CN110952965A - Underground separate-layer water injection process system and method - Google Patents
Underground separate-layer water injection process system and method Download PDFInfo
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- CN110952965A CN110952965A CN202010001234.3A CN202010001234A CN110952965A CN 110952965 A CN110952965 A CN 110952965A CN 202010001234 A CN202010001234 A CN 202010001234A CN 110952965 A CN110952965 A CN 110952965A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 192
- 238000002347 injection Methods 0.000 title claims abstract description 93
- 239000007924 injection Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 58
- 239000010410 layer Substances 0.000 claims abstract description 43
- 239000011229 interlayer Substances 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 28
- 238000005259 measurement Methods 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 17
- 210000000078 claw Anatomy 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 241000251468 Actinopterygii Species 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 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
- E21B43/20—Displacing by water
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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
- E21B43/14—Obtaining from a multiple-zone well
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Abstract
The invention provides a downhole separate-layer water injection process system and a method, which comprises a downhole intelligent separate-layer water injection pipe column and a downhole fishing device, wherein the downhole intelligent separate-layer water injection pipe column comprises a casing protection packer, an intelligent water distributor, a preset working barrel, a double-acting valve, a sieve pipe and a plug which are sequentially connected from top to bottom, one or more intelligent water distributors are provided, and an interlayer packer is arranged between every two adjacent intelligent water distributors; the intelligent water distributor comprises a water nozzle assembly and a battery assembly, and the underground throwing and fishing device is used for fishing and throwing the battery assembly. When the electric quantity of the battery assembly is exhausted, the underground throwing and fishing device is put into the well to fish the battery assembly out of the ground, and the new battery assembly with sufficient electric quantity is replaced, so that the underground service time of the water distributor can be effectively prolonged. The underground layered flow is automatically measured and adjusted, so that the layered water injection rate can meet the layered injection allocation requirement for a long time, and the qualified rate of the layered injection allocation is greatly improved; the intelligent water distributor can monitor production dynamic data such as underground layered flow, oil pipe pressure, formation pressure and the like for a long time.
Description
Technical Field
The invention belongs to the technical field of intelligent water injection in oil fields, and particularly relates to a downhole separate layer water injection process system and method.
Background
The conventional mechanical principle is mainly adopted in the existing separate injection process, the underground layered flow can be tested and adjusted only through manual operation, a large amount of manpower and material resources are required to be matched on site, annual matching test cost is high, workload is high, requirements on a shaft environment are high, and the risk of blocking during test allocation is high. Meanwhile, the method is influenced by cost factors, the annual measurement and frequency modulation frequency of the separate injection well is low, the layered flow is influenced by factors such as pressure fluctuation of a ground system, stratum water absorption capacity and the like, the separate injection qualification rate is reduced quickly, and the development effect of layered water injection is limited. Finally, the conventional process can only adopt fixed-period manual testing of dynamic data, and cannot continuously monitor layered dynamic information, so that the dynamic adjustment difficulty of the oil reservoir water injection development policy is high.
Along with the development of the oil field, the separate injection well increases year by year, the measuring and adjusting workload is large, and the matching measuring and adjusting cost increases year by year; the frequent occurrence of the resistance during the measurement and the adjustment leads to high cost of post-stage string detection and under-pressure operation; the check-fit lattice rate is reduced quickly under the influence of factors such as pressure fluctuation, stratum water absorption capacity change and the like, and the requirement of fine zonal injection of the oil field is difficult to meet; meanwhile, in order to further improve the water injection digitization level, digital separate injection process research and tests are carried out, and a series of digital water distributors and various underground wireless communication modes are developed, but underground intelligent water distributors are powered by underground disposable lithium batteries, so that the electric quantity is limited, and the service time of the underground intelligent water distributors is limited.
Disclosure of Invention
The invention aims to provide a downhole separate layer water injection process system, which overcomes the technical problems in the prior art.
The invention also aims to provide a downhole separate layer water injection process method, which ensures that the separate layer water injection quantity meets the separate layer injection allocation requirement for a long time and greatly improves the pass rate of the separate layer injection allocation.
Therefore, the technical scheme provided by the invention is as follows:
the underground separate-zone water injection process system comprises an underground intelligent separate-zone water injection pipe column and an underground throwing and fishing device, wherein the underground intelligent separate-zone water injection pipe column comprises one or more casing pipe protection packers, intelligent water distributors, a preset working barrel, a double-acting valve, a sieve pipe and a plug which are sequentially connected from top to bottom, and an interlayer packer is arranged between every two adjacent intelligent water distributors;
the intelligent water distributor comprises a water nozzle assembly and a battery assembly, and the underground throwing and fishing device is used for fishing and throwing the battery assembly.
The intelligent water distributor comprises an upper joint, an outer protecting pipe and a lower joint which are sequentially connected from top to bottom, wherein an overflowing channel is arranged in the outer protecting pipe, and a motor control unit, a flow measuring unit, a data processing unit, a water nozzle assembly and a battery assembly are arranged in an eccentric hole between the outer protecting pipe and the overflowing channel;
the flow measurement unit, the motor control unit and the battery assembly are electrically connected with the data processing unit, the motor control unit and the battery assembly are electrically connected with the water nozzle assembly, the data processing unit is used for receiving a flow signal of the flow measurement unit and comparing the flow signal with a preset injection allocation amount, when the phase difference is out of an error range, a signal is sent to the motor control unit and the battery assembly, and the motor control unit is used for adjusting the water nozzle assembly according to the signal of the data processing unit.
The underground fishing device comprises a shell, wherein a first locking structure, a fishing arm, a cavity, a second locking structure and a guide arm are arranged on the shell from top to bottom, the first locking structure is connected with the fishing arm, the first spring is arranged between the first locking structure and the fishing arm, the second locking structure is connected with the guide arm, and the second spring is arranged between the second locking structure and the guide arm.
The battery assembly comprises a fishing rod, a limiting block and a battery bin which are sequentially connected from top to bottom, and an induction coil is arranged on the lower portion of the battery bin.
The flow measuring unit is a pore plate differential pressure flowmeter.
And a seal checking and measuring unit is also arranged in an annular space between the outer protecting pipe and the overflowing channel.
A process method for underground layered water injection includes such steps as using underground layered water injection system to make the injected water flow in from top joint and the water flow in from bottom joint to bottom joint, making the water flow in flow measuring unit from water inlet and then out from water outlet to stratum, calculating the flow rate of the injected water by flow measuring unit, comparing it with preset injection amount, and sending signals to motor control unit and battery assembly when the difference between them is out of error range.
Before the intelligent water distributor goes into the well, water injection parameters and a working system are set.
The working system comprises the time for automatically opening the water nozzle, the error range of automatic measurement and adjustment, the period of automatic measurement and adjustment and the period parameter of automatic seal inspection.
When the electric quantity of the intelligent water distributor is reduced to be incapable of working, a cable of a cable well testing vehicle is connected with the underground throwing and fishing device, when fishing, the underground throwing and fishing device is lifted when the intelligent water distributor passes through a target layer, the first locking structure and the second locking structure are blocked and opened, and the fishing arm and the guide arm are respectively opened under the action of the first spring and the second spring; after the throwing and fishing claw at the lower end of the fishing arm is connected with the battery assembly, the underground throwing and fishing device is lifted upwards, the battery assembly is taken out of an eccentric hole of the intelligent water distributor, the battery assembly is withdrawn into a cavity of the underground throwing and fishing device after being lifted out, and the test car lifts the cable to lift the battery assembly to the ground;
when the cable well testing vehicle is thrown, the cable well testing vehicle is connected with an underground throwing and fishing device and is put into an oil pipe of a water injection well, when an intelligent water distributor of a layer passes through the well, the underground throwing and fishing device is lifted, the first locking structure and the second locking structure are blocked and opened, and the fishing arm and the guide arm are respectively opened under the action of the first spring and the second spring; and (3) downwards sending the battery assembly to the proper position, upwards lifting the underground throwing and fishing device after the throwing and fishing claw is separated from the battery assembly, and sending the battery assembly into an eccentric hole of the water distributor.
The invention has the beneficial effects that:
1) when the electric quantity of the battery assembly is exhausted, the battery assembly in the intelligent water distributor can be fished out of the ground by the underground throwing and fishing device, then the battery assembly with sufficient electric quantity is replaced, and the battery assembly is thrown and sent down and installed in the intelligent water distributor, so that the underground service time of the water distributor can be effectively prolonged.
2) The underground layered flow is automatically measured and adjusted, so that the layered water injection rate can meet the layered injection allocation requirement for a long time, and the qualified rate of the layered injection allocation is greatly improved; the water distributor can monitor production dynamic data such as underground layered flow, oil pipe pressure, formation pressure and the like for a long time.
3) The automation and the intellectualization level of the stratified water injection are greatly improved, the stratified water measurement and regulation, the water well management and the dynamic monitoring data of the stratified water injection well are mastered in time, and a foundation is laid for big data processing and application.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of a downhole intelligent zonal injection string;
FIG. 2 is a schematic view of the intelligent water distributor of the present invention;
FIG. 3 is a partial schematic view of an intelligent water distributor;
FIG. 4 is a schematic diagram of an intelligent water distributor battery assembly configuration;
FIG. 5 is a schematic view of a downhole bailer configuration;
FIG. 6 is a schematic view of the connection of the downhole bailer to the battery assembly;
FIG. 7 is a schematic diagram of a battery assembly;
FIG. 8 is a schematic view of the battery assembly entering the cavity of the downhole bailer.
Description of reference numerals:
1. an upper joint; 2. an outer protecting pipe; 3. a seal checking and measuring unit; 4. a water nozzle assembly; 5. a motor control unit; 6. a flow rate measurement unit; 7. a data processing unit; 8. a water outlet; 9. an overflow channel; 10. a water inlet; 11. a lower joint; 12. a battery assembly; 13. an induction coil; 14. a fishing rod; 15. a limiting block; 16. a battery compartment; 17. a wellhead of the water injection well; 18. a casing protection packer; 19. a first intelligent water distributor; 20. an interlayer packer; 21. a second intelligent water distributor; 22. presetting a working barrel; 23. a double-acting valve; 24. a screen pipe; 25. plugging with a thread; 26. a first locking structure; 27. a first spring; 28. a second locking structure; 29. a second spring; 30. salvaging the arm; 31. a guide arm; 32. a cavity; 33. a downhole throwing and fishing device; 34. an eccentric hole.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the present invention, the upper, lower, left and right in the drawings are regarded as the upper, lower, left and right of the downhole separated layer water injection process system described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a downhole separate-zone water injection process system which comprises a downhole intelligent separate-zone water injection pipe column and a downhole fishing device 33, wherein the downhole intelligent separate-zone water injection pipe column comprises a casing protection packer 18, an intelligent water distributor, a preset working barrel 22, a double-acting valve 23, a sieve pipe 24 and a plug 25 which are sequentially connected from top to bottom, one or more intelligent water distributors are provided, and an interlayer packer 20 is arranged between every two adjacent intelligent water distributors;
the intelligent water distributor comprises a water nozzle assembly and a battery assembly 12, and the underground throwing and fishing device 33 is used for fishing and throwing the battery assembly 12.
The downhole intelligent separate zone water injection string is shown in figure 1. The intelligent water distributor comprises a first intelligent water distributor 19 and a second intelligent water distributor 21.
Specifically, the working process or the application process of the downhole separated layer water injection process system provided by the embodiment is as follows:
when the electric quantity of the battery assembly 12 is exhausted, the underground throwing and fishing device 33 can be put into the well to pull the battery assembly 12 in the intelligent water distributor out of the ground, then the new battery assembly 12 with sufficient electric quantity is replaced and thrown and installed in the intelligent water distributor, the process greatly improves the automation and the intelligentization level of the stratified water injection, timely grasps the stratified water measurement and regulation, water well management and dynamic monitoring data of the stratified water injection well, and lays a foundation for big data processing and application.
Example 2:
on the basis of embodiment 1, this embodiment provides a process system for downhole stratified water injection, where the intelligent water distributor includes an upper connector 1, an outer protection pipe 2, and a lower connector 11, which are sequentially connected from top to bottom, an overflow channel 9 is provided in the outer protection pipe 2, and a motor control unit 5, a flow measurement unit 6, a data processing unit 7, a water nozzle assembly, and a battery assembly 12 are provided in an eccentric hole 3 between the outer protection pipe 2 and the overflow channel 9;
the flow measurement unit 6, the motor control unit 5 and the battery assembly 12 are electrically connected with the data processing unit 7, the motor control unit 5 and the battery assembly 12 are electrically connected with the water nozzle assembly, the data processing unit 7 is used for receiving a flow signal of the flow measurement unit 6, comparing the flow signal with a preset injection allocation amount, and sending a signal to the motor control unit 5 and the battery assembly 12 when a phase difference is out of an error range, and the motor control unit 5 is used for adjusting the water nozzle assembly according to the signal of the data processing unit 7. As shown in fig. 2 and 3.
The upper connector 1 and the lower connector 11 of the intelligent water distributor are connected with the overflow channel 9 through screw threads so as to fix the main structure of the water distributor and achieve a sealed instrument, and electric element groups such as the motor control unit 5, the flow measurement unit 6, the data processing unit 7, the battery assembly 12, the induction coil 13 and the like are integrated in an annular space (an eccentric hole 34) formed by the overflow channel 9 and the pressure-bearing outer pipe. The upper joint 1, the lower joint 11 and the electric appliance element group adopt a plug-in connection mode, and the joints are sealed by O-shaped sealing rings.
Specifically, the working process or the application process of the downhole separated layer water injection process system provided by the embodiment is as follows:
the injected water flows in from the upper joint 1, part of the water flows to the lower layer from the lower joint 11, part of the water flows in from the water inlet 10 and flows into the flow measuring unit 6, then the water flows out from the water outlet 8 and enters the stratum, the flow meter can calculate the flow rate of the water flowing through, then the flow rate is compared with the preset geological injection rate, when the calculated flow rate is out of an error range with the geological injection rate, the motor battery supplies power to prompt the water nozzle assembly to be opened or closed, the water nozzle adjusting process is executed, the layered injection rate is ensured to reach the layered injection rate requirement for a long time, and the monitored layered flow rate and the layered pressure can be stored in the water distributor, so that the downhole monitoring of the layered dynamic parameters and the automatic allocation of.
Example 3:
on the basis of embodiment 1, the present embodiment provides a process system for downhole separated layer water injection, where the downhole bailer 33 includes a housing, and the housing is provided with, from top to bottom, a first locking structure 26, a fishing arm 30, a cavity 32, a second locking structure 28, a guide arm 31, a first spring 27, and a second spring 29, where the first locking structure 26 is connected to the fishing arm 30, the first spring 27 is provided between the first locking structure 26 and the fishing arm 30, the second locking structure 28 is connected to the guide arm 31, and the second spring 29 is provided between the second locking structure 28 and the guide arm 31. As shown in fig. 5.
Specifically, the working process or the application process of the downhole separated layer water injection process system provided by the embodiment is as follows:
when the electric quantity of the intelligent water distributor is reduced to be incapable of working, a cable of a cable well testing vehicle is connected with the underground throwing and fishing device 33, when fishing is carried out, and the intelligent water distributor passes through a target layer, the underground throwing and fishing device 33 is lifted, the first locking structure 26 and the second locking structure 28 are blocked and opened, and the fishing arm 30 and the guide arm 31 are respectively opened under the action of the first spring 27 and the second spring 29; after the throwing and fishing claw at the lower end of the fishing arm 30 is connected with the battery assembly 12, the underground throwing and fishing device 33 is lifted upwards, the battery assembly 12 is taken out of an eccentric hole 34 of the intelligent water distributor, the battery assembly 12 is withdrawn into a cavity 32 of the underground throwing and fishing device 33 after being lifted, and the battery assembly 12 is lifted to the ground by lifting a cable on a test vehicle;
when the cable well testing vehicle is thrown in, the cable well testing vehicle is connected with the underground throwing and fishing device 33 and is put into an oil pipe of a water injection well, when the intelligent water distributor of a layer passes through the hole, the underground throwing and fishing device 33 is lifted, the first locking structure 26 and the second locking structure 28 are blocked and opened, and the fishing arm 30 and the guide arm 31 are respectively opened under the action of the first spring 27 and the second spring 29; the battery assembly 12 is sent to the position downwards, after the throwing and fishing claw is separated from the battery assembly 12, the underground throwing and fishing device 33 is lifted upwards, and the battery assembly 12 is sent into the eccentric hole 3 of the water distributor.
Example 4:
on the basis of embodiment 1, this embodiment provides a layering water injection process systems in pit, battery assembly 12 includes fishing rod 14, stopper 15 and battery compartment 16 that from last to connecting gradually down, battery compartment 16 lower part is equipped with induction coil 13. As shown in fig. 4.
When the underground throwing and fishing device 33 goes into the well and reaches the position near the intelligent water distributor, the underground throwing and fishing device can be in wireless communication with the induction coil 13, and then data inside the intelligent water distributor is recorded.
Example 5:
on the basis of the embodiment 2, the embodiment provides a downhole separated layer water injection process system, and the flow measurement unit 6 is an orifice plate differential pressure flowmeter.
The flow rate measurement unit 6 is a miniaturized orifice plate differential pressure flowmeter, and is screwed with the lower joint 11.
And a seal checking and measuring unit 3 is also arranged in an annular space between the outer protecting pipe 2 and the overflowing channel 9.
The seal checking and measuring unit 3 can realize real-time seal checking of the interlayer packer 20 and judge whether the packer is normally sealed. The seal checking and measuring unit 3 belongs to the prior art.
Example 6:
the embodiment provides a downhole separate layer water injection process method, which adopts a downhole separate layer water injection process system, injected water flows in from an upper connector 1, part of the water flows to a lower layer from a lower connector 11, part of the water flows in a flow measurement unit 6 from a water inlet 10, then flows out from a water outlet 8 and enters a stratum, the flow measurement unit 6 calculates the flow rate of the flowing water, then the flow rate is compared with the preset injection allocation amount, when the difference between the two is out of an error range, a signal is sent to a motor control unit 5 and a battery assembly 12, the motor control unit 5 controls a motor to adjust a water nozzle assembly to be opened or closed, the water nozzle adjusting process is executed, and the separate layer water injection amount is ensured to meet the separate layer injection allocation requirement for.
Meanwhile, the monitored layered flow and the monitored layered pressure can be stored in the water distributor, so that the underground monitoring of layered dynamic parameters and the automatic allocation of the layered flow are finally realized, and the qualified rate of layered injection allocation is greatly improved.
Example 7:
the embodiment provides a downhole separate layer water injection process method, which comprises the following steps:
the method comprises the following steps: tool run completion
According to the design of the pipe column, connecting an oil pipe, putting the oil pipe into a shaft, and pressing a seat seal by a packer to complete construction and well completion. Before the intelligent water distributor goes into the well, water injection parameters and a working system are set, and the parameters comprise automatic water nozzle opening time, automatic measuring and adjusting error range, automatic measuring and adjusting period and automatic seal checking period.
Step two: automatic measuring and regulating
The intelligent water distributor automatically opens the water nozzle according to preset automatic opening time, and simultaneously, the water injection flow is manually opened on the ground, so that normal water injection is realized. When the layered flow is tested by the flow measuring unit 6 according to a preset automatic testing and adjusting period, the data processing unit 7 compares the test value with a preset value, and automatically tests and adjusts the layered flow by combining a set error standard so as to reach the layered injection allocation requirement and realize the automatic testing and adjusting of the layered flow.
Step three: automatic seal inspection
The intelligent water distributor automatically controls the water nozzle to be closed according to preset automatic seal testing time, and meanwhile, the ground controller carries out switch control operation to establish a seal testing curve and obtain a seal testing result of the packer according to seal testing requirements.
Step four: downhole battery throwing, dragging and throwing
When the electric quantity of the intelligent water distributor is reduced to be incapable of working, a cable of a cable well testing vehicle is connected with the underground throwing and fishing device 33, when fishing is carried out, and the intelligent water distributor passes through a target layer, the underground throwing and fishing device 33 is lifted, the first locking structure 26 and the second locking structure 28 are blocked and opened, and the fishing arm 30 and the guide arm 31 are respectively opened under the action of the first spring 27 and the second spring 29; after the throwing and fishing claw at the lower end of the fishing arm 30 is connected with the battery assembly 12 (as shown in fig. 6), the downhole throwing and fishing device 33 is lifted upwards, the battery assembly 12 is taken out of an eccentric hole 34 of the intelligent water distributor, after the battery assembly 12 is lifted out (as shown in fig. 7), the battery assembly is withdrawn into a cavity 32 of the downhole throwing and fishing device 33 (as shown in fig. 8), and the battery assembly 12 is lifted out to the ground by lifting a cable on a test vehicle;
when the cable well testing vehicle is thrown in, the cable well testing vehicle is connected with the underground throwing and fishing device 33 and is put into an oil pipe of a water injection well, when the intelligent water distributor of a layer passes through the hole, the underground throwing and fishing device 33 is lifted, the first locking structure 26 and the second locking structure 28 are blocked and opened, and the fishing arm 30 and the guide arm 31 are respectively opened under the action of the first spring 27 and the second spring 29; the battery assembly 12 is lowered into position, and after the grappling claw is separated from the battery assembly 12, the downhole grappling device 33 is lifted upwardly to feed the battery assembly 12 into the eccentric hole 34 of the water distributor.
Step five: well flushing
In order to ensure that impurities are not accumulated in the water nozzles and the overflowing channel 99 of the automatic water distribution structure and realize normal water injection, reverse circulation well washing is adopted to clean the shaft environment.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice. Components and structures not described in detail in the embodiments are those well-known in the art and commonly used structures or commonly used means, which are not all specifically described herein.
Claims (10)
1. A downhole separate layer water injection process system is characterized in that: the underground intelligent separate-layer water injection pipe column comprises one or more intelligent water distributors, and an interlayer packer (20) is arranged between every two adjacent intelligent water distributors, wherein the underground intelligent separate-layer water injection pipe column comprises a casing protection packer (18), the intelligent water distributors, a preset working barrel (22), a double-acting valve (23), a sieve pipe (24) and a plug (25) which are sequentially connected from top to bottom;
the intelligent water distributor comprises a water nozzle assembly (4) and a battery assembly (12), and the underground throwing and fishing device (33) is used for fishing and throwing the battery assembly (12).
2. The downhole separated layer water injection process system according to claim 1, wherein: the intelligent water distributor comprises an upper connector (1), an outer protecting pipe (2) and a lower connector (11) which are sequentially connected from top to bottom, wherein an overflowing channel (9) is arranged in the outer protecting pipe (2), and a motor control unit (5), a flow measuring unit (6), a data processing unit (7), a water nozzle assembly (4) and a battery assembly (12) are arranged in an eccentric hole (34) between the outer protecting pipe (2) and the overflowing channel (9);
the flow measurement unit (6), the motor control unit (5) and the battery assembly (12) are electrically connected with the data processing unit (7), the motor control unit (5) and the battery assembly (12) are electrically connected with the water nozzle assembly (4), the data processing unit (7) is used for receiving a flow signal of the flow measurement unit (6) and comparing the flow signal with a preset injection allocation amount, when the phase difference is out of an error range, a signal is sent to the motor control unit (5) and the battery assembly (12), and the motor control unit (5) is used for adjusting the water nozzle assembly (4) according to the signal of the data processing unit (7).
3. A downhole separated layer water injection process system according to claim 2, wherein: the underground fishing device (33) comprises a shell, wherein the shell is provided with a first locking structure (26), a fishing arm (30), a cavity (32), a second locking structure (28) and a guide arm (31) from top to bottom, the first spring (27) and the second spring (29) are arranged on the shell, the first locking structure (26) is connected with the fishing arm (30), the first spring (27) is arranged between the first locking structure (26) and the fishing arm (30), the second locking structure (28) is connected with the guide arm (31), and the second spring (29) is arranged between the second locking structure (28) and the guide arm (31).
4. A downhole separated layer water injection process system according to claim 2, wherein: battery assembly (12) include from last fishing rod (14), stopper (15) and battery compartment (16) to connecting gradually down, battery compartment (16) lower part is equipped with induction coil (13).
5. A downhole separated layer water injection process system according to claim 2, wherein: the flow measuring unit (6) is a pore plate differential pressure flowmeter.
6. A downhole separated layer water injection process system according to claim 2, wherein: and a seal checking measurement unit (3) is further arranged in an annular space between the outer protective pipe (2) and the overflowing channel (9).
7. A downhole separate water injection process method, which adopts the downhole separate water injection process system of claim 3, and is characterized in that: the injected water flows in from the upper connector (1), part of the water flows to the lower layer from the lower connector (11), part of the water flows into the flow measuring unit (6) from the water inlet (10), then flows out from the water outlet (8) and enters the stratum, the flow measuring unit (6) calculates the flow rate of the water flowing through, then the flow rate is compared with the preset injection allocation amount, when the difference between the flow rate and the preset injection allocation amount is out of an error range, a signal is sent to the motor control unit (5) and the battery assembly (12), the motor control unit (5) controls the motor to adjust the opening or closing of the water nozzle assembly (4), the water nozzle adjusting process is executed, and the layered injection amount is ensured to meet the layered injection allocation requirement for a.
8. The downhole separate layer water injection process method according to claim 7, characterized in that: before the intelligent water distributor goes into the well, water injection parameters and a working system are set.
9. The downhole separate layer water injection process method according to claim 8, characterized in that: the working system comprises the time for automatically opening the water nozzle, the error range of automatic measurement and adjustment, the period of automatic measurement and adjustment and the period parameter of automatic seal inspection.
10. The downhole separate layer water injection process method according to claim 7, characterized in that: when the electric quantity of the intelligent water distributor is reduced to be incapable of working, a cable of a cable well testing vehicle is connected with the underground throwing and fishing device (33), when fishing is carried out, and the intelligent water distributor passes through a target layer, the underground throwing and fishing device (33) is lifted, the first locking structure (26) and the second locking structure (28) are blocked and opened, and the fishing arm (30) and the guide arm (31) are opened under the action of the first spring (27) and the second spring (29) respectively; after a throwing and fishing claw at the lower end of the fishing arm (30) is connected with the battery assembly (12), the underground throwing and fishing device (33) is lifted upwards, the battery assembly (12) is taken out of an eccentric hole (34) of the intelligent water distributor, the battery assembly (12) is withdrawn into a cavity (32) of the underground throwing and fishing device (33) after being lifted, and a cable is lifted by a test vehicle to lift the battery assembly (12) to the ground;
when the cable well testing vehicle is thrown, the cable well testing vehicle is connected with an underground throwing and fishing device (33) and is put into an oil pipe of a water injection well, when the intelligent water distributor of a layer passes through the well, the underground throwing and fishing device (33) is lifted, the first locking structure (26) and the second locking structure (28) are blocked and opened, and the fishing arm (30) and the guide arm (31) are respectively opened under the action of the first spring (27) and the second spring (29); the battery assembly (12) is sent to the position downwards, after the throwing and fishing claw is separated from the battery assembly (12), the underground throwing and fishing device (33) is lifted upwards, and the battery assembly (12) is sent into an eccentric hole (34) of the water distributor.
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Application publication date: 20200403 |