CN116357274B - Natural gas well rodless pump and foam drainage gas production composite process - Google Patents
Natural gas well rodless pump and foam drainage gas production composite process Download PDFInfo
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- CN116357274B CN116357274B CN202310636503.7A CN202310636503A CN116357274B CN 116357274 B CN116357274 B CN 116357274B CN 202310636503 A CN202310636503 A CN 202310636503A CN 116357274 B CN116357274 B CN 116357274B
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- 239000007789 gas Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 239000006260 foam Substances 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 239000002343 natural gas well Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 16
- 230000008569 process Effects 0.000 title claims description 16
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 238000009825 accumulation Methods 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000012530 fluid Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000004088 foaming agent Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000000945 filler Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000006265 aqueous foam Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- 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
Abstract
The invention relates to a natural gas well rodless pump and foam drainage gas production composite technology, which relates to the field of shale gas exploitation, and comprises the following steps of connecting an oil pipe provided with an automatic reversing valve with a rodless pump, and installing the oil pipe under a well for working; when the liquid-gas ratio is high, starting a rodless pump to enable the accumulated liquid of the shaft to be discharged to the ground through an automatic reversing valve and an oil pipe; when the liquid-gas ratio is small or the rodless pump generates air lock, the rodless pump is closed, the automatic reversing valve senses pressure change and is automatically opened, so that the oil pipe is communicated with a pipeline connected with the automatic reversing valve, and the oil pipe is isolated from the rodless pump; the invention solves the problems of difficult liquid drainage of high-yield liquid well, serious liquid accumulation well, flooded well, blowout well, long-term well stop, low-pressure low-yield well, new well with low stratum energy and the like, and improves the yield and recovery ratio of the gas well.
Description
Technical Field
The invention relates to the technical field of shale gas exploitation, in particular to a natural gas well rodless pump and foam drainage gas exploitation composite process.
Background
The conventional gas well drainage gas production process comprises a foam drainage gas production process, a speed pipe column drainage gas production process, a compressor gas lift process, a machine pump process, a plunger gas lift process, an electric submersible pump process and the like, and the working principle and the adaptability of the gas well drainage gas production process and the speed pipe column drainage gas production process are greatly different. Because of the limitations of gas production, drainage, wellbore geometry, bottom hole pressure, reservoir temperature, fluid composition, surface manifold, economic cost, power conditions, gas source required for gas lift, whether sand is produced, etc., each drainage and gas production process technology has certain limitations. When the formation pressure of the gas field is further reduced, the effect is poorer and worse by means of a single drainage gas production process, and long-time continuous drainage cannot be realized.
Therefore, in order to overcome the above disadvantages, a composite process of a natural gas well rodless pump and foam drainage gas production needs to be provided.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problem that the conventional single drainage gas production mode cannot continuously drain liquid when the formation pressure of a gas field is reduced.
(II) technical scheme
In order to solve the technical problems, the invention provides a natural gas well rodless pump and foam drainage gas production composite process, which comprises the following steps,
i, connecting an oil pipe provided with an automatic reversing valve with a rodless pump, and installing the oil pipe under a well to work; when the liquid-gas ratio is high, starting a rodless pump to enable the accumulated liquid of the shaft to be discharged to the ground through an automatic reversing valve and an oil pipe;
when the liquid-gas ratio is small or the rodless pump generates an airlock, the rodless pump is closed, the automatic reversing valve senses pressure change and is automatically opened, so that an oil pipe is communicated with a pipeline connected with the automatic reversing valve, and the oil pipe is isolated from the rodless pump;
and III, allowing the mixture of the shaft liquid and the gas to enter an oil pipe through an automatic reversing valve, and simultaneously injecting fluid into the pipeline to mix the shaft liquid and the fluid, wherein the surface tension and the density of the liquid of the shaft liquid are reduced so as to be carried to the ground from the bottom by the bottom hole airflow.
As a further illustration of the invention, it is preferred that the rodless pump be shut off after a period of time for which the tubing and annulus are automatically connected and production by tubing self-injection occurs if the well is capable of being revived for a period of time.
As a further explanation of the present invention, it is preferable that the rodless pump is an electric submersible pump, the fluid is injected into the automatic directional valve through a pipe, or is led out of the rodless pump through a pipe, or is led out of the automatic directional valve through a pipe, and the fluid is a foaming agent.
As a further explanation of the present invention, it is preferable that the automatic reversing valve includes a valve body, a side pipe, a side water inlet, a filler nozzle, a main valve and an auxiliary valve, both ends of the hollow valve body are respectively connected with an outlet end of the rodless pump and an inlet end of the oil pipe, the side pipe is fixedly connected to one side of the valve body and both ends thereof are respectively communicated with both ends of the valve body, the side water inlet is provided on one side of the middle of the valve body, the filler nozzle is provided on the other side of the middle of the valve body, the main valve is slidingly connected to the middle of the valve body so as to be communicated or closed between the outlet of the rodless pump and the side pipe, between the side water inlet and the auxiliary valve, and between the filler nozzle and the auxiliary valve, and the auxiliary valve is slidingly connected to the middle of the valve body so as to be communicated or closed between the oil pipe and the side water inlet and the filler nozzle.
As a further explanation of the present invention, preferably, the main valve is in a cylindrical rod shape and has a diameter smaller than the diameter of the inner cavity of the valve body, and a disc-shaped bottom valve plate is fixedly connected to the bottom end of the main valve, and the outer diameter of the bottom valve plate is the same as the diameter of the inner cavity of the valve body; the middle part of the main valve is fixedly connected with a middle valve plate, the inner cavity of the valve body is fixedly connected with a lower limit plate, a main spring is fixedly connected between the middle valve plate and the lower limit plate, and the main spring pushes the middle valve plate so that the bottom valve plate is positioned between the side pipe opening and the rodless pump outlet.
As a further explanation of the present invention, it is preferable that the outer diameter of the middle valve plate is the same as the diameter of the inner cavity of the valve body, and the middle aperture of the lower limit plate is the same as the outer diameter of the main valve so that the top of the main valve passes through the lower limit plate.
As a further explanation of the present invention, preferably, a disc-shaped top valve plate is fixedly connected to the top of the main valve, the outer diameter of the top valve plate is the same as the diameter of the inner cavity of the valve body, the top valve plate is located between the water inlet and the rodless pump when the main spring is extended, and the top valve plate is located between the water inlet and the auxiliary valve when the main spring is contracted.
As a further explanation of the invention, preferably, the auxiliary valve is in a cylindrical rod shape and has an outer diameter smaller than the diameter of the inner cavity of the valve body, the bottom end of the auxiliary valve is fixedly connected with a disc-shaped lower valve plate, the outer diameter of the lower valve plate is equal to the diameter of the inner cavity of the valve body, and a plurality of valve holes are formed in the middle of the lower valve plate at intervals; an inner cavity of the valve body above the water inlet is fixedly connected with an upper limit plate, an auxiliary spring is fixedly connected between the lower valve plate and the upper limit plate, the top end of the auxiliary valve penetrates through the upper limit plate and is fixedly connected with the upper valve plate, and the outer diameter of the upper valve plate is smaller than the diameter of the inner cavity of the valve body and larger than the diameter of a middle hole of the upper limit plate; the secondary spring is extended to enable the upper valve plate to be abutted with the upper limit plate.
As a further explanation of the invention, preferably, a cylindrical oil outlet pipe is fixedly connected between the valve hole and the auxiliary spring at the upper part of the lower valve plate, the outer diameter of the oil outlet pipe is the same as the diameter of the middle hole of the upper limiting plate, the outer wall surface of the oil outlet pipe is always attached to the middle hole wall of the upper limiting plate, and a flow passage is arranged between the top of the oil outlet pipe and the bottom end surface of the upper valve plate.
As a further explanation of the present invention, it is preferable that the rodless pump is activated so that the bottom valve plate is pushed up by the bottom hole liquid accumulation, and the bottom hole liquid accumulation enters the side pipe to flow to the oil pipe while the upper valve plate blocks the space between the side water inlet and the sub valve; the rodless pump is closed, the main spring resets the space between the closed side pipe and the rodless pump and opens the space between the side inlet and the auxiliary valve, the bottom hole effusion automatically enters the valve body through the side inlet, then fluid is injected into the injection pipe orifice through the pipeline to be mixed with the bottom hole effusion, and the mixture pushes the upper valve plate through the valve hole so that the mixture flows into the oil pipe through the oil outlet pipe and the runner.
(III) beneficial effects
The technical scheme of the invention has the following advantages:
the invention adopts two drainage gas production processes to meet, uses the rodless pump to discharge the accumulated liquid of the shaft in the early stage, adopts foam drainage gas production in the later stage, so that the drainage gas production can be realized even when the rodless pump is in gas lock, and the two process modes can be automatically switched by utilizing the automatic reversing valve, so that additional control equipment and detection equipment are not needed, and the control cost is reduced.
Drawings
FIG. 1 is a front view of the device installation of the present invention;
FIG. 2 is a rear view of the device installation of the present invention;
FIG. 3 is a cross-sectional view of the automatic reversing valve rodless pump of the present invention in a drainage and production operating state;
FIG. 4 is an enlarged view of A in FIG. 3;
FIG. 5 is a sectional view of the foam drainage and gas production operation state of the automatic reversing valve of the invention;
fig. 6 is an enlarged view of B in fig. 5.
In the figure: 1. a rodless pump; 2. an automatic reversing valve; 20. a valve body; 21. a side pipe; 22. a side inlet; 23. a pouring nozzle; 24. a main valve; 241. a bottom valve plate; 242. a middle valve plate; 243. a main spring; 244. a top valve plate; 25. a lower limiting plate; 26. a sub-valve; 261. a lower valve plate; 262. a valve hole; 263. a secondary spring; 264. an upper valve plate; 265. an oil outlet pipe; 27. an upper limit plate; 271. a flow passage; 3. and (5) an oil pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The natural gas well rodless pump and foam drainage gas production composite process, combined with fig. 1 and 2, comprises the following steps:
and I, connecting an oil pipe 3 provided with an automatic reversing valve 2 with the rodless pump 1, and installing the oil pipe in the underground for working.
When the liquid-gas ratio is high, the rodless pump 1 is started to enable the wellbore accumulated liquid to be discharged to the ground through the automatic reversing valve 2 and the oil pipe 3, and the rodless pump 1 can be used for discharging a great amount of accumulated liquid at the bottom of the well, reducing the bottom-hole flowing pressure and activating the stratum gas-liquid flow. After the accumulated liquid in the well bore is discharged, the stratum and the well bore recover gas-liquid flow, the liquid yield of the gas well is reduced, and the stratum energy is recovered.
After the rodless pump 1 is drained for a period of time, the rodless pump is closed, so that the oil pipe and the annulus are automatically communicated, and if the gas well can be revived for a period of time, the gas well is produced by self-injection through the oil pipe 3. And the production of the oil pipe or the casing pipe can be determined according to the productivity condition, and the maximum liquid carrying self-injection production of the gas well is maintained to the greatest extent.
When the liquid-gas ratio is small or the rodless pump generates an airlock, the rodless pump 1 is closed, the automatic reversing valve 2 senses pressure change and is automatically opened, so that the oil pipe 3 is communicated with a pipeline connected with the automatic reversing valve 2, and the oil pipe 3 is isolated from the rodless pump 1 under the limitation of the automatic reversing valve 2;
and III, automatically flowing the liquid in the shaft into the automatic reversing valve 2, simultaneously injecting fluid capable of reducing the liquid in the shaft into the pipeline, mixing the liquid in the shaft with the fluid, reducing the surface tension and density of the liquid in the shaft, reducing the gas flow slip loss in the shaft, improving the gas flow liquid lifting capacity, and bringing the liquid in the bottom of the shaft to the ground.
The rodless pump 1 is a rodless pumping device which uses a cable or high-pressure liquid to transfer energy, and an electric submersible pump or an electric submersible screw pump is preferred in the scheme. Besides being injected into the automatic reversing valve 2 through a pipeline, the fluid can be led to the rodless pump 1 through a pipeline and also can be led to the automatic reversing valve 2 through a pipeline, namely, the fluid can be directly injected into the rodless pump 1, the automatic reversing valve 2 and the space between the oil pipe 3 and the shaft. Preferably, the fluid is injected into the automatic directional valve 2. The automatic reversing valve 2 can be composed of a plurality of groups of conventional on-off valves, but needs to be combined with an additional controller and a detector for controlling the opening and closing of the valve to switch the flow direction of the bottom hole effusion and the detection of the well bore effusion pressure. The scheme adopts a newly designed automatic reversing valve 2. Referring to fig. 3 and 4, the preferred automatic reversing valve 2 in this embodiment includes a valve body 20, a side pipe 21, a side inlet 22, a filler pipe orifice 23, a main valve 24 and an auxiliary valve 26, two ends of the hollow valve body 20 are respectively connected to an outlet end of the rodless pump 1 and an inlet end of the oil pipe 3, and the side pipe 21 is fixedly connected to one side of the valve body 20 and two ends are respectively communicated with two ends of the valve body 20. The maximum width of the side pipe 21 and the valve body 20 is smaller than or equal to the diameter of the oil pipe 3, so that smooth falling into a shaft can be ensured without blocking. The side inlet 22 is arranged on one side of the middle part of the valve body 20, the injection pipe orifice 23 is arranged on the other side of the middle part of the valve body 20, and the side inlet 22 and the injection pipe orifice 23 are flange pipe orifices and are positioned on the same water surface. A main valve 24 is slidably coupled to the middle of the valve body 20, and a sub-valve 26 is slidably coupled to the middle of the valve body 20 above the main valve 24.
Referring to fig. 3 and 5, the main valve 24 is cylindrical rod-shaped and has a diameter smaller than the diameter of the inner cavity of the valve body 20, a disc-shaped bottom valve plate 241 is fixedly connected to the bottom end of the main valve 24, and the outer diameter of the bottom valve plate 241 is the same as the diameter of the inner cavity of the valve body 20. The middle valve plate 242 is fixedly connected to the middle part of the main valve 24, the lower limit plate 25 is fixedly connected to the inner cavity of the valve body 20, the lower limit plate 25 is of an annular plate structure, the outer diameter of the middle valve plate 242 is the same as the diameter of the inner cavity of the valve body 20, and the aperture of the middle part of the lower limit plate 25 is the same as the outer diameter of the main valve 24 so that the top of the main valve 24 passes through the lower limit plate 25. A main spring 243 is fixedly connected between the middle valve plate 242 and the lower limit plate 25, and the main spring 243 pushes the middle valve plate 242 to enable the bottom valve plate 241 to be positioned between the opening of the side pipe 21 and the outlet of the rodless pump 1, and at the moment, the outlet of the rodless pump 1 is sealed with the side pipe 21.
When the pressure of the accumulated liquid in the shaft or the pressure of the outlet of the rodless pump 1 is larger than the elastic force of the main spring 243, the accumulated liquid in the shaft pushes up the bottom valve plate 241, the outlet of the rodless pump 1 is communicated with the side pipe 21, and the accumulated liquid in the shaft can flow into the oil pipe 3 along the side pipe 21 and then flow to the ground along the oil pipe 3 to finish liquid discharge. When the pressure of the well bore liquid is smaller than the elastic force of the main spring 243, the main spring 243 pushes the middle valve plate 242 to push the bottom valve plate 241 back to the original position, so that the outlet of the rodless pump 1 is sealed with the side pipe 21, and the subsequent well bore liquid cannot flow into the rodless pump 1 from the side pipe 21. In addition, the middle valve plate 242 with the outer diameter the same as the inner diameter of the valve body 20 is designed, and the lower limit plate 25 is matched to ensure that the accumulated liquid in the shaft is not easy to contact with the main spring 243, so that the influence on the service life of the automatic reversing valve 2 caused by the corrosion of the main spring 243 is avoided.
Referring to fig. 3 and 4, a disk-shaped top valve plate 244 is fixedly connected to the top of the main valve 24, the outer diameter of the top valve plate 244 is the same as the diameter of the inner cavity of the valve body 20, the top valve plate 244 is located between the water inlet 22 and the rodless pump 1 when the main spring 243 is extended, and the top valve plate 244 is located between the water inlet 22 and the auxiliary valve 26 when the main spring 243 is contracted. Through the arrangement, when the rodless pump 1 works, more gravel mixed with shaft liquid with high pressure can be prevented from entering the auxiliary valve 26 through the side inlet 22, the auxiliary valve 26 is prevented from being impacted by the gravel and the shaft liquid, the service life of the auxiliary valve 26 is prolonged, meanwhile, when the main spring 243 is reset, the auxiliary valve plays a role of a one-way valve, the shaft liquid and fluid flowing in through the injection pipe orifice 23 are prevented from pushing the main valve 24 to pull the main spring 243, the shaft liquid is prevented from penetrating into the environment where the main spring 243 is located, and the protection of the main spring 243 is improved. Meanwhile, the elastic force of the main spring 243 is utilized to automatically control the opening and closing according to the pressure of accumulated liquid in a shaft, so that the automatic reversing valve 2 omits the traditional arrangement of a control motor, a pressure sensor and a cable, the control cost is reduced, and the auxiliary valve 26 and the main spring 243 can be protected by designing the top valve plate 244.
Referring to fig. 4 and 6, the auxiliary valve 26 is in a cylindrical rod shape, the outer diameter of the auxiliary valve is smaller than the diameter of the inner cavity of the valve body 20, a disc-shaped lower valve plate 261 is fixedly connected to the bottom end of the auxiliary valve 26, the outer diameter of the lower valve plate 261 is equal to the diameter of the inner cavity of the valve body 20, and a plurality of valve holes 262 are formed in the middle of the lower valve plate 261 at intervals; an upper limit plate 27 is fixedly connected to the inner cavity of the valve body 20 above the water inlet 22, a secondary spring 263 is fixedly connected between the lower valve plate 261 and the upper limit plate 27, an upper valve plate 264 is fixedly connected to the top end of the secondary valve 26 through the upper limit plate 27, and the outer diameter of the upper valve plate 264 is smaller than the diameter of the inner cavity of the valve body 20 and larger than the diameter of a middle hole of the upper limit plate 27; the sub spring 263 expands to bring the upper valve plate 264 into abutment with the upper limit plate 27. The upper part of the lower valve plate 261 is fixedly connected with a cylindrical oil outlet pipe 265 between the valve hole 262 and the auxiliary spring 263, the outer diameter of the oil outlet pipe 265 is the same as the diameter of the middle hole of the upper limiting plate 27, the outer wall surface of the oil outlet pipe 265 is always attached to the middle hole wall of the upper limiting plate 27, and a flow passage 271 is arranged between the top of the oil outlet pipe 265 and the bottom end surface of the upper valve plate 264.
After the rodless pump 1 is turned off, the main spring 243 resets the space between the closed side pipe 21 and the rodless pump 1 and opens the space between the side inlet 22, the filler pipe orifice 23 and the auxiliary valve 26, the bottom hole effusion automatically enters the valve body 20 through the side inlet 22, the filler pipe orifice 23 is connected with a pipe extending to the surface wellhead, and then the filler pipe orifice 23 is injected with a fluid, preferably a foaming agent, through the pipe to be mixed with the bottom hole effusion. By stirring the natural gas flow, the foaming agent is fully contacted with the bottom-hole effusion to generate a large amount of relatively stable low-density aqueous foam mixture, and the mixture generates various physical-chemical effects such as foam, dispersion, drag reduction, washing and the like in the gas-liquid two-phase mixed vertical flow process, so that the slip loss in a shaft is reduced, and the gas-liquid lifting capacity is improved. The foam mixture then pushes open upper valve plate 264 through valve orifice 262 to allow the mixture to flow into oil line 3 via outlet line 265 and flow passage 271, where part flows between bottom valve plate 241 and middle valve plate 242 through side tube 21, but under the restriction of top valve plate 244, protects main spring 243 from tension.
By arranging the lower valve plate 261 with the valve hole 262 and the oil outlet pipe 265, the corrosion of the foam mixture to the auxiliary spring 263 can be avoided, the auxiliary spring 263 is ensured to have a longer service life, meanwhile, under the limit of the upper valve plate 264, the auxiliary valve 26 also has the function of a one-way valve, and the situation that the accumulated liquid of a shaft flowing out of the side pipe 21 flows out of the valve body 20 from the side water inlet 22 through the auxiliary valve 26 is avoided, so that the rodless pump 1 can normally drain is ensured. In addition, since the valve hole 262 is downward and the pressure of the mixture is small, even though the gravel enters through the side inlet 22, the filling nozzle 23 always flows the liquid, and the gravel on the valve hole 262 can be washed away to avoid blockage regardless of whether the secondary spring 263 is reset.
In summary, the novel automatic reversing valve 2 is designed, so that extra electric control cost is saved, and the automatic opening and closing of different valve positions are realized only by means of the elasticity of the spring and the pressure difference of the accumulated liquid at the bottom of the well, so that the automatic reversing valve is very practical. Meanwhile, the automatic switching of two technological measures of drainage gas production and foam drainage gas production of the rodless pump 1 can be realized, and the foaming agent is directly injected into the automatic reversing valve 2 through a pipeline. By implementing this scheme in some flooded wells, successful activation and continuous production is achieved with daily gas production of gas wells up to tens of thousands of meters per day, accumulating amounts of production gas up to millions or even thousands of meters. The scheme is implemented in a gas well with large water yield, daily yield can be improved to the average value of ten thousand square per day, and the improvement effect is very excellent.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A natural gas well rodless pump and foam drainage gas production composite process is characterized in that: comprises the steps of,
i, connecting an oil pipe (3) provided with an automatic reversing valve (2) with a rodless pump (1), and installing the oil pipe in the pit for working; when the liquid-gas ratio is high, starting the rodless pump (1) to enable the wellbore accumulated liquid to be discharged to the ground through the automatic reversing valve (2) and the oil pipe (3); the automatic reversing valve (2) comprises a valve body (20), a side pipe (21), a side water inlet (22), a pouring nozzle (23), a main valve (24) and an auxiliary valve (26), wherein two ends of the hollow valve body (20) are respectively connected with the outlet end of the rodless pump (1) and the inlet end of the oil pipe (3), the side pipe (21) is fixedly connected to one side of the valve body (20) and two ends of the side pipe are respectively communicated with two ends of the valve body (20), the side water inlet (22) is arranged on one side of the middle of the valve body (20), the pouring nozzle (23) is arranged on the other side of the middle of the valve body (20), and the main valve (24) is slidably connected to the middle of the valve body (20) so that the outlet of the rodless pump (1) is communicated with the side water inlet (21), the pouring nozzle (23) is communicated with or sealed with the auxiliary valve (26), and the auxiliary valve (26) is slidably connected to the middle of the valve body (20) so that the oil pipe (3) is communicated with the side water inlet (22) and the pouring nozzle (23) is sealed;
when the liquid-gas ratio is small or the rodless pump generates an airlock, the rodless pump (1) is closed, the automatic reversing valve (2) senses pressure change and is automatically opened, so that an oil pipe is communicated with a pipeline connected with the automatic reversing valve (2), and the oil pipe (3) is isolated from the rodless pump (1);
and III, a mixture of the shaft liquid and the gas enters an oil pipe (3) through an automatic reversing valve (2), and meanwhile, fluid is injected into the pipeline to mix the shaft liquid and the fluid, wherein the fluid is a foaming agent, and the surface tension and the density of the liquid of the shaft liquid are reduced to be brought to the ground from the bottom hole by bottom hole airflow.
2. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 1, wherein the process is characterized in that: after the rodless pump (1) is drained for a period of time, the rodless pump (1) is closed to automatically communicate the oil pipe (3) with the annulus, and if the gas well can be revived for a period of time, the gas well is produced by self-injection through the oil pipe (3).
3. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 1, wherein the process is characterized in that: the rodless pump (1) is an electric submersible pump, and fluid is injected into the automatic reversing valve (2) through a pipeline, or is led out of the rodless pump (1) through the pipeline, or is led out of the automatic reversing valve (2) through the pipeline.
4. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 1, wherein the process is characterized in that: the main valve (24) is in a cylindrical rod shape and has a diameter smaller than the diameter of the inner cavity of the valve body (20), the bottom end of the main valve (24) is fixedly connected with a disc-shaped bottom valve plate (241), and the outer diameter of the bottom valve plate (241) is the same as the diameter of the inner cavity of the valve body (20); the middle part of the main valve (24) is fixedly connected with a middle valve plate (242), the inner cavity of the valve body (20) is fixedly connected with a lower limit plate (25), a main spring (243) is fixedly connected between the middle valve plate (242) and the lower limit plate (25), and the main spring (243) pushes the middle valve plate (242) to enable the bottom valve plate (241) to be positioned between an opening of the side pipe (21) and an outlet of the rodless pump (1).
5. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 4, wherein the composite natural gas well rodless pump and foam drainage and gas production process is characterized in that: the outer diameter of the middle valve plate (242) is the same as the diameter of the inner cavity of the valve body (20), and the aperture of the middle part of the lower limit plate (25) is the same as the outer diameter of the main valve (24) so that the top of the main valve (24) passes through the lower limit plate (25).
6. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 5, wherein the composite natural gas well rodless pump and foam drainage and gas production process is characterized in that: the top of the main valve (24) is fixedly connected with a disc-shaped top valve plate (244), the outer diameter of the top valve plate (244) is the same as the diameter of the inner cavity of the valve body (20), the top valve plate (244) is positioned between the side water inlet (22) and the rodless pump (1) when the main spring (243) stretches, and the top valve plate (244) is positioned between the side water inlet (22) and the auxiliary valve (26) when the main spring (243) contracts.
7. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 6, wherein the composite natural gas well rodless pump and foam drainage and gas production process is characterized in that: the auxiliary valve (26) is in a cylindrical rod shape, the outer diameter of the auxiliary valve is smaller than the diameter of the inner cavity of the valve body (20), a disc-shaped lower valve plate (261) is fixedly connected to the bottom end of the auxiliary valve (26), the outer diameter of the lower valve plate (261) is equal to the diameter of the inner cavity of the valve body (20), and a plurality of valve holes (262) are formed in the middle of the lower valve plate (261) at intervals; an inner cavity of the valve body (20) above the water inlet (22) is fixedly connected with an upper limit plate (27), an auxiliary spring (263) is fixedly connected between the lower valve plate (261) and the upper limit plate (27), the top end of the auxiliary valve (26) penetrates through the upper limit plate (27) to be fixedly connected with an upper valve plate (264), and the outer diameter of the upper valve plate (264) is smaller than the diameter of the inner cavity of the valve body (20) and larger than the diameter of a middle hole of the upper limit plate (27); the secondary spring (263) expands to bring the upper valve plate (264) into contact with the upper limit plate (27).
8. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 7, wherein the composite natural gas well rodless pump and foam drainage and gas production process is characterized in that: the upper part of the lower valve plate (261) is fixedly connected with a cylindrical oil outlet pipe (265) between the valve hole (262) and the auxiliary spring (263), the outer diameter of the oil outlet pipe (265) is the same as the diameter of the middle hole of the upper limiting plate (27), the outer wall surface of the oil outlet pipe (265) is always attached to the middle hole wall of the upper limiting plate (27), and a flow passage (271) is arranged between the top of the oil outlet pipe (265) and the bottom end surface of the upper valve plate (264).
9. The composite natural gas well rodless pump and foam drainage and gas production process according to claim 8, wherein the composite natural gas well rodless pump and foam drainage and gas production process is characterized in that: the rodless pump (1) is started to enable bottom liquid accumulation to push up the bottom valve plate (241), the bottom liquid accumulation enters the side pipe (21) to flow to the oil pipe (3), and meanwhile the upper valve plate (264) cuts off the space between the side water inlet (22) and the auxiliary valve (26); the rodless pump (1) is closed, the main spring (243) resets the space between the closed side pipe (21) and the rodless pump (1) and opens the space between the side water inlet (22) and the auxiliary valve (26), the bottom hole effusion automatically enters the valve body (20) through the side water inlet (22), then fluid is injected into the injection pipe orifice (23) through a pipeline to be mixed with the bottom hole effusion, and the mixture pushes the upper valve plate (264) away through the valve hole (262) so that the mixture flows into the oil pipe (3) through the oil outlet pipe (265) and the flow passage (271).
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| CN202310636503.7A CN116357274B (en) | 2023-06-01 | 2023-06-01 | Natural gas well rodless pump and foam drainage gas production composite process |
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| US20220349282A1 (en) * | 2019-09-16 | 2022-11-03 | Petrochina Company Limited | Permanent packer and extended gas lift method using permanent packer |
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| CN102297127A (en) * | 2010-06-24 | 2011-12-28 | 大庆石油管理局 | Self-discharge check valve special for oil extraction rodless pump of high sand content oil well |
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