CN111594114A - Double-pipe digital layered water injection system and method - Google Patents
Double-pipe digital layered water injection system and method Download PDFInfo
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- CN111594114A CN111594114A CN202010423329.4A CN202010423329A CN111594114A CN 111594114 A CN111594114 A CN 111594114A CN 202010423329 A CN202010423329 A CN 202010423329A CN 111594114 A CN111594114 A CN 111594114A
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- 238000002347 injection Methods 0.000 title claims abstract description 160
- 239000007924 injection Substances 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 25
- 238000005253 cladding Methods 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 239000010410 layer Substances 0.000 claims description 75
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- 238000009826 distribution Methods 0.000 claims description 12
- 239000011152 fibreglass Substances 0.000 claims description 12
- 229920000271 Kevlar® Polymers 0.000 claims description 11
- 239000004761 kevlar Substances 0.000 claims description 11
- 239000011241 protective layer Substances 0.000 claims description 9
- 239000002033 PVDF binder Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 8
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 6
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 6
- 238000009941 weaving Methods 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
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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 double-pipe digital layering water injection system and a method, which comprises two water injection pipe columns which are arranged in a sleeve in parallel, wherein each water injection pipe column comprises a water injection pipe and a digital water distributor, the digital water distributor is connected with the lower end of the water injection pipe, a packer is arranged in the sleeve and used for isolating an upper oil layer and a lower oil layer of different layers, one water injection pipe column is introduced into the upper oil layer, and the other water injection pipe column is introduced into the lower oil layer after penetrating through the packer. The invention adopts two mutually independent water injection pipe columns to carry out digital zonal water injection on different layers simultaneously, thereby avoiding the problem that the stratum and the shaft are blocked due to scaling caused by incompatible fluids of different layers. Adopt the effect that nonmetal continuous cladding cable composite pipe is water injection passageway and control cable carrier, through pegging graft the cable on digital water injection mandrel, by its pressure and the flow of water injection of automatically controlled cabinet control to realize intelligent digital branch injection, compare in ordinary steel oil pipe branch injection technique, high-efficient intelligence and energy-concerving and environment-protective.
Description
Technical Field
The invention belongs to the technical field of oilfield water injection and oil extraction engineering, and particularly relates to a double-pipe digital stratified water injection system and a method.
Background
'air and oil in half basin' in Erdos basin, rich resources and multi-layer system superposition, such as oil fields in West region of south Liang, Ji tableland, and Huanjiang, etc., from top to bottom, develop dwara system and three-cascade system (mainly 2, 3, 4+5, 6 and 8, and part of regions also develop 7, 9 and 10).
At present, an oil layer is developed by one set of well patterns commonly used in oil fields, but due to incompatibility of the produced fluids of the dwarfism system and the triassic system, the water injection of a cage system is easy to scale, so that the formation and the shaft are blocked, the effects of water injection and oil extraction are influenced, and the production and operation cost of the oil well is increased.
Disclosure of Invention
The invention aims to provide a double-pipe digital layered water injection system, which overcomes the technical problems in the prior art.
The invention also aims to provide a double-pipe digital separate-layer water injection method which is suitable for water injection wells which develop and develop different layer series simultaneously and are not matched among layers in an oil field.
Therefore, the technical scheme provided by the invention is as follows:
the utility model provides a double-barrelled digital zonal injection water system, includes that two parallels locate the intraductal water injection tubular column of cover, the water injection tubular column includes water injection pipe and digital water injection mandrel, digital water injection mandrel is connected with the water injection pipe lower extreme, the intraductal packer that is equipped with of cover, the packer is used for keeping apart the last oil reservoir and the lower oil reservoir of different bed series, and a water injection tubular column lets in the oil reservoir, and another water injection tubular column lets in the lower oil reservoir after passing the packer.
The digital water distributor is electrically connected with a junction box on the ground and an electric control cabinet in the water distribution room through the cable, the electric control cabinet is used for sending an electric signal to the digital water distributor, and the digital water distributor is used for adjusting the opening degree of a water nozzle according to the electric signal.
The water injection pipe is a nonmetal continuous coating cable composite pipe, the nonmetal continuous coating cable composite pipe comprises an inner liner, a framework layer, a tensile layer and an outer protective layer which are sequentially arranged from inside to outside, and the tensile layer is coated with a cable.
And a pressure sensor and a flow sensor are arranged in the digital water distributor, and both the pressure sensor and the flow sensor are electrically connected with the electric control cabinet.
The cable includes power cable, detection pressure cable and detection flow cable, and three-strand cable all extends and the equipartition is in the cross section along the axial in the water injection pipe.
The framework layer is formed by weaving glass fiber reinforced plastics and Kevlar fiber, and the tensile layer is formed by weaving glass fiber reinforced plastics and Kevlar fiber.
The inner liner layer is made of polyethylene UHMWPE, and the outer protective layer is made of polyvinylidene fluoride PVDF.
A double-pipe digital stratified water injection method is characterized in that a double-pipe digital stratified water injection system is used, two water injection pipe columns are arranged in a shaft, one water injection pipe column is communicated with an upper oil layer, the other water injection pipe column is communicated with a lower oil layer, a packer is set at the position of a separation layer, and then the control cabinet is used for controlling the water injection amount of each water distributor according to the injection allocation requirement, so that the stratified water injection of the upper oil layer and the lower oil layer is realized.
In the water injection process, the pressure sensor and the flow sensor respectively measure pressure and flow, and send pressure signals and flow signals to the electric control cabinet, the electric control cabinet compares with set values, adjusts water pressure, and sends signals to the digital water distributor, and the digital water distributor adjusts the opening of a water nozzle according to the signals, so that the injection distribution quantity meets the injection distribution requirement.
The invention has the beneficial effects that:
according to the double-pipe digital stratified water injection system, two mutually independent water injection pipe columns are adopted to carry out digital stratified water injection on different strata simultaneously, and the problem that stratum and a shaft are blocked due to scaling caused by incompatibility of fluids of different strata is solved.
The invention adopts the nonmetal continuous coated cable composite tube as the continuous oil tube to play the roles of a water injection channel and a control cable carrier, and the intelligent digital separate injection is realized by inserting the cable on the digital water distributor and controlling the pressure and the flow of water injection by the electric control cabinet.
The adopted nonmetal continuous coating cable composite pipe is different from a common glass fiber reinforced plastic composite pipe in material and structure, and Kevlar (Kevlar) fiber and glass fiber reinforced plastic fiber are mixed for use, so that the nonmetal continuous coating cable composite pipe has the greatest advantages of enhancing toughness and strength, not influencing temperature resistance, being easy to process, being anticorrosive, convenient to operate and the like, and is very suitable for a digital split injection technology needing cable operation; in addition, different from the conventional cable which is bound outside the oil pipe, the nonmetal continuous coating cable composite pipe of the invention is characterized in that the preset cable is arranged in the continuous composite pipe, thereby improving the operation efficiency and reducing the operation intensity.
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 structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an embodiment of a composite tube of a non-metallic continuous clad cable;
figure 3 is a cross-sectional view of a tensile layer.
In the figure:
description of reference numerals:
1. an inner liner layer; 2. a framework layer; 3. a tensile layer; 4. an outer protective layer; 5. a power cable; 6. detecting a pressure cable; 7. detecting a flow cable; 8. a first digital water distributor; 9. a packer; 10. a second digital water distributor; 11. applying an oil layer; 12. discharging an oil layer; 13. an electric control cabinet; 14. a junction box; 15. a water injection well mouth; 16. continuously wrapping a first cable composite pipe by using a nonmetal; 17. and a second cable composite pipe is continuously coated by nonmetal.
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 double-pipe digitized stratified water injection system described in this 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 double-barrelled digital zonal injection system, locate the intraductal water injection tubular column of cover including two parallels, the water injection tubular column includes water injection pipe and digital water injection mandrel, digital water injection mandrel is connected with the water injection pipe lower extreme, the intraductal packer 9 that is equipped with of cover, packer 9 is used for keeping apart the last oil reservoir 11 and the lower oil reservoir 12 of different layers system, and a water injection tubular column lets in oil reservoir 11, and another water injection tubular column lets in oil reservoir 12 down after passing packer 9.
The double-pipe digital stratified water injection system provided by the invention is suitable for water injection wells which develop and develop different stratum systems at the same time and are not compatible among layers in oil fields. The two mutually independent water injection pipe columns are adopted to carry out digital zonal water injection on different layer systems simultaneously, so that the problem that fluids of different layer systems are incompatible to cause scaling, thereby blocking strata and a shaft is avoided, and the intelligent environmental protection is realized.
Example 2:
based on example 1, this example further illustrates the present invention using the deldos basin as an example. The dwarass system and the triassic system are developed in the Erdos basin at the same time, and because the dwarass system and the triassic system are incompatible with each other, the water injection of the system is easy to scale, thereby causing the blockage of strata and mineshafts, influencing the effects of water injection and oil extraction and increasing the production and operation cost of oil wells.
As shown in figure 1, the dwarfism and the triassic system respectively correspond to an upper oil layer 11 and a lower oil layer 12, the corresponding water injection pipe columns are a water injection pipe column I and a water injection pipe column II, and the water injection well mouth 15 parts are also independently separated. The first water injection pipe column comprises a first nonmetal continuous coating cable composite pipe 16 and a first digital water distributor 8, and the second water injection pipe column comprises a second nonmetal continuous coating cable composite pipe 17 and a second digital water distributor 10. The first water injection pipe column and the second water injection pipe column are arranged in the sleeve in parallel, a pair of upper oil layers 11 of the water injection pipe columns are used for injecting water, a pair of lower oil layers 12 of the water injection pipe columns are used for injecting water, electric power is transmitted to the first underground digital water distributor 8 and the second underground digital water distributor 10 through cables, and intelligent and digital separate injection is achieved by controlling the opening pressure and the water distribution amount of the water distributors.
Example 3:
the embodiment provides a double-barrelled digital zonal injection system, locate the intraductal water injection tubular column of cover including two parallels, the water injection tubular column includes water injection pipe and digital water injection mandrel, digital water injection mandrel is connected with the water injection pipe lower extreme, the intraductal packer 9 that is equipped with of cover, packer 9 is used for keeping apart the last oil reservoir 11 and the lower oil reservoir 12 of different layers system, and a water injection tubular column lets in oil reservoir 11, and another water injection tubular column lets in oil reservoir 12 down after passing packer 9.
The digital water distributor is electrically connected with a junction box 14 on the ground and an electric control cabinet 13 in the water distribution room through cables, the electric control cabinet 13 is used for sending electric signals to the digital water distributor, and the digital water distributor is used for adjusting the opening degree of a water nozzle according to the electric signals.
With the cable cladding in the water injection pipe, can reduce the size of water injection pipe on the one hand, realize that two water injection tubular columns exist in the pit shaft simultaneously, on the other hand cable receives the protection of tubular product, and the in-process cable of going up the operation of going into the well can not scrape with the inside pipe wall, collide with and damage, has avoided the wearing and tearing of oil pipe's vibration to the cable, therefore cable and tubular product have equal life.
The invention uses two independent nonmetal continuous cladding cable composite pipes to respectively mine two layer systems, and the control cable is embedded in the water injection pipe and is used for controlling the water injection quantity of the digital water distributor, thereby improving the development effect of the oil reservoir, and being intelligent (labor-saving), energy-saving and environment-friendly.
Example 4:
on the basis of embodiment 1, this embodiment provides a double-barrelled digital layering water injection system, the water injection pipe is nonmetal compound pipe of continuous cladding cable, nonmetal compound pipe of continuous cladding cable includes inside liner 1, casing layer 2, tensile layer 3 and the outer protective layer 4 that sets gradually from inside to outside, 3 claddings in tensile layer have the cable.
As shown in fig. 2, the nonmetal continuous coated cable composite pipe adopts four layers of composite materials, namely an inner liner layer 1, a framework layer 2, a tensile layer 3 and an outer protection layer 4 from inside to outside.
As shown in fig. 3, the cable preform is wrapped around the tensile layer 3. Nonmetal continuous cladding cable composite pipe plays the water injection passageway and plays the effect as control cable carrier as coiled tubing, through pegging graft the cable on digital water injection mandrel, by automatically controlled cabinet 13 control its pressure and the flow of water injection to realize intelligent digital branch injection, compare in ordinary steel oil pipe branch injection technique, high-efficient intelligence and energy-concerving and environment-protective more.
Different from the conventional cable which is bound outside the oil pipe, the nonmetal continuous coating cable composite pipe of the invention is characterized in that the preset cable is arranged in the continuous composite pipe, thereby improving the operation efficiency and reducing the operation intensity.
Example 5:
on the basis of embodiment 3, the embodiment provides a double-pipe digital layered water injection system, a pressure sensor and a flow sensor are arranged in the digital water distributor, and both the pressure sensor and the flow sensor are electrically connected with the electric control cabinet 13.
In the water injection process, the pressure sensor and the flow sensor respectively measure pressure and flow, and send pressure signals and flow signals to the electric control cabinet 13, the electric control cabinet 13 compares with set values, adjusts water pressure, and sends signals to the digital water distributor, and the digital water distributor adjusts the opening of the water nozzle according to the signals.
Example 6:
the embodiment provides a double-barrelled digital zonal injection system, locate the intraductal water injection tubular column of cover including two parallels, the water injection tubular column includes water injection pipe and digital water injection mandrel, digital water injection mandrel is connected with the water injection pipe lower extreme, the intraductal packer 9 that is equipped with of cover, packer 9 is used for keeping apart the last oil reservoir 11 and the lower oil reservoir 12 of different layers system, and a water injection tubular column lets in oil reservoir 11, and another water injection tubular column lets in oil reservoir 12 down after passing packer 9.
The digital water distributor is electrically connected with a junction box 14 on the ground and an electric control cabinet 13 in the water distribution room through cables, the electric control cabinet 13 is used for sending electric signals to the digital water distributor, and the digital water distributor is used for adjusting the opening degree of a water nozzle according to the electric signals.
The cable includes power cable 5, detection pressure cable 6 and detection flow cable 7, and three-strand cable all extends and the equipartition is in the cross section along the axial in the water injection pipe.
The digital water distributor sends a pressure signal and a flow signal to the electric control cabinet 13 through the pressure detection cable 6 and the flow detection cable 7 respectively, the electric control cabinet 13 adjusts the water pressure after being compared with a set value, and sends a signal to the digital water distributor, and the digital water distributor adjusts the opening of the water nozzle according to the signal.
Example 7:
on the basis of embodiment 4, the embodiment provides a double-pipe digital stratified water injection system, the framework layer 2 is formed by weaving glass fiber reinforced plastic fibers and Kevlar fibers, and the tensile layer 3 is formed by weaving glass fiber reinforced plastic fibers and Kevlar fibers.
The inner liner layer 1 is made of polyethylene UHMWPE, and the outer protective layer 4 is made of polyvinylidene fluoride PVDF.
The nonmetal continuous coating cable composite pipe adopts glass fiber reinforced plastic and Kevlar fiber. The framework layer 2 and the tensile layer 3 mainly adopt glass fiber reinforced plastics and Kevlar fibers; the two fibers are mixed and woven to be spirally arranged, and are used as a framework layer 2 after being impregnated with resin and cured to bear internal pressure and external extrusion force; the two fibers are woven in a mixed mode and arranged along the axial direction to form the tensile layer 3, the tensile layer 3 bears the axial tensile stress, and the cable extending along the axial direction is prefabricated and coated on the tensile layer 3.
The inner liner layer 1 and the outer protective layer 4 are made of high polymer materials (plastics): the lining layer 1 is made of ultra-high molecular weight polyethylene UHMWPE, the molecular weight of the UHMWPE exceeds 150 ten thousand, the friction coefficient is 0.1-0.22, the friction factor (self-lubricity) is 0.05-0.11, the surface roughness is 8.48 mu m, and the impact strength is 220kJ/m2The relative density is 0.94, the temperature resistance can reach 95 ℃, the paint is not corroded in alkali liquor and acid liquor, and the paint has the comprehensive properties of wear resistance, impact resistance, self lubrication, corrosion resistance, impact energy absorption, small density, difficult water absorption, sanitation, no toxicity and the like which are incomparable with common plastics; the outer protective layer 4 adopts polyvinylidene fluoride PVDF, and has the functions of corrosion resistance, wear resistance, external leakage resistance and pipe protection.
The nonmetal continuous composite pipe is different from a common glass fiber reinforced plastic composite pipe in material and structure, and the Kevlar fiber and the glass fiber reinforced plastic fiber are mixed for use, so that the nonmetal continuous composite pipe has the greatest advantages of enhancing toughness and strength, not influencing the temperature resistance, along with easy processing, corrosion resistance, convenient operation and the like, and is very suitable for a digital split injection technology needing cable operation; in addition, different from the conventional cable which is bound outside the oil pipe, the nonmetal continuous coating cable composite pipe of the invention is characterized in that the preset cable is arranged in the continuous composite pipe, thereby improving the operation efficiency and reducing the operation intensity.
The nonmetal continuous coating cable composite oil pipe has the maximum outer diameter reaching 89mm, can meet the requirement of 3000m well depth, has the internal pressure resistance of 40MPa, the tensile strength of 400KN and the minimum bending radius of 0.9m, and is suitable for the temperature range of minus 20-95 ℃.
Example 8:
the invention provides a double-pipe digital stratified water injection method, which comprises the steps of using the double-pipe digital stratified water injection system in the embodiment 5, putting two water injection pipe columns into a shaft, leading one water injection pipe column into an upper oil layer 11 and the other water injection pipe column into a lower oil layer 12, setting a packer 9 at the position of a separation layer, and controlling the water injection amount of each water distributor through a control cabinet according to the injection distribution requirement to realize the stratified water injection of the upper oil layer 11 and the lower oil layer 12.
In the water injection process, the pressure sensor and the flow sensor respectively measure pressure and flow, and send pressure signals and flow signals to the electric control cabinet 13, the electric control cabinet 13 adjusts water pressure after comparing with a set value, and sends signals to the digital water distributor, and the digital water distributor adjusts the opening of a water nozzle according to the signals, so that the injection distribution quantity meets the injection distribution requirement.
In conclusion, the double-pipe digital stratified water injection system provided by the invention adopts two mutually independent water injection pipe columns to carry out digital stratified water injection on different layers simultaneously, so that the problem that the stratum and a shaft are blocked due to scaling caused by incompatible fluids of different layers is solved.
The invention adopts the nonmetal continuous coated cable composite tube as the continuous oil tube to play the roles of a water injection channel and a control cable carrier, and the intelligent digital separate injection is realized by inserting the cable on the digital water distributor and controlling the pressure and the flow of water injection by the electric control cabinet 13.
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.
Claims (9)
1. The utility model provides a double-barrelled digital layering water injection system which characterized in that: the water injection pipe column comprises two water injection pipe columns which are arranged in a sleeve in parallel, each water injection pipe column comprises a water injection pipe and a digital water distributor, the digital water distributor is connected with the lower end of the water injection pipe, a packer (9) is arranged in the sleeve, the packer (9) is used for isolating an upper oil layer (11) and a lower oil layer (12) of different layers, one water injection pipe column is introduced into the upper oil layer (11), and the other water injection pipe column is introduced into the lower oil layer (12) after penetrating through the packer (9).
2. The double-pipe digital stratified water injection system according to claim 1, wherein: the digital water distributor is electrically connected with a junction box (14) on the ground and an electric control cabinet (13) in the water distribution room through the cable, the electric control cabinet (13) is used for sending an electric signal to the digital water distributor, and the digital water distributor is used for adjusting the opening degree of a water nozzle according to the electric signal.
3. The double-pipe digital stratified water injection system according to claim 1, wherein: the water injection pipe is nonmetal continuous cladding cable composite pipe, nonmetal continuous cladding cable composite pipe includes inner liner (1), casing ply (2), tensile layer (3) and outer protective layer (4) that set gradually from inside to outside, tensile layer (3) cladding has the cable.
4. The double-pipe digital stratified water injection system according to claim 2, wherein: and a pressure sensor and a flow sensor are arranged in the digital water distributor, and are electrically connected with the electric control cabinet (13).
5. A double pipe digitized stratified water injection system according to claim 2 or 3, wherein: the cable includes power cable (5), detection pressure cable (6) and detection flow cable (7), and three-strand cable all extends axial extension and equipartition in the cross section in the water injection pipe.
6. The double-pipe digital stratified water injection system according to claim 3, wherein: the framework layer (2) is formed by weaving glass fiber reinforced plastics and Kevlar fibers, and the tensile layer (3) is formed by weaving glass fiber reinforced plastics and Kevlar fibers.
7. The double-pipe digital stratified water injection system according to claim 3, wherein: the inner liner layer (1) is made of polyethylene UHMWPE, and the outer protective layer (4) is made of polyvinylidene fluoride PVDF.
8. A double-pipe digitized stratified water injection method using the double-pipe digitized stratified water injection system according to claim 4, characterized in that: two water injection pipe columns are arranged in the shaft, one water injection pipe column is communicated with an upper oil layer (11), the other water injection pipe column is communicated with a lower oil layer (12), the packer (9) is sealed at the position of the interlayer, and then the control cabinet controls the water injection amount of each water distributor according to the injection allocation requirement, so that the separate-layer water injection of the upper oil layer (11) and the lower oil layer (12) is realized.
9. The double-pipe digital stratified water injection method according to claim 8, wherein: in the water injection process, the pressure sensor and the flow sensor respectively measure pressure and flow, and send pressure signals and flow signals to the electric control cabinet (13), the electric control cabinet (13) compares with set values, then adjusts water pressure, and sends signals to the digital water distributor, and the digital water distributor adjusts the opening of a water tap according to the signals, so that the injection distribution amount meets the injection distribution requirement.
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