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Self-healing material for well cementation and preparation method thereof

A healing material and cementing technology, which is applied in the field of polymer materials, can solve problems such as failure to meet the cementing requirements of high-pressure natural gas wells, failure to achieve cement sheath recovery, and weak natural gas response capabilities, so as to improve self-healing ability and large volume Expansion, strong mechanical strength effect

Active Publication Date: 2021-02-23
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long-term high temperature and high pressure underground and high shear during cementing construction, the environment is very different from that of conventional materials, and it is difficult to treat it through external photothermoelectric intervention at a depth of several thousand meters underground. At present, the existing self-healing technology has relatively high Large limitations, still can not solve the oil and gas well cement sheath micro-crack damage to improve the sealing performance of cement sheath
It has also been reported in the literature that oil-gas responsive self-healing materials are used to restore the sealing performance of the cement sheath of oil and gas wells. Strong self-healing ability, but still weak response to natural gas, unable to restore cement sheath sealing ability
In summary, the current self-healing materials have weak response to natural gas and cannot meet the cementing requirements of high-pressure natural gas wells.

Method used

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  • Self-healing material for well cementation and preparation method thereof
  • Self-healing material for well cementation and preparation method thereof
  • Self-healing material for well cementation and preparation method thereof

Examples

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preparation example Construction

[0034] According to a typical embodiment of the present invention, a method for preparing a self-healing material for well cementing is provided, such as figure 1 As shown, the method includes:

[0035] S1. In parts by weight, 70-80 parts of styrene, 15-30 parts of A-type reactive monomer, 10-15 parts of cross-linking monomer, 1-3 parts of pH regulator, and 0.5-1 part of anionic emulsifier 1. Mix 1-2 parts of non-ionic emulsifier with 50-100 parts of deionized water to obtain pre-emulsion of nuclear raw materials;

[0036] S2. Reacting 0.10-0.80 parts of the nuclear initiator and the nuclear raw material pre-emulsion by emulsion polymerization to obtain a nuclear polymer emulsion;

[0037] S3, 70-80 parts by weight of styrene, 15-30 parts of A-type reactive monomers, 20-30 parts of B-type reactive monomers, 5-10 parts of cross-linking monomers, 1-30 parts of pH regulators 3 parts, 0.2-5 parts of reactive emulsifier, 0.5-1 part of anionic emulsifier, 1-2 parts of non-ionic em...

Embodiment 1

[0063] A self-healing material for well cementing provided in this embodiment is prepared through the following steps:

[0064] (1) Pre-emulsion preparation of nuclear raw materials: put 80 kg of styrene, 25 kg of butyl methacrylate, 10 kg of divinylbenzene, 1.5 kg of sodium dihydrogen phosphate, and 0.5 kg of sodium dodecylbenzenesulfonate into the mixing tank H1. kg, nonylphenol polyoxyethylene ether 1.2kg, deionized water 70kg, high-speed stirring for 60min to prepare the core part of the pre-emulsion, set aside;

[0065] (2) Pre-emulsion of raw materials for the shell part: put 70kg of styrene, 20kg of butyl acrylate, 30kg of isooctyl acrylate, 5kg of divinylbenzene, 1.5kg of sodium dihydrogen phosphate, and allyl polyoxyethylene into the mixing tank H2. Ether fatty alcohol 0.4kg, sodium dodecylbenzenesulfonate 0.6kg, nonylphenol polyoxyethylene ether 1.0kg, deionized water 120kg. Stir at high speed for 60 minutes to prepare the shell part pre-emulsion and set aside;

[...

Embodiment 2

[0071] (1) Pre-emulsion preparation of nuclear raw materials: 70kg of styrene, 30kg of methyl methacrylate, 15kg of divinylbenzene, 1.0kg of sodium dihydrogen phosphate, 0.7kg of sodium lauryl sulfate, Nonylphenol polyoxyethylene ether 1.4kg, deionized water 90kg, high-speed stirring for 60min to prepare the core part of the pre-emulsion, set aside;

[0072] (2) Raw material pre-emulsion for the shell part: put 70kg of styrene, 15kg of butyl methacrylate, 20kg of isooctyl acrylate, 6kg of divinylbenzene, 1.0kg of sodium dihydrogen phosphate, and allyl polyoxygen into the mixing tank H2. Vinyl ether fatty alcohol 0.4kg, sodium lauryl sulfate 0.6kg, nonylphenol polyoxyethylene ether 1.0kg, deionized water 120kg. Stir at high speed for 60 minutes to prepare the shell part pre-emulsion and set aside;

[0073](3) Initiator solution preparation: 0.5 kg of ammonium persulfate is dissolved in 4.5 kg of deionized water, marked as a nuclear initiator; 0.6 kg of ammonium persulfate is d...

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Abstract

The invention discloses a self-healing material for well cementation and a preparation method thereof. The method comprises the following steps: uniformly mixing 70-80 parts of styrene, 15-30 parts ofA-type reaction monomers, 10-15 parts of crosslinking monomers, 1-3 parts of a pH regulator, 0.5-1 part of an anionic emulsifier, 1-2 parts of a nonionic emulsifier and 50-100 parts of water to obtain a nuclear raw material pre-emulsion; subjecting 0.10-0.80 part of a core initiator to reacting with the core raw material pre-emulsion by adopting an emulsion polymerization method so as to obtain acore polymer emulsion; uniformly mixing 70-80 parts of styrene, 15-30 parts of the A-type reaction monomers, 20-30 parts of B-type reaction monomers, 5-10 parts of the crosslinking monomers, 1-3 parts of the pH regulator, 0.2-5 parts of a reactive emulsifier, 0.5-1 part of the anionic emulsifier, 1-2 parts of the nonionic emulsifier and 100-150 parts of water to obtain a shell raw material pre-emulsion; and uniformly mixing 0.10-0.80 part of a shell initiator, the shell raw material pre-emulsion and the core polymer emulsion to obtain the self-healing material.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a self-healing material for well cementing and a preparation method thereof. Background technique [0002] The purpose of oil and gas well cementing is to seal the annular space between the casing and the formation, to isolate oil, gas and water layers, etc., to protect the production layer and support the protective casing. However, most cement sheaths currently belong to Portland cement, and because Portland cement is relatively brittle, microcracks will appear in the cement sheath during acid fracturing, perforation, drilling impact, and formation activities in oil and gas wells, which will damage the cement sheath. The interlayer sealing ability of the cement annulus leads to oil and gas channeling or annular pressure, which affects the life of oil and gas wells or the productivity of oil and gas reservoirs. In severe cases, wells need to be shut down, and sometimes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F283/06C08F212/08C08F220/18C08F212/36C08F222/14C08F2/26C08F2/30C09K8/467C04B24/26
CPCC08F257/02C08F283/065C08F2/26C08F2/30C09K8/467C04B24/2694C08F212/08C08F220/1804C08F220/1808C08F212/36C08F220/1802C08F220/1812C08F222/103
Inventor 赵宝辉曾建国石凌龙王建瑶夏元博孙富全邹建龙
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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