High expansion multi-slip frac plug with narrow cross-section

A generally cylindrical downhole apparatus having a first downhole side and a second uphole side and a longitudinal axis, the apparatus comprising:

• an actuator ring having a longitudinal bore co-axially aligned on said longitudinal axis of said downhole apparatus and a first conical frustum portion tapering radially inwardly towards said downhole side;
• a plurality of slip structures each having a bore co-axially situated on said longitudinal axis of said downhole apparatus on the downhole side of the actuator ring, the plurality of slip structures juxtaposed with each other in series, each of the plurality of slip structures having a longitudinal bore and a conical frustum portion tapering inwardly towards the downhole side and being radially outwardly expandable;
• and
• a first end ring having a first portion engaging the downhole side of the most downhole of the plurality of slip structures and a second portion extending longitudinally towards the uphole side along said longitudinal axis from the first portion into the longitudinal bore of the actuator ring and engaging therewith for sandwiching the plurality of slip structures between the actuator ring and the first end ring;
• wherein the actuator ring is longitudinally movable with respect to the first end ring to permit the conical frustum portion of said actuator ring to extend into the bore of a neighboring one of the plurality of slip structures on a side thereof most proximate the uphole side of said downhole apparatus and subsequently actuating each one of the plurality of slip structures to extend the conical frustum portion thereof into the bore of the neighboring one of the plurality of slip structures for radially outwardly expanding each slip structure.

A generally cylindrical downhole apparatus having a downhole end and a second uphole end and a longitudinal axis, the apparatus comprising:

• an actuator ring having a longitudinal bore co-axially aligned on said longitudinal axis of said downhole apparatus and a first conical frustum portion tapering radially inwardly towards said uphole side;
• a plurality of slip structures each having a bore co-axially situated on said longitudinal axis of said downhole apparatus on the uphole side of the actuator ring, the plurality of slip structures mutually juxtaposed with each other in series, each of the plurality of slip structures having a longitudinal bore and a conical frustum portion tapering inwardly towards the uphole side and being radially outwardly expandable;
• a cylindrical seal element having a longitudinal bore situated co-axially with said longitudinal axis;
• a first end ring on an uphole side of said downhole apparatus having a first portion engaging the uphole side of the most uphole of the plurality of slip structures and a second portion extending longitudinally downhole along said longitudinal axis from the first portion into the longitudinal bore of the actuator ring a for sandwiching the plurality of slip structures between the actuator ring and the first end ring;
• wherein the actuator ring is longitudinally movable with respect to the first end ring to permit the conical frustum portion of said actuator ring to extend into the bore of a neighboring one of the plurality of slip structures on a side thereof most proximate the downhole side of said downhole apparatus and subsequently actuating each one of the plurality of slip structures to extend the conical frustum portion thereof into the bore of the neighboring one of the plurality of slip structures for radially outwardly expanding each slip structure and compressing said seal element.