CN112228021A - Bridge type concentric constant-current water injection system and control method - Google Patents
Bridge type concentric constant-current water injection system and control method Download PDFInfo
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- CN112228021A CN112228021A CN202011146494.6A CN202011146494A CN112228021A CN 112228021 A CN112228021 A CN 112228021A CN 202011146494 A CN202011146494 A CN 202011146494A CN 112228021 A CN112228021 A CN 112228021A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention provides a bridge type concentric constant-current water injection system and a control method thereof. The invention adjusts the stratified water quantity through the ground constant pressure control system and the constant flow mechanism of the constant flow water distributor, and keeps the stratified flow stable, thereby ensuring that the qualified rate of the stratified water injection keeps a higher level. When the ground water injection system pressure fluctuates and the ground constant-pressure control valve is not recovered in time, the constant-current mechanism of the constant-current water distributor comprehensively acts with the internal pressure of the overflowing fixed pressing piece through the elastic force of the spring and controls the change of the layered flow through the telescopic control of the valve rod, so that the gap between the valve rod and the overflowing hole in the two centers of the valve seat is changed to control the layered flow, the layered flow is automatically adjusted, and the flow is kept stable.
Description
Technical Field
The invention belongs to the technical field of oilfield water injection, and particularly relates to a bridge type concentric constant-current water injection system and a control method.
Background
In order to realize fine and efficient water injection in an oil field, the domestic oil field water injection system mostly adopts the modes of ground constant-current water injection and underground mechanical layered flow control, and the system mainly comprises two parts, namely a ground part and an underground part. The ground part is mainly a ground flow stabilizing valve group which is used for ensuring that the flow of the whole well meets the injection allocation requirement and realizing the standard-reaching water injection of the whole well. The underground part is mainly a separate injection pipe column consisting of a water distributor and a packer 30, the key tool for water distribution is the water distributor, and the opening degree of a water nozzle of the water distributor is adjusted by a measuring and adjusting instrument, so that the layered flow can meet the injection distribution requirement, and the layered water injection reaching the standard is realized.
The existing commonly used water distributors mainly comprise two types, one type is a bridge type eccentric water distributor, the eccentric structure design of an underground water distribution water nozzle and an injection distributor is adopted, the water nozzle can be used for throwing and fishing, and the technology has high application difficulty and poor implementation effect in the conditions of a highly-deviated well and a multi-layer separate injection well. The other type is a bridge type concentric water distributor, the integrated design of an underground water distribution water nozzle and the water distributor is adopted, concentric test and concentric adjustment are carried out, and the technology has a good application effect in a highly-deviated well and a multilayer separate injection well.
However, the conventional water distributor can only adjust the layered flow by manually adjusting the opening of the water nozzle, and cannot automatically adjust the layered flow, so that the layered qualification rate cannot be ensured after the pressure of a water injection system fluctuates, and the separate injection qualification rate is reduced quickly.
Disclosure of Invention
The invention aims to provide a bridge type concentric constant-current water injection system, which overcomes the technical problems in the prior art.
The invention also aims to provide a bridge type concentric constant-current water injection control method, which automatically adjusts the underground layered flow through the integrated constant-current water distributor, thereby ensuring that the qualified rate of the layered water injection is kept at a higher level.
Therefore, the technical scheme provided by the invention is as follows:
a bridge type concentric constant-current water injection system comprises a ground constant-pressure control system and an underground integrated constant-current water distribution pipe column, wherein the ground constant-pressure control system is communicated with the underground integrated constant-current water distribution pipe column, the underground integrated constant-current water distribution pipe column comprises an oil pipe, a plurality of constant-current water distributors and packers, and one packer is arranged between every two adjacent constant-current water distributors.
The constant-flow water distributor comprises an upper joint, an upper sleeve, an intermediate connecting cylinder and a lower joint which are sequentially connected from top to bottom;
an upper connecting barrel accessory is sleeved in the upper joint, the lower end of the upper connecting barrel accessory is supported at the upper section of the upper sleeve, a fixed shaft is sleeved in the upper sleeve and fixedly connected with an upper pressing cap, an overflowing fixed pressing piece is arranged on the upper pressing cap and communicated with a central channel, the lower end of the upper pressing cap is connected with an intermediate joint, the intermediate joint is arranged in the intermediate connecting barrel and connected with a lower support body through a lower pressing cap, a constant-current mechanism is arranged in the intermediate joint, and the upper pressing cap, the intermediate joint, the lower pressing cap and the lower support body are all provided with overflowing holes and are sequentially communicated to form an overflowing channel;
the internal portion of under bracing is equipped with fixed water injection well choke, the internal drive shaft that is connected with of under bracing, be fixed with movable water injection well choke on the drive shaft, movable water injection well choke and fixed water injection well choke concentric surface are sealed, fixed water injection well choke inboard is located to the movable water injection well choke, fixed water injection well choke is equipped with inside exhalant canal, this inside exhalant canal with overflow the passageway intercommunication.
The ground constant pressure control system comprises a water inlet valve, an ultrasonic flowmeter 25, a ground constant pressure control valve, a water injection valve and a water injection wellhead which are sequentially communicated through pipelines.
The constant-current mechanism comprises a valve cylinder I, a valve rod, a valve cylinder II, a valve seat I, a valve cylinder III, a valve seat II and a valve cylinder IV, wherein the upper end of the valve cylinder I is pressed by an upper pressing cap, the lower end of the valve cylinder I is butted with two surfaces of the valve cylinder, the lower end of the valve cylinder II is connected with the valve seat I, the lower end of the valve seat is connected with the valve cylinder III, a circular water outlet is formed in the valve cylinder III, the lower end of the valve cylinder III is connected with the valve seat II, the lower end of the valve seat II is connected with the valve cylinder IV; the valve rod adopts a multi-stage trapezoidal structure, sequentially passes through central overflowing holes of the first valve cylinder, the second valve cylinder, the first valve seat, the third valve cylinder, the second valve seat and the fourth valve cylinder, and the lower end of the valve rod is connected with the pressure regulating spring.
The lower end of the driving shaft is sleeved with a protective cylinder.
A bridge type concentric constant-current water injection control method adopts a bridge type concentric constant-current water injection system, and comprises the following steps:
step 1) the integrated testing and adjusting instrument is electrically connected with a ground controller to test and adjust the constant-current water distributor, so that the layered flow reaches the injection allocation requirement, and constant-pressure water injection is carried out through a bridge type concentric constant-current water injection system;
and 2) in the water injection process, when the pressure of a ground water injection system fluctuates and a ground constant pressure control valve of a ground constant pressure control system is not recovered in time, automatically adjusting through an overflowing constant pressure piece and a constant flow mechanism to keep the layered flow stable.
The measuring and adjusting process in the step 1) is as follows:
the first step is as follows: the ground controller is connected with an integrated testing and adjusting instrument through a cable and is put into the water injection well, and a positioning claw and an adjusting claw of the integrated testing and adjusting instrument are in positioning butt joint with a positioning shaft and a driving shaft of the constant-current water distributor respectively;
the second step is that: the ground controller controls the integrated test adjusting instrument to rotate to drive the driving shaft to rotate, so that the relative motion between the movable water nozzle and the fixed water nozzle is realized, and the size of the water outlet is changed;
the third step: observing the change of the layered flow through a ground controller, and enabling the layered flow to meet the injection allocation requirement by continuously adjusting the size of a water outlet;
the fourth step: and (5) taking out the integrated instrument by testing and allocating personnel to carry out constant-pressure water injection.
When the ground water injection system pressure rises, the internal pressure of the overflowing constant pressure part rises, the valve rod is pushed to move downwards, the valve rod and the overflowing constant pressure part restore balance under the action of the elastic force of the pressure regulating spring, the gap between the valve rod and the overflowing hole in the center of the valve seat is reduced, and the layered flow is kept stable.
In the water injection process, when the pressure of a ground water injection system is reduced, the internal pressure of the overflowing constant pressure part is reduced, the valve rod is pushed to move upwards, the valve rod and the overflowing constant pressure part restore balance again under the action of the elastic force of the pressure regulating spring, the gap between the valve rod and the overflowing hole in the center of the valve seat is increased, and the layered flow is kept stable.
The invention has the beneficial effects that:
the concentric constant-flow water injection system provided by the invention adjusts the stratified water quantity through the ground constant-pressure control system and the constant-flow mechanism of the constant-flow water distributor, and keeps the stratified flow stable, thereby ensuring that the qualified rate of the stratified water injection keeps a higher level. When the ground water injection system pressure fluctuates and the ground constant-pressure control valve is not recovered in time, the constant-current mechanism of the constant-current water distributor comprehensively acts with the internal pressure of the overflowing fixed pressing piece through the elastic force of the spring and controls the change of the layered flow through the telescopic control of the valve rod, so that the gap between the valve rod and the overflowing hole in the two centers of the valve seat is changed to control the layered flow, the layered flow is automatically adjusted, and the flow is kept stable.
When the flow rate is measured and adjusted, the adjusting claw of the integrated testing and adjusting instrument is in butt joint with the driving shaft of the constant-current water distributor, the integrated testing and adjusting instrument is controlled to rotate through the ground controller, the driving shaft is driven to rotate, relative movement between the movable water nozzle and the fixed water nozzle is further realized, the size of the water outlet is changed, the layered flow rate meets the injection allocation requirement, and the adjustment is convenient through the bridge type concentric constant-current water injection system.
The following will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a constant flow water distributor of the present invention;
FIG. 2 is a schematic structural diagram of one embodiment of a bridge-type concentric constant-flow water injection system according to the present invention;
fig. 3 is a schematic diagram of the measuring and adjusting process of the constant-flow water distributor.
In the figure: 1. an upper joint; 2. an upper connecting cylinder accessory; 3. an upper sleeve; 4. a fixed shaft; 5. pressing the cap upwards; 6. an intermediate joint; 7. pressing down the cap; 8. fixing the water nozzle; 9. an intermediate connecting cylinder; 10. a movable water nozzle; 11. a drive shaft; 12. a protective cylinder; 13. a lower joint; 14. an overflowing fixed pressing piece; 15. a first valve cylinder; 16. a valve stem; 17. a second valve cylinder; 18. a first valve seat; 19. a third valve cylinder; 20. a second valve seat; 21. a valve cylinder IV; 22. a pressure regulating spring; 23. a lower support; 24. a ground constant pressure control valve; 25. an ultrasonic flow meter; 26. an incoming water valve; 27. a water injection valve; 28. a water injection well mouth; 29. a first constant-flow water distributor; 30. a packer; 31. a second constant-flow water distributor; 32. A tool positioning mechanism; 33. a flow regulating mechanism.
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.
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 bridge type concentric constant-current water injection system, which comprises a ground constant-pressure control system and an underground integrated constant-current water distribution pipe column, wherein the ground constant-pressure control system is communicated with the underground integrated constant-current water distribution pipe column, the underground integrated constant-current water distribution pipe column comprises an oil pipe, a plurality of constant-current water distributors and a packer 30, and the packer 30 is arranged between every two adjacent constant-current water distributors.
The concentric constant-flow water injection system provided by the invention adjusts the stratified water quantity through the ground constant-pressure control system and the constant-flow mechanism of the constant-flow water distributor, and keeps the stratified flow stable, thereby ensuring that the qualified rate of the stratified water injection keeps a higher level.
Example 2:
on the basis of embodiment 1, the present embodiment provides a bridge type concentric constant-flow water injection system, where the constant-flow water distributor includes an upper joint 1, an upper sleeve 3, an intermediate connecting cylinder 9, and a lower joint 13, which are sequentially connected from top to bottom;
an upper connecting barrel accessory 2 is sleeved in the upper joint 1, the lower end of the upper connecting barrel accessory 2 is supported at the upper section of an upper sleeve 3, a fixed shaft 4 is sleeved in the upper sleeve 3, the fixed shaft 4 is fixedly connected with an upper pressing cap 5, an overflowing fixed pressing piece 14 is arranged on the upper pressing cap 5, the overflowing fixed pressing piece 14 is communicated with a central channel, the lower end of the upper pressing cap 5 is connected with an intermediate joint 6, the intermediate joint 6 is arranged in an intermediate connecting barrel 9, the intermediate joint 6 is connected with a lower supporting body 23 through a lower pressing cap 7, a constant-current mechanism is arranged in the intermediate joint 6, and the upper pressing cap 5, the intermediate joint 6, the lower pressing cap 7 and the lower supporting body 23 are all provided with overflowing holes and are sequentially communicated to form an overflowing channel;
the inside fixed water injection well choke 8 that is equipped with of bottom suspension body 23, be connected with drive shaft 11 in the bottom suspension body 23, be fixed with movable water injection well choke 10 on the drive shaft 11, movable water injection well choke 10 is sealed with fixed water injection well choke 8 concentric surface, movable water injection well choke 10 is located fixed water injection well choke 8 inboardly, fixed water injection well choke 8 is equipped with inside exhalant canal, this inside exhalant canal with flow through the passageway intercommunication.
The upper end of the upper joint 1 is connected with an oil pipe in a threaded manner, the lower end of the upper joint is connected with the upper sleeve 3, and the lower end of the upper sleeve 3 is connected with the lower joint 13 in a threaded manner through the middle connecting cylinder 9, so that the external structure of the constant-flow water distributor is formed, and tools are protected and supported.
When the pressure of the ground water injection system fluctuates and the ground constant pressure control valve 24 is not recovered in time, the layered flow is automatically adjusted through the comprehensive action of the constant flow mechanism of the constant flow water distributor and the internal pressure of the overflowing fixed pressing part 14, so that the flow is kept stable.
Example 3:
on the basis of embodiment 1, the present embodiment provides a bridge type concentric constant-flow water injection system, and the ground constant-pressure control system comprises an incoming water valve 26, an ultrasonic flowmeter 25, a ground constant-pressure control valve 24, a water injection valve 27 and a water injection wellhead 28 which are sequentially communicated through pipelines.
As shown in fig. 2, the flow rate of the injected water is controlled and monitored in real time by an ultrasonic flow meter 25 and a ground constant pressure control valve 24, so that the flow rate is kept constant.
Example 4:
on the basis of embodiment 2, the present embodiment provides a bridge type concentric constant-current water injection system, as shown in fig. 1, the constant-current mechanism includes a first valve barrel 15, a valve rod 16, a second valve barrel 17, a first valve seat 18, a third valve barrel 19, a second valve seat 20, and a fourth valve barrel 21, an upper end of the first valve barrel 15 is pressed by an upper press cap 5, a lower end of the first valve barrel 15 is in butt joint with a surface of the second valve barrel 17, a lower end of the second valve barrel 17 is connected with the first valve seat 18, a lower end of the first valve seat 18 is connected with the third valve barrel 19, the third valve barrel 19 is provided with a circular water outlet, a lower end of the third valve barrel 19 is connected with the second valve seat 20, a lower end of the second valve seat 20 is; the valve rod 16 adopts a multi-stage trapezoidal structure and sequentially passes through central overflowing holes of a first valve cylinder 15, a second valve cylinder 17, a first valve seat 18, a third valve cylinder 19, a second valve seat 20 and a fourth valve cylinder 21, and the lower end of the valve rod 16 is connected with a pressure regulating spring 22.
When the ground water injection system pressure fluctuates and the ground constant pressure control valve 24 is not recovered in time, the underground layered flow changes, the constant flow mechanism controls the layered flow change by comprehensively acting the spring force and the internal pressure of the overflowing fixed pressing part 14 and by controlling the expansion and contraction of the valve rod 16, the gap between the valve rod 16 and the overflowing hole in the center of the valve seat II 20 is further changed, the layered flow is automatically adjusted, and the flow stability is kept.
Example 5:
on the basis of embodiment 2, this embodiment provides a bridge type concentric constant-flow water injection system, as shown in fig. 2, a protective sleeve 12 is sleeved on the lower end of the driving shaft 11.
As shown in fig. 1, a protective tube 12 is sleeved on the lower end of the driving shaft 11 for centering and protecting.
Example 6:
on the basis of embodiment 1, this embodiment provides a bridge type concentric constant-current water injection system, which includes a ground constant-pressure control system and an underground integrated constant-current water distribution pipe column, where the ground constant-pressure control system is communicated with the underground integrated constant-current water distribution pipe column, as shown in fig. 2.
The downhole integrated constant-flow water distribution pipe column comprises an oil pipe, a plurality of constant-flow water distributors and a packer 30, wherein one packer 30 is arranged between every two adjacent constant-flow water distributors. As shown in FIG. 2, the first constant flow water distributor 29 and the second constant flow water distributor 31 are sealed by a packer 30 to carry out separated layer water injection.
As shown in fig. 1, the constant-flow water distributor comprises an upper connector 1, an upper connecting cylinder accessory 2, an upper sleeve 3, a fixed shaft 4, an upper pressing cap 5, an intermediate connector 6, a lower pressing cap 7, an intermediate connecting cylinder 9, a movable water nozzle 10, a driving shaft 11, a protection cylinder 12, a lower connector 13, an overflowing fixed pressing piece 14, a valve cylinder I15, a valve rod 16, a valve cylinder II 17, a valve seat I18, a valve cylinder III 19, a valve seat II 20, a valve cylinder IV 21, a pressure regulating spring 22 and a lower supporting body 23, wherein the overflowing fixed pressing piece 14, the valve cylinder I15, the valve rod 16, the valve cylinder II 17, the valve seat I18, the valve cylinder III 19, the valve seat II 20, the valve cylinder IV 21, the pressure regulating spring 22 and the lower supporting body 23 form a downhole constant-flow mechanism for automatically regulating layered water quantity.
The upper end of the upper joint 1 is connected with an oil pipe through a screw thread, the lower end of the upper joint is connected with the upper sleeve 3, and the lower end of the upper sleeve 3 is connected with the lower joint 13 through an intermediate connecting cylinder 9 through a screw thread, so that an external structure of the concentric constant-current integrated water distributor is formed, and tools are protected and supported. The intermediate joint 6 is fixed to the intermediate connecting cylinder 9 by fixing screws to prevent mutual rotation. The upper connecting cylinder accessory 2 is sleeved inside the upper connector 1, and the lower end of the upper connecting cylinder accessory is supported on the upper section of the upper sleeve 3, so that the guiding and righting functions of the integrated testing and adjusting instrument are realized in the testing and adjusting process. The concrete structure and composition of the integrated testing and adjusting instrument are shown in patent CN 105156093A, and the patent name is 'a bridge type concentric testing, adjusting, inspecting and sealing integrated testing instrument'.
The fixed shaft 4 is sleeved inside the upper sleeve 3, the lower end of the fixed shaft is inserted into the upper pressing cap 5 and fixed by the fixing pin, and the fixed shaft 4 is an integrated testing and adjusting instrument positioning and butt-joint mechanism to realize butt-joint and rotation prevention in testing, adjusting and sealing.
The lower surface of the upper pressure cap 5 is in butt joint with the surface of the middle joint 6, the lower end of the middle joint 6 is connected with the lower support body 23 through the lower pressure cap 7, and meanwhile, the upper pressure cap 5, the middle joint 6, the lower pressure cap 7 and the lower support body 23 are provided with overflowing holes to realize the overflowing effect of a bridge channel.
The upper part of the upper pressure cap 5 is designed with an overflowing constant pressure piece 14, the overflowing constant pressure piece 14 is an overflowing cavity body, and the overflowing cavity body, the inside of the water distributor and a central overflowing hole of a valve barrel I15 transmit pressure to a valve rod 16.
The upper part of the middle joint 6 is provided with a circular through hole, a first valve cylinder 15, a valve rod 16, a second valve cylinder 17, a first valve seat 18, a third valve cylinder 19, a second valve seat 20, a fourth valve cylinder 21 and a pressure regulating spring 22 are sleeved in the through hole, and all the parts and the hole surface are sealed by rubber rings. The upper end of the first valve cylinder 15 is pressed by the upper pressing cap 5, the lower end of the first valve cylinder is in butt joint with the second valve cylinder 17, the lower end of the second valve cylinder 17 is connected with the first valve seat 18, the lower end of the first valve seat 18 is connected with the third valve cylinder 19, a circular water outlet is formed in the third valve cylinder 19, the lower end of the third valve cylinder 19 is connected with the second valve seat 20, the lower end of the second valve seat 20 is connected with the fourth valve cylinder 21, and a pressure regulating spring 22 is arranged inside the. The lower support body 23 is connected with the lower part of the pressure regulating spring 22 and plays a role of supporting the pressure regulating spring 22.
The valve rod 16 adopts a multi-stage trapezoidal structural design, sequentially passes through central overflowing holes of a first valve barrel 15, a second valve barrel 17, a first valve seat 18, a third valve barrel 19, a second valve seat 20 and a fourth valve barrel 21, the lower end of the valve rod is connected with a pressure regulating spring 22, the telescopic control of the valve rod 16 is realized through the comprehensive action of the elastic force of the pressure regulating spring 22 and the internal pressure of the overflowing fixed pressing piece 14, and then the gap of the central overflowing holes of the valve rod 16 and the second valve seat 20 is changed to control the change of the layered flow.
The fixed water nozzle 8 is of a ceramic structure, is arranged in the lower support body 23, and is provided with an internal water outlet channel. The movable water nozzle 10 is bonded on the driving shaft 11 and sealed with the concentric surface of the fixed water nozzle 8, the driving shaft 11 is connected inside the lower support body 23 through a screw thread, and meanwhile, an adjusting groove is formed, so that concentric adjustment after butt joint with an integrated adjusting and measuring instrument is realized.
Example 7:
the embodiment provides a bridge type concentric constant-current water injection control method, which adopts a bridge type concentric constant-current water injection system and comprises the following steps:
step 1) the integrated testing and adjusting instrument is electrically connected with a ground controller to test and adjust the constant-current water distributor, so that the layered flow reaches the injection allocation requirement, and constant-pressure water injection is carried out through a bridge type concentric constant-current water injection system;
and 2) in the water injection process, when the pressure of a ground water injection system fluctuates and a ground constant pressure control valve 24 of a ground constant pressure control system is not recovered in time, the flow through the constant pressure piece 14 and the constant flow mechanism is automatically adjusted, so that the layered flow is kept stable.
Before the underground pipe column is started, measurement and regulation are firstly carried out to enable the flow of the separated layers to meet the injection allocation requirement, and constant-pressure water injection is carried out through a bridge type concentric constant-current water injection system. Under normal conditions, no water breakthrough occurs in the corresponding well group, and the stratified water injection amount does not change obviously under the condition that the water injection pressure is kept constant.
However, when the pressure of the ground water injection system fluctuates and the ground constant pressure control valve 24 is not recovered in time, the overflowing fixed pressure part 14 and the constant flow mechanism perform automatic adjustment, so that the layered flow change caused by the pressure change is relieved, and the layered flow is kept stable.
Example 8:
on the basis of embodiment 7, this embodiment provides a bridge type concentric constant-current water injection control method, and the measurement and adjustment process in step 1) is as follows:
the first step is as follows: the ground controller is connected with an integrated testing and adjusting instrument through a cable and is put into the water injection well, and a positioning claw and an adjusting claw of the integrated testing and adjusting instrument are respectively in positioning butt joint with a positioning shaft and a driving shaft 11 of the constant-current water distributor;
the second step is that: the ground controller controls the integrated test adjusting instrument to rotate to drive the driving shaft 11 to rotate, so that the movable water nozzle 10 and the fixed water nozzle 8 move relatively to change the size of the water outlet;
the third step: observing the change of the layered flow through a ground controller, and enabling the layered flow to meet the injection allocation requirement by continuously adjusting the size of a water outlet;
the fourth step: and (5) taking out the integrated instrument by testing and allocating personnel to carry out constant-pressure water injection.
The integrated testing and adjusting instrument (see patent CN 105156093A, the name of the patent is 'a bridge type concentric testing and adjusting seal-testing integrated testing instrument') can measure the water injection flow, transmit the flow data to a ground controller and then adjust the size of a water outlet according to the injection allocation requirement.
Example 9:
on the basis of embodiment 7, this embodiment provides a bridge-type concentric constant-current water injection control method, which includes the following processes:
according to the figures 2 and 3, the integrated constant-flow water distributor and packer 30 is lowered to a corresponding depth according to the design requirement, a water injection wellhead 28 is installed, and the separate injection string seat sealing is completed through ground pressurization.
The underground pipe column injection process:
the first step is as follows: a ground controller is adopted by a testing and allocating person to be connected with an integrated testing and adjusting instrument through a cable to be put into a water injection well, a tool positioning mechanism 32 of the integrated testing and adjusting instrument is in positioning butt joint with a positioning shaft of an integrated constant-current water distributor, and a flow adjusting mechanism 33 is in butt joint with a driving shaft 11.
The second step is that: the ground controller controls the underground integrated instrument to rotate to drive the driving shaft 11 to rotate, so that the relative movement between the movable water nozzle 10 and the fixed water nozzle 8 is realized, and the water nozzle is opened;
the third step: and (3) opening the water inlet valve 26 and the water injection valve 27 of the ground system, setting the water injection pressure value of the ground constant pressure control valve 24, starting the injection test of the separate injection well, and simultaneously testing the flow of the whole well by the high-precision ultrasonic flowmeter 25.
The underground layered flow adjusting process comprises the following steps:
the first step is as follows: a ground controller is adopted by a testing and allocating person to be connected with an integrated testing and adjusting instrument through a cable to be put into a water injection well, a positioning claw of the testing and adjusting instrument is in positioning butt joint with a positioning shaft of an integrated water distributor, and an adjusting claw is in butt joint with a driving shaft 11.
The second step is that: a test allocating person controls the underground integrated instrument to rotate by adopting a ground controller to drive the driving shaft 1111 to rotate, so that the relative movement between the movable water nozzle 10 and the fixed water nozzle 8 is realized, and the size of the water outlet is changed;
the third step: a test allocating worker observes the change of the layered flow through a ground controller and enables the layered flow to meet the injection allocation requirement by continuously adjusting the size of a water outlet;
the fourth step: and (5) taking out the integrated instrument by testing and allocating personnel, and recovering the constant-pressure water injection process.
The automatic adjustment process comprises the following steps:
under normal conditions, no water breakthrough occurs in the corresponding well group, and the stratified water injection amount does not change obviously under the condition that the water injection pressure is kept constant.
However, when the surface water injection system fluctuates and the surface constant pressure control valve 2424 is not recovered in time, the downhole layered flow changes, and the two situations are divided into two situations: one such pressure rise: the internal pressure of the overflowing fixed pressing piece 14 rises, the valve rod 16 is pushed to move downwards, the balance is restored through the action of the elastic force of the pressure regulating spring 22 and the overflowing fixed pressing piece 14, the gap between the valve rod 16 and the overflowing hole in the center of the second valve seat 20 is reduced, and the layered flow is kept stable. And in the other condition, the pressure is reduced, the internal pressure of the overflowing fixed pressing piece 14 is reduced, the valve rod 16 is pushed to move upwards, the balance is restored again through the action of the elastic force of the pressure regulating spring 22 and the overflowing fixed pressing piece 14, the gap between the valve rod 16 and the central overflowing hole of the valve seat II 20 is increased, and the layered flow is kept stable.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (9)
1. A bridge type concentric constant-current water injection system is characterized in that: the underground integrated constant-current water distribution pipe column comprises a ground constant-pressure control system and an underground integrated constant-current water distribution pipe column, wherein the ground constant-pressure control system is communicated with the underground integrated constant-current water distribution pipe column, the underground integrated constant-current water distribution pipe column comprises an oil pipe, a plurality of constant-current water distributors and a packer (30), and a packer (30) is arranged between every two adjacent constant-current water distributors.
2. The bridge type concentric constant-flow water injection system according to claim 1, wherein: the constant-flow water distributor comprises an upper joint (1), an upper sleeve (3), an intermediate connecting cylinder (9) and a lower joint (13) which are sequentially connected from top to bottom;
an upper connecting cylinder accessory (2) is sleeved in the upper joint (1), the lower end of the upper connecting cylinder accessory (2) is supported at the upper section of the upper sleeve (3), a fixed shaft (4) is sleeved in the upper sleeve (3), an upper pressing cap (5) is fixedly connected with the fixed shaft (4), an overflowing fixed and pressed piece (14) is arranged on the upper pressing cap (5), the overflowing fixed and pressed piece (14) is communicated with the central channel, the lower end of the upper pressing cap (5) is connected with an intermediate joint (6), the intermediate joint (6) is arranged in the intermediate connecting cylinder (9), the middle joint (6) is connected with a lower support body (23) through a lower pressing cap (7), a constant-current mechanism is arranged in the middle joint (6), and the upper pressure cap (5), the middle joint (6), the lower pressure cap (7) and the lower support body (23) are provided with overflowing holes which are communicated in sequence to form an overflowing channel;
the utility model discloses a water faucet, including bottom suspension body (23), bottom suspension body (23) inside fixed water injection well choke (8) of being equipped with, bottom suspension body (23) in-connection has drive shaft (11), be fixed with movable water injection well choke (10) on drive shaft (11), movable water injection well choke (10) are sealed with fixed water injection well choke (8) concentric surface, fixed water injection well choke (8) inboard is located in movable water injection well choke (10), fixed water injection well choke (8) are equipped with inside water outlet channel, this inside water outlet channel with flow through the passageway intercommunication.
3. The bridge type concentric constant-flow water injection system according to claim 1, wherein: the ground constant pressure control system comprises a water inlet valve (26), an ultrasonic flowmeter (25), a ground constant pressure control valve (24), a water injection valve (27) and a water injection wellhead (28) which are sequentially communicated through pipelines.
4. The bridge type concentric constant-flow water injection system according to claim 2, wherein: the constant-current mechanism comprises a first valve cylinder (15), a valve rod (16), a second valve cylinder (17), a first valve seat (18), a third valve cylinder (19), a second valve seat (20) and a fourth valve cylinder (21), the upper end of the first valve cylinder (15) is pressed by an upper pressing cap (5), the lower end of the first valve cylinder is in butt joint with the surface of the second valve cylinder (17), the lower end of the second valve cylinder (17) is connected with the first valve seat (18), the lower end of the first valve seat (18) is connected with the third valve cylinder (19), a circular water outlet is formed in the third valve cylinder (19), the lower end of the third valve cylinder (19) is connected with the second valve seat (20), the lower end of the second valve seat (20) is connected with the fourth valve cylinder (21), and a pressure; the valve rod (16) adopts a multi-stage trapezoidal structure, sequentially passes through the center overflowing holes of the first valve cylinder (15), the second valve cylinder (17), the first valve seat (18), the third valve cylinder (19), the second valve seat (20) and the fourth valve cylinder (21), and the lower end of the valve rod (16) is connected with the pressure regulating spring (22).
5. The bridge type concentric constant-flow water injection system according to claim 2, wherein: the lower end of the driving shaft (11) is sleeved with a protective cylinder (12).
6. A bridge type concentric constant-current water injection control method adopts the bridge type concentric constant-current water injection system of claim 4, and is characterized by comprising the following steps:
step 1) the integrated testing and adjusting instrument is electrically connected with a ground controller to test and adjust the constant-current water distributor, so that the layered flow reaches the injection allocation requirement, and constant-pressure water injection is carried out through a bridge type concentric constant-current water injection system;
and 2) in the water injection process, when the pressure of a ground water injection system fluctuates and a ground constant pressure control valve (24) of a ground constant pressure control system is not recovered in time, automatic adjustment is carried out through an overflowing constant pressure piece (14) and a constant flow mechanism, so that the layered flow is kept stable.
7. The bridge type concentric constant-current water injection control method according to claim 6, wherein the measuring and adjusting process in the step 1) is as follows:
the first step is as follows: the ground controller is connected with an integrated testing and adjusting instrument through a cable and is put into the water injection well, and a positioning claw and an adjusting claw of the integrated testing and adjusting instrument are respectively in positioning butt joint with a positioning shaft and a driving shaft (11) of the constant-current water distributor;
the second step is that: the ground controller controls the integrated test adjusting instrument to rotate to drive the driving shaft (11) to rotate, so that the movable water nozzle (10) and the fixed water nozzle (8) move relatively to each other, and the size of the water outlet is changed;
the third step: observing the change of the layered flow through a ground controller, and enabling the layered flow to meet the injection allocation requirement by continuously adjusting the size of a water outlet;
the fourth step: and (5) taking out the integrated instrument by testing and allocating personnel to carry out constant-pressure water injection.
8. The bridge type concentric constant-current water injection control method according to claim 6, characterized in that: in the water injection process, when the pressure of a ground water injection system rises, the internal pressure of the overflowing fixed pressing piece (14) rises, the valve rod (16) is pushed to move downwards, the balance is restored again under the action of the elastic force of the pressure regulating spring (22) and the overflowing fixed pressing piece (14), the gap between the valve rod (16) and the overflowing hole in the center of the second valve seat (20) is reduced, and the layered flow is kept stable.
9. The bridge type concentric constant-current water injection control method according to claim 6, characterized in that: in the water injection process, when the pressure of a ground water injection system is reduced, the internal pressure of the overflowing fixed pressing piece (14) is reduced, the valve rod (16) is pushed to move upwards, the balance is restored again under the action of the elastic force of the pressure regulating spring (22) and the overflowing fixed pressing piece (14), the gap between the valve rod (16) and the central overflowing hole of the second valve seat (20) is increased, and the layered flow is kept stable.
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Application publication date: 20210115 |