Publications

It was determined that the use of an azimuthal resistivity logging while drilling (LWD) tool in conjunction with a geosteering tool (instrumented motor) resulted in considerable efficiency gains while drilling the Widuri B-22 horizontal well. While the quality of the formation evaluation data improved, azimuthal measurements while rotating allowed for increased rotary drilling. In comparison with a traditional propagation resistivity tool and measurement while drilling, the combination of an instrumented motor and an azimuthal resistivity device can lead to optimal borehole placement, higher penetration rates, improved cuttings transport and enhanced borehole stability.Time was saved by the use of oriented logging data while sliding and continuous lookup/ lookdown for geosteering while rotating. The use of the Resistivity At the Bit tool (RAB - an azimuthal laterolog resistivity LWD tool) resulted in an almost 50% increase in the use of rotary drilling when compared to similar horizontal wells. This in turn led to an increased rate of penetration (ROP) and a cleaner and more stable hole.The use of real time dip from an azimuthal resistivity LWD tool aided YPF Maxus in positioning of a horizontal well in a fluvio-deltaic sandstone-shale sequence of the Talang Akar Formation. In the case of the RAB tool on YPF Maxus well Widuri B-22, this data was transmitted to surface at 6 bits per second in real time. Use of the inclination-at-bit measurement reduced hole tortuosity and further aided the control of the well trajectory. The use of azimuthal data from the LWD provided early detection of formation boundaries.