稠油蒸汽吞吐后期关停井恢复再生产地质因素正交分析方法

稠油油藏由于原油黏度大、流动性差，多周期吞吐后，近井地带含油饱和度下降幅度大、产量低、连续吞吐效益比较差。但是关停一个时期后，油藏内部再次达到动态平衡，剩余油会在这类井附近再次富集，开井生产仍能获得一定的产量和经济效益。河南稠油油田开展了这方面的矿场试验，并取得了比较好的效果。矿场试〖JP2〗验过程中，采用正交试验法，通过数值模拟技术分析了不同地质条件下的剩余油富集程度，利用极差分析法得到了影响蒸汽吞吐关停井剩余油再富集的地质因素排序为原油黏度、渗透率、纯总厚度比、孔隙度、油层厚度、油藏埋深、油藏倾角，并利用方差分析法进一步验证了该结果。依据这一研究成果确定了15口目标井恢复再生产，成功率800%。这一研究思路和方法可为东部老油田提高资源利用率提供参考和借鉴。

REPRODUCTION OF POST STEAM STIMULATION OF HEAVY OIL:APPLICATION OF ORTHOGONAL ANALYSIS OF GEOLOGICAL FACTORS

Heavy oil reservoir, very viscous, is difficult to be pumped after producing due to a descending oil saturation and low yield around the well; however, its production can be restored after stopping production for a period when a dynamic balance makes the remaining oil migrate to the well. A production test was made in Henan oil field with an excellent result. This paper applies orthogonal test and modelling to analyze the concentrating remaining oil in different geological conditions. Through extreme difference, geological factors related to heavy oil concentration ranks in order, crude oil viscosity, permeability, thickness ratio, porosity, oil bearing bed thickness, reservoir depth, reservoir dip, which is also verified by variance analysis. This method helped restoration of 15 wells at a 80% of success in Henan oil field, which provides references for reproduction of the old wells in the east.