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A Gradual Injection Deep Plugging Relief Agent and Its Injection Technology

A plugging agent and deep-seated technology, applied in wellbore/well components, cleaning tools, drilling compositions, etc., can solve the problems of high cost of plugging projects, environmental pollution, high pressure of water injection wells, etc., and achieve a plugging radius big effect

Active Publication Date: 2015-11-04
大庆宇涵井下作业技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used blocking agents for water injection wells include hydrochloric acid, earth acid, micellar acid, emulsified acid, foam acid, etc. The plugging removal process is to inject the plugging agent into the water injection layer at one time, which has the following disadvantages: 1) The swept area is small : One-time injection of plugging agent, generally the maximum injection volume is 15m 3 Left and right, the volume of plugging remover is limited, so the void volume of the water injection layer involved is limited; 2) The plugging removal radius is difficult to break through the distance of 1.5m: due to the high concentration of plugging removal agent and the characteristics of the composition of plugging removal agent, it is not compatible with water injection When in contact with rock formations, the reaction speed with carbonates, iron salts and silicates on the surface of the rock formation is fast, and a large amount of plugging removal agent is consumed in the water injection layer less than 1m, resulting in a very limited radius of plugging removal, and it is difficult to break through 1.5m 3) High operating cost: inspection of water injection wells is required before plugging removal construction; 4) High equipment requirements and high cost of plugging removal project: due to the large amount of plugging removal agent injected at one time, injection Water wells generally have high pressure, and the liquid absorption speed is very limited. Therefore, high-pressure cement trucks are required, and at the same time, clean water tank trucks and liquid distribution tanks are required. ;5) For water injection wells without return water pipelines, a large number of tank trucks are required to transport the flowback residual liquid, and waste will be discharged into the air during the flowback process, causing environmental pollution; 6) The injection of foam deblocking agent is still subject to pressure 7) In the process of plugging removal construction and residual liquid flowback, the water injection well must be shut down, which will affect the water injection volume of the water injection well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The plug-removing agent of this embodiment is composed of A formulation, B formulation and C formulation in a volume ratio of 1:1.3:1.55.

[0020] Among them, the composition of agent A: glycerol content 11%, Span-20 content 5%, Tween-80 content 3%, ethylene glycol monobutyl ether 10%, lactobellin content 1%, OS-20 content 0.5% , HCL content 12%, HF content 3%, ammonium thiocyanate content 0.5%, cyanoacetic acid content 3%, imidazoline epoxy vinyl ether content 0.5%, pyridine benzyl chloride quaternary ammonium salt content 0.5%, propynyl alcohol content 0.1%, the balance is clear water;

[0021] Among them, the composition of agent B: HCL content 8%, HF content 2%, citric acid content 3%, salicylic acid content 5%, glutaric acid content 2%, quinoline iodide benzyl quaternary ammonium salt content 0.6%, butyne Glycol content 0.5%, OP-9 content 2%, salt-free oleic acid imidazoline content 1.5%, Tween-80 content 6%, ethylene glycol monobutyl ether 5%, milk spirit content...

Embodiment 2

[0027] The plug-removing agent in this embodiment is composed of A formulation, B formulation and C formulation in a volume ratio of 1:1.5:1.9.

[0028] Among them, the composition of agent A: glycerol content 6%, Span-20 content 12%, Tween-80 content 6%, ethylene glycol monobutyl ether 3%, OS-20 content 1.0%, HCL content 13%, The content of HF is 2%, the content of ammonium thiocyanate is 1%, the content of cyanoacetic acid is 2%, the content of imidazoline epoxy vinyl ether is 0.6%, the content of pyridine benzyl chloride quaternary ammonium salt is 0.7%, the content of propynyl alcohol is 0.15%, and the balance is Composition of clear water.

[0029] Among them, the composition of agent B: HCL content 10%, citric acid content 2%, salicylic acid content 4%, quinoline iodide benzyl quaternary ammonium salt content 1.0%, butynediol content 0.7%, OP-9 content 3% , Salt-free oleic acid imidazoline content 1.0%, Tween-80 content 12%, ethylene glycol monobutyl ether 7%, lactobell...

Embodiment 3

[0035] The plug-removing agent of this embodiment is composed of A formulation, B formulation and C formulation in a volume ratio of 1:1.3:1.5.

[0036] Among them, the composition of agent A: glycerol content 6%, Span-20 content 7%, Tween-80 content 5%, ethylene glycol monobutyl ether 7%, lactobellin content 1.5%, OS-20 content 1.0% , HCL content 15%, HF content 4%, ammonium thiocyanate content 1%, cyanoacetic acid content 2%, imidazoline epoxy vinyl ether content 0.7%, pyridine benzyl chloride quaternary ammonium salt content 1.0%, propynyl alcohol content 0.2%, and the balance is clear water.

[0037] Among them, the composition of agent B: HCL content 6%, HF content 2%, citric acid content 5%, salicylic acid content 4%, glutaric acid content 3%, quinoline iodide benzyl quaternary ammonium salt content 0.8%, butyne Glycol content 0.6%, OP-9 content 1.5%, salt-free oleic acid imidazoline content 2.0%, Tween-80 content 8%, ethylene glycol monobutyl ether 6%, lactobellin cont...

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PUM

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Abstract

A gradual injection oil layer deep part blocking remover and an injection technology thereof are disclosed. The blocking-remover is composed of an A agent formula, a B agent formula, and a C agent formula. The injection technology comprises the following steps: in a condition that the water injection well is not stopped, orderly and step-by-step adding the A agent formula, the B agent formula, and the C agent formula with designed concentrations into water, and then adding the A agent formula, the B agent formula, and the C agent formula with injection water into the water injection layer of a water injection well. The injection technology provided by the invention injects the blocking remover with an amount matching with the water injection amount of the water injection well in a multi-sectional mode according to the different functions and properties of the blocking remover, carries out blocking removing and injection increasing operations on the water injection well in the condition that the water injection well keeps on working, furthermore blocking remover flowback is not needed after the construction is finished. The gradual-injection blocking remover and the injection technology thereof have the characteristics that: the blockings in the deep part of the ground can be removed, the blocking removing radius is large, the water injection production is not affected at the same time, the blocking remover and the injection technology have no flowback pollution and the pollutant processing cost brought by blocking remover flowback is saved.

Description

technical field [0001] The invention relates to a deep plugging removal process for water injection wells, in particular to a gradual injection type oil layer deep plugging removal agent and an injection process, which are used to remove the deposits in the fluid of the water injection layer of the oil field 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] In the process of drilling, fracturing, operation and production, the water injection layer of the oilfield water injection well will be blocked by sediments in the fluid, blocked by fluid scaling, and blocked by bacterial reproduction. Blockage leads to a decrease in the conductivity of the water injection layer of the injection well, resulting in a decrease in oil field production and economic benefits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/524C09K8/528E21B37/06
CPCC09K8/52C09K8/524C09K8/528E21B37/06
Inventor 王香增郭学辉杜素珍陶红胜李国明俞忠宝白李余海棠李磊
Owner 大庆宇涵井下作业技术服务有限公司
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