| The southeastern region of Chongqing is rich in coal mine resources and has high potential for the development of mid to deep coalbed methane. At present, the development of this block is still in the exploratory stage, and there are problems such as high difficulty in reservoir transformation, unclear drainage system, unclear understanding of desorption laws, and difficult estimation of development benefits. Moreover, the production reference significance of the ultra deep coalbed methane well NY1 deployed in the early stage of this block is limited. To this end, geological modeling and screening were conducted on the drilling and logging data of the drilled old wells, and the Longtan Formation was selected as the development test object for Well D1. The innovation experiment focused on the "far support" core concept of a large displacement, large liquid volume, large sand volume, and multiple rounds of "effective support" fracturing technology system, combined with the "fast discharge up production - reaching production and stabilizing pressure" drainage work system, to improve the efficiency of gas well development. The results show that fracturing significantly improves the reservoir conductivity, and gas can be seen immediately after fracturing. With rapid flowback, the gas volume is gradually rising and stabilizing at more than 5000m3/day. D1 well has achieved a breakthrough in the successful development of mid to deep coalbed methane wells in the southeastern region of Chongqing due to its "short gas cycle", high yield, and stable production. This demonstrates the good development potential of coalbed methane in the area and has high guidance and reference value for the formation of supporting development technology systems. |
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