Based on self-made shale formation simulated artificial cores to evaluate water-based drilling fluids plugging effect technology

Plugging technology is one of the leading problems in shale gas drilling engineering, as it causes wellbore stability, shale formation collapse, and so on. In order to solve these problems, in this paper, we committed to preparing artificial cores whose original permeability was 1.16x10-4 mD, which could be used to simulate the shale formation, and established a sealing evaluation method to assess the effect of plugging technology by measuring permeability reduction rate K '. Verified the good reproducibility of the artificial cores through a lot of high temperature and high pressure (HTHP) filtration experiments. The Scanning electron microscopy (SEM) was used to prove that the permeability reduction rate is a scientific method to evaluate the sealing effect. (c) 2023 The Authors. Publishing services provided by Elsevier B.V. on behalf of KeAi Communication Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/ by-nc-nd/4.0/).