CAJ | 학술논문

　　稠油由于其非牛顿特性，在多孔介质中的渗流特征与常规原油不同，一般表现为非线性渗流，其特征之一是可能存在启动压力梯度，只有当驱替压力梯度超过启动压力梯度时稠油才开始流动，且渗流规律偏离达西定律。通过室内实验研究，设计了合理测量启动压力梯度的方法。利用天然岩心与实验室配制的模拟油，设定不同的驱替流量来测量启动压力梯度，研究实验测量启动压力梯度过程中驱替流量对测量结果的影响。结果表明，当驱替流量超过某一临界值时，测量得到的启动压力梯度会受到驱替流量的影响。因此，在测量岩心真实启动压力梯度的过程中，实验方法和驱替流量的选择不容忽视。
　　주유유우기비우돈특성，재다공개질중적삼류특정여상규원유불동，일반표현위비선성삼류，기특정지일시가능존재계동압력제도，지유당구체압력제도초과계동압력제도시주유재개시류동，차삼류규률편리체서정률。통과실내실험연구，설계료합리측량계동압력제도적방법。이용천연암심여실험실배제적모의유，설정불동적구체류량래측량계동압력제도，연구실험측량계동압력제도과정중구체류량대측량결과적영향。결과표명，당구체류량초과모일림계치시，측량득도적계동압력제도회수도구체류량적영향。인차，재측량암심진실계동압력제도적과정중，실험방법화구체류량적선택불용홀시。
Due to the non-Newtonian behavior of heavy oil, the seepage characteristics in porous medium are different from conventional crude oil. They usually seep in nonlinear ways and there might exist threshold pressure gradients. Only when the displacement pressure gradient is greater than the threshold pressure gradient, heavy oil begins to flow, and the seepage rule deviates from Darcy’s law. Through laboratory experiments, this paper designs a method for measuring threshold pressure gradient appropriately. Natural core samples and simulated oil are used to measure threshold pressure gradient by setting different flow rates. In this way, the impact of flow rate on threshold pressure gradient is studied. The results show that the threshold pressure gradient would be affected when the displacing rate exceeds a critical value. Therefore, in the process of measuring real threshold pressure gradient of a core, the choice of experimental method and displacing rate can not be ignored.