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Oilfield plugging remover and preparation method thereof

A plug-removing agent and oilfield technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as ineffectiveness, oil production decline, explosion, etc., to improve plugging removal efficiency, prolong action time, The effect of increasing oil production

Active Publication Date: 2021-06-01
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional plugging removal method in oilfields is "acidification and plugging removal". Acidification is the main process for downhole operation of oil and water wells in oilfields to solve plugging problems. Biological bacteria clusters, metal corrosion products, and high molecular polymers have poor corrosion resistance, or even do not work, which leads to poor plugging removal effect, can not dredge the oil production channels of oil and water wells, and ultimately leads to a decline in oil production
[0004] Chlorine dioxide has the performance of a strong oxidant, and can quickly degrade the corrosion products of high molecular polymers, biological bacteria groups and metals. Because chlorine dioxide has the above excellent characteristics, it has attracted attention in this field. However, because chlorine dioxide itself is easy to decompose Instability, the danger of explosion due to gas overflow, and the defects that are easy to cause damage to the human respiratory system have greatly restricted the application of chlorine dioxide in plugging removers, resulting in the fact that chlorine dioxide has not been able to be applied to the actual oil production site

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Plugging remover for oilfields, which includes a pre-fluid, a main body fluid and a post-fluid with a mass ratio of 1:4:1; wherein,

[0036] The pre-fluid includes 25wt.% of hydrochloric acid, 1wt.% of ethylenediene triamine pentaacetate, 1wt.% of dodecyl dimethyl betaine, 1wt.% of hydroxyethylidene diphosphonic acid, and 1wt.% of polyacrylamide .%, corrosion inhibitor 0.4wt.%, the balance is water;

[0037] The body liquid includes 10wt.% of paraformaldehyde, 15wt.% of ammonium chloride, 10wt.% of ammonium chloroacetate, 0.4wt.% of ethylene glycol butyl ether, 1wt.% of dodecyl dimethyl betaine, amino 1wt.% of triacetic acid, 1wt.% of polyacrylamide, 0.3wt.% of penetrant, 0.4wt.% of corrosion inhibitor, and the balance is water;

[0038] The post liquid includes oxidant 15wt.%, hydroxytriacetic acid 1wt.%, sodium hypochlorite 1wt.%, ethylene glycol butyl ether 0.1wt.%, penetrant 0.3wt.%, corrosion inhibitor 0.4wt.%, the balance Be water; Described oxygenant comprises ...

Embodiment 2

[0053] Plugging remover for oilfields, which includes a pre-fluid, a main body fluid and a post-fluid with a mass ratio of 1:4:1; wherein,

[0054] The pre-fluid includes 20wt.% of hydrochloric acid, 0.5wt.% of ethylenediene triamine pentaacetate, 0.5wt.% of dodecyl dimethyl betaine, 0.5wt.% of hydroxyethylidene diphosphonic acid, poly Acrylamide 0.5wt.%, corrosion inhibitor 0.3wt.%, the balance is water;

[0055] The body liquid includes 8wt.% of paraformaldehyde, 10wt.% of ammonium chloride, 8wt.% of ammonium chloroacetate, 0.3wt.% of ethylene glycol butyl ether, 0.5wt.% of dodecyl dimethyl betaine, Aminotriacetic acid 0.5wt.%, polyacrylamide 0.5wt.%, penetrant 0.2wt.%, corrosion inhibitor 0.3wt.%, the balance is water;

[0056] The post liquid includes oxidant 10wt.%, hydroxytriacetic acid 0.5wt.%, sodium hypochlorite 0.5wt.%, ethylene glycol butyl ether 0.1wt.%, penetrant 0.2wt.%, corrosion inhibitor 0.3wt.%, Surplus is water; Described oxygenant comprises sodium chlorit...

Embodiment 3

[0071] Plugging remover for oilfields, which includes a pre-fluid, a main body fluid and a post-fluid with a mass ratio of 1:4:1; wherein,

[0072] The pre-fluid includes 30wt.% of hydrochloric acid, 1.5wt.% of ethylenedienetriaminepentaacetate, 1.5wt.% of dodecyl dimethyl betaine, 1.5wt.% of hydroxyethylidene diphosphonic acid, poly Acrylamide 1.5wt.%, corrosion inhibitor 0.5wt.%, the balance is water;

[0073]The body liquid includes 12wt.% of paraformaldehyde, 20wt.% of ammonium chloride, 12wt.% of ammonium chloroacetate, 0.5wt.% of butyl glycol ether, 1.5wt.% of dodecyl dimethyl betaine, Aminotriacetic acid 1.5wt.%, polyacrylamide 1.5wt.%, penetrant 0.4wt.%, corrosion inhibitor 0.5wt.%, the balance is water;

[0074] The post liquid includes oxidant 20wt.%, hydroxytriacetic acid 1.5wt.%, sodium hypochlorite 1.5wt.%, ethylene glycol butyl ether 0.1wt.%, penetrant 0.4wt.%, corrosion inhibitor 0.5wt.%, Surplus is water; Described oxygenant comprises sodium chlorite, tartari...

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PUM

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Abstract

The invention discloses a blockage removing agent for oilfields and a preparation method thereof, which comprises a pre-fluid, a main body fluid and a post-fluid with a mass ratio of 1:4:1; wherein, the pre-fluid includes hydrochloric acid, ethylene glycol Triaminepentaacetic acid amine, dodecyl dimethyl betaine, hydroxyethylidene diphosphonic acid, polyacrylamide, corrosion inhibitor, and the balance is water; the main liquid includes paraformaldehyde, ammonium chloride, Ammonium chloroacetate, ethylene glycol butyl ether, dodecyl dimethyl betaine, aminotriacetic acid, polyacrylamide, penetrating agent, corrosion inhibitor, and the balance is water; Acetic acid, sodium hypochlorite, butyl glycol ether, penetrating agent, corrosion inhibitor, and the balance is water. The present invention adopts the combination of acid + authigenic acid + oxidizing agent +, which can thoroughly degrade inorganic substances, biological bacteria clusters, metal corrosion products and high molecular polymers one by one, and then completely remove blockages in oil and water wells, achieving significant improvement The purpose of oil production.

Description

technical field [0001] The invention relates to the technical field of oilfield additives. More specifically, the present invention relates to an oil field plugging remover and a preparation method thereof. Background technique [0002] One of the core links in the oil extraction process is to keep the oil and water wells unblocked. However, in the process of drilling, cementing, fracturing and acidizing, and water injection, a large amount of substances will be produced to block the oil and water wells, which will lead to rapid oil and gas production. Substances that cause blockage of oil and water wells can be mainly divided into the following categories: a. Inorganic salts in foreign fluids in the process of drilling, cementing, production and workover; b. Bacteria in formations and fluids Bacterial clusters formed by breeding; c. Metal corrosion products caused by microbial bacteria corrosion of steel; d. Various polymers brought in by foreign fluids during drilling, ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 陈邦陈琰
Owner NORTHWEST UNIV
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