Standing valve assembly for an oil well pump
AssigneeOil Extractors, Inc.
InventorHenry C. Groff
Life of this patent
Estimating the term…
Abstract
An apparatus for connection to an oil well pump to improve its performance. The oil well pump is of the type having a traveling valve located within a barrel at the end of a string of production tubing and reciprocated by a string of sucker rods in the tubing. The apparatus includes a sub connected to the lower end of the production tubing. The barrel with a pump plunger and traveling valve is attached below the sub. The sub has a central passage and several valve passages. A tube is secured to the central passage. A piston reciprocates in the tube and is connected to the sucker rods at the top and to the pump plunger below. Standing valves are secured to the tops of the valve passages to allow only upward flow, isolating the pump plunger from the production column on the downstroke.
Claims5
An improved apparatus for use with a well pump, the pump being of the type having reciprocating pump means located at the end of a string of production tubing and actuated by a sucker rod within the tubing, the apparatus comprising in combination:
- a sub connected to and closing the lower end of the tubing to confine a column of production fluid therein;
- the sub having a first passage extending axially through the center of the sub and a second passage to the side of and parallel to the first passage;
- a single straight metal tube of single-piece construction secured to the sub and extending away from the first passage in alignment with the first passage;
- a piston closely and reciprocally received in the tube, the upper end of the piston being connected to the sucker rod for reciprocating the piston in the tube, the lower end of the piston being connected to the pump means for reciprocating the pump means in unison with the piston;
- the dimensions of the piston and tube being selected so as to seal the hydrostatic pressure resulting from the column of production fluid;
- and
- standing valve means in communication with the second passage for permitting upward flow of production fluid during upstroke of the pump means through the second passage and into the tubing, but preventing reverse flow therethrough during downstroke of the pump means;
- and
- centralizer means secured to the tube above the sub and in contact with the production tubing to maintain it in the center of the production tubing.
An improved oil well pump for attachment to the end of a string of production tubing and activated by a sucker rod within the tubing, comprising in combination;
- a sub connected to and closing the lower end of the tubing to confine a column of production fluid therein, the sub having a first passage extending axially through the center of the sub and a plurality of second passages on the side of and parallel to the first passage;
- a single straight metal tube of single-piece construction secured to the top of the first passage and extending upwardly along the axis of the sub;
- centralizer means above the sub and in contact with the production tubing for maintaining the tube in the center of the production tubing;
- a piston of length greater than the tube closely and reciprocally received in the tube, the upper end of the piston being connected to the sucker rod for reciprocating the piston in the tube;
- the dimensions of the piston and tube being selected so as to seal the hydrostatic pressure resulting from the column of production fluid;
- a barrel secured to the lower end of the sub;
- a plunger slidable in the barrel and connected to the lower end of the piston for reciprocal movement in unison with the piston;
- the plunger having a passage communicating production fluid below the plunger with production fluid above the plunger;
- traveling valve means in the passage of the plunger for allowing upward flow of production fluid but preventing downward flow;
- and
- a standing valve housing mounted to the top of each second passage, each housing having an axial bore, a side wall, and slots extending through the side wall;
- a seat located in the bore;
- and
- a ball carried in the bore above the seat, the ball seating in the seat to prevent downward production fluid flow, and unseating when the pressure in the production fluid column to allow fluid from the barrel to flow through the second passages, bore and slots into the production tubing.
Dependencies are inferred from the claim text.