1
Clark E Robison, Robert C Pahmiyer, Paul D Ringgenberg: Apparatus and method for perforating a subterranean formation. Halliburton Energy Services, Peter V Schroeder, June 29, 2004: US06755249 (79 worldwide citation)

Method and apparatus are presented for perforating a subterranean formation so as to establish fluid communication between the formation and a wellbore, the wellbore having casing cemented therein, the casing having a cement sheath therearound. The casing is perforated with a mechanical perforator a ...


2
Paul D Ringgenberg, Daniel A Newman, Harold K Beck: Round mandrel slip joint. Halliburton Company, Joseph A Walkowski, Neal R Kennedy, September 15, 1987: US04693316 (62 worldwide citation)

A slip joint for use in a well string and having a removable torque transmitting key. The slip joint includes an outer female mandrel having a central opening therethrough in which is slidingly positioned a male mandrel, also defining a central opening therethrough. In one embodiment, the male mandr ...


3
Roger L Schultz, H Kent Beck, Paul D Ringgenberg, Ronald L Hinkie: Early evaluation by fall-off testing. Halliburton Company, William M Imwalle, C Clark Dougherty Jr, September 17, 1996: US05555945 (57 worldwide citation)

Early evaluation testing of a subsurface formation is provided by monitoring pressure fall-off in the formation. This is accomplished by providing a column of fluid in the well having an overbalanced, hydrostatic pressure at the subsurface formation greater than a natural formation pressure of the s ...


4
Roger H Schultz, H Kent Beck, Paul D Ringgenberg: Early evaluation system. Halliburton Company, William M Imwalle, C Clark Dougherty Jr, July 30, 1996: US05540280 (56 worldwide citation)

A number of improvements are provided in early evaluation systems which can be utilized to test and/or treat a subsurface formation intersected by an open uncased borehole. An outer tubing string is run into the well and has a packer which is set in the open, uncased borehole above the subsurface fo ...


5
Paul D Ringgenberg: Multi-mode testing tool and method of use. Halliburton Company, Joseph A Walkowski, January 6, 1987: US04633952 (55 worldwide citation)

A multi-mode testing tool operable as a drill pipe tester, formation tester, nitrogen displacement valve or circulation valve. Tool mode is changed responsive to pressure cycling in the well bore. A ball valve in the tool bore may also be operated by pressure cycling when the tool is in its formatio ...


6
Paul D Ringgenberg, Neal G Skinner: Circulating valve responsive to fluid flow rate therethrough and associated methods of servicing a well. Halliburton Energy Services, William M Imwalle, Marlin R Smith, August 29, 2000: US06109354 (55 worldwide citation)

A circulating valve and associated methods of servicing a well provide reliable operation, economical manufacture, and convenient maintenance in the circulating valve which is responsive to flow of fluid therethrough, and increased versatility in well servicing operations utilizing the valve. In a p ...


7
Harold K Beck, Paul D Ringgenberg, Roger L Schultz, Rodney R Setliff: Apparatus for testing and sampling open-hole oil and gas wells. Halliburton Energy Services, Paul I Herman, Neal R Kennedy, October 27, 1998: US05826662 (54 worldwide citation)

Method and apparatus for testing and sampling open-hole oil and gas wells. The apparatus includes a packer, a surge chamber, a closure valve which may be opened to flow fluid into the surge chamber, and a sampler. The surge chamber may be one of a pair of surge chambers, and the closure valve may be ...


8
Paul D Ringgenberg: Travel joint for use in a subterranean well. Halliburton Energy Services, Wiliam M Imwalle, Paul I Herman, Marlin R Smith, October 20, 1998: US05823264 (52 worldwide citation)

A travel joint provides economical manufacture, installation, service, and operation thereof. The travel joint substantially reduces the number of parts potentially exposed to corrosive fluid, eliminates cavities wherein such corrosive fluid may become trapped, and substantially reduces the number o ...


9
Harrison C Smith, Paul D Ringgenberg: Subsea repeater and method for use of the same. Halliburton Energy Services, Paul I Herman, Lawrence R Youst, January 25, 2000: US06018501 (48 worldwide citation)

A subsea repeater apparatus (48) for communicating information between surface equipment (60) and downhole equipment (44) is disclosed. The apparatus (48) comprises an electromagnetic receiver (66, 68) that receives an electromagnetic signal (46) carrying information from downhole equipment (44) and ...


10
Roger L Schultz, Paul D Ringgenberg, Jimmie R Williamson Jr: Hydraulic control system for downhole tools. Halliburton Energy Services, J Richard Konneker, March 25, 2003: US06536530 (48 worldwide citation)

A hydraulic control system for downhole tools enables convenient selection and actuation of a well tool assembly from among multiple well tool assemblies installed in a well. Each well tool assembly includes a control module having a selecting device and a fluid metering device. A predetermined rang ...