Hydraulic Powered Downhole Pump

Abstract

A hydraulically powered downhole jet pump is designed to provide greater flexibility in operations of wells producing oil, gas and/or water. The pump consists of a housing and a carrier assembly. The housing is attached to an inner threaded tubular member and run inside the well casing to a depth as required for optimal operations. The one piece carrier assembly is inserted and seals into the housing with proper orientation of the carrier assembly outlet ports with the housing outlet ports resulting from the combination of a helically or tapered cut guide on the exterior of the carrier assembly and an inward positioned pin in the housing.

1 . A jet pump assembly comprising:
 a housing adapted to be attached to a tubular string and having an outlet port,   a carrier assembly including a nozzle, a mixing tube and a diffuser section, positioned within the housing and having an exterior diameter smaller than the interior diameter of any portion of the housing or tubing whereby the carrier assembly can be removed from the housing as a unit by a reverse flow of fluid between the tubing string and a casing of a well.   
     
     
         2 . A jet pump assembly as claimed in  claim 1  further including a pin located at a bottom portion of the housing and a tapered surface on a lower portion of the carrier assembly whereby the carrier assembly is properly oriented within the housing. 
     
     
         3 . A jet pump assembly according to  claim 2  wherein the diffuser section of the carrier assembly includes an outlet which is aligned by the pin and the tapered surface with the housing outlet port. 
     
     
         4 . A jet pump assembly according to  claim 1  further including a fishing neck provided at a top portion of the carrier assembly. 
     
     
         5 . A jet pump assembly according to  claim 1  further including a retrievable check valve having a fishing neck positioned within a lower portion of the housing. 
     
     
         6 . A jet pump assembly according to  claim 1  wherein the housing includes an annular groove in an inner surface of the housing,
 a plurality of locking dogs captured by an upper portion of the carrier assembly and moveable into the annular groove, and 
 a removable blocking device temporarily blocking fluid flow through the carrier assembly. 
 
     
     
         7 . A jet pump assembly according to  claim 6  wherein the carrier assembly includes at its upper end a sealing mechanism to seal the annulus between the carrier assembly and the tubing interior as the carrier assembly is forced upwardly by fluid pressure. 
     
     
         8 . A jet pump assembly according to  claim 6  wherein the carrier assembly further includes a fishing neck at an upper portion thereof. 
     
     
         9 . A jet pump assembly according to  claim 1  further including at least one seal between the housing and the carrier assembly. 
     
     
         10 . A jet pump assembly according to  claim 6  further comprising a sliding sleeve having a fishing neck at its top portion and a shoulder adapter to engage and force outwardly the locking dogs when the sleeve is forced downwardly. 
     
     
         11 . A jet pump assembly according to  claim 9  further including a groove formed in the housing or the carrier assembly and the seal is located within the groove and sized initially to fit totally within the groove. 
     
     
         12 . A jet pump assembly according to  claim 1  wherein the diffuser section includes a fluid flow passageway in fluid communication with an opening in a circumferential wall portion of the carrier assembly. 
     
     
         13 . A jet pump assembly according to  claim 13  wherein at least one seal is formed of a swellable elastomer material. 
     
     
         14 . A jet pump assembly according to  claim 13  wherein at least one seal is formed of a shape memory material.