随钻边界探测技术在南海西部H井地质导向中的应用

Application of Boundary Detection Technology While Drilling during GeoSteering of Well H in the Western South China Sea

王光 郭增强 李茂文 唐宇

WANG Guang GUO Zengqiang LI Maowen TANG Yu

中海石油（中国）有限公司湛江分公司，广东湛江　524057 中海石油（中国）有限公司海南分公司，海南海口　570300

CNOOC China Limited Zhanjiang Company, Zhanjiang, Guangdong 524057, China CNOOC China Limited Hainan Company, Haikou, Hainan 570300, China

南海西部Z油田储层普遍存在物性差、构造精度低、砂体尖灭等复杂情况，为有效提高H井钻遇率和地质储量动用程度，引进了随钻边界探测技术。该技术不仅能测量三层模型的地层电阻率、钻头与上/下围岩以及储层边界的距离，还可进行边界地层刻画并提供地质导向服务，已被广泛应用于构造落实程度低、储层非均质性强、边/底水油藏等海上复杂油气田水平井开发。该文简述了地质导向技术的发展现状，梳理了随钻边界探测技术原理和技术特点，并实例展示了如何通过识别出的储层边界及储层变化结果调整井眼轨迹的过程。随钻边界探测技术增加了H井水平段轨迹在“甜点”储层中的穿行距离，导向应用效果良好，实际产量超出钻前配产约60 m3/d，同时能规避地质和工程风险，对后续同类油气藏水平井钻井具有指导意义。

The reservoirs of the Z oilfield in the western South China Sea generally have complex conditions such as poor physical properties, low structural accuracy, and sand body pinching out. Boundary detection while drilling was introduced to effectively improve Drilling Ratio and Reserve Utilization. This technology can measure three-layer model formation resistivity, distance from drill bit to upper/lower surrounding rock and reservoir boundary. It can also perform boundary strata characterization and provide Geosteering services. Boundary detection while drilling has been widely used in complex offshore oil and gas fields development, ecpecially in fields with conditions of low proven structure, strong reservoir heterogeneity, and edge/bottom water reservoirs. This paper briefly describes the development of Geosteering technology, sorting out the principle and technical characteristics of boundary detection while drilling, and demonstrates the methods to adjust the wellbore trajectory through identified reservoir boundary and reservoir change results. Boundary detection technology increases the travel distance of the trajectory of the horizontal section of Well H in the "sweet spot" reservoir, achieving a good steering application effect. The actual production exceeds the pre-drilling allocation by about 60 m3/d. At the same time, it avoids geological and engineering risks and can be used as guidance for subsequent drilling of horizontal wells in similar oil and gas reservoirs.

中海石油（中国）有限公司重大科技项目“南海西部油田上产2000万方关键技术研究”（编号: CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ）

https://doi.org/10.3969/j.issn.1008-2336.2022.04.057