Setting and releasing Slimline™ Tubing Anchor Catcher
-We highly recommend that proper care be taken to prep/clean the casing prior to running in with a Slimline™ (e.g. bit & scraper, string mill, etc.) to ensure tool will actuate properly.
-Drag Springs should not be used as a carrying handle for this tool. Due to the leverage afforded by the springs being fastened at only one end, permanent distortion of the spring and possible serious difficulty in running can result.
-Do not tighten through the Tool when attaching it to the tubing string. When attaching tubing to the Slimline™ put a backup on the subs. This will help prevent over-tightening and possible galling of inner threads of the tool.
-Always confirm Slimline™ placement in relation to the pump and/or any other downhole assembly. The Slimline™ may safely be set below the seat nipple to accommodate pumps/tools larger than the Slimline™ ID.
To prevent slips from setting prematurely, it is advisable to put a right-hand turn in the tubing every 5-10 stands.
At the desired setting depth, rotate the tubing to the left until the slips contact the casing (approximately 6-8 turns for 7” & 5-1/2” TAC’s and 8-12 for 4-1/2” TAC’s at the tool). Whenever possible setting the TAC should be done with pipe wrenches. However, if power tongs are needed please ensure the torque on the tongs is 700-800 lbs less than what the tubing string was initially tightened with. This will help prevent tubing from backing off. The tubing will torque up when the slips have set. To ensure all tubing torque works its way down to the tool, maintain left-hand torque and alternate several times between setting down and pulling up roughly 5,000 lbs. Set back to neutral, torque again and then the tubing is ready to be landed.
NOTE: As not all weight indicators are accurate, tubing tension should always be calculated in inches of stretch rather than pounds of pull to ensure accurate tension is applied.
Normal Releasing Procedure
The Anchor Catcher should be released with the tubing in slight compression as the upper cone contacts slips, so that the lower cone will be completely retracted when the slips lose their grip on the casing. This feature prevents dulling of the slips due to incomplete retraction of the lower cone during retrieving. However, if this is not possible the tool can be released without compression or even with the tubing string in tension. Rotate the tubing to the right (5 to 8 turns at the tool) to retract the cones form the slips and allow the slips to move back into the housing. To ensure a complete release reciprocate the tubing string a few feet while rotating a few more turns to the right before starting out of the hole. It is good practice to take an occasional right-hand turn while coming out to ensure against dulling the slips.
If it is impossible to release the Tubing Anchor Catcher in the above manner, an up-strain greater than the total shear strength of the shear pins plus the weight of the tubing will shear the pins and release tool.
Length: = pull force in thousands x length feet in thousands x Stretch constant, in inches of stretch per thousand pounds of pull per thousand feet of length.
(Example) Determine the amount of stretch for 30,000 lbs of pull on 6,500 ft of 2.375 OD, 4.7#,1.995 ID tubing.
30 x 6.5 x 0.30675 (stretch constant for 4.7# 2.375 tubing)
=59.8 inches of stretch
*Stretch constant for 6.5# 2.875 tubing is .22075