초록 ▼

A new tool has been developed for, in one aspect, facilitating release of a tubular string coupled between a travelling block and elevators with insufficient clearance to release elevator slips in order to remove the tubular. In one aspect the releasing tool is effectively shortened permitting relea

A new tool has been developed for, in one aspect, facilitating release of a tubular string coupled between a travelling block and elevators with insufficient clearance to release elevator slips in order to remove the tubular. In one aspect the releasing tool is effectively shortened permitting release of the elevators. Such shortening is effected by releasing an expansion sub and piston within the tool for relative movement with respect to other parts of the tool. Initially the expansion sub and piston are held in place by fluid in a first chamber. Movement of fluid from the first chamber and movement of fluid into a second chamber housing the piston results in piston movement (and movement of the expansion sub which is secured to the piston) to effectively shorten the tool. In one aspect the fluid moves in a closed loop between the chambers and no fluid is expelled to the environment. In another aspect only one fluid chamber is used.

대표청구항 ▼

A selectively length adjustable tool for use with a rig system for running a string of tubulars including a circulating head, the tool comprising a body with a first end, a second end, and a body fluid flow bore therethrough from the first end to the second end, the body having a first fluid chamber

A selectively length adjustable tool for use with a rig system for running a string of tubulars including a circulating head, the tool comprising a body with a first end, a second end, and a body fluid flow bore therethrough from the first end to the second end, the body having a first fluid chamber and a second fluid chamber, a piston member with a first piston end and a second piston end, the second piston end initially projecting out from and extending from the second end of the body an initial distance, a first piston portion at the first piston end and a second portion at the second piston end, the second portion interconnected to the second portion by a middle member, a piston flow bore extending from the first piston end, through the middle member, to the second piston end for wellbore fluid flow through the tool, the first piston portion movably disposed in the first fluid chamber and the second portion movably disposed in the second fluid chamber, so that expulsion of fluid from the second fluid chamber and introduction of fluid into the first fluid chamber effects movement of the piston member with respect to the body moving the first piston end in the first fluid chamber toward the first end of the body and moving a portion of the second piston end into the second end of the body thereby effectively shortening the length of the tool.