Increase in efficiency of methods of bottomhole formation zone treatment in active wells by information technique

The paper review efficiency of geological and technological methods (GTM) of bottomhole formation zone (BHFZ) treatment that increase productivity of production wells. Today, according to directional documents, value of skin-effect (S) which is determined by calculations based on well-test is the main information to screen a GTM. The greater positive value of S-effect at the same production rates, the earlier it is planned to carry out a GTM on a well. Wells with negative value of S take the last place. The larger value, the less probability of GTM application. There is no relation between S value and parameters of a particular GTM technology. That is caused by physical nature of this dimensionless coefficient. According to directional documents, S gives a generalized virtual assessment of BHFZ state through the principles of good-bad and more-less. Thus, BHFZ characteristics needed to select parameters for a particular technology of GTM application in each well remain unknown. An analysis of real physical objects that constitute structural basis of BHFZ whose properties determine value of S is performed. A historical review of development of this parameter since 1949 is given. It is established that generalized unified characteristic of BHFZ basically reflects its two properties, that are diriment in structural feature that are specific surface of a well drainage system and hydrodynamic resistance of its formation fluid. A technique for determination numerical values of these parameters is proposed. There are examples of application of proposed BHFZ characteristics for analysis of reasons of change in productivity of a production well of Perm region during 4 years of operation and reasons for change in productivity of five more wells after the GTM application are given in conclusion.