Stiff- and Compliant-porosity Based Model of Permeability - Theory and Experiments

Shapiro, Serge A.; Хижняк, Г П; Plotnikov, Vladimir; Niemann, R.; Ilyushin, P. Yu.; Galkin, Sergey

doi:10.3997/2214-4609.201412949

Proceedings

2015

DOI: 10.3997/2214-4609.201412949

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Stiff- and Compliant-porosity Based Model of Permeability - Theory and Experiments

Serge A. Shapiro¹,

Г П Хижняк²,

Vladimir Plotnikov³

et al.

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“…However, the process of PGTM construction for structurally complex reservoirs is marked by uncertainties, associated with underestimation of the following geological features: secondary processes (karsting, dolomitization, fracture formation), influence of changes in the effective pressure on the voids of reservoir rocks, abnormally high reservoir pressure and stress values in the tectonic fault zones. Studies [15,16] present results of core tests, demonstrating a different character of porosity and permeability variations, when stress state of the rocks results from stress load.…”

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Accounting of geomechanical layer properties in multi-layer oil field development

Galkin

Krivoshchekov

Kozyrev

et al. 2020

PMI

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Amid the ever-increasing urgency to develop oil fields with complex mining and geological conditions and low-efficiency reservoirs, in the process of structurally complex reservoir exploitation a number of problems arise, which are associated with the impact of layer fractures on filtration processes, significant heterogeneity of the structure, variability of stress-strain states of the rock mass, etc. Hence an important task in production engineering of such fields is a comprehensive accounting of their complex geology. In order to solve such problems, the authors suggest a methodological approach, which provides for a more reliable forecast of changes in reservoir pressure when constructing a geological and hydrodynamic model of a multi-layer field. Another relevant issue in the forecasting of performance parameters is accounting of rock compressibility and its impact on absolute permeability, which is the main factor defining the law of fluid filtration in the productive layer. The paper contains analysis of complex geology of a multi-layer formation at the Alpha field, results of compression test for 178 standard core samples, obtained dependencies between compressibility factor and porosity of each layer. By means of multiple regression, dependencies between permeability and a range of parameters (porosity, density, calcite and dolomite content, compressibility) were obtained, which allowed to take into account the impact of secondary processes on the formation of absolute permeability. At the final stage, efficiency of the proposed methodological approach for construction of a geological and hydrodynamic model of an oil field was assessed. An enhancement in the quality of well-by-well adaptation of main performance parameters, as well as an improvement in predictive ability of the adjusted model, was identified.

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confidence: 99%

Accounting of geomechanical layer properties in multi-layer oil field development

Galkin

Krivoshchekov

Kozyrev

et al. 2020

PMI

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Experimental evaluation of compressibility coefficients for fractures and intergranular pores of an oil and gas reservoir

Wang

Кузьмин

2021

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The paper is devoted to studies of the volumetric response of rocks caused by changes in their stress state. Changes in the volume of fracture and intergranular components of the pore space based on measurements of the volume of pore fluid extruded from a rock sample with an increase in its all-round compression have been experimentally obtained and analyzed. Determination of the fracture and intergranular porosity components is based on the authors' earlier proposed method of their calculation using the values of longitudinal wave velocity and total porosity. The results of experimental and analytical studies of changes in porosity and its two components (intergranular and fractured) under the action of effective stresses are considered. This approach allowed the authors to estimate the magnitude of the range of changes in the volumetric compressibility of both intergranular pores and fractures in a representative collection of 37 samples of the Vendian-age sand reservoir of the Chayanda field. The method of separate estimation of the compressibility coefficients of fractures and intergranular pores is proposed, their values and dependence on the effective pressure are experimentally obtained. It is determined that the knowledge of the values of fracture and intergranular porosity volumetric compressibility will increase the reliability of estimates of changes in petrophysical parameters of oil and gas reservoirs caused by changes in the stress state during the development of hydrocarbon fields.

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Stiff- and Compliant-porosity Based Model of Permeability - Theory and Experiments

Cited by 2 publications

References 0 publications

Accounting of geomechanical layer properties in multi-layer oil field development

Accounting of geomechanical layer properties in multi-layer oil field development

Experimental evaluation of compressibility coefficients for fractures and intergranular pores of an oil and gas reservoir

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