A kind of multifunctional oil-based mud cleaning fluid and preparation method thereof

Abstract

The invention discloses a multifunctional oil-based mud cleaning liquid and a preparation method thereof. The multifunctional oil-based mud cleaning liquid comprises, by weight, 5-20 parts of nonionic surfactants, 0-10 parts of an organic acid and 60-95 parts of water, wherein the nonionic surfactants comprises at least two of fatty alcohol-polyoxyethylene ether, alkyl glycoside and alkylphenol ethoxylate. The preparation method comprises component mixing and stirring. The multifunctional oil-based mud cleaning liquid is suitable for a high-temperature high-salt complex environment with a wide range, can be used for cleaning oil-based mud-polluted casing pipe and well walls and removing oil-based mud cake, has a scientific formula, small toxicity and a low environmental pollution level and is conducive to safe production and environmental protection.

Description

technical field [0001] The present application relates to a multifunctional oil-based mud cleaning solution and a preparation method thereof, in particular to a multifunctional oil-based mud cleaning solution capable of adapting to different temperature and salinity ranges and a preparation method thereof. Background technique [0002] Oil-based drilling fluid has the advantages of good thermal stability, wide density range, easy adjustment of rheology, resistance to various salt pollution, strong inhibitory effect on mud shale, etc. Therefore, oil-based mud is often used for drilling in well areas with high reservoir water sensitivity to protect oil and gas layers from damage. However, the oil-based drilling fluid deposits and mud cakes formed on the casing wall and well wall seriously affect the quality of drilling and completion, so the cleaning of oil-based mud is an essential work. [0003] Although the current oil-based mud cleaning fluids have a certain cleaning effe...

AI Technical Summary

Problems solved by technology

However, the oil-based drilling fluid deposits and mud cakes formed on the casing wall and well wall seriously affect the quality of drilling and completion, so the cleaning of oil-based mud is an essential work

[0003] Although the current oil-based mud cleaning fluids have a certain cleaning effect, they often have the problems of large amount of surfactant, high cost, complicated formula and preparation process, and unfavorable environmental protection. In addition, most oil-based mud cleaning fluids cannot Satisfy the environment of high temperature and high salinity, or the applicable temperature and salinity range is narrow, and the function is relatively single

Images