High-adaptability temperature-resistant plugging agent and application method thereof

Abstract

The invention discloses a high-adaptability temperature-resistant plugging agent and application method thereof. The high-adaptability temperature-resistant plugging agent comprises the following components in percentage by weight: 31-34% of activated clay, 30-33% of flexible graphite, 30-31% of mica powder, 2-3% elastomer sponge and 2.5-3.5% of fibers. The invention further provides a preparationmethod of the high-adaptability temperature-resistant plugging agent and application thereof in preparation of plugging working fluid. Based on the base solution per 100milliliters, the addition amount of the high-adaptability temperature-resistant plugging agent is 8-15g. The method comprises the following steps: determining the setting depth of a light drill stem to be the top of a leakage zoneaccording to the leakage condition, accurately replacing the plugging slurry to the required position, rapidly lifting the drilling tool to a safety position, waiting or shutting in and building thepressure for 2-4 hours, and completing the plugging process. The plugging agent is excellent in temperature resistance and high in crack matching degree and can effectively enter the leakage zone to form plugging, the plugging success rate is improved, the plugging formula is single aiming at the leakage zone of different crack width, and convenience is brought to field operations.

Description

technical field [0001] The invention relates to a plugging agent used in oil exploration and drilling, in particular to a highly adaptable temperature-resistant plugging agent, which belongs to the technical field of drilling fluids. Background technique [0002] At present, conventional bridge plugging materials are mostly filled with bridge particles such as walnut shells and fibers such as sawdust. However, studies have shown that at high temperatures, these materials are prone to high-temperature corruption and decomposition, which will lead to the failure of the plugging layer after a long time and repeated leakage; at the same time, Conventional plugging materials have poor compatibility with fractures, and it is difficult to effectively enter the leakage layer to form plugging, resulting in a low plugging success rate. Contents of the invention [0003] In order to solve the above technical problems, the object of the present invention is to provide a highly adaptab...

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Problems solved by technology

[0002] At present, conventional bridge plugging materials are mostly filled with bridge particles such as walnut shells and fibers such as sawdust. However, studies have shown that at high temperatures, these materials are prone to high-temperature corruption and decomposition, which will lead to the failure of the plugging layer after a long time and repeated leakage; at the same time, Conventional plugging materials have poor compatibility with fractures, and it is difficult to effectively enter the leakage layer to form plugging, resulting in a low plugging success rate