US3703926A — Downhole hydraulic pump and engine improvements

Claim 1

Independent Claim 295 words

A hydraulic actuated downhole production pump assembly for pumping fluid from a fluid producing zone to ground level; said pump assembly including engine means, pump means, power fluid inlet means, spent power fluid outlet means, production fluid inlet means, and production fluid outlet means; said engine having a control valve means, a working cylinder, an engine piston reciprocatingly received within said working cylinder and dividing said cylinder into a lower and upper chamber, a hollow valve control rod attached to said engine piston and connected to said valve means for moving said valve means from a first to a second position in response to the position of said engine piston; said pump means having a pump cylinder, a production piston reciprocatingly received within said pump cylinder and dividing said pump cylinder into a lower and an upper chamber, a connecting rod affixed to said engine piston and to said production piston, pump valve means connecting said production fluid inlet means and said production fluid outlet means to the lower chamber of said pump cylinder to enable production fluid to be forced through said pump means; means connecting said power fluid inlet means to said hollow valve control rod, means forming a passageway from said hollow valve control rod, through said engine piston, and into the lower chamber of said working cylinder; said lower chamber of said working cylinder being in communication with said upper chamber of said pump cylinder; said control valve means, when in the first position, connects said power fluid to said upper chamber of said working cylinder; said control valve means, when in the second position, connects said upper chamber of said working cylinder to said spent power fluid outlet means to thereby cause said engine means to reciprocate said pump piston.

Claim 2

Dependent Claim 295 words

A hydraulic actuated downhole production pump assembly for pumping fluid from a fluid producing zone to ground level; said pump assembly including engine means, pump means, power fluid inlet means, spent power fluid outlet means, production fluid inlet means, and production fluid outlet means; said engine having a control valve means, a working cylinder, an engine piston reciprocatingly received within said working cylinder and dividing said cylinder into a lower and upper chamber, a hollow valve control rod attached to said engine piston and connected to said valve means for moving said valve means from a first to a second position in response to the position of said engine piston; said pump means having a pump cylinder, a production piston reciprocatingly received within said pump cylinder and dividing said pump cylinder into a lower and an upper chamber, a connecting rod affixed to said engine piston and to said production piston, pump valve means connecting said production fluid inlet means and said production fluid outlet means to the lower chamber of said pump cylinder to enable production fluid to be forced through said pump means; means connecting said power fluid inlet means to said hollow valve control rod, means forming a passageway from said hollow valve control rod, through said engine piston, and into the lower chamber of said working cylinder; said lower chamber of said working cylinder being in communication with said upper chamber of said pump cylinder; said control valve means, when in the first position, connects said power fluid to said upper chamber of said working cylinder; said control valve means, when in the second position, connects said upper chamber of said working cylinder to said spent power fluid outlet means to thereby cause said engine means to reciprocate said pump piston.

Claim 3

Dependent Claim 115 words

The downhole production pump assembly of claim 1, and further including a second pump cylinder radially spaced apart from the first recited pump cylinder; a second production piston reciprocatingly received within said second pump cylinder and dividing said second pump cylinder into a lower and upper chamber; a second connecting rod affixed to said engine piston and to said second production piston; another pump valve means connected to the last recited lower chamber for conducting fluid flow from another production fluid inlet to another production fluid outlet; the last recited upper chamber being in fluid communication with the upper chamber of the first recited pump cylinder and with the lower chamber of said working cylinder.

Claim 4

Dependent Claim 37 words

The improvement of claim 2, and further including means by which the lower chamber of said second pump cylinder is flow connected to another production zone which is spaced apart from the first recited fluid producing zone.

Claim 5

Dependent Claim 229 words

The improvement of claim 2, and further including means forming a hollow stInger, said stinger being affixed to and depending from said pump means the interior of said stinger forming the first recited production fluid inlet; a standing valve assembly including a member, means by which said member is attached to structure associated with a well bore; a central member telescopingly received within said member, means forming a central bore through said central member for slidably receiving said stinger therein; means forming spaced apart ports in said member, means forming spaced apart ports in said central member, means by which one of each port in said member is aligned with one of said ports in said central member when said central member is in a first position with respect to said member, and misaligned with respect to each other when said central member is in a second position with respect to said member; means forming a flow path which enables fluid to flow from one fluid producing formation, through a pair of aligned ports, and into said hollow stinger; means forming a flow path which enables fluid to flow from another fluid producing formation, through another pair of aligned ports, and into the first recited production inlet; whereby, fluid produced from two spaced apart formations can be produced by the pump and caused to flow along separate flow paths.

Claim 6

Dependent Claim 109 words

The improvement of claim 4, and further including means forming a flow path from one of said production outlets to the surface of the ground; means forming another flow path from the second recited production outlet to the surface of the ground, whereby: said pump, when properly seated on said central member, produces fluid from two spaced apart production zones along separate flow paths, and; when said pump is removed from said central member, the central member moves with respect to said member to thereby misalign the pairs of ports in said member and said central member to thereby preclude intermingling fluid from the spaced apart fluid producing zones.

Claim 7

Dependent Claim 292 words

A pump assembly for pumping a produced fluid from a production fluid inlet to a production fluid outlet by using a power fluid; said pump assembly including means forming an engine, a pump, a power fluid inlet, a spent power fluid outlet, a production fluid inlet, and a produced fluid outlet; said engine having a valve means, a working cylinder, an engine piston, a hollow valve control rod extending from said piston and to said valve means for controlling the action of said valve means; said pump including a pump cylinder which is located within a depending marginal portion of said working cylinder, a pump piston reciprocatingly received within said pump cylinder; means interconnecting said engine piston to said pump piston; check valve mean by which one end of said pump cylinder is connected to said production fluid inlet and to said production fluid outlet to cause production fluid to be pumped when said pump piston is reciprocated by said engine; said pump cylinder and said working cylinder having adjacent end portions in fluid communication with each other; means forming a flow path for conducting power fluid from said power fluid inlet, through said hollow valve control rod, through said engine piston, and into fluid communication with the adjacent end portions of the working cylinder and pump cylinder; said valve means connecting the power fluid inlet to a cylinder chamber formed by the portion of the working cylinder above said engine piston when said hollow control rod is moved into one position by the engine piston; and, said valve means connecting the spent power fluid outlet to said cylinder chamber of the working cylinder above said engine piston when said hollow control rod is moved into another position by the engine piston.

Claim 8

Dependent Claim 292 words

A pump assembly for pumping a produced fluid from a production fluid inlet to a production fluid outlet by using a power fluid; said pump assembly including means forming an engine, a pump, a power fluid inlet, a spent power fluid outlet, a production fluid inlet, and a produced fluid outlet; said engine having a valve means, a working cylinder, an engine piston, a hollow valve control rod extending from said piston and to said valve means for controlling the action of said valve means; said pump including a pump cylinder which is located within a depending marginal portion of said working cylinder, a pump piston reciprocatingly received within said pump cylinder; means interconnecting said engine piston to said pump piston; check valve mean by which one end of said pump cylinder is connected to said production fluid inlet and to said production fluid outlet to cause production fluid to be pumped when said pump piston is reciprocated by said engine; said pump cylinder and said working cylinder having adjacent end portions in fluid communication with each other; means forming a flow path for conducting power fluid from said power fluid inlet, through said hollow valve control rod, through said engine piston, and into fluid communication with the adjacent end portions of the working cylinder and pump cylinder; said valve means connecting the power fluid inlet to a cylinder chamber formed by the portion of the working cylinder above said engine piston when said hollow control rod is moved into one position by the engine piston; and, said valve means connecting the spent power fluid outlet to said cylinder chamber of the working cylinder above said engine piston when said hollow control rod is moved into another position by the engine piston.

Claim 9

Dependent Claim 112 words

The pump assembly of claim 6, and further including a second pump cylinder radially spaced apart from the first recited pump cylinder; a second production piston reciprocatingly received within said second pump cylinder and dividing said Second pump cylinder into a lower and upper chamber; a second connecting rod affixed to said engine piston and to said second production piston; pump valve means connected to the last recited lower chamber for conducting fluid flow from a production fluid inlet to a production fluid outlet; the last recited upper chamber being in fluid communication with the upper chamber of the first recited pump cylinder and with the lower chamber of said working cylinder.

Claim 10

Dependent Claim 37 words

The improvement of claim 7, and further including means by which the lower chamber of said second pump cylinder is flow connected to a production zone which is spaced apart from the first recited fluid producing zone.

Claim 11

Dependent Claim 207 words

The improvement of claim 7 and further including means forming a hollow stinger, stinger being affixed to and depending from said pump assembly, the interior of said stinger forming the recited production fluid inlet; a standing valve assembly including a member, means by which said member is attached to structure of a well bore; a central member telescopingly received within said member, means forming a central bore through said central member for slidably receiving said stinger therein; means forming spaced apart ports in said member, means forming spaced apart ports in said central member, one of each ports in said member being aligned with one of said ports in said central member when said central member is in a first position with respect to said member, and misaligned with respect to each other when in a second position; means forming a flow path which enables fluid to flow from one fluid producing formation, through a pair of aligned ports, and into said hollow stinger; means forming a flow path which enables fluid to flow from another fluid producing formation, through another pair of aligned ports, and into the first recited production inlet, whereby fluid produced from two spaced apart formations can be produced along separate flow paths.

Claim 12

Dependent Claim 108 words

The improvement of claim 9, and further including means forming a flow path from one of said production outlets to the surface of the ground; means forming another flow path from the second recited production outlet to the surface of the ground, whereby: said pump, when properly seated on said central member, produces fluid from two spaced apart production zones along separate flow paths, and; when said pump is removed from said central member, the central member moves with respect to said member to thereby misalign the pairs of ports in said member and said central member to preclude intermingling fluid from the spaced apart fluid producing zones.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-11-28	1976-05-29	1976-11-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-11-28	1980-05-29	1980-11-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-11-28	1984-05-29	1984-11-28	$7700.00	Window Closed / Lapsed

Downhole hydraulic pump and engine improvements

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