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Low-cost oil-based annulus protection fluid applicable to CO2 flooding well and preparation method thereof

An annulus protection fluid, a low-cost technology, applied in wellbore/well components, earthwork drilling and production, etc., can solve the problem of unsatisfactory stability of water-based annulus protection fluid and high cost of ordinary oil-based annulus protection fluid , pipe string connection joint crevice corrosion and other problems, to achieve good anti-hydrogen sulfide environment fracture performance, good corrosion inhibition effect, low stability effect

Inactive Publication Date: 2018-01-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For high CO 2 Partial pressure especially supercritical CO 2 In corrosive environment, there is a very high risk of corrosion failure in the wellbore. The main problems at present are: (1) the sulfur-containing corrosive medium in the annulus may induce cracking of the pipe environment; (2) the pipe string joints are prone to crevice corrosion; (3) the water The stability of the oil-based annulus protection fluid is still not satisfactory; (4) The cost of ordinary oil-based annulus protection fluid is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0017] The present invention is prepared from the following raw materials: 1% morpholine derivative composite corrosion inhibitor, 0.8% bromochlorohydantoin, 3% D-sodium erythorbate, 5% organic acid salt density regulator, 3% fatty alcohol polyoxygen Vinyl ether, and the balance is refrigerating machine oil.

[0018] The specific preparation steps are: (1) Add 3% fatty alcohol-based polyoxyethylene ether to a closed reaction vessel; (2) Add 1% corrosion inhibitors (morpholine derivatives, imidazoline dithiourea, propynol Ratio 1:2:1); (3) add 0.8% bromochlorohydantoin, 3% sodium D-isoascorbate, and 5% organic acid salt density regulator to the container in sequence; (4) add refrigerating machine oil to the container, fully Stir to dissolve.

Embodiment example 2

[0020] The invention is made from the following raw materials: 2% morpholine derivative composite corrosion inhibitor, 1.2% bromochlorohydantoin, 4% D-sodium erythorbate, 20% organic acid salt density regulator, 4% fatty alcohol polyoxygen Vinyl ether, and the balance is refrigerating machine oil.

[0021] The specific preparation steps are: (1) Add 4% fatty alcohol-based polyoxyethylene ether to a closed reaction vessel; (2) Add 2% corrosion inhibitors (morpholine derivatives, imidazoline dithiourea, propynol Ratio 1:2:1); (3) Add 1.2% bromochlorohydantoin, 4% D-sodium erythorbate, and 20% organic acid salt density regulator to the container in sequence; (4) Add refrigerating machine oil to the container, fully Stir to dissolve.

Embodiment example 3

[0023] The present invention is made from the following raw materials: 3% morpholine derivative composite corrosion inhibitor, 1.6% bromochlorohydantoin, 5% D-sodium erythorbate, 30% organic acid salt density regulator, 5% fatty alcohol polyoxygen Vinyl ether, and the balance is refrigerating machine oil.

[0024] The specific preparation steps are: (1) Add 5% fatty alcohol-based polyoxyethylene ether to a closed reaction vessel; (2) Add 3% corrosion inhibitors (morpholine derivatives, imidazoline dithiourea, propynyl alcohol) to the vessel Ratio 1:2:1); (3) add 1.6% bromochlorohydantoin, 5% sodium D-isoascorbate, and 30% organic acid salt density regulator to the container in sequence; (4) add refrigerating machine oil to the container, fully Stir to dissolve.

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Abstract

The invention provides low-cost oil-based annulus protection fluid applicable to a CO2 flooding well and a preparation method thereof and belongs to the technical field of corrosion protection of an oil and gas well. A low-cost oil-based annulus protection fluid system applicable to the CO2 flooding well is prepared by compounding engine oil, a corrosion inhibitor, a bactericide, an oxygen removing agent, a density regulator and a surfactant. The annulus protection fluid is prepared from the following components in percentage by mass: 1 percent to 3 percent of a morpholine derivative compoundcorrosion inhibitor, 0.8 percent to 1.6 percent of halogenated hydantoin bactericide, 3 percent to 5 percent of the oxygen removing agent, 5 percent to 30 percent of an organic acid salt density regulator, 3 percent to 5 percent of a non-ionic type polyoxyethylene type surfactant and the balance of the engine oil. The oil-based annulus protection fluid provided by the invention has a very good protection effect on a shaft tubular column of the CO2 flooding well and has the advantages of good high-temperature stability, good low-temperature freezing resistance and long-period stability; meanwhile, the refrigeration engine oil is used as a dispersant, so that the low-cost oil-based annulus protection fluid has the advantages of low cost and the like.

Description

technical field [0001] The present invention provides a CO 2 A low-cost oil-based annulus protection fluid for flooding injection wells and a preparation method thereof belong to the technical field of corrosion protection for oil and gas wells. Background technique [0002] With the deepening of oil and gas field development, the development and application of carbon dioxide flooding enhanced oil recovery (EOR) technology has been vigorously carried out at home and abroad in recent years. This technology can not only meet the needs of oilfield development, but also solve CO 2 The problem of sequestration, the protection of the atmospheric environment, and the control of the greenhouse effect. Oilfields often use CO 2 Auxiliary steam flooding is used to enhance oil and gas recovery, especially for low-permeability and ultra-low-permeability reservoirs containing high-viscosity crude oil, which can significantly improve oil recovery. However, in CO 2 In the process of oi...

Claims

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Application Information

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IPC IPC(8): C09K8/54
CPCC23F11/10
Inventor 曾德智黄致尧同航蔡乐乐陆凯李皓潘潇扬施太和
Owner SOUTHWEST PETROLEUM UNIV
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