The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 1978
Filed:
Nov. 16, 1976
Malcolm N Council, Richardson, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
A well tubing handling system for running and pulling well tubing including a flange assembly for coupling the system on a wellhead, a central telescoping stabilizer tube assembly mounted on the flange assembly and comprising meshing splined outer lower and concentric upper inner tubes, an upper traveling slip assembly secured on the upper end of the upper inner stabilizer tube for gripping well tubing for raising or lowering the tubing through the stabilizer tube assembly, two sets of diametrically opposed hydraulic cylinder assemblies having piston rods connected with the upper traveling slips for raising and lowering the slips, two sets of lower slips mounted in axial alignment below the stabilizer tube assembly for holding the tubing against upward or downward movement while resetting the upper traveling slips, and a work platform mounted on the upper end of the stabilizer tube assembly for operators and the necessary control panels and the like. The sets of cylinder assemblies are of different sizes to provide maximum operating speeds at selected handling capacities. The stabilizer tube assembly permits maximum extension of the piston and cylinder assemblies with minimum twisting and lateral deflection and, thus, maximum stability. Two optional hydraulic control systems are disclosed to provide a substantial number of snubbing and pulling speeds. A variable volume hydraulic pump operated at maximum discharge volume and pressure is used to drive the cylinder assemblies with the maximum speed of snubbing and pulling at each required capacity being obtained pressurizing selected chambers of selected pairs of cylinder assemblies.