Study on oil-based drilling fluid gravity displacement experiment
Carbonate rock formation has good connectivity,more developed cracks and karst cave for-mation,gravity displacement overflow often occurs,overflow and leakage coexist,it is difficult to deal with.In some blocks,the gravity displacement overflow of oil and oil-based drilling fluid often leads to the reduction of drilling fluid density,which cannot balance the bottom pressure,resulting in malignant o-verflow accidents.In order to deal with overflow accidents in time and realize safe drilling,it is necessary to master the mechanism of formation gravity replacement between oil and oil-based drilling fluid,and guide the site to handle gravity displacement overflow from the theory.Therefore,based on the self-de-veloped gravity displacement experiment of the wellbore-fracture-formation gravity displacement exper-imental device,and the oil-based drilling fluid cannot balance the oil-based drilling fluid,it is found to affect the drilling process,the experiment has guiding significance for the treatment of gravity displacement overflow.
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