Method of Retrieving a Flow Back Jet Pump from an Oil Well

Abstract

A jet pump assembly is adapted to be releasably attached to a tubular member of a tubular string in an oil well. The jet pump may be pumped out of the tubular string to the surface by a reverse flow of power fluid down the well between the tubular string and the casing of the well. Consequently the jet pump may be serviced or reconfigured to a direct pumping mode without the necessity of a wire line or other apparatus. An attachment tool is provided that attaches to a fishing neck on the jet pump and also includes a plurality of seal cups. The attachment tool includes a rod which is adapted to release a locking mechanism positioned in the jet pump.

I claim: 
     
         1 . A method of retrieving a jet pump from an oil well, the jet pump including a locking mechanism to prevent upward movement of the jet pump within the well and a fishing neck comprising;
 a) pumping down into the well an attachment tool having laches for engagement with the fishing neck of the jet pump,   b) unlocking the locking mechanism of the jet pump,   c) attaching the attachment tool to the fishing neck of the jet pump,   d) pumping up the attachment tool and jet pump to a top portion of the oil well.   
     
     
         2 . The method of  claim 1  wherein the jet pump can be operated in a direct flow or reverse flow configuration. 
     
     
         3 . The method of  claim 2  wherein the pump is installed in the reverse flow configuration in the well prior to removal. 
     
     
         4 . The method of  claim 1  wherein the attachment tool includes a plurality of seal cups facing downwardly whereby when upward flow is established the attachment tool and jet pump will be conveyed to a top portion of the well. 
     
     
         5 . The method of  claim 1  wherein the attachment tool includes a rod which is adapted to unlock one or more locking dogs located on the jet pump.