High-temperature gas well and horizontal well drilling fluid and completion fluid containing same

Abstract

The invention discloses a high-temperature gas well and horizontal well drilling fluid and a completion fluid containing the same. On the basis of an original polymer sulfonated water-base drilling fluid, an acid soluble material is added to achieving weighing so as to serve as the completion fluid, the completion fluid is higher in mud-cake acid solubility and flowback rate and good in reservoir bed protective capability. The phenomena that in the later period of well completion test process, the continuous high-temperature resistant stability is poor and the probability of high-temperature degradation is high are avoided, and the problems that the later-period test result accuracy and the productivity discovery are seriously influenced, and tool blockage and accidents are easily caused are solved. The high-temperature gas well and horizontal well drilling fluid consists of a base fluid and a heavy weight additive, wherein the base fluid comprises water, a thickening agent, drilling Bentonite, an inhibiter, a plugging agent, a fluid loss reducer and a lubricant; the heavy weight additive is barite. The high-temperature gas well and horizontal well completion fluid comprises the base fluid and the heavy weight additive, wherein the base fluid is the original drilling fluid; the heavy weight additive is an acid soluble material.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a high-temperature gas well horizontal well drilling fluid and a completion fluid containing the drilling fluid. Background technique [0002] Drilling fluid refers to the general name of various circulating fluids that meet the needs of drilling work with its multiple functions in the process of oil and gas drilling, commonly known as mud. The completion fluid refers to the fluid used in the production layer in the drilling of oil and gas layers, perforation, sand control and various stimulation measures. [0003] Horizontal well drilling fluid can be divided into water-based drilling fluid and oil-based drilling fluid according to different types. Among them, water-based drilling fluids include: polymer water-based drilling fluids, solid-free drilling and completion fluids, etc. At present, polymer water-based drilling fluids are mostly used in China. [0004] Due to cos...

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Problems solved by technology

And in the later completion test process, the continuous high temperature resistance is better, and it is not easy to cause high temperature degradation or blockage of tools, causing accidents

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