SYSTEM APPROACH TO WELL CONSTRUCTION DURING GAS METHODS IMPLEMENTATION UNDER CONDITIONS OF PRODUCTIVE DEPOSITS OF BASHKORTOSTAN

Background At present, at the Bashkortostan productive formations development, increased attention to the implementation of water and gas impact is associated with large-scale development of oil reserves confined to low-permeability reservoirs, in which, with traditional flooding, the value of the design final oil recovery coefficient usually does not exceed 0.3. Aims and Objectives To consider the features of a system approach to the technology of discovered rocks waterproof during their drilling and completion, as well as methods for its implementation in conditions of productive formations of the fields of Bashkortostan. Methods Numerical modeling of gas displacement of oil to determine oil displacement coefficient and displacing agent concentration. Results As a result of the implementation of the technology of a systematic approach to well construction in permeable rocks of the opened interval, a near-barrel insulating screen with a thickness of up to 30 mm is formed, which is stable under depressions up to 0.010-00.012 MPa/m and during repressions up to 0.018-0.025 MPa/m. It is shown that the technology allows to stabilize the thermodynamic conditions of well construction, which positively affects both the wiring and quality of well attachment, and the implementation of various methods of stimulating the formation. In particular, the high effect of the degree of tightness of the well support on the magnitude of the effect of the implementation of gas methods for increasing oil recovery is indicated. The results of experiments on oil displacement by gas under the conditions of single pore models are presented. The features of the process of oil displacement by hydrocarbon gas are determined. The optimum miscibility pressure of liquid and gaseous hydrocarbons under the conditions of a model of a hollow medium was established. Based on the results of the experiments, a water-gas treatment technology was proposed. A numerical simulation of the gas displacement of oil was carried out in order to determine the oil displacement coefficient and the concentration of the displacing agent. It was determined that as a result of the implementation of the proposed technology in the D1 formation of the Tuymazinskoye field, a decrease in water cut of produced products by 15-25 points and an increase in oil recovery ratio by more than 7 points are predicted.