Abstract: A method for building a dual-member drill string comprising an inner drill string and an outer drill string. Inner pipe sections are connected using non-threaded connections, while outer pipe sections are connected using threaded connections. A new inner pipe section is rotated in a first direction until the inner pipe section applies torque to the existing inner pipe string. If the magnitude of the torque applied to the inner pipe string exceeds a pre-determined threshold value, the inner pipe section is automatically rotated in an opposite second direction. The inner pipe section rotates between opposite directions, once torque is sensed in each direction, until the inner pipe section is coupled to the inner pipe string.

Abstract: A method for building a dual-member drill string comprising an inner drill string and an outer drill string. Inner pipe sections are connected using non-threaded connections, while outer pipe sections are connected using threaded connections. A new inner pipe section is rotated in a first direction until the inner pipe section applies torque to the existing inner pipe string. If the magnitude of the torque applied to the inner pipe string exceeds a pre-determined threshold value, the inner pipe section is automatically rotated in an opposite second direction. The inner pipe section rotates between opposite directions, once torque is sensed in each direction, until the inner pipe section is coupled to the inner pipe string.

Abstract: A method for building a dual-member drill string comprising an inner drill string and an outer drill string. Inner pipe sections are connected using non-threaded connections, while outer pipe sections are connected using threaded connections. A new inner pipe section is rotated in a first direction until the inner pipe section applies torque to the existing inner pipe string. If the magnitude of the torque applied to the inner pipe string exceeds a pre-determined threshold value, the inner pipe section is automatically rotated in an opposite second direction. The inner pipe section rotates between opposite directions, once torque is sensed in each direction, until the inner pipe section is coupled to the inner pipe string.

Abstract: A method for building a dual-member drill string comprising an inner drill string and an outer drill string. Inner pipe sections are connected using non-threaded connections, while outer pipe sections are connected using threaded connections. A new inner pipe section is rotated in a first direction until the inner pipe section applies torque to the existing inner pipe string. If the magnitude of the torque applied to the inner pipe string exceeds a pre-determined threshold value, the inner pipe section is automatically rotated in an opposite second direction. The inner pipe section rotates between opposite directions, once torque is sensed in each direction, until the inner pipe section is coupled to the inner pipe string.

Abstract: In one aspect of the invention a drywell includes a heated receiver for receiving a temperature probe. The receiver has upper and lower ends and an inner shield positioned around the receiver to define a first air channel extending between the upper and lower ends. A flow plate is positioned above the upper end of the receiver and extends outwardly from the receiver. The flow plate defines a plate opening positioned over the receiver opening and has a lower surface sloping away from the receiver with distance above the receiver. A blower positioned below the lower end of the receiver induces air flow through the air channel. The lower surface of the flow plate directs the air flow away from the temperature probe.

Abstract: In one aspect of the invention a drywell includes a heated receiver for receiving a temperature probe. The receiver has upper and lower ends and an inner shield positioned around the receiver to define a first air channel extending between the upper and lower ends. A flow plate is positioned above the upper end of the receiver and extends outwardly from the receiver. The flow plate defines a plate opening positioned over the receiver opening and has a lower surface sloping away from the receiver with distance above the receiver. A blower positioned below the lower end of the receiver induces air flow through the air channel. The lower surface of the flow plate directs the air flow away from the temperature probe.