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Jet-Assist ESP System for Gas Slugging Applications

IP.com Disclosure Number: IPCOM000237695D
Publication Date: 2014-Jul-02
Document File: 2 page(s) / 192K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure is for a system that breaks a gas lock of of ESP systems in slugging wells. The Problem: ESPs are density dependent on the fluid entering the pump for generating discharge pressure, and the required discharge pressure is dependent on fluid density already in the tubing string (discharge pressure necessary for upward flow that is). Thus when a drastic change in density occurs the pump will most likely not able to generate the necessary discharge pressure to keep fluid moving through the pump. This invention is for a way to quickly reduce the required discharge pressure so that the pump can recover quickly. The basis of the invention is a sliding sleeve that employs a properly supported shaft that runs through the center of the assembly to allow for shafts above and below the sliding sleeve to couple their respective shafts. The sliding sleeve also provides a means of voluntarily engaging and disengaging a seal that does not allow fluid to bypass axially between the sliding sleeve and its shaft. Sliding Sleeve 3 would be placed in a TTC ESP system between the Receiving Assembly and the Seal Assembly. This requires a Shaft 12 to run thru Sliding Sleeve 3 to connect Pump 1 shaft to Seal 4 shaft. The purpose of Seal 4 is to isolate motor oil 20 from well bore fluid 19. While Seal 4 must be in communication with well bore fluid it also has mechanical shaft seals that rotate with the shaft during operation. These mechanical seals (not shown in schematic) isolate well bore fluid from motor oil along the shaft, but cannot hold a differential pressure. With the sliding sleeve in the closed position and the ESP system not in operation, a bi-directional seal 23 would be required between Sliding Sleeve 3 and Seal 4 along Shaft 12. It would be required to disengage this bi-directional seal 23 prior to operating the ESP system due to the rapid rotation of the shaft (approximately 3600 rpm) or the bi-directional seal 23 would be destroyed. For this invention, Sliding Sleeve 3 would have an internal ported sleeve with a surface that would engage a seal with the shaft while in the closed position. When the ported sleeve is moved into the open position the seal surface would move along with it, disengaging its seal with the shaft. When the ported sleeve is moved back into the closed position the bi-directional seal would re-engage with the shaft. This system would provide a means of isolating well fluid from the portion of the well that resides uphole from Sliding Sleeve 3.

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Jet-Assist ESP System for Gas Slugging Applications

This disclosure is for a system that breaks a gas lock of of ESP systems in slugging wells. The Problem: ESPs are density dependent on the fluid entering the pump for generating discharge pressure, and the required discharge pressure is dependent on fluid density already in the tubing string (discharge pressure necessary for upward flow that is). Thus when a drastic change in density occurs the pump will most likely not able to generate the necessary discharge pressure to keep fluid moving through the pump. This invention is for a way to quickly reduce the required discharge pressure so that the pump can recover quickly.

The basis of the invention is a sliding sleeve that employs a properly supported shaft that runs through the center of the assembly to allow for shafts above and below the sliding sleeve to couple their respective shafts. The sliding sleeve also provides a means of voluntarily engaging and disengaging a seal that does not allow fluid to bypass axially between the sliding sleeve and its shaft. Sliding Sleeve 3 would be placed in a TTC ESP system between the Receiving Assembly and the Seal Assembly. This requires a Shaft 12 to run thru Sliding Sleeve 3 to connect Pump 1 shaft to Seal 4 shaft. The purpose of Seal 4 is to isolate motor oil 20 from well bore fluid 19. While Seal 4 must be in communication with well bore fluid it also has mechanical shaft seals that rotate with the shaft during operation. These m...