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Rheological properties and damage-control mechanism of oil-based drilling fluid with different types of weighting agents

机译：不同类型增重剂的油基钻井液的流变特性及破坏机理

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摘要

The great amount of solid particles contained in a weighting agent is a major cause of the problems in both rheology properties and damage control mechanism of an oil-based drilling fluid (OBM). Therefore, a proper type of weighting agent can be a solution for the application of OBM. In this study, three weighting agents that have been commonly used with OBM, namely, standard barite, submicron barite and superfine manganese ore, are studied. Rheological properties of OBM and the degree of formation damage are assessed with regard to the three weighting agents. The agents are also studied in aspects of particle size, micromorphology, filtration loss and wall-building property, acid dissolution efficiency of mud cake, lubricity and sedimentation stability to analyse the effects of the agents on rheological properties and the degree of damage as well as to figure out the mechanism of rheology control and damage control. For the OBM, there is a mutual effect between rheological stability and the degree of damage. In consideration of the agents' properties, we can enhance the rheological stability of the OBM and control the degree of formation damage by properly selecting particle size, using acid-soluble materials and forming the mud cake with ultra-low permeability that can easily be cleared away.
机译：增重剂中包含的大量固体颗粒是油基钻井液（OBM）的流变性和破坏控制机理方面均存在问题的主要原因。因此，合适类型的增重剂可以是用于OBM的解决方案。在这项研究中，研究了OBM常用的三种增重剂，即标准重晶石，亚微米重晶石和超细锰矿。关于三种增重剂，评估了OBM的流变性质和地层破坏程度。还从粒度，微观形貌，过滤损失和墙体构造性能，泥饼的酸溶解效率，润滑性和沉降稳定性等方面研究了该试剂，以分析该试剂对流变性能和破坏程度以及找出流变控制和破坏控制的机理。对于OBM，流变稳定性和破坏程度之间存在相互作用。考虑到试剂的性能，我们可以通过适当地选择粒径，使用酸溶性材料并形成易于清除的超低渗透性泥饼，来提高OBM的流变稳定性并控制地层破坏的程度。远。

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