Oilfield tubular spin-in and spin-out detection for making-up and breaking-out tubular strings
Spin-in and spin-out apparatus and methods are presented wherein an oilfield tubular spinner used in combination with a wrench detects the shouldering-up of tubulars during make-up and tubular thread disengagement during break-out. Sensors are employed to quantify measurables indicative of shouldering-up and thread disengagement, the measurables being used to shutdown spin-in and spin-out operations. Thresholds are employed to detect measurable values of interest. Timers may be employed to monitor and control the spin-in and spin-out operations.
1. A method for making up a threaded connection between an upper tubular and a lower tubular using an oilfield tubular spinner and a torque wrench, the method comprising:
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;
detecting that the threshold hydraulic system pressure is reached; and
operating the motor of the tubular spinner for a period of time at high torque after the threshold hydraulic pressure is reached.
2. The method of claim 1 , wherein monitoring comprises comparing a measured hydraulic system pressure to the threshold hydraulic system pressure.
3. The method of claim 1 , wherein the hydraulic system pressure is monitored to detect a slip condition prior to shouldering-up.
4. The method of claim 3 , 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.
5. 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.
6. The method of claim 1 , which further comprises tightening the tubular connection with the torque wrench after spin-in and shoulder-up.
7. The method of claim 1 , wherein the motor is selected to comprise a hydraulic system driving motor.
8. The method of claim 1 , wherein the torque wrench is selected to comprise tongs and the tubular spinner is selected to comprise a plurality of rollers.
9. The method of claim 8 , wherein the motor comprises a plurality of spin motors associated with the rollers to reduce a load on each of the spin motors.
10. The method of claim 1 , wherein the torque wrench is adapted to grip and rotate the lower tubular and the 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 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.