Abstract
One of the most application of the directional drilling is drilling multiple wells from one location or platform. In drilling multiple wells from one location the major problem that faced is avoiding the collision with the offset wells that drilled near the proposed well in the same region. Therefore, the Potential of Collison between the wells can cause severe catastrophic accidents such as an explosion or oil spill. Several measurements of proximity calculation or methods have been adopted to control the distance between the wells, avoid the Collison, increas-ing the clearance along with smoothing the trajectory, Reducing the drilling time based on the anti-collision rules. A real case study of an offshore directional horizontal well drilled from the platform is studied through the paper. The proposed well is drilled in the neighboring of three Offset wells that should be Planned completely to avoid the Collison with them. The well is planned through an advanced anti-collision method that results in preventing the collision of well with optimized drilling performance through Oriented separation factor (OSF). This factor yields appropriate separation with OSF greater than 5. This yield efficient separation with offset well 1, offset well 2 and offset well 3 greater thant5, In addition to optimized drilling performance of 84% drilling versus 16% sliding that results in the completion of the well in 50 days with positive income that result in 8.55 Return on Investment (ROI).  Â
Highlights
Directional drilling is one of the most challenging and attractive techniques that help to solve many problems that vertical drilling cannot solve as drilling multiple wells from the same location in offshore drilling instead of having a platform for each well [1]
This result indicates good drilling performance as the rotation is greater than sliding due to the sliding cause more friction force on the drill string, cause limitation of the weight on the bit which results in lower ROP
The anti-collision summary shows that the well is entered only the alert zone and redesign the plan to exit from the alert zone to drill safely and avoid the collision of the offset wells
Summary
Directional drilling is one of the most challenging and attractive techniques that help to solve many problems that vertical drilling cannot solve as drilling multiple wells from the same location in offshore drilling instead of having a platform for each well [1]. The distance between the center of the offset and subject well must be calculated in order to avoid the collision by an offset well [2] This can be achieved by accurate well planning taken into consideration separation from the offset wells. Gathering accurate information about the offset wells in the same working area is significant for avoiding the collision and for the future well planning [7]. Another method than the calculation of the distance between the wells is to graph the subject well along with offset wells to control the collision in real-time [8]
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