Jing Ji Wang·2025-12-01 08:47Core Insights - China National Petroleum Corporation's Daqing Drilling achieved a significant technological breakthrough in coalbed methane exploration in the Ordos Basin, utilizing a self-developed pressure-maintaining coring tool to address coring challenges [1][2] - The Daqing Drilling team set four records in the Han Cheng block, including the highest cumulative coring depth per well, the highest core recovery rate at 98.38%, the most comprehensive coring layers, and the fastest mechanical drilling speed [1] - The successful implementation of a customized tool, refined processes, and comprehensive monitoring during the coring operation has provided critical geological data and technical support for coalbed methane exploration in the Ordos Basin [2] Group 1 - Daqing Drilling's new coring technology allows for the preservation of the original state of the reservoir, which is crucial for accurate evaluation of gas content and reservoir parameters [1][2] - The Daqing Drilling team formed a collaborative task force to address the complex geological conditions of the Hao 20 well, leading to targeted upgrades of the pressure-maintaining coring tool [1] - The core recovery rate exceeded design expectations by 18.38%, indicating the tool's effectiveness in high-pressure formations [1] Group 2 - The operational model developed by Daqing Drilling includes customized tools, refined processes, and full monitoring, achieving the technical goal of maintaining pressure during coring [2] - The drilling team optimized the well trajectory and adjusted drilling parameters to create a stable downhole environment for coring operations [2] - This technological advancement not only aids in precise resource evaluation but also enhances the optimization of development plans for coalbed methane [2]