Modular drill rig erection systems
AssigneeChloride Group Limited
InventorsDavid F. Cox, Tom T. Hashimoto
Life of this patent
Estimating the term…
Abstract
A system for erecting elevated floors where a first support floor with a drawworks thereon is connected to one end of a base structure by two pair of parallel spaced pivotable links and a second support floor is coupled to the opposite end of the base structure and by two pair of parallel spaced pivotable links. In accordance with the invention a strong back is erected about midway of the length of the base forming a rigid frame and supporting elevated sheaves at each side of the base structure. A pair of cables are adapted to pass over said sheaves, one on each side of said base structure and connect first to said first floor for erection and then to said second floor for erection.
Claims6
In a drilling rig having a base for placement on the ground at a well site with a supporting floor structure releasably connected to the base and supported on parallel spaced legs on each side of said base pivotally attached between the supporting floor structure and the base whereby the supporting floor structure is movable from the base to an elevated position above thhe base upon rotation of the legs to a vertical position, perpendicular to the base, the improvement comprising:
- a pair of strong back towers, one mounted on each side of the base near midway the length thereof;
- sheave means supported on the top of each of said strong back towers with the axes thereof transverse to the length of the base;
- sheave means mounted on said supporting floor structure;
- cable means releasably connected to and passing successively said sheave means on said floor structure and over said sheave means supported on said strong back towers;
- and
- hydraulic linkage means coupled to said cable means for exerting a force through said cable means for raising the supporting floor structure to the elevated position above the base and adjacent said strong back towers.
In a drilling rig having a base for placement on the ground at a well site with a supporting floor structure releasably connected to the base and supported on parallel spaced legs on each side of said base pivotally attached between the supporting floor structure and the base whereby the supporting floor structure is movable from the base to an elevated position above the base upon rotation of the legs to a vertical position, perpendicular to the base, the improvement comprising:
- a pair of strong back towers, one mounted on each side of the base near midway the length thereof;
- and
- means including hydraulic linkage means on each side of the base and mounted to pivot on the base and to be extensible in planes parallel to the parallel spaced legs and coupled between the base and the supporting floor structure for exerting a force for raising the supporting floor structure to the elevated position above the base and adjacent said strong back towers.
Dependencies are inferred from the claim text.