Boring or penetrating the earth – With orienting or racking means for unconnected tools or...
Patent
1979-06-18
1981-09-22
Purser, Ernest R.
Boring or penetrating the earth
With orienting or racking means for unconnected tools or...
52115, 166 77, 166 775, 173 23, 173 28, 173 57, 173147, 254 93VA, E21B 1500, E21B 1914
Patent
active
042904951
ABSTRACT:
A portable workover rig for handling a pipe string in a well casing includes a base platform and a collapsible mast which is movable from a reclining transport position to an erect elevated position of use. The mast is supported for free-standing operation by a carriage assembly including a cantilever support base mounted on the base platform for pivotal movement from the transport position to the position of use. The carriage assembly includes lift arms coupled in parallel relation intermediate the cantilever support base and the rig support platform for maintaining the cantilever support base in parallel alignment with the base platform. Hoisting and snubbing operations are performed by drawworks including a linear hydraulic actuator carried on the base platform, a traveling block supported for vertical movement along the mast by hoist and snub cables, and traveling sheaves carried by the actuator through a stroke pathway which is oriented transversely with respect to the mast. A vertically adjustable stack assembly is provided for accommodating the varying elevations of existing wellhead flange connections and for anchoring the rig platform to the wellhead casing. A powered drill sub assembly includes upstanding stab receptacles anchored to the top side of the traveling block and stab elements supported for vertical reciprocal movement between retracted and extended positions to permit displacement of the power sub relative to the traveling block during makeup and breakout operations.
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Hydra-Rig, Inc.
Purser Ernest R.
LandOfFree
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