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Selective Flow Method for Multi-String Cutters

IP.com Disclosure Number: IPCOM000240345D
Publication Date: 2015-Jan-23
Document File: 7 page(s) / 286K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention is a series of modifications to current the existing multi-string cutter tool. The initial demand for the invention stems from customers asking for a method to drill out an aluminum plug then up-ream a section of expandable liner in a single run. Initially the method involved "dry milling" (without circulation) the aluminum plug to prevent the multi-string cutter tool, attached to the BHA above, from extending its knives and damaging the installed liner. The string would then be lowered and flow established to open the multi-string cutter tool knives and up-ream the exposed liner bottom. This invention involves creating a new "Indicator" that is extended inside the ID of the multi-string cutter tool with shear screw holes tapped around the circumference of the newly extended portion. A matching set of holes is tapped on the existing piston, which allows the two to be pinned together and shouldered in the closed position. The flow rate range to shear the pins and release the piston to extend the knives can be adjusted by; adding or removing shear screws from the 6 possible holes or changing the nozzle size in the indicator to increase or decrease pressure drop acting as the shear force. This effectively gives the ability to have a selectively activated hydraulic cutting tool. If the invention succeeds in testing and will be the only company who can currently circulate while milling the lower plug and up-ream the unexpanded portion of an expandable casing/liner system in a single run. The indicator is extended into the smaller bore of the multi-string cutter tool with 6 shear screw holes tapped into the sides. It matches with the holes bored into the modified piston and pins the two together with the indicator shouldered out on the internal upset in the multi-string cutter tool body. The piston is unable to transition downwards when backpressure from the nozzle inside the nozzle carrier is applied to the packing on the piston. This allows circulation in the wellbore without the risk of damaging the casing by extending the knives on the multi-string cutter tool. Once ready to open the knives, flow rate is increased to the predetermined shear range, adjusted by the number of shear screws and nozzle size in the carrier. This shears screws holding the piston in place and allows for normal function of the tool.

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Selective Flow Method for Multi-String Cutters

This invention is a series of modifications to current the existing multi-string cutter tool. The initial demand for the invention stems from customers asking for a method to drill out an aluminum plug then up-ream a section of expandable liner in a single run. Initially the method involved "dry milling" (without circulation) the aluminum plug to prevent the multi-string cutter tool, attached to the BHA above, from extending its knives and damaging the installed liner. The string would then be lowered and flow established to open the multi-string cutter tool knives and up-ream the exposed liner bottom. This invention involves creating a new "Indicator" that is extended inside the ID of the multi-string cutter tool with shear screw holes tapped around the circumference of the newly extended portion. A matching set of holes is tapped on the existing piston, which allows the two to be pinned together and shouldered in the closed position. The flow rate range to shear the pins and release the piston to extend the knives can be adjusted by; adding or removing shear screws from the 6 possible holes or changing the nozzle size in the indicator to increase or decrease pressure drop acting as the shear force. This effectively gives the ability to have a selectively activated hydraulic cutting tool. If the invention succeeds in testing and will be the only company who can currently circulate while milling the lower plug and up-ream the un...