1
David P Herd, John H Fowler: Underwater well completion method and apparatus. McEvoy Oilfield Equipment Co, David M Ostfeld, Murray Robinson, Ned L Conley, October 11, 1977: US04053023 (48 worldwide citation)

Extended casing method and apparatus for completing an underwater well whereby complete and continuous pressure control is maintained at the surface drilling platform. A conductor casing is installed in the floor of a body of water with a casing head and riser attached near the floor. Other casing i ...


2
David P Herd, Duane E Gibson: Seal. Smith International, Ned L Conley David Alan Rose William E Shull, May 29, 1984: US04451047 (41 worldwide citation)

Combined metal-to-metal/compliant material stem sealing means for high pressure, balanced, rising stem gate valve includes at least one seal set at each of the actuator and balance stems. Each seal set comprises a pair of frustoconical metal ring gaskets between which are disposed two make-up rings ...


3
Terry W Pollard, David P Herd, Jack Whiteman: Hydraulic control system for controlling a plurality of underwater devices. Stewart & Stevenson Oiltools, Fulbright & Jaworski, November 23, 1976: US03993100 (40 worldwide citation)

A hydraulic control system for controlling a plurality of remotely positioned hydraulically actuated underwater devices by a single hydraulic control line extending underwater. A reference hydraulic manifold is connected to the single control line and a signal hydraulic manifold is connected to the ...


4
David P Herd: High pressure gate valve with preloaded, stacked, solid lubricated stem seals. Smith International, David Alan Rose, Ned L Conley, William E Shull, July 20, 1982: US04340204 (36 worldwide citation)

A high pressure gate valve having at least one pressure actuated seal means between the bonnet part of the valve body and the valve actuating stem and between the chamber part of the valve body and the valve actuating stem is disclosed. Each seal means includes at least one seal assembly. Each seal ...


5
David P Herd: Fail-safe, non-pressure locking gate valve. Smith International, David Alan Rose, Murray Robinson, Ned L Conley, October 13, 1981: US04294284 (30 worldwide citation)

A fail-safe non-pressure locking valve, actuated by hydraulic controls responsive to ambient sea pressure, disposed over 1000 feet below the surface on a submerged pipeline controlling the flow of fluids therethrough. The valve includes a housing having a chamber within which a gate, having upper an ...


6
John Walton McCaskill, Robert D Barnett, David P Herd: High pressure valve. McEvoy Oilfield Equipment Co, David M Ostfeld, Murray Robinson, Ned L Conley, June 14, 1977: US04029294 (29 worldwide citation)

A valve comprising a housing with an inlet and outlet and a chamber in between, a reciprocating gate mounted in a gate seat disposed within the chamber for opening and closing the valve, an upper bonnet for closing the chamber at one end and a lower bonnet for closing the chamber at the other end, t ...


7
David P Herd, John H Fowler: Underwater well completion method and apparatus. McEvoy Oilfield Equipment Co, David M Ostfeld, David Alan Rose, Ned L Conley, July 27, 1976: US03971576 (27 worldwide citation)

Extended casing method and apparatus for completing an underwater well whereby complete and continuous pressure control is maintained at the surface drilling platform. A conductor casing is installed in the floor of a body of water with a casing head and riser attached near the floor. Other casing i ...


8
David P Herd, John W McCaskill, Thomas W Childers: Balanced stem fail-safe valve system. Exxon Production Research Company, John S Schneider, January 20, 1976: US03933338 (26 worldwide citation)

A balanced stem fail-safe valve controls flow of fluids through a submerged pipeline. A closed subsea hydraulic pressure system operates or powers the valve. In the fail-safe mode the operating or reservoir pressure equals ambient sea pressure. A valve housing is arranged on the pipeline and a valve ...


9
David P Herd, John H Fowler: Underwater well completion method and apparatus. McEvoy Oilfield Equipment Co, David Alan Rose, Murray Robinson, Ned L Conley, August 17, 1976: US03974875 (14 worldwide citation)

Extended casing method and apparatus for completing an underwater well whereby complete and continuous pressure control is maintained at the surface drilling platform. A conductor casing is installed in the floor of a body of water with a casing head and riser attached near the floor. Other casing i ...


10
David P Herd: Single double backseat. McEvoy Oilfield Equipment Company, Ned L Conley, David Alan Rose, David M Ostfeld, June 9, 1981: US04272055 (13 worldwide citation)

A valve comprising a housing with an inlet and outlet and a chamber in between, a reciprocating gate mounted in a gate seat disposed within the chamber for opening and closing the valve, an upper bonnet for closing the chamber at one end and a lower bonnet for closing the chamber at the other end, t ...