Self-expanding plugging agent

Abstract

The invention discloses a self-expanding plugging agent which comprises the following components in parts by weight: 10-15 parts of self-expanding plugging polymer particles, 10-15 parts of sawdust, 5-10 parts of corn straw debris, 5-10 parts of asbestos fiber, 15-20 parts of calcium carbonate powder, 10-20 parts of coke particles and 5-10 parts of clam shell debris, wherein the self-expanding plugging polymer particles are a copolymer which is composed of a first monomer, a second monomer, a third monomer and a fourth monomer through copolymerization and has a number-average molecular weightof 8-14 million; the first monomer is acrylamide; the second monomer is at least one of methyl acrylate and butyl acrylate; the third monomer is at least one of potassium acrylate, sodium acrylate andacrylate; and the fourth monomer is a monomer containing double bonds. The self-expanding plugging agent is formed by multiple plugging support materials with different particle sizes and self-expanding polymer particles through mixing, meets filling of cracks and pores with different types of crack sizes of 1-5mm, and in addition, is simple in in-situ grouting, easy to operate and safe in construction.

Description

technical field [0001] The invention relates to the technical field of drilling plugging technology, in particular to a self-expanding plugging agent. Background technique [0002] With the deepening of oil and gas exploration and development, when drilling wells with complex structures, deep wells, fractured formations, faults, fractured formations, high-permeability sandstone formations or conglomerate formations, and old oil areas, the geological factors, geological factors, etc. Influenced by factors such as stress factors and long-term injection-production factors, the original pressure system of the formation is destroyed. When the formation pressure is depleted, the problem of lost circulation is very prominent. [0003] The main areas of drilling operations caused by the above factors all exist or occur, with different forms and degrees of leakage, including the bottom formation loss of the sandstone Guantao Formation, the formation loss of the Dongying Formation and...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an effective solution to the current problem that the drilling fluid permeability loss that occurs during the drilling process is not easy to be blocked when drilling into high-permeability sandstone or conglomerate oil-gas reservoir formations, pore-type, fracture-type oil-gas reservoir formations, etc. , and invented a self-expanding plugging agent

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