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An oil-based annulus protection fluid injection process

A technology for protecting fluids and oil-based rings, applied in wellbore/well components, earthwork drilling and production, and cleaning equipment, etc., can solve the problems of low cost, corrosion and fracture failure of pipe strings, poor stability, etc., and achieve the prevention of residue and good process Feasibility effect

Active Publication Date: 2020-02-07
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Annulus protection fluids are generally divided into water-based annulus protection fluids and oil-based annulus protection fluids. The cost of water-based annulus protection fluids is relatively low, but their stability is poor. After the measures of adding water-based annulus protection fluids have been adopted in China Cases of pipe string corrosion and fracture failures still occur, so for oil and gas wells with high risk of pipe string corrosion, adding oil-based annulus protection fluid is the safest corrosion control measure
Directly injecting oil-based annulus protection fluid into the annulus often fails to achieve the ideal protection effect, and the residual medium in the annulus may still cause corrosion in the environment of oil-based annulus protection fluid

Method used

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  • An oil-based annulus protection fluid injection process

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing, the present invention is further described:

[0037] Depend on figure 1 Shown: an oil-based annulus protection fluid injection process, which injects cleaning fluid (3), front driving fluid (6), displacement fluid (7), rear driving fluid (8), The prefluid (9) and the oil-based annulus protection fluid (10) respectively form slugs in the pipe string, and the specific process flow is as follows:

[0038] a. Inject a mass of M into the oil sleeve annulus 1 The cleaning fluid (3) in the oil casing annulus will displace the original well fluid (4) from the tubing (1) to the wellhead, and the tubing and casing will be filled with the cleaning fluid and soak and absorb the corrosive substances and residual corrosive media in the annulus for 21 hours- 45h;

[0039] b. After the cleaning is completed, a section of mass M is injected into the annulus of the oil sleeve 3 The front drive fluid (6), the displacement cleaning fluid ...

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Abstract

The invention relates to an oil-based annular protecting fluid injection technology, and belongs to the technical field of oil-gas well safety protection. The technology comprises the steps that before oil-based annular protecting fluid is injected, cleaning fluid, alcohol and other treatment agents are injected for soaking and cleaning, and then residual water, sulphur-containing substances, microorganisms and the like in a shaft are removed; finally, the purpose of improving the oil-based annular protecting fluid anti-corrosion effect is achieved. According to the technology, various different treatment agents are injected into a tubular column in a segmental mode, all treatment agent dosage calculation formula and specific proportion of all treatment agent ingredients are designed, andthe technology has good technological feasibility, and is worthy of application and popularization.

Description

technical field [0001] The invention relates to an oil-based annulus protection fluid injection process, which belongs to the technical field of oil and gas well safety protection. Background technique [0002] The produced gas of sour oil and gas fields often contains corrosive gases such as carbon dioxide and hydrogen sulfide. Carbon dioxide is also widely used as injection gas in the carbon dioxide flooding recovery process. However, due to problems such as poor sealing of the packer, corrosive gases such as carbon dioxide and hydrogen sulfide may escape into the annulus, causing corrosion of the oil well tubing string. Carbon dioxide and hydrogen sulfide corrosion control technologies can be classified into three categories: selection of corrosion-resistant materials, injection of annular protection fluid, and inner wall coating or lining. Annulus protection fluid injection is an economical, reliable and flexible corrosion control method, so it is most widely used in oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/02E21B37/00
CPCE21B37/00E21B41/02
Inventor 曾德智黄致尧喻智明同航董宝军李皓戚亚东曾凤施太和
Owner SOUTHWEST PETROLEUM UNIV
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