connected with the gun tail main body 1 of the negative pressure gun. The slot hole provides upper and lower spacing for the removal of switch valve, and limit pin then restricts the switch valve rotation and drops.
In order to slow down the direct impact of a piston of the negative pressure device on the environment-friendly gun tail main body and prevent the blockage of a drainage channel, the upper end of the negative pressure gun tail main body 1 is provided with a blockage-preventing buffer spring body 9.
In order to facilitate the screwing-out of the piston, the bottom end of the piston 4 is hexagonal, and the piston can be rotated by using a wrench.
Specifically, the number of the liquid discharge holes 5 is 8.
In order to ensure that the sealing is not leaked, a sealing ring is arranged at the joint of the outer wall of the piston 4 and the switch valve 2.
One end of the environment-friendly gun tail main body is provided with Tr90 multiplied by 4 threads and a sealing groove which are matched with the perforating negative pressure gun, and the end is connected with the negative pressure gun tail through the threads during construction to seal the gun tail of the negative pressure gun, so that the negative pressure gun forms a closed cavity, and a pressure difference space is provided for pressure reduction (negative pressure) in a perforating section during negative pressure perforation. The upper end of the environment-friendly gun tail main body is provided with an anti-blocking buffer spring body which is used for slowing down the direct impact of a piston of the negative pressure device on the environment-friendly gun tail main body and preventing a drainage channel from being blocked. The important function of environmental protection negative pressure rifle tail is can in time the drainage, and the switch valve is in the same place with unscrewing the screw thread body, and through the screw thread of increasing pitch between, unscrewing the screw thread body and can pushing the switch valve fast and move about from top to bottom. When unscrewing the screw body and using special spanner clockwise rotation, the switching valve moves about to spacingly downwards, and the lower drainage channel of environmental protection negative pressure rifle tail is opened this moment, and well liquid can be followed the passageway discharge of opening. When the screwing-unscrewing thread body rotates anticlockwise by using a special spanner, the switch valve moves upwards to the limiting position, and the negative pressure gun tail is closed and seals the negative pressure gun body. The liquid discharge hole is used for discharging well liquid when the negative pressure gun tail is opened. When vacuum negative pressure perforation is needed, a channel is opened by screwing out the piston, air in the negative pressure gun is pumped out, and the piston is screwed back to the original position to seal a vacuum pore channel after vacuum pumping is finished. Meanwhile, when the piston is screwed back to the original position, the bottom end of the switch valve is sealed by the piston, and when the piston and the switch valve are reset, the negative pressure gun tail is sealed by the sealing rubber ring to recover the sealing state of the negative pressure gun.
During cable negative pressure perforation construction, the negative pressure gun provided with the negative pressure device is arranged at the lower end of the perforating gun, and the environment-friendly negative pressure gun tail is arranged at the tail part of the negative pressure gun to form the cable dynamic negative pressure perforation tubular column. The perforation pipe column is carried the perforation interval of oil gas well by the cable, after the perforation, the well head is retrieved by the cable to the perforation pipe column, when negative pressure gun exposed the well head, hover the perforation pipe column at the well head, insert the wrench groove of environmental protection rifle tail with special spanner on, the screw thread body is unscrewed in the clockwise rotation, switching valve moves down to spacing department under the drive of screw thread, the drainage channel of negative pressure rifle tail is opened, well liquid in the negative pressure gun flows into in the oil gas well from the passageway, the perforation pipe column receive and releases the perforation of ground repetition back again after well liquid is drained.
The negative pressure gun tail of the conventional negative pressure perforation only plays a role in bearing and sealing, well liquid flowing into the negative pressure gun after perforation is brought to a well site ground by the negative pressure gun for treatment, so that the well site environment pollution is easily caused, and the operation labor intensity of constructors is also increased.
The dynamic negative pressure perforation environment-friendly well fluid discharging device can be directly operated at a well head, and well fluid is directly reinjected into an oil gas well and the sealing and pressure-bearing state of a negative pressure gun is recovered by opening and closing the gun tail through rotating the unscrewing thread body on the environment-friendly gun tail through a special wrench. The well liquid after perforation is collected and treated at the construction well site without constructors, thereby greatly reducing the labor intensity of operators.
The invention uses the piston valve switch principle, adds the piston switch on the axis of the negative pressure gun tail, and realizes the opening and closing of the negative pressure gun tail liquid discharge channel through the change of the relative position of the piston; the technical problem that the negative pressure gun can bear sealing pressure of at least more than 10Mpa and can be repeatedly opened and closed at a well head is solved, so that the negative pressure gun can be opened to discharge well liquid in the negative pressure gun to an oil-return gas well, and the negative pressure gun can be closed to bear pressure and seal under the kilometer well.
Claims (7)
1. An environment-friendly well fluid discharging device for dynamic negative pressure perforation is characterized in that: including negative pressure rifle tail main part (1), ooff valve (2), unscrew threaded body (3), piston (4), unscrew threaded body (3) through the draw-in groove suit on negative pressure rifle tail main part (1), unscrew threaded body (3) lower part is through threaded connection ooff valve (2), ooff valve (2) shutoff negative pressure rifle tail main part's (1) basal portion, and ooff valve (2) bottom has the opening, the bottom of negative pressure rifle tail main part (1) is vertically opened has a plurality of outage (5), the central authorities of negative pressure rifle tail main part (1) are equipped with the cavity, be equipped with piston (4) in the cavity, through threaded connection between piston (4) outer wall and the cavity inner wall, the bottom of piston (4) just in time stretches out from the opening of ooff valve (2) bottom.
2. The environmentally friendly well fluid drainage device for dynamic negative pressure perforation of claim 1, wherein: the piston (4) is hollow, two ends of the piston (4) are opened, and a channel (6) is arranged between the side wall of the cavity and the liquid discharge hole (5).
3. The environmentally friendly well fluid drainage device for dynamic negative pressure perforation according to claim 1 or 2, wherein: still include spacing pin (7), the lateral wall of switch valve (2) on vertically open and to have slot hole (8), spacing pin (7) pass slot hole (8) and negative pressure rifle tail main part (1) fixed connection.
4. The environmentally friendly well fluid drainage device for dynamic negative pressure perforation of claim 1, wherein: the upper end of the negative pressure gun tail main body (1) is provided with an anti-blocking buffer spring body (9).
5. The environmentally friendly well fluid drainage device for dynamic negative pressure perforation of claim 1, wherein: the bottom end of the piston (4) is arranged to be hexagonal.
6. The environmentally friendly well fluid drainage device for dynamic negative pressure perforation of claim 1, wherein: the number of the liquid discharge holes (5) is 8.
7. The environmentally friendly well fluid drainage device for dynamic negative pressure perforation of claim 1, wherein: and a sealing ring is arranged at the joint of the outer wall of the piston (4) and the switch valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110027485.3A CN112727412A (en) | 2021-01-10 | 2021-01-10 | Environment-friendly well fluid discharging device for dynamic negative pressure perforation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110027485.3A CN112727412A (en) | 2021-01-10 | 2021-01-10 | Environment-friendly well fluid discharging device for dynamic negative pressure perforation |
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| Publication Number | Publication Date |
|---|---|
| CN112727412A true CN112727412A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110027485.3A Pending CN112727412A (en) | 2021-01-10 | 2021-01-10 | Environment-friendly well fluid discharging device for dynamic negative pressure perforation |
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| CN (1) | CN112727412A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307110A (en) * | 2023-12-01 | 2023-12-29 | 大庆金祥寓科技有限公司 | Reusable slideway non-return closing type environment-friendly dynamic negative pressure gun tail |
| CN117328841A (en) * | 2023-12-01 | 2024-01-02 | 大庆金祥寓科技有限公司 | Quick connection environment-friendly negative pressure gun |
-
2021
- 2021-01-10 CN CN202110027485.3A patent/CN112727412A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307110A (en) * | 2023-12-01 | 2023-12-29 | 大庆金祥寓科技有限公司 | Reusable slideway non-return closing type environment-friendly dynamic negative pressure gun tail |
| CN117328841A (en) * | 2023-12-01 | 2024-01-02 | 大庆金祥寓科技有限公司 | Quick connection environment-friendly negative pressure gun |
| CN117328841B (en) * | 2023-12-01 | 2024-02-13 | 大庆金祥寓科技有限公司 | Quick connection environment-friendly negative pressure gun |
| CN117307110B (en) * | 2023-12-01 | 2024-02-27 | 大庆金祥寓科技有限公司 | Reusable slideway non-return closing type environment-friendly dynamic negative pressure gun tail |
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