Large head downhole chemical cutting tool

In a downhole chemical cutting tool having an elongated tool body adapted to be inserted into a conduit and positioned at a downhole location thereof for effecting a cutting action in said conduit, the combination comprising:

• a) a chemical section in said elongated tool body adapted to contain a chemical cutting agent;
• b) a cutting section in said elongated tool body adapted to receive said chemical cutting agent from said chemical section and having an interior chamber for the distribution of said chemical cutting agent;
• c) a plurality of externally upset cutting heads extending outwardly from said cutting section along circumferentially spaced transverse axes, each of said cutting heads having an outer cutting surface;
• d) each of said cutting heads having a plurality of cutting ports extending radially inward from the outer cutting surface thereof and in fluid communication with said internal chamber within said cutting section;
• e) expansible slip means in said elongated tool body for anchoring said tool body as said cutting agent is dispelled from said cutting ports;
• f) a pressure generating section in said tool body within which pressure is generated to actuate said expansible slip means and to displace cutting agent from said chemical section into said cutting section;
• and
• g) centralizer means located in said elongated tool body above said slip means and said cutting section and comprising a plurality of outwardly projecting bow spring arms to effect a centralizing action of said tool when inserted within a conduit.

In a downhole chemical cutting tool having an elongated tool body adapted to be inserted into a conduit and positioned at a downhole location thereof for effecting a cutting action in said conduit, the combination comprising:

• a) a chemical section in said elongated tool body adapted to contain a chemical cutting agent;
• b) a cutting section in said elongated tool body adapted to receive said chemical cutting agent from said chemical section and having an interior chamber for the distribution of said chemical cutting agent and at least one cutting port for the discharge of said cutting agent from said cutting section;
• c) a pressure generating section in said tool body within which pressure is generated to displace cutting agent from said chemical section into said cutting section;
• d) centralizer means located in said elongated tool body comprising a plurality of outwardly projecting expansible bow spring arms spaced circumferentially around said elongated tool body to effect a centralizing action of said tool when said tool is inserted within a conduit, said bow spring arms being fixably secured to said elongated tool body at a first longitudinal position and slidably secured to said elongated tool body at a second longitudinally spaced position by means of a piston to which bow spring arms are secured, said piston being slidably mounted on said elongated tool body;
• and
• e) means responsive to pressure from said pressure generating section for expanding said bow spring arms to anchor said tool as said cutting agent is dispelled from said cutting port.

In a downhole chemical cutting tool having an elongated tool body adapted to be inserted into a conduit and positioned at a downhole location thereof for effecting a cutting action in said conduit, the combination comprising:

• a) a chemical section in said elongated tool body adapted to contain a chemical cutting agent;
• b) a cutting section in said elongated tool body adapted to receive said chemical cutting agent from said chemical section and having an interior chamber for the distribution of said chemical cutting agent and at least one cutting port for the discharge of said cutting agent from said cutting section;
• c) a pressure generating section in said tool body within which pressure is generated to displace cutting agent from said chemical section into said cutting section;
• d) centralizer means located in said elongated tool body comprising a plurality of outwardly projecting expansible bow spring arms to effect a centralizing action of said tool when said tool is inserted within a conduit;
• e) means responsive to pressure from said pressure generating section for expanding said bow spring arms to anchor said tool as said cutting agent is dispelled from said cutting port;
• f) second anchoring means on said tool body spaced from said centralizer means and comprising expansible slips for anchoring said tool body at a second longitudinally spaced position in response to the generation of pressure within said pressure generating section.