CN-121993127-A - Guide and injection integrated structure, electric field enhanced oil recovery method and deployment well pattern

CN121993127ACN 121993127 ACN121993127 ACN 121993127ACN-121993127-A

Abstract

The invention relates to a guide and injection integrated structure, an electric field enhanced oil recovery method and a deployment well pattern. The electrode device at least comprises an electrode arranged in the shell, a water injection pipe penetrating into the shell, and a water injection hole arranged on the pipe wall of the water injection pipe and facing the injection point. The integrated structure of guide injection can realize that the underground electrode is conductive and water injection is carried out simultaneously, electrochemical effect and Joule heat are applied to an underground oil reservoir, and by establishing a stratum direct current electric field, the influence is exerted on rock medium of saturated fluid, so that the electrochemical effect is generated in the stratum, and meanwhile, the direct current electric field can generate coulomb force and electric field force far greater than pressure difference force in a near-wellbore zone, so that effects such as electroosmosis, electrowetting, joule heat and electromigration are generated in the stratum, and the purposes of improving physical properties of the oil reservoir, changing fluid properties and improving oil reservoir recovery ratio are achieved.

Inventors

DONG HONG
MA HAOXING
WEI PU
WANG QIAN
Tao Xianxian
ZHANG XINQI
LI ZHE
LIU RUI
XU XI
XU HAIPENG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. Guide annotates integrated structure, is suitable for electric field enhanced oil recovery, its characterized in that includes: A housing (10) having a wall provided with apertures for the injection points (101) of the water supply into the desired reservoir (200); An electrode device (20) comprising at least an electrode (201) arranged within the housing (10); The water injection pipe (30) penetrates into the shell (10), a water injection hole (301) is formed in the pipe wall of the water injection pipe (30), the water injection hole (301) is opposite to the injection point (101), and the electrode (201) is in soaking contact with water flow from the water injection hole (301).
2. The infusion integrated structure according to claim 1, characterized in that said casing (10) is of hollow cylindrical structure; The hollow columnar structure has two open ends, one of which is closed by an electrode plate (202); the water injection pipe (30) penetrates through the electrode plate (202) and then stretches into the shell (10).
3. The infusion integrated structure according to claim 2, characterized in that said electrode means (20) comprise: an electrode (201) the length of which covers the injection point (101); An electrode plate (202) closing an open end of the housing (10), a cable connector (203) being mounted on the electrode plate (202) to enable a cable (300) to supply power to the electrode (201).
4. The integrated structure of guide injection according to claim 2, characterized in that a first partition plate (102) is further provided in the housing (10), and the first partition plate (102) is close to the electrode plate (202); the electrode (201) and the water injection pipe (30) penetrate through the first separation plate (102); The first partition plate (102) is of a circular ring structure, an outer ring of the first partition plate is tightly attached to the inner wall of the shell (10), an inner ring of the first partition plate is tightly attached to the electrode (201), and a hole for the water injection pipe (30) to penetrate is tightly attached to the water injection pipe (30).
5. The integrated structure of guiding and injecting as claimed in claim 4, wherein when the injection point (101) is one, a tail end nozzle of the water injection pipe (30) is used as the water injection hole (301).
6. The integrated structure of guiding and injecting according to claim 4, wherein when the number of the injection points (101) is at least two, the tail end pipe orifice of the water injection pipe (30) is used as the lowest water injection hole (301), and the rest water injection holes (301) are sequentially opened in the water injection pipe (30) along the axial direction; a second partition plate (103) is arranged between two adjacent water injection holes (301); The second partition plate (103) is of a circular ring structure, an outer ring of the second partition plate is tightly attached to the inner wall of the shell (10), an inner ring of the second partition plate is tightly attached to the electrode (201), and a hole for the water injection pipe (30) to penetrate is tightly attached to the water injection pipe (30).
7. The infusion integrated structure according to claim 6, characterized in that said infusion points (101) are three.
8. The infusion integrated structure according to claim 2, characterized in that said electrode (201) is of cylindrical structure; the electrode (201) is a hollow electrode or a solid electrode.
9. The electric field enhanced oil recovery deployment well pattern is characterized by comprising an anode well (400), an oil recovery well (500) and a cathode well (600); the well mouth connecting lines of the three wells are straight lines, and the oil extraction well (500) is positioned between the other two wells; the guiding and injecting integrated structure of any one of claims 1-8 is arranged in each of the anode well (400) and the cathode well (600).
10. The electric field enhanced oil recovery method is characterized by comprising the following steps of: the electric field enhanced oil recovery deployment pattern of claim 9, deploying all production wells (500); A sucker rod (51) is put into the oil extraction well (500), and an oil extraction pump (52) is arranged at the tail part of the sucker rod (51); The guide and injection integrated structure is connected with the cable (300) through the cable connector (203); the cable (300) is not electrified, water is injected into the cathode well (600) through the water injection pipe (30), the oil extraction well (500) starts production, and water injection is stopped after the water is injected into the preset water quantity; The cable (300) positioned in the anode well (400) is connected with a direct current anode, the cable (300) positioned in the cathode well (600) is connected with a direct current cathode, the cable (300) is electrified, and the oil recovery well (500) is continuously produced; And when the liquid yield of the oil recovery well (500) is reduced and the output currents of the anode well (400) and the cathode well (600) are continuously reduced, stopping electrifying, injecting water into the cathode well (600), stopping injecting water after the water is injected into the preset water amount, starting electrifying, and continuously producing the oil recovery well (500).

Description

Guide and injection integrated structure, electric field enhanced oil recovery method and deployment well pattern Technical Field The invention belongs to the field of petroleum exploitation, and particularly relates to a guide and injection integrated structure, an electric field enhanced oil recovery method and a deployment well pattern. Background Because the electric field enhanced oil recovery has the functions of dredging an oil layer, strengthening oil flow and increasing water injection capacity, the electric field enhanced oil recovery technology is mainly oriented to two types of oil reservoirs, namely a high-water-content oil reservoir and a heavy oil reservoir, and aims to improve the crude oil recovery rate of the two types of oil reservoirs. The electric field enhanced oil recovery technology utilizes the poor electrical property of rock, oil and water to exert an action on a saturated fluid rock medium, so that electrochemical effect is generated in stratum and ohmic heat is generated, thereby changing fluid viscosity, improving oil-water seepage rule and improving oil field recovery ratio. However, the existing electric field enhanced oil recovery technology adopts the same well as an electrode well and a production well, and cannot realize simultaneous operation of power on and oil recovery. Disclosure of Invention The invention aims to provide a guide and injection integrated structure, an electric field enhanced oil recovery method and a deployment well pattern, so as to overcome the technical defects. In order to solve the technical problems, the invention provides a guiding and injecting integrated structure, which is suitable for electric field enhanced oil recovery and comprises the following components: the shell is provided with holes on the wall to be used as injection points for water to flow into a target oil layer; An electrode device at least comprising an electrode, arranged in the housing; The water injection pipe penetrates into the shell, a water injection hole is formed in the pipe wall of the water injection pipe, the water injection hole is opposite to the injection point, and the electrode is soaked and contacted with water flow from the water injection hole. According to the guide and injection integrated structure, the shell is of a hollow columnar structure; the hollow columnar structure is provided with two open ends, and one open end is closed by the electrode plate; the water injection pipe penetrates through the electrode plate and then stretches into the shell. According to the infusion integrated structure, the electrode device includes: An electrode having a length covering the injection point; and the electrode plate is used for blocking one opening end of the shell, and a cable connector is arranged on the electrode plate so that a cable can supply power to the electrode. According to the guide and injection integrated structure, a first partition plate is further arranged in the shell, and the first partition plate is close to the electrode plate; The electrode and the water injection pipe penetrate through the first separation plate; The first partition plate is of a circular ring structure, an outer ring of the first partition plate is tightly attached to the inner wall of the shell, an inner ring of the first partition plate is tightly attached to the electrode, and a hole for the water injection pipe to penetrate is tightly attached to the water injection pipe. According to the guide and injection integrated structure, when the injection point is one, the pipe orifice at the tail end of the water injection pipe is used as the water injection hole. According to the guide and injection integrated structure, when the number of injection points is at least two, the tail end pipe orifice of the water injection pipe is used as the lowest water injection hole, and the rest water injection holes are sequentially arranged on the water injection pipe along the axial direction; a second partition plate is arranged between two adjacent water injection holes; The second partition plate is of a circular ring structure, an outer ring of the second partition plate is tightly attached to the inner wall of the shell, an inner ring of the second partition plate is tightly attached to the electrode, and a hole for the water injection pipe to penetrate is tightly attached to the water injection pipe. According to the guide and injection integrated structure, the number of injection points is three. According to the guide and injection integrated structure, the electrode is of a columnar structure; the electrode is a hollow electrode or a solid electrode. The invention also provides an electric field enhanced oil recovery deployment well pattern, which comprises an anode well, a production well and a cathode well; The well mouth connecting line of the three wells is a straight line, and the oil extraction well is positioned between the other two wells; and guide and injectio