Tesco Top Drive Equipment Life Cycel Manual - English (Book).pmd

The amount of loop pressure needed to hold thedrillstring when the grabber is opened will change asdepth, and angle of build increase. This is why youshould record a downhole torque history, because thex value will be easier to predict.Turn the string to the left by decreasing loop pressure(‘decrease pumps’), and, if there is not much reactivetorque present, select ‘reverse’ until positioning iscomplete, then close the grabber.Note: The maximum reverse torque is set to preventthe string unscrewing. Do not engage the ‘breakout’function or the drillstring could come apart.Tripping:The Tesco top drive reduces the amount of time andwork involved in tripping and reaming by giving you theability to thread into the drillstring at any point in thederrick. This is useful when encountering hole problemswhile tripping (for instance, pulling tight, bridging off orwhen a kick is evident). In short, any time when theneed to pump fluid into the well exists, it can be donewithout having to position the drillstring at floor level inorder to install the kelly.Tripping pipe with a top drive is similar to conventionalmethods, with the exception that the robotic functionsease pipe-handling procedures. At no time is itnecessary for the rig crew to position the elevators oropen and close them. The link tilt function can pushthe stand of pipe to be racked to the worker, both onthe rig floor and to the derrickhand. When running inthe hole, the derrickhand does not need to lean out tothrow the stand in the elevators; he can simply easethe stand into the elevators, which are extended towardhim. Once the stand is placed in the elevators, theycan be closed hydraulically. After the stand is racked inthe derrick or added to the string the links should bereturned to the vertical hanging position by selectingthe ‘float’ function.Important – The links and elevators should neverbe manually operated by a worker.Cold Climate:When the hydraulic top drive is working in a freezingenvironment, the oil quickly becomes thick and this willreduce its effectiveness. While drilling, the heat fromthe top drive motor(s) warms the oil enough so that thisis not a concern, but whenever the quill is not rotating,such as when you are slide drilling or tripping, the coldclimate function should be used. To activate coldclimate follow these steps:1. Push in the cold climate button (on the left side ofthe drillers panel).2. Select engine speed ‘slow’.3. ‘Drill’ mode.4. ‘Forward’ pumps.5. ‘Increase or decrease’ pumps, to maintain 700psion the hydraulic pressure gauge.When the cold climate button is pushed in it deenergizesthe circuit to the top drive speed control valveand allows the flow of loop oil to pass through the motormanifold and circulates the closed loop system withoutturning the quill.Selecting engine speed slow brings the prime mover toidle speed for cold climate operation. This saves overallwear and tear on the engine when it has a low load onit.Drill mode allows you to control the hydraulic pumpsinternal swash plates, which command the amount ofoil flow to maintain 700psi.Forward pumps directs the oil flow in such a way that itpasses through the maximum amount of filtration beforegoing through the pumps again.Follow these steps in order to properly disengage thecold climate function:1. ‘Neutral’ pumps.2. ‘Connection’ mode.3. ‘Neutral’ engine speed.4. Pull out the cold climate button.By selecting neutral pumps, the flow of hydraulic oil isstopped.Important: Never push out the cold climate buttonwithout the preceding 3 steps.Connection mode keeps the prime mover at an idlewhen the engine speed is switched to neutral.After pulling out the cold climate button the top drivecan now return to normal operation.Page 14 Top Drive Rig Floor Safety Orientation Doghouse Manual