Recently, significant progress has been made in the shale gas survey in western Hubei. Through coordinated deployment and collaborative efforts by the China Geological Survey of the Ministry of Natural Resources and the Hubei Provincial Geological Bureau, among other units, focusing on the Permian shale formations in Enshi, western Hubei, a breakthrough in industrial gas flow has been successfully achieved.

In the Enshi area of Hubei, the horizontal well E-E-2HF conducted fracturing and gas testing in the Permian Dalong Formation, yielding a daily gas production of 50,600 cubic meters, expanding the exploration of new layers in the Dalong Formation; the vertical well E-He-3 in the Hefeng area conducted fracturing and gas testing in the Permian Qixia Formation, achieving a daily gas production of 10,700 cubic meters, pioneering new layers and types of unconventional gas, and effectively extending shale gas exploration from the Sichuan Basin to western Hubei.

This achievement further enriches and refines the theory of marine unconventional gas accumulation in complex structural areas, establishing a marl gas accumulation model of "integrated source and reservoir, structural preservation controlling accumulation, and fractures-pores determining richness", which holds significant scientific guidance value for exploration in similar regions. Additionally, addressing the challenge of fracturing fluid flowback in normal-pressure shale gas, the project team innovatively developed a gas testing and flowback process of "electric submersible pump + gas lift + foam drainage composite string drainage + intelligent monitoring", successfully achieving efficient flowback in the E-E-2HF well, providing key technical support for the economical and effective development of normal-pressure shale gas.

Currently, the project has identified one favorable area for shale gas in the Permian Dalong Formation and one favorable area for marl gas in the Qixia Formation, submitted one proposal for the Enshi East shale gas exploration block, and added 132.95 billion cubic meters of shale gas geological resources, further solidifying the resource foundation for the shale gas succession base in western Hubei.

The accumulation theory and efficient flowback technology developed from this achievement will play a crucial guiding role in the deployment of shale gas exploration in complex structural areas, demonstrating significant theoretical value and engineering practical significance.

From:SunSirs