Progress and prospects of drilling and completion technologies for stabilizing and increasing production in Bohai Oilfield
During the production process,Bohai Oilfield faced many challenges,such as tight well slot resources,restrained reservoir production capacity release,and intensified high water cut in water flooded reservoirs.Through technical research and engineering practice,a production-enhancing drilling and completion technology system had been develped in Bohai Oilfield,characterized by efficient utilization of well slots and wellbore,offshore hydraulic fracturing,and efficient water control technology for flooded reservoirs.The main technical achievement indicators include:The full angle change rate of medium and short radius sidetracking technology reached up to 18.97°/30 m,and the blind spot of near-bit inclination measurement was shortened from 23 m to 0.6 m,overcoming the technical bottleneck;The fracturing and packing technology enabled a single six-layer fracturing and packing operation within the 177.8 mm casing,surpassing the operational limit;The integrated technology innovation of packing adaptive sand control and water control adopted a structure of"double layer screen tube,inner layer base tube without drilling",achieving the dual goals of water control and sand control.Faced with the engineering and technical challenges in the future,it is recommended to continue to tackle key issues in shallow water wellhead mining mode,refined and controllable ultra-short radius sidetracking technology,large-scale offshore fracturing operation mode,and multi-disciplinary collaborative water control mode to provide technical support for achieving stable and increased production targets in Bohai Oilfield.
Bohai OilfieldDrilling and completionWell slot resourcesWater controlFracturing
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