ISSN: 2578-4846
Authors: Deryaev A*
In the context of developing multilayer deposits in Turkmenistan, the technical and economic evaluation of technique used in simultaneous and independent operation represents an important area of work. Most of the oil and gas fields both in our country and abroad are multi-layered. At the same time, several productive layers are located layer by layer one above the other. From the point of view of rational development, the development of such deposits by independent grids of wells drilled for each individual reservoir is the most preferable. However, the experience of oilfield development shows that more than half of all capital investments are spent on drilling wells. Therefore, the development of multilayer deposits by independent well grids for each formation requires huge capital expenditures and is not always economically and technologically justified. In this regard, when developing multi-layer deposits, several productive formations are often combined into one operational facility, which makes it possible to shorten the time of field development, reduce capital investments for drilling wells and field development, etc. At the same time, simultaneous development of several formations by one object is possible only with the same physico-chemical properties of oils in the combined formations, if the inflow of oil and gas is sufficient from each formation at an acceptable bottom-hole pressure in the well, with close values of reservoir pressure in the combined formations, excluding oil flows between the formations, and close values of reservoir waterlogging. If the above conditions are not met, then multidimensional deposits are developed using the method of simultaneous and independent operation (hereinafter referred to as SIO) with one well. Depending on the specific geological and technical conditions for the development of deposits, technical and operational characteristics of wells, one of the currently available SIO schemes is used. Mandatory requirements for all SIO schemes are the possibility of separate development and commissioning of each reservoir, measurement of oil flow rates of each reservoir separately, as well as separate measurement of each reservoir for waterlogging, gas content and examination of each reservoir for oil and gas inflow. When deciding on the use of the SIO method, the degree of depletion of reserves, the proximity of the oil content contour to wells, the presence of resins and paraffin in the extracted oils, the thickness of the productive layers and the impermeable interlayers separating them, the condition of the production column of wells, etc. Productive horizons have different capacities from one to several tens of meters; their operation is carried out from the bottom up according to the traditional scheme. Such a traditional scheme of operation of multilayer deposits provides for the development of a grid of vertical wells for each operational facility, which leads to an increase in capital costs for drilling wells and a decrease in the profitability of the products obtained. Accordingly, in the production of hydrocarbons, the main cost item is the construction of new production wells. It is necessary to solve the problem of reducing construction costs almost immediately with the introduction of wells into drilling. The simplest way is to combine several oil-saturated horizons into several development facilities. Simultaneous and independent operation (SIO) and dual water injection operation (DIO) can be applied to regulate the zone development by layers (uniform exploration of layers, intensification of one of the layers). In these cases, the application of SIO and DIO methods aims to increase the current oil production. Savings in this case are generated by increasing the fluid oil production, both from intensifying development and preventing premature well flooding. The goal and objective of this scientific review are the technical and economic evaluation of the application of simultaneous and independent operation means and incorporation of productive horizons to increase hydrocarbon production during the development of deposits in the initial and late stages of operation. The economic efficiency of such regulation of production is determined by comparing the technical and economic indicators of the zone's development without regulation, calculated considering the actual ratio of technological and economic indicators with the actual technical and economic indicators. Incorporating productive horizons can play a significant role in increasing current oil production, and in some cases, enhancing the oil recovery of the incorporated zone, through the most effective utilization of previously drilled wells on the field. One of the key current technological indicators of incorporation is the additional well production rate, i.e. the increase in current production achieved through the implemented measures. The practical significance of this work lies in the technical and economic evaluation of a more efficient and sustainable oil and gas production technology developed in Turkmenistan, leading to increased production and reduced capital investments at the early and late stages of field development.
Keywords: Oil Recovery; Economic Efficiency; Productive Formation; Injection; Extraction; Reserves Recovery; Incorporation
