| 摘要 |
Apparatus for stabbing well casing to join casing sections to each other, including a rotary table assembly for supporting a casing section in a well bore, a derrick over the rotary table assembly, a crown block at the top of the derrick, a first piston and cylinder subassembly pivotally mounted on one side of the derrick over the rotary table assembly and below the crown block for pivotation about a horizontal axis, a second piston and cylinder subassembly pivotally mounted on a second side of the derrick for pivotation about a horizontal axis, with said second piston and cylinder subassembly located over the rotary table assembly and below the crown block and extending substantially normal to the direction of extension of the first piston and cylinder subassembly, cooperating casing clamping elements carried on the piston rods of the first and second piston and cylinder subassemblies, and counter balancing subassemblies connected to the first and second piston and cylinder subassemblies for pivoting the first and second piston and cylinder subassemblies to a vertically extending inoperative position.
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