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. An oilfield tubular spinner for an oilfield tubular wrench, the oilfield tubular spinner comprising:
a powered spin roller including an axis of rotation;
a spin motor operatively connected to, and configured to drive, the powered spin roller to rotate about its axis of rotation; and
a spin-out detection system configured to detect a spun-out condition of an upper tubular being driven by the powered spin roller to threadedly disconnect from a lower tubular and to initiate spin motor shutdown in response to the detection of the spun-out condition, wherein the spin-out detection system includes:
a sensor to identify a downward vertical displacement of the upper tubular during handling by the spinner, such downward vertical displacement indicative of a thread jump, wherein the sensor is selected from the group consisting of: an accelerometer or a linear transducer;
a timer to monitor the operational time that the powered spin roller is driven by the motor;
an encoder to at least indirectly count the number of rotations through which the upper tubular has moved during operation of the spin motor;
a memory storage configured to store spin-out or disengagement times, or both, for particular tubular type profiles to be handled; and
a controller configured to continuously monitor the linear displacement between the upper and lower tubulars, acceleration of the tubulars, or both.
2. The oilfield tubular spinner of claim 1 , wherein the controller issues an alert when there is a thread jump.
3. The oilfield tubular spinner of claim 1 , wherein the controller further continuously monitors the angular displacement of the upper and lower tubulars.
4. The oilfield tubular spinner of claim 1 , further comprising tongs operationally associated with the spinner, wherein the tongs are configured to rotate a tubular at low speed and high torque to begin an unthreading operation.
5. The oilfield tubular spinner of claim 1 , wherein the powered spin roller is configured to accommodate a plurality of oilfield tubulars collectively having a range of diameters.