High-strength high-water-absorption degradable plugging agent and preparation method thereof

A high-water absorption and high-strength technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy residue accumulation, insufficient and incomplete, and the leakage plugging agent cannot self-degrade and degrade, so as to avoid gelation. Sticky wall, good effect, avoids the effect of solvation effect

Active Publication Date: 2020-11-20
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, especially the difficulty that the existing leak stoppage agent cannot degrade itself or the degradation is insufficient and

Method used

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  • High-strength high-water-absorption degradable plugging agent and preparation method thereof
  • High-strength high-water-absorption degradable plugging agent and preparation method thereof
  • High-strength high-water-absorption degradable plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A high-strength, high-water-absorbing and degradable leak-stopping agent A includes vinyl monomers, hydrophilic auxiliary agents, modified starches, crosslinking agents, initiators, inorganic reinforcing agents, degradation aids, and degradation activators. Based on the total weight of the plugging agent, the content of ethylenic monomer is 25%, the content of hydrophilic auxiliary agent is 15%, the content of modified starch is 30%, the content of crosslinking agent is 0.15%, and the content of initiator is 1.5%. The content of the inorganic reinforcing agent is 3 percent; the degradation aid is 0.03 percent of the mass of the modified starch, and the degradation activator is 0.003 percent of the mass of the degradation aid. Acrylamide and aminoethyl (meth)acrylate are selected as alkenyl monomers, the mass ratio of the two is 2:1, the hydrophilic auxiliary agent is methacrylic acid, the crosslinking agent is sodium p-styrenesulfonate, and the initiator is persulfuric a...

Embodiment 2

[0053] A high-strength, high-water-absorbing and degradable leak-stopping agent B includes vinyl monomers, hydrophilic auxiliary agents, modified starches, crosslinking agents, initiators, inorganic reinforcing agents, degradation aids, and degradation activators. Based on the total weight of the plugging agent, the content of ethylenic monomer is 25%, the content of hydrophilic auxiliary agent is 15%, the content of modified starch is 30%, the content of crosslinking agent is 0.15%, and the content of initiator is 1.5%. The content of the inorganic reinforcing agent is 4%; the degradation aid is 0.06% of the quality of the modified starch, and the degradation activator is 0.005% of the quality of the degradation aid; the ethylenic monomer is selected from acrylamide and aminoethyl (meth)acrylate, The two mass ratios are 2:1, the hydrophilic additive is methacrylic acid, the crosslinking agent is sodium p-styrene sulfonate, the initiator is ammonium persulfate / sodium bisulfite ...

Embodiment 3

[0060] A high-strength, high-water-absorbing and degradable leak-stopping agent C includes vinyl monomers, hydrophilic auxiliary agents, modified starches, crosslinking agents, initiators, inorganic reinforcing agents, degradation aids, and degradation activators. Based on the total weight of the plugging agent, the content of ethylenic monomer is 30%, the content of hydrophilic auxiliary agent is 18%, the content of modified starch is 35%, the content of crosslinking agent is 0.5%, and the content of initiator is 1.5%. , the content of the inorganic reinforcing agent is 3%; the degradation aid is 0.03% of the mass of the modified starch, and the degradation activator is 0.003% of the mass of the degradation aid; the alkenyl monomer is selected from acrylamide and (meth)aminoethyl acrylate , the mass ratio of the two is 2:1, the hydrophilic auxiliary agent is methacrylic acid, the crosslinking agent is sodium p-styrene sulfonate, the initiator is ammonium persulfate / sodium bisu...

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Abstract

The invention relates to a high-strength high-water-absorption degradable plugging agent and a preparation method thereof. The plugging agent is prepared from the following raw materials: an alkenyl monomer, a hydrophilic auxiliary agent, modified starch, a cross-linking agent, an initiator, an inorganic reinforcing agent, a degradation auxiliary agent and a degradation activator, wherein based onthe total mass of the raw materials, the content of the alkenyl monomer is 15-30%, the content of the hydrophilic additive is 10-30%, the content of the modified starch is 20-45%, the content of thecross-linking agent is 0.05-1.5%, the content of the initiator is 1.5-2%, and the content of the inorganic reinforcing agent is 2-5%. According to the invention, the high-strength high-water-absorption degradable plugging agent contains a plurality of hydrophilic groups, so that the plugging agent is high in water absorption rate and elasticity, is flexible gel, has deformability, can be squeezedinto a leakage channel to be compacted, is high in pressure bearing strength, contains high-temperature-resistant alpha-amylase, is subjected to degradation reaction at high temperature to destroy a plugging agent framework, is slowly liquefied, is free of residues and is free of pollution to stratums.

Description

technical field [0001] The invention relates to a high-strength, highly water-absorbing and degradable plugging agent and a preparation method thereof, belonging to the technical field of drilling fluid plugging in petroleum exploration and development. Background technique [0002] In the process of drilling, with the continuous advancement of oil and gas exploration and development projects, the formation conditions to be drilled and developed are becoming more and more complex, and the risk of downhole accidents is increasing. As a common and complicated downhole accident, lost circulation often leads to a lot of cost The operation time is too long, the loss of huge materials and drilling fluid may also cause a series of accidents such as blowout and well collapse. Complicated lost circulation is a difficult problem, and the plugging material used for drilling is an indispensable and important component in the leak prevention and plugging of drilling. The success rate of ...

Claims

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Application Information

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IPC IPC(8): C09K8/504C09K8/512
CPCC09K8/512C09K8/5045
Inventor 韩金良王玉斌白英睿苗强辛江杨干陈刚
Owner PETROCHINA CO LTD
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