The generation and transport of coal powder has caused great harm to coal reservoir channeling conductivity, affecting the capacity of coalbed methane wells, causing the failure of engineering equipment and great distress to production, while current unblocking methods have many shortcomings. Dispersants, foam stabilizers, and inorganic salt electrolytes were selected in this study as the main components of blockage removal agents, and the wettability and synergistic effects of each component were tested. The results showed that the wettability was best when the ratio of the blockage removal agent was 0.8% SDS + 0.6% BS-12 + 0.8% NaCl, which was 1.57 times higher than that of a single dispersant. The surface tension of blockage removal agent was 64.75% lower than that of clear water. The discharge rate of the pulverized coal particles under the action of the optimum blockage removal agent reached more than 40%, which was more than twice that of clear water. The discharge of the pulverized coal was more than 1.2 times that of the common dispersant formula. The gas-liquid permeability was 4.21 times higher than that obtained with water injections, and 1.45 to 2.91 times higher than that of the commonly used dispersant formulations. This work is helpful to provide a practical guide for the efficient cleaning of sedimentary retained pulverized coal in low-yield coalbed methane wells. This research result is very important to ensure the efficient and stable development of coalbed methane.

中文翻译：

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煤层气藏解堵剂处理提高含煤支撑裂缝渗透率

煤粉的产生和输送对煤储层窜导能力造成很大危害，影响煤层气井产能，造成工程设备故障，给生产带来极大困扰，而现有的解堵方法存在诸多不足。本研究选取分散剂、稳泡剂、无机盐电解质作为解堵剂的主要成分，并测试各成分的润湿性和协同效应。结果表明，当清堵剂配比为0.8%SDS+0.6%BS-12+0.8%NaCl时润湿性最好，比单一分散剂润湿性提高1.57倍。除堵剂的表面张力比清水低64.75%。煤粉颗粒在最佳解堵剂作用下的排出率达到40%以上，是清水的2倍以上。煤粉排放量是普通分散剂配方的1.2倍以上。气液渗透率比注水提高4.21倍，比常用分散剂配方提高1.45～2.91倍。该工作有助于为低产煤层气井沉积滞留煤粉的高效清理提供实用指导。该研究成果对于保障煤层气高效稳定开发具有重要意义。