«Oilfield engineering»

Some aspects of the problem of production allocation among reservoirs of multi zone gas fields being developed by wells unified network

UDC: 622.279.23/.4
DOI: -

Authors:

¹ Gazprom VNIIGAZ, St. Petersburg, Russia

Keywords: reservoir, flow rate, pressure, multilayer objects, product distribution, flow resistance coefficients, geological-hydrodynamic model, hydrodynamic studies, macro-roughness coefficient

Annotation:

The results of various approaches analysis to allocation of natural hydrocarbons extraction from multi-layer natural gas deposits being operated by a unified system of wells are presented. In addition to fluid influx direct measurement in reservoir intervals by applying field-geophysical studying methods, calculations, made on the basis of gas-dynamic models of fields are used as the most correct instrument for hydrocarbons production allocation between jointly developed reservoirs. The data of hydrodynamic studies and the development history are used for hydrodynamic model building. The significant problem for wells hydrodynamic testing data interpretation in case of multilayer gas fields and production allocation based on gas-dynamic modeling is the nonlinear flow law manifestation in the bottom hole zones of wells.

The authors of the article propose a method for determining flow resistance coefficients A and B for each of the layers of a multi-layer object developed by joint wells which is based on the data of indicator diagrams data interpretation. The obtained values of flow resistance coefficients are used for production allocation among reservoirs of multilayer natural gas fields based on calculations made by dynamic modeling.

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