Application of large hole deep drilling technology in X oilfield of Bohai Sea
The X structure of Bohai Sea belongs to the normal pressure formation.The strata of Minghuazhen and Guantao formations in Well 1 and Well 2 are prone to shaft wall instability due to the concentrated in-situ stress.Based on the analysis of well structure design optimization,bentonite deep drilling technology and drilling fluid performance optimization,this technology has achieved good results in the actual drilling of 3 Wells,which can reduce the complexity of the operation,achieve the purpose of shortening the drilling cycle and improving the mechanical drilling rate.The drilling time of 3 Wells is increased by 20.70%compared with that of 1 well,providing a reference for the subsequent exploration drilling operations in this block.
Ground stress concentrationWell wall instabilityDrilling cycleRate of penetration
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万方数据
