Environment-friendly high-density solid-free weighting agent and preparation method

Abstract

An environment-friendly high-density solid-free weighting agent comprises components in parts by weight as follows: 0.02-0.05 parts of a dispersant, 0.3-1 part of a tackifier, 0.5-1.2 parts of chelating agent, 0.6-2 parts of a corrosion inhibitor and the balance of soluble weighting materials, wherein the dispersant is one or two of sodium polyacrylate and copolymer of phosphono and carboxylic acid; the tackifier is one or more of chitosan, agar, polyacrylamide, xanthan gum and hydroxypropyl methyl cellulose; the chelating agent is one or two of aminophosphonic acid chelate resin and ethylenediamine tetraacetic acid disodium; the corrosion inhibitor is one or two of multiple polycarboxylate and sodium gluconate; the soluble weighting materials are one or more of potassium formate, potassium citrate, potassium acetate, potassium silicate and potassium sulfate. The process steps are as follows: the raw materials are taken in weight proportion, mixed and uniformly stirred; the raw materials are added to water and dissolved at the high temperature of 70-80 DEG C; a product is evaporated to dryness, and solid is obtained; the obtained solid is ground into powder, and the solid weighting agent is obtained.

Description

technical field [0001] The invention belongs to new materials, relates to the fields of drilling fluid and well completion fluid, and in particular relates to an environment-friendly high-density solid-free weighting agent and a preparation method thereof. Background technique [0002] At present, the weighting agents widely used in drilling fluids and completion fluids mainly include barite powder, limestone powder, iron ore powder and ilmenite powder. Due to their different densities, the ability to increase the density of drilling fluid and completion fluid is also different, but they have a common feature that they exist in the aggravated fluid in the form of solid particles. The use of this type of weighting agent will increase a large number of solid particles, on the one hand, it will lead to poor rheology and lubricity of the drilling fluid and completion fluid, and affect its performance regulation; on the other hand, the solid particles of the weighting agent will ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an environment-friendly high-density solid-free weighting agent, which solves the problems of the existing solid-free drilling fluid and completion fluid, such as low density, serious corrosion, and poor stability against high temperature and high pressure. Density, high temperature resistance, environmental protection and non-toxic, moderate price and other characteristics

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