Clifford W Petersen, John M Bednar, Edwin J Hocker Jr, David H Gauger, James M Henderson: Acoustic transmitter and method to produce essentially longitudinal, acoustic waves. Exxon Production Research Company, Motorola, Robert B Martin, February 2, 1982: US04314365 (57 worldwide citation)

A portable, electrohydraulic, acoustic transmitter releasably attaches to a solid medium such as a drill string to generate essentially longitudinal, acoustic signals in the medium. The signals are frequency modulated so that encoded messages may be transmitted between a surface and subsurface locat ...

John M Bednar, Daniel P Postler, Terry V Jones: Acoustically controlled electro-mechanical circulation sub. Exxon Production Research Co, E T Wheelock, February 15, 1983: US04373582 (49 worldwide citation)

This invention relates to a self-contained circulation sub which may be operated upon control from the surface. It may be in the shape of a short section of drill collar and utilizes a sleeve valve to cover the circulation ports. Upon reception of an acoustic signal from the surface, a control valve ...

John M Bednar: Subsea tree cap well choke system. Exxon Production Research Company, C Milton Fick, April 30, 1991: US05010956 (45 worldwide citation)

A choke arrangement useful in subsea completions in a subsea tree cap. The subsea choke arrangement allows for refitting of existing subsea tree arrangements to allow for the installation of a choke arrangement that can be easily maintained and removed. Also, a choke arrangement is shown that allows ...

John M Bednar, Clifford W Petersen: Acoustically actuated downhole blowout preventer. Exxon Production Research Co, E T Wheelock, January 11, 1983: US04367794 (43 worldwide citation)

An acoustically operated downhole blowout preventer using a specially configured sleeve valve to inflate a resilient packer for shutting the wellbore annulus.

John M Bednar: Flowline extendable pigging valve assembly. ExxonMobil Upstream Research Company, February 6, 2001: US06182761 (29 worldwide citation)

An apparatus and a method for extending subsea hydrocarbon flowlines from an initial installation on a template/manifold system to later drilled subsea wells. The extension utilizes a pigging valve assembly which completes a flow path to allow for line cleaning or pigging and is modified by adding a ...

Jere A Noerager, Daniel G Taft, John M Bednar: Riser tensioner system. Exxon Production Research Company, Robert B Martin, June 9, 1981: US04272059 (26 worldwide citation)

A tensioner system is disclosed for applying tension to a riser pipe extending between a floating vessel and the sea bottom. The tensioner comprises a guide means fixed onto the floating vessel for restraining guide members from substantial lateral movement relative to the vessel while permitting re ...

John M Bednar, Mark A Stair: Extendable semi-clustered subsea development system. ExxonMobil Upstream Research Company, May 9, 2000: US06059039 (12 worldwide citation)

A subsea production system that facilitates the cost effective development of offshore hydrocarbon reserves. The system includes a template base, a wellhead assembly, a saddle manifold, flowlines, a subsea tree assembly, and a control center. The system facilitates phased development by allowing con ...

Dale V Johnson, John M Bednar: Annular gas trap. Exxon Production Research Co, John S Schneider, October 7, 1986: US04615387 (5 worldwide citation)

Well apparatus for use in injecting corrosion inhibitor into the annulus between casing and tubing strings below an injection/packer assembly positioned in such annulus which includes an annular gas trap positioned below the injection/packer assembly. The annular gas trap comprises a plurality of in ...