Preparation process of leak protection plugging agent along with drilling by controlling dosage of cross-linking agent

Abstract

The invention discloses a preparation process of a leak protection plugging agent along with drilling by controlling the dosage of a cross-linking agent. The preparation process comprises the following steps: (a) purifying AM (acrylamide) and AMPS (2-acrylamido-2-methyl propane sulfonic acid) for later use; (b) weighing AA (acrylic acid), hydrolyzing and transferring into a reactor in a super constant-temperature water bath; (c) adding a certain amount of cross-linking agent, wherein the dosage of the cross-linking agent is 0.28%-0.32%; (d) adding AM and AMPS solutions, and regulating the pH value of a reaction system to 7; (e) introducing inert gas for deoxygenation, stirring and adding an initiator; and (f) regulating the temperature to reaction temperature, and performing polymerization reaction for a certain period of time to get a target product. According to the preparation process disclosed by the invention, the leak protection plugging agent along with drilling can be successfully prepared by controlling the dosage of the cross-linking agent in reaction process, the preparation process further has the advantages of high production efficiency, simple production process, simplicity in operation and capability of greatly reducing production cost, various performances of the produced leak protection plugging agent along with drilling are far better than those of an existing product, and the leak protection plugging agent along with drilling is further conductive to field well leakage treatment.

Description

technical field [0001] The invention relates to a preparation process of an anti-leakage plugging agent while drilling which controls the dosage of a cross-linking agent. Background technique [0002] Lost circulation refers to the process of working fluid (including drilling fluid, cement slurry, completion fluid and other working fluids) in the process of various downhole operations such as drilling, cementing, testing or workover in oil and gas exploration and development. It is a kind of downhole complex situation that is lost into the formation under the action of drilling fluid, which is one of the most common and common technical problems in drilling engineering. The reason why it is called an underground complex situation is that most of its occurrences are not caused by human beings and are not transferred by human will. Of course, this statement is not accurate enough. If you encounter a lost channel that can produce lost circulation, but take corresponding effect...

AI Technical Summary

Problems solved by technology

[0008] The existing plugging methods have their own advantages and disadvantages, but in general they all delay the drilling time more or less and reduce the drilling efficiency. For example, the static plugging method needs to stop drilling. Leakage material changes the performance of the drilling fluid, and it is necessary to readjust the formula of the drilling fluid, etc., which will consume a lot of time, bring great inconvenience to drilling, and lead to large economic losses

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