Earth’s Cryosphere, 2017, Vol. XXI, No. 5, p. 76-81
INFLUENCE OF GAS WELL THERMAL INSULATION PARAMETERS ON THAWING INTENSITY OF PERMAFROST AND INTRAPERMAFROST GAS HYDRATES
Z.A.Vasil’eva, V.S. Yakushev
Gubkin Russian State University of Oil and Gas, Department of Gas Production,
65, Lenina ave., Moscow, 119991, Russia; zoyavaс@gmail.com
Based on the model of thermal interaction between a production well and the surrounding permafrost rock massif containing relic metastable hydrates, we estimated the intensity of permafrost thawing and associated intrapermafrost gas liberation, considering the parameters of thermal insulation of wells. For the first time, the inverse problem is solved where thermal insulation parameters of a well are defined at a given thaw radius through a given period of its operation. The dependence of necessary thermal conductivity of the flow string heat insulation on the thermal conductivity of cement at a given thaw radius has been obtained.
Permafrost, metastable gas hydrates, gas emission, phase transition boundary, radius of thermal influence of wells