Oilfield tubular spin-in and spin-out detection for making-up and breaking-out tubular strings
Methods for making a threaded connection between an upper tubular and a lower tubular using an oilfield tubular spinner and a torque wrench, including holding the lower tubular with the torque wrench, frictionally engaging the upper tubular with the tubular spinner, operating a motor of the tubular spinner to spin-in and shoulder-up a tubular connection between the upper tubular and the lower tubular, establishing a threshold hydraulic system pressure that indicates a shouldered-up condition, monitoring, with a detection system, a hydraulic system pressure of the motor during spin-in and shoulder-up, and maintaining the threshold hydraulic system pressure to operate the motor for a selected period of time after the threshold hydraulic system pressure is reached. An oilfield tubular spinner for an oilfield tubular wrench is also provided.
1. A method for making up a threaded connection between an upper tubular and a lower tubular using a low-torque oilfield tubular spinner and a high-torque torque wrench, the low-torque and high-torque being relative to each other, the method comprising:
holding the lower tubular with the high-torque torque wrench;
frictionally engaging the upper tubular with the low-torque tubular spinner;
operating a motor of the low-torque tubular spinner to spin-in and shoulder-up a tubular connection between the upper tubular and the lower tubular;
establishing a threshold hydraulic system pressure that indicates a shouldered-up condition, wherein the threshold hydraulic system pressure is substantially equal to a maximum hydraulic system pressure;
monitoring, with a detection system, a hydraulic system pressure of the motor during spin-in and shoulder-up;
detecting the shouldered-up condition, with the detection system, when the maximum hydraulic system pressure is substantially reached; and
maintaining the threshold hydraulic system pressure to operate the motor for a selected period of time when the threshold hydraulic system pressure is reached.
2. The method of claim 1 , wherein the motor comprises a hydraulic system driving motor.
3. The method of claim 2 , wherein monitoring comprises comparing a measured hydraulic system pressure to the threshold hydraulic system pressure.
4. The method of claim 2 , wherein the hydraulic system pressure is monitored to detect a slip condition prior to shouldering-up.
5. The method of claim 4 , which further comprises shutting down the motor after the detection system determines that a hydraulic system pressure below the threshold hydraulic system pressure has been maintained for a selected period of time, indicating that a slip condition has occurred.
6. The method of claim 2 , wherein the motor comprises a plurality of spin motors associated with the rollers to reduce a load on each of the spin motors.
7. The method of claim 1 , which further comprises monitoring a period of time for operation of the motor suitable for substantially establishing a shouldered-up condition.
8. The method of claim 1 , which further comprises tightening the tubular connection with the high-torque torque wrench after spin-in and shoulder-up.
9. The method of claim 1 , wherein the high-torque torque wrench is selected to comprise tongs and the low-torque tubular spinner is selected to comprise a plurality of rollers.
10. The method of claim 1 , wherein the high-torque torque wrench is adapted to grip and rotate the lower tubular and the low-torque tubular spinner is selected to frictionally engage and rotate the upper tubular.
11. The method of claim 1 , wherein the hydraulic system pressure jumps to an initial operating pressure when the low-torque tubular spinner is engaged, and then gradually increases as the upper and lower tubulars are threaded together.
12. The method of claim 1 , wherein the threshold hydraulic system pressure comprises a plateau in the hydraulic system pressure.