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A kind of oil well, water injection well double-effect plugging removal agent and using method thereof

A water injection well and plugging removal agent technology, applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems of secondary pollution plugging, short validity period, poor plugging removal effect, etc., and achieve plugging removal High success rate and long effective period of plugging removal

Active Publication Date: 2017-10-24
DAQING BEIHUA CHEM PLANT
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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 dual-effect plugging remover for oil wells and water injection wells, which solves the problems of poor plugging removal effect, short validity period or secondary pollution plugging of existing conventional plugging removers on formation plugging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The plug-removing agent of this embodiment is used in water injection wells, and consists of agent A formula, agent B formula and agent C formula in a volume ratio of 1:2.5:2.

[0024] Among them, agent A is composed of formula, and the mass concentration is: 2.0% of fluorocarbon surfactant, 1.0% of sodium alkylbenzene sulfonate, 1.0% of Tween 80, 0.5% of polyoxyethylene alkanolamide, and 0.5% of polyoxyethylene alkylamide , the total mass concentration is 5%, and the balance is clear water.

[0025] Among them, agent B is composed of formula, the mass concentration is: hydrochloric acid 2.0%, hydrofluoric acid 1.0%, formic acid 2.0%, ammonium fluoride 1.0%, phosphoric acid 1.0%, fluoroboric acid 0.5%, octadecylpyridinium bromide (OPB) 1.0 %, polyvinyl alcohol 1.0%, chlorine dioxide 1.0%, acetic acid 0.5%, the total mass concentration is 11%, and the balance is clear water.

[0026] The formulation of agent C is composed of the following mass concentrations: 5.0% ammon...

Embodiment 2

[0032] The plug-removing agent of this embodiment is used in water injection wells and consists of agent A formula, agent B formula and agent C formula in a volume ratio of 1.5:3:2.

[0033] Among them, agent A is composed of formula, and the mass concentration is: 2.5% of fluorocarbon surfactant, 2.0% of sodium alkylbenzene sulfonate, 2.0% of Tween 80, 1.0% of polyoxyethylene alkanolamide, and 1.0% of polyoxyethylene alkylamide , the total mass concentration is 8.5%, and the balance is clear water.

[0034] Among them, agent B is composed of formula, the mass concentration is: hydrochloric acid 5.0%, hydrofluoric acid 1.5%, formic acid 1.5%, ammonium fluoride 1.6%, phosphoric acid 1.7%, fluoroboric acid 0.7%, octadecylpyridinium bromide (OPB) 2.0 %, polyvinyl alcohol 1.5%, chlorine dioxide 1.5%, acetic acid 1.0%, the total mass concentration is 18%, and the balance is clear water.

[0035] The formulation of agent C is composed of the following mass concentrations: 6.0% ammo...

Embodiment 3

[0041] The plug-removing agent of this embodiment is used in oil wells and consists of agent A formula, agent B formula and agent C formula in a volume ratio of 1:1:1.

[0042] Among them, agent A is composed of formula, and the mass concentration is: 3.0% of fluorocarbon surfactant, 3.0% of sodium alkylbenzene sulfonate, 2.5% of Tween 80, 1.7% of polyoxyethylene alkanolamide, and 1.8% of polyoxyethylene alkylamide , the total mass concentration is 12%, and the balance is clear water.

[0043] Among them, agent B is composed of formula, mass concentration is: hydrochloric acid 8.0%, hydrofluoric acid 2.5%, formic acid 2.8%, ammonium fluoride 1.7%, phosphoric acid 2.5%, fluoroboric acid 0.8%, octadecylpyridinium bromide (OPB) 2.5% %, polyvinyl alcohol 1.8%, chlorine dioxide 1.2%, acetic acid 1.2%, the total mass concentration is 25%, and the balance is clear water.

[0044] The formulation of agent C is composed of the following mass concentrations: 8.0% ammonium chloride, 8.0...

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Abstract

The invention discloses a dual-effect blocking remover for an oil well / water injection well as well as a using method thereof. The dual-effect blocking remover comprises A agent ingredient, B agent ingredient and C agent ingredient, and the respective ingredients have respective emphasized blocking removing types, and have complementary and synergistic effects, wherein the A agent ingredient is prepared from a high-activity surfactant, and is used for removing organics-based blocking in an oil / water well, so as to increase physical flowability of crude oil; the B agent ingredient is prepared from an acidic chemical agent, and is used for removing inorganics-based blocking in the oil / water well, so as to expand a flow channel and increase permeability; the C agent ingredient is prepared from a neutralization initiator, and is used for neutralizing residual acid, so as to facilitate the flowback of the residual acid and residual slag, and therefore to prevent secondary pollution-based blocking, prolong the validity period of blocking removal, and increase the success rate of the blocking removal. Different using methods are selected based on different wells. According to the dual-effect blocking remover disclosed by the invention, the blocking caused by both organics and inorganics present in the oil well / water injection well can be removed at one time, blocking substances are corroded into a powdery form, the residual and residual liquid are completely discharged out of a wellbore when a well is cleaned, and the dual-effect blocking remover disclosed by the invention has the characteristics of high blocking removal success rate and long validity time of the blocking removal.

Description

technical field [0001] The present invention relates to the technical field of potential tapping of old wells in oil fields, in particular to a double-effect plugging remover for oil wells and water injection wells and its use method, which is used to remove the clogging of organic substances and inorganic substances that exist simultaneously in oil wells and water injection wells, and solves the current problem. There are problems that conventional plugging removers have poor plugging removal effect on formation plugging, short validity period or secondary pollution plugging. Background technique [0002] The reasons for clogging of the oil layer of the oil well and the water injection layer of the water injection well are divided into two categories. One is inorganic substances, which will be blocked by solid particles, rock debris, iron oxide, soil cement, etc. during the drilling process, production process, measure process, and workover process; the other is organic sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52E21B37/06
CPCC09K8/52E21B37/06
Inventor 贾珍白鹏王梅梅夏世河乔丹崔砚英贾丽娟杜浩贾民
Owner DAQING BEIHUA CHEM PLANT