In our previous entries to this multi-part blog series, we went over some of the basics and installation tips for tubing anchors within the oil drilling world. Also sometimes referred to as tubing anchor catchers (TACs), these are vital components for proper pumping efficiency and limiting wear-and-tear on various rods, tubing, casing and pumps.
At Oilfield Equipment & Manufacturing, we’ll be happy to explain all of the ins and outs of our high-quality Baker style tubing anchors to you as needed. These are part of our overall selection of oil rig components, a field in which we’ve been proudly serving a variety of customers for years. In today’s final section of our blog series, we’ll offer you some basics operational tips for TAC systems, some information on release formats, and even some simple ins and outs on tubing stretch.
Here are two important operational tips for those utilizing tubing anchors:
- Right hand turn: Before reaching the desired setting depth, one risk you want to avoid is your slips dulling out. To do this, we recommend putting in a right hand turn in the tubing every five to 10 strands. This involves rotating the tubing to the left with hand wrenches at the desired depth, doing so until the slips contact the casing. Maintain your left-hand torque while either pulling strain or setting down, working the play out of the tool. Apply the required amount of tubing tension based on inches of stretch (not pounds of pull), applying the weight of the tubing before stretching gets started.
- Maximum allowable load: When running a TAC, the maximum allowable load below it must not exceed maximum load valves. To find this number, you combine the weight of the fluid inside the tubing and the tubing weight below the TAC.
Normal vs. Emergency Releasing
During normal operation, a TAC should be released while the tubing is still in moderate compression. This is to allow the lower cone to completely retract when the slips lose their casing grip. If the lower cone is not completely retracted, the slips will drag and dull the teeth over time. Tubing should be rotated to the right so five to eight revolutions can be obtained – this will be enough to retract both cones and allow the slips to properly move int their housing.
For emergency release needs, on the other hand, the amount of up-strain used must be greater than the total shear strength of the shear pins plus the weight of the tubing. Shearing these pins will release the TAC.
Basics on Tubing Stretch
We mentioned tubing stretch earlier in this series, and this refers to keeping direction of length and force changes correct when tubing strings are impacted by mechanical, pressure and various temperature changes. There are various kinds of hand calculations done depending on the axial loads the tubing string is exposed to, and our pros will be happy to detail these for you.
For more on tubing anchors, or to learn about any of our other oil drilling tools or components, speak to the staff at Oilfield Equipment & Manufacturing today.