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Method for carrying out profile control on fracture-type oil reservoir

A technology for profile control and oil reservoir, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as poor effect, pollution of lateral oil wells, failure to block profile control of fractured reservoirs, etc., to achieve The effect of maintaining performance, reducing damage, and facilitating gelation reaction

Active Publication Date: 2013-07-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for profile control of fractured reservoirs, which solves the problems that the current profile control of fractured reservoirs cannot be blocked, and the lateral oil wells are seriously polluted and the effect is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First inject 200m of zwitterionic polymer aqueous solution with a molecular weight of more than 15 million, a cationic degree of 5-10%, an anionic degree of less than 5-20%, and a mass concentration of 0.2%. 3 , to drive away the water in the fracture, and at the same time adsorb on the side of the fracture to protect the micro-cracks and matrix pores; then inject 500m 3 The 0.5% zwitterionic jelly carries 0.5% slow-swelling granular profile control agent to seal the fracture deeply; then inject 6% high-strength acrylic gel 50m 3 , to seal near-wellbore fractures; finally use 0.1% partially hydrolyzed polyacrylamide plus 0.2% surface active 1000m 3 Carry out oil flooding. Using this technology, the fluid production of the fractured main direction oil well decreased after the measures were taken, the average oil increase of the well group was 6%, and the water cut decreased by 10%.

Embodiment 2

[0024] First inject 100m of zwitterionic polymer aqueous solution with a molecular weight of more than 15 million, a cationic degree of 5-10%, an anionic degree of less than 5-20%, and a mass concentration of 0.2%. 3 , to drive away the water in the fracture, and at the same time adsorb on the side of the fracture to protect the micro-cracks and matrix pores; then inject 1000m 3 The 0.7% zwitterionic jelly carries 1.0% slow-swelling particle profile control agent to seal the fracture deeply; then inject 6% high-strength acrylic gel 100m 3 , to seal near wellbore fractures; finally use 0.1% partially hydrolyzed polyacrylamide plus 0.2% surface active 2000m 3 Carry out oil flooding. Using this technology, the fluid production of the fractured main direction oil well decreased after the measures were taken, the average oil increase of the well group was 8%, and the water cut decreased by 13%.

Embodiment 3

[0026] First inject 50m of zwitterionic polymer aqueous solution with a molecular weight of more than 15 million, a cationic degree of 5-10%, an anionic degree of less than 5-20%, and a concentration of 0.2%. 3 , drive the water in the fracture, and at the same time adsorb on the side of the fracture to protect the micro-cracks and matrix pores; then inject 2000m 3 The 1.2% zwitterionic jelly carries 1.5% slow-swelling particle profile control agent to seal the fracture deeply; then inject 6% high-strength acrylic gel 150m 3 , to seal near wellbore fractures; finally use 0.2% partially hydrolyzed polyacrylamide plus 0.2% surface active 2000m 3 Carry out oil flooding. Using this technique, the liquid production of the fractured main direction oil well decreased after the measures were taken, the average oil increase of the well group was 12%, and the water cut decreased by 18%.

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Abstract

The invention relates to a method for carrying out profile control on a fracture-type oil reservoir, which comprises the following steps of injecting 0.1 to 0.3 percent of zwitterionic polymer solution into an oil layer; suspending and carrying expansion-retarding 0.2 to 1.0 percent of salt-resistance high-intensity water-absorbent resin particles by a zwitterionic gel profile control agent and injecting the obtained product into a fracture of the oil layer; injecting 30 to 50m<3> of acrylamide gel; suspending 0.2 to 0.5 percent of water insoluble solid particles by the zwitterionic gel profile control agent and injecting the obtained product into the fracture; and alternately injecting 1,000m<3> of partially hydrolyzed polyacrylamide solution with a molecular weight of 15 million, degree of hydrolysis of 10 to 20 percent and 1,000m<3> of petroleum sulfonate surfactant solution, wherein the concentration of the hydrolyzed polyacrylamide solution is 0.05 to 0.15 percent and the concentration of the petroleum sulfonate surfactant solution is 0.2 to 0.5. According to the method, profile control and flooding effects of the fracture-type oil reservoir can be improved; water content of a fracture main direction oil well is reduced; and yield of crude oil of a fracture side direction oil well is increased.

Description

technical field [0001] The invention relates to a method for profile control of a fractured oil reservoir. Background technique [0002] The traditional method of profile control for fractured reservoirs is to use underground gelling technology (that is, the injected profile control agent is gelled under the conditions of the reservoir), which has two disadvantages. Disadvantage 1: The small molecular substances in the profile control agent can easily enter the lateral micro-fractures and matrix pores in addition to entering the reservoir fractures. It can not only block the water flow channels in the lateral micro-fractures and matrix pores of the oil layer, It can also block the oil flow channel. Disadvantage 2: The leakage of the profile control agent in the fractures of the oil layer is very serious. Whether it is the main agent or the crosslinking agent or other additives, the fluid loss in the fractured reservoir is much more serious than that in the porous reservoir;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/22
Inventor 徐春梅李宪文郭方元杨海恩李永太王兴宏陈洪涛陈荣环张荣刘保彻朱家杰黎晓茸
Owner PETROCHINA CO LTD
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