Structure Design of Coal Particle Washing Jet Pump Used in Coalbed Methane Wells and Basic Parameters Determination

Abstract

In view of the characteristic that the bottom pressure of Coalbed Methane Wells (CBM wells) is low and the structure of coal bed could be easily destructed, the author designed a kind of jet pump. The jet pump could improve efficiency of washing bottom-hole coal particle in condition of protecting the structure of coal reservoir. In this paper, we have analyzed the structure of jet pump and working principle; and given the method of calculation the basic parameters of jet pump on the basis of calculating the working efficiency of jet pump from the point of cavitation.