Non-covalent bond synergistic self-healing gel plugging agent as well as preparation method and application thereof

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

Active Publication Date: 2021-10-15
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

Method used

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  • Non-covalent bond synergistic self-healing gel plugging agent as well as preparation method and application thereof
  • Non-covalent bond synergistic self-healing gel plugging agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A non-covalent cooperative self-healing gel sealing agent, comprising the following parts by weight of the material, the first co-reactive monomer 27 parts, 23 parts of a second copolymerizable reactive monomer, 3 parts of a surfactant, 0.2 parts of initiator , 2.4 parts by first crosslinking agent, second crosslinking agent 2.8 parts, 0.15 parts of accelerators, 41.45 parts of a concentration of 0.9mol / L aqueous sodium chloride solution.

[0067] Wherein the first monomer is a copolymerization composition of xanthan gum and chitosan as a mass ratio of xanthan gum and chitosan is 3: 1; second hydrophilic monomer in the copolymerization of acrylamide monomer hydrophobic monomers are esters of methacrylic acid, the mass ratio of the hydrophilic monomer and hydrophobic monomer is 12: 1; a surfactant selected lauryl sulfate; potassium persulfate initiator selected; a first post linking agent is calcium sulfate dihydrate and a combination of resorcinol, and the mass ratio of c...

Embodiment 2

[0076] A non-covalent cooperative self-healing gel sealing agent, comprising the following parts by weight of the material, the first co-reactive monomer 26 parts, 17 parts of a second copolymerizable reactive monomer, 1 part of a surfactant, 0.2 parts of initiator , 2.3 parts by first crosslinking agent, second crosslinking agent 2.3 parts, 0.17 parts of accelerators, 51.03 parts of a concentration of 0.9mol / L aqueous sodium chloride solution.

[0077] Wherein the first monomer is a copolymerization composition of sodium alginate and xanthan gum, sodium alginate and the mass ratio of xanthan gum is 1: 2; the second hydrophilic monomer in the copolymerization of acrylamide monomer and a combination of methacrylic acid, acrylamide and methacrylic acid mass ratio of 1: 1, the hydrophobic monomer is stearyl methacrylate, mass ratio of the hydrophilic monomer to hydrophobic monomer was 13: 1; surface active agent is selected dodecylbenzenesulfonate; selection initiator ammonium pers...

Embodiment 3

[0080] A non-covalent cooperative self-healing gel sealing agent, comprising the following parts by weight of the material, the first co-reactive monomer 26 parts, 17 parts of a second copolymerizable reactive monomer, 1 part of a surfactant, 0.2 parts of initiator , 2.3 parts by first crosslinking agent, second crosslinking agent 2.3 parts, 0.17 parts of accelerators, 51.03 parts of a concentration of 0.9mol / L aqueous sodium chloride solution.

[0081] Wherein the first monomer is a copolymerization composition of sodium alginate and xanthan gum, sodium alginate and the mass ratio of xanthan gum is 1: 2; the second hydrophilic monomer in the copolymerization of acrylamide monomer in combination with methacrylic acid, acrylamide and methacrylic acid mass ratio of 1: 1.5, the hydrophobic monomer is cetyl methacrylate, a hydrophobic monomer and hydrophilic monomer mass ratio of 11: 1; a surfactant selected lauryl sulfate; potassium persulfate initiator selected; ratio of the first...

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Abstract

The invention relates to a non-covalent-bond synergistic self-healing gel plugging agent as well as a preparation method and application thereof, and belongs to the technical field of leakage prevention and plugging of drilling fluid. The plugging agent comprises the following raw materials in parts by weight: 15-30 parts of a first copolymerization reaction monomer, 12-35 parts of a second copolymerization reaction monomer, 0.3-7 parts of a surfactant, 0.01-1 part of an initiator, 0.5-4 parts of a first cross-linking agent, 1-4 parts of a second cross-linking agent, 0.05-0.3 part of an accelerant and the balance of a sodium chloride aqueous solution, and the sum of the raw materials is 100. On the basis of dual non-covalent bonds prepared by two-step polymerization, a weak network is formed at a target horizon by virtue of ionic bonds to quickly realize primary healing, and then a strong network based on hydrophobic association reaction is formed on the basis of the weak network of the ionic bonds, so that an energy dissipation mechanism based on the strong/weak network is formed, and good mechanical strength is ensured; and compared with covalent bonds, the multiple non-covalent network self-healing gel has a better healing effect.

Description

Technical field [0001] The present invention relates to a non-covalent bond synergistic self-healing gel plug and its preparation method and application thereof, belonging to the field of drilling fluid leakage. [0002] technical background [0003] Whether in drilling projects in land or ocean, fluorescence is the most common and difficult to manage project complex accidents. During the drilling, it is extremely easy to lose when drilling cracks, sewing, and crushing and ceiling are poorly leaks, and during deep water drilling of marine drilling, the water-absorbing pipe is required, which needs to be increased. The pressure pump carries the drillstone, which is prone to a well drain, but because the "respiratory effect" of deep water is drilled, it is difficult to discover the early lump drain. After the leakage is enhanced, the overflow or even blowout has brought huge losses. Suitable leak-proof / plugging materials can be prevented in time to prevent leaks, and polymer gels ...

Claims

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Application Information

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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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