In Drilling and word over operation, Roschen 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.

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2020年07月08日

for fishing drill rods, oil pipes, casings

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Hydraulic Internal Cutter


Releasing Spear. 


Designed and manufactured according to API spec 7-1. It is pulled from the inside diameter of the fallen fish. It can be used with internal cutter, jar and other tools. If the fish can’t be picked up, pick up the spear.


Standard releasing spears provide a positive means to engage and retrieve an internal fish from the well. The design of this rugged, dependable, and inexpensive internal catch fishing tool ensures positive engagement, easy release, and re-engagement such as pack-off assemblies and internal cutters.



The Releasing Spear consists of a mandrel, grapple, releasing ring, and a bull nose nut.The mandrel is made of specially heat treated high strength alloy steel; and may be ordered either as a flush type to enter completely into a fish or as a shoulder type



Releasing Spear


Designed and manufactured according to API spec 7-1.

It is pulled from the inside diameter of the fallen fish.

It can be used with internal cutter, jar and other tools.

If the fish can’t be picked up, pick up the spear.



Techanical Specification

ModelO.D / inThread Conn.(LH)Catch Size
DLM-T483 3/4NC2639.7-41.9
DLM-T604 1/8NC3149.7-51.9
DLM-T734 1/8NC3161.5-78
DLM-T894 3/4NC3875-91
DLM-T1024 3/4NC3888.2-102.8
DLM-T1144 3/4NC3899.8-103
DLM-T1275NC38107-116
DLM-T1405 1/2NC38118-128
DLM-T1787NC50153-166


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