Patent ID: 8752651

Claim:
A downhole tool assembly for forming a lateral borehole within a subsurface formation from an existing wellbore using hydraulic forces that are directed through a jetting hose, the wellbore having been completed with a string of production casing defining an inner diameter, and the tool assembly comprising: a hose-bending section comprising a whipstock member having a curved face, with the curved face defining a bend radius for the jetting hose; a pin, wherein: the whipstock member is configured to rotate about the pin from a first run-in position, to a second set position in response to a force applied to the tool assembly, and in the set position, the whipstock member is configured to receive the jetting hose and to direct the letting hose across the entire inner diameter of the production casing to a window location in the production casing; and a hose guiding section comprising: a deflecting body having an upper end and a lower end, wherein the upper end of the deflecting body has a beveled surface defining a face for deflecting the jetting hose within the wellbore; a longitudinal channel along an outer diameter of the deflecting body for receiving and guiding the jetting hose to the whipstock member at a point adjacent the production casing opposite the window; and a fishing neck, wherein the fishing neck has an upper end dimensioned to be connected to a run-in tool, and a lower end dimensioned to be received within the upper end of the deflecting body of the hose-guiding section.