Совершенствование метода внутрискважинной перекачки пластовых вод

Abstract

Extensive development of methods of reservoir pressure maintenance (RPM) by discharge of water in the development of oil deposits has forced to pay attention to such external source of oil field water supply as aquifers containing mineralized water. Groundwater injection into oil reservoirs provides not only RPM, but also leads to enhanced oil recovery. It should be noted that a low concentration of carbonic acid in solution gas in groundwater and the lack of oxygen and sulfide are beneficial. On the other hand, the use of the closed system of water collection and pumping into oil-bearing strata promotes the reduction of the aggressiveness of the waters. Also, mineralized formation water having the temperature of the reservoir, will not cause increase in the viscosity of oil and the wax separation. Therefore, the units for downhole pumping of formation water from an aquifer into productive stratum have recommended themselves as a very effective means of maintaining reservoir pressure at small remote oil fields. The main advantage of these units is arrangements for RPM on remote and, especially, small sites that do not require the construction of special complex systems. Aims and Objectives The study of the flooding technique using the formation water downhole pumping. Evaluation of the efficiency of the technique. Analysis of the benefits and risks of this technique. Study of criteria for selection of wells for downhole pumping. Methods The solution of set tasks was performed in an analytical way with the use of conventional methods of geological field analysis of oil field development, and generalization of scientific literature data on the problem under study. Results Introduction of the improved arrangement of downhole pumping in the well No. 40118 of deposit No. 33 in Romashinskoye field gave 2568 tons of oil additionally recovered from the responding wells. Conclusion • Units for down hole pumping of formation water are rather effective means for reservoir pressure maintenance in remote fields. • Main advantage of these units is RPM feasibility without big material investments into a complex system. • The use of highly mineralized formation water in the downhole pumping system provides enhanced oil recovery through involvement into development of clay containing reservoirs. • The use of highly mineralized formation water contributes to the protection of the environment, mostly by reducing use of fresh water resources. • Yet there are risks, such as removal of solid suspended particles, failure of the telemetry down-system, the deposition of salts. As a whole, tested downhole pumping units have shown their effectiveness, and the potential of application of the downhole pumping technique has not been exhausted. On 01.02.2015 the cumulative additional oil production from all five wells amounted to around 10 thousand tons. Modern downhole pumping arrangement improves the informative content and intellectualization of monitoring of field development.