Formation of the impermeable layer in the process of methane hydrate dissociation in porous media

被引:7
作者
Tsypkin, G. G. [1 ]
机构
[1] Russian Acad Sci, Ishlinsky Inst Problems Mech, Pr Vernadskogo 101, Moscow 119526, Russia
关键词
methane hydrate; ice; dissociation; crystallization; self-preservation; blocking of flow; GAS HYDRATE; RESERVOIR;
D O I
10.1134/S0015462817050076
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The problem of decomposition of methane hydrate coexisting with water in a highpermeability reservoir is considered. The asymptotic solution is obtained for the decomposition regime in the negative temperature domain. Energy estimates presented show that an impermeable layer saturated with a hydrate-icemixture can be formed in reservoirs with initial positive temperature. The mathematical model of the process of hydrate decomposition is formulated under the assumption on the presence of such a layer in a high-permeability reservoir. In this case the problem is reduced to a purely thermal problem with two unknown moving boundaries. The water-ice phase transition takes place on the leading boundary, while hydrate dissociates at negative temperatures on the slower boundary. The conditions of existence of the layer saturated with a hydrate-ice mixture which is implemented in reservoirs with the high hydrate content are investigated.
引用
收藏
页码:657 / 665
页数:9
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