OPTIMIZATION OF GAS WELLS OPERATION AT THE YAMBURG GAS FIELD

Abstract

At present, many large deposits of the north of the West Siberian Plain are at a late stage of development, characterized by low reservoir pressures, high water cut, and the risk of reservoir destruction. At this stage of devel- opment, the exploitation of gas wells is complicated by the accumulation of condensation and formation water on their bottom holes, leading to the erosion of pore cement and the subsequent formation of sand plugs. When a large volume of water is accumulated at the bottom, the well gets out of the operating mode, its production decreases, and its «self-pressing» can occur later. To prevent the failure of the well, it is necessary to adopt and implement technological solutions aimed at increasing the rate of lifting of well production to carry out liquid particles and mechanical impurities and to limit the inflow of produced water. One of the most common technologies for solving the problem of «self-pressing» of wells is the replacement of elevator pipes with smaller diameter pipes. At the moment, there are no single-valued criteria for selecting pipe diameters and evaluat- ing the efficiency of their replacement, but this replacement allows the wells to operate stably for a long time without sharp decrease of produc- tion rates, and to increase gas recovery. This article presents the basic principles of of tubing diameter selection and calculations for wells of Gas field No. 6 of Gazprom dobycha Yamburg. As a result of the calculation, recommendations are given for replacing 168 mm diameter tubing for 114 mm diameter tubing, since such tubing will allow obtaining the largest gas recovery from the formation at an acceptable well rate without addi- tional material costs.