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US 4,440,231 AGranted
Downhole pump with safety valve
AssigneeConoco Inc.
InventorAlbert E. Martin
Life of this patent
Estimating the term…
Abstract
Apparatus and methods are provided for installing and removing a downhole rod pump form a well while preventing flow of fluids from the well through a production tubing string.
Claims9
A downhole pump assembly, comprising:
- a tubing string;
- a seating means, connected to a lower end of said tubing string, for seating a downhole pump;
- tubing extension means connected to said seating means and extending downward therefrom;
- valve means connected to said tubing extension means for selectively opening and closing said tubing extension means to thereby communicate an interior of said tubing string with and isolate said interior of said tubing string from a well bore;
- a pump adapted to seat in said seating means;
- and
- valve actuating means, associated with said pump, for opening and holding open said valve means when said pump is seated in said seating means and for closing said valve means when said pump is unseated from said seating means.
4 more elements
A method of installing a rod pump in a well, said method comprising the steps of:
- providing a flapper valve means on a lower end of a tubing extension below a seating means connected to a production tubing string suspended in said well;
- attaching said rod pump to a lower end of a sucker rod string, said sucker rod string having a polished rod at an upper end thereof;
- attaching a dip tube to a lower end of said rod pump;
- lowering said sucker rod string, rod pump, and dip tube into said production tubing to a first position wherein a lower end of said dip tube is above said flapper valve;
- sealing said polished rod within a stuffing box attached to an upper end of said production tubing;
- and then
- further lowering said sucker rod string and thereby pushing said flapper valve open with said dip tube and then seating said rod pump in said seating means.
4 more elements
Dependencies are inferred from the claim text.