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Method and system for improving recovery yield of water channeling layer

A recovery factor and water channeling technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve problems such as effective plugging of unfavorable water channeling layers, inability to exert plugging control and flooding, and insufficient effect. To achieve the effect of small flow resistance, large flow resistance and lower fluidity ratio

Inactive Publication Date: 2019-02-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practical application results show that: CO 2 Although it can expand the heavy oil and reduce its viscosity, thereby increasing the oil production of a single well to a certain extent, it cannot play the role of plugging and regulating and flooding, and CO2 is prone to occur. 2 Gas channeling, the effect is not obvious enough
In addition, conventional CO 2 The seepage resistance of the emulsion in the formation is very large, which is also not conducive to the realization of depth profile control and effective plugging of water channeling layers

Method used

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  • Method and system for improving recovery yield of water channeling layer
  • Method and system for improving recovery yield of water channeling layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put the tight oil core in the core holder, inject saturated water first, and then inject saturated oil to obtain a simulated water channeling reservoir; the temperature of the simulated water channeling reservoir is 85°C, and the experimental pressure is 60MPa.

[0034] At a temperature of 60°C and an absolute pressure of 10 MPa, the supercritical CO 2 , polyoxyethylene lauryl polyoxypropylene ether (C 12 E. 9 P 3 ) and co-solvent pentanol in a mass ratio of 100:1:3 were mixed evenly to obtain supercritical CO 2 Mix fluids.

[0035] Inject the above-mentioned supercritical CO into the above-mentioned simulated water channeling reservoir 2 Mixed fluid, supercritical CO 2The injection volume of the mixed fluid is 0.3PV, the well is shut down, and the well is soaked for 24h at a temperature of 85°C and an absolute pressure of 60MPa, and then the well is opened for production.

[0036] After testing, the recovery rate of the simulated water channeling reservoir is 29....

Embodiment 2

[0038] Put the tight oil core in the core holder, inject saturated water first, and then inject saturated oil to obtain a simulated water channeling reservoir; the temperature of the simulated water channeling reservoir is 90°C, and the experimental pressure is 50MPa.

[0039] At a temperature of 60°C and an absolute pressure of 10 MPa, the supercritical CO 2 , two (2-ethylhexyl) sodium sulfosuccinate and co-solvent ethanol are mixed uniformly in a mass ratio of 100:1.5:4 to prepare supercritical CO 2 Mix fluids.

[0040] Inject the above-mentioned supercritical CO into the above-mentioned simulated water channeling reservoir 2 Mixed fluid, supercritical CO 2 The injection volume of the mixed fluid is 0.25PV, the well is shut down, and the well is soaked for 24 hours under the conditions of a temperature of 90°C and an absolute pressure of 50MPa, and then the well is opened for production.

[0041] After testing, the recovery rate of the simulated water channeling reservoir...

Embodiment 3

[0043] Put the tight oil core in the core holder, inject saturated water first, and then inject saturated oil to obtain a simulated water channeling reservoir; the temperature of the simulated water channeling reservoir is 80°C, and the experimental pressure is 60MPa.

[0044] At a temperature of 60°C and an absolute pressure of 10 MPa, the supercritical CO 2 , polyoxyethylene lauryl polyoxypropylene ether (C 12 E. 9 P 3 ) and co-solvent amyl alcohol are mixed evenly in a mass ratio of 100:0.8:2.5 to prepare supercritical CO 2 Mix fluids.

[0045] Inject the above-mentioned supercritical CO into the above-mentioned simulated water channeling reservoir 2 Mixed fluid, supercritical CO 2 The injection volume of the mixed fluid is 0.2PV, the well is shut down, and the well is soaked for 24h under the conditions of a temperature of 80°C and an absolute pressure of 60MPa, and then the well is opened for production.

[0046] After testing, the recovery rate of the simulated wat...

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Abstract

The invention provides a method for improving the recovery yield of a water channeling layer. The method comprises the steps executed according to the following sequence: 1, a gas soluble surfactant and supercritical CO2 are evenly mixed to obtain a supercritical CO2 mixed fluid; 2, the supercritical CO2 mixed fluid is injected into a water channeling layer; 3, well shutdown is executed for soaking, and then well opening is executed for exploitation. By adopting the method, deep profile control and effective plugging of the water channeling layer can be achieved, and the recovery yield of thedeep well reservoir is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development engineering, and in particular relates to a method and a system for improving the recovery rate of a water channeling layer. Background technique [0002] my country's oil resources are rich in low-permeability geological reserves, covering one-third of the country's total oil resources, but the low-permeability reserves produced only account for half of the total reserves. Due to the high seepage resistance and low oil well productivity in low-permeability oil fields, hydraulic fracturing is usually used to improve oil well production and single well water injection capacity. However, experiments have shown that this development method is prone to water channeling and fingering, which severely restricts the development efficiency of low-permeability oil and gas fields. [0003] With the increasingly serious environmental problems, people pay more and more attention to CO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B33/138C09K8/594C09K8/42
CPCC09K8/42C09K8/594E21B33/138E21B43/164Y02P20/54
Inventor 刘己全卢培华陈庆国
Owner PETROCHINA CO LTD
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