# US 5,704,772 A · Controller less resilient bladder pump for reduced diameter casing with long cycle

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- Number: US 5,704,772 A
- Document ID: US5704772A
- Status: Granted
- Kind: A
- Application number: 08/554,380
- Filed: 1995-11-08
- Granted: 1998-01-06
- Earliest claimed: 1995-11-08
- Inventors: Michael K. Breslin
- Web page: https://patentgrep.com/patent/US5704772A

## CPC

- F04B 43/10: Pumps having fluid drive
- E21B 28/00: Vibration generating arrangements for boreholes or wells, e.g. for stimulating production ({for fishing for or freeing objects E21B31/005;} for transmitting measuring-signals E21B47/14; for geophysical measurements G01V1/02)
- F04B 47/08: the motors being actuated by fluid
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A conventional vibrator for actuating small diameter pump is tapped at the small volume pressure chamber and communicated to a plugged, elongate hose, thus expanding the actuating pressure chamber of the vibrator conveniently to virtually any required volume within the small casing environment. With the expanded pressure chamber, cycle period of the vibrator can be extended to virtually any desired time cycle without performance limiting closure of the needle valve regulator. An elongate bladder forms the periodic pressure actuated positive displacement volume for the pump. By increased length of the bladder, correspondingly increased cycle pumping volume is provided for the pump. At the same time, bladder expansion provides sufficient pump inlet pressure to enable the use of free floating check valves. A high volume, slow cycle pump for the narrow casing environment results.

## Claims

### Claim 1

In a casing mounted pump having a pump inlet toward a bottom of the casing for receiving fluid to be pumped, a pump outlet to a top of the casing for discharging pumped fluid, the pump including,
a pump casing;
a bladder casing within the pump casing for containing periodic pressurization;
a collapsible bladder within the bladder casing having an inlet communicated to the pump inlet, an outlet communicated to the pump outlet, a resilient collapsible wall about an enclosed interior for collapsing the collapsible bladder responsive to pressure between the collapsible bladder and the bladder casing; and,
a vibrator having a compressed air inlet, a pressurizing chamber, and an air discharge vent for periodically discharging air to and from the bladder casing within the pump casing for expanding and collapsing the collapsible bladder for pumping fluid to and from the enclosed interior of the collapsible bladder;
the improvement to the pump comprising:
a tap through the vibrator for connecting the pressurizing chamber of the vibrator to an air reservoir exterior of the vibrator; and,
a conduit within the pump casing communicated to the tap and closed at an end for forming an expanded chamber for the air reservoir.

### Claim 2 (depends on 1)

In a casing mounted pump according to claim 1 and wherein:
the collapsible bladder comprises a resilient elongated bladder within the bladder casing.

### Claim 3

In a casing mounted pump having a pump inlet toward a bottom of the casing for receiving fluid to be pumped, a pump outlet to a top of the casing for discharging pumped fluid, the pump including,
a pump casing;
a bladder casing within the pump casing for containing periodic pressurization;
a collapsible bladder within the bladder casing having an inlet communicated to the pump inlet, an outlet communicated to the pump outlet, a resilient collapsible wall about an enclosed interior for collapsing the collapsible bladder responsive to pressure between the collapsible bladder and the bladder casing; and,
a vibrator having a compressed air inlet, a pressurizing chamber, and an air discharge vent for periodically discharging air to and from the bladder casing within the pump casing for expanding and collapsing the collapsible bladder for pumping fluid to and from the enclosed interior of the collapsible bladder;
the collapsible bladder comprises a resilient elongated bladder within the bladder casing.