Method for rapidly cleaning insoluble dirt in oil wells and oil reservoirs close to oil wells

An insoluble scale, oil well technology, applied in wellbore/well components, chemical instruments and methods, cleaning appliances, etc., can solve problems such as chemical incompatibility, oil well bore, ground blockage, production hazards, etc.

Inactive Publication Date: 2013-07-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the change of pressure, temperature and other series of factors in the process of oil recovery, as well as the thermodynamic instability and chemical incompatibility of formation water and injection water in secondary oil recovery, it often causes the wellbore and ground blockage of oil wells, which brings great impact on production. harm

Method used

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  • Method for rapidly cleaning insoluble dirt in oil wells and oil reservoirs close to oil wells
  • Method for rapidly cleaning insoluble dirt in oil wells and oil reservoirs close to oil wells
  • Method for rapidly cleaning insoluble dirt in oil wells and oil reservoirs close to oil wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Formula

[0027] Table 1 Embodiment 1 formula composition

[0028]

[0029] (2) Preparation method

[0030] Permeate (prepared 1000kg):

[0031] ①Add 670kg of distilled water to a container with a stirring device; ②Add 300kg of ethylene glycol monobutyl ether under constant stirring; ③Add 10kg of OP-10, and stir until it dissolves; ④Add 10kg of diisooctyl sodium sulfosuccinate Stir to dissolve evenly; ⑤Finally add 10kg of alpha olefin sulfonate and stir until the solution is uniform.

[0032] Spacer fluid (prepared 1000kg):

[0033] ①Prepare 984kg of hydrochloric acid with 12% weight concentration in the acid tank with stirring device; ②Add 5kg of dodecyl pyridinium bromide under constant stirring; ③Add 10kg of polyepoxysuccinic acid and stir until it dissolves; ④Add 1kg of cinnamaldehyde, stirring continuously until the cinnamaldehyde dissolves evenly.

[0034] Cleaning solution (prepared 1000kg):

[0035] ①Add 798kg of distilled water to a container with ...

Embodiment 2

[0037] (1) Formula

[0038] Table 2 embodiment 2 formula composition

[0039]

[0040] (2) Preparation method

[0041] Permeate (prepared 1000kg):

[0042] ①Add 555kg of distilled water to a container with a stirring device; ②Add 400kg of ethylene glycol monobutyl ether under continuous stirring; ③Add 15kg of OP-10 and stir until it dissolves; ④Add 15kg of diisooctyl sodium sulfosuccinate Stir to dissolve evenly; ⑤Finally add 15kg of alpha olefin sulfonate and stir until the solution is uniform.

[0043] Spacer fluid (prepared 1000kg):

[0044] ①Prepare 975kg of hydrochloric acid with a concentration of 12% by weight in an acid tank with a stirring device; ②Add 8kg of cetylpyridinium bromide under continuous stirring; ③Add 15kg of polyepoxysuccinic acid and stir until it dissolves; ④Add 2kg of cinnamaldehyde, stirring constantly, until the cinnamaldehyde dissolves evenly.

[0045] Cleaning solution (prepared 1000kg):

[0046] ①Add 697kg of distilled water to a contain...

Embodiment 3

[0048] (1) Formula

[0049] Table 3 Embodiment 3 formula composition

[0050]

[0051] (2) Preparation method

[0052] Permeate (prepared 1000kg):

[0053] ①Add 440kg of distilled water to a container with a stirring device; ②Add 500kg of ethylene glycol monobutyl ether under continuous stirring; ③Add 20kg of OP-10 and stir until it dissolves; ④Add 20kg of diisooctyl sodium sulfosuccinate Stir to dissolve evenly; ⑤Finally add 20kg of alpha olefin sulfonate and stir until the solution is uniform.

[0054] Spacer fluid (prepared 1000kg):

[0055] ①Prepare 968kg of hydrochloric acid with a concentration of 15% by weight in an acid tank with a stirring device; ②Add 10kg of cetylpyridinium chloride under continuous stirring; ③Add 20kg of polyepoxysuccinic acid and stir until it dissolves; ④Add 2kg of cinnamaldehyde, stirring constantly, until the cinnamaldehyde dissolves evenly.

[0056] Cleaning solution (prepared 1000kg):

[0057] ①Add 596kg of distilled water to a conta...

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PUM

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Abstract

The invention discloses a method for rapidly cleaning stubborn dirt in oil wells and oil reservoirs close to oil wells. The method includes injecting penetrating fluid, spacer fluid and cleaning fluid to the stratum sequentially, closing the well to react for 3-5 hours, and cleaning blockages of oil reservoirs. The penetrating fluid is composed of glycol ethers and various surface active agents and is capable of penetrating, loosing and stripping organic blockages rapidly; the spacer fluid is composed of acidic medium containing complexing agent and is capable of dissolving inorganic dirt of iron dirt, calcium dirt, mineral dirt and the like; and the cleaning fluid is composed of sulfate, hydrosulfite and oxalate, is capable of acting with the acidic spacer fluid to oxidize and decompose of organic blockages completely, and recovering and increasing oil reservoir penetrating rate. Production increase effect is good after the blockages are cleaned.

Description

technical field [0001] The invention relates to a method for quickly removing refractory scale blockages in oil wells and near-well oil layers, and belongs to the technical field of oil and gas layer stimulation operations. Background technique [0002] Due to the change of series factors such as pressure and temperature in the process of oil recovery, as well as the thermodynamic instability and chemical incompatibility of formation water and injection water in secondary oil recovery, it often causes oil well wellbore and ground blockage, which brings great impact on production. harm. The current research results show that there are two main types of oil reservoir plugging: inorganic scaling and organic fouling. Inorganic scaling mainly includes mineral scale, iron scale and CaCO3 scale. Mineral scale is mainly composed of Si and Al compounds formed by the migration of oil layer minerals; iron scale may be caused by the corrosion of oil production equipment by oilfield wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06C09K8/524C09K8/528
Inventor 汤勇陈红军卿凤方天成
Owner SOUTHWEST PETROLEUM UNIV
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