Analysis of vertical permeability estimates based on interpretation of the build-up of pressure in horizontal wells
https://doi.org/10.51890/2587-7399-2024-9-3-34-42
Abstract
Introduction. Vertical permeability is an important characteristic of an oil-bearing reservoir, the knowledge of which allows solving many problems of scientific in oilfield practice. This parameter significantly affects the distribution of fluid flows in the formation, and therefore, understanding the specifics of its changes during the development of a production object is highly relevant. One of the most accessible sources of information on vertical permeability can be hydrodynamic well testing methods under unsteady filtration conditions.
Objective. To evaluate the peculiarities of changes in vertical permeability of the formation during the life cycle of horizontal wells under specific geological conditions of a particular oil fi eld by analyzing pressure restoration curves.
Materials and methods. The materials of geophysical, production hydrodynamic research conducted under steady-state and unsteady filtration conditions, as well as the results of their interpretation, were used. Data processing methods using mathematical statistics and graphical analysis applied.
Results. Shown that within a certain range of wellbore depressurization during well operation before shutting them down for testing, vertical permeability linearly depends on pressure drop. The equation of the approximating straight line has different characteristics for different wells. The obtained data served as the basis for developing a method that allows for a prompt assessment of horizontal permeability under the condition of well operation under such regimes.
Conclusions. The conducted research provides that the movement of reservoir flid in the vertical direction within numerically established depression intervals is complicated by nonlinear effects and does not follow Darcy’s law. Nonlinear effects are absent at higher pressure differentials. In the horizontal plane, the flow of reservoir fluid is not anomalous, so, it corresponds to the law of linear filtration.
About the Authors
A. G. Kozubovsky
JSC «InTEK»
Russian Federation
Russian Federation
Aleksandr G. Kozubovsky - Head of research group
Tyumen
T. V. Kuzmina
Tyumen Branch of LLC «Lukoil-engineering»
Russian Federation
Russian Federation
Tat’yana V. Kuzmina - Chief specialist of Department of development of oil and gas fields
143a, Republic str., 625000, Tyumen
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Review
For citations:
Kozubovsky A.G., Kuzmina T.V. Analysis of vertical permeability estimates based on interpretation of the build-up of pressure in horizontal wells. PROneft. Professionally about Oil. 2024;9(3):34-42. (In Russ.) https://doi.org/10.51890/2587-7399-2024-9-3-34-42
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