Patent Number: 8,875,365

Title: Tongs with low torque at high pressure

Abstract: A tongs system and method for making and breaking threaded joints of a string of tubing for an oil well involves, in some examples, the use of a set of tongs with a two-speed transmission and a hydraulic system selectively operable in a high-pressure mode and a low-pressure mode. During an initial tightening period, the tongs system operates in high-gear and high-pressure for maximum speed. During a subsequent final tightening period, the tongs system operates in low-gear and low-pressure to controllably tighten the joint to a predetermined target torque. In some examples, to allow the transmission to shift speed without jamming gears, the tongs system pauses for an instant between the initial and final tightening periods. In some examples, the tongs system is interlocked with a hoist and/or other tube-holding and handling equipment.

Inventors: Huseman; Jonathan V. (Midland, TX), Robnett; Kasia L. (Midland, TX), Newman; Frederic M. (Midland, TX)

Assignee:

International Classification: B23P 19/04 (20060101); B21D 39/04 (20060101); B23Q 17/00 (20060101); B23P 19/00 (20060101); B23Q 7/00 (20060101); B25B 23/151 (20060101); B25B 23/00 (20060101); B25B 13/50 (20060101)

Expiration Date: 2019-11-04 0:00:00