TO THE QUESTION OF ACCURACY OF EVALUATION OF THE PRODUCTIVITY FACTOR OF LOW-PRODUCTION WELLS

Abstract

In the practice of any exploration or oil producing enterprise, the parameters of a productive or potentially promising geological target are estimated using a method of temporary tracking and recording of a change in level/pressure based on the classical principle of sequential change of stationary states. Its main drawback against the background of wide practical application is the incorrect determination of the reliable value of the productivity coefficient (Kprod) for complex reservoir rocks, especially those with strong texture heterogeneity, which in reality is not enough to draw up high-quality and most importantly real design technological documents for the integrated development of oil and gas fields. Hence the large degree of conventionality of the results obtained during office processing, as well as various opinions among specialists on the problems of interpretation of hydrodynamic studies of wells. The special literature on oilfield geology and hydrodynamic studies contains numerous attempts by different researchers from various sides to overcome this (significant in the opinion of the authors of the article) drawback of using the above method, but so far there have been no noticeable positive "shifts" in this direction. Everything rests on the bulkiness and complexity of the proposed analytical solutions.
 Based on many years of research, the authors of the article give their vision of solving this problem. The proposed modified grapho-analytical method of calculation in low-flow non-permeation wells that penetrated reservoir rocks with oils with Newtonian properties makes it possible to estimate the reliable value of the productivity factor of the reservoirs (Kprod) in the conditions of the formation pressure deficit that exists everywhere in the fields of the West Siberian oil and gas basin (with stationary flat-radial filtration).