Optimized machining process for cutting tubulars downhole
AssigneeBaker Hughes Incorporated
InventorsKarsten Fuhst, Sven Krueger
Life of this patent
Estimating the term…
Abstract
The tubular cutting tool for severing downhole tubulars, the tool having a drive system, a pivoting system, a cutting head, a cutting member, and a lubricant delivery system. Cutting may be accomplished by rotatingly actuating the cutting head with an associated motor and extending the cutting member away from the cutting head. The lubricant delivery system lubricates the respective contacting surfaces of the cutting member and the tubular and is actuated when the cutting member extends from the cutting head.
Claims22
A cutting tool for cutting a downhole tubular, the cutting tool comprising:
- a housing;
- a cutting member having a stowed position within the housing and a cutting position in cutting contact with the tubular;
- lubricant stored in a reservoir in the housing;
- a lubricant dispensing system having an inlet in fluid communication with the reservoir;
- an exit on the lubricant dispensing system that is sealed when the cutting member is in the stowed position, and opened by moving the cutting member into the cutting position, so that when the cutting member is in the cutting position lubricant can flow from the reservoir, through the lubricant dispensing system, and from the exit into the space between the cutting member and the downhole tubular;
- and
- a conveyance member suspended from the surface and comprising a lower end attached to the housing, a motor in the housing coupled to the cutting member, and an anchor coupled with the housing, and selectively positioned in a deployed configuration in anchoring contact with the tubular.
A method of cutting a downhole tubular comprising:
- a) providing a tubular cutting device that includes a body, a cutting member moveable along a path from a stowed position within the body to a cutting position outside of the body, a supply of lubricant in the body, a lubricant dispensing system in fluid communication with the lubricant and comprising a selectively openable exit that is in sealing contact with a portion of the cutting member when the cutting member is in the stowed position and is open when the cutting member is in the cutting position;
- b) deploying the cutting device within the tubular;
- c) contacting the portion of the dispensing system with the cutting member by moving the cutting member from the stowed position to the cutting position;
- d) selectively opening the dispensing system exit by the step of moving the cutting member from the stowed position to the cutting position so that lubricant flows from the exit and in the space adjacent the portion of the tubular to be cut;
- e) rotating the cutting member;
- f) contacting the tubular with the rotating cutting member with the lubricant between the cutting member and the tubular;
- and
- g) moving the cutting member from the stowed to the cutting position thereby opening the dispensing system exit and urging lubricant through the dispensing system and out the exit so that the lubricant flows between the cutting member and the tubular.
A cutting tool for cutting a tubular comprising:
- a housing;
- a motor in the housing;
- a supply of lubricant in the housing;
- a cutting blade rotatable by the motor and extendable from within the housing into cutting contact with the tubular inner surface;
- and
- a means for conveying the lubricant from within the housing to the tubular inner surface where it is contacted by the cutting member that is operable when the cutting member extends into cutting contact with the tubular inner surface.
Dependencies are inferred from the claim text.