Effects of Different Types of Weighting Agents on the Performance of Oil Base Drilling Fluids
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摘要: 油气井钻井成功在很大程度上取决于钻井液的性能,而加重剂对钻井液的性能有很大影响,不同加重剂配制的钻井液在现场钻进过程中效果不同。通过对毫微粉体、普通重晶石粉和微锰矿进行粒度分析,配制油基钻井液,测定钻井液的黏度、API滤失量、泥饼摩阻系数等性能,研究了不同加重剂对钻井液性能的影响。实验结果表明:毫微粉体的颗粒最小,配制的钻井液黏度最大,滤失造壁性差;普通重晶石粉配制的钻井液润滑性能不好,但受加量的影响小;微锰粉颗粒大,粒度分布广,与普通重晶石粉混合使用后钻井液的性能有明显提高。Abstract: The success of oil and gas well drilling depends to a large extent on the performance of drilling fluid, whichis greatly affectedby the weighting agent used. A drilling fluid weighted with different weighting agents will perform quite differently during drilling. In laboratory studies, a micron powder barite, a conventional barite and a micro powder manganese mineral used in formulating drilling fluid samples were analyzed for their particle sizes. The viscosity, API filter loss and friction coefficient of mud cake of the three drilling fluids were measured to study the effects of weighting agent on the performance of drilling fluid. It was shown that the micron powder barite had the finest particle sizes and the drilling fluid formulated with this barite had the highest viscosity, and mud cake of poor quality was formed. Drilling fluid formulated with the conventional barite had poor lubricity. The manganese mineral had bigger particle sizes and wider particle size distribution.A drilling fluid formulated with the manganese mineral and conventional barite had performance that was obviously improved.
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Key words:
- Weighting agent /
- Oil base drilling fluid /
- Filtration and mud cake quality /
- Lubricity /
- Rheology
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