Multi-stage hydraulic jet pump

Abstract

A multi-stage hydraulic jet pump for use in downhole environments is described.

I claim: 
     
         1 . A multi-stage jet pump, comprising a first stage jet pump, a second stage jet pump, and a production fluid inlet, wherein a first portion of power fluid is provided to said first stage jet pump, a second portion of said power fluid is supplied to said second stage jet pump, and wherein the output of mixed power fluid and production fluid from said first stage jet pump is mixed with additional power fluid in said second stage jet pump. 
     
     
         2 . The multi-stage jet pump of  claim 1 , additionally comprising a pressure reduction device in said first stage jet pump, wherein said pressure reduction device reduces the pressure of said first portion of power fluid. 
     
     
         3 . The multi-stage jet pump of  claim 2 , wherein said pressure reduction device is an orifice plate. 
     
     
         4 . The multi-stage jet pump of  claim 1 , additionally comprising a bottom hole assembly, wherein said bottom hole assembly divides said power fluid into said first portion of power fluid and said second portion of power fluid.