Releasing and circulating overshot is special external fishing tool used for fishing drill collar,dill pipe,tubing and other fished in drilling and work over operation.according to different uses,it may be equipped with some accessories,such as extension sub,wall hook,oversize guide,etc.
Releasing and Reversing Overshot
Releasing and reversing overshot ,a new type of fishing tool, has many advantages owned by various overshot, box tap and the like. Its distinguishing features are as follows: to unscrew and recover the stuck fish: to release the fish down hole if necessary; to circulate the washing fluid.
Releasing Spears
In Drilling and work over operation, LH type releasing spear is a tool mainly used for fishing of drill pipe, oil pipe and casing from fish hole. It can be used with internal cutter, bumper jar etc.
Reversing Sub
Reversing sub is also called reversing spear which is a special tool for reversing stuck drill stem above stuck point in drilling and work over operation. When make fishing or reversing, if fallen object is stuck or fail to be released, the tool can released from thread connection of reversing sub to take out fishing tool.
Taper Tap
Taper tap is a special tool cutting thread and fishing internally in dropped objects such as tubing, drill-pipe, wash-over pipe, packer, water flow allocator, down-hole production allocator . The tool is especially a great success in catch of objects accompanied with couplings. The taper tap can effect different fishing operating when equipped with RH thread or LH thread drill pipes and other tools.
Die Collar
Die collar is a special external fishing tool which is engaged on the outside wall of tubing objects such as oil tubing and drill pipe.It can be used in fishing cylindrical objects without inner bore or stucked inner bore.
Internal Hook
The internal hook is used inside casing or tubing to catch all kinds of ropes and other fishes such as wire-lines, cables, logging steel pieces, paraffin cutters, etc. Internal hooks are available in two types: Live(adjustable)internal hook and Dead(fixed)internal hook.
External Hook
The external hook is used inside casings or tubings to catch all kinds of ropes, lifting bails, hollow short cylinders, short rope slings such as wirelines, logging steel pieces, cables, etc.
Junk Sub
During drilling process, LH type junk sub is applied mainly for fishing of shivers and fallen objects such as carbide tooth, drill bit and bearing which can not be carried out of hole by conventional fluid circulation, etc. It possesses important functions to keep hole cleaning, increase bit services life, reduce and prevent drill bit from unexpected damage. The tools are available with all sizes and super performance.
Milling Shoe
Milling shoes are bead welded YD alloy or other abrasive material on the bottom to mill downhole fallen objects.(common type and high-efficient type)
Impression Block
The impression block is an assembly of a steel body and a soft lead founded at the bottom. It is used to know the accurate depth, shape of fishing and check the deformation shape of casing diameter.
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