CAJ | 학술논문

在页岩气藏的压裂开发中，支撑裂缝的渗透率是影响裂缝导流能力和压裂增产效果的重要因素。通过实验手段，研究了吸附气体的溶胀作用和支撑剂的嵌入作用对Greenriver页岩支撑裂缝渗透率的影响。采用Pulse test实验方法，测量并对比了非吸附气体和吸附气体的渗透率。以He为代表性的非吸附性气体，实验测得其在花岗岩和页岩中的渗透率曲线为线性，渗透率随着有效应力的减小而增加，且支撑剂的嵌入作用使页岩中的渗透率明显降低；以CO2为代表性的吸附性气体，实验测得其在页岩中的渗透率曲线呈典型的“U”型，这是由于CO2溶胀作用和有效应力共同作用的结果，从而说明在页岩支撑裂缝中，溶胀作用同样对渗透率有显著影响；与He在页岩中的渗透率相比，相同压力下的CO2渗透率更低，且在Langmuir压力值附近达到最小值。
재혈암기장적압렬개발중，지탱렬봉적삼투솔시영향렬봉도류능력화압렬증산효과적중요인소。통과실험수단，연구료흡부기체적용창작용화지탱제적감입작용대Greenriver혈암지탱렬봉삼투솔적영향。채용Pulse test실험방법，측량병대비료비흡부기체화흡부기체적삼투솔。이He위대표성적비흡부성기체，실험측득기재화강암화혈암중적삼투솔곡선위선성，삼투솔수착유효응력적감소이증가，차지탱제적감입작용사혈암중적삼투솔명현강저；이CO2위대표성적흡부성기체，실험측득기재혈암중적삼투솔곡선정전형적“U”형，저시유우CO2용창작용화유효응력공동작용적결과，종이설명재혈암지탱렬봉중，용창작용동양대삼투솔유현저영향；여He재혈암중적삼투솔상비，상동압력하적CO2삼투솔경저，차재Langmuir압력치부근체도최소치。
In the process of shale gas fracturing exploitation,the permeability of propped shale fracture is one of the key factors that affect the fracture conductivity. This work focuses on the effects of swelling and embedment on permeability in propped shale using experimental method. The Pulse test method was used to measure the permeability of adsorbed gas and non-adsorbed gas. The permeability of He,which is a non-adsorbing gas,in both granite and shale was measured for references. The reduction of permeability in shale is caused by the existence of proppant embedment. The“U shape”feature is observed in CO2 permeability curve,which indicates that the swelling also has a significant effect on the permeability in shale. Compared with the permeability curve of He,the CO2 permeability is even lower and achieves the minimum value at the pressure condition around the Langmuir pressure.