Determination of the parameters of the zone of disturbance of the filtration properties of the formation according to thermohydrodynamic studies
Abstract
Relevance. Evaluation of near-wellbore zone (NWZ) parameters, such as radius and permeability of the filtration property disturbance zone, is a key task for planning and monitoring the efficiency of geological and technical measures. Existing diagnostic methods have limitations, especially under widely used conditions of two-phase (oil-water) filtration. Classical approaches developed for a single-phase medium require adaptation and validation for more complex multiphase systems. Aim. Development and testing of a simple and physically sound technique for sequential determination of the radius and permeability of the disturbance zone in the NWZ based on non-stationary thermometry data during two-phase oil and water filtration. Object and methods. The object of the study is the process of non-isothermal two-phase filtration in a formation with radial heterogeneity. The methodological basis of the work is a new analytical solution for a non-stationary temperature field that takes into account thermodynamic effects. The interpretation technique is based on the bilinear approximation of the diagnostic temperature graph in semi-logarithmic coordinates and finding the intersection point of the linear trends corresponding to filtration in the disturbed and undisturbed formation zones. The technique was tested by comparing its results with the data of numerical modeling in Ansys. Results. A step-by-step technique has been developed that allows sequentially determining the permeability and radius of the disturbed zone in the NWZ. It is shown that the time of arrival of the thermal signal from the zone boundary is determined by the intersection point of the approximating lines, which allows calculating the radius of the disturbed zone. The permeabilities of the zones are determined by the tangents of the angles of inclination of these lines. A numerical experiment confirmed the high accuracy of the technique: the error in determining the radius of the disturbed zone was 1.4 %, and the permeabilities were less than 8 %. It was found that a small error is due to physical effects (thermal conductivity, compressibility) not taken into account in the analytical model. Conclusions. The developed technique is an effective tool for express diagnostics of the state of the NWZ, applicable in practical conditions of two-phase flow.
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