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The First Application of Seismic While Drilling Technology in HTHP Offshore Exploration Well of South China Sea

机译:南海HTHP海上勘探井钻探技术的第一次应用

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D block in the South China Sea is challenging to drill due to both high temperature and high pressure(HTHP)concerns. Well D2 is a wild-cat exploration well in this HTHP area. The target formation is HTHP and the safe mud window is narrow. To drill safely,it is required to predict target zone depth accurately and monitor pore pressure ahead of bit while drilling. Seismic-While-Drilling(SWD)technology was evaluated and applied for the first time in the D2 well of the South China Sea. In this well,with the checkshot data and seisimic waveforms from SWD,an integrated solution was provided,including updates of the time-depth relationship,depth prediction for the highpressure problem formations,pore pressure monitoring and updated prediction ahead of the bit. All results were updated in real-time while drilling,helping to optimize the mud weight in a tight mud window scenario and to determine the final target depth of the open hole section and the casing depth. The real-time and memory waveforms were processed and the resultant corridor stack was compared with surface seismic section for marker correlation. The predicted depth of the high pressure zone estimated from the SWD udpates was within 3 meters of the actual depth from drilling data. Pore pressure and fracture gradient were also estimated in real-time with SWD data and the results were found to be consistent with the pore pressure measurement from wireline formation tester,obtained post drilling. By using the real-time target zone depth prediction and abnormal high pore pressure predictions based on SWD data,the D2 well was successfully completed without severe drilling issues. The casing was set to the proper depth which formed a solid foundation for the safe drilling of the next openhole section. This case study is the first application of SWD in the sediments of the South China sea,especially within an HTHP environment. The results clearly show the effecacy of SWD in this specific geological environment.
机译:由于高温和高压(HTHP)问题,南海的D块充满钻探。嗯D2是这个HTHP地区的野生猫探索。目标形成是HTHP,安全泥窗是狭窄的。为了安全地钻钻,需要准确地预测目标区域深度,并在钻孔时监测前方的孔隙压力。在南海D2井中首次评估和应用地震钻孔(SWD)技术。在此嗯,通过来自SWD的检查表数据和来自SWD的SEISIMIC波形,提供了一种集成解决方案,包括更新的时间深度关系,对高压问题的深度预测,钻孔压力监测和更新预测。钻孔时,所有结果都是实时更新的,有助于优化紧密泥窗场景中的泥浆重量,并确定开孔部分的最终目标深度和壳体深度。处理实时和内存波形,并将所得走廊堆与表面地震部分进行比较,用于标记相关性。从SWD UDPates估计的预测深度在钻孔数据的实际深度的3米范围内。孔隙压力和骨折梯度也与SWD数据实时估计,结果被发现与从有线形成测试仪的孔隙压力测量一致,获得钻孔后钻孔。通过使用基于SWD数据的实时目标区域深度预测和异常高孔隙压力预测,D2井在没有严重钻井问题的情况下成功完成。将壳体设定为适当的深度,该深度形成了固体基础,用于安全钻孔的下一个透露孔部分。本案例研究是SWD在南海沉积物中的第一次应用,特别是在HTHP环境中。结果清楚地显示了这种特定地质环境中SWD的效果。

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