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A composite plugging removal agent and a composite plugging removal method for fracturing and putting into production horizontal wells in tight sandstone reservoirs

A composite plugging removal agent and plugging removal technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well parts, etc., can solve problems that cannot meet the use requirements, achieve enhanced oil recovery, convenient operation, The effect of enhanced oil recovery

Active Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite plugging remover to solve the problem that the existing single plugging remover cannot meet the requirements of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composite plug-removing agent of this embodiment includes a pre-treatment liquid, a main treatment liquid, an active plug-removing liquid and a post-position liquid;

[0035] The pretreatment liquid is composed of the following components in weight percentage: 3.0% acetic acid, 3.0% hydrochloric acid, 3.0% hydrofluoric acid, 2.0% potassium chloride, 0.01% ammonium persulfate, 0.5% ethylenediaminetetraacetic acid, butyl 0.6% acetylene glycol, 0.2% alkylphenol polyoxyethylene ether, 0.5% propylene glycol methyl ether, and the balance is water; the water in the pretreatment liquid is 50m 3 ;

[0036] The main treatment solution is composed of the following components in weight percentage: 1.0% acetic acid, 2.0% hydrochloric acid, 1.0% hydrofluoric acid, 2.0% potassium chloride, 0.01% ammonium persulfate, 0.01% amphoteric fluorocarbon surfactant, and the remaining The amount is water; the water in the main treatment liquid is 90m 3 ;

[0037] The active plugging solu...

Embodiment 2

[0045] The composite plug-removing agent of this embodiment includes a pre-treatment liquid, a main treatment liquid, an active plug-removing liquid and a post-position liquid;

[0046] The pretreatment liquid is composed of the following components in weight percentage: 5.0% acetic acid, 5.0% hydrochloric acid, 5.0% hydrofluoric acid, 5.0% potassium chloride, 0.02% ammonium persulfate, 2.0% ethylenediaminetetraacetic acid, butyl Alkyne diol 1.0%, alkylphenol polyoxyethylene ether 0.2%, propylene glycol methyl ether 2.0%, the balance is water; the water in the pretreatment liquid is 35m 3 ;

[0047] The main treatment liquid is composed of the following components in weight percentage: 3.0% acetic acid, 5.0% hydrochloric acid, 2.0% hydrofluoric acid, 3.0% potassium chloride, 0.02% ammonium persulfate, 0.08% amphoteric fluorocarbon surfactant, and the remaining The amount is water; the water in the main treatment liquid is 80m 3 ;

[0048] The active plugging solution is com...

Embodiment 3

[0056] The composite plug-removing agent of this embodiment includes a pre-treatment liquid, a main treatment liquid, an active plug-removing liquid and a post-position liquid;

[0057] The pretreatment liquid is composed of the following components in weight percentage: 4.0% acetic acid, 4.0% hydrochloric acid, 4.0% hydrofluoric acid, 3.5% potassium chloride, 0.02% ammonium persulfate, 1.2% ethylenediaminetetraacetic acid, butyric acid 0.8% acetylene glycol, 0.2% alkylphenol polyoxyethylene ether, 1.2% propylene glycol methyl ether, and the balance is water; the water in the pretreatment liquid is 40m 3 ;

[0058] The main treatment solution is composed of the following components in weight percentage: 2.0% acetic acid, 3.5% hydrochloric acid, 1.5% hydrofluoric acid, 2.5% potassium chloride, 0.01% ammonium persulfate, 0.05% amphoteric fluorocarbon surfactant, and the remaining The amount is water; the water in the main treatment liquid is 85m 3 ;

[0059] The active blocka...

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Abstract

The invention discloses a composite blocking remover and a method for removing blockage of a compact sandstone reservoir pressing crack commissioning horizontal well in a composite manner. The composite blocking remover comprises a preposition liquid, a main treating fluid, an active blocking remover and a subsequent fluid. The preposition liquid is composed of organic acid, inorganic acid, a stabilizer, an oxidizing agent, a chelating agent, a corrosion inhibitor, polyol ether and water. The main treating fluid is composed of organic acid, inorganic acid, the stabilizer, the oxidizing agent, a fluorine carbon surfactant and water. The active blocking remover is composed of a zwitterionic surfactant, the stabilizer and water. The subsequent fluid is water. The composite blocking remover can remove the blockage of routine colloid, asphalt mass and inorganic solid phase particles, and can remove the damage of water blocking and crude oil emulsification by pertinency, and has the advantages of good slow performance, effectively preventing secondary deposition pollution such as the iron ion deposition and acid sludge generation, the horizontal well near-well and deep reservoir pollution can be effectively released, the oil well production power is recovered, and the recovery efficiency can be greatly increased.

Description

technical field [0001] The invention belongs to the technical field of oilfield exploitation, and in particular relates to a composite plugging-removing agent, and also relates to a composite plugging-removing method for fracturing and putting into production horizontal wells in tight sandstone reservoirs. Background technique [0002] Tight sandstone reservoirs are characterized by low permeability, narrow pore throats, and well-developed micro-fractures, and the drilling fluid is prone to leakage during drilling; when horizontal wells are put into production by staged fracturing, a large amount of liquid will inevitably enter the formation; , the reservoir is extremely vulnerable to damage from external incompatible fluids, and at the same time, due to the influence of temperature, pressure and other factors, it is easy to cause wax, colloid, and asphaltene to deposit near the wellbore, forming organic plugging; the well fluid contains a large amount of inorganic or Organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528C09K8/524E21B37/06
CPCC09K8/524C09K8/528C09K2208/32E21B37/06
Inventor 符伟兵李克智罗懿邓学峰刘岳龙魏开鹏梅洁卢瑜林
Owner CHINA PETROLEUM & CHEM CORP
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