Plugging agent used for adjustment of water absorption section of immovable string of water injection well, and adjustment process of water absorption section

A technology for water absorption profiles and water injection wells, which can be used in wellbore/well components, production fluids, drilling compositions, etc., and can solve problems such as uneven water absorption

Active Publication Date: 2019-02-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process provided by the present invention can solve the problem of uneven water absorption in the section of water injection wells with p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a process for adjusting the water absorption profile of a fixed pipe string in a water injection well, wherein the process includes the following specific steps:

[0053] The plugging agent used in this embodiment includes long-term plugging agent and water-soluble temporary plugging agent;

[0054] Wherein, based on the total weight of the water-soluble temporary blocking agent as 100%, the water-soluble temporary blocking agent consists of 6% organic silicon resin, 2% octadecyl dimethyl betaine, 0.5% hydroxypropyl Guar gum, 0.3% polytitanoxane, 0.2% sodium chloride and the rest of the water;

[0055] Taking the total weight of the long-blocking agent as 100%, the long-blocking agent consists of 20% water glass, 5% sodium methyl silicate, 2% organosilicon modified epoxy modified resin, 0.5% It is composed of polyacrylamide, 0.3% oligomeric quaternary ammonium salt type clay stabilizer, 0.1% triethanolamine and the rest water.

[0056] The tot...

Embodiment 2

[0066] This embodiment provides a process for adjusting the water absorption profile of a fixed pipe string in a water injection well, wherein the process includes the following specific steps:

[0067] The blocking agent used in this embodiment is a long blocking agent;

[0068] Wherein, the total weight of the long-blocking agent is 100%, and the long-blocking agent consists of 22% water glass, 6% sodium methyl silicate, 2% organosilicon modified epoxy modified resin, 0.8 % polyacrylamide, 0.3% oligomeric quaternary ammonium clay stabilizer, 0.2% triethanolamine and the rest water.

[0069] The total weight of the chelating acid used in the present embodiment is 100%, and the chelating acid consists of 30% hydrochloric acid, 38% hydrofluoric acid, 15% acetic acid, 4% triacetoxylindole, 6% aminotriacetic acid, 5% iron ion stabilizer and the rest water.

[0070] When injecting plugging agent and chelating acid, the construction steps adopt:

[0071] ① Inject 5m 3 Clear wat...

Embodiment 3

[0077] This embodiment provides a process for adjusting the water absorption profile of a fixed pipe string in a water injection well, wherein the process includes the following specific steps:

[0078] The blocking agent used in this embodiment is a water-soluble temporary blocking agent;

[0079] Wherein, based on the total weight of the water-soluble temporary blocking agent as 100%, the water-soluble temporary blocking agent consists of 7% silicone resin, 2% octadecyl dimethyl betaine, 0.9% hydroxypropyl Guar gum, 0.5% polytitanoxane, 0.3% sodium chloride and the rest of the water;

[0080] With the total weight of the chelating acid used in the present embodiment as 100%, the chelating acid consists of 31% hydrochloric acid, 35% hydrofluoric acid, 17% acetic acid, 5% triacetoxylindole, 5% aminotriacetic acid, 5% iron ion stabilizer and the rest water.

[0081] When injecting plugging agent and chelating acid, the construction steps adopt:

[0082] 1) Inject 4m 3 chela...

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PUM

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Abstract

The invention provides a plugging agent used for adjustment of a water absorption section of an immovable string of a water injection well, and an adjustment process of the water absorption section. The process comprises the steps that a certain quantity of the plugging agent used for adjustment of the water absorption section of the immovable string of the water injection well is injected into atarget layer of the water injection well to temporarily or permanently plug a high-permeability preferential migration passage partially or totally at first; and after the high-permeability preferential migration passage is plugged, chelating acid liquid is injected into the water injection well online to realize acidification transformation of a low-permeability or stratum polluted segment. The adjustment process of the water absorption section of the immovable string of the water injection well, which is provided by the invention, can solve the problem of water absorption in a peak state ornonuniform water absorption of the water injection well section of the preferential migration passage, and accordingly the purpose of uniform water absorption of different segments in the layer is realized.

Description

technical field [0001] The invention relates to a plugging agent for adjusting the water absorption profile of a fixed pipe string of a water injection well and a process for adjusting the water absorption profile, in particular to a technology for adjusting the water absorption profile of a water injection well with a non-uniform pipe string, and belongs to the technical field of oil field water injection development . Background technique [0002] In Changqing Oilfield, especially in under-injection wells in low-permeability reservoirs, there are a large number of problems of uneven water absorption in layers, and low-permeability reservoirs have strong reservoir heterogeneity. The early-developed ultra-low permeability oil fields such as Ansai and Jing'an have entered the medium-high water cut period, with a comprehensive water cut of 59%. Effective displacement has not been established, and the degree of water drive is low. To solve this problem, there are conventional...

Claims

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Application Information

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IPC IPC(8): C09K8/514E21B33/13E21B43/22
CPCC09K8/514E21B33/13E21B43/16
Inventor 宋昭杰陆红军张随望吴天江陆小兵王勇王尔珍邓志颖隋蕾
Owner PETROCHINA CO LTD
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