与会专家听取了该技术汇报，审阅了相关材料，经质询、讨论，一致认为《动水砂化区斜井溃涌灾变机理与协同控制关键技术》在曹家滩煤矿主、副斜井的应用中取得了显著成效，经过治理，主副斜井总涌水量由350m?/h降低至39m?/h，降幅近90%，有效封堵了砂化段涌水，消除了斜井壁后水流携砂致灾隐患，确保了矿井主运煤系统及辅运输的安全运行，为曹家滩煤矿的安全生产奠定了坚实基础。也为我国西北地区类似地质条件下的斜井井筒过砂化段突水溃砂问题提供了有力的理论、实践支撑。同意通过鉴定，其成果在动水砂化区控制技术方面达到国际领先水平。

据悉，该技术主要针对砂化地层中动水治理的难题，通过深入研究斜井优势管流通道的扩展机制以及壁后空腔的形成原理，揭示了应力水力耦合作用下井壁失稳与溃涌灾害的内在机理。在此基础上，项目团队提出了基于井壁——水——砂一体化协同控制的创新方法，有效解决了动水砂化区的治理难题。该项目团队还研发了高风压旋喷分区分段冲洗技术，厚砂化层分段帷幕侯凝多序注浆工艺与动水砂化区斜井循环泥浆携石注浆帷幕技术及融合井壁稳定性与水砂运移的多元信息检测与预警技术。这一系列创新技术使得井筒壁后的空腔和空洞得以密实填充，有效遏制了涌水携砂现象，显著提高了井筒的安全性。

Recently, the China National Coal Industry Association organized relevant experts in Beijing to identify the "Mechanism of inclined well collapse disaster and Key technologies for collaborative control" jointly developed by Shaanxi Coal Bed Methane Company and Shaanxi Coal Caojiatan Mining Company. The appraisal meeting was chaired by Professor Zhou Jinsheng, senior expert of China Coal Industry Association, Wang Shuangming, academician of Chinese Academy of Engineering, and Wang Jiachen, professor of China University of Mining and Technology (Beijing), seven industry experts attended the meeting.

The experts attended the meeting listened to the technical report, reviewed the relevant materials, and after questions and discussions, they agreed that the "Mechanism of inclined shaft collapse disaster and Key technology of Collaborative Control in the moving water sand mineralization Area" has achieved remarkable results in the application of the main and auxiliary inclined shafts of Caojiatan Coal Mine, and after treatment, the total water inflow of the main and auxiliary inclined shafts has been reduced from 350m to 350m. /h reduced to 39m? /h, the reduction of nearly 90%, effectively blocked the water gushing in the sand section, eliminated the potential disaster caused by water carrying sand behind the inclined shaft wall, ensured the safe operation of the main coal transport system and auxiliary transportation of the mine, and laid a solid foundation for the safe production of Caojiatan Coal mine. It also provides a powerful theoretical and practical support for the problem of water burst sand in the inclined shaft sanding section under similar geological conditions in northwest China. It is agreed that through the appraisal, the results have reached the international leading level in the control technology of moving water sand processing area.

It is reported that this technology is mainly aimed at the problem of dynamic water management in sanded formation, and through in-depth research on the expansion mechanism of the advantageous pipe flow channel in inclined Wells and the formation principle of the cavity behind the wall, the internal mechanism of wellbore instability and collapse disaster under the action of stress hydraulic coupling is revealed. On this basis, the project team proposed an innovative method based on the integrated collaborative control of borehole wall-water-sand, which effectively solved the management problem of the moving water sanded area. The project team also developed the high wind pressure rotary jet zone sublevel washing technology, the thick sand layer sublevel solidification multi-sequence grouting technology, the inclined shaft circulating mud carrying stone grouting curtain technology in the moving water sand area, and the multi-information detection and early warning technology combining the stability of the shaft wall and the movement of water and sand. This series of innovative technologies enables the cavity and void behind the borehole wall to be filled tightly, effectively preventing water gushing and sand carrying, and significantly improving wellbore safety.