Evaluation on Injection-Production Connectivity of Low-Permeability Reservoirs Based on Tracer Monitoring and Numerical Simulation

doi:10.7657/XJPG20210613

Abstract

Abstract:

As a typical oilfield developing low-permeability reservoirs in China, Changqing oilfield has huge resources of tight oil and gas. However, strong reservoir heterogeneity, poor injection-production connectivity and low oil recovery make it urgent to describe the reservoir development units in details to improve the development effects of well groups at medium-high water cut stage. Taking well group Q011-35 as a case, this study evaluated the waterflooding development effect of the well group based on the contact types of the target Chang 6₁ sand bodies and the results of tracer monitoring and reservoir numerical simulation. It is concluded that the well group Q011-35 is strongly heterogeneous. Laterally, there are high-permeability zones in the northwest and southwest, while vertically, Chang $6^2_1$ is flooded more completely than Chang $6^1_1$, and the remaining oil in Chang $6^1_1$ is richer, indicating reservoir connectivity and injection-production relationship are controlling factors on the distribution of remaining oil. The combination of tracer monitoring and reservoir numerical simulation eliminates the limitations caused by a single method in evaluating interwell connectivity, therefore the results are more accurate and reasonable. The conclusion is a reference to fine evaluation on waterflooding development effect of low-permeability reservoirs and taking effective measures for potential tapping of remaining oil.

Key words: Changqing oilfield, low-permeability reservoir, tracer monitoring, numerical simulation, heterogeneity, sand body contact type, communication channel, waterflooding effect

CLC Number:

TE348

LI Ning, YANG Lin, ZHENG Xiaomin, ZHANG Jinhai, LIU Yichen, MA Jiong. Evaluation on Injection-Production Connectivity of Low-Permeability Reservoirs Based on Tracer Monitoring and Numerical Simulation[J]. Xinjiang Petroleum Geology, 2021, 42(6): 735-740.

Figures/Tables 7

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