Down hole hydraulic pump

Claim 2

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; an upper power piston disposed in the upper portion of said working barrel; a lower power piston disposed in the lower portion of said working barrel; connecting rod means interconnecting said upper power piston and said lower power piston; a central divider block extending transversely across the central portion of said working barrel and sealingly separating the upper portion of said working barrel from the lower portion of said working barrel, said central divider block sealingly surrounding said connecting rod means, said connecting rod means extending slidingly through said central divider block; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power piston means, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said firstmentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston means therein; a slide valve assembly slidably positioned in said working barrel and including a first slide valve positioned in said working barrel on one side of said central divider block over one of said firstmentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned in said working barrel on the opposite side of said central divider block and over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; means interconnecting said first and second slide valves for concurrent movement, said interconnecting means extending slidingly through said central divider block; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and interconnecting means; means cooperating with said power pistons for transferring motion from said power pistons to said slide valve assembly; and a spring-biased cam follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement.

Claim 3

A hydraulic pump as defined in claim 1 wherein said pump includes one of said cam surfaces located on a portion of each of said slide valves; and wherein said pump further includes one of said cam follower devices bearing against each of said cam surfaces, each of said cam follower devices comprising: a rolling member contacting the respective cam surface and at least partially seated in an opening in the wall of said working barrel; and a spring mounted on the wall of the working barrel and biasing the rolling member against the cam surface.

Claim 4

A hydraulic pump as defined in claim 1 wherein said pump further includes a cam block mounted on said interconnecting means and carrying said cam surface; and wherein said cam follower device comprises a spring and ball assembly mounted in the wall of said working barrel and cooperating with said cam surface.

Claim 5

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; a power piston means slidably disposed in the lower portion of said working barrel for reciprocation therein; power fluid charging conduit means connected to, and communicating with, the interior of said working barreL at two locations spaced therealong for alternately driving said power piston means, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first mentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston means therein; a slide valve assembly slidably positioned in said working barrel and including a first slide valve positioned over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, sad second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; an actuator rod secured to said first slide valve and said second slide valve and extending axially in said working barrel; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and with the actuator rod interconnecting said first slide valve and second slide valve; a first collar secured around said actuator rod and positioned above said power piston; a second collar secured around said actuator rod and positioned below said power piston; a spring-biased cam follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement; a partition extending transversely across said working barrel between said slide valve assembly and said power piston and sealingly separating the portion of the working barrel containing said power piston from the portion of said working barrel containing said slide valve assembly, said partition slidingly receiving said actuator rod therethrough; and a divider block positioned between said first slide valve and said second slide valve and extending sealingly across said working barrel, and slidingly receiving said actuator rod therethrough.

Claim 6

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; a power piston means slidably disposed in the lower portion of said working barrel for reciprocation therein; power fluid charging conduit means connected to, and communicating with, the interior of said working barreL at two locations spaced therealong for alternately driving said power piston means, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first mentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston means therein; a slide valve assembly slidably positioned in said working barrel and including a first slide valve positioned over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, sad second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; an actuator rod secured to said first slide valve and said second slide valve and extending axially in said working barrel; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and with the actuator rod interconnecting said first slide valve and second slide valve; a first collar secured around said actuator rod and positioned above said power piston; a second collar secured around said actuator rod and positioned below said power piston; a spring-biased cam follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement; a partition extending transversely across said working barrel between said slide valve assembly and said power piston and sealingly separating the portion of the working barrel containing said power piston from the portion of said working barrel containing said slide valve assembly, said partition slidingly receiving said actuator rod therethrough; and a divider block positioned between said first slide valve and said second slide valve and extending sealingly across said working barrel, and slidingly receiving said actuator rod therethrough.

Claim 7

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; an upper power piston slidably positioned in the upper portion of said working barrel for reciprocation therein; a lower power piston slidably disposed in the lower portion of said working barrel for reciprocation therein; connecting rod means interconnecting said upper power piston and said lower power piston; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power pistons, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first-mentioned two locations for receiving power at different times during the reciprocation of said power pistons therein; a slide valve assembly slidably positioned in said working barrel in axial alignment with said power pistons and including a first slide valve positioned in said working barrel in axial alignmenT with said power pistons and over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable axially in said working barrel to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned in said working barrel in axial alignment with said power pistons and over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; means extending axially in said working barrel and interconnecting said first and second slide valves for concurrent axial movement in said working barrel; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and interconnecting means; means cooperating with said power piston means for transferring motion from said power piston means to said slide valve assembly; a spring-biased cm follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement; a standing valve housing secured to the lower end of said working barrel; a standing valve in said standing valve housing; means for conveying fluid from a fluid-producing formation around said pump to said standing valve housing; conduit means connected to said working barrel below said lower power piston for receiving production fluid from said working barrel; a second standing valve housing secured to the upper end of said working barrel; a second standing valve in said second standing valve housing; second conduit means connected to said second standing valve housing for receiving production fluid discharged through said second standing valve housing from said working barrel; and third conduit means connected to said working barrel above said upper power piston for conveying fluid from a fluid-producing formation around said pump to the upper portion of said working barrel.

Claim 8

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; an upper power piston slidably positioned in the upper portion of said working barrel for reciprocation therein; a lower power piston slidably disposed in the lower portion of said working barrel for reciprocation therein; connecting rod means interconnecting said upper power piston and said lower power piston; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power pistons, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first-mentioned two locations for receiving power at different times during the reciprocation of said power pistons therein; a slide valve assembly slidably positioned in said working barrel in axial alignment with said power pistons and including a first slide valve positioned in said working barrel in axial alignmenT with said power pistons and over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable axially in said working barrel to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned in said working barrel in axial alignment with said power pistons and over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; means extending axially in said working barrel and interconnecting said first and second slide valves for concurrent axial movement in said working barrel; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and interconnecting means; means cooperating with said power piston means for transferring motion from said power piston means to said slide valve assembly; a spring-biased cm follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement; a standing valve housing secured to the lower end of said working barrel; a standing valve in said standing valve housing; means for conveying fluid from a fluid-producing formation around said pump to said standing valve housing; conduit means connected to said working barrel below said lower power piston for receiving production fluid from said working barrel; a second standing valve housing secured to the upper end of said working barrel; a second standing valve in said second standing valve housing; second conduit means connected to said second standing valve housing for receiving production fluid discharged through said second standing valve housing from said working barrel; and third conduit means connected to said working barrel above said upper power piston for conveying fluid from a fluid-producing formation around said pump to the upper portion of said working barrel.

Claim 9

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; a power piston disposed in the lower portion of said working barrel; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power piston, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first-mentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston therein; a slide valve assembly slidably positioned in said working barrel and including a first slide valve positioned over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discHarge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; means interconnecting said first and second slide valves for concurrent movement; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and interconnecting means; means cooperating with said power piston for transferring motion from said power piston to said slide valve assembly; a spring-biased cam follower device resiliently bearing against said cam surface and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement; a partition extending transversely across said working barrel between said slide valve assembly and said power piston and sealingly separating the portion of the working barrel containing said power piston from the portion of said working barrel containing said slide valve assembly; a divider block positioned between said first slide valve and said second slide valve and extending sealingly across said working barrel; a pump barrel connected to the lower end of said working barrel; a pump piston slidably and reciprocably mounted in said pump barrel; means connecting said pump piston to said power piston for movement therewith; and traveling valve means in said pump piston for passing fluid from below to above said pump piston during the downward stroke thereof.

Claim 10

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; a power piston disposed in the lower portion of said working barrel; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power piston, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first-mentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston therein; a slide valve assembly slidably positioned in said working barrel and including a first slide valve positioned over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discHarge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; means interconnecting said first and second slide valves for concurrent movement; and a cam surface positioned adjacent said working barrel and movable with said first and second slide valves and interconnecting means; means cooperating with said power piston for transferring motion from said power piston to said slide valve assembly; a spring-biased cam follower device resiliently bearing against said cam surface and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement; a partition extending transversely across said working barrel between said slide valve assembly and said power piston and sealingly separating the portion of the working barrel containing said power piston from the portion of said working barrel containing said slide valve assembly; a divider block positioned between said first slide valve and said second slide valve and extending sealingly across said working barrel; a pump barrel connected to the lower end of said working barrel; a pump piston slidably and reciprocably mounted in said pump barrel; means connecting said pump piston to said power piston for movement therewith; and traveling valve means in said pump piston for passing fluid from below to above said pump piston during the downward stroke thereof.

Claim 11

A hydraulic pump as defined in claim 6 wherein said power fluid charging conduit means comprises: a first charging conduit connected at one end to the upper portion of said working barrel at a location aligned with said first slide valve, and connected at a second end to the lower portion of said working barrel at a location above said power piston; and a second charging conduit connected at one end to the upper portion of said working barrel at a location aligned with said first slide valve, and connected at a second end to the lower portion of said working barrel at a location below said power piston.

Claim 12

A hydraulic pump as defined in claim 7 wherein said power fluid discharge conduit means comprises: a first discharge conduit having one end connected to the lower portion of said working barrel below said power piston, and having a second end connected to the upper portion of said working barrel at a location aligned with said second slide valve; and a second discharge conduit having one end connected to the lower portion of said working barrel above said power piston, and having a second end connected to the upper portion of said working barrel at a location aligned with said second slide valve.

Claim 13

A hydraulic pump as defined in claim 8 and further characterized to include fluid passageway means for conveying fluid from a location within said working barrel above said partition to the surface.

Claim 14

A hydraulic pump as defined in claim 9 wherein said cam surface is formed on at least one of said slide valves.

Claim 15

A hydraulic pump as defined in claim 10 wherein said interconnecting means comprises an actuator rod secured to said first slide valve and said second slide valve and extending axially in said working barrel and slidingly through said divider block, partition and power piston; and wherein said means cooperating with said power piston means comprises: a first collar secured around said actuator rod and positioned about said power piston; and a second collar secured around said actuator rod and positioned below said power piston.

Claim 16

A hydraulic pump as defined in claim 11 wherein said fluid passageway means comprises: annulus-defining tubular means surrounding said working barrel; and a port through said working barrel between said Slide valves communicating with the annulus between said working barrel and tubular means.

Claim 17

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; a power piston slidably positioned in the lower portion of said working barrel for reciprocation therein; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power piston, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first-mentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston means therein; a slide valve assembly positioned in said working barrel in axial alignment with said power piston and slidably movable in said working barrel, said slide valve assembly including a first slide valve positioned in said working barrel in axial alignment with said power piston and over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; an actuator rod interconnecting said first and second slide valves and extending axially in said working barrel, said actuator rod being secured to said first and second slide valves; a cam surface positioned adjacent said working barrel and movable with said first and second slide valves, and with said actuator rod; a divider block positioned between said first slide valve and said second slide valve and extending transversely and sealingly across said working barrel; means cooperating with said power piston for transferring motion from said power piston to said slide valve assembly; and a spring-biased cam follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement.

Claim 18

A hydraulic pump comprising: a working barrel having an upper portion and a lower portion; a power piston slidably positioned in the lower portion of said working barrel for reciprocation therein; power fluid charging conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong for alternately driving said power piston, first in one direction in said working barrel, then in the opposite direction in said working barrel; power fluid discharge conduit means connected to, and communicating with, the interior of said working barrel at two locations spaced therealong, and spaced from said first-mentioned two locations for receiving power fluid discharged from said working barrel at different times during the reciprocation of said power piston means therein; a slide valve assembly positioned in said working barrel in axial alignment with said power piston and slidably movable in said working barrel, said slide valve assembly including a first slide valve positioned in said working barrel in axial alignment with said power piston and over one of said first-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid charging conduit means, said first slide valve being movable to a second position to open said one point of communication of the interior of the working barrel with said power fluid charging conduit means; a second slide valve positioned over one of said second-mentioned two locations to close one point of communication of the interior of said working barrel with said power fluid discharge conduit means, said second slide valve being movable to a second position to open said one point of communication of the interior of said working barrel with said power fluid discharge conduit means; an actuator rod interconnecting said first and second slide valves and extending axially in said working barrel, said actuator rod being secured to said first and second slide valves; a cam surface positioned adjacent said working barrel and movable with said first and second slide valves, and with said actuator rod; a divider block positioned between said first slide valve and said second slide valve and extending transversely and sealingly across said working barrel; means cooperating with said power piston for transferring motion from said power piston to said slide valve assembly; and a spring-biased cam follower device resiliently bearing against said cam surface, and substantially immovable in an axial direction in said working barrel, said cam follower device cooperating with said cam surface to alternately snap said slide valve assembly between two operating positions in said working barrel in a reciprocating movement.