含煤地层封堵抑制型钻井液添加剂的研究  

Study on inhibited plugging additives of drilling fluid for coal-bearing strata

作　　者：韦猛[1] 曾一芳 朱金勇 明俊男 WEI Meng;ZENG Yifang;ZHU Jinyong;MING Junnan(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;Sichuan Chuanjian Geotechnical Survey and Design Institute,Chengdu 610017,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]四川省川建勘察设计院,四川成都610017

出　　处：《煤田地质与勘探》2018年第6期212-216,222,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41572358)~~

摘　　要：含煤地层,裂隙发育且复杂多变,在钻进过程中事故频发。针对这一现象,首先从含煤地层微观形貌分析入手,发现含煤地层存在大量微裂缝,且裂缝中多为水敏膨胀型充填物,易导致含煤地层失稳。采用降低钻井液滤失、封堵抑制水分侵入含煤地层的思路,通过理论与实验相结合的方法,优选出具有增黏兼降滤失作用的高聚物黄原胶XC,能封堵地层孔隙的超细惰性材料纳米二氧化硅、超细碳酸钙3种添加剂。通过室内实验分别测试出了加入不同剂量(质量分数)添加剂对钻井液的流变、滤失性能等参数,将实验数据整理分析,发现钻井液的性能参数随这3种添加剂剂量变化的规律。通过膨胀实验佐证了XC聚合物钻井液体系的抑制效果,并从微观结构的角度阐述了这3种添加剂的作用机制。研究成果对含煤地层的钻进提供了理论依据,同时在类似含煤地层的钻进中具有一定的参考价值。The fractures develop,are complex and variable in coal-bearing strata,accidents occur frequently during drilling.As for this phenomenon,this paper worked from the analysis of microstructure of strata,and it was found that in the coal measures exist a large number of micro cracks containing plenty of wat er-sensitive inflating fillings,easily leading to the instability of coal measures.The use of Xanthan XC to reduce filtration loss and the use of u ltra-fine inert material to seal the pores of coal-bearing strata and reduce permeability can reach the effect of blocking water intrusion into coal strata.Therefore,the additives of inhibitory drilling fluid system were an alyzed and sifted by combining theories and experiments.The rheological and filtration properties of base slurry were tested by laboratory experiments in which different dosages of high polymer Xanthan XC,ultrafine inert material Nano silica and superfine calcium carbonate were added.With the analysis of the experimental data and simulation r esults,the rules were found about how the performance parameters of slurry change with different dosages(mass fraction)of XC,nano silica and superfine calcium carbonate added.The inhibition effect of XC polymer drilling fluid system was supported by expansion test and the mechanism of action of the three kinds of additives is explained from the perspective of microstructure.The research results provide a theoretical basis for the drilling of coal-bearing strata,and have certain reference value in the drilling of other strata which are similar to coal-bearing strata.

关 键 词：含煤地层 超细惰性材料 高聚物 钻井液 微观形貌 机制 

分 类 号：P634.5[天文地球—地质矿产勘探]