CN111980647B - Unsteady-state steam injection method used during huff and puff and steam drive - Google Patents
Unsteady-state steam injection method used during huff and puff and steam drive Download PDFInfo
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- CN111980647B CN111980647B CN201910422037.6A CN201910422037A CN111980647B CN 111980647 B CN111980647 B CN 111980647B CN 201910422037 A CN201910422037 A CN 201910422037A CN 111980647 B CN111980647 B CN 111980647B
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 256
- 238000000034 method Methods 0.000 title claims abstract description 74
- 238000010795 Steam Flooding Methods 0.000 title claims abstract description 61
- 230000010349 pulsation Effects 0.000 claims abstract description 119
- 230000000694 effects Effects 0.000 claims abstract description 48
- 239000012530 fluid Substances 0.000 claims description 42
- 238000009413 insulation Methods 0.000 claims description 23
- 230000009471 action Effects 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 13
- 238000009792 diffusion process Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000009747 swallowing Effects 0.000 claims description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 62
- 238000010276 construction Methods 0.000 description 22
- 238000002347 injection Methods 0.000 description 20
- 239000007924 injection Substances 0.000 description 20
- 230000000737 periodic effect Effects 0.000 description 14
- 230000020477 pH reduction Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 239000002253 acid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000010356 wave oscillation Effects 0.000 description 1
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- 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
- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- 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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/003—Vibrating earth formations
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- 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
- 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
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Abstract
The invention provides a nonstationary steam injection method used during huff and puff and steam drive, which comprises the steps of completing a well after connecting a steam injection and blockage removal integrated pipe column used by a general steam injection well when the well is the general steam injection well; connecting a well mouth steam injection flow, closing a casing pipe gate, and injecting steam after opening a main gate and an oil pipe gate; the injected steam generates a low-frequency pulsation effect after passing through a steam pulsation generating device for generally injecting steam and enters an oil layer; when the well is a layered steam injection well, the method comprises the steps of completing the well after connecting the steam injection and blockage removal integrated pipe columns used by the layered steam injection well; connecting a well mouth steam injection flow, closing a casing pipe gate, and injecting steam after opening a main gate and an oil pipe gate; the injected steam generates low-frequency pulsation effect after passing through a steam pulsation device for injecting steam in a layered manner and enters an oil layer. The method suitable for the general steam injection well can be applied to steam injection in huff and puff and long-term steam flooding, and is economical and efficient; the method suitable for the layered steam injection well can realize layered pulse steam injection or layered steam flooding and improve the utilization efficiency of steam.
Description
Technical Field
The invention relates to an unsteady-state steam injection method used in huff and puff and steam flooding, belonging to the technical field of heavy oil reservoir development.
Background
Steam huff and puff is the main technical means in the process of thick oil development, and the process of steam huff and puff operation can be divided into three stages, namely steam injection, well stewing and recovery. When the oil reservoir condition is fixed, the steam injection parameters have obvious influence on the development effect. During conventional steam injection throughout development, steam is injected at a constant rate, the effect is better when the number of turns is lower in the initial development stage, but the effect is gradually worsened, the reservoir pressure and the reserve abundance are reduced along with the increase of the number of turns, and the steam also flows along the formed steam flow channel. Because the reservoir has heterogeneity, the distribution volume of the steam is fast expanded in a high-permeability zone, and a medium-permeability zone and a low-permeability zone are relatively slow. After steam injection is finished, the saturation degree of residual oil on the main flow line is lower than that of areas on two sides far away from the main flow line, the residual oil area in the high-permeability zone is smaller, and the dead oil area in the low-permeability zone is the largest. The conventional technical means is to change a steam flow channel to enlarge the swept volume by a profile control measure, but the development benefit of the oil field is reduced under the current low oil price environment.
The prior art related to the pulsation technology which can be searched at present is mostly a physical blockage removal technology, such as hydraulic oscillation, hydraulic fluid pulse, high-pressure water jet, ultrasonic wave and pressure, pulse wave oscillation and the like. For example, chinese patent CN102434121A discloses a downhole low-frequency pumping vibration plugging removal device and a use method thereof, the method realizes oil layer plugging removal in a near-wellbore zone by alternately acting positive pressure formed during squeezing fluid in a wellbore and negative pressure formed during pumping, and the technical purposes are plugging removal without changing a steam injection mode.
China patent CN104033138A discloses a device and a method for integrating steam injection fluctuation and chemical blockage removal of a heavy oil reservoir immovable pipe column. However, the device in the patent only relies on the pulse oscillation deblocking medicament to improve the deblocking effect, and cannot enable steam to generate the pulse effect, and the device is not different from the common steam injection.
Therefore, providing a novel unsteady steam injection method for use in steam flooding and throughout has become an urgent technical problem to be solved in the art.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, the present invention aims to provide a non-steady-state steam injection method for use in steam flooding and steam huffing.
In order to achieve the above object, the present invention provides a non-steady-state steam injection method for use in huff-puff and steam drive, wherein,
when the steam injection well is a general steam injection well, the unsteady steam injection method used during swallowing and spitting and steam driving comprises the following steps:
(1) Connecting the steam injection and blockage removal integrated pipe columns used by the general steam injection well and then completing the well; the steam injection and blockage removal integrated pipe column comprises a heat insulation oil pipe, a heat sensitive packer and a steam pulsation generating device for totally injecting steam; the heat insulation oil pipe is connected with an upper joint of the steam pulsation generating device for totally injecting steam through a heat sensitive packer;
(2) Connecting a well mouth steam injection flow, closing a casing pipe gate, and opening a main gate and an oil pipe gate to inject steam;
(3) Generating a low-frequency pulsation effect after the steam injected in the step (2) passes through the steam pulsation generating device for steam injection in a general manner, and enabling the steam to enter an oil layer;
when the steam injection well is a layered steam injection well, the unsteady steam injection method used during swallowing and spitting and steam flooding comprises the following steps:
1) Connecting the steam injection and blockage removal integrated pipe columns used by the layered steam injection well and then completing the well; the steam injection and blockage removal integrated pipe column comprises a heat insulation oil pipe, a plurality of heat sensitive packers, a plurality of steam pulsation devices for injecting steam in a layered mode and a blocking unit, wherein the heat sensitive packers and the steam pulsation devices for injecting steam in a layered mode are sequentially connected to the heat insulation oil pipe at intervals, and the bottom end of the heat insulation oil pipe is blocked by the blocking unit;
2) Connecting a well mouth steam injection flow, closing a casing pipe gate, and opening a main gate and an oil pipe gate to inject steam;
3) And 2) generating a low-frequency pulsation effect after the steam injected in the step 2) passes through the steam pulsation device for layered steam injection, and entering an oil layer.
According to a specific embodiment of the present invention, in the unsteady steam injection method used in the steam injection and steam flooding, preferably, the steam pulsation generating device for general steam injection comprises an upper joint, an outer sleeve and a lower joint; the centers of the upper joint and the lower joint are both cavities; the upper joint is connected with the upper end internal thread of the outer sleeve through the lower end external thread thereof, and the lower joint is connected with the lower end internal thread of the outer sleeve through the upper end external thread thereof;
a diffusion cavity, a sheath and a bearing sleeve are sequentially arranged in a cavity formed after the lower joint and the upper joint are connected from bottom to top;
the bearing sleeve is provided with a small hole for allowing fluid to pass through;
a rotatable impeller is fixedly arranged in the sheath; the rotating shaft of the impeller is vertical to the central line of the steam pulse generating device for injecting steam in a general way.
In the steam pulsation generating device for the general steam injection, the upper joint, the outer sleeve, the lower joint, the diffusion cavity, the sheath, the bearing sleeve, the impeller and the like can be manufactured by adopting corresponding conventional materials used in the field.
The steam pulsation generating device for the steam injection in the cage and the steam injection and blockage removal integrated pipe column provided by the invention are a device and a pipe column used in the steam injection and acidification construction of a huff-puff well or a steam-driven well in the cage.
According to a particular embodiment of the invention, wherein the direction of fluid inflow (i.e. the position of the upper joint/first upper joint) is defined as "up" and the direction of fluid outflow (i.e. the position of the lower joint/body) is defined as "down".
According to the specific embodiment of the present invention, in the unsteady steam injection method used in the steam injection and steam flooding, preferably, the steam pulsation generating apparatus for general steam injection further comprises a bolt, the bolt passes through a collar of the impeller, and two ends of the bolt are respectively sleeved with a bearing and then fixed to the side wall of the sheath through a nut.
According to the embodiment of the invention, in the unsteady steam injection method used in the steam injection and the steam flooding, preferably, the position of the small hole is deviated from the center line of the steam pulsation generating device for general steam injection.
Wherein the offset of the apertures may achieve a better impact effect.
According to the embodiment of the invention, in the unsteady steam injection method used in the huff and puff and steam flooding, a sealing ring is preferably arranged at the threaded connection between the upper joint and the outer sleeve.
According to the embodiment of the invention, in the unsteady steam injection method used in the huff and puff and steam flooding, a sealing ring is preferably arranged at the threaded connection between the lower joint and the outer sleeve.
According to the embodiment of the invention, in the unsteady steam injection method used in the steam injection and steam flooding, a sealing ring is preferably arranged between the bearing sleeve and the outer sleeve.
According to a specific embodiment of the present invention, in the unsteady steam injection method used in the steam injection and steam flooding, preferably, the central cavity of the lower joint is a funnel-shaped cavity.
According to the specific embodiment of the invention, in the unsteady steam injection method used during both huff and puff and steam drive, the application does not make specific requirements on the specific shape of the impeller and the number of the wheel sheets thereof, and a person skilled in the art can reasonably select the specific shape of the impeller and reasonably set the number of the wheel sheets thereof according to the field operation requirement as long as the purpose of the invention can be realized;
preferably, the number of the impeller is 3.
The working principle of the steam pulsation generating device for the general steam injection provided by the invention is as follows:
when fluid is accelerated through the small holes on the upper joint and the bearing sleeve, the fluid impacts the wheel sheet of the impeller, the impeller rotates under the impact effect, and the fluid is discharged through the diffusion cavity and the lower joint after rotating and accelerating; because the injected medium is continuous, the impeller can rotate continuously, when the impeller rotates, the flow area of the flow channel is changed periodically, a periodic switch cut-off process is formed, and the front pressure and the rear pressure of the rotor are changed periodically, namely periodic pressure pulsation.
The working principle of the steam injection and blockage removal integrated pipe column provided by the invention is as follows:
in daily production, steam enters an oil layer after generating a pulsation effect after passing through a steam pulsation generating device from a heat insulation oil pipe. When the reservoir is blocked in a near-wellbore area, after the pressure test in the flow of a wellhead is qualified, the acidizing construction is started, an acid liquid system is pumped into the heat-insulating oil pipe from a cement truck and is injected into the stratum through a steam pulsation generating device, and the construction pressure is reasonably controlled to ensure the construction safety.
According to the specific embodiment of the invention, in the steam injection and blockage removal integrated tubular column, the heat insulation oil pipe and the heat-sensitive packer are conventional components used in the field.
The steam injection and blockage removal integrated pipe column for the cage steam injection well has the advantages that:
the steam injection and blockage removal integrated tubular column can perform general pulsating steam injection, can meet the requirement of blockage removal measures and realizes the integration of steam injection and blockage removal; the steam pulsation generating device can directly utilize the energy of the pumped medium to generate a pulsation effect without additional energy action; the pulsation makes the injected steam or acid liquor enter the stratum in a wave form, the wave acts on the stratum with strong alternating pressure to generate periodic tension and compression stress in the stratum, and excites the medium in the vibration field, so that certain physical quantity of medium particles is repeatedly changed, solid attachments deposited in oil layer pores are gradually loosened and separated, the steam injection effect can be improved, and the action radius and the action strength of the acidizing fluid can be improved.
When steam is injected in a whole system, the steam pulsation generating device provided by the invention can enable the injected steam to generate a pulsation oscillation effect, so that the injection speed can be increased, and the swept volume can be enlarged; when the injection pressure is too high and the blockage needs to be removed, the steam can be stopped, the steam injection and blockage removal integrated pipe column is utilized to carry out acidification construction, the acidification liquid generates a hydraulic pulsation effect through the pulsation generating device, the chemical corrosion effect in the acidification construction is not only utilized, the physical effect of pulsation is increased, and the blockage removal effect is improved.
The steam pulsation generating device for the general steam injection and the steam injection and blockage removal integrated pipe column provided by the invention have simple structures and are convenient to operate; the device and the integrated tubular column are used for daily pulse steam injection and blockage removal, are used for expanding swept volume through long-term pulse steam injection, can be matched with an acidification measure to remove stratum blockage, and improve the effect of the acidification measure.
The steam pulsation device for layered steam injection and the steam injection and blockage removal integrated pipe column provided by the invention have simple structures and are easy to operate, and are respectively a device for layered pulse steam injection and blockage removal and an integrated pipe column which are suitable for being used in layered steam injection and acidification construction of a steam injection well.
According to the specific embodiment of the invention, technicians in the field can reasonably set the numbers of the thermosensitive packers used in the steam injection and blockage removal integrated tubular column and the steam pulsation devices for layered steam injection according to the field operation requirements, as long as the aims can be realized;
in a specific embodiment of the present invention, preferably, in the steam injection and blockage removal integrated tubular column for the stratified steam injection well, the numbers of the thermal sensitive packer and the steam pulsation device for stratified steam injection are respectively 3.
According to the embodiment of the invention, in the unsteady steam injection method used in the steam injection and steam flooding, the plugging unit is preferably a plug or a ball seat.
According to the specific embodiment of the invention, in the steam injection and blockage removal integrated tubular column, the heat insulation oil pipe, the heat-sensitive packer and the plug are conventional equipment used in the field.
The working principle of the steam injection and blockage removal integrated pipe column provided by the invention is as follows:
in daily production, injected steam enters an oil layer after generating a stable pulse effect after passing through a steam pulsation device for injecting steam in a layered mode through a heat insulation oil pipe; when a reservoir is blocked in a near wellbore area, after the pressure test of a wellhead process is qualified, acidizing construction is started, an acid liquid system is pumped into an oil pipe from a cement truck and is pumped into the stratum through a steam pulsation device for layered steam injection, and the construction pressure is reasonably controlled to ensure the construction safety.
According to the embodiment of the invention, in the unsteady steam injection method used in the steam injection and steam flooding, preferably, the steam pulsation device for stratified steam injection comprises a first upper connector and a main body;
the centers of the first upper joint and the main body are both cavities, the first upper joint is connected with the upper-end internal thread of the main body through the lower-end external thread of the first upper joint, so that a cavity penetrating through the steam pulsation device for layered steam injection is formed after the first upper joint is connected with the main body;
an annular cavity is arranged between the outer side of the cavity of the main body and the inner surface of the side wall of the main body; a plurality of blade wheel frames are arranged in the annular cavity at equal intervals, the top ends of the blade wheel frames are provided with inlets for fluid to flow in at positions close to the outer side of the cavity of the main body, and the bottom ends of the blade wheel frames are provided with outlets for fluid to flow out at positions close to the inner surface of the side wall of the main body; the impeller frames are internally provided with first impellers, the first impellers can rotate under the action of fluid flowing in from the inlet, and the rotating shafts of the first impellers are vertical to the central line of the steam pulsation device for layered steam injection;
outlets of the impeller frames are respectively communicated with corresponding open grooves formed in the main body, so that fluid flows out of the steam pulsation device for layered steam injection;
and a guide body is arranged between the impeller frame and the bottom end of the first upper joint, the guide body is provided with an inlet, and the inlet is communicated with the inlet of the impeller frame so that fluid enters the impeller frame from the inlet of the guide body.
In the steam pulsation device for layered steam injection, the first upper joint, the main body, the impeller frame, the first impeller, the guide body and the like can be manufactured by adopting corresponding conventional materials used in the field.
According to an embodiment of the present invention, in the unsteady steam injection method used in the steam injection and steam flooding, preferably, the guide body is a rectangular parallelepiped having a slope structure facing one side of the cavity, and an inlet of the guide body opens at the slope structure to guide the fluid into the impeller frame through the inlet.
According to the specific embodiment of the invention, in the unsteady steam injection method used during the huff and puff and the steam drive, a person skilled in the art can reasonably set the number of the used blade wheel frames according to the field operation requirement as long as the aim of the invention can be realized;
in one embodiment of the present invention, preferably, the number of the impeller frames is 4 or 6.
According to an embodiment of the present invention, in the unsteady steam injection method used in the steam injection and steam flooding, preferably, the guide body and the impeller frame are respectively compressed by a pressing cap.
According to a specific embodiment of the present invention, in the unsteady steam injection method for use in the huff and puff and steam flooding, preferably, the first impeller is fixedly installed in the impeller frame through a cap.
According to the embodiment of the invention, in the steam pulsation device for layered steam injection, the pressure cap and the protective cap are conventional parts used in the field.
The working principle of the steam pulsation device for layered steam injection provided by the invention is as follows:
when the steam pulsation device for layered steam injection is used in a steam injection and blockage removal integrated pipe column, the bottom end of a used heat insulation oil pipe is connected with a ball seat or a screwed plug, after the steam pulsation device is put into a well, when a part of injection media (fluid) flows through a guide body, the flow velocity is increased through an inlet on the guide body, an impact force is generated to impact blades on a first impeller, the flow velocity is reduced, the first impeller rotates, the injection media are discharged from an outlet groove arranged on a main body after being accelerated by rotation, the first impeller can continuously rotate, when the first impeller rotates, the flow passage flow area is periodically changed, a periodic switch shutoff process is formed, the pressure before and after a rotor generates periodic change, namely periodic pressure pulse, and the periodic pressure pulse is transmitted into a shaft through the outlet groove on the main body and acts on a reservoir stratum;
the other part of the injection medium enters the next-stage tool from a cavity penetrating through the steam pulsation device for layered steam injection, and the bottom end of the heat insulation oil pipe is sealed by a plug or a ball seat, so that the injection medium can only flow out along a pulse generation channel (namely an outlet groove) when flowing to the lowermost tool.
When the layered steam injection well injects steam, the steam pulsation device provided by the invention can enable injected fluid to generate a pulse oscillation effect, and the steam pulsation device can be used for improving the injection speed and enlarging the swept volume; when the injection pressure is too high and the steam injection well needs to be unblocked, steam is shut down, the steam injection and unblocking integrated pipe column provided by the invention is utilized for acidizing construction, the acidizing fluid generates a hydraulic pulse effect through the steam injection and unblocking integrated pipe column arranged on the pipe column, the chemical corrosion action in the acidizing construction is not utilized, the physical action of the pulse is increased, and the unblocking effect is improved.
The steam pulsation device for layered steam injection and the steam injection and blockage removal integrated pipe column provided by the invention can not only perform conventional layered pulsation steam injection, but also meet the requirement of blockage removal measures, and can realize layered steam injection and blockage removal integration; the steam pulsation device can utilize the energy of a pumping medium (injection fluid) to generate a pulse effect without additional energy action; the pulse action makes the injected steam or acid liquor system enter the stratum in a wave form, the wave acts on the stratum with strong alternating pressure, and generates periodic tension and compression stress in the stratum to excite the medium in the vibration field, so that certain physical quantity of medium particles is repeatedly changed, solid attachments deposited in oil layer pores are gradually loosened and separated, the steam injection effect can be improved, and the action radius and the action strength of the acidizing fluid can be improved.
According to the embodiment of the invention, in the unsteady steam injection method used in the steam injection and steam flooding, the frequency of the low-frequency pulsation in the step (3) is preferably 8-20Hz.
According to the embodiment of the invention, in the unsteady steam injection method used in the steam injection and steam flooding, the frequency of the low-frequency pulsation in the step 3) is preferably 8-20Hz.
In the unsteady steam injection method used during steam injection and steam flooding provided by the invention, a steam pulsation generating device (a steam pulsation device for general steam injection or a steam pulsation device for layered steam injection) is connected on a steam injection pipe column, pressure gradient change in an oil reservoir is caused by a pulsation effect, the larger the pressure gradient is, the larger the planar swept volume is, and the more obvious the effect of improving the recovery ratio of steam flooding is.
The unsteady steam injection method used in huff and puff and steam drive provided by the invention is suitable for high-efficiency development of the heavy oil reservoir, is an economic, practical and reliable method, can enable injected steam to generate a pulsation effect, can be used for daily huff and puff steam injection or steam drive, and improves the steam injection development effect. The unsteady steam injection method used in huff and puff and steam drive provided by the invention has the following advantages:
1. other downhole tools are not needed, special equipment is not needed to be used for a long time, and universality is high;
2. no extra equipment is needed on site during steam injection, and an original steam injection pipe network or a movable steam generating device is adopted;
3. the pulse steam injection implementation process is simple, the limitation is smaller, the pulse steam injection effect can be generated in the underground for a long time when the injection amount is fixed, the improvement of the steam injection speed is facilitated, and the swept volume is enlarged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a steam pulse generation device for general steam injection provided in embodiment 1 of the present invention;
fig. 2 is a schematic view of the connection relationship of impellers in the steam pulse generating device for general steam injection provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a steam injection and blockage removal integrated pipe column for a general steam injection well according to embodiment 2 of the present invention;
FIG. 4 is a schematic structural diagram of a steam pulsation apparatus for injecting steam in layers provided in embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a steam injection and blockage removal integrated pipe column for a layered steam injection well according to embodiment 4 of the present invention.
The main reference numbers indicate:
1. an upper joint;
2. a jacket;
3. a bearing housing;
4. a bolt;
5. a bearing;
6. a sheath;
7. an impeller;
8. a diffusion chamber;
9. a lower joint;
10. a first nut;
11. a second nut;
12. a first heat insulation oil pipe;
13. a first heat sensitive packer;
14. a steam pulsation generating device for injecting steam in a general manner;
15. an oil layer;
16. a first tubing gate;
17. a first main gate;
18. a first casing gate;
19. a first upper joint;
20. a guide body;
21. an impeller frame;
22. a first impeller;
23. a main body;
24. a second tubing gate;
25. a second main gate;
26. a second casing gate;
27. a second heat insulation oil pipe;
28. a second heat sensitive packer;
29. a third heat sensitive packer;
30. a fourth thermal sensitive packer;
31. the first steam pulsation device is used for injecting steam in layers;
32. a second steam pulsation device for injecting steam in layers;
33. a third steam pulsation device for injecting steam in layers;
34. a first oil layer;
35. a second oil layer;
36. a third oil layer;
37. and (7) plugging the unit.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the following specific examples in order to clearly understand the technical features, objects and advantages of the present invention, but the present invention should not be construed as being limited to the implementable scope of the present invention.
Example 1
The embodiment provides a steam pulse generating device for general steam injection, wherein a schematic structural diagram of the steam pulse generating device for general steam injection is shown in fig. 1, and as can be seen from fig. 1, the steam pulse generating device for general steam injection comprises an upper connector 1, an outer sleeve 2 and a lower connector 9; the centers of the upper joint 1 and the lower joint 9 are both hollow cavities; the upper joint 1 is connected with the upper end internal thread of the outer sleeve 2 through the lower end external thread thereof, and the lower joint 9 is connected with the lower end internal thread of the outer sleeve 2 through the upper end external thread thereof;
a diffusion cavity 8, a sheath 6 and a bearing sleeve 3 are sequentially arranged in a cavity formed after the lower joint 9 and the upper joint 1 are connected from bottom to top;
the bearing sleeve 3 is provided with a small hole, and the position of the small hole deviates from the central line of the steam pulsation generating device for totally injecting steam and is used for enabling fluid to pass through;
the device also comprises a bolt 4, wherein the bolt 4 penetrates through a shaft collar of the impeller 7, and two ends of the bolt 4 are respectively sleeved with the bearings 5 and then fixed on the side wall of the sheath 6 through a first nut 10 and a second nut 11; so that the rotation axis of the impeller 7 is perpendicular to the center line of the steam pulsation generating apparatus for general steam injection, wherein a schematic view of the connection relationship of the impeller 7 is shown in fig. 2.
In this embodiment, a sealing ring is disposed at a threaded connection between the upper joint 1 and the outer sleeve 2, a sealing ring is disposed at a threaded connection between the lower joint 9 and the outer sleeve 2, and a sealing ring is also disposed between the bearing sleeve 3 and the outer sleeve 2.
In this embodiment, the central cavity of the lower joint 9 is a funnel-shaped cavity, as shown in fig. 1.
In this embodiment, the number of the impellers 7 is 3.
The working principle of the steam pulsation generating device for general steam injection provided by the embodiment 1 of the invention is as follows:
when fluid is accelerated through the small holes on the upper joint and the bearing sleeve, the fluid impacts the wheel sheet of the impeller, the impeller rotates under the impact effect, and the fluid is discharged through the diffusion cavity and the lower joint after rotating and accelerating; because the injected medium is continuous, the impeller can rotate continuously, when the impeller rotates, the flow area of the flow channel is changed periodically, a periodic switch cut-off process is formed, and the front pressure and the rear pressure of the rotor are changed periodically, namely periodic pressure pulsation.
Example 2
The embodiment provides a steam injection and blockage relieving integrated pipe column, wherein a schematic structural diagram of the steam injection and blockage relieving integrated pipe column is shown in fig. 3, and as can be seen from fig. 3, the steam injection and blockage relieving integrated pipe column comprises a first heat insulation oil pipe 12, a first heat-sensitive packer 13 and a steam pulsation generating device 14 for general steam injection, which is provided in embodiment 1; the first insulated tubing 12 is connected via a first heat sensitive packer 13 to the upper connection of the steam pulse generator 14 for general steam injection.
The working principle of the steam injection and blockage removal integrated pipe column provided by the embodiment 2 of the invention is as follows:
in daily production, steam enters an oil layer after generating a pulsation effect after passing through a steam pulsation generating device from a heat insulation oil pipe. When the reservoir is blocked in a near wellbore area, after the pressure test of a wellhead process is qualified, acidizing construction is started, an acid liquid system is pumped into the heat insulation oil pipe from a cement truck and is pumped into the stratum through a steam pulsation generating device, and construction pressure is reasonably controlled to ensure construction safety.
The steam injection and blockage removal integrated tubular column can perform general pulsating steam injection, can meet the requirement of blockage removal measures and realizes the integration of steam injection and blockage removal; the steam pulsation generating device can directly utilize the energy of the pump injection medium to generate a pulsation effect without additional energy action; the pulsation makes the injected steam or acid liquor enter the stratum in a wave form, the wave acts on the stratum with strong alternating pressure to generate periodic tension and compression stress in the stratum, and excites the medium in the vibration field, so that certain physical quantity of medium particles is repeatedly changed, solid attachments deposited in oil layer pores are gradually loosened and separated, the steam injection effect can be improved, and the action radius and the action strength of the acidizing fluid can be improved.
When steam is injected in a whole system, the steam pulsation generating device provided by the invention can enable the injected steam to generate a pulsation oscillation effect, so that the injection speed can be increased, and the swept volume can be enlarged; when the injection pressure is too high and the blockage needs to be removed, the steam can be stopped, the steam injection and blockage removal integrated pipe column is utilized to carry out acidification construction, the acidification liquid generates a hydraulic pulsation effect through the pulsation generating device, the chemical corrosion effect in the acidification construction is not only utilized, the physical effect of pulsation is increased, and the blockage removal effect is improved.
Example 3
The present embodiment provides a steam pulsation device for injecting steam in layers, wherein the structure of the steam pulsation device for injecting steam in layers is schematically shown in fig. 4, and it can be seen from fig. 4 that the device comprises a first upper joint 19 and a main body 23;
the centers of the first upper joint 19 and the main body 23 are both hollow cavities, the first upper joint 19 is connected with the upper-end internal thread of the main body 23 through the lower-end external thread of the first upper joint, so that a cavity penetrating through the steam pulsation device for layered steam injection is formed after the first upper joint 19 is connected with the main body 23;
an annular cavity is arranged between the outer side of the cavity of the main body 23 and the inner surface of the side wall of the main body 23; six impeller frames 21 are arranged in the annular cavity at equal intervals, the top end of each impeller frame 21, which is close to the outer side of the cavity of the main body 23, is provided with an inlet for fluid to flow in, and the bottom end of each impeller frame 21, which is close to the inner surface of the side wall of the main body 23, is provided with an outlet for fluid to flow out; the six impeller frames 21 are internally provided with first impellers 22, the first impellers 22 can rotate under the action of fluid flowing from the inlet, and the rotating shafts of the first impellers 22 are vertical to the central line of the steam pulsation device for layered steam injection;
outlets of the six impeller frames 21 are respectively communicated with corresponding open grooves formed in the main body 23, so that fluid flows out of the steam pulsation device for layered steam injection;
a guide body 20 is arranged between the impeller frame 21 and the bottom end of the first upper joint 19, the guide body 20 is a cuboid with a slope structure, the slope structure faces one side of the cavity, an inlet of the guide body 20 is arranged at the slope structure, and the inlet is communicated with an inlet of the impeller frame 21 so as to guide fluid to enter the impeller frame 21 through the inlet;
in this embodiment, the guide body 20 and the vane carrier 21 are respectively pressed by pressing caps;
in this embodiment, the first impeller 22 is fixedly mounted in the impeller frame 21 through a cap.
The working principle of the steam pulsation device for layered steam injection provided by the embodiment 3 is as follows:
when the steam pulsation device for layered steam injection is used in a steam injection and blockage removal integrated pipe column, the bottom end of a second heat insulation oil pipe is connected with a ball seat or a screwed plug, after the steam pulsation device is put into a well, when a part of injection media (fluid) flows through a guide body, the flow velocity is increased through an inlet on the guide body, an impact force is generated to impact blades on a first impeller, the first impeller is rotated (the flow velocity is reduced), the injection media are discharged from an outlet groove arranged on a main body after being accelerated in rotation, the first impeller can rotate continuously, when the first impeller rotates, the flow passage flow area is changed periodically, a periodic switch shutoff process is formed, and the pressure changes periodically before and after a rotor, namely periodic pressure pulses are transmitted into a shaft through the outlet groove on the main body and act on a corresponding oil layer.
Example 4
The present embodiment provides a steam injection and blockage relieving integrated pipe column, wherein a schematic structural diagram of the steam injection and blockage relieving integrated pipe column is shown in fig. 5, and as can be seen from fig. 5, the pipe column includes a second insulated oil pipe 27, three thermal packers, namely a second thermal packer 28, a third thermal packer 29 and a fourth thermal packer 30, three steam pulsing devices for layered steam injection provided in embodiment 3, namely a first steam pulsing device 31 for layered steam injection, a second steam pulsing device 32 for layered steam injection, a third steam pulsing device 33 for layered steam injection, and a blocking unit 37;
the second heat-sensitive packer 28, the first steam pulsation device 31 for layered steam injection, the third heat-sensitive packer 29, the second steam pulsation device 32 for layered steam injection, the fourth heat-sensitive packer 30 and the third steam pulsation device 33 for layered steam injection are sequentially connected to the second heat-insulating oil pipe 27 at intervals, and the bottom end of the second heat-insulating oil pipe 27 is sealed by a sealing unit 37.
In this embodiment, the plugging unit 37 is a plug or a ball seat.
The working principle of the steam injection and blockage removal integrated pipe column provided by the embodiment 4 is as follows:
in daily production, injected steam enters an oil layer after generating a stable pulse effect after passing through a steam pulsation device for injecting steam in a layered mode through a second heat insulation oil pipe; when a reservoir is blocked in a near wellbore area, after the pressure test of a wellhead process is qualified, acidizing construction is started, an acid liquid system is pumped into an oil pipe from a cement truck and is pumped into the stratum through a steam pulsation device for layered steam injection, and the construction pressure is reasonably controlled to ensure the construction safety.
When the layered steam injection well injects steam, the steam pulsation device provided by the invention can enable injected fluid to generate a pulse oscillation effect, and the steam pulsation device can be used for improving the injection speed and enlarging the swept volume; when the injection pressure is too high and the blockage of the steam injection well needs to be removed, the steam is shut down, the steam injection and blockage removal integrated pipe column provided by the invention is utilized for acidizing construction, the steam injection and blockage removal integrated pipe column arranged on the pipe column enables acidizing fluid to generate a hydraulic pulse effect, the chemical corrosion action in the acidizing construction is not utilized, the physical action of the pulse is increased, and the blockage removal effect is improved.
The steam pulsation device for layered steam injection and the steam injection and blockage removal integrated pipe column provided by the invention can perform conventional layered pulsation steam injection, can meet the requirements of blockage removal measures, and can realize layered steam injection and blockage removal integration; the steam pulsation device can utilize the energy of a pumping medium (injection fluid) to generate a pulse effect without additional energy action; the pulse action makes the injected steam or acid liquor system enter the stratum in a wave form, the wave acts on the stratum with strong alternating pressure, and generates periodic tension and compression stress in the stratum to excite the medium in the vibration field, so that certain physical quantity of medium particles is repeatedly changed, solid attachments deposited in oil layer pores are gradually loosened and separated, the steam injection effect can be improved, and the action radius and the action strength of the acidizing fluid can be improved.
Example 5
The embodiment provides an unsteady steam injection method suitable for throughput and steam flooding of a general steam injection well, wherein the unsteady steam injection method used during throughput and steam flooding comprises the following steps:
in the embodiment, the general steam injection well is a thickened oil huff-puff well with a casing pipe inner diameter of 177.8 mm and a well depth of 1930 m, the thickness of an oil layer 15 is 50 m, and the position of the oil layer is 1800.0-1850.0 m;
and (3) during normal steam injection:
(1) Connecting the steam injection and blockage removal integrated pipe columns used by the general steam injection well provided by the embodiment 2 and then completing the well;
(2) Connecting a well mouth steam injection flow, closing a first sleeve gate 18, and opening a first main gate 17 and a first oil pipe gate 16 to inject steam;
(3) Generating a low-frequency pulsation effect after the steam injected in the step (2) passes through the steam pulsation generating device for steam injection in a general manner, and enabling the steam to enter an oil layer;
and (4) the frequency of the low-frequency pulse in the step (3) is 8-20Hz.
The unsteady steam injection method suitable for throughout and steam flooding of the general steam injection well provided by the embodiment can be applied to throughout steam injection and long-term steam flooding, and is economical and efficient.
In this example 5, the steam injection amount is 4310t, the rate is 8t/h, the daily oil yield is increased from 3.4t/d to 5.1t/d compared with the production data without pulse steam injection in the previous period after pulse steam injection.
Example 6
The embodiment provides an unsteady steam injection method suitable for huff and puff and steam flooding of a layered steam injection well, wherein the unsteady steam injection method used during the huff and puff and the steam flooding comprises the following steps:
in the embodiment, the layered steam injection well is an oil well with a sleeve pipe inner diameter of 177.8 mm and a well depth of 1780 m, 13 layers of the first oil layer 34 and the second oil layer 35 with the thickness of 29 m are arranged, and the positions of the layers are 1660.4-1731.9 m; the thickness of the third oil layer 36 is 3 layers in total, 7 meters, and the position is 1739-1746 meters;
and (3) during normal steam injection:
1) Connecting the steam injection and blockage removal integrated pipe columns used in the layered steam injection well provided by the embodiment 4, and then completing the well;
2) Connecting a well mouth steam injection flow, closing the second sleeve gate 26, and opening the second main gate 25 and the second oil pipe gate 24 to inject steam;
3) The steam injected in the step 2) generates a low-frequency pulsation effect after passing through the steam pulsation device for layered steam injection and enters an oil layer;
the frequency of the low-frequency pulsation in the step 3) is 8-20Hz.
The unsteady steam injection method applicable to the huff and puff of the layered steam injection well and used in the steam flooding provided by the embodiment can realize layered pulse steam injection or layered steam flooding and improve the steam utilization efficiency.
In example 6, the gas injection amount was 3000t, the rate was 18t/d, and the daily oil production was increased from 2.3t/d to 5.7t/d compared with the production without pulse injection in the previous cycle.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (21)
1. An unsteady steam injection method used in huff and puff and steam drive is characterized in that,
when the steam injection well is a general steam injection well, the unsteady-state steam injection method used during swallowing and spitting and steam driving comprises the following steps:
(1) Connecting the steam injection and blockage removal integrated pipe columns used by the general steam injection well and then completing the well; the steam injection and blockage removal integrated pipe column comprises a heat insulation oil pipe, a heat sensitive packer and a steam pulsation generating device for totally injecting steam; the heat insulation oil pipe is connected with an upper joint of the steam pulse generating device for general steam injection through a heat-sensitive packer;
the steam pulsation generating device for the general steam injection comprises an upper connector (1), an outer sleeve (2) and a lower connector (9); the centers of the upper joint (1) and the lower joint (9) are both hollow cavities; the upper joint (1) is connected with the upper end internal thread of the outer sleeve (2) through the lower end external thread thereof, and the lower joint (9) is connected with the lower end internal thread of the outer sleeve (2) through the upper end external thread thereof;
a diffusion cavity (8), a sheath (6) and a bearing sleeve (3) are sequentially arranged from bottom to top in a cavity formed after the lower joint (9) and the upper joint (1) are connected;
the bearing sleeve (3) is provided with a small hole for allowing fluid to pass through;
a rotatable impeller (7) is fixedly arranged in the sheath (6); the rotating shaft of the impeller (7) is vertical to the central line of the steam pulsation generating device for injecting steam in a general way;
(2) Connecting a well mouth steam injection flow, closing a casing pipe gate, and opening a main gate and an oil pipe gate to inject steam;
(3) Generating a low-frequency pulsation effect after the steam injected in the step (2) passes through the steam pulsation generating device for injecting steam in a general way, and enabling the steam to enter an oil layer; wherein, the frequency of the low-frequency pulse in the step (3) is 8-20Hz;
when the steam injection well is a layered steam injection well, the unsteady steam injection method used during swallowing and spitting and steam flooding comprises the following steps:
1) Connecting the steam injection and blockage removal integrated pipe columns used by the layered steam injection well and then completing the well; the steam injection and blockage removal integrated pipe column comprises a heat insulation oil pipe, a plurality of heat sensitive packers, a plurality of steam pulsation devices for injecting steam in a layered mode and a blocking unit, wherein the heat sensitive packers and the steam pulsation devices for injecting steam in a layered mode are sequentially connected to the heat insulation oil pipe at intervals, and the bottom end of the heat insulation oil pipe is blocked by the blocking unit;
wherein the steam pulsation device for layered steam injection comprises a first upper joint (19) and a main body (23);
the centers of the first upper joint (19) and the main body (23) are both cavities, the first upper joint (19) is connected with the upper-end internal thread of the main body (23) through the lower-end external thread of the first upper joint, so that a cavity penetrating through the steam pulsation device for layered steam injection is formed after the first upper joint (19) is connected with the main body (23);
an annular cavity is arranged between the outer side of the cavity of the main body (23) and the inner surface of the side wall of the main body (23); a plurality of impeller frames (21) are arranged in the annular cavity at equal intervals, inlets for fluid to flow in are formed in the positions, close to the outer side of the cavity of the main body (23), of the top ends of the impeller frames (21), and outlets for fluid to flow out are formed in the positions, close to the inner surface of the side wall of the main body (23), of the bottom ends of the impeller frames (21); a plurality of impeller frames (21) are internally provided with first impellers (22), under the action of fluid flowing in from the inlet, the first impellers (22) can rotate, and the rotating shafts of the first impellers are vertical to the central line of the steam pulsation device for layered steam injection;
outlets of the impeller frames (21) are respectively communicated with corresponding open grooves formed in the main body (23) so that fluid flows out of the steam pulsation device for layered steam injection;
a guide body (20) is arranged between the impeller frame (21) and the bottom end of the first upper joint (19), the guide body (20) is provided with an inlet, and the inlet is communicated with the inlet of the impeller frame (21) so that fluid enters the impeller frame (21) from the inlet of the guide body (20);
2) Connecting a well mouth steam injection flow, closing a casing pipe gate, and opening a main gate and an oil pipe gate to inject steam;
3) The steam injected in the step 2) generates a low-frequency pulsation effect after passing through the steam pulsation device for injecting steam in a layered manner, and enters an oil layer; wherein the frequency of the low-frequency pulsation in the step 3) is 8-20Hz.
2. The unsteady steam injection method for huff and puff and steam flooding according to claim 1, wherein the steam pulsation generator for general steam injection further comprises a bolt (4), wherein the bolt (4) passes through a shaft collar of the impeller (7), and two ends of the bolt (4) are respectively sleeved with a bearing and then fixed on the side wall of the sheath (6) through nuts.
3. A non-steady state steam injection method for use in throughputs and steam flooding as claimed in claim 1 or claim 2 wherein said apertures are located off-center from the centre line of the steam pulse generating means for general steam injection.
4. The unsteady steam injection method for use in huff and puff and steam flooding as claimed in claim 1 or 2, wherein the threaded connection between the upper fitting (1) and the outer casing (2) is provided with a sealing ring.
5. The unsteady steam injection method for use in huff and puff and steam flooding as claimed in claim 3, wherein the threaded connection between the upper fitting (1) and the outer casing (2) is provided with a sealing ring.
6. Unsteady steam injection method in huff and puff and steam flooding according to claim 1 or 2 characterized in that the threaded connection between the lower sub (9) and the outer casing (2) is provided with a sealing ring.
7. The unsteady steam injection method for huff and puff and steam flooding according to claim 3 wherein the threaded connection between the lower fitting (9) and the outer casing (2) is provided with a sealing ring.
8. Unsteady state steam injection method in huff and puff and steam flooding as claimed in claim 1 or 2, characterized in that between the bearing housing (3) and the outer housing (2) there is provided a sealing ring.
9. The unsteady steam injection method for huff and puff and steam flooding according to claim 3 wherein a sealing ring is arranged between the bearing sleeve (3) and the outer sleeve (2).
10. The unsteady steam injection method for huff and puff and steam flooding according to claim 1 or 2 characterized in that the central cavity of the lower joint (9) is funnel shaped.
11. The unsteady steam injection method for use in huff and puff and steam flooding as claimed in claim 3, wherein the central cavity of the lower joint (9) is a funnel shaped cavity.
12. The unsteady steam injection method for use in through-put and steam flooding according to claim 1 or 2, characterized in that the number of blades of the impeller (7) is 3.
13. The unsteady steam injection method for use in through-put and steam flooding according to claim 3, characterized in that the number of blades of said impeller (7) is 3.
14. The unsteady steam injection method for huff and puff and steam flooding according to claim 1, wherein the number of the thermal packers and the number of the steam pulsation devices for injecting steam in layers are respectively 3 in the steam injection and blockage removal integrated pipe column for the steam injection wells in layers.
15. The unsteady steam injection method for huff and puff and steam flooding as claimed in claim 1 wherein the plugging unit is a plug or a ball seat.
16. The unsteady steam injection method for huff and puff and steam flooding as claimed in claim 1, characterized in that the guiding body (20) is a cuboid with a ramp structure facing the cavity side and that the inlet of the guiding body (20) opens at the ramp structure to guide the fluid into the impeller frame (21) via the inlet.
17. The unsteady steam injection method for huff and puff and steam flooding according to claim 1 or 16, characterized in that the number of impeller frames (21) is 4 or 6.
18. The unsteady steam injection method for use in huff and puff and steam flooding as claimed in claim 1 or 16, wherein said guide body (20) and said impeller frame (21) are compressed by a compression cap, respectively.
19. The unsteady steam injection method for huff and puff and steam flooding as claimed in claim 17 wherein the guide body (20) and the impeller frame (21) are compressed by a pressure cap, respectively.
20. The unsteady steam injection method for use in huff and puff and steam flooding as claimed in claim 1 or 16, wherein said first impeller (22) is fixedly mounted in an impeller frame (21) by means of a cap.
21. The unsteady steam injection method for use in huff and puff and steam flooding as claimed in claim 17, wherein said first impeller (22) is fixedly mounted in an impeller frame (21) by means of a cap.
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| CN2734996Y (en) * | 2004-06-17 | 2005-10-19 | 大连大学 | High pressure steam iso-dryness distributor |
| US8113278B2 (en) * | 2008-02-11 | 2012-02-14 | Hydroacoustics Inc. | System and method for enhanced oil recovery using an in-situ seismic energy generator |
| CN101676516A (en) * | 2008-09-18 | 2010-03-24 | 长江大学 | High-gas-contained well multiphase mixed transportation processing equipment |
| CN203035141U (en) * | 2013-01-29 | 2013-07-03 | 中国石油集团渤海钻探工程有限公司 | Downhole impeller-type impulsator |
| CN105464638A (en) * | 2015-10-29 | 2016-04-06 | 中国石油大学(北京) | Coal bed gas well pulse radial drilling and double-pulsating hydrofracturing method |
| CN107989584B (en) * | 2016-10-26 | 2023-06-16 | 中国石油化工股份有限公司 | Injection and production integrated device and method for horizontal well |
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