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Process of deep profile control over low-permeability oil reservoir

A deep profile control, low permeability technology, applied in the wellbore/well components, drilling composition, production fluid, etc., can solve the problem of high initial viscosity of solution, difficult to low permeability oil reservoir deep profile control, difficult to use profile control agent. Gel formation and other problems, to achieve the effect of improving profile control effect, good expansion capacity, and improving sweep efficiency

Inactive Publication Date: 2015-05-13
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these two polymers have viscosity-increasing properties, the initial viscosity of the prepared solution is relatively high, making it difficult to perform deep profile control on low-permeability reservoirs; in addition, under the conditions of low-permeability reservoirs, general profile control agents Difficult to gel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Based on the reservoir data, using the formula It is calculated that the deep profile control amount of the low permeability reservoir is about 1500m 3 , the specific steps of the profile control process are as follows:

[0030] The first step, at a speed of 2m 3 / h injects RD-20 movable jelly profile control agent into the oil layer, and the mass components of the RD-20 movable jelly profile control agent are: 0.2% zwitterionic polymer, 0.2% crosslinking agent A, 0.2% % glue accelerator B, the rest is water; injection volume is 100m 3 .

[0031] The second step is to use RD-20 movable jelly profile control agent to suspend and carry slow-swelling flexible particles. The slow-swelling flexible particles account for 0.5% of the total mass of the system, and the injection volume is 100m 3 .

[0032] The third step, at a speed of 2m 3 / h inject composite particle profile control agent into the oil layer, the mass components of the composite particle profile control ...

Embodiment 2

[0036] Based on the reservoir data, using the formula It is calculated that the deep profile control amount of the low permeability reservoir is about 1800m 3 , the specific steps of the profile control process are as follows:

[0037] The first step, at a speed of 2m 3 / h inject RD-15 movable jelly profile control agent into the oil layer, the mass components of the RD-15 movable jelly profile control agent are: 0.15% zwitterionic polymer, 0.15% crosslinking agent A, 0.15% % glue accelerator B, the rest is water; injection volume is 100m 3 .

[0038] The second step is to use RD-15 movable jelly profile control agent to suspend and carry slow-swelling flexible particles. The slow-swelling flexible particles account for 0.5% of the total mass of the system, and the injection volume is 100m 3 .

[0039] The third step, at a speed of 2m 3 / h inject composite particle profile control agent into the oil layer, the mass components of the composite particle profile control ag...

Embodiment 3

[0043] Based on the reservoir data, using the formula It is calculated that the amount of deep profile control in low permeability reservoirs is about 1000m 3 , the specific steps of the profile control process are as follows:

[0044] The first step, at a speed of 1.5m 3 / h inject RD-25 movable jelly profile control agent into the oil layer, the mass components of the RD-25 movable jelly profile control agent are: 0.25% zwitterionic polymer, 0.25% crosslinking agent A, 0.25% % glue accelerator B, the rest is water; injection volume is 100m 3.

[0045] The second step is to use RD-25 movable jelly profile control agent to suspend and carry slow-swelling flexible particles. The slow-swelling flexible particles account for 0.3% of the total mass of the system, and the injection volume is 100m 3 .

[0046] The third step, at a speed of 2m 3 / h inject composite particle profile control agent into the oil layer, the mass components of the composite particle profile control a...

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PUM

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Abstract

The invention provides a process of deep profile control over a low-permeability oil reservoir. The process comprises the steps that firstly, an RD movable jelly profile control agent is injected into an oil layer; secondly, retarding swelling soft particles are carried by the RD movable jelly profile control agent in a suspended mode and injected into the oil layer; thirdly, a composite particle profile control agent is injected into the oil layer so as to block a high-permeability channel; fourthly, an RD movable jelly profile control agent is injected into the oil layer again to push the particles to the deep so as to perform deep profile control. The RD movable jelly profile control agent comprises, by mass, 0.05%-0.25% of amphoteric ionic polymer, 0.05%-0.25% of cross-linking agent A, 0.05%-0.25% of gel promoting agent B and the balance of water. The composite particle profile control agent comprises, by mass, 0.2%-2% of retarding swelling soft particles, 0.05%-0.25% of amphoteric ionic polymer, 0.1%-0.5% of cork particles and the balance of water. By means of the process, the gelling performance and gelling strength of a profile control system under the low-permeability oil reservoir condition can be improved, so that deep profile control over the low-permeability oil reservoir is achieved, and the crude oil recovery ratio is increased.

Description

technical field [0001] The invention relates to a deep profile control process for water injection wells in the petroleum industry, in particular to a profile control process for deep profile control in low-permeability oil reservoirs. Background technique [0002] In the process of waterflooding development of low permeability reservoirs, with the long-term scouring of injected water, dominant seepage channels are formed, forming the phenomenon of fingering of injected water, which makes the heterogeneity of reservoirs increasingly prominent, seriously affecting the effect of waterflooding development in oilfields. Currently, the most widely used polymers in deep reservoir profile control are biopolymer xanthan gum and partially hydrolyzed polyacrylamide (HPAM). Since these two polymers have viscosity-increasing properties, the initial viscosity of the prepared solution is relatively high, and it is difficult to perform deep profile control on low-permeability reservoirs; i...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCC09K8/5083C09K8/512C09K2208/04E21B33/13
Inventor 李永太袁彬李辰韩超超
Owner XI'AN PETROLEUM UNIVERSITY
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