The exploration degree of Hongxing area in western Hubei-eastern Chongqing is low, and there are some unfavorable conditions such as thin thickness of high-quality shale reservoir, rapid change of lateral stratigraphic occurrence, and poor contrast, which pose challenges to the geosteering technology. To ensure that the shale gas horizontal wells in this area can effectively penetrate high-quality gas reservoir, this study started with the geological characteristics of the target layer of the the Permian Wujiaping Formation in the Hongxing area, analyzed the main challenges faced by the geosteering. A series of targeted technical solutions were proposed, such as using 3D geological modeling to track while drilling, determining guiding marker layer (point), optimizing the steering tools, and optimizing the control of the steering trajectory while drilling. The first established trajectory control calculation model of average angle method and the segmental control chart of marker layer (point) and well inclination under different slope constraints have solved the problems of large error in target prediction and poor trajectory control effect by using the equal thickness method alone, and significantly improved the accuracy of target prediction and trajectory control. The average drilling rate of high-quality shale reservoir is 93.0% and the drilling speed is 29.7% through the application of 8 wells, and the purpose of effectively improving the drilling rate of reservoir and optimizing and fast drilling has been realized.
冯亦江,赵红燕,石文睿,等. 鄂西渝东红星地区地质导向关键技术研究与应用[J]. 科学技术与工程, 2023, 23(30): 12883-12891.
Feng Yijiang, Zhao Hongyan, Shi Wenrui, et al. Research and application of key geosteering technology in Hongxing area, western Hubei-eastern Chongqing[J]. Science Technology and Engineering,2023,23(30):12883-12891.