High-dehydration hardenable plugging sealing agent

Abstract

The invention relates to a high-dehydration hardenable plugging sealing agent which comprises the following components by mass percent: 35-50% of solidifying material, 25-35% of composite sealing agent, 5-15% of high-dehydration material, 5-10% of elastic expending material and 10-15% of fiber material, wherein the composite sealing agent is formed by mixing granular husk, mica and cotton seed hull in a mass ratio of 5:2:1; the solidifying material is formed by mixing gypsum, cement, blast furnace slag and sodium phosphate in a mass ratio of 1:1:0.5:0.1; the high-dehydration material is kieselguhr or coal ash; the elastic expending material is formed by mixing coated water-sucking rubber and coated water-sucking resin in a mass ratio of 1:1; and the fiber material is polyacrylonitrile fiber of 9-11mm. The sealing agent integrates with high dehydration, delay expanding, plugging solidification and physical overlap joint; and the formed sealing layer is not easy to destroy in the subsequent drilling process, thereby effectively improving the sealing efficiency.

Description

technical field [0001] The invention relates to an additive used in the field of oil field drilling, in particular to a high water loss, hardenable, plugging and plugging agent. Background technique [0002] Lost circulation is a phenomenon in which drilling fluid, cement slurry or other working fluids are lost into the formation during drilling. The occurrence of lost circulation not only consumes drilling time and loss of drilling fluid, but also may cause a series of complex situations such as pipe sticking, blowout, and well collapse. In severe cases, the wellbore will be scrapped and cause major economic losses. [0003] Currently commonly used plugging materials are mainly divided into physical plugging materials and chemical plugging materials: physical plugging materials mainly include bridging plugging materials and high water loss plugging materials. The bridging plugging material is mainly based on the principle of particle gradation, using walnut shells, mica fl...

AI Technical Summary

Problems solved by technology

During the plugging process of the curable cement slurry system, the cement slurry is not easy to stay in the lost channel, and the plugging failure is often caused by leakage into the deep formation. Moreover, due to the solidification characteristics of the cement slurry, its injection time must be strictly controlled, making construction difficult. Big

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