CN112211604B - Be used for big pressure differential self-adaptation injection mandrel in oil well - Google Patents
Be used for big pressure differential self-adaptation injection mandrel in oil well Download PDFInfo
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- CN112211604B CN112211604B CN202011070846.4A CN202011070846A CN112211604B CN 112211604 B CN112211604 B CN 112211604B CN 202011070846 A CN202011070846 A CN 202011070846A CN 112211604 B CN112211604 B CN 112211604B
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- 238000002347 injection Methods 0.000 title claims abstract description 30
- 239000007924 injection Substances 0.000 title claims abstract description 30
- 239000003129 oil well Substances 0.000 title description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 144
- 230000000903 blocking effect Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 11
- 239000003208 petroleum Substances 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims description 2
- 230000035772 mutation Effects 0.000 claims description 2
- 230000010412 perfusion Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Nozzles (AREA)
Abstract
The invention provides a core self-adaptive pressure stabilizing structure of a petroleum underground large-pressure-difference self-adaptive water distributor, which belongs to the technical field of water distributors and comprises a self-adaptive pressure stabilizing structure and a cross-shaped water nozzle, in particular to a water injection well layered water injection device in the petroleum exploitation process, wherein the self-adaptive pressure stabilizing structure comprises a spring, a throttling main body, a retaining cap and a sealing element, the inner cavity of the retaining cap is connected with the throttling main body through the spring, the retaining cap is subjected to water pressure and moves in a certain range, one end of the retaining cap is provided with a water inlet, and the other end of the retaining cap is connected with the throttling main body through the sealing element; the cross-shaped water nozzle can balance the water outlet pressure of the water outlet, prevent the situation of over-high local pressure and improve the stability during perfusion; the invention offsets a part of water pressure by extruding the blocking cap by high pressure water and the spring, thereby solving the problems of unstable filling pressure, unbalanced water outlet pressure of the water nozzle and the like caused by the pressure change of the main channel in the water injection process of the oil underground water distributor.
Description
Technical Field
The application relates to a water injection well separated layer water injection device in the process of oil exploitation, in particular to a large pressure difference self-adaptive water distributor core used in an oil well.
Background
In order to meet the requirements of a separate-layer production allocation process, a multipurpose production allocation control system of the oil well is developed, so that a production allocation layer can reach 7~8, the series problems that the number of stages of tubular column separators is too large, oil nozzles can be randomly adjusted without moving tubular columns, layered testing can be performed, no plugging is caused, tubular columns are lifted and lowered without killing a well and the like are solved, and the requirements of oil layer development are met.
According to the research of relevant documents, relevant scholars at home and abroad carry out a series of theoretical researches and experiments on the water distributor core, and the intelligent chip is mainly combined to control the stratum perfusion flow. The division of the production allocation layer is divided within a certain stratum pressure range, but the stratum condition is complex, and the injection of the production allocation layer needs to be accurately controlled, so that the injection by the water pressure with a fixed value pressure obviously cannot meet the actual requirement, the water injection process needs to be adjusted in real time by combining the actual stratum condition, the stability problem of water injection cannot be guaranteed, and the structure optimization of parts such as a throttling main body structure and a water nozzle in the water distributor is needed.
The water distributor is one of core parts for water injection development in oil layer. In the middle and later stages of oil exploitation, water is injected into the stratum to improve the oil recovery ratio, wherein the water injection well is divided into a plurality of layers, the water injection amount of different strata needs to be accurately controlled, the water injection process needs to be stable, the water injection into the stratum can not only provide energy for the oil layer and guarantee the oil production speed, but also participate in the processes of material exchange and material movement in the oil reservoir system. Stability during water injection is one of the important influencing factors for effectively improving water injection efficiency and oil recovery rate.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a self-adaptive pressure stabilizing structure and a cross-shaped water nozzle for a petroleum underground large-pressure-difference self-adaptive water distributor core, which are reasonable in design, overcome the defects of the prior art and have good effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
a self-adaptive pressure stabilizing structure for a large-pressure-difference water distributor core in an oil well comprises a throttling main body b, a blocking cap, a sealing piece and a spring, wherein the spring is arranged in the inner cavity of the throttling main body b and the inner cavity of the blocking cap, and the throttling main body b and the blocking cap can compress the spring to generate relative movement; a spring is nested at one end of the throttling main body b and is installed with the stop cap, and the inner wall of the other end of the throttling main body b is provided with threads and is connected with the upper joint;
a stop cap of a self-adaptive pressure stabilizing structure for a core of a large-pressure-difference water distributor in an oil well is of a cylindrical structure, the diameters of circles of two end faces are different, the middle of the stop cap is in transition through a round angle, through holes in geometric shapes are formed in the outer wall of the stop cap, the through holes are uniformly distributed according to the pipe wall, the number of the through holes is selected according to actual needs, a sealing element is arranged on the outer side of a throttling main body b and the outer side of the stop cap, and a spring is embedded in the sealing element;
a cross-shaped water nozzle for a large-pressure-difference self-adaptive water distributor core is arranged on a through hole in the pipe wall of a throttling main body b, the water nozzle is cylindrical, a circular through hole is formed in the middle of the water nozzle, the upper surface of the water nozzle is of an arch structure, a cross-shaped water outlet groove is formed in the position of a water outlet of the upper surface, and the bottom of the water outlet groove is a semicircular bottom.
The working principle is as follows:
the invention relates to a self-adaptive pressure stabilizing structure for a large-pressure-difference self-adaptive water distributor core in a petroleum well and a cross-shaped water nozzle. Under normal conditions, the water paths are as follows:
1) Water enters from the main channel, enters into the primary annular channel through the cross-shaped water nozzle of the main channel, and then enters into the secondary annular channel through the geometric hole on the blocking cap;
2) And after the water flow reaches the secondary annular channel, the water flow is sprayed out through the cross-shaped water nozzle on the throttling main body b to enter the stratum where the water flow is located, so that the water injection process is completed.
When the water injection pressure of the main channel fluctuates, the water injection pressure exceeds a threshold value, and the water paths are as follows:
1) Water enters the primary annular channel from the cross-shaped water nozzle of the main channel, and because the pressure of the water flow extruding the blocking cap is greater than the elastic force of the spring, the water flow pushes the blocking cap to extrude the spring to offset certain water pressure fluctuation, a water channel is generated between the blocking cap and the throttling main body a, and the water flow enters the water channel of the secondary annular channel to be expanded;
2) And after the water flow reaches the secondary annular channel, the water flow is sprayed out through the cross-shaped water nozzle on the throttling main body b to fill the stratum, so that the water injection process is completed.
The invention has the following beneficial technical effects:
the invention adopts a self-adaptive pressure stabilizing structure for a petroleum underground large-pressure-difference self-adaptive water distributor core, and mainly aims to prevent the problems of unstable formation injection pressure and the like caused by water pressure fluctuation in the injection process; when the pressure of the poured water flow entering the primary annular channel is too large, certain water injection pressure can be offset through the extrusion spring, so that when the water flow enters the secondary annular channel, the pressure fluctuates in a certain range, and the effect of self-adaption pressure stabilization is finally achieved.
The cross-shaped water nozzle adopted by the invention can balance the pressure distribution of the water nozzle in the water outlet process and can also reduce the influence of high pressure on the core water nozzle of the water distributor during the pouring. The pressure of the water outlet is stable and balanced in the process of pouring, the problem that stratum pouring is affected due to pressure mutation and the like is solved, and the stability of water injection is improved.
Drawings
FIG. 1 is a half cross-sectional view of an adaptive water distributor core;
FIG. 2 is a cross-shaped water nozzle of a core of the self-adaptive water distributor;
FIG. 3 is a diagram of a core cap of the adaptive water distributor;
FIG. 4 is a partial cross-sectional view of an adaptive pressure stabilization structure;
wherein, in the attached figure 1: 1-upper joint; 2-a seal; 3, pressing a ring; 4-throttle body b; 5-a secondary annular channel water outlet; 6-a spring; 7-blocking cap; 8-a first-stage annular channel water outlet; 9-throttle body a; 10-lower joint.
Detailed Description
1. Core pressure stabilizing process of self-adaptive water distributor
As shown in the attached figure 1, the self-adaptive water distributor core mainly comprises an upper joint, a throttling main body b, a blocking cap, a sealing element, a throttling main body a, a pressing ring, a spring and a lower joint; aiming at the existing water distributor core structure, a blocking cap, a water nozzle, a throttling main body and the like are improved, and a self-adaptive pressure stabilizing structure is introduced; water flow enters the primary annular channel from the main channel of the pipeline through the water nozzle on the throttling main body a, when the water flow pressure of the main channel in the pipeline is stable, the water flow can enter the secondary annular channel from the geometric through hole of the blocking cap according to the set pressure, and the water flow is sprayed out through the water nozzle on the throttling main body b; however, when the water flow pressure in the pipeline channel changes, for example, the required filling pressure is reached at the initial filling stage, the water flow pressure of the main channel needs to be adjusted dynamically to a certain extent, a spring is arranged between the blocking cap and the throttling main body b, and the water flow pressure of the water distributor core is not enough to push the blocking cap to move during normal filling; when the water flow pressure of the main channel is too high, the high-pressure water flow entering the primary annular channel can push the blocking cap to move, and the compression spring offsets a part of the water flow pressure, so that the water flow pressure flowing out of the secondary annular channel water nozzle is not too high, the spring is arranged in the middle of the sealing element, and the blocking cap and the throttling main body b can be always kept in a sealing state when the blocking cap moves.
2. Core cross water nozzle of self-adaptive water distributor
As shown in the attached figure 2, when the water nozzle sprays water, the water nozzle firstly passes through the cross-shaped water tank, the cross-shaped water tank is filled with the water, then the water is sprayed out to the stratum through the water tank, and the water column sprayed out by the water nozzle is in a cross shape at the moment, so that the high pressure when the water directly flows out from the channel is relieved, and the stability of pouring is improved; the bottom of the water tank is semicircular, so that the stress concentration phenomenon can be effectively prevented, and the water pressure enables the water nozzle to receive uniform pressure through the cross shape, so that the service life of the water nozzle is prolonged.
Claims (2)
1. The utility model provides a be used for big pressure differential self-adaptation injection mandrel in oil pit which characterized in that: the self-adaptive pressure stabilizing structure comprises a throttling main body a, a throttling main body b, a blocking cap, a spring a, a spring b and a sealing element, wherein a water inlet with a regular geometric shape is formed in one end of the blocking cap, the other end of the blocking cap is connected with the sealing element on the throttling main body b, the spring a is installed on the outermost side of one end of the throttling main body b and is connected with an inner cavity of the blocking cap, and the blocking cap and the throttling main body b can move relatively under the action of water pressure greater than a set threshold value, so that the flow input to a secondary annular passage is increased; the outer side of one end of the blocking cap without the water inlet is connected with a sealing element, the sealing element is connected with a throttling main body b, and a spring b is arranged in the middle of the sealing element, so that the blocking cap and the throttling main body b are always kept in a sealing state; the water outlet groove of the cross-shaped water nozzle is in a cross shape, the outer contour of the cross-shaped water nozzle is a thread, the cross-shaped water nozzle is installed on a throttling main body a and a throttling main body b of a water distributor core, the upper surface of a water outlet of the cross-shaped water nozzle is of an arch structure, pressure distribution of the water nozzle in the water outlet process can be balanced by the cross-shaped water nozzle, the influence of high pressure on the water nozzle during water injection can be reduced, stable and balanced water outlet pressure is realized in the water injection process, pressure mutation cannot be generated, and water injection stability is improved.
2. The core of the self-adaptive water distributor for the large pressure difference under the petroleum well as in the claim 1 is characterized in that the water inlets of the blocking cap are arranged in a semicircular shape or a rectangular shape, and the number of the water inlets is adjusted according to the engineering requirement and is uniformly distributed in one circle of the blocking cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070846.4A CN112211604B (en) | 2020-10-09 | 2020-10-09 | Be used for big pressure differential self-adaptation injection mandrel in oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070846.4A CN112211604B (en) | 2020-10-09 | 2020-10-09 | Be used for big pressure differential self-adaptation injection mandrel in oil well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112211604A CN112211604A (en) | 2021-01-12 |
| CN112211604B true CN112211604B (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011070846.4A Active CN112211604B (en) | 2020-10-09 | 2020-10-09 | Be used for big pressure differential self-adaptation injection mandrel in oil well |
Country Status (1)
| Country | Link |
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| CN (1) | CN112211604B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4858644A (en) * | 1988-05-31 | 1989-08-22 | Otis Engineering Corporation | Fluid flow regulator |
| CN202628052U (en) * | 2012-06-05 | 2012-12-26 | 中国石油化工股份有限公司 | Differential-pressure decomposition throttling water distributor |
| CN104165043B (en) * | 2013-05-17 | 2016-08-17 | 中国石油化工股份有限公司 | Two-tube constant current divides water controller |
| CN104563983B (en) * | 2013-10-10 | 2017-02-15 | 中国石油化工股份有限公司 | High-pressure-difference real-time adjusting water distributor |
| CN210118120U (en) * | 2019-05-24 | 2020-02-28 | 中国石油化工股份有限公司 | Multistage decompression eccentric water distributor and working barrel assembly thereof |
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2020
- 2020-10-09 CN CN202011070846.4A patent/CN112211604B/en active Active
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| CN112211604A (en) | 2021-01-12 |
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