Low pervasion oilfield thermochemical cleanup additive and use thereof

A low-permeability, thermochemical technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient flowback strength and high construction costs, and achieve the effect of complete flowback

Inactive Publication Date: 2008-12-17
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this thermochemical drainage aid can fully combine the advantages of nitrogen and carbon dioxide as a drainage aid, and at the same time solve the problems of insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of agent A: first add 78.68% water to the container, then add 21% sodium nitrite, 0.15% sodium dodecylbenzenesulfonate, 0.15% emulsifier polyoxyethylene octylphenol ether, 0.02% The fluorosurfactant is made into agent A after stirring evenly.

[0024] Preparation of agent B: put 12% urea and 12% ammonium chloride in another container, add 76% water, stir evenly, and prepare agent B after it is completely dissolved.

Embodiment 2

[0026] Preparation of agent A: first add 78.08% water to the container, then add 21% sodium nitrite, 0.15% sodium dodecylbenzenesulfonate, 0.15% emulsifier polyoxyethylene octylphenol ether, 0.02% Fluorosurfactant and 0.6% phosphoric acid, stir well to make A agent.

[0027] Preparation of agent B: put 5% urea and 10% ammonium chloride in another container, add 85% water, stir evenly, and prepare agent B after it is completely dissolved.

Embodiment 3

[0029] Preparation of agent A: first add 89.6% water to the container, then add 10% sodium nitrite, 0.10% sodium dodecylbenzenesulfonate, 0.10% emulsifier polyoxyethylene octyl phenol ether, 0.001% Fluorosurfactant and 0.199% phosphoric acid are mixed evenly to make Agent A.

[0030] Preparation of agent B: put 20% urea and 20% ammonium chloride in another container, add 60% water, stir evenly, and prepare agent B after it is completely dissolved.

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PUM

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Abstract

The invention discloses a low permeability oil field thermochemical cleanup additive and applications thereof in acidification and fracturing technologies of low permeability oil field oil and water wells. The thermochemical cleanup additive consists of an agent A and an agent B. The agent A consists of certain parts by weight of phosphoric acid, sodium nitrite, dodecyl benzene sulphonic acid, emulsifier, surfactant and water; the agent B consists of certain parts by weight of urea, ammonium chloride and water. The agent A and the agent B thermally react under certain conditions to produce a large amount of nitrogen, carbon dioxide and high-temperature-hot-water and a large amount of heat simultaneously; in addition, the nitrogen and the carbon dioxide with certain pressure can form a large amount of bubbles under the function of a highly efficient active foaming agent for residues to be drained out of the oil and water wells. The thermochemical cleanup agent does not burn or explode easily and is mainly applied to the cleanup technology of the acidification and fracturing techniques of the low permeability oil and water wells for solving the problems such as inadequate drainage strength, reducing pollutions of remaining operating fluid to reservoir stratums and effectively enhancing the acidification and fracturing effects.

Description

technical field [0001] The invention relates to a thermochemical drainage aid used in the acidification and fracturing process of oil-water wells in low-permeability oilfields and its application. Background technique [0002] Acidizing is to inject acid liquid into the formation to dissolve the mineral components of the reservoir rock and the substances that cause the clogging of the reservoir during drilling, completion, workover and oil production, so as to improve and enhance the permeability of the reservoir, thereby increasing the production and production of oil wells. Water well injection; fracturing is to use the surface high-pressure pump group to pump high-viscosity fracturing fluid into the well with a displacement exceeding the absorption capacity of the formation to generate fractures in the formation, and add proppant (such as quartz sand, etc.) to fill the fractures to improve The conductivity of the formation, thereby improving the stimulation of oil wells a...

Claims

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Application Information

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IPC IPC(8): C09K8/60
Inventor 陈军斌王俊奇盖海防朱宏伟
Owner XI'AN PETROLEUM UNIVERSITY
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