Fractured reservoir profile control process

A profile control and process technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of reducing the effective amount of oil layer fracture plugging, loss of profile control agent, increase in fluid loss, etc. , to achieve the effect of improving the profile control effect, not decreasing the performance, and increasing the daily oil production

Inactive Publication Date: 2014-05-14
XIAN JIAOTONG UNIV JINGSHENG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 reservoir 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; The increase in the amount of the profile control agent reduces the effective amount of oil layer fracture plugging accordingly; the fluid loss of the active ingredients in the profile control agent leads to the weakening of the strength of the profile control agent after gelation, or even no gelation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The fracture volume is about 600m 3 ,

[0024] The fractured reservoir profile control process includes the following steps,

[0025] The first step is to inject a slug of zwitterionic polymer solution with a concentration of 0.2% into the oil layer, and the injection volume is 15m per meter of oil layer thickness 3 , the molecular weight of the zwitterionic polymer is 18 million, the cationic degree is 8%, and the anionic degree is 15%;

[0026] The second step is to use zwitterionic jelly profile control agent, suspend and carry 0.6% slow-swelling and anti-salt high-strength water-absorbing resin particles, and inject them into the fractures of the oil layer. The injection volume is 1 / 3 of the fracture volume, that is, 200m 3 , the quality components of the zwitterionic jelly profile control agent are: 0.2% zwitterionic polymer, 0.2% composite crosslinking agent, and the rest is water; the molecular weight of the zwitterionic polymer is 18 million, and the cationic ...

Embodiment 2

[0031] Fracture volume is about 630m 3 ,

[0032] The fractured reservoir profile control process includes the following steps,

[0033] The first step is to inject a slug of zwitterionic polymer solution with a concentration of 0.1% into the oil layer, and the injection volume is 20m per meter of oil layer thickness 3 , the molecular weight of the zwitterionic polymer is 20 million, the cationic degree is 10%, and the anionic degree is 5%;

[0034] The second step is to use zwitterionic jelly profile control agent, suspend and carry 0.2% slow-swelling and anti-salt high-strength water-absorbing resin particles, and inject them into the fractures of the oil layer. The injection volume is 1 / 3 of the fracture volume, that is, 210m 3 , the mass components of the zwitterionic jelly profile control agent are: 0.1% zwitterionic polymer, 0.3% composite crosslinking agent, and the rest is water; the molecular weight of the zwitterionic polymer is 20 million, and the cationic degree ...

Embodiment 3

[0039] Fracture volume is about 570m 3 ,

[0040] The fractured reservoir profile control process includes the following steps,

[0041] The first step is to inject a slug of amphoteric ion polymer solution with a concentration of 0.3% into the oil layer, and the injection volume is 10m per meter of oil layer thickness 3 , the molecular weight of the zwitterionic polymer is 30 million, the cationic degree is 5%%, and the anionic degree is 20%;

[0042] The second step is to use zwitterionic jelly profile control agent, suspend the slow-swelling and anti-salt high-strength water-absorbing resin particles with a concentration of 1.0%, and inject them into the fractures of the oil layer. The injection volume is 1 / 3 of the fracture volume, that is, 190m 3 , the mass components of the zwitterionic jelly profile control agent are: 0.3% zwitterionic polymer, 0.1% composite crosslinking agent, and the rest are water; the molecular weight of the zwitterionic polymer is 30 million, an...

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PUM

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Abstract

The invention relates to a fractured reservoir profile control process. The process includes the steps: firstly, injecting a zwitterionic polymer solution slug into a reservoir; secondly, using a zwitterionic gel profile control agent to suspend and carry retarding salt-resistant high-strength water-absorbent resin particles, and injecting into reservoir fractures; thirdly, injecting 40m<3> of acrylamide gel to block the ends of the fractures; fourthly, using clay adhesive to suspend water-insoluble solid particles, and injecting into the fractures; fifthly, alternatively injecting part of a hydrolysis polyacrylamide solution and a petroleum sulfonate surfactant solution. By the process, damage to small fractures and matrix pores is reduced, performance of the profile control agent in large and intermediate fractures is ensured not to be reduced, swept volume and displacement efficiency of injected fluid in a large-intermediate fracture lateral reservoir are increased, and profile control effect is achieved finally.

Description

technical field [0001] The invention relates to oil reservoir profile control technology, in particular to a fractured oil reservoir profile control technology. 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 reservoir is very serious. Whether it is the main agent or the crosslinking agent or other additives, the fluid loss in the fractured reservoir i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/42
Inventor 田边
Owner XIAN JIAOTONG UNIV JINGSHENG SCI & TECH DEV
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