Analysis on inflowing of the injecting Water in faulted formation

Abstract

As to low permeability reservoir, faults and fractures have a significant impact on effect of water injection and may lead up to the lower efficiency of oil displacement, which will bring about low efficiency of injecting water, and the intended purpose of improving recovery factor by water injection will not be reached. In order to reveal the mechanism for channeling of injecting water, research work is conducted as follows: First of all, based on seepage mechanics, fluid mechanics, rock mass mechanics, and multifield coupling theory, the mathematical model considering fluid-solid coupling of waterflooding development for low permeability reservoir is established, the numerical solution of the coupling model is obtained, and by creating an interface program between the seepage simulation procedure and stress computation program, we set up a feasible method to simulate the process of development of reservoir considering deformation of reservoir stratum; second, some cores are selected to test the stress sensitivity of rock in reservoir, and the relation of permeability and stress is proposed to connect the field parameters of the coupling model; finally, taking the S11 block of Daqing Oilfield, for instance, the seepage field and deformation of reservoir stratum is analyzed, and then the mechanism for leakage of injecting water in this block is given out, and the advice for adjustment of injection-production scheme in the future development stage is provided.

An Investigation into the Effects of Weak Interfaces on Fracture Height Containment in Hydraulic Fracturing

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The experimental and numerical analysis of elastic rock mechanical properties in tight conglomerate rock samples: a case study in Junggar Basin

“…Tight conglomerate rocks are often characterized with heterogeneity and low permeability and porosity. They have attracted increasing attention as a significant source of hydrocarbon production in unconventional reservoirs (Zou et al, 2012;Ji et al, 2015). The exploitation of these complex reservoirs requires advanced experimental and simulation techniques to optimize engineering strategies and relevant parameters (Li, 2022).…”

Research on the influence of stress on the penetration behavior of hydraulic fracture: Perspective from failure type of beddings

“…The influence factors can be divided into three types, the stress difference (Warpinski et al, 1982;Huang et al, 2016;Weng et al, 2018), the difference of rock properties (Huang et al, 2018;Xu et al, 2019;Huang et al, 2023), and the weak bedding planes (Tang and Wu, 2018;Xing et al, 2018;Zhang et al, 2022). Some numerical simulation and physical experiments about the penetration behavior of hydraulic fractures showed that the filtration of fracturing fluid into the bedding plane reduces the penetration ability (Ji et al, 2015;Huang et al, 2019;Gao and Ahmad, 2020;Luo et al, 2022). It mainly describes the phenomenon that the bedding planes hindered fracture propagation, but fails to explain the control mechanism of bedding on hydraulic fracture.…”