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A kind of microemulsion single-step acid for oil well and its preparation method and application

A microemulsion and single-step acid technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of shortened validity period of acidizing operation, increased environmental pollution, and poor plugging removal effect. Achieve low secondary inhibition performance, avoid environmental pollution, and avoid clay effects

Active Publication Date: 2021-07-27
西安均德石油工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The plugging removal effect on organic matter such as formation wax and asphaltene is poor, and the oil phase used is mainly diesel oil, and the wax melting rate is only 0.005g / min; (2) A certain amount of secondary precipitation occurs during the operation, which makes acidification The validity period of the operation is shortened; (3) the need to flow back after the operation will increase the environmental pollution, and the operation cycle will be longer

Method used

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  • A kind of microemulsion single-step acid for oil well and its preparation method and application
  • A kind of microemulsion single-step acid for oil well and its preparation method and application
  • A kind of microemulsion single-step acid for oil well and its preparation method and application

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Embodiment 1

[0023] This embodiment provides a microemulsion single-step acid for oil wells, the raw material composition of the microemulsion single-step acid for oil wells includes: 2% hot-melt grade ethylene-vinyl acetate copolymer EVA260, 20% xylene, 15.0% Dodecyldimethylamine oxide, 40.0% hydrochloric acid, 10.0% hydrofluoric acid, 12% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer AA / AMPS and the balance water , each raw material is calculated by mass percentage.

[0024] Above-mentioned microemulsion single-step acid for oil well is prepared through the following steps:

[0025] At room temperature, add hot-melt grade ethylene-vinyl acetate copolymer to the reactor successively to heat up to 40°C for EVA260 and xylene, stir for 30 minutes, and then cool the reactor to 600r / min. Add dodecyl dimethyl amine oxide, hydrofluoric acid, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer AA / AMPS and the remainder of water after room temperature and stir for ...

Embodiment 2

[0044] The present embodiment provides a microemulsion single-step acid for oil wells, the raw material composition of the microemulsion single-step acid for oil wells includes: 3% hot-melt grade ethylene-vinyl acetate copolymer EVA260, 24% xylene, 18.0% Dodecyldimethylamine oxide, 40.0% hydrochloric acid, 12.0% hydrofluoric acid, 16% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer AA / AMPS and the balance water .

[0045] Above-mentioned microemulsion single-step acid for oil well is prepared through the following steps:

[0046] At room temperature, add hot-melt grade ethylene-vinyl acetate copolymer to the reactor successively to heat up to 40°C for EVA260 and xylene, stir for 30 minutes, and then cool the reactor to 600r / min. Add dodecyl dimethyl amine oxide, hydrofluoric acid, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer AA / AMPS and the remainder of water after room temperature and stir for 30 minutes to obtain the described Microemul...

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Abstract

The invention provides a microemulsion single-step acid for oil well, its preparation method and application. The raw material composition of the microemulsion single-step acid for oil wells includes: 2%-3% wax crystal improver, 18%-24% organic fouling plugging agent, 15.0%-20.0% amine oxide surfactant, 30.0% %-40.0% hydrochloric acid, 7.0%-12.0% hydrofluoric acid, 12%-16% polycarboxylate chelating agent and the rest of water. The microemulsion single-step acid can effectively dissolve the inorganic scale and organic scale near the wellbore without flowback. Cooperative effect, effectively inhibit the secondary precipitation produced in the acidizing process, increase the action distance of the acid liquid, and effectively dissolve the clogging formed by waxes and asphaltene in the formation, so that the lattice distortion of the wax and asphaltene occurs. Flowback is convenient for construction and avoids environmental pollution.

Description

technical field [0001] The invention relates to the field of chemical agents for oil field development, in particular to a preparation method and application of a microemulsion single-step acid for oil wells. Background technique [0002] Acidizing technology can improve the permeability of the near-wellbore zone by dissolving rocks and plugs in the near-wellbore zone, thereby increasing the production capacity of oil wells and the water injection capacity of water injection wells. Acidizing technology has become the main measure for low-permeability formation reconstruction. At present, the traditional acid system It is mainly used to remove inorganic blockages and dissolved rocks near the wellbore, but cannot remove organic blockages and suspended oil near the wellbore, and the effect of emulsified oil on water phase permeability. The existing microlactic acid has the following problems: [0003] (1) The plugging removal effect on organic matter such as formation wax and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/524E21B43/27E21B37/06
CPCC09K8/524C09K8/725C09K8/74E21B37/06E21B43/26
Inventor 胡佳杰李杰陈志刚袁树新辛有成
Owner 西安均德石油工程技术有限公司