Pumpdown apparatus and method
AssigneeCordax Evaluation Technologies Inc.
InventorCharanjit Singh Sandhu
Life of this patent
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Abstract
A shock absorber apparatus includes a rod; a tool connection on a first end of the rod; a piston on a second end of the rod; a flange on the rod between the tool connection and the piston; a ring connection slidably connected to the rod between the tool connection and the flange; a first spring between the ring connection and the flange to bias the ring connection axially away from the flange; a sleeve, connected to a second spring between the second spring and the piston, slidably encircling the piston and a portion of the rod, and extending past the piston to a pumpdown connection; and a fin. A method for a placing a tool in a landing ring of a drilling tubular includes using the shock absorber apparatus to absorb shocks caused by the landing operation.
Claims7
A shock absorber apparatus for a pumpdown operation, comprising:
- a rod;
- a tool connection on a first end of the rod;
- a piston on a second end of the rod;
- a flange on the rod between the tool connection and the piston;
- a ring connection slidably connected to the rod between the tool connection and the flange;
- a first spring on the rod between the ring connection and the flange to bias the ring connection axially away from the flange;
- a second spring on the rod between the flange and a sleeve connection, the second spring being configured to bias the flange axially away from the sleeve connection;
- a pumpdown connection;
- a sleeve,
- connected to the sleeve connection and the ring connection,
- slidably encircling the piston and a portion of the rod, and
- extending past the piston to the pumpdown connection;
- and
- a fin.
A method of placing a tool in a landing ring of a drilling tubular, comprising:
- pumping the tool, connected to a shock absorber apparatus, into the drilling tubular toward the landing ring,
- absorbing a first shock, the first shock caused by a fin of the shock absorber apparatus being brought into contact with the landing ring, the first shock being at least partially absorbed by a first spring of the shock absorber apparatus being compressed;
- absorbing a second shock, the second shock caused when the first spring resiliently expands following the first shock, the second shock being at least partially absorbed by a second spring of the shock absorber apparatus being axially compressed.
Dependencies are inferred from the claim text.