THERMAL INTERACTION OF A GAS WELL CLUSTER WITH PERMAFROST ROCKS OF THE MOST PROMISING DEPOSITS OF CENTRAL YAKUTIYA

The results of a numerical experiment to determine the thermal impact of a gas well cluster on permafrost rocks are given for the conditions of four deposits of Central Yakutiya, Middle-Vilyuy (Srednevilyuiskoe), Middle-Tyung (Srednetyungskoe), Sobolokh–Nidzhili (Sobolokh-Nidzhilinskoe), and Tolon–Mastakh (Tolon-Mastakhskoe). An approximate mathematical problem is solved in a conjugate formulation. In this case, the process of melting of permafrost rocks is described within the framework of a three-dimensional Stefan problem, and the motion of real gas in wells is described within the framework of tubular hydraulics. Use has been made of real data for temperature well logging, formation pressure and temperature, well fl ow rate, gas composition, and thermophysical properties of rocks. The melting of frozen rock depending on the depth and time has been calculated, and instants of time for linkage of thaw zones of neighboring wells have also been computed.
   
Author:  V. A. Ivanov and I. I. Rozhin
Keywords:  permafrost rocks, gas well cluster, Stefan problem, mathematical modeling
Page:  1123