| 摘要 |
An anti-gas locking apparatus for a downhole pump comprises a sleeve disposed below the pump and in fluid communication with the pump inlet, a housing disposed about the sleeve and fluidly communicating at its upper end with the well in which the pump is disposed, and a cross-over assembly communicating lower portions of the housing with the lower end of the sleeve. The cross-over assembly comprises a cross-over diffuser including a jacket member, the upper end of which mates with the lower end of the sleeve, and a dome member within the jacket member. Apertures are formed through the jacket member and dome member and webs extend between these members to form inlet passages into the interior of the dome member from the annulus between the housing and the sleeve and outlet passages about the dome member to the sleeve. An impeller is disposed within the jacket member below the dome member. Disclosed is an improved geometry of the cross-over diffuser in which webs forming the walls of the inlet and outlet passage spiral about the dome member with ever increasing vertical slope to a substantially vertical disposition and the diffuser is provided with similarly shaped flow shaping vanes within the outlet passages. The impeller is provided with vanes that increase in vertical dimension fromm the center of the impeller toward the periphery thereof so that, with the improved geometry of the diffuser, turbulence of well fluids passing through the diffuser is avoided to prevent evolution of gases in the diffuser.
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