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Cleanup additive in use for acidification in high temperature

A drainage aid for acidification, high temperature technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing oil and gas phase permeability, affecting acidizing effect, increasing formation water saturation, etc.

Inactive Publication Date: 2006-04-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the invasion of residual acid into the formation will increase the water saturation of the formation, reduce the oil and gas phase permeability in the invaded zone, and directly affect the acidizing effect

Method used

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  • Cleanup additive in use for acidification in high temperature
  • Cleanup additive in use for acidification in high temperature
  • Cleanup additive in use for acidification in high temperature

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Embodiment Construction

[0029] The composition, preparation process and performance parameters of the present invention will be described in detail below in conjunction with examples.

[0030] (1) Raw material performance requirements

[0031] The effective content of dodecyl dimethyl betaine is greater than 96%;

[0032] The effective content of polyoxyethylene perfluorooctyl ether-14 is greater than 98%;

[0033] The effective content of 2,3 epoxypropyltrimethylammonium chloride is greater than 96%;

[0034] The effective content of methanol is greater than 90%.

[0035] (2) Preparation examples and performance parameters of drainage aids for high temperature acidification

[0036] Add 340kg of water and 340kg of methanol into the started 1m3 emulsifier, raise the temperature to 30°C, and add 28kg2,3 epoxypropyltrimethylammonium chloride, 2kg of polyoxyethylene perfluorooctyl ether-14 and 310kg of dodecyl dimethyl betaine, stirred to form a uniform transparent solution, packed in a 200kg plasti...

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Abstract

A draining aid for high-temp acidifying is proportionally prepared from dodecyldimethyl betaine, polyoxyvinyl perfluorooctylether-14,2, 3-epoxypropyltrimethyl ammonium chloride, methanol and water. When it is proportionally added to hydrochloric acid solution, the surface tension of acid solution is decreased to that less than 22 mN / m.

Description

Technical field: [0001] The invention relates to a chemical agent for oilfield acidification, especially a drainage aid for high-temperature acidification. Background technique: [0002] During the acidizing process, the acid is gradually consumed as the acid-rock reaction proceeds, and the pH value of the residual acid increases with the prolongation of its residence time in the formation. When the pH value of the residual acid is greater than 2.2, the Fe in the acid-dissolved product 3+ will start to produce Fe(OH) 3 precipitation, and the amount of precipitation increases with the increase of pH; when the pH reaches 3.2, Fe 3+ Basically all form gel-like Fe(OH) 3 Precipitation, gel-like Fe(OH) 3 Can cause severe damage to reservoir permeability. In addition, the invasion of residual acid into the formation will increase the water saturation of the formation, reduce the oil and gas phase permeability in the invaded zone, and directly affect the acidizing effect. In or...

Claims

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Application Information

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IPC IPC(8): C09K8/74
Inventor 孙铭勤张贵才葛际江
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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