A comprehensive analysis of bottomhole pressure and productivity measurements of the multilayer object in wells equipped with permanent downhole gauge systems

UDK: 622.
DOI: 10.24887/0028-2448-2018-6-76-80
Key words: well test, permanent downhole gage, reservoir pressure, pressure buildup curve, inflow performance relationship, multilayer object of development
Authors: A.F. Gimaev (BashNIPIneft LLC, RF, Ufa) , S.Z. Fatikhov (BashNIPIneft LLC, RF, Ufa), V.N. Fedorov (Ufa State Petroleum Technological University, RF, Ufa), A.G. Malov (Bashneft-Dobycha LLC, RF, Ufa)

In fields with a large number of oil-saturated layers it is not uncommon to combine several layers into a single object of development. In most cases, they are developed by a single filter, it is leads to the need for special methods to control energy, productive and filtration parameters of multilayer objects.

On the example of the use of permanent downhole gauge systems hardware and software complex SPRUT at the fields of the Republic of Bashkortostan the features of control of energy and filtration properties of multilayer objects by a single filter are considered. The method inflow performance relationship is used to estimate reservoir pressures and coefficients of productivity of each object. It is shown that to control the change in reservoir pressure build-up test method should be supplemented with information on the productivity index of each formation and the magnitude of the steady flow between the layers. In the absence of special studies, reservoir productivity indexes can be obtained only using inflow performance relationship. And reliable information about the flow is available only on the flow meter sensor, i.e. the conditions for the reliability of flow measurements for mechanical flow meters must be fulfilled.

It is shown that at different reservoir pressures, the cessation of production from the well will correspond to the well test by the method of pressure stabilization curve (productivity analysis). Therefore, to determine the filtration properties of layers in the interpretation of such well tests, the values of reservoir pressures and the flow between the layers are the input parameters. On the real example of such well test two approaches of data interpretation are demonstrated: the first one, in case of availability of reliable data on the amount of flow and formation pressures using the method of pressure stabilization curve; the second – in the absence of these data using modeling.

The article also specifies the limitations and conditions of permanent downhole gauge systems of multi-layer objects by a single filter, and offers recommendations for increasing the information content of such systems.


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