Filtrate reducer for drilling fluid and preparation method of filtrate reducer

Abstract

The invention relates to a filtrate reducer for drilling fluid and a preparation method of the filtrate reducer, and belongs to the technical field of oil industry drilling fluid treatment agents. The filtrate reducer for the drilling fluid comprises, by weight, 8-20 parts of natural asphalt, 5-8 parts of methylene diacrylamide, 3-5 parts of maleic anhydride, 6-10 parts of methyl methacrylate isooctyl, 0.02-0.06 part of sodium hydrogen sulfite, 3-5 parts of sodium humate, 5-8 parts of xanthan gum, 4-6 parts of polyacrylic acid, 0.5-1 part of chloretone, 0.1-0.3 part of edetate disodium, 1-5 parts of triethanolamine, 10-15 parts of pentaerythritol and 50-80 parts of ethyl acetate. The filtrate reducer has a fine filtrate reducing function and further has the advantages of fine temperature resistance, salinity resistance, collapse prevention, lubrication and the like.

Description

Technical field

[0001] The invention belongs to the technical field of drilling fluid treatment agents in the petroleum industry, and particularly relates to a fluid loss control agent used in drilling fluids and a preparation method thereof. Background technique

[0002] Drilling fluid is the circulating flushing medium used in the hole during drilling. Drilling fluid is the blood of drilling, also called drilling flushing fluid. Drilling fluid can be divided into clean water, mud, clay-free flushing fluid, emulsion, foam and compressed air according to its composition. Clear water is the earliest drilling fluid used, no treatment is required, easy to use, and suitable for intact rock formations and areas with sufficient water sources. Mud is a widely used drilling fluid, which is mainly suitable for unstable rock formations such as loose, well-developed cracks, easy to collapse and block, swelling and spalling in contact with water.

[0003] During the drilling process, due to...

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