Acid soluble curing plugging agent

Abstract

The invention provides an acid soluble curing plugging agent. The acid soluble curing plugging agent is prepared from, by mass, 30 wt%-60 wt% of G-level oil well cement, 20 wt%-50 wt% of acid soluble superfine calcium carbonate, 5 wt%-15 wt% of sepiolite, 5 wt%-10 wt% of calcium oxide and 10 wt%-20 wt% of diatomite, and the total mass percent of the raw materials is 100%. The acid soluble curing plugging agent can conduct curing plugging when leakage occurs in the drilling process, and acid soluble plugging releasing can be conducted during oil recovery.

Description

technical field [0001] The invention relates to a leak stoppage agent, in particular to an acid-soluble solidified leak stoppage agent, which belongs to the technical field of leak stoppage agent materials. Background technique [0002] Lost circulation is a common problem in drilling engineering. Lost circulation not only consumes drilling time and loses mud, but also may cause a series of complex situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore, resulting in major economic losses. Therefore, during the drilling process, the leakage channel needs to be blocked in case of lost circulation, but during oil recovery, the channel needs to be opened to facilitate oil recovery. This requires temporary plugging materials, which can be solidified and plugged when lost circulation is encountered during drilling, and plugging agents that can be removed during oil production to facilitate oil recovery. Contents of the invent...

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Problems solved by technology

[0002] Lost circulation is a common problem in drilling engineering. Lost circulation not only consumes drilling time and loses mud, but also may cause a series of complicated situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore, resulting in major economic losses.

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