Study on modification of plant gum flushing fluid in coal-bearing strata and its mechanism

Authors

XIE Chengchao, State Key Laboralory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, ChinaFollow
WANG Sheng, State Key Laboralory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, ChinaFollow
YAN Peng, Bazhong Bureau of Natural Resources and Planning, Bazhong 636600, China
CHEN Liyi, State Key Laboralory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China
LI Bingle, State Key Laboralory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China
ZHANG Jie, State Key Laboralory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China

Abstract

To improve the adverse effects of the depletion of plant gum resources on the application of flushing fluid in complex strata such as coal-bearing strata, a study was conducted on the compound and crosslinking modification of guar gum. A new type of plant gum flushing fluid (GXB) was developed using xanthan gum as the compound synergist and organic boron as the crosslinking modifier, with cross-linking control agent and inorganic treatment agent as the supplementary. Meanwhile, a series of performance evaluation was carried out. The evaluation results show that GXB has excellent performance and can meet the requirements of drilling in complex strata such as the coal-bearing strata. In addition, the mechanism of its compound-crosslinking modification was analyzed with the infrared spectrum analysis, viscosity analysis and nuclear magnetic resonance analysis in combination. The results show that: (1) There are two mechanisms of action in the process of compound synergism. Firstly, the galactose-free regions in guar gum could form hydrogen bonds with xanthan gum molecules or van der Waals forces to form a three-dimensional network structure to increase the viscosity. Secondly, the xanthan gum is prone to self-association under the action of guar gum to improve the structural viscosity of the system. (2) The viscosity of the system is further improved by the cross-linking reaction of borate ions in organic boron by complexing the hydroxyl group on galactose. The process can be divided into four stages: the initial stage, the transitional stage, the ascending stage and the stable stage. Besides, the speed of the cross-linking reaction in each stage is mainly affected by the release rate of borate ions by the organic ligand. Generally, the research results provide a new solution to solve the problem of coal-bearing strata collapse and have a certain reference value for the study on modification of plant gum flushing fluid.

Keywords

plant gum flushing fluid, guar gum, xanthan gum, compound synergism, organic boron crosslinking, coal-bearing strata

DOI

10.12363/issn.1001-1986.22.10.0823

Recommended Citation

XIE Chengchao, WANG Sheng, YAN Peng, et al. (2023) "Study on modification of plant gum flushing fluid in coal-bearing strata and its mechanism," Coal Geology & Exploration: Vol. 51: Iss. 6, Article 21.
DOI: 10.12363/issn.1001-1986.22.10.0823
Available at: https://cge.researchcommons.org/journal/vol51/iss6/21

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