Fluid loss additive for boring fluid

Abstract

The invention relates to a fluid loss control agent for drilling fluid, which is prepared through reacting natural humic acid with sodium-hydroxide to obtain humic sodium salts, then carrying out reduction copolymerization with sulfonated asphalt, hydroxyethyl cellulose, polyacrylamide, water-soluble silicon oil AND methyl aldehyde.

Description

technical field

[0001] The invention relates to a fluid loss reducer for well drilling Background technique

[0002] The main components of oilfield drilling mud are common soil and water, and various auxiliary chemical additives. In the process of continuous drilling, the phenomenon of water infiltrating into the formation is called dehydration. Excessive water loss per unit time will bring a series of adverse consequences: the collapse of the well wall, the shrinkage of the well diameter and the thickening of drilling fluid, etc., resulting in pipe sticking Wait for the occurrence of a vicious accident. The fluid loss control agent contains adsorption groups and hydration groups that can adsorb with clay, which can change the properties of the mud cake on the wall of the well: the treatment agent adsorbs on the surface of large clay particles to form a protective film, and the fine clay particles adsorb On the large chain link of the treatment agent, ...

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