Bionic wall-solidifying agent for drilling fluid and preparation method thereof

Abstract

The invention relates to a bionic wall reinforcer for drilling fluids and a preparation method thereof. The bionic wall reinforcer is prepared from the following raw materials in parts by weight: 85.215-85.237 parts of distilled water, 9.129-9.140 parts of polyphenol protein, 3.550-3.561 parts of acrylamide, 2.028-2.039 parts of dimethyldiallylammonium chloride and 0.072-0.083 part of potassium persulfate. The preparation method of the bionic wall reinforcer for drilling fluids comprises the following steps: preparing a bionic group solution; preparing a bionic wall reinforcer potential solution; and preparing the bionic wall reinforcer. The properties of the bionic wall reinforcer are as follows: the low-temperature low-pressure filter loss reduction rate is greater than or equal to 30%, the core compression strength increase rate is greater than or equal to 8%, and the core linear expansion reduction rate is greater than or equal to 30%. The bionic wall reinforcer solves the problems of high collapse tendency of the shaft wall and loss of the drilling fluid in the existing drilling process, has high biodegradability, and effectively lowers the reservoir pollution.

Description

Technical field [0001] The invention relates to a petroleum drilling fluid auxiliary agent, in particular to a bionic wall fixing agent for drilling fluid. The invention also relates to a preparation method of the bionic wall fixing agent for drilling fluid. Background technique [0002] During the drilling of oil and gas wells, because the formation contains a lot of shale, the drilling fluid can easily cause the shale to hydrate, swell, disperse, and spall, which can cause well wall instability, accidents such as well collapse and burial, and cause major economic losses; During the drilling process, the ground stress around the borehole wall is released. Conventional drilling fluids will reduce the compressive strength of the borehole wall, which is not conducive to the stability of the borehole wall. Traditional drilling fluid materials are difficult to degrade, which will cause a large degree of pollution to the reservoir and affect later oil and gas The mining output of the...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a bionic wall-solidifying agent for drilling fluid, which can solve the problems that the well wall is easy to collapse and the drilling fluid is lost during the current drilling process, and at the same time, the bionic wall-solidifying agent has strong biodegradability , can effectively reduce the pollution of the reservoir

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