The purpose of the present research effort is to develop a method for determination of partial (zonal) production rates in wells penetrating several pay intervals. It is common knowledge that physical and chemical properties and oil composition vary through reservoir thickness, along the strike and in the course of production operations. This relates to such parameters as density, viscosity, fractional composition, bubble-point pressure, gas-oil ratio, content of asphaltenes, resins, sulfur etc. However, laboratory determination of these parameters, for the most part, is challenging and time-consuming. Application of a set of parameters for production monitoring relies on regular sampling and analysis of the produced oil. Besides, the method provides for creation of a database, containing the data on oil properties for each production zone associated with a particular field.
A new method for determination of partial production rates of multizone wells has evolved in TatNIPIneft. This method uses spectrophotometric analysis and has already been implemented to identify the oil recovered from 28 dually completed wells of Ersubaikinskoye, Shegurchinskoye, and Yamashinskoye fields. A satisfactory match has been found between spectrophotometry data on production rates of individual production zones and the results obtained during plunger readjustment of a single-tubing-string dual completion system, as well as available production history information.
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