Jar stroke accelerator for pumpdown well tool

Claim 2

A jarring stroke accelerator for pumpdown well tools including: a cylinder member; a piston movable longitudinally in said cylinder member; a piston rod connected with said piston and extending outwardly from said cylinder longitudinally beyond one end thereof; means at the other end of the said cylinder and at said projecting end of said piston rod for connecting the same to a string of pumpdown well tools including a jarring device; means sealing between the piston and the cylinder bore wall; said piston and rod when movable longitudinally of said cylinder producing a region of reduced pressure in said cylinder to permit said cylinder and piston to move quickly relative to each other in the direction of such region of reduced pressure to permit operation of a jarring device by the pumpdown well tools.

Claim 3

A jarring stroke accelerator for use in a string of pump down tools comprising at least one pumpdown locomotive and a jarring device for operation in a well by operating fluid movement of said pumpdown well tool string including: a cylinder; a piston movable in the cylinder; a piston rod connected with the piston and projecting from the cylinder; means for connecting the projecting end of the rod to the pumpdown well tool string adjacent one of said pumpdown locomotive and said jarring device; means for connecting the cylinder of the accelerator to the pumpdown well tool string adjacent the other of the pumpdown locomotive and the jarring device in said pumpdown tool string; means for moving the piston and cylinder longitudinally in one direction relative to each other to produce a region of reduced pressure in the cylinder between the piston and the cylinder and between the pumpdown locomotive and the jarring device connected to the accelerator; said piston and cylinder of the accelerator being movable longitudinally relative to each other in an opposite direction to eliminate the region of reduced pressure within the accelerator cylinder to produce a rapid movement of the jarring device connected with the accelerator without disturbing the column of operating fluids in the system.

Claim 4

A jarring stroke accelerator for use in a string of pump down tools comprising at least one pumpdown locomotive and a jarring device for operation in a well by operating fluid movement of said pumpdown well tool string including: a cylinder; a piston movable in the cylinder; a piston rod connected with the piston and projecting from the cylinder; means for connecting the projecting end of the rod to the pumpdown well tool string adjacent one of said pumpdown locomotive and said jarring device; means for connecting the cylinder of the accelerator to the pumpdown well tool string adjacent the other of the pumpdown locomotive and the jarring device in said pumpdown tool string; means for moving the piston and cylinder longitudinally in one direction relative to each other to produce a region of reduced pressure in the cylinder between the piston and the cylinder and between the pumpdown locomotive and the jarring device connected to the accelerator; said piston and cylinder of the accelerator being movable longitudinally relative to each other in an opposite direction to eliminate the region of reduced pressure within the accelerator cylinder to produce a rapid movement of the jarring device connected with the accelerator without disturbing the column of operating fluids in the system.

Claim 5

A device of the character set forth in claim 2 wherein the accelerator piston and cylinder are movable longitudinally in one direction from telescoped to extended position to create a region of reduced pressure in the cylinder between the piston and the cylinder; and the piston and cylinder are movable longitudinally in the opposite direction with respect to each other to collapse the region of reduced pressure to produce a sudden movement of the pumpdown tools connected with the accelerator by operating fluid movement.

Claim 6

An accelerator of the character set forth in claim 2 wherein the piston and cylinder are movable longitudinally from extended to telescoped position to produce a region of reduced pressure in the cylinder between the piston and the cylinder; and said piston and cylinder are movable longitudinally from telescoped to extended position to collapse said region of reduced pressure to produce sudden movement of the pumpdown tools connected with the accelerator by movement of the operating fluid in the well.

Claim 7

For use in a pumpdown well installation having a U-tube flow path with a circulating operating fluid contained in said flow path, a string of pumpdown well tools in said flow path operable therein by movement by the fluid in the U-tube flow path including: a jarring device of a delayed action quick release type; and a jarring stroke accelerator for the jarring device comprising: a cylinder member having a bore; a piston movable longitudinally in the bore of said cylinder member; a piston rod connected with said piston and extending outwardly from said cylinder member longitudinally beyond one end thereof; means at the other end of the said cylinder member and at said projecting end of said piston rod for connecting the same to said string of pumpdown well tools adjacent said jarring device; means sealing between the piston and the cylinder bore wall; said piston and rod when movable longitudinally of said cylinder producing a region of reduced pressure in said cylinder bore to permit said cylinder and piston to move quickly relative to each other in the direction of such region of reduced pressure to permit operation of said jarring device by the movement of the circulating operating fluid acting on said pumpdown well tool string.

Claim 8

For use in a pumpdown well installation having a U-tube flow path with a circulating operating fluid contained in said flow path, a string of pumpdown well tools in said flow path operable therein by movement by the fluid in the U-tube flow path including: a jarring device of a delayed action quick release type; and a jarring stroke accelerator for the jarring device comprising: a cylinder member having a bore; a piston movable longitudinally in the bore of said cylinder member; a piston rod connected with said piston and extending outwardly from said cylinder member longitudinally beyond one end thereof; means at the other end of the said cylinder member and at said projecting end of said piston rod for connecting the same to said string of pumpdown well tools adjacent said jarring device; means sealing between the piston and the cylinder bore wall; said piston and rod when movable longitudinally of said cylinder producing a region of reduced pressure in said cylinder bore to permit said cylinder and piston to move quickly relative to each other in the direction of such region of reduced pressure to permit operation of said jarring device by the movement of the circulating operating fluid acting on said pumpdown well tool string.

Claim 9

A pumpdown well tool string including: pumpdown locomotive means; a jarring stroke accelerator connected at one end with said pumpdown locomotive means; a jarring device connected with the other end of said jarring stroke accelerator; and a well tool connected with said jarring device for actuation thereby, said accelerator comprising: a cylinder member having a longitudinal bore; a piston movable longitudinally in the bore of said cylinder member; a piston rod connected with said piston and extending outwardly from said cylinder member longitudinally beyond one end thereof; means sealing between the piston and the cylinder member bore wall; said piston and rod when movable longitudinally of said cylinder member bore producing a region of reduced pressure in said cylinder member bore to permit said cylinder member and piston to move quickly relative to each other in the direction of such region of reduced pressure to permit operation of said jarring device by movement of the pumpdown locomotive means to actuate the well tool connected to the jarring device.

Claim 10

A pumpdown well tool string including: pumpdown locomotive means; a jarring stroke accelerator connected at one end with said pumpdown locomotive means; a jarring device connected with the other end of said jarring stroke accelerator; and a well tool connected with said jarring device for actuation thereby, said accelerator comprising: a cylinder member having a longitudinal bore; a piston movable longitudinally in the bore of said cylinder member; a piston rod connected with said piston and extending outwardly from said cylinder member longitudinally beyond one end thereof; means sealing between the piston and the cylinder member bore wall; said piston and rod when movable longitudinally of said cylinder member bore producing a region of reduced pressure in said cylinder member bore to permit said cylinder member and piston to move quickly relative to each other in the direction of such region of reduced pressure to permit operation of said jarring device by movement of the pumpdown locomotive means to actuate the well tool connected to the jarring device.

Claim 13

A jarring stroke accelerator of the character set forth in claim 1 which includes: inlet opening means into said cylinder member adjaceNt each end thereof; means in one of said inlet opening means for closing said opening means against passage of fluid pressure whereby movement of the piston in the cylinder member produces said region of reduced pressure therein.

Claim 14

A jarring stroke accelerator of the character set forth in claim 1 wherein sealing means is provided between the end of the cylinder and the projecting piston rod for sealing therebetween; inlet opening means into said cylinder adjacent each end thereof; means in one of said inlet opening means for closing the same against passage of fluid pressure whereby movement of the piston in the cylinder member produces said region of reduced pressure therein; said closure means being selectively secured in a selected one of said inlet opening means to provide said region of reduced pressure on a selected side of said piston in said cylinder member.

Claim 15

A jarring stroke accelerator of the character set forth in claim 1 wherein: said piston and rod comprise a plurality of members, one telescoped within the other; means is provided for securing said plurality of members together for movement as a unit, said securing means being releasable to permit independent movement of said members relative to each other to provide an increased stroke and an increased region of reduced pressure in the cylinder member.

Claim 16

A jarring stroke accelerator of the character set forth in claim 10 wherein: one of said plurality of members comprises a piston and a tubular stem movable in the cylinder member; sealing means is provided on said piston sealing between the piston and cylinder member; second sealing means is provided between said tubular stem and said cylinder member at one end of said cylinder member for sealing therebetween; a second piston and rod member is movable in the bore of said tubular stem with one end of said rod projecting from the bore of the stem, means sealing between said second piston and said tubular stem; and means for sealing between said rod and said tubular stem at the end of said stem opposite the piston thereon.

Claim 17

A jarring stroke accelerator of the character set forth in claim 1 wherein said rod comprises a tubular stem having a piston thereon; a stationary rod is disposed in the tubular stem and is secured to one end of the cylinder member and extends to the opposite end thereof and is disposed to telescope into and out of said tubular stem; sealing means is provided for sealing between said piston and said cylinder and second sealing means is provided for sealing between said piston and said stationary rod; and means is provided for removably closing the bore of said tubular stem at the end thereof opposite the piston thereon.

Claim 18

A method of the character set forth in claim 7 including: the additional step of further moving the pumpdown well tool string by movement of the operating fluid in said installation after said jarring device has been actuated.

Claim 21

A jarring stroke accelerator of the character set fortH in claim 1 wherein the sealing means provided sealing between the piston and the bore wall of the cylinder member comprises a one-way seal on said piston.

Claim 22

A jarring stroke accelerator of the character set forth in claim 8 wherein the means in the inlet opening means of said cylinder member for closing the said opening means comprises a one-way check valve by preventing flow of fluids through the inlet opening means into the cylinder member bore.