Plugging removal liquid for plugging slurry and preparation method thereof

A technology for plugging slurry and plugging removal, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor plugging effect, inability to act as bridging and plugging substances, etc., and achieve strength weakening and shortening breakthroughs. The effect of reducing the time and structural stability of the filter cake

Active Publication Date: 2019-12-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The scavenging fluid provided by the related technology is aimed at the dissolution and removal of the drilling fluid filter cake, and cannot act on the bridging and plugging substances that exist in a large amount in the lost circulation slurry, and the plugging removal effect is poor

Method used

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Examples

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Effect test

preparation example Construction

[0068] In the second aspect, an embodiment of the present invention provides a method for preparing a plugging solution for lost circulation slurry. The preparation method is applied to any of the above-mentioned plugging solutions. The preparation method includes:

[0069] According to the mass percentage of each component, add a corrosion inhibitor and a corrosion inhibitor synergist to the hydrochloric acid, stir evenly, then add a blockage removing agent and an iron ion stabilizer, stir evenly, finally add water, stir evenly, and obtain a blockage removing solution.

[0070] The above preparation method is simple, can be prepared on site, and can also be prepared and carried to the site for use. The plug-removing fluid prepared by the preparation method has good plug-removal effect, does not cause damage to reservoirs, does not corrode pipelines or equipment, and can meet the use requirements of drilling operations.

[0071] When preparing the hydrochloric acid solution, t...

Embodiment 1

[0076] This embodiment provides a plugging solution, which is prepared by the following method: take 600mL of industrial hydrochloric acid with a mass percentage of 31% hydrogen chloride in a preparation vessel, add 20.0g of Mannich base and 5.0g of sodium pyroantimonate to the vessel , stir evenly, then add 50.0g glycolic acid, 10.0g sodium erythorbate, stir evenly, finally add water, stir evenly, and obtain 1000mL of the unblocking solution provided in this embodiment.

Embodiment 2

[0078] This embodiment provides a kind of blocking solution, which is prepared by the following method: take 600mL of industrial hydrochloric acid with a mass percentage of 31% hydrogen chloride in a preparation vessel, add 20.0g of Mannich base and 5.0g of formamide to the vessel, and stir Evenly, then add 80.0g 2,3-dihydroxypropionic acid, 5.0g nitrilotriacetic acid, 5.0g sodium erythorbate, stir evenly, finally add water, stir evenly, and obtain 1000mL of the unblocking solution provided in this example.

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PUM

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Abstract

The invention discloses a plugging removal liquid for plugging slurry and a preparation method thereof, belonging to the field of the oilfield chemistry. The plugging removal liquid for the plugging slurry comprises the following components in percentage by mass: 5.0%-8.0% of a plugging removal agent, 1.0%-2.0% of a corrosion inhibitor, 0.2%-0.5% of a corrosion inhibition synergist, 1.0%-2.0% of an iron ion stabilizer, and hydrochloric acid, with the balance being water, wherein hydrogen chloride in the hydrochloric acid accounts for 15.0%-20.0% of the mass percent of the plugging removal liquid, and the plugging removal agent contains two groups, namely hydroxyl and carboxyl groups. The plugging removal liquid is good in plugging removal effect, does not damage a reservoir, is free of corrosion to pipelines or equipment, and can meet the requirements of drilling operation.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a plugging removal fluid for lost circulation slurry and a preparation method thereof. Background technique [0002] Fractured reservoirs and karst reservoirs are prone to fractures, and drilling fluid loss is prone to occur during drilling. By injecting plugging slurry into the reservoir, the loss of drilling fluid can be reduced and controlled. The plugging slurry is composed of plugging materials matching the pore throats of the reservoir and potassium polysulfonate drilling fluid. The plugging materials are composed of walnut shells, peanut shells, ultrafine calcium carbonate, clay, cardboard chips, fibers, polymers, etc. The plugging material is composed of dense supramolecular complexes connected by ether bonds, ester bonds, and carbon-carbon bonds. There are many polar groups in the structure, forming strong intramolecular and intermolecular hydrogen bonds, which are diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 原励任宇刘友权王道成王川熊颖张燕
Owner PETROCHINA CO LTD
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