Completion fluid composition and application thereof

Abstract

The invention provides a completion fluid composition and application thereof. The completion fluid composition comprises a weighting agent, a synergist, a corrosion inhibitor, a deoxidizing agent, achelating agent and water, wherein the weighting agent comprises halide salt, nitrate, organic copper salt, organic zinc salt, formate and acetate.

Description

technical field [0001] The invention provides a well completion fluid composition and its application, especially as at least one of perforating fluid, killing fluid, packer fluid, plugging fluid, annulus protection fluid and solid-free drilling fluid in the application. Background technique [0002] Completion fluid is the key liquid in well completion engineering, and it is the working fluid in the wellbore during the well completion operation. Its main functions may include: balancing formation pressure, reducing formation damage, protecting pipe strings, isolating wellbore, and completing operation measures. Since there are many completion operations, such as perforation, pipe string testing, well killing, plugging, preparation for production operations, etc., completion fluids that meet different construction conditions are also required. In addition, with the discovery of deep reservoirs, a large number of oil and gas wells with ultra-high temperature, ultra-high pres...

AI Technical Summary

Problems solved by technology

However, in the development process of ultra-deep wells, acidic media such as carbon dioxide and hydrogen sulfide under ultra-high temperature and high pressure conditions can easily lead to acidification of completion fluids and a large amount of decomposition of formate, which in turn leads to corrosion and cracking of oil casings.

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