洛河组砂岩新型无固相冻胶注浆体系研究
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中国石油大学华东

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山东省泰山学者攀登计划项目(tspd20161004)


Study on a Noval Solid-free Polymer Gel System for Grouting in Luohe Formation Sandstone
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China University of Petroleum East China

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    摘要:

    洛河组砂岩采动地层涌水频繁,严重影响了矿井安全生产。针对传统注浆体系面临渗滤效应严重和成胶性能不可控,难以实现裂隙出水有效调控的技术难题,通过分析典型岩心样品的矿物组成及微观形貌,明确了孔隙微观赋存特征,构建了低成本、稳定性优异的无固相冻胶注浆体系,进一步开展了注浆性能评价,结果表明:孔隙直径小和孔喉连通性差是造成传统注浆体系难以顺利注入和深部运移的地质原因;构建的低成本、无固相、易深部注入的新型冻胶注浆体系能够实现48h内成胶,长期老化稳定性优异;体系注入性良好,持续冲刷后压力衰减不明显,封堵率保持在80%以上;体系通过占据大孔道或裂缝空间,增大渗流阻力,迫使后续流体转向,实现出水层有效封堵。研究成果可为洛河组砂岩注浆堵水施工提供新思路。

    Abstract:

    The frequent water gushing in sandstone mining strata of Luohe Formation has seriously affected the safety production of the mine. The traditional grouting systems are faced with the problems of serious percolation effect and uncontrollable gelation performance, which is difficult to achieve effective regulation of fissure water. In this work, the microscopic characteristics of sandstone pores are clarified by analyzing the mineral composition and microscopic morphology of typical core samples. A solid-free polymer gel system with low cost and excellent stability is constructed for grouting, and the grouting performance evaluation is further carried out. The results show that the small pore diameter and poor connectivity are the geological reasons for the difficulty of smooth injection and long-distance migration of the traditional grouting systems. The noval polymer gel system with low cost, solid-free and easy injection for grouting can achieve gelation within 48h and has excellent long-term aging stability. The system has good injectivity and the pressure attenuation is not obvious after continuous flooding, with the plugging ratio remaining above 80 %. The system increases the seepage resistance and blocks the subsequent fluid by occupying the large channel or fracture space, which realizes the effective plugging of the water layer. The results of this work provide new ideas for the grouting and water plugging in Luohe Formation sandstone.

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  • 收稿日期: 2023-04-08
  • 最后修改日期: 2023-06-16
  • 录用日期: 2023-07-06
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