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Anti-shearing crosslinking-delayed organic profile control agent

A technology of delayed cross-linking and profile control agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc. It can solve the problems of failure to plug fractures, decrease in strength, and failure to meet the requirements of profile control in low-permeability fracture formations, etc. , to achieve the effect of enhancing recovery

Inactive Publication Date: 2014-04-02
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages that the strength of the existing control and displacement agents decreases greatly after being sheared in the near-well zone of the water well, and cannot meet the requirements of sealing fractures and profile control of low-permeability fracture formations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] An anti-shear delay cross-linking organic profile control agent, the components of the profile control agent and their volume molar concentrations are: 0.4% of 8 million molecular weight anionic polyacrylamide, 0.1% of sodium dichromate, 0.4% of thiourea, Sodium sulfite 0.05%, under the conditions of PH value between 6-9 and temperature of 60°C, reacts to form an anti-shear delayed cross-linking organic profile control agent. After gelation, the strength is 26000mPa·s, and the absorption profile changes significantly after implementation.

Embodiment 2

[0009] An anti-shear delayed cross-linking organic profile control agent, the components of the profile control agent and their volume molar concentrations are: 0.6% of 8 million molecular weight anionic polyacrylamide, 0.2% of sodium dichromate, 0.6% of thiourea, Sodium sulfite 0.05%, under the conditions of PH value between 6-9 and temperature of 60 ℃, reacts to form an anti-shear delayed cross-linking organic profile control agent, the strength after gelation is 58000mPa·s, and the absorption profile changes obviously after implementation.

Embodiment 3

[0011] An anti-shear delay cross-linking organic profile control agent, the components of the profile control agent and their volume molar concentrations are: 0.45% of 8 million molecular weight anionic polyacrylamide, 0.15% of sodium dichromate, 0.5% of thiourea, Sodium sulfite 0.05% reacts at a pH value of 6-9 and a temperature of 60°C to form an anti-shear delayed cross-linking organic profile control agent. The strength of the gel is 37800mPa·s, and the absorption profile changes significantly after implementation.

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PUM

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Abstract

The invention relates to the technical field of profile control and displacement of oil field water injection wells, and in particular to an anti-shearing crosslinking-delayed organic profile control agent. The profile control agent comprises the following components with the following molar concentrations: 0.4-0.6% of anionic polyacrylamide with molecular weight of 8 million, 0.1-0.2% of sodium dichromate, 0.4-0.6% of thiourea and 0.05% of sodium hydrosulphite. The invention realizes gelation strength meeting the need of profile control of low permeability fractured reservoir after stratum shearing, and can control the gelation time by adjusting the concentration of the stabilizer, so as to meet the requirements of oil reservoir with different well spacing and raise recovery efficiency. The invention overcomes the insufficiencies that existing flooding agent, after shearing in immediate vicinity of wellbore, has greatly decreased intensity, and cannot reach the requirements of sealing cracks or meet the requirements of profile control of low permeability fractured reservoir.

Description

Technical field: [0001] The invention relates to the technical field of profile control and profile control of water injection wells in oil fields, in particular to an anti-shear delayed cross-linking organic profile control agent. Background technique: [0002] When the oil field is developed by water injection to the medium-high water cut period, the technology of profile control and profile control is an important means to enhance the recovery rate. For low permeability reservoirs, fracturing is generally used to increase production in order to improve the recovery rate. After water injection development, the water injected along the Fractures burst in, causing rapid water flooding of oil wells. Since the wells have not been fractured and put into production, the strength of ordinary control and displacement agents has dropped significantly after being sheared in the near-wellbore zone of the water well, which cannot meet the requirements for sealing fractures and cannot m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/5083C09K8/512
Inventor 邱衍辉刘涛王桂杰边朝亮汤琦雷宁郭宜民方宗元迟淑梅李雪梅徐海波刘生平李度兵王国成王品毅
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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