CN112360336A - Method for drilling by screw drill for natural gas exploitation - Google Patents
Method for drilling by screw drill for natural gas exploitation Download PDFInfo
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- CN112360336A CN112360336A CN202011406891.2A CN202011406891A CN112360336A CN 112360336 A CN112360336 A CN 112360336A CN 202011406891 A CN202011406891 A CN 202011406891A CN 112360336 A CN112360336 A CN 112360336A
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- 238000005553 drilling Methods 0.000 title claims abstract description 59
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003345 natural gas Substances 0.000 title claims abstract description 17
- 239000000725 suspension Substances 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 239000002343 natural gas well Substances 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000009471 action Effects 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 6
- 238000000605 extraction Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention relates to the technical field of natural gas extraction equipment, and discloses a method for drilling natural gas by using a screw drill, which comprises a natural gas well wall, wherein a suspension assembly is movably sleeved in the natural gas well wall, a bypass valve body is arranged in the bypass valve assembly, a valve core mechanism is fixedly arranged at the top end of the bypass valve body, the valve core mechanism comprises a bypass valve core, and a valve ball boss is arranged in the bypass valve core. The natural gas opening screw drill and the drilling method thereof are adopted, and the valve ball closing track and the external structure thereof are arranged, so that the input valve closing ball can be accurately aligned to the flow slotted hole on the connecting pipeline along the track of the valve opening ball and locked.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation equipment, in particular to a drilling method of a screw drill for natural gas exploitation.
Background
The screw drilling tool is a power device which converts the pressure energy of liquid into mechanical energy through a positive displacement hydraulic motor so as to achieve the purpose of drilling, has the advantages of low rotating speed, large torque and large discharge capacity as well as is used as power output equipment at the bottom of a well, is widely applied to deep drilling operation of the bottom of the well such as petroleum, natural gas and the like, and mainly comprises a bypass valve assembly, a motor driving assembly and a transmission assembly.
The bypass valve assembly is used as a mechanism for changing the flow direction of liquid in the screw drill tool, when well leakage occurs in the drilling process, the construction operation of plugging high-concentration and large-particle plugging materials and cement squeezing can be effectively realized by activating the on-off of the bypass valve, so that the repeated drilling and tripping operation of the screw drill tool is reduced, at present, the on-off action of the bypass valve is realized by throwing the valve ball, but the valve ball is used as a ball body structure, and under the smooth inner wall of the valve body, the phenomenon of shaking deviation is easily generated under the action of high-speed and high-pressure flowing stamping of drilling fluid, so that the tightness of the bypass valve body in the on-off process is poor, and when the valve ball is thrown, the liquid channel is positioned on the side surface of the valve body, so that the thrown valve ball is difficult to timely and accurately block the liquid channel, and the accuracy of the on-off of the bypass valve in the screw drill tool, The reliability is low.
Disclosure of Invention
Technical problem to be solved
The invention provides a screw drill for opening natural gas and a drilling method thereof, which have the advantages of automatically locking the position of a valve ball, avoiding the phenomenon of shaking and deviation under the flow impact of drilling fluid, better sealing performance and precision of a whole bypass valve and higher reliability, and solve the problem that the on-off action of the bypass valve in the screw drill is realized by throwing the valve ball which is used as a ball body structure, under the smooth inner wall of the valve body, the drilling fluid is easy to flow and punch under the action of high speed and high pressure, the phenomenon of shaking and deviation occurs, so that the sealing performance of the bypass valve body is poor when the bypass valve body is switched on and off, and when a valve ball is thrown, because the liquid channel is positioned on the side surface of the valve body, the thrown valve closing ball is difficult to timely and accurately seal the liquid channel, the screw drilling tool has the problems of poor accuracy and low reliability in the process of switching on and off the bypass valve.
(II) technical scheme
The invention provides the following technical scheme: a screw drill for natural gas production and a drilling method thereof comprise a natural gas well wall, wherein a suspension assembly is movably sleeved inside the natural gas well wall, a connecting pipeline is fixedly installed at the bottom end of the suspension assembly, four groups of circulation groove holes are uniformly formed in the connecting pipeline, a bypass valve assembly is movably sleeved on the inner wall of the connecting pipeline, a ball basket support is fixedly installed at the bottom of an inner cavity of the connecting pipeline, a motor transmission assembly is arranged at the bottom end of the connecting pipeline, the bypass valve assembly comprises a bypass valve body, the outer surface of the bypass valve body is movably sleeved with the inner wall of the connecting pipeline, a valve core mechanism is fixedly installed at the top end of the bypass valve body, the valve core mechanism comprises a bypass valve core, a valve ball boss is arranged inside the bypass valve core, an elastic ring groove I is arranged on the inner wall of the bypass valve core and is positioned under, the inside of elasticity annular I is equipped with elasticity annular II, the top fixed mounting of bypass case has the valve ball track, the bottom of bypass case surface is passed through reset spring and is connected with the recess transmission on the connecting tube inner wall.
Preferably, the top end and the bottom end of the valve ball boss are both of a hemispherical curved surface structure, and the valve ball boss is made of elastic rubber.
Preferably, the bottom of the valve ball track is of a spherical curved surface structure, and the diameter of the valve ball track is larger than the inner diameter of a flow groove hole in the connecting pipeline.
Preferably, the inner wall of the elastic ring groove II is of an oval structure, and the opened position of the elastic ring groove II is located at the thickest part of the valve ball boss.
Preferably, the outer part of the bypass valve assembly is in a convex structure and is matched with the groove in the inner cavity of the connecting pipeline.
Preferably, the maximum compression length of the return spring is equal to the length between the central axis of the flow groove hole in the connecting pipeline and the central axis of the valve ball track.
Preferably, a spiral bypass sleeve is arranged in the middle of the outer surface of the connecting pipeline and at the position of the flow slot hole, and a jet flow channel with a downward opening is arranged on the surface of the bypass sleeve.
A screw drill for natural gas exploitation and a drilling method thereof mainly comprise the following working stages:
during normal drilling
The drilling tool is connected to a pump station through a drill string to convey a high-pressure transmission medium, so that the high-pressure transmission medium is transmitted to a motor transmission assembly through inner cavities of the drill string, a suspension assembly and a bypass valve assembly, and a drill bit at the bottom of the drilling tool is driven to perform rotary drilling operation;
by-pass valve opening
When the screw drilling tool has a well leakage phenomenon in the drilling process, firstly, the drilling tool is started to move the drill bit to a safe position, then a valve opening ball is thrown in from the top of the drill bit to enable the drill bit to fall into a valve ball boss along a drill string and a suspension assembly and to be contacted with the valve ball boss, then a low-pressure pump is used for punching operation, so that a bypass valve core slides downwards along the inner wall of a connecting pipeline and compresses a return spring until a valve ball track at the top end of the bypass valve core is flush with a flow groove hole on the connecting pipeline to open a bypass valve, then high-concentration and large-particle plugging materials and cement extrusion can be pumped into a gap between a natural gas well wall and the connecting pipeline to perform plugging operation,
meanwhile, after the pressure of the low-pressure pump is reduced, the bypass valve core can slowly move upwards to block a flow groove hole on a connecting pipeline under the action of a return spring, and therefore, when a valve opening ball is thrown in, the bypass valve can be switched on and off for many times;
the bypass valve is closed, and normal drilling is carried out again
When the construction of the well leakage plugging is finished and the bypass valve assembly needs to be closed, valve closing balls with the number corresponding to that of the circulation slotted holes on the connecting pipeline are thrown into the screw drilling tool again, under the guiding action of the valve opening balls and the track of the valve ball track, the valve closing balls with the number corresponding to that of the thrown valve closing balls can accurately fall into the valve ball track, the circulation slotted holes on the connecting pipeline are further plugged, then the low-pressure pump station continuously exerts pressure on the valve closing balls, the shearing pressure on the valve opening balls is larger than that of the valve ball bosses, so that the valve ball bosses are extruded and deformed to compress the elastic ring grooves II and the elastic ring grooves I until the valve opening balls on the valve ball bosses penetrate through the valve ball bosses and fall into the ball basket support, and meanwhile, after the pressure of the low-pressure pump is lost by the bypass valve core, the valve core is driven to move upwards under the action of the reset spring, so, so that the high-pressure transmission medium can fall into the ball basket support, the bypass valve core is used for plugging a through slot on the connecting pipeline, and meanwhile, the high-pressure transmission medium in the pump station can be continuously conveyed into the motor transmission assembly and drives the drill bit to continuously perform drilling operation.
(III) advantageous effects
The invention has the following beneficial effects:
1. the natural gas opening screw drill and the drilling method thereof are adopted, and the valve ball closing track and the external structure thereof are arranged, so that the input valve closing ball can be accurately aligned to the flow slotted hole on the connecting pipeline along the track of the valve opening ball and locked.
2. The valve ball boss, the external structure of the valve ball boss and the material of the valve ball boss are arranged, so that the valve ball boss has excellent elastic performance, can be well contacted with the valve ball when being thrown into the valve ball to prevent pressure leakage, and can generate good elastic deformation when the valve ball passes through the valve ball boss under the action of the elastic ring groove I and the elastic ring groove II, so that the surface of the valve ball boss cannot be abraded, the sealing performance of a bypass valve in the screw drill when the bypass valve is switched on and switched off is further improved, and the service life of the bypass valve in the screw drill is prolonged.
Drawings
FIG. 1 is a schematic view of the normal drilling structure of the screw drill of the present invention;
FIG. 2 is a schematic structural diagram of the bypass valve of the screw drill according to the present invention;
FIG. 3 is a schematic structural diagram of a screw drilling tool closing bypass valve according to the present invention;
FIG. 4 is a schematic view of the structure of the screw drill for normal drilling again;
fig. 5 is a partial cross-sectional view of a valve core mechanism according to the present invention.
In the figure: 1. a natural gas well wall; 2. a suspension assembly; 3. a bypass valve assembly; 31. a bypass valve body; 32. a valve core mechanism; 321. a bypass spool; 322. a valve ball boss; 323. an elastic ring groove I; 324. an elastic ring groove II; 325. a valve ball track; 33. a return spring; 4. connecting a pipeline; 5. a basketball stand; 6. a motor drive assembly; 7. opening a valve ball; 8. and closing the valve ball.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, a screw drill for natural gas drilling and a drilling method thereof, comprising a natural gas well wall 1, wherein a suspension assembly 2 is movably sleeved inside the natural gas well wall 1, a connecting pipe 4 is fixedly installed at the bottom end of the suspension assembly 2, four groups of flow through slots are uniformly arranged inside the connecting pipe 4, a bypass valve assembly 3 is movably sleeved on the inner wall of the connecting pipe 4, a ball basket support 5 is fixedly installed at the bottom of an inner cavity of the connecting pipe 4, a motor transmission assembly 6 is arranged at the bottom end of the connecting pipe 4, the bypass valve assembly 3 comprises a bypass valve body 31, the outer surface of the bypass valve body 31 is movably sleeved with the inner wall of the connecting pipe 4, a valve core mechanism 32 is fixedly installed at the top end of the bypass valve body 31, the valve core mechanism 32 comprises a bypass valve core 321, a valve ball boss 322 is arranged inside the bypass valve core 321, the inner wall of the bypass valve core, an elastic ring groove II 324 is formed in the elastic ring groove I323, a valve ball track 325 is fixedly mounted at the top end of the bypass valve core 321, and the bottom of the outer surface of the bypass valve core 321 is in transmission connection with a groove in the inner wall of the connecting pipeline 4 through a return spring 33.
In this technical scheme, the top and the bottom of valve ball boss 322 all establish to hemispherical curved surface structure, and it adopts and be that the elastic rubber material is made and form.
In this embodiment, the bottom of the ball track 325 is a spherical curved surface structure, and the diameter of the ball track is larger than the inner diameter of the through hole of the connecting pipe 4.
In the technical scheme, the inner wall of the elastic ring groove II 324 is in an oval structure, and the opened position of the elastic ring groove II is located at the thickest part of the valve ball boss 322.
In this technical scheme, bypass valve assembly 3's outside becomes convex font structure, and mutually supports between the recess in the connecting tube 4 inner chamber.
In this embodiment, the maximum compression length of the return spring 33 is equal to the length between the central axis of the flow channel in the connecting pipe 4 and the central axis of the ball track 325.
In the technical scheme, a spiral bypass sleeve is arranged in the middle of the outer surface of the connecting pipeline 4 and at the position of the flow slot hole, and a jet flow channel with a downward opening is arranged on the surface of the bypass sleeve.
The use method and the working principle of the embodiment are as follows:
a screw drill for natural gas exploitation and a drilling method thereof mainly comprise the following working stages:
during normal drilling
As shown in fig. 1, the drilling tool is connected to a pump station through a drill string to convey high-pressure transmission medium, so that the high-pressure transmission medium is transmitted to a motor transmission assembly 6 through inner cavities of the drill string, a suspension assembly 2 and a bypass valve assembly 3, and a drill bit at the bottom of the drilling tool is driven to perform rotary drilling operation;
by-pass valve opening
As shown in fig. 2, when the screw drill tool leaks during drilling, the drill bit is first tripped to move to a safe position, then an opening ball 7 is thrown in from the top of the drill bit to drop into the ball boss 322 along the drill string and the suspension assembly 2 and contact with the ball boss, then a low pressure pump is used for punching operation, so that the bypass valve core 321 slides downwards along the inner wall of the connecting pipe 4 and compresses the return spring 33 until the ball track 325 at the top end of the bypass valve core 321 is flush with the flow groove hole on the connecting pipe 4 to open the bypass valve, then high-concentration and large-particle plugging materials and cement squeeze can be pumped into the gap between the natural gas well wall 1 and the connecting pipe 4 to perform plugging operation,
meanwhile, after the pressure of the low-pressure pump is reduced, the bypass valve core 321 can slowly move upwards to block the flow groove hole on the connecting pipeline 4 under the action of the return spring 33, and then the bypass valve can be switched on and off for many times when a valve opening ball 7 is put into the bypass valve;
the bypass valve is closed, and normal drilling is carried out again
As shown in fig. 3 and 4, when the bypass valve assembly 3 needs to be closed after the construction of the lost circulation and plugging is completed, the valve closing balls 8 with the number corresponding to that of the flow slots on the connecting pipeline 4 are put into the screw drill again, and under the guiding action of the valve opening balls 7 and the valve ball tracks 325, the valve closing balls 8 with the number corresponding to that of the put-in can accurately fall onto the valve ball tracks 325, so as to realize the plugging operation of the flow slots on the connecting pipeline 4, then the low-pressure pump station continuously presses the valve closing balls, so that the shearing pressure on the valve opening balls 7 is greater than that of the valve ball bosses 322, so that the valve ball bosses 322 are extruded and deformed to compress the elastic ring grooves ii 324 and the elastic ring grooves i 323 until the valve opening balls 7 on the valve ball bosses 322 pass through the valve ball bosses 322 and fall into the ball basket support 5, and when the pressure of the bypass valve core 321 is lost, the bypass valve core is driven to move upwards under the, so that the valve closing ball 8 and the inner wall of the connecting pipeline 4 are mutually extruded, and then the valve closing ball and the inner wall of the connecting pipeline fall into the ball basket support 5, and then the bypass valve core 321 is utilized to plug a through slot hole on the connecting pipeline 4, and simultaneously, the high-pressure transmission medium in the pump station can be continuously conveyed into the motor transmission assembly 6, and the drill bit is driven to continuously carry out drilling operation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a natural gas is opened and is adopted screw rod drilling tool probing method, includes the natural gas wall of a well (1), the inside movable sleeve of the natural gas wall of a well (1) is equipped with and hangs assembly (2), the bottom fixed mounting who hangs assembly (2) has connecting tube (4), and the inside of connecting tube (4) is even is equipped with four group's circulation slotted holes, the inner wall movable sleeve of connecting tube (4) is equipped with bypass valve assembly (3), the bottom fixed mounting of connecting tube (4) inner chamber has basket support (5), the bottom of connecting tube (4) is equipped with motor drive assembly (6), its characterized in that: the bypass valve assembly (3) comprises a bypass valve body (31), the outer surface of the bypass valve body (31) is movably sleeved with the inner wall of the connecting pipeline (4), a valve core mechanism (32) is fixedly installed at the top end of the bypass valve body (31), the valve core mechanism (32) comprises a bypass valve core (321), a valve ball boss (322) is arranged inside the bypass valve core (321), an elastic ring groove I (323) is arranged on the inner wall of the bypass valve core (321) and right below the valve ball boss (322), an elastic ring groove II (324) is arranged inside the elastic ring groove I (323), a valve ball track (325) is fixedly installed at the top end of the bypass valve core (321), and the bottom of the outer surface of the bypass valve core (321) is in transmission connection with a groove on the inner wall of the connecting pipeline (4) through a return spring (33);
the drilling method comprises the following steps
S1 normal drilling
The drilling tool is connected to a pump station through a drill string to convey a high-pressure transmission medium, so that the high-pressure transmission medium is transmitted to a motor transmission assembly through inner cavities of the drill string, a suspension assembly and a bypass valve assembly, and a drill bit at the bottom of the drilling tool is driven to perform rotary drilling operation;
s2 opening bypass valve
When the screw drilling tool has a well leakage phenomenon in the drilling process, firstly, the drilling tool is started to move the drill bit to a safe position, then a valve opening ball is thrown in from the top of the drill bit to enable the drill bit to fall into a valve ball boss along a drill string and a suspension assembly and to be contacted with the valve ball boss, then a low-pressure pump is used for punching operation, so that a bypass valve core slides downwards along the inner wall of a connecting pipeline and compresses a return spring until a valve ball track at the top end of the bypass valve core is flush with a flow groove hole on the connecting pipeline to open a bypass valve, then high-concentration and large-particle plugging materials and cement extrusion can be pumped into a gap between a natural gas well wall and the connecting pipeline to perform plugging operation,
meanwhile, after the pressure of the low-pressure pump is reduced, the bypass valve core can slowly move upwards to block a flow groove hole on a connecting pipeline under the action of a return spring, and therefore, when a valve opening ball is thrown in, the bypass valve can be switched on and off for many times;
s3 closing the bypass valve and carrying out normal drilling again
When the construction of the well leakage plugging is finished and the bypass valve assembly needs to be closed, valve closing balls with the number corresponding to that of the circulation slotted holes on the connecting pipeline are thrown into the screw drilling tool again, under the guiding action of the valve opening balls and the track of the valve ball track, the valve closing balls with the number corresponding to that of the thrown valve closing balls can accurately fall into the valve ball track, the circulation slotted holes on the connecting pipeline are further plugged, then the low-pressure pump station continuously exerts pressure on the valve closing balls, the shearing pressure on the valve opening balls is larger than that of the valve ball bosses, so that the valve ball bosses are extruded and deformed to compress the elastic ring grooves II and the elastic ring grooves I until the valve opening balls on the valve ball bosses penetrate through the valve ball bosses and fall into the ball basket support, and meanwhile, after the pressure of the low-pressure pump is lost by the bypass valve core, the valve core is driven to move upwards under the action of the reset spring, so, so that the high-pressure transmission medium can fall into the ball basket support, the bypass valve core is used for plugging a through slot on the connecting pipeline, and meanwhile, the high-pressure transmission medium in the pump station can be continuously conveyed into the motor transmission assembly and drives the drill bit to continuously perform drilling operation.
2. A method of drilling with a screw drill for gas production according to claim 1, characterized in that: the top end and the bottom end of the valve ball boss (322) are both of a hemispherical curved surface structure, and the valve ball boss is made of elastic rubber.
3. A method of drilling with a screw drill for gas production according to claim 1, characterized in that: the bottom of the valve ball track (325) is of a spherical curved surface structure, and the diameter of the valve ball track is larger than the inner diameter of a circulation slotted hole in the connecting pipeline (4).
4. A method of drilling with a screw drill for gas production according to claim 1, characterized in that: the inner wall of the elastic ring groove II (324) is of an oval structure, and the opened position of the elastic ring groove II is located at the thickest part of the valve ball boss (322).
5. A method of drilling with a screw drill for gas production according to claim 1, characterized in that: the outer part of the bypass valve assembly (3) is of a convex structure and is matched with the grooves in the inner cavity of the connecting pipeline (4).
6. A method of drilling with a screw drill for gas production according to claim 1, characterized in that: the maximum compression length of the return spring (33) is equal to the length between the central axis of the flow groove hole in the connecting pipeline (4) and the central axis of the valve ball track (325).
7. A method of drilling with a screw drill for gas production according to claim 1, characterized in that: the middle part of the outer surface of the connecting pipeline (4) and the position of the circulation slotted hole are provided with a spiral bypass sleeve, and the surface of the bypass sleeve is provided with a jet flow channel with a downward opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406891.2A CN112360336A (en) | 2020-12-05 | 2020-12-05 | Method for drilling by screw drill for natural gas exploitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406891.2A CN112360336A (en) | 2020-12-05 | 2020-12-05 | Method for drilling by screw drill for natural gas exploitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112360336A true CN112360336A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011406891.2A Withdrawn CN112360336A (en) | 2020-12-05 | 2020-12-05 | Method for drilling by screw drill for natural gas exploitation |
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| Country | Link |
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| CN (1) | CN112360336A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439424A (en) * | 2022-02-16 | 2022-05-06 | 成都德维石油技术服务有限责任公司 | Bypass valve capable of being opened and closed repeatedly |
-
2020
- 2020-12-05 CN CN202011406891.2A patent/CN112360336A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439424A (en) * | 2022-02-16 | 2022-05-06 | 成都德维石油技术服务有限责任公司 | Bypass valve capable of being opened and closed repeatedly |
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Application publication date: 20210212 |