Self-expanding plugging agent

A technology of self-expanding and plugging agent, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as plugging of drilling fluid permeability and leakage, and achieve the effect of safe construction and easy operation.

CN110776887AActive Publication Date: 2020-02-11CNPC BOHAI DRILLING ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-02-11

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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.
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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...

Examples

Embodiment 1

[0031] 10 parts by weight of self-expanding plugging polymer particles, 10 parts by weight of coke particles, 5 parts by weight of corn stalk debris, 10 parts by weight of asbestos fibers, 20 parts by weight of calcium carbonate powder, 5 parts by weight of clam shells Chips and 10 parts by weight of sawdust; wherein,

[0032] The particle size of self-expanding polymer particles is 20-40 mesh, which is obtained by copolymerization of 30 parts by weight of acrylamide, 15 parts by weight of methyl acrylate, 10 parts by weight of potassium acrylate and 10 parts by weight of the fourth monomer Object (number average molecular weight is 8,000,000); The structural formula of the 4th monomer is: R1 is

[0033] Sawdust is made by mixing 10 parts by weight of sawdust with a particle size of 20-40 mesh, 20 parts by weight of sawdust with a particle size of 60-80 mesh, and 10 parts by weight of sawdust with a particle size of 100-120 mesh. The dried alkalized pine sawdust obtained ...

Embodiment 2

[0035] 15 parts by weight of self-expanding plugging polymer particles, 15 parts by weight of coke particles, 10 parts by weight of corn stalk debris, 5 parts by weight of asbestos fibers, 20 parts by weight of calcium carbonate powder, 10 parts by weight of clam shells Chips and 10 parts by weight of sawdust; wherein,

[0036] The particle size of the self-expanding polymer particles is 20-40 mesh, which consists of 35 parts by weight of acrylamide, 20 parts by weight of a mixture of methyl acrylate and butyl acrylate (the molar ratio of the two is 1:3), 5 parts by weight The mixture of potassium acrylate and acrylic acid (the molar ratio of the two is 1:5) and the copolymer obtained by copolymerization of the fourth monomer of 15 parts by weight (the number average molecular weight is 12 million); the structural formula of the fourth monomer is: Among them, R 2 for R 3 for

[0037] Sawdust is mixed by 5 parts by weight of sawdust with a particle size of 20-40 mesh, 1...

Embodiment 3

[0039] 15 parts by weight of self-expanding plugging polymer particles, 15 parts by weight of coke particles, 10 parts by weight of corn stalk debris, 10 parts by weight of asbestos fibers, 15 parts by weight of calcium carbonate powder, 10 parts by weight of clam shells Chips and 15 parts by weight of sawdust; wherein,

[0040] The particle size of the self-expanding polymer particles is 20-40 mesh, which consists of 35 parts by weight of acrylamide, 20 parts by weight of a mixture of methyl acrylate and butyl acrylate (the molar ratio of the two is 2:3), 5 parts by weight The mixture of potassium acrylate and acrylic acid (the molar ratio of the two is 1:1) and the copolymer obtained by copolymerization of the fourth monomer of 15 parts by weight (the number average molecular weight is 14 million); the structural formula of the fourth monomer is: Among them, R 2 for R 3 for

[0041] Sawdust is made by mixing 10 parts by weight of sawdust with a particle size of 20-40...