Research and application of hot drilling out for coiled tubing in horizontal wells:a case study of XX Sag in HN Oilfield
In order to solve the problems of high well control risk,difficulty in wellbore cleaning,and easy sticking of drilling in pressurized drilling and bridging plug process of coiled tubing in horizontal wells,the difficulties in the construction of coiled tubing were analyzed,the selection of operating equipment and drill-ing tools was carried out,the closed cycle surface process was improved,and the structural design and tech-nical parameters of drilling plugs were optimized.A new idea of combining the two working fluids was pro-posed,which was applied in Y1 well,a risk pre-exploration well in HN Oilfield,achieving a breakthrough in various construction data such as high wellhead pressure control,long horizontal section of drilling and sweeping,and large number of plugs in a single run,and establishing a technical process of braising and dissolving plugs-small nozzle blowout-hot drilling out for deep shale oil wells in XX Sag,HN Oilfield,which provides a good technical support and reference for similar operations in the future.
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