Control system for drawworks operations
First Claim
1. A method for monitoring and controlling a drawworks including a rotatable drum on which a line is wound, wherein the drawworks and the line are used for facilitating movement of a load suspended on the line, the method comprising:
- connecting a brake arrangement to the rotatable drum for limiting the rotation of the rotatable drum;
connecting at least one electrical motor to the rotatable drum for driving the rotatable drum;
producing a load signal representative of the load suspended on the line;
producing a calculated torque value based on the load signal and electrical motor capacity;
generating pre-torquing of the electrical motor based on the calculated torque value; and
transferring control of the rotation of the rotatable drum from the brake arrangement to the electrical motor.
1 Assignment
0 Petitions
Accused Products
Abstract
The system and method for use with a drawworks having a rotatable drum on which a line is wound, wherein the drawworks and the line are used for facilitating movement of a load suspended on the line, includes a drawworks control system for monitoring and controlling the drawworks. A brake arrangement is connected to the rotatable drum for limiting the rotation of the rotatable drum and at least one electrical motor is connected to the rotatable drum for driving the rotatable drum. A load signal representative of the load on the line is produced and a calculated torque value based on the load signal and electrical motor capacity is provided. The drawworks control system provides a signal representative of the calculated torque value to the electrical motor wherein pre-torquing is generated in the electrical motor in response to the signal. Control of the rotation of the rotatable drum is transferred from the brake arrangement to the electrical motor when the electrical motor pre-torquing level is substantially equal to the calculated torque value.
123 Citations
25 Claims
-
1. A method for monitoring and controlling a drawworks including a rotatable drum on which a line is wound, wherein the drawworks and the line are used for facilitating movement of a load suspended on the line, the method comprising:
-
connecting a brake arrangement to the rotatable drum for limiting the rotation of the rotatable drum; connecting at least one electrical motor to the rotatable drum for driving the rotatable drum; producing a load signal representative of the load suspended on the line; producing a calculated torque value based on the load signal and electrical motor capacity; generating pre-torquing of the electrical motor based on the calculated torque value; and transferring control of the rotation of the rotatable drum from the brake arrangement to the electrical motor. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method for monitoring and controlling a drawworks including a rotatable drum on which a line is wound, wherein the drawworks and the line are used for facilitating movement of a load suspended on the line, the method comprising:
-
connecting a brake arrangement to the rotatable drum for limiting the rotation of the rotatable drum; connecting at least one electrical motor to the rotatable drum for driving the rotatable drum; producing a load signal representative of the load suspended on the line; producing a calculated torque value based on the load signal and electrical motor capacity; and generating pre-torquing of the electrical motor; and commencing a gradual release of the brake arrangement from the rotatable drum; wherein, unless the rotation of the rotatable drum is in a lowering direction, transferring control of the rotation of the rotatable drum to the electrical motor while fully releasing the brake arrangement from the rotatable drum when the electrical motor pre-torquing level is substantially equal to the calculated torque value; and wherein, when the rotation of the rotatable drum is in a lowering direction, engaging the brake arrangement to limit rotation of the rotatable drum and increasing the calculated torque value; wherein, when the rotation of the rotatable drum is no longer in a lowering direction, transferring control of the rotation of the rotatable drum to the electrical motor while fully releasing the brake arrangement from the rotatable drum when the electrical motor pre-torquing level is substantially equal to the increased calculated torque value. - View Dependent Claims (8, 9, 10)
-
-
11. A system for monitoring and controlling a drawworks including a rotatable drum on which a line is wound, wherein the drawworks and the line are used for facilitating movement of a load suspended on the line, the system comprising:
-
a brake arrangement connected to the rotatable drum for limiting the rotation of the rotatable drum; at least one electrical motor connected to the rotatable drum for driving the rotatable drum; a load signal representative of the load on the line; a calculated torque value based on the load signal and electrical motor capacity; a drawworks control system for providing a signal representative of the calculated torque value to the electrical motor wherein pre-torquing is generated in the electrical motor in response to said signal; and wherein control of the rotatable drum is transferred from the brake arrangement to the electrical motor. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A drilling rig comprising:
-
a derrick; a traveling block, suspended from the derrick by a line connected to an anchor, for facilitating upward and downward movement of associated equipment into and out of a well bore; a drawworks including a rotatable drum on which the line is wound; at least one electrical motor connected to the rotatable drum for driving the rotatable drum; a brake arrangement for limiting rotation of the rotatable drum; a measuring device for producing a load signal representative of the load on the traveling block; and a drawworks control system for providing a calculated torque value based on the load signal and electrical motor capacity and for providing a signal representative of the calculated torque value to the electrical motor wherein pre-torquing is generated in the electrical motor in response to said signal; wherein control of the rotatable drum is transferred from the brake arrangement to the electrical motor; the drawworks control system provides a disabling signal to the brake arrangement and a control signal to the electrical motor to transfer control of the rotatable drum when the electrical motor pre-torquing level is substantially equal to the calculated torque value. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
-
Specification