US 4,345,646 A · Apparatus for chemical cutting

Abstract

A cylindrical downhole chemical jet cutting tool including a generally cylindrical slip body having pipe gripping slips connected to a co-axially disposed expandable piston-cylinder biased toward a retracted position by a return spring; each slip includes a pivoting head pivotally retained by the slip body and biased toward a retracted from deployed position by a garter spring. Each slip defines at least two sets of gripping teeth having different gripping faces such that each gripping face becomes substantially parallel with the tool body axis as the slip becomes deployed a different respective distance from the tool. A slip expansion mandrel disposed within the slip array deploys the slips into gripping engagement as the piston-cylinder is actuated in response to application of fluid pressure. A chemical fluid cutting means including a fluid chamber defined within the tool body between two diaphragms can rupture from application of a designated differential fluid pressure. The fluid jet discharge part of the tool is adapted to direct fluid chemical from said tool body at high velocity.

Claims12

Dependent claims

A downhole chemical fluid jet cutting tool adapted to be suspended from an electrical wireline comprising in combination:

(a) an elongated generally cylindrical tool body;
(b) a generally cylindrical slip body means forming part of said tool body and comprising a pipe gripping slips array connected into a fluid pressure responsive co-axially disposed expandable piston-cylinder means;
(c) said piston-cylinder means being biased toward a retracted position by elastic return means;
(d) each slip of said slips including a head at a first end being retained by said slip body and being biased toward a retracted position from a deployed position by positive retraction means;
(e) said piston-cylinder means including a slip expansion mandrel means disposed within said slip array to deploy said slips into gripping engagement as said piston-cylinder is actuated against said elastic return means in response to application of fluid pressure;
(f) a chemical fluid cutting means forming part of said tool body including a fluid chamber adapted to contain a fluid chemical defined within said tool body between two diaphragm means provided to rupture from application of a designated differential fluid pressure;
and
(g) a fluid jet discharge means formed in said tool body and adapted to direct fluid chemical from said tool body in selected direction and at high velocity.

5 more elements

Dependencies are inferred from the claim text.

Apparatus for chemical cutting

Life of this patent

Apparatus for chemical cutting

Life of this patent

Abstract

Claims12