Fluoride-free cleanup additive used for acidifying

A technology of drainage aid and drainage aid for acidification, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as high price

Inactive Publication Date: 2012-09-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the surface tension of acidizing drainage aids used in oil fields is generally between 22-30mN / m, but these drainage aids are all added with fluorine-containing surfactants, such as Chinese invention patents ZL200510044934.6 and ZL200910083139.6, Although fluorine-containing surfactants can effectively reduce surface tension, they are expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 250kg of methanol to the enamel liner reactor, then weigh 400kg of dodecyltrimethylammonium bromide and 50kg of fatty alcohol polyoxyethylene ether into the reactor, stir at 50°C for 2 hours, and finally add 300kg of water , and mix uniformly to obtain a drainage aid.

Embodiment 2

[0013] Add 200kg of ethylene glycol into the enamel liner reactor, then weigh 300kg of cetyl pyridinium bromide and 100kg of bishydroxyethyl dodecylamide into the reactor, stir at 50°C for 2 hours, and finally add 400kg of water, mixed evenly to obtain the drainage aid.

Embodiment 3

[0015] Add 150kg of methanol into the enamel liner reactor, weigh 200kg of octadecyltrimethylammonium bromide and 100kg of bishydroxyethyl dodecylamide into the reactor, stir at 50°C for 2 hours, and finally Add 550kg of water and mix evenly to obtain a drainage aid.

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PUM

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Abstract

The invention relates to a fluoride-free cleanup additive used for acidifying, which is composed of a main agent, a reinforcing agent, a cosolvent and water. the main agent is alkyl trimethyl ammonium bromide or alkyl bromid pyridine, wherein the alkyl can be dodecyl, cetyl or octadecyl, the main agent accounts for 20-50% of the cleanup additive by weight percentage, the reinforcing agent is fatty alcohol polyoxyethylene ether, dihydroxyethyl dodecyl amide or cocamidopropyl dimethyl betaine, the reinforcing agent accounts for 1-10% of the cleanup additive by weight percentage, the cosolvent is a mixture of one or more of methanol, ethanol or glycol, the cosolvent accounts for 5-25% of the cleanup additive by weight percentage, and the balance is water. The cleanup additive is capable of effectively reducing the capillary force in stratum, rapidly discharging the residual acid liquid out of the stratum and reducing the damage to the stratum.

Description

technical field [0001] The invention relates to a drainage aid used in acidification during oil and gas field development, in particular to a fluorine-free drainage aid. technical background [0002] Acidification and acid fracturing are effective means to decontaminate formations and transform low-permeability formations. However, since acid liquid enters formations and reacts with metal salts in formations, various metal ions are formed, especially iron, calcium, and magnesium ions. As the pH of the liquid increases, these ions will form precipitates and block the oil and gas channels, failing to achieve the purpose of increasing production. Therefore, after the acidizing or acid fracturing construction, the liquid entering the formation should be returned to the formation as soon as possible to reduce the retention of the liquid in the formation and reduce the damage to the reservoir. In this way, it is necessary to add a drainage aid to the acid system. Drainage aid can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 赵金洲李勇明张烨李莲明彭翔
Owner SOUTHWEST PETROLEUM UNIV
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