Solutions and preventions of horizontal well problems

Abstrsct: Horizontal wells usually pass through long oil layers, with high production rate per well, but the drilling process is complex, leading to pipe freezing incidents. In the event of pipe freezing, improper handling may cause huge losses, so the safety of drilling is particularly important. Well Horse 2-1H is a horizontal well in Sichuan Tongnanba area, with the formation lithology of mainly sandy mudstone, black shale, and carbonaceous shale, so the mud making capacity is strong and the strata is unstable, prone to collapse and block dropping to make drilling difficult. The complex accident occurred in the process of horse 2-1H well drilling process is summed up. The reasons for the well underground complex issue are analyzed through formation lithology contrast, drilling fluid properties, BHA, etc. The experience of the incident handling is summarized, and the accident prevention measures of horizontal wells is studied, which has some significance for the safe drilling of horizontal wells, and provides some references for horizontal well drilling in the region.