Method for improving oil field recovery rate

A recovery factor, oilfield technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of profile control, deep liquid flow diversion cannot be carried out synchronously, difficult on-site implementation, shear thinning, etc.

Active Publication Date: 2012-03-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the development process, the following problems often appear: prominent plane contradictions, plane injection water rushes along the high-permeability zone to form water channels; prominent interlayer contradictions, uneven production and suction profiles, and single-layer breakthroughs in the vertical direction; high viscosity of underground crude oil, oil-water High viscosity ratio, serious viscous fingering phenomenon, etc.
In recent years, although tertiary oil recovery measures such as polymer flooding have achieved good results, there are still problems such as high cost of oil displacement and difficulty in field implementation; In oil reservoirs, there are still serious problems of channeling in some wells, which affects the effect of polymer injection. Moreover, due to the limitations of the polymer itself, the effective viscosity loss in high-temperature and high-salinity formations is very large, which often cannot be reached. to the intended purpose
ASP flooding technology has gradually been widely used in Daqing and othe

Method used

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  • Method for improving oil field recovery rate
  • Method for improving oil field recovery rate
  • Method for improving oil field recovery rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] This embodiment provides a pre-crosslinked gel particle for profile control and deep liquid flow diversion, which has the following raw material composition:

[0083]

[0084] Wherein, the ratio of the stable crosslinking agent to the monomer is 1:3000, and the ratio of the unstable crosslinking agent to the monomer is 1:300.

[0085] The pre-crosslinked gel particles for profile control and deep liquid flow diversion provided in this example were prepared according to the following steps:

[0086] Add 30 grams of acrylamide into 100 grams of distilled water to fully dissolve to obtain an acrylamide solution, which is the first monomer solution;

[0087] Add 1 g of methylene bisacrylamide into 100 g of distilled water and fully dissolve to obtain a methylene bisacrylamide solution, which is a stable crosslinking agent solution;

[0088] Add 1 g of methylenebisacrylamide solution into the acrylamide solution to obtain the first mixed solution;

[0089] Inject nitrogen...

Embodiment 2

[0107] This embodiment provides a pre-crosslinked gel particle for profile control and deep liquid flow diversion, which has the following raw material composition:

[0108]

[0109] Wherein, the ratio of the stable crosslinking agent to the monomer is 1:3000, and the ratio of the unstable crosslinking agent to the monomer is 1:300.

[0110] The preparation process of the pre-crosslinked gel particles for profile control and deep liquid flow diversion provided in this example can refer to Example 1, except for the amount of raw materials and additives, others are the same.

Embodiment 3

[0112] This embodiment provides a pre-crosslinked gel particle for profile control and deep liquid flow diversion, which has the following raw material composition:

[0113]

[0114] Wherein, the ratio of the stable crosslinking agent to the monomer is 1:3000, and the ratio of the unstable crosslinking agent to the monomer is 1:300.

[0115] The preparation process of the pre-crosslinked gel particles for profile control and deep liquid flow diversion provided in this example can refer to Example 1, except for the amount of raw materials and additives, others are the same.

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Abstract

The invention relates to a method for improving the oil field recovery rate. The method for improving the oil field recovery rate is characterized by using profile control and deep flow diversion dual functional blasting type pre-cross-linked gel particles for improving the oil field recovery rate, wherein the profile control and deep flow diversion dual functional blasting type pre-cross-linked gel particles are gel particles formed by initiating polymerization cross-linking of a monomer, a stable cross-linking agent and an unstable cross-linking agent by an initiator, and drying and grinding the obtained main gel. In reservoir production operation, when the method for improving the oil field recovery rate by pre-cross-linked gel particles for profile control and deep flow diversion, provided by the invention, is used, dual effects of profile control and deep flow diversion can be realized, and simultaneously, the blasting time of the pre-cross-linked gel particles can be controlled by adjusting the concentrations of the stable cross-linking agent and the unstable cross-linking agent, thereby achieving the purpose of controlling the operation period.

Description

technical field [0001] The invention relates to a method for increasing oil recovery, in particular to a method for improving oil recovery by utilizing profile control and deep liquid flow diversion dual-function blasting pre-crosslinked gel particles, which belongs to the technical field of oil exploitation. Background technique [0002] With the continuous development of oilfields, the heterogeneity of reservoirs is becoming more and more serious. A large amount of injected water scours, swelling and dissolution of clay and cement in oil layers, migration of particles, and aggravation of sand production will cause further deterioration of geological heterogeneity. . During the development process, the following problems often appear: prominent plane contradictions, plane injection water rushes along the high-permeability zone to form water channels; prominent interlayer contradictions, uneven production and suction profiles, and single-layer breakthroughs in the vertical d...

Claims

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Application Information

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IPC IPC(8): E21B43/25C09K8/60C09K8/44
Inventor 贾旭唐孝芬王家禄刘玉章白宝君周佳杨立民
Owner PETROCHINA CO LTD
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