Publications

Seven vertical wells, aiming at the late Jurassic sand reservoir, were drilled in the Abadi field. In the past drilling campaigns, some of the wells encountered the drilling difficulties such as excessive drill string vibration and tight hole in the Woodbine group, the Tertiary carbonate formation. The excessive vibration caused the BHA twist-off in two wells. The tight hole, observed as frequent drags of the drill string, resulted in casing running problems in two wells.After reviewing the observation of the 3D seismic attributes around the wells, it is found that the zones of these troubles tends to located in karst, channel, fault and kink band near fault tip. Therefore, it is helpful to check not only variance (or coherence) attribute, but also dip, azimuth and its derivative ",dip across fault trend", attributes to make well trajectory keeping away from these geological features. It is expected to be helpful to plan more efficient and safer drilling in the Tertiary carbonate in this field.