CAJ | 학술논문

煤粉是煤层气水平井排采中的不利因素，影响煤层气的产能。根据沁水盆地南部樊庄区块煤层气水平井的排采数据，分析了煤粉产出特征；通过煤粉在支撑裂缝中运移的物模试验，揭示了煤粉在支撑裂缝中的运移和伤害规律；利用流体迁移规律研究装置，进一步研究了煤粉在水平井筒的流动规律，建立了煤粉运移模型。研究结果表明：煤粉主要来源为钻井过程中钻具对煤层的研磨及压裂过程中大排量携砂混合流体对裂缝煤壁的摩擦和冲刷；煤粉对支撑裂缝中导流能力伤害率达90%，且排采速度越大，出煤粉量越多；煤粉在水平井筒中运移的流型为层流流动，通过控制压力、流量和煤粉含量，可在排采初期实现对煤粉的控制。
매분시매층기수평정배채중적불리인소，영향매층기적산능。근거심수분지남부번장구괴매층기수평정적배채수거，분석료매분산출특정；통과매분재지탱렬봉중운이적물모시험，게시료매분재지탱렬봉중적운이화상해규률；이용류체천이규률연구장치，진일보연구료매분재수평정통적류동규률，건립료매분운이모형。연구결과표명：매분주요래원위찬정과정중찬구대매층적연마급압렬과정중대배량휴사혼합류체대렬봉매벽적마찰화충쇄；매분대지탱렬봉중도류능력상해솔체90%，차배채속도월대，출매분량월다；매분재수평정통중운이적류형위층류류동，통과공제압력、류량화매분함량，가재배채초기실현대매분적공제。
As a disadvantage factor of drainage gas recovery in CBM horizontal well, pulverized coal usually leads to reservoir damage, pump stuck and other accidents when it transports in the fracturing propped fracture and horizontal wellbore, increasing the cost. Therefore, the coal powder output characteristic was analyzed according to the production data of Fanzhuang block in southern Qinshui basin, the migration of pulverized coal in propped fractures and the damage rule were revealed through physical model experiments on the migration of pulverized coal in propped fractures. The flow rule of pulverized coal in horizontal wellbore was further studied and the pul-verized coal migration model was established with the use of the device for research of fluid migration law. The result indicates that the main sources of pulverized coal are the drill grinding of coal seam in the process of drilling and the friction and erosion of large displacement fluid mixed with sand in coal wall cracks in the process of frac-turing;the damage rate of propped fracture diverting capacity caused by pulverized coal could reaches 90%, what’s more, the higher the velocity of production, the more the amount of coal powder;the flow pattern of migration of pulverized coal in horizontal wellbore is the laminar flow regime, the pulverized coal could be well controlled at the beginning of production by controlling the pressure, flow and pulverized coal concentration.