Improving the rheological properties of water-based calcium bentonite drilling fluids using water-soluble polymers in high temperature applications
Author:
Liu Jinliang1, Zhou Fengshan1ORCID, Deng Fengyi2, Zhao Hongxing1, Wei Zhongjin1, Long Wenjun1, Evelina Amutenya1, Ma Cunfa1, Chen Sinan1, Ma Liang1
Affiliation:
1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes , National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing) , No. 29 Xueyuan Road, Haidian District , Beijing 100083 , P. R. China 2. Western Fieldsite Center , GreatWall Drilling Company, China National Petroleum Corporation , Panjin , Liaoning 124010 , P. R. China
Abstract
Abstract
Most of bentonite used in modern drilling engineering is physically and chemically modified calcium bentonite. However, with the increase of drilling depth, the bottom hole temperature may reach 180 °C, thus a large amount of calcium bentonite used in the drilling fluid will be unstable. This paper covers three kinds of calcium bentonite with poor rheological properties at high temperature, such as apparent viscosity is greater than 45 mPa·s or less than 10 mPa·s, API filtration loss is greater than 25 mL/30 min, which are diluted type, shear thickening type and low-shear type, these defects will make the rheological properties of drilling fluid worse. The difference is attributed to bentonite mineral composition, such as montmorillonite with good hydration expansion performance. By adding three kinds of heat-resistant water-soluble copolymers Na-HPAN (hydrolyzed polyacrylonitrile sodium), PAS (polycarboxylate salt) and SMP (sulfomethyl phenolic resin), the rheological properties of calcium bentonite drilling fluids can be significantly improved. For example, the addition of 0.1 wt% Na-HPAN and 0.1 wt% PAS increased the apparent viscosity of the XZJ calcium bentonite suspension from 4.5 to 19.5 mPa·s at 180 °C, and the filtration loss also decreased from 20.2 to 17.8 mL.
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Polymers and Plastics,General Chemical Engineering
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