초록 ▼

The present invention is an oilfield wireline fishing tool with expansible wings. The wings open up in umbrella fashion after leaving production tubing allowing the fishing tool to cover the entire diameter of the well casing. Upon reentry into tubing the wings compress enabling the fishing tool and

The present invention is an oilfield wireline fishing tool with expansible wings. The wings open up in umbrella fashion after leaving production tubing allowing the fishing tool to cover the entire diameter of the well casing. Upon reentry into tubing the wings compress enabling the fishing tool and lost tool to be pulled to the surface. The wings are secured to the tool by leaf springs. A collar is placed over the leaf springs at the down-hole end of the tool in order to secure the leaf springs to the tool. This design allows the tool to be constructed with a diameter small enough to fit through production tubing. The uphole end is suited for attachment to a wireline bridle.

대표청구항 ▼

A through tubing, cased hole, wireline fishing tool, comprising: a tool housing of essentially a tubular form and having a longitudinal axis and up-hole and down-hole ends; means for coupling said fishing tool to a wireline bridle apparatus disposed at said up-hole end; a tool base attached to said

A through tubing, cased hole, wireline fishing tool, comprising: a tool housing of essentially a tubular form and having a longitudinal axis and up-hole and down-hole ends; means for coupling said fishing tool to a wireline bridle apparatus disposed at said up-hole end; a tool base attached to said down-hole end of said tool housing, said tool base being essentially a continuation of said tool housing and having an axis that is concentric with said tool housing; a plurality of leaf springs each having a fixed end and a free end, said leaf springs being of a curved shape; said fixed end of each of said leaf springs being disposed on an outer peripheral surface of said tool base and extending, in a downhole direction, radially away from said axis of said tool base; a tubular collar, said collar being disposed in surrounding relation to said fixed ends and said down-hole end so as to fixedly hold a portion of said leaf springs near said fixed end in contact with said outer surface of said tool base; a plurality of wings, each of said wings being fixedly attached to one of said leaf springs along a portion of said free end of said leaf springs; latching means located within said tool for latching on to a lost piece of equipment; and said curvature of said leaf springs being such that said wings will expand from an overlapped position corresponding to a minimum diameter to conform to a casing inner diameter of said cased-hole well.