US 5,209,651 A · Multiple engine deep well pump

Abstract

A deep well pump for positioning in a bottom hole assembly and having at least one fluid pump and at least two fluid powered motors with the pump and motor pistons carried in alignment on the piston rod. The pump includes passages for delivering a power fluid to one end of each of the motor cylinders and for receiving exhaust fluid from the other end of the motor cylinders, and a valve for reversing this operation. A first sleeve is positioned around the first motor cylinder defining a power fluid path from one end of the first cylinder to one end of the second cylinder, a second sleeve is positioned around the first sleeve defining an exhaust fluid path from the other end of the first motor cylinder, and a third sleeve is positioned around the second motor cylinder defining an exhaust fluid path from the other end of the second motor cylinder, with the first and second exhaust fluid paths interconnected. When the valve reverses the operation, the power fluid paths become exhaust fluid paths and the exhaust fluid paths become power fluid paths.

Drawings

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Claims6

Dependent claims

In a deep well pump having at least one fluid pump with a pump cylinder and a pump piston reciprocating in said pump cylinder and carried on a piston rod, for positioning in a bottom hole assembly for a closed power fluid system and having an inner wall, the improvement including in combination:

first and second fluid powered motors, with each of said motors having a motor cylinder and a motor piston reciprocating in the motor cylinder, with said first and second motor pistons carried on said piston rod;
first means for delivering a power fluid to one end of said first motor cylinder;
second means for delivering a power fluid to one end of said second motor cylinder;
a first sleeve positioned around said first motor cylinder defining a power fluid path between said first sleeve and said first cylinder from said one end of said first cylinder to said one end of said second cylinder;
a second sleeve positioned around said first sleeve defining a first exhaust fluid path between said second sleeve and said first sleeve from the other end of said first motor cylinder;
a third sleeve positioned around said second motor cylinder defining a second exhaust fluid path between said third sleeve and said second cylinder from the other end of said second cylinder;
coupling means interconnecting said first and second exhaust fluid paths;
annular seal groove means in the outer periphery of the pump for receiving seal ring means for sealing engagement of the pump with said bottom hole assembly inner wall at a single location;
third means for defining a third exhaust fluid path from said first and second exhaust fluid paths, said third exhaust fluid path including a path between said second and third sleeves and said bottom hole assembly inner wall, and means defining an outlet opening through said bottom hole assembly at said seal ring means in said annular seal groove means for flow of spent power fluid from said motors into a well casing,
with the only seal below said seal ring means being at the lower end of said deep well pump below the fluid pump thereof, and with said annular seal groove means including a pair of annular seal grooves in the outer periphery of said first means for a pair of seal rings for sealing engagement with said bottom hole assembly inner wall at a location adjacent the top of the pump.

7 more elements

Dependencies are inferred from the claim text.

Description2,023 words

Summary757 words

#This invention relates to deep well pumps of the type widely used for production of oil from deeper wells. A conventional fluid operated deep well pump is shown in U.S. Pat. No. 2,081,223, and the present invention is an improvement on the pump shown in that patent.

#A typical deep well pump has a fluid powered motor and a fluid pump with the motor piston and the pump piston in axial alignment on a piston rod.

#A typical pump is in the order of 1.9 to 3.8 inches diameter and 6.5 to 25 feet long, and is positioned in the bottom hole assembly of the well casing. The outside diameter of the bottom hole assembly typically is in the order of 4 to 8 inches and the inside diameter of the well casing typically is in the order of 41/2 to 9 inches. The pump as shown in the U.S. Pat. No. 2,081,223 has a single annular seal between the pump and the bottom hole assembly adjacent the upper end of the pump.

Brief description of the drawings4 figures

#FIG. 1 is a vertical sectional view of a deep well pump incorporating the presently preferred embodiment of the invention;

#FIG. 2 is a downward continuation of FIG. 1;

#FIG. 3 is a downward continuation of FIG. 2; and

Detailed description1,218 words

#The deep well pump of the present invention is an improvement on that shown in U.S. Pat. No. 2,081,223. Reference may be made to that patent and to the book Theory and Applications of Hydraulic Oil Well Pumps by C. J. Coberly, published by Kobe, Inc., Huntington Park, Calif. 1961 for details of construction and operation of the entire pump. The present invention is directed to an improvement in the motor arrangement and therefore only the motor or upper portion of the pump is illustrated and described.

#The deep well pump as shown in FIGS. 1-4 includes a valve assembly 11, an upper motor 12, and a lower motor 13, with the motors positioned axially along a piston rod 14. The piston rod continues downward to one or more fluid pumps which are conventional in construction and operation and are not illustrated herein. Reference may be made to U.S. Pat. No. 2,081,223 for details of the lower end of the pump, with the corresponding to section line 16-16 of the U.S. Pat. No. 2,081,223.

#The motor 12 includes a cylinder 18 and a piston 19, and the motor 13 includes a cylinder 20 and a piston 21. Conventional annular grooves 19a, 21a are provided in the pistons for packing (not shown). A sleeve 22 is positioned around the motor cylinder 18, and a sleeve 23 is positioned around the sleeve 22. A sleeve 24 is positioned around the motor cylinder 20. A fluid path 25 is provided between the motor cylinder 18 and the sleeve 22. Another fluid path 26 is provided between the sleeve 22 and the sleeve 23. Another fluid path 27 is provided between the motor cylinder 20 and the sleeve 24. The sleeves 23 and 24 are joined by a middle plug 28.

Facts

Application

07/753,852Filed 3 Sep 1991 · division

Priority

29 Mar 1990

Granted

11 May 1993

Term ended

11 May 2010

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification2 codes

F04B 47/08
Having motor-pump units situated at great depth: the motors being actuated by fluid
F04B
Positive-displacement machines for liquids

Description2,023 words

Summary757 words

#A typical deep well pump has a fluid powered motor and a fluid pump with the motor piston and the pump piston in axial alignment on a piston rod.

Brief description of the drawings4 figures

#FIG. 1 is a vertical sectional view of a deep well pump incorporating the presently preferred embodiment of the invention;

#FIG. 2 is a downward continuation of FIG. 1;

#FIG. 3 is a downward continuation of FIG. 2; and

Detailed description1,218 words

Multiple engine deep well pump

Life of this patent

Multiple engine deep well pump

Life of this patent

Life of this patent

Abstract

Drawings

Claims6

Description2,023 words

Classification2 codes

Life of this patent

Description2,023 words