黄河口凹陷复杂断块油气田水平井着陆技术

Landing Technology of Horizontal Well in Complex Fault Block Oil and Gas Field in Huanghekou Sag

摘要: 黄河口凹陷主要在产油气田大多位于明化镇组明下段(N1ml)的复杂断块。为了提高采收率，获得更大的产出剖面和供给范围，该类油气田的开发井、调整井大多设计为水平井。安全高效成功地实施水平井着陆对于该类油气田开发生产至关重要。黄河口凹陷N1ml为浅水三角洲沉积，储层厚度薄且受断层复杂化作用明显，导致水平井着陆作业难度加大。主要问题有着陆目的层预测精度有限；受随钻测井工具限制，井底存在盲区；一旦需要调整，井轨迹调整空间有限。为此，应用了现场快速精细对比及预测技术、随钻测井盲区综合录井先锋导向技术、合理平滑化轨迹控制着陆技术等一系列技术组合，在水平井着陆现场作业中获得了显著效果，研究区N1ml复杂断块油气田水平井着陆成功率由此前的85%提高至100%，实现了提质增效，且具有良好的推广应用前景。

Abstract: The oil and gas production fields in Huanghekou Sag were mostly complex faulted block reser-voirs in the Lower Member of Minghuazhen Formation (N1ml). The development wells and infilled wells were mostly horizontal ones in order to improve oil recovery, obtain larger producing profile and increase the fluid supply zones. Safe and efficient horizontal well landing was of critical importance to the development of this type of reservoir. N1ml in Huanghekou Sag was shallow water delta sediment; thin and complicated reservoir was induced by faults, which caused great challenge to the horizontal well landing. The main difficulties in horizontal well landing include: 1) the limitation of prediction accuracy of landing target zone, 2) blind zone existed in the bottom well because of the limitation of to LWD tools, and 3) limited space for trajectory adjustment. In order to overcome the above mentioned difficulties, an innovative technique combination of fine and quick correlation and predication onsite, pioneering mud logging steering in LWD blind zone and landing by proper trajectory smoothening, are used. Good application effect is achieved, and the success rate of landing in the faulted block of N1ml is improved from 85% to 100%. The technique can be further promoted to other oil fields.