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Thermal stability of xanthan gum biopolymer and its application in salt-tolerant bentonite water-based mud

  • Zhifei Zou , Qingcheng Zhao , Qingying Wang and Fengshan Zhou EMAIL logo
Published/Copyright: May 16, 2019
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Abstract

Xanthan gum from Xanthomona campestris (XC) is a chain-like polysaccharide biopolymer with good salt tolerance. The temperature resistance of XC seriously affects its application in drilling fluids. Results have shown that when the temperature of the XC solution rose to 120°C, after several hours the shear stress of the XC solution was almost 0 mPa · s at different shear rates. In this study, the molecular structure of XC was enhanced by crosslinking with chromic oxalate and borax and then adding sodium sulfite to further enhance the temperature resistance of the gum. Selected materials such as MgO, layered double-hydroxide, attapulgite, and asbestos fiber were added as shearing resistance reagents. Through continuous experimentation, the amounts of the reagents were optimized. After 120°C aging test, the drilling fluids of modified XC (MXC) could still maintain good rheological properties and low fluid loss. The application in China Dagang oilfield indicated that 0.019 w/v% MXC could improve the yield point from 6.5 to 8 Pa. MXC could also be used in bentonite to prepare salt-tolerant bentonite, which was successfully used in offshore exploration and construction engineering.

Award Identifier / Grant number: 2016ZX05040-005

Award Identifier / Grant number: P18048-2

Funding source: Central Universities

Award Identifier / Grant number: 2-9-2017-390

Award Identifier / Grant number: 2-9-2017-353

Award Identifier / Grant number: 2-9-2017-399

Funding statement: This work was supported by the National Science and Technology Major Projects of China in the 13th Five-Year Plan (grant 2016ZX05040-005), the Key Science and Technology Projects of Sinopec Group (P18048-2), the Fundamental Research Funds for the Central Universities (nos. 2-9-2017-390, 2-9-2017-353, 2-9-2017-399). The authors thank Dr. Hoping Sun, Senior Specialist in drilling fluid services, Canadian Petroleum corporation, Schlumberger, and Saudi Aramco, for technical review and language polishing.

  1. Conflict of interest: The authors declare no conflicts of interest regarding this article.

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Received: 2019-01-16
Accepted: 2019-03-26
Published Online: 2019-05-16
Published in Print: 2019-07-26

©2019 Walter de Gruyter GmbH, Berlin/Boston

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