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Hydraulic set anchor that can be converted to a Scraper, Mill, or Stabilizer

IP.com Disclosure Number: IPCOM000247846D
Publication Date: 2016-Oct-06
Document File: 5 page(s) / 96K

Publishing Venue

The IP.com Prior Art Database

Abstract

An anchor is presented that can be deployed into a well with the slips in the retracted position and then be set and released hydraulically. The hydraulic set anchor can easily be converted to a scraper, stabilizer, or mill. Once at depth drill pipe pressure will set the anchor. The tool includes a check valve that maintains pressure on a chamber that keeps the slips or blades in the expanded position. When the tool is no longer needed pressure is applied to a piston to break shear screws that will allow the piston to move axially. Axial movement of the piston opens an annular port that releases the pressure in the chamber below the slips or blades. The annular port prevents pressure from being retained in the chamber. Springs will then permanently retract the slips or blades. A relief valve has been added that can be used to adjust the amount of force that is applied to the blades.

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Hydraulic set anchor that can be converted to a Scraper, Mill, or Stabilizer
An anchor is presented that can be deployed into a well with the slips in the retracted position and then be set and released hydraulically. The hydraulic set anchor can easily be converted to a scraper, stabilizer, or mill. Once at depth drill pipe pressure will set the anchor. The tool includes a check valve that maintains pressure on a chamber that keeps the slips or blades in the expanded position. When the tool is no longer needed pressure is applied to a piston to break shear screws that will allow the piston to move axially. Axial movement of the piston opens an annular port that releases the pressure in the chamber below the slips or blades. The annular port prevents pressure from being retained in the chamber. Springs will then permanently retract the slips or blades. A relief valve has been added that can be used to adjust the amount of force that is applied to the blades.

An anchor that can be set and released hydraulically. The mechanism used to set and release the anchor could also be used to expand blades on a scraper, stabilizer, or mill. The outward force applied to scraper blades must be limited to prevent damaging the casing when rotating the scraper. Too high of outward force on the scraper blades could create enough friction that the drill pipe would not be able to rotate the scraper. By adding a relief valve to the chamber below the blades the amount of radial force can be controlled by adjusting the pressure required to open the relief valve. Having the blades retracted when tripping in and out of the well will eliminate damage to the casing and increase blade life. The milling assembly for a casing exit in 20.0 in. OD casing must pass through a 17.7 in. ID restriction. This means the milling assembly 17.5 in. OD is significantly undersized compared to the cas...