Determination of Borehole quality, Diameter and BHA Directional Response: Eccentric Tool Test Program for Expandable Casing Application North Sea

摘要

A detailed test program was performed with an eccentric tool at the Baker Hughes Experimental Test Area (BETA) field research facility to evaluate the feasibility of its use in an Expandable Tubular Technology application in the North Sea. The tesitng used a 9-7/8" Drill Out Steerable Ream While Drilling (DOSRWD) tool in conjunction with 6-1/2" pilot bits (both PDC and roller cone). Motor bent housing settings included 1.0 deg, 1.5 deg, 1.75 deg and 2.0 deg bends to evalaute directional and stability response. Surface speeds were varied from 0, 35, 50 and 75 rpm at each motor housing setting. Caliper logs including four and six-arm and ultrasonic borehole imaging (UBI) tools were used to characterize the borehole under all conditions. The analysis included directional tendencies, down hole vibration monitoring and borehole diameter, quality and degradation over time. The test results shwo the 9-7/8" DOSRWD system is capable of providing the high quality wellbore required for expandable tubular technology, ensuring the casing can be run, expanded and isolated across the formation.