Hydraulic release system

An apparatus for inserting a tubular coupled to a work duct into an underground cavity having a major axis using a fluid conducted by said work duct comprising:

• a work duct extending from a near-surface end to a tool end when within the cavity;
• a fluid actuated tool for releasably coupling said work duct to said tubular, said tool having a down end connected to said tubular and an up-end attached to said tool end of said work duct and having a fluid passageway in communication with said duct;
• an outer structure connected to said tubular and an inflatable membrane connected to said outer structure for positioning said tubular with respect to said cavity, said membrane outwardly inflatable by said fluid supplied from said fluid passageway;
• an inner duct having a fluid passage from a tool end to a tubular end, said tool end attached to said down end and said inner duct located at least in part within said fluid passageway to form a first inner annulus between said membrane and said inner duct, the inner duct comprising:
• first means for restricting fluid flow from said fluid passage to said inner annulus;
• and
• second means for restricting fluid flow from said fluid passage to a tubular end wherein said second restricting means does not substantially restrict fluid flow through said first restricting means.

An apparatus for conducting a fluid and running a tubular into a cavity having a major axis comprising:

• a work duct having a bore and extending from a first end to a downhole end when within the cavity;
• a fluid-actuated release tool having an up end attached to said downhole end of said work duct, said tool having means for releasably coupling said work duct to said tubular, said tool having a fluid passageway in communication with said bore;
• fluid actuated means for positioning said tubular having a fluid passage and attached proximate to a down end of said tool;
• an inner duct also attached proximate to the down end of said tool and at least in part located within said fluid passage and having a fluid flow seat in fluid communication with said passageway and a fluid part for actuating said means for positioning in fluid communication with said passageway, wherein said fluid flowing through said fluid port can actuate said positioning means when fluid flow past said seat is blocked;
• and
• a tubular attached to said positioning means and generally in fluid communication with said seat.

An apparatus for conducting a fluid and drilling a borehole using a drill bit comprising:

• a work duct having a bore and extending from a first end to a downhole end when within the borehole;
• a fluid-actuated release tool having an up end attached to said downhole end of said work duct, said tool having means for releasably coupling said work duct to said drill bit, said tool having a fluid passageway in communication with said bore;
• fluid-actuated means for contacting walls of the borehole and having a fluid passage, said means attached proximate to a down end of said tool;
• an inner duct also attached proximate to the down end of said tool and at least in part located within said fluid passage and having a fluid flow seat in fluid communication with said passageway and a fluid port for supplying said fluid to said contacting means, said port in fluid communication with said passageway, wherein said fluid flowing through said fluid part can actuate said contacting means when fluid flow from said work duct past said seat is at least partially blocked;
• and
• a drill bit attached to said contacting means and generally in fluid communication with said seat.