CN112302591A - Vortex drainage gas production device and tubular column - Google Patents
Vortex drainage gas production device and tubular column Download PDFInfo
- Publication number
- CN112302591A CN112302591A CN201910687841.7A CN201910687841A CN112302591A CN 112302591 A CN112302591 A CN 112302591A CN 201910687841 A CN201910687841 A CN 201910687841A CN 112302591 A CN112302591 A CN 112302591A
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- vortex
- gas production
- drainage gas
- production device
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 210000000078 claw Anatomy 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 58
- 239000012530 fluid Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
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Classifications
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
Abstract
The invention provides a vortex water drainage gas production device and a tubular column, wherein the vortex water drainage gas production device comprises an upper joint; the vortex rod is fixedly arranged at the lower end of the upper joint, and a spiral groove is arranged on the outer wall of the upper end of the vortex rod; the vortex drainage gas production device is characterized in that a first clamping hanging piece is sleeved on the outer wall of the lower end of a vortex rod below a groove, the vortex drainage gas production device is of a rear-mounted structure, a second clamping hanging piece matched with the vortex drainage gas production device can be put into a shaft firstly, the vortex drainage gas production device is put into the vortex drainage gas production device when drainage gas production is needed, the vortex drainage gas production device and the second clamping hanging piece are matched to generate a vortex flow channel, external energy is not needed, the process utilizing the vortex drainage gas production device does not pollute the stratum, and the vortex drainage gas production device is environment-friendly.
Description
Technical Field
The invention relates to the technical field of natural gas well downhole tools, in particular to a vortex drainage gas production device and a tubular column.
Background
The drainage gas recovery process technology is one of important measures for exploiting the production potential of gas wells with water-gas reservoirs and improving the gas reservoir recovery ratio.
In the prior art, equipment such as an electric submersible pump, a jet pump, a screw pump and the like can be used for completing drainage and gas production, but the process needs external energy and the utilized device has a complex structure; foam drainage gas recovery can also be used, but this process causes contamination of the formation.
Therefore, a vortex drainage gas production device which is simple in structure and does not cause stratum pollution is needed, and a technical problem to be solved urgently is needed.
Disclosure of Invention
The invention provides a vortex water drainage gas production device and a tubular column, aiming at part or all of the technical problems in the prior art. The vortex water drainage gas production device is constructed in a rear-mounted mode, a second clamping and hanging piece which can be matched with the vortex water drainage gas production device can be put into a shaft firstly, and the vortex water drainage gas production device is put into the vortex water drainage gas production device when water drainage gas production is needed. And the second fastener which is put in first is cylindrical, and the inner drift diameter of the tubular column and later-stage operation are not influenced. Meanwhile, the device can generate a rotational flow channel by matching with the second clamping and hanging piece, external energy is not needed, and the process utilizing the device does not pollute the stratum and is environment-friendly.
According to a first aspect of the present invention, there is provided a vortex drainage gas production apparatus comprising:
an upper joint is arranged on the upper end of the connecting rod,
a vortex rod fixedly arranged at the lower end of the upper joint, a spiral groove arranged on the outer wall of the upper end of the vortex rod,
the first clamping and hanging piece is sleeved on the outer wall of the lower end of the vortex rod below the groove.
In one embodiment, a liquid expansion sealing strip is embedded on the partition wall of the groove.
In one embodiment, a holding groove for holding the sealing strip expanding in the presence of liquid is provided on the partition wall, and a holding part extending from the two groove walls in an unclosed opposite manner is provided at the open end of the holding groove.
In one embodiment, the vortex rod has:
the outer wall of the spiral groove is provided with a first section of the spiral groove,
a second section fixedly connected to the first section, the second section having an outer wall with a reduced diameter dimension relative to the first section,
the upper section of the second section is in clearance fit with the first clamping hanging piece, and the lower section of the second section is connected with the first clamping hanging piece through a first shearing pin.
In one embodiment, a transition bevel is provided between the first section and the second section.
In one embodiment, the second section is configured in a cylindrical shape capable of communicating with the inner cavity of the first hooking member, and a communication hole communicating inside and outside is configured on a side wall thereof.
In one embodiment, the first snap hook includes a first snap hook body connected to the lower section of the second section, circumferentially spaced resilient fingers extending axially upward from the first snap hook body, and a first snap hook portion disposed on a peripheral wall of the resilient fingers.
In one embodiment, a ratchet ring is embedded on the inner wall of the first fastener body.
In one embodiment, a first inclined surface facing outwards is arranged between the upper end surface and the side wall surface of the first clamping hanging piece.
According to a second aspect of the invention, a pipe string is provided, which comprises one or more second clamping hanging pieces, and at least one second clamping hanging piece can realize clamping matching with the first clamping hanging piece of the vortex drainage gas production device, so that a vortex rod can be matched with the second clamping hanging piece to form a spiral flow passage at a groove.
Compared with the prior art, the vortex drainage gas production device has the advantages that the vortex drainage gas production device is provided with the spiral groove to form a spiral flow channel with the second clamping and hanging piece after the vortex drainage gas production device is lowered in, so that the movement mode of underground fluid can be changed when the underground fluid moves upwards, turbulent flow is converted into ordered vortex, gas-liquid two phases are separated, the pressure of a pipeline is reduced, the energy attenuation speed of the fluid is reduced, and the flow friction and the slippage loss of an oil pipe are effectively reduced. Moreover, the device and the second clamping and hanging piece form a drainage and gas production device, external energy is not needed in the drainage process, the operation is simple and convenient, and shaft bottom pollution cannot be caused. Simultaneously, in the work progress, can with can be with the pit shaft of going into earlier with complex second card pendant, when needing drainage gas production, just go into this vortex drainage gas production device. And the second clamping hanging piece is cylindrical, and the inner diameter of the second clamping hanging piece is consistent with that of an oil pipe connected with the second clamping hanging piece, so that the inner drift diameter of the pipe column and the later-stage gas well operation are not influenced. In addition, the vortex water drainage gas production device is matched with a pipe column which is put in firstly through clamping connection, the structure is simple, and the connection is reliable.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 shows a schematic representation of a run-in condition of a vortex drainage gas production apparatus according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a vortex drainage gas production apparatus in a post-head-out state according to an embodiment of the present invention;
FIG. 3 shows a schematic view of a fishing vortex rod state of a vortex drainage gas production apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the operation of a first fishing clip of the vortex drainage gas production device according to one embodiment of the present invention;
in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
FIG. 1 shows a vortex drainage gas production apparatus 100 according to the present invention. As shown in fig. 1, the device 100 includes an upper joint 1, an eddy current bar 2, and a first clip member 4. Wherein the upper joint 1 mainly plays a role of connection for connecting with other tools. The vortex pole 2 is fixedly arranged at the lower end of the upper joint 1, and a spiral groove 21 is arranged on the outer wall of the upper end of the vortex pole. The groove 21 is used to form a spiral flow passage with the outer wall of the second hanger 200 (described in detail later) after the device 100 is lowered into a shaft during drainage and gas production. The first clamping hanger 4 is sleeved on the outer wall of the lower end of the vortex rod 2 below the groove 21 and is used for being matched with the second clamping hanger 200, so that clamping is achieved to limit the position of the vortex water drainage and gas production device 100.
The invention also relates to a pipe string. As shown in fig. 1, the pipe string includes a second hanger 200. The second hooking member 200 has a cylindrical structure, and a second hooking portion 201 is formed on an inner wall thereof. During construction, the second hanger 200 is first lowered into the wellbore following the pipe string. One or more second clamping hangers 200 can be arranged on the pipe column according to construction requirements, so that a tool such as the vortex drainage gas production device 100 is put into the pipe column to be clamped and matched with the second clamping hangers 200 in the process of producing the gas. This also ensures that different tools are run at different times to match the second catch 200 at the appropriate location downhole, or that multiple different tools are run at the same time to match the second catch 200 at different locations.
In the construction process, the second tubular hanger 200 is set on the pipe string and is first lowered into the wellbore along with the pipe string. After fracturing construction is completed, the vortex drainage gas production device 100 is lowered into the pipe column according to the production management requirement of the oil-gas well. In this manner, the vortex drainage gas production device 100 does not affect other gas well operations. Meanwhile, the vortex water drainage gas production device 100 is put in after, so that the full drift diameter of the pipe column is not influenced. In addition, the vortex drainage gas production device 100 is connected with the second clamping piece 200 in a clamping and hanging mode, so that the connection stability is guaranteed, and the requirement for well deviation is lowered. In addition, after the vortex drainage gas production device 100 is put in, the vortex rod 2 is matched with the second clamping piece 200 to form a spiral flow channel at the groove 21, so that the passing fluid generates vortex benefits, gas-liquid two phases are separated, the pressure drop of a pipeline is reduced, the attenuation speed of fluid energy is reduced, the original vertical upward turbulent flow state can be changed into spiral upward vortex laminar flow with the flow sectional area of the fluid reduced, the flow friction and the slippage loss of an oil pipe are effectively reduced, and the recovery ratio of a gas well is improved. Furthermore, according to the present invention, a plurality of second hangers 200 may be provided on the string, and a plurality of devices 100 may be lowered at a later stage to be respectively engaged with the corresponding second hangers 200, thereby extending and adjusting the length of the spiral flow path to meet the gas production needs.
In one embodiment, a liquid-expandable sealing strip 23 is embedded in the partition wall 22 of the groove 21. Preferably, the weather strip 23 is made of an expanded rubber made of a water-soluble polyurethane expanding agent. During run in of the apparatus 100, the seal 23 is not sufficiently expanded so that the apparatus 100 can be run smoothly into the interior cavity of the pipe string. After the device 100 is put in place, the sealing strip 23 is fully expanded to seal the gap between the partition wall 22 and the second fastener 200, so that the sealing performance of the spiral flow channel is ensured, and the drainage and gas production effects are further ensured.
Structurally, a helically extending receiving groove 24 is provided in the partition wall 22 for receiving a sealing strip 23 which expands in the presence of liquid. Preferably, a holder (not shown) is provided on the open-end groove wall of the accommodating groove 24, and the holder is extended oppositely on the both-end groove walls but is not closed. That is, the receiving groove 24 has a T-shaped cross section and is narrower near the open end. In a matching manner, a sealing strip 23 having a T-shaped cross section is inserted into the accommodating groove 24. This setting mode can guarantee the holding tank 24 and the sealing strip 23 be connected fastness, avoids sealing strip 23 to drop and influences sealed effect. For example, the sealing strip 23 may be bonded in the receiving groove 24 in order to further enhance the connection firmness.
In one embodiment, the vortex rod 2 has a first section 26 and a second section 27. Wherein the groove 21 is provided on the outer wall of the first section 26. And the second section 27 is located at the lower end of the first section 26 and is fixedly connected thereto. And the diameter dimension of the outer wall of the second section 27 is reduced relative to the diameter dimension of the outer wall of the first section 26. The second section 27 extends downwards, the upper section of which is in clearance fit with the first catch 4 and the lower section of which is connected to the first catch 4 by means of the first shear pin 8. During the lowering of the device 100, the second section 27 is arranged to have a clearance with the elastic claw 42 of the first hooking member 4, without affecting the radial retraction of the elastic claw 42. At the same time. Since the second section 27 is connected to the first clip member 4 by the first shear pin 8, the first shear pin 8 can be sheared during lifting the vortex rod 2, thereby releasing the fixed connection between the vortex rod 2 and the first clip member 4.
Preferably, a transition bevel 28 is provided between the first section 26 and the second section 27. This arrangement on the one hand avoids stress concentrations and thus fractures of the swirl rod 2 there. On the other hand, the transition slope 28 plays a role of drainage to introduce the fluid below into the spiral flow channel, so as to better realize the effects of water drainage and gas production.
In one embodiment, the second section 27 is configured in a cylindrical shape, and a communication hole 29 communicating inside and outside is configured on a side wall thereof. The lower end of the second section 27 communicates with the inner cavity of the first clip member 4. The fluid enters the inner cavity of the second section 27 through the inner cavity of the first clamping hanging piece 4, enters the annular space between the second section 27 and the elastic claw 42 through the communication hole 29, and then enters the spiral flow passage through the guide of the transition inclined plane 28. The arrangement can increase the flow area, thereby ensuring the effective flow of fluid and improving the gas production efficiency.
In one embodiment, the first clip member 4 includes a first clip member body 41, an elastic claw 42, and a first clip portion 43. The first fastener body 41 is cylindrical and is sleeved on the outer side of the lower end of the vortex rod 2. The elastic claw 42 extends axially upward from the first catch member body 41. A plurality of elastic claws 42 are provided at intervals in the circumferential direction. The elastic claw 42 is fitted into the second segment 27 with a clearance. The first catching portion 43 is provided on the outer peripheral wall of the elastic claw 42 and is configured as a radially protruding boss. Preferably, in order to increase the hooking stability, a plurality of spaced first hooking portions 43, for example, two, are provided in the axial direction. Correspondingly, the second hooking portion 201 is configured as a groove for mating with the first hooking portion 43. During the process of inserting the device 100, the first hooking portion 43 is forced to radially contract the elastic claw 42, so as to ensure the device 100 is inserted smoothly. When the first hooking portion 43 reaches the position of the second hooking portion 201, under the action of its own elasticity, the elastic claw 42 expands radially, so that the first hooking portion 43 enters the second hooking portion 201 and completes hooking to fix the device 100. The clamping and hanging structure is simple and easy to realize. In addition, due to the above structural features, the unique correspondence of the snap fit of the first snap fastener 4 and the second snap fastener 200 can be realized by changing the number, position, size, and other structures of the first snap fastener 43 and the corresponding second snap fastener 201. A plurality of second hangers 200 having differently arranged second hangers 201 may be run into the wellbore, and during later construction, the apparatus 100 may be run to mate with the second hangers 200 in place. Thus, a plurality of devices 100 can be lowered to increase the drainage and gas recovery effect.
The outer wall of the upper joint 1 is provided with a first step surface 11, so that the cross-sectional area of the upper section of the upper joint 1 is larger than that of the lower section, as shown in fig. 3. The first step face 11 is used to achieve a snap fit with the fishing tool 400 to lift the top sub 1 and the vortex rod 3 when the device 100 is intended to be lifted out of the wellbore.
A ratchet seat 44 is fitted on an inner wall of the first hooking member body 41. It should be noted that, for the sake of simple production process, the first latch hanger body 41 may include two parts disposed axially up and down to form a groove for latching the ratchet seat 44. The ratchet socket 44 can mate with the ratchet 303 of the fishing device 300 to lift the first snap hanger 4 out of the wellbore, as shown in fig. 4. That is, when water drainage and gas production are not required, the device 100 can be lifted out of the shaft to realize full drift diameter, which is beneficial to smooth implementation of the later process.
An upwardly facing first inclined surface 45 is provided between the upper end surface and the outer side surface of the elastic claw 42. The first ramp 45 is used to mate with a fishing device 300 during fishing (discussed in detail below).
The apparatus 100 further comprises a delivery head 3 arranged at the upper end of the upper head 1. The delivery head 3 is connected to the upper joint 1 by a second shear pin 9. After the apparatus 100 has been run in place, the running tool is lifted and the second shear pin 9 is sheared, and the delivery head 3 is lifted out of the wellbore, as shown in figure 2.
The invention also relates to a fishing device 300. As shown in fig. 4, the fishing device 300 includes a fishing head 301 and a fishing mandrel 302. The fishing head 301 is adapted to be connected to an external structure such that the external structure (e.g., coiled tubing) can be lowered into a predetermined position in the wellbore with the fishing apparatus 300. The fishing mandrel 302 is fixedly connected with the fishing head 301, and meanwhile, the fishing mandrel 302 can also be matched with the first clamping piece 4 positioned in the second clamping piece 200 in a locking manner. The fishing device 300 is lifted up to lift the first bail 4 out of the wellbore.
Specifically, a ratchet 303 is provided on the outer wall of the lower end of the fishing mandrel 302. In order to ensure the smooth matching and connection stability with the ratchet seat 44, a plurality of ratchets 303 are arranged on the outer wall of the lower end of the fishing mandrel 302. A plurality of ratchet teeth 303 are arranged side by side along the direction of extension of the fishing mandrel 302.
The lower end surface of the fishing head 301 is provided with a mounting groove 304. The upper end of the fishing mandrel 302 can extend into the mounting slot 304, such as by a threaded connection. The side walls of the mounting groove 304 are in clearance fit with the outer wall of the fishing mandrel 302. A second slope 305 is provided between the lower end surface of the mounting groove 304 and the inner wall surface. During the process of descending the fishing device 300, the second inclined surface 305 is inserted into an annular space formed by the first inclined surface 45 and the second clamping hanging piece 200, and along with the continuous descending of the fishing device 300, the second inclined surface 305 applies force to the first inclined surface 45 and actuates the elastic claw 42 to radially contract, so that the upper end of the elastic claw 42 is gathered in the installation groove 304, and meanwhile, the first clamping hanging part 43 is separated from the second clamping hanging part 201 to release clamping limitation.
The operation of the vortex drainage gas recovery device 100 and associated tubing string is discussed in detail below with respect to fig. 1-4.
First, the second clip 200 is set on the pipe string, and then the pipe string is run into the wellbore. After the gas well is put in place, the second clamping and hanging piece 200 is cylindrical, so that the operation of other gas wells is not influenced.
When water drainage and gas production are needed, the vortex water drainage and gas production device 100 is lowered into the pipe column through the coiled tubing. During the process of descending the vortex drainage gas production device 100, the elastic claws 42 radially contract and do not prevent the vortex drainage gas production device 100 from descending. When the first hooking portion 43 reaches the position of the second hooking portion 201, under the action of its own elasticity, the elastic claw 42 radially expands, so that the first hooking portion 43 and the second hooking portion 201 complete hooking, so as to fix the vortex drainage gas production device 100, as shown in fig. 1. At this point, the sealing strip 23 expands against the fluid, thereby sealing off the annulus between the vortex rod 2 and the second clip member 200.
The tool is then lifted up and when the pressure reaches a certain value the second shear pin 9 is sheared off, as shown in figure 2. The delivery head 3 is lifted out of the wellbore. At this time, the first clip member 4 is disposed at a predetermined position. The fluid rises through the spiral flow passage.
When water drainage and gas production are not needed, the fishing tool 400 is firstly put in. As shown in fig. 3, the fishing teeth 401 of the fishing tool 400 are engaged with the first step surface 11 of the upper connector 1. During the lifting process, the first shearing pin 8 is sheared, and the upper connector 1 drives the vortex rod 2 to be lifted.
Then, the fishing device 300 is used to fish the first clamp 4 out of the pipe column to realize the full drift diameter. Specifically, the fishing device 300 is lowered, and the fishing device 300 is pressed down. During the downward movement of the fishing device 300, the ratchet teeth 303 of the fishing device 300 engage the ratchet socket 44 of the device 100 to form a locking arrangement. Meanwhile, the second inclined surface 305 applies force to the first inclined surface 45, and the elastic claw 42 is actuated to contract radially, so that the clamping limitation of the first clamping hanging piece 4 and the second clamping hanging piece 200 is released. Thus, the first bail 4 may be lifted out of the wellbore by lifting the fishing device 300. To this end, the apparatus 100 is proposed to achieve full bore.
In the present application, the terms "upper" and "lower" are used with reference to the actual operating orientation of the vortex drainage gas recovery device 100.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A vortex drainage gas production device, comprising:
an upper joint is arranged on the upper end of the connecting rod,
a vortex rod fixedly arranged at the lower end of the upper joint, a spiral groove is arranged on the outer wall of the upper end of the vortex rod,
the first clamping and hanging piece is sleeved on the outer wall of the lower end of the vortex rod below the groove.
2. The vortex water drainage gas production device according to claim 1, wherein a liquid expansion sealing strip is embedded in the partition wall of the groove.
3. The vortex drainage gas production device according to claim 2, wherein a receiving groove for receiving the liquid-swelling sealing strip is provided in the partition wall, and a holding portion extending from the two groove walls in an unclosed opposing manner is provided at an opening end of the receiving groove.
4. The vortex drainage gas recovery device according to any one of claims 1 to 3, wherein the vortex rod has:
the outer wall of the spiral groove is provided with a first section of the spiral groove,
a second segment fixedly connected to the first segment, the second segment having an outer wall with a reduced diametrical dimension relative to the first segment,
the upper section of the second section is in clearance fit with the first clamping hanging piece, and the lower section of the second section is connected with the first clamping hanging piece through a first shearing pin.
5. The vortex water drainage gas recovery device of claim 4 wherein a transition chamfer is provided between the first section and the second section.
6. The vortex water drainage gas production device according to claim 4 or 5, wherein the second section is configured in a cylindrical shape capable of communicating with the inner cavity of the first hook, and a communication hole communicating inside and outside is configured on a side wall thereof.
7. The vortex water drainage gas production device according to any one of claims 4 to 6, wherein the first hooking member includes a first hooking member body connected to a lower section of the second section, circumferentially spaced elastic claws extending axially upward from the first hooking member body, and first hooking portions provided on an outer peripheral wall of the elastic claws.
8. The vortex water drainage gas production device according to claim 7, wherein a ratchet ring is embedded on the inner wall of the first hanger body.
9. The vortex water drainage gas production device according to claim 8, wherein a first slope facing outward is provided between an upper end surface and a side wall surface of the first hook.
10. A pipe string comprising one or more second catches, and at least one of the second catches is snap-fittable with a first catch of a vortex drainage gas recovery device according to any of claims 1 to 9, such that the vortex rod is cooperable with the second catch to form a helical flow path at a recess.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910687841.7A CN112302591A (en) | 2019-07-29 | 2019-07-29 | Vortex drainage gas production device and tubular column |
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| CN201910687841.7A CN112302591A (en) | 2019-07-29 | 2019-07-29 | Vortex drainage gas production device and tubular column |
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| CN201910687841.7A Pending CN112302591A (en) | 2019-07-29 | 2019-07-29 | Vortex drainage gas production device and tubular column |
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| CN107387038A (en) * | 2017-08-24 | 2017-11-24 | 西安石油大学 | A kind of water pumping gas production meet the eye on every side vortex instrument with underground |
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Application publication date: 20210202 |