Degradable quick plugging agent

A plugging agent and fast technology, applied in the field of materials, can solve the problems of high working pressure, easy shrinkage, troublesome handling, etc., to achieve the effect of improving the success rate, good degradability, and easy plugging removal

Inactive Publication Date: 2013-11-27
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] All the rapid leak stoppage agents in the current market are powdery substances composed of hard block high-strength cement clinker, chemical admixtures, binders and various auxiliary materials. There are also some polyurethane substances. The disadvantage of this type of plugging agent is that it has certain hydrophobicity. Long-term use will destroy the reaction system, resulting in secondary water leakage and slow reaction speed, which is troublesome for post-processing.
And some inorganic gel material plugging technology, such as repeated extrusion cement plugging method, this is a conventional main repair method, used very early, plugging agent is cheap, stro

Method used

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Examples

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example 1

[0054] (2) Dissolve carboxymethyl cellulose sodium salt in 60 mL of distilled water first, then add acrylamide, stir to dissolve it, put it in a 40°C water bath and heat for about half an hour to mix the two evenly. Add the initiator ammonium persulfate and stir evenly, control the pH to about 7, and react for 8-9 hours. The cross-linking reaction can be stopped when the glass rod is dipped to draw a wire length of about 10 cm.

[0055] (3) Cool the cross-linked product solution as the base liquid A, which can be put into practical use for plugging. At the same time, the base liquid A can also be heated and dried to become powder, which is convenient for storage and transportation. It can be prepared with distilled water on site when used. It is prepared and used immediately, and the viscosity of the base liquid can be adjusted according to the amount of water. This example directly uses the base liquid A solution just prepared

[0056] 2. Preparation of inorganic crosslinki...

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Abstract

The invention relates to a degradable quick plugging agent. The degradable quick plugging agent is composed of three parts, wherein a base solution A is prepared by graft copolymerization of sodium carboxymethylcellulose and acrylamide; a cross-linking agent B is composed of inorganic cross-linking agents CrCl3, FeCl2 and borax; and a base solution C is a gel breaker with a degradation action and composed of H2O2 and NaOH solution. Due to a solid hydrogel generated by the reaction between the base solution A and the cross-linking agent B, the swelling property and retention property of a plugging slurry are enhanced, the success rate of plugging is increased, and the repeatability of plugging is reduced. The plugging agent has high hardness in a working state and can be applied to high-pressure places; when plugging is not needed any more, the gel breaker base solution C can permeate in a plugging gel, and a plugging main body, namely the solid hydrogel, can be decomposed and broken in a period of time and is removed further.

Description

technical field [0001] The present invention belongs to the field of materials. In particular, it relates to a degradable rapid leakage plugging agent. Background technique [0002] All the rapid plugging agents in the current market are powdery substances composed of hard block high-strength cement clinker, chemical admixtures, binders and various auxiliary materials, and some are polyurethane substances. The disadvantage is that it has a certain degree of hydrophobicity, and long-term use will destroy the reaction system, causing secondary water leakage, slow reaction speed, and troublesome post-processing. And some inorganic gel material plugging technologies, such as repeated extrusion cement plugging method, this is a conventional main repair method, used very early, plugging agent is cheap, strong, and can be applied to various temperatures, so far It is still widely used, but it is also a difficult restoration technique. This technology has the following problems: ...

Claims

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Application Information

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IPC IPC(8): C09K8/44
Inventor 李东平李海东丁为民
Owner HARBIN UNIV OF SCI & TECH
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