Drilling Fluid Additive Composition Suitable for Coal-Bed Gas Wells, and Water-Based Drilling Fluid and Use Thereof
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United States of America Patent
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Jun 28, 2017
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Aug 25, 2016
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Abstract
The present invention relates to the well drilling field in petroleum industry, in particular to a drilling fluid additive composition suitable for coal-bed gas wells, and a water-based drilling fluid and use of the water-based drilling fluid. The drilling fluid additive composition suitable for coal-bed gas wells, comprising a tackifying and shear improver, a capsulating agent, a filtrate reducer, and an amphiphobic wettability reversal agent, wherein, the tackifying and shear improver is a copolymer comprising structural units represented by formula (1), structural units represented by formula (2), and structural units represented by formula (3); the capsulating agent is a comb-like polysaccharide compound; the filtrate reducer is nanocrystalline cellulose, and the amphiphobic wettability reversal agent is a dual-cation fluorocarbon surfactant. The composition provided in the present invention can be used as an additive in a solid-free brine drilling fluid, so that the brine drilling fluid obtains advantages of a high penetration rate and a low residue rate.
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