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

A high-density, solid-free technology, applied in the fields of drilling fluids and completion fluids, can solve problems such as poor stability against high temperature and high pressure, corrosion, and low density of completion fluids, and achieve low corrosion, good rheology, and moderate price Effect

CN104610937AActive Publication Date: 2015-05-13成都西油华巍科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-05-13

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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.
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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 ...

Examples

Embodiment Construction

[0037] An environment-friendly high-density non-solid phase weighting agent, its components are proportioned as follows by weight fraction:

[0038] Dispersant: 0.02 to 0.05 parts;

[0039] Tackifier: 0.3 to 1 part;

[0040] Chelating agent: 0.5 to 1.2 parts;

[0041] Corrosion inhibitor: 0.6~2 parts;

[0042] Soluble Weighted Material: Balance.

[0043] Specifically, the dispersant is selected from one or both of sodium polyacrylate and phosphonocarboxylic acid copolymer.

[0044] Specifically, the thickener is selected from one or more of chitosan, agar, polyacrylamide, xanthan gum, and hydroxypropyl methylcellulose. Preferably, the thickener is one or both of xanthan gum and hydroxypropyl methylcellulose.

[0045] Specifically, the chelating agent is one or both of aminophosphonic acid chelating resin and disodium edetate.

[0046] Specifically, the corrosion inhibitor is one or both of polycarboxylic acid and sodium gluconate.

[0047] Specifically, the soluble weig...