Self-generating foam blocking removal agent for oil-water well and blocking removal process

A technology of self-generated foam and blocking agent, which is applied in wellbore/well components, cleaning equipment, production fluid, etc., can solve the problems of limited sweeping surface, poor blocking removal effect, single blocking agent additive, etc.

Active Publication Date: 2013-11-20
陕西一诺油气工程技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used plugging agents include hydrochloric acid, earth acid, micellar acid, emulsified acid, foam acid, etc. Among them, when hydrochloric acid and earth acid plugging agents contact with oil layers or water injection layers, the reaction speed is fast, and they cannot go deep into the formation to relieve the formation. Deep clogging, and because of the single plugging agent additive, the effect of unblocking is not good; among them, although micellar acid and emulsified acid reduce the contact time between acid and formation

Method used

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  • Self-generating foam blocking removal agent for oil-water well and blocking removal process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] The plug-removing agent of the present embodiment is composed of A formulation and B formulation in a volume ratio of 1:1,

[0030] Among them, the mass percentage of the formulation of A agent is composed of: 10% HCL, 2% HF, 1% acetic acid, 1% citric acid, 0.3% quinoline benzyl ammonium chloride quaternary ammonium salt, 0.01% potassium iodide, 0.2% propynyl alcohol, 0.1% Naphthenic acid imidazoline acetate, 0.5% fatty alcohol polyoxyethylene ether sulfonic acid, 0.05% dodecyltrimethylammonium chloride, and the rest is water.

[0031] Among them, the mass percentage of the formulation of agent B is composed of: 5% ammonium bicarbonate, 1% potassium carbonate, 1.3% hydrogen peroxide, 0.02% sodium persulfate, 0.05% unsalted imidazoline oleate, 5 mg / L perfluorooctyl Sulfonic acid, 0.05% chloroacetic acid, 0.02% hydroxypropyl cellulose, and the rest is water.

[0032] A and B are mixed according to 1:1, and the corrosion rate is measured with reference to the standard SY / ...

Embodiment 2

[0036] The plug-removing agent of the present embodiment is composed of A formulation and B formulation in a volume ratio of 1:1.3,

[0037] Among them, the mass percentage of agent A formula consists of: 12% HCL, 2% HF, 3% sulfamic acid, 2% formic acid, 2% acetic acid, 2% succinic acid, 0.1% quinoline benzyl chloride quaternary ammonium salt, 0.5 % quinoline dichlorobutane quaternary ammonium salt, 0.4% tributylmethylammonium iodide, 0.7% butynediol, 0.1% oleic acid imidazoline acetate, 0.2% naphthenic acid imidazoline acetate, 0.6% Alkylphenol polyoxyethylene ether sulfonic acid, 0.5% fatty amine polyoxyethylene ether sulfonic acid, 0.05% octadecyl trimethyl ammonium chloride, 0.2% dodecyl dimethyl benzyl ammonium chloride, the rest For clear water.

[0038] Among them, the mass percentage of agent B formula is composed of: 2% sodium carbonate, 0.5% potassium carbonate, 4% ammonium bicarbonate, 1% hydrogen peroxide, 1.5% ammonium persulfate, 3mg / L N-ethyl, N-hydroxyethyl P...

Embodiment 3

[0043] The plug-removing agent of the present embodiment is made up of A formulation and B formulation in a volume ratio of 1.2:1,

[0044] Among them, the mass percentage of agent A formula is composed of: 10% HCL, 1% HF, 2% nitric acid, 2% formic acid, 4% succinic acid, 0.6% quinoline dichlorobenzyl quaternary ammonium salt, 0.5% tetramethyl iodide Ammonium, 0.3% propynyl alcohol, 0.4% naphthenic acid imidazoline acetate, 0.3% fatty alcohol polyoxyethylene ether sulfonic acid, 0.8% fatty amine polyoxyethylene ether sulfonic acid, 0.1% dodecyl dimethyl Benzyl ammonium chloride, 0.2% dodecyl trimethyl ammonium chloride, and the rest is water.

[0045] Among them, the mass percentage of B agent formula is composed of: 2% potassium bicarbonate, 6% ammonium bicarbonate, 3% hydrogen peroxide, 2% ammonium persulfate, 2mg / L N-ethyl, N-hydroxyethyl perfluorooctyl Sulfonyl ammonium phosphate, 2mg / L perfluorooctyl sulfonyl quaternary ammonium oxide, 0.1% unsalted oleic acid imidazolin...

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PUM

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Abstract

The invention relates to a self-generating foam blocking removal agent for an oil-water well and a blocking removal process. The foam blocking removal agent is composed of an agent formula A and an agent formula B, wherein the agent formula A is composed of inorganic acid, organic acid, quinoline quaternary ammonium salt, alkynol, iodine salt, imidazoline acetate, polyethenoxy ether sulfonic acid, dodecyl trimethyl quaternary ammonium salt and clear water; and the agent formula B is composed of carbonate, peroxide, fluorosurfactant, salt-free imidazoline, ferric ion stabilizer, foam stabilizer and clear water. The blocking removal process comprises the following steps: injecting a certain amount of prepad fluid through a cementing truck; then, injecting the agent A through one cementing truck and the agent B through another cementing truck; after the injection of the agent A and the agent B is finished, injecting displacement fluid; then injecting clear water; and shutting in the well, and then performing flowback or directly transferring into production. According to the invention, based on the synergic effect between the surfactants, the injected blocking removal agent has blocking removal effect and simultaneously has profile control and displacement effect for an injection well; and the injected blocking removal agent has blocking removal effect and simultaneously has foam huff and puff effect on an oil well.

Description

technical field [0001] The present invention relates to a plugging removal process, in particular to an oil-water well self-generated foam plugging removal agent and a plugging removal process, which is used to remove the deposits in the oil layer of an oil well and the water injection layer of a water injection well due to the drilling process, fracturing process, operation process, and production process. A high-efficiency deblocking agent and deblocking process for blockage caused by substances, scales, and bacterial reproduction. Background technique [0002] During the drilling process, fracturing process, operation process and production process of the oil well oil layer and the water injection layer in the oil field, it will be blocked by sediments in the fluid, blocked by fluid scaling, and blocked by bacterial reproduction. The clogging leads to the decrease of the conductivity of the oil layer of the oil well and the water injection layer of the water injection wel...

Claims

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Application Information

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IPC IPC(8): C09K8/52C09K8/588E21B37/06E21B43/22
Inventor 杜素珍陶红胜郭学辉俞忠宝余海棠白李李磊
Owner 陕西一诺油气工程技术服务有限公司
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