Downhole tool with cones and slips

A downhole tool device disposable in a casing of an oil or gas well, the device comprising:

• a) a mandrel;
• b) an element carried by the mandrel and axially displaceable along the mandrel during setting and compressible and radially expandable to seal between the mandrel and the casing when set;
• c) at least one a slip ring carried by the mandrel and radially expandable during setting to engage the casing when set;
• d) at least one cone carried by the mandrel and adjacent the at least one slip ring and axially displaceable during setting to radially displace the slip ring;
• e) a lower anvil fixed with respect to the mandrel;
• f) an upper push sleeve carried by the mandrel, with the element, the at least one slip ring and the at least one cone located between the upper push sleeve and the lower anvil, the upper push sleeve being axially displaceable during setting to press the element, the at least one slip ring and the at least one cone between the upper push sleeve assembly and the lower anvil on the mandrel;
• g) the slip ring having a tapering open end;
• h) the cone having a tapered circular frusto-conical end insertable into the tapering open end of the slip ring;
• i) the slip ring and the cone having mating flat facets circumscribing an interior of the open end of the slip ring and an exterior of the end of the cone, and the flat facets oriented at an acute angle with respect to a longitudinal axis of the mandrel;
• j) the flat facets formed at discrete intervals around the tapered circular frusto-conical end of the cone and interrupted by intervening portions of the tapered circular frusto-conical end, the flat facets of the cone being substantially flush with the intervening portions along the entire longitudinal length of the flat facets to form a substantially smooth circumference around the flat facets free of raised ridges between the flat facets;
• and
• k) the slip ring having a plurality of slots circumscribing the slip ring and alternating with the flat facets, the plurality of slots extending from the open end of the slip ring at least partially along the flat facets, and the slots being free of the cone or structure thereof.

A frangible cone and slip system configured for a downhole tool device disposable in a casing of an oil or gas well, the system comprising:

• a) a slip ring disposable on a mandrel and radially expandable to engage the casing;
• b) a cone disposable on a mandrel adjacent the slip ring to radially displace the slip ring;
• c) the slip ring and the cone having mating ends, with the slip ring having a tapering wider open end, and the cone having a tapering narrower end insertable into the open end of the slip ring;
• d) an interior of the open end of the slip ring and an exterior of the tapering narrower end of the cone each having discrete flat facets circumscribing an interior of the open end of the slip ring and an exterior of the tapering narrower end of the cone;
• and
• e) the tapering narrower end of the cone having a substantially smooth circumference circumscribing the flat facets, the substantially smooth circumference being free of raised ridges between the flat facets, the substantially smooth circumference extending along an entire longitudinal length of the flat facets and tapering narrower end of the cone.