The use of chromate-desorption systems to determine the intervals of water and gas breakthrough in the development of oil rims on the example of continuous monitoring of the wells of the Yareyuskoye field

Background. This paper presents a new technology for determining the inflow profile in the development of oil rims using chromate desorption systems.

Aim. quantification of fluid inflow in each well interval, diagnostics of water and gas breakthrough intervals.

Materials and methods. Chromate-desorption systems (CDS) are a polymer composite material into which unique chemical substances — analytes are packed at the manufacturing stage. CDS are installed on the elements of the lower completion of the investigated well. Upon contact with the target fluid, corresponding analytes begin to be released from the CDS, which are brought to the surface with a flow of liquid and/or gas to the sampling point. At the wellhead, sampling is carried out according to a pre-planned program, the analysis of the composition of the inflow is performed in the laboratory using chromatography methods. The technology makes it possible to determine the changing inflow profile and the dynamics of the well as a whole without conducting well logging.

Results and conclusion. During two years of research, 194 fluid samples were taken to determine the fluid inflow in each interval of the PT1 well. At the same time, 23 gas samples were taken to diagnose gas breakthrough intervals. Based on the analysis of gas samples, it was determined that gas comes from all five intervals. A quantitative assessment of the gas inflow was made, taking into account adjustments for the rate of release of analytes in each interval. A quantitative assessment of the oil inflow for each interval was made. Comparison of oil inflow profiles obtained using tracer and geophysical surveys showed comparable results.

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