Maintenance of reliability of petroleum reservoirs in the period of operation

The content and periodicity of the restoration of petroleum reservoirs (RVS) in the regulatory documents [6] are defined very roughly, and from the standpoint of economic efficiency, the relevant issues are not sufficiently studied. Such a situation that has developed in the practice of revisions of the technical state of the RVS during operation requires the development of new mathematical models and methods to ensure the operational reliability of the RVS, taking into account the accumulated statistical material on defects and damage of these structures. The article describes the technical state of the tank during operation in terms of random functions of corrosive wear, depending on time as a parameter. Probabilistic criteria (the necessary conditions) for partial and complete restoration of RVS are formulated. The task of rational ensuring the reliability of the RVS during the operation period, taking into account the restoration, is considered. With reference to the standard design of a 5,000 m3 tank, the effect of the required level of reliability on the recovery strategies of structural elements was investigated. The corresponding recovery plans are obtained. Purpose of the article is to develop a method to ensure effectively the operational reliability of petroleum reservoirs based on the periodic restoration of their structural elements. Conclusions. The proposed probabilistic criteria for the restoration of reservoir structures and the corresponding reliability model can be useful in justifying the recovery strategy of RVS during the operation period. The parameters of these models can be adjusted according to the results of statistical processing of data from technical diagnostics of similar objects. The obtained plans for the restoration of reservoir structures are in good agreement with the frequency of technical diagnostics recommended in regulation documents [6], which confirm the reliability of the results obtained. As a result, the considered models and algorithms can serve as a quite effective mathematical tool in the study of problems of reliability of RVS within the framework of the economic approach.