When the new drill rod enters the well, it is recommended to loosen the joint at the wellhead twice, with the torque slightly below the specified value.After confirming that the joint thread and sealing surface are intact, apply enough uniform threaded oil, tighten the joint thread according to the specified torque, and use in the well.This run-in button operation helps strengthening the thread.The surface hardness of the oil drilling rod can improve the card resistance of the threads and extend the service life of the drilling rod.
When the wellhead connects the drill shaft, manual neutralization tapping must be performed to prevent damage to the end surface or thread of the mother joint.Then, buttons were then manually identified with a chain clamp and no less than two buttons were introduced before using the hydraulic power clamp.Tighten the thread of the drill rod joint according to the specified torque (the water holes of different steel types, specifications and sizes require different tightening torque, and must be treated seriously differently).
Before each starting drilling, the drill column should be turned up and down, so that each pair of joints can be screwed once in three starting drilling processes, so as to check the threads of each joint in time and reduce the problems of card drilling, starting drilling and drill leakage.Meanwhile, it shall be moved into the drill rig regularly.Change the force state of the drilling rig to make the force state of all parts of the whole drilling rig become consistent, so as to extend the service life of the drilling rig and reduce the early failure accidents of the drilling rig.During drilling, reasonable speed and drill weight shall be selected according to the formation, bore diameter and BHA structure.To ensure that the drilling rig is in an ideal working state and obtain satisfactory drilling efficiency.When the drill rod speed reaches the critical speed, the rotation of the drill rod produces longitudinal, transverse and torsional vibration.
When it coincides with the inherent frequency of the drill rod itself, it causes resonance, leaving the whole drill column in a serious unstable state to withstand additional fatigue stress to accelerate the fatigue failure of the rig; the larger the WOB, the greater the resistance of the bottom drill.WOB when over critical permeability is easily jammed.When squeezed, the drill rig will bend, causing thread deviation and fatigue fracture.When the drilling rods operate in a corrosive environment, a deoxide and a corrosion inhibitor can be added to the drilling fluid.
Increase the acidity of drilling fluid above 10; select sulfur resistant drilling rod; use drilling rod with inner coating; select low grade drilling rod measures as far as possible while meeting strength requirements to reduce the impact of corrosion factors on drilling tools.The low speed gear shall be used when removing the wellhead and the hook spring shall maintain some tension to ensure no pressure between the threaded surfaces of the two joints.After the joint thread is completely removed, lift the hook again to prevent the thread from receiving force and prevent the upper drill rod from collision with the wellhead master joint under the spring force.
Post time: Nov-15-2021