Hydraulic well pumping method
US4237976A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Aug 13, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Production tubing extends through a well bore to a well producing formation, and after well fluid stops flowing through the tubing under reservoir pressure, the well fluid is hydraulically pumped to the surface through the existing tubing, which avoids pulling the tubing and replacing it with a separate tubing and bottom hole assembly. The existing tubing is perforated, and a conduit or passageway for fluid flow is landed in the tubing below the perforations. The conduit comprises a combination of elements which include a lower tubing stop affixed to the tubing below a packing mandrel sealed to the inside wall of the tubing, and a receptacle and check valve above the packing mandrel. An upper landing nipple already installed in the existing tubing provides means for landing equipment for perforating the tubing and for landing elements of the conduit. A free pump is pumped down the tubing, with an upper portion of the pump being seated on the upper landing nipple while a lower portion of the pump makes a sliding seal in the receptacle. The pump is operated to pump well fluid from the well up through the conduit and then out through the perforations in the tubing and up the annulus b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.