首页|Multi-well deconvolution issue solving for producing well with increasing water-cut through CRM-model application
Multi-well deconvolution issue solving for producing well with increasing water-cut through CRM-model application
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NSTL
To improve the effectiveness of mathematical modeling, analysis, control, regulation and optimization of oil field development, it is very important to have the appropriate information support. To this aspect well testing is a necessary data source. One of the most actual well test data analysis instrument is deconvolution (single-well and multi-well). The principle of superposition is implemented in the theory of well test interpretation using convolution, which makes it possible to take into account the influence of well production (or wells) history on the studied section of the bottom-hole pressure change curve. Reverse convolution or deconvolution makes it possible to derive an equivalent bottom-hole pressure curve under an unknown filtration model, which will be a reservoir 'response' to the well production at the constant rate, being equivalent to a changing well rate production. It makes it possible to 'eliminate' the changing well rate influence on bottom-hole pressure curve and identity interpretation flow model. The main disadvantage of single well deconvolution is the condition of well interference absence. To overcome this constraint a multi-well deconvolution is applied. Its main purpose is to assess the interference of wells and to determine the inter-well filtration-capacitive properties. In common case multi-well deconvolution task solution is a labour-intensive process. The main limitation of known approaches application to multi-well deconvolution is assumption of constant filtration model (also actual for single well deconvolution). It makes impossible its application to producing wells with increasing water-cut analysis. Instead, it is possible to go to an equivalent task and describe the wells interference using a modified CRM-model. Therefore, the article proposes a specially modified CRM-model, which can be used as an analogue to bottom-hole pressure and well rate data multi-well deconvolution for wells with increasing water-cut. The CRMsim-model is taken as the initial model for further modification. Unlike to the CRMsim-model, in the present case, the accounting of the water-cut is based on historical data by modifying the productivity index. In total 6 different modifications were proposed. This concept is tested on synthetic data and on field data from an oil field in the Timan-Pechora province. Testing on the synthetic example shows good results. In the case of the real field example, the results acquired after multi-well deconvolution application to well with increasing water-cut by 6 proposed models were compared to well test results of zero water-cut production period. Evaluated filtration-conductivity properties are of high reliability degree for zones adjacent to well and reservoir between wells, pressure interference of every well has been identified according to tested well production data. This approach is a reasonable alternative to the multi-well deconvolution, which is not applicable to changing flow model of well with increasing water-cut.
Well testMulti-well deconvolutionCRM-ModelBnddey-Leverett theoryPressure drawdown curveWell interference test
S.G. Volpin、I.V. Afanaskin、P.V. Kryganov
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Federal State Institution 'Scientific Research Institute for System Analysis of the Russian Academy of Sciences' (SRISA RAS), Moscow, Russia
NSTL
