Hydraulic Casing Spear
DESCRIPTION/APPLICATION The Hydraulic Casing Spear is designed to be run above a mechanical or hydraulic inside casing cut- ter and used to retrieve casing sizes from 9-5/8” to 13-3/8”. This application allows for the cutting and pulling of the casing string to be accomplished in one trip. The spear can be rotated inside the casing string without engaging. Once the cut0 is completed the spear can then be positioned at the desired location inside the casing string. The rugged design of the spear makes it well suited to withstand the most se- vere downhole environments for retrieval of casing
related groups :
tags :
description
OPERATION
Dress spear to the correct size casing to be engaged. It is recommended to run the hydraulic spear one joint above the cutter you are using. This will prevent hav- ing to strip out of the casing at surface to lay down cutter and accessories. Once cut has been made, pickup to position the spear at the top of casing string. Drop restriction plug in drillpipe. Allow one minute per 1,000 ft for restriction plug to seat in spear. Pressure up slowly to the necessary pressure drop (minimum of 500 psi) to set spear. Once the Hydraulic Spear is set pickup and pull on casing. Pullout of hole slowly. Set the joint of pipe on top of the Hydraulic Spear in rotary and drop shear release ball in pipe. Pick up kelly or top drive and screw into same. Pick up and set casing in slips and secure. Pressure up on spear to the necessary shear load. Once shear screws are sheared spear is released and can now be laid down.
FEATURES/BENEFITS
- Allows for cutting and retrieval in one trip
- Simple construction permits ease of operation and maintenance
- Bore through ID of tool permits circulation to casing cutter
- Slips are retracted inside of body to prevent damage to tool or casing when casing is being cut downhole
- Easily dressed for alternate casing sizes
- Set and released hydraulically. No mechanical
- intervention required