Hydraulic drill string breakdown and bleed off unit

Details Hydraulic drill string breakdown and bleed off unit Hydraulic drill string breakdown and bleed off unit

1984-10-04

1987-02-17

Levy, Stuart S.

Wells

Above ground apparatus

With means facilitating connecting or disconnecting...

166 78, 166 85, 81 5716, 81 5734, 173164, E21B 1916, B25B 1700

Patent

active

046432590

ABSTRACT:
A combination tool for breakdown of oilwell drill strings which may contain obstructions, corrosive fluids, and trapped, high-pressure gases is disclosed. The tool provides an upper rotary hydraulic power wrench or tong, an intermediate, hydraulically operated pressure chamber for enclosing the drill string joint during the breakdown process, and a lower backup tong for securing a section of the drill string against the rotary effort of the upper tong. The combination is mounted on a drill platform to be rolled from a position free of the drill string and rotary table to a position over the rotary table encompassing a joint in the drill string to be broken down. Chicksan lines connect the pressure chamber of the tool to a support base permitting the controlled bleedoff of trapped pressure. Two supplementary high-pressure lines connected by chicksan lines to a backup structure permit controlled bleeding off of drilling fluids trapped in a section of drill string and permit fluid flow to wash away entrapped particulates released when the drill string is broken down. The pressure chamber contains a set of anti-kick jaws to prevent the ejection of the removed drill string section in the event of sudden release of trapped gas. A set of gears and splines coordinate the rotation of the anti-kick jaws and the power tong jaws, and maintain power tong jaws at a right angle with respect to the upper drill string segment during vertical motion of the drill string.

REFERENCES:
patent: 4162704 (1979-07-01), Gunther

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