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A kind of multiple non-covalent bond synergistic self-healing gel plugging agent and its preparation and application

A technology of non-covalent bonding and gelation, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of plugging material formula and preparation process complex, weak pressure bearing capacity, low applicable temperature, etc. Achieve good healing effect, strong pressure bearing capacity and high applicable temperature

Active Publication Date: 2021-11-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies of the existing conventional gel leakage prevention / plugging agents, especially the defects of the existing plugging material formula and preparation process, weak pressure bearing capacity and low applicable temperature, the first purpose of the present invention is to provide a non-toxic Covalent bond synergistic self-healing gel plugging agent

Method used

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  • A kind of multiple non-covalent bond synergistic self-healing gel plugging agent and its preparation and application
  • A kind of multiple non-covalent bond synergistic self-healing gel plugging agent and its preparation and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0066] A non-covalent bond synergistic self-healing plug, including 27 parts by weight of the raw material, 27 parts of the first copolymerized reaction monomer, 23 parts of the second copolymerizer, 3 surfactants, 0.2 initiator 2.4 parts of the first crosslinking agent, 2.8 parts of the second crosslinking agent, 0.15 parts of the promoter, 41.45 parts of a sodium chloride solution of 0.9 mol / L.

[0067] Among them, the first copolymerization monomer is a combination of xanthan gum and chitosan, which is a mass ratio of xanthan gum and chitosan is 3: 1; hydrophilic monomer in the second copolymerized monomer is acrylamide. The hydrophobic monomer is a stearate of methacrylate, the mass ratio of hydrophilic monomer and the hydrophobic monomer is 12: 1; the surfactant uses sodium sulfate sulfate; the initiator is selected from potassium sulfate; The combination of the calcium sulfate and the mexyphenol of dihydrate, the mass ratio of calcium sulfate and the amphidenphenol is 2: 1...

Embodiment 2

[0076] A non-covalent bond synergistic healing gel plug, including 26 parts by weight of the raw material, 1000 copolymerized monomer, 17 parts of the second copolymerizer, 1 surfactant, 0.2 initiator 2.3 parts of the first crosslinking agent, 2.3 parts of the second crosslinking agent, 0.17 parts of the promoter, 51.03 parts of the aqueous solution of 0.9 mol / L of the sodium chloride solution.

[0077] Among them, the first copolymerization monomer is a combination of sodium alginate and xanthan gum, which is a mass ratio of sodium alginate and xanthan gum is 1: 2; the hydrophilic monomer in the second copolymerized monomer is acrylamide. Combination with methacrylic acid, the mass ratio of acrylamide and methacrylic acid is 1: 1, the hydrophobic monomer is a stearate of methacrylate, the mass ratio of hydrophilic monomer and the hydrophobic monomer is 13: 1; surface The active agent uses sodium dodecyl benzene sulfonate; the initiator uses ammonium sulfate; the first crosslink...

Embodiment 3

[0080] A non-covalent bond synergistic healing gel plug, including 26 parts by weight of the raw material, 1000 copolymerized monomer, 17 parts of the second copolymerizer, 1 surfactant, 0.2 initiator 2.3 parts of the first crosslinking agent, 2.3 parts of the second crosslinking agent, 0.17 parts of the promoter, 51.03 parts of the aqueous solution of 0.9 mol / L of the sodium chloride solution.

[0081] Among them, the first copolymerization monomer is a combination of sodium alginate and xanthan gum, which is a mass ratio of sodium alginate and xanthan gum is 1: 2; the hydrophilic monomer in the second copolymerized monomer is acrylamide. With the combination of methacrylic acid, the mass ratio of acrylamide and methacrylic acid is 1: 1.5, the hydrophobic monomer is a hexadalkyl acrylate, the mass ratio of hydrophilic monomer and the hydrophobic monomer is 11: 1; Surfactants are used in dodecyl sulfate; the initiator is selected from potassium sulfate; the first cross-sulfate i...

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Abstract

The invention relates to a multiple non-covalent bond synergistic self-healing gel plugging agent and its preparation and application, belonging to the technical field of drilling fluid leakage prevention and plugging; it includes the following raw materials in parts by weight: the first copolymerization reaction monomer 15 -30 parts, 12-35 parts of the second comonomer, 0.3-7 parts of surfactant, 0.01-1 part of initiator, 0.5-4 parts of the first crosslinking agent, 1-4 parts of the second crosslinking agent, Accelerator 0.05-0.3 part, balance is sodium chloride aqueous solution, the sum of above each raw material is 100. The present invention is based on double non-covalent bonds prepared by two-step polymerization, relying on ionic bonds to form a weak network at the target layer to quickly achieve initial healing, and then forming a strong network based on hydrophobic association reactions based on the weak network of ionic bonds, thus forming The energy dissipation mechanism based on the strong / weak network ensures good mechanical strength, and the self-healing gel with multiple non-covalent networks has a better healing effect than covalent bonds.

Description

Technical field [0001] The present invention relates to a multiple non-covalent cooperative self-healing gel preparation and application of sealing agent, belonging to the technical field plugging while drilling. [0002] technical background [0003] Whether in drilling on land or sea, the lost circulation are among the most common and difficult to manage complex engineering accident. During drilling, when the fractured drilled, when the sewing holes prone to leakage and poor crush resistance and cement formation, the ocean deepwater drilling and during drilling, require long and large inner diameter of the riser, need to open by pressure pump to carry rock drilling, well leak-prone, but because of deep-water drilling "breathing effect", well leakage is difficult to find early, to be well leakage strengthen even lead to flooding blowout brought huge losses. Suitable leakproof / dropout prevention and treatment plugging material may occur, the polymer gel is one of the most common...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/06C08F220/18C09K8/035C09K8/42
CPCC08F251/00C09K8/035C09K8/426C08F220/56C08F220/1818C08F220/06
Inventor 白英睿张启涛孙金声吕开河韩金良李公让曹立虎李双贵姚如刚耿雷陈军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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