Acid-soluble pressure-bearing plugging agent for drilling fluid and preparation method

Abstract

The invention relates to an acid-soluble pressure-bearing plugging agent for drilling fluid and a preparation method. The acid-soluble pressure-bearing plugging agent contains a friction material, a bridging material, a filler material, iron tailing sand, volcanic ash powder, woody activated carbon powder, nano calcium-zinc phosphate, paraffin, polyalcohol fatty acid ester, titanium white, red clay, alginic acid, dimethyl diallyl ammonium chloride, polyvinyl acetate, glyceryl monostearate, a glued stone cementing material, copper oxide, Dibenzyl disulfide, alpha-n-octyl-cyanoacrylate, sodium caseinate, steel slag, white carbon black, dolomite powder, manganese dioxide, diatomite, dibutyl phthalate, polyvinyl alcohol, tert-butylhydroquinone, phthalic anhydride and H2O. According to the acid-soluble pressure-bearing plugging agent for the drilling fluid and the preparation method, by using the preparation method, the defects in the prior art that on-site operating methods are tedious, operating requirements are strict, plugging performance is often poor due to invasion of surrounding solid-state particulate matters, a plugging framework is damaged, and a motor shaft or rotating shaft is subjected to expanding and contracting under the action of stress of the shaft during rotating due to infirm connection are avoided.

Description

technical field [0001] The invention belongs to the technical field of plugging agents, and in particular relates to an acid-soluble pressure-bearing plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] In order to improve the plugging success rate and bearing pressure of smooth fracture lost circulation, reduce the complex failure of lost circulation, and improve the drilling efficiency of exploration and development, a drilling fluid composed of friction material, bridging material and filling material is proposed in the prior art The pressure-bearing plugging agent has a simple preparation process, a wide source of materials, and is easy to popularize and use. [0003] However, during the specific use of the pressure-bearing plugging agent for drilling fluid, the on-site operation methods are cumbersome, the operation requirements are strict, and the surrounding solid particles invade, so that the plugging performance is often ...

AI Technical Summary

Problems solved by technology

[0003] However, in the specific use process of the pressure-bearing plugging agent for drilling fluid, there are often cumbersome on-site operation methods, strict operation requirements, and the invasion of surrounding solid particles, so that poor plugging performance often occurs.

[0004] In addition, during the specific use of the pressure-bearing plugging agent for drilling fluid, its strip structure is often pierced by external spikes, causing damage to the plugging structure and impairing the plugging performance.

[0005] In addition, in the preparation process of the pressure-bearing plugging agent for drilling fluid, the motor shaft of the motor and the rotating shaft of the agitator are often connected through the shaft connector to allow the agitator to stir. However, the current shaft The connector often has the problem of flexion and extension of the motor shaft or shaft due to the stress of the shaft rotation process due to the unreliable connection

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