Ways of Consistently Optimizing Oil and Gas Production for the Gurgan-Deniz Field

The goal of the work is to generalize the results of optimization of the development system of Productive Series deposits (Lower Pliocene) by regulating the development using appropriate methods and Enhanced Oil Recovery (EOR). To achieve the goal, the following tasks were set: clarification of the geological structure of the field, clarification of geological profiles, assessment of oil-saturated reservoirs, analysis of the implemented development systems on terrigenous reservoirs, justification of a set of geological and technical measures, comparison of various development scenarios, assessment of the effectiveness of measures and the approach to optimization of development systems. The solution of these problems is the basis for increasing the degree of involvement of reserves in development using the analogy method. The target object is the Gurgan-Deniz oil field. The geological structure of the Gurgan-Deniz field is complex because it is complicated by longitudinal and transverse (thrust) faults. The fault divides the Gurgan-Deniz field into two areas, the northern and southern. The southwestern limb of the Gurgan-Deniz fold, with a longitudinal fault with a vertical displacement amplitude of 750-800 m, overlaps the northeastern limb and divides the field into supra-thrust and sub-thrust objects. The supra-thrust object includes – Gala (GaS) and Pre-Kirmaki (PK) suites; while the sub-thrust objects are: upper-lower and middle parts of the Pre-Kirmaki (PKu , PKb+ PK m) and Kirmaki (KS) suites. The oil deposits are associated with lithologically limited, tectonically screened and mixed type of traps. The Shewhart method was used, which makes it possible to optimally regulate the development process and analyze deviations in the process and determine the causes during development. The following development indicators were used in the modeling: oil and water recovery by years and liquid withdrawal, development rate and the number of wells drilled in the development cycle. For the active involvement of stagnant areas in development, a method for determining the optimal moment of impact on an oil deposit is proposed. At a late stage of field development, special technologies that provide conditions for displacing residual oil are the most effective. Injection of a water-gas mixture into field objects and periodic impact on layers is considered appropriate for increasing oil recovery from deposits. The effectiveness of the adopted approaches to optimizing the development system is assessed as moderate. Using these approaches, it is possible to increase oil recovery by 5-6%.