Drilling fluid and composite additive

Abstract

The invention belongs to the field of well drilling. Aiming at solving the problems that the water loss amount of the traditional positively-charged drilling fluid is great and the drilling fluid cannot be simultaneously used together with a filtration-reducing agent, the invention provides an MMH (mixed metal hydrides) mud composite additive. The MMH mud composite additive is prepared from the following raw materials in parts by weight: 1 part of MMH, 0.2-3 parts of xanthan gum, 0.05-0.1 part of polymer covering inhibitor, 0.05-0.15 part of tackifier, 0.1-0.3 part of organic silicon de-foaming agent and 0.2-0.3 part of superfine calcium carbonate. The invention further provides a drilling fluid which is prepared from the MMH mud composite additive.

Description

technical field [0001] The invention belongs to the field of well drilling, and in particular relates to a composite additive for electropositive gel mud and a drilling fluid prepared by the composite additive. Background technique [0002] Drilling fluid is one of the important means to serve horizontal directional drilling. The main function of drilling fluid has evolved from maintaining wellbore stability and ensuring safe drilling to the stage of integrating many functions. Therefore, choosing an appropriate drilling fluid is the basis for ensuring the smooth completion of horizontal directional drilling. [0003] Since there are many types and products of drilling fluid and drilling fluid treatment agent to choose from, modern drilling fluid technology no longer researches and develops general drilling fluid and treatment agent products, but is efficient and cheap, one agent with multiple effects, protection In-depth research on the environment and other aspects to se...

AI Technical Summary

Problems solved by technology

However, after adding positive drilling fluid treatment agent, the water loss of drilling fluid will usually increase greatly

However, most of the traditional fluid loss reducers are limited to anionic type. Once added, the structure and characteristics of positively charged drilling fluid will be obviously destroyed, the dynamic-plastic ratio will be significantly reduced, and the static shear force will also be greatly reduced.

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