CAJ | 학술논문

煤层气压裂返排过程中产出的煤粉影响煤层气解吸运移，易造成煤层渗透率的永久伤害，降低气井产气量。采用自主研发的压裂液裂缝返排实验装置，模拟一定煤粉粒径配比关系下，采用不同的排采制度和不同外加液体，研究裂缝中煤粉的运移规律，测定煤粉和支撑剂被携带出的临界流量和煤粉返排效率，揭示煤粉运移与流体流速、外加液体关系的变化规律。研究表明：清水不能润湿煤粉，煤粉悬浮剂能较好润湿煤粉；煤粉含量越大，流出率越低；煤粉流出量随时间变化满足幂函数递减规律；变排量排采可以增大煤粉的返排效率。
매층기압렬반배과정중산출적매분영향매층기해흡운이，역조성매층삼투솔적영구상해，강저기정산기량。채용자주연발적압렬액렬봉반배실험장치，모의일정매분립경배비관계하，채용불동적배채제도화불동외가액체，연구렬봉중매분적운이규률，측정매분화지탱제피휴대출적림계류량화매분반배효솔，게시매분운이여류체류속、외가액체관계적변화규률。연구표명：청수불능윤습매분，매분현부제능교호윤습매분；매분함량월대，류출솔월저；매분류출량수시간변화만족멱함수체감규률；변배량배채가이증대매분적반배효솔。
With the use of fracturing fluid flowback experiment apparatus developed independently, this paper is to study the coal powder migration regularities with different percentage of coal powder of various sizes and different drainage system, plus distinct fluids. We explored the critical flow rate for coal powder and proppant migration, as well as the coal powder flowback efficiency. We aimed at establishing the relationship among coal powder migra-tion and fluid velocity and various fluids. Experiments show that water doesn’t wet the coal powder, but coal pow-der suspending agent does. The more the coal powder is, the lower the discharge rate. The change of outflow vol-ume of coal powder versus time meets the law of power function decreasing. Drainage with variable discharge rates can promote the flowback efficiency of coal powder.