Abstract

Wellbore instability is a challenging technical problem in drilling operation, shale inhibitor can effectively inhibit shale hydration and dispersion, so as to stabilize the wellbore of shale. In this paper, graphene oxide was prepared by Hummer’s method, and modified by 3-aminopropyltriethoxysilane. The structure of modified graphene oxide was characterized using FT-IR and TGA, and the results showed that modified graphene oxide has been successfully prepared. The inhibitive performance was investigated by the linear swelling and hot-rolling tests, which shows the swelling rate of artificial core is reduced by 10.32% in 2.0% inhibitor solutions and the shale rolling recovery rate was reached 90.13% in 3.0% inhibitor solutions at the rolling condition of 120 °C × 16 h. Finally, the inhibition mechanism was studied, inhibitor can enter into the interlayer of shale and change the appearance of bentonite by physical and chemical interaction, and in that way achieve a good inhibition result.

摘要

井眼不稳定是钻井作业中的一个具有挑战性的技术问题，页岩抑制剂可以有效抑制页岩水化和分散，从而稳定页岩井眼。本文采用 Hummer 法制备氧化石墨烯，并用 3-氨基丙基三乙氧基硅烷进行改性。使用FT-IR和TGA表征了改性氧化石墨烯的结构，结果表明已成功制备改性氧化石墨烯。通过线性溶胀和热轧试验考察了抑制性能，结果表明，在2.0%的抑制剂溶液中，人工岩心的溶胀率降低了10.32%，在3.0%的抑制剂溶液中，页岩碾压恢复率达到了90.13%。轧制条件为 120 °C × 16 h。最后研究了抑制机制，