Purpose. Improving the producing capacity and ensuring the stable operation of gas wells that develop unstable, low-cemented reservoirs by preventing the sand entry from the reservoir by means of creating the cement stone with the corresponding values of strength and permeability in the bottomhole formation zone. Methods. The technological characteristics of the cementing slurry and the formed cement stone are measured using standard recording equipment. The cementing slurry consistency is measured with a pycnometer, the cement mixture spread ability – using AzNII cone, water separation is measured according to standard methods (DSTU BV.2.7 – 86-99), and the time of the cementing slurry hardening is determined on a consistometer KTS-3. The ultimate parameters of the stone strength during bending are determined on a special device for testing linear objects in tension, and compression – on a PSU-10 hydraulic press. Findings. The cementing slurry composition for creating the cement stone with the corresponding values of compression strength and gas permeability in the bottomhole formation zone has been developed, which includes oilwell cement, expanded perlite, non-ionic surfactant, plasticizer and water. Dependences of the cement stone compression strength and the stone permeability coefficient on the proportion of expanded perlite in the cementing slurry solution have been revealed. It is recommended to use the proposed cementing slurry for creating a cement stone with specified values of compression strength and permeability in the expanded well shaft in the interval of the producing reservoir. Originality. The optimal proportion of the expanded perlite in the solution has been found, at which the corresponding values of the compression strength (up to 4 MPa) and gas permeability (up to 3.47 μm2) of the cement stone is provided. Practical implications. When using the developed composition, it is possible to increase the yield of wells with unstable reservoirs and improve their working conditions by preventing the sand entry from the reservoir into the well.
Introductions. Most of the natural gas fields in Ukraine, from which the main gas production is provided, are at the final stage of development, a feature of which is selective watering of productive reservoirs and production wells in conditions of low reservoir pressures. Based on the results of numerous studies, a number of techniques and inventions have been developed concerning the operation of water-cut gas and gas condensate wells, which are widely used in gas industry practice [1-3]. A promising direction for the development of natural gas fields in a water drive is the introduction of technologies based on the artificial-lift water-cut gas wells operation. When operating gas wells with a high content of formation water, the most effective is the use of electric center pumps (ECP). The use of external energy to remove formation fluid can significantly extend the life of gas wells in conditions of active inflow of formation water into productive reservoirs. [4-5]. The technology of controlled extraction of formation fluid based on ECP is currently the most promising methodology for minimizing the negative impact of the water drive on the natural gas production process. The results of national and foreign experience in the development of gas fields in the conditions of active advancement of formation water into gas-saturated horizons make it possible to substantiate the directions of further research to improve existing technologies for hydrocarbon production. Aim. Investigate the efficiency of using electric center pumps in order to optimize the operating conditions for water-cut wells. Results and discussion. Using the Schlumberger PipeSim software package, a study was made of the effect of wellhead pressure and different operating frequencies of electric center pumps on the productivity of water-cut wells.
Introduction. Gas and gas condensate reservoirs are often connected to waterpressure systems and are developed under water-drive [1]. The difficulty of extracting residual gas reserves in conditions of the inflow of formation water into productive deposits is associated with the watering of gas-saturated formations and wells.A significant number of experimental and theoretical studies are devoted to the design of a rational system for the development of water-driven hydrocarbon reservoirs [2][3].Based on the results of the studies, the mechanism of behavior of gas trapped by formation water in a porous medium was revealed. It was also found that the nature of the distribution of the reservoir properties of the reservoir introduces significant uncertainty in the process of substantiating the optimal technology for further field development under an active water-drive. It is the heterogeneity of productive formations, both in area and in thickness, which plays a decisive role in the selection and implementation of the developed technologies for enhancing recovery.Objective. Investigation of the influence of productive reservoir heterogeneity on formation water inflow during injection of carbon dioxide at the initial gas-water contact using a different number of injection wells.Results and discussion. Nowadays the direction of EOR in gas and gas condensate fields by injecting non-hydrocarbon gases (nitrogen, carbon dioxide, flue and waste gases, mixtures of various gases) remains promising [4][5].One of the most successful technologies for increasing the production of residual gas and reducing the activity of the water system is the injection of CO2 into the reservoir. According to the studies carried out, it was found that due to the
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