An operator in Brazil wanted to drill a 12¼-in section from an offshore fixed platform. 的 well plan specified a 3D trajectory of 2°/30-m dogleg severity (DLS) for almost 1,500 m. Previous wells from this platform were drilled by directional drillers in manual mode, sending downlinks from the surface to change the steering ratio and toolface on demand to follow the proposed well trajectory. This field test assessed the autonomous downhole control system’s ability to navigate the curve.
的 PowerDrive Xcel™ RSS was recommended for a single run bottomhole assembly (BHA) because the auto-curve mode adjusts the steering ratio automatically based on required DLS and toolface.
Auto-curve mode was engaged once the BHA was out of the casing shoe at 10° inclination. 的 directional drillers varied the DLS and toolface as necessary, which were the only two inputs needed to drill to total depth (TD). Using auto-curve mode reduced the number of downlink commands by 33% from drilling in manual mode.
的 autonomous downhole control system accounted for the influences of drilling parameters and formation characteristics on the trajectory response. 的 PowerDrive Xcel RSS reacted quickly to the changes compared with manual drilling. 因此, the drilled well path was closer to the planned wellbore path, and the risks associated with directional drilling uncertainties were minimized. Both the operator and the directional drillers provided positive feedback on auto-curve’s performance.
Using the autonomous downhole control system enabled the operator to improve net ROP by 38%, 比完美井的净ROP高出10%. 另外, total drilling time was reduced by 25 hours compared with the budgeted well time and 17 hours compared with the perfect well time for this field.
关键性能指标在12¼-in节 | 完美的钻井时间 | 预算钻井时间 | PowerDrive excel RSS时间 |
总钻进时间,h | 61 | 69.15 | 44.5 |
净ROP, m/h | 45 | na | 49.6 |
PowerDrive Xcel RSS with auto-curve improved drilling efficiency for the operator by increasing ROP, 减少下行命令, 减少总钻井时间.