Study on Artificial Filter Cake Evaluation Method of Oleophilic Nano-Plugging Agent

Feng Dai, Pingya Luo (), Chunlin Wu, Rui Wang, Yingmin Liu and Weian Huang
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Feng Dai: School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Pingya Luo: School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Chunlin Wu: Exploration and Development Department, Sichuan Changning Natural Gas Development Co., Ltd., Chengdu 610051, China
Rui Wang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Yingmin Liu: Exploration and Development Department, Sichuan Changning Natural Gas Development Co., Ltd., Chengdu 610051, China
Weian Huang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2023, vol. 16, issue 8, 1-11

Abstract: Oil-based drilling fluid is currently widely utilized when drilling shale, in which the oleophilic nano-plugging agent is the major component for wellbore strengthening. However, there have been few effective and straightforward evaluation methods for the nano-plugging agent. In this study, an artificial filter cake was created to simulate the microfissure of shale formation, and the performance of the nano-plugging agent was assessed using the fluid-loss reduction rate as the index. The filter cake was made from compound crystal weights and a high molecular weight polymer, and a nano-plugging agent matching the formation pore structures was selected. The performance of three plugging agents with varying particle sizes (ultrafine CaCO 3 , emulsified modified rubber MORLF, ULIA nano-plugging agent) was compared. Moreover, the validity of the evaluation process was confirmed, and the underlying plugging mechanism was investigated. The proposed technique can produce an artificial filter cake with a constant thickness of 3 × 10 −3 m and a permeability in the range of 10 −18 to 10 −19 m 2 , and the assessment approach is consistent, precise and easy to use. This work may provide a guideline for evaluating oleophilic nano-plugging agents in the laboratory and field applications.

Keywords: oleophilic nano-plugging agent; wellbore stability; sealing evaluation; artificial filter cake; complex barite (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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