31
Orban Jacques, Squire Roy: Sonic vibration telemetering system.. Anadrill Int, Schlumberger Services Petrol, July 28, 1993: EP0552833-A1 (21 worldwide citation)

In accordance with illustrative embodiments of the present invention, a sonic vibration transmitter that is used, for example, in telemetering measurements made while drilling includes a body that mounts a stack of ceramic crystals which generate bursts of sonic vibrations when excited by encoded el ...


32
Hache Jean Michel D, Moulin Pierre A, Phillips Wayne J: Motion compensation apparatus and method for determining heading of a borehole.. Anadrill Int, Schlumberger Services Petrol, April 5, 1995: EP0646696-A1 (21 worldwide citation)

A method and apparatus is disclosed for measuring motion signals of gyroscopes in downhole instruments used to determine the heading of a borehole. An illustrative embodiment of the invention includes a measuring-while-drilling system which may experience motion even while the drill string is suspen ...


33
Detournay Emmanuel: Method of determining the drilling conditions associated with the drilling of a formation with a drag bit.. Anadrill Int, Schlumberger Services Petrol, January 15, 1992: EP0466255-A2 (20 worldwide citation)

This invention is based on a new model describing the drilling process of a drag bit and concerns a method of determining the drilling conditions associated with the drilling of a borehole through subterranean formations, each one corresponding to a particular lithology, the borehole being drilled w ...


34
Daniel Codazzi: Method of and apparatus for detecting an influx into a well while drilling. Anadrill, Gary L Bush, Wayne I Kanak, John J Ryberg, January 4, 1994: US05275040 (19 worldwide citation)

Gas influx into a wellbore, which is commonly referred to as a "kick", is detected during active drilling of the borehole. In a preferred embodiment of the invention a determination of mud pump noise round trip transit time T by evaluating a function T=(n-.PHI./2.pi.)f where .PHI. is the phase betwe ...


35
Klaus J Zanker, Jacques Orban: Method and system for measurement of fluid flow in a drilling rig return line. Anadrill, David P Gordon, John J Ryberg, November 12, 1991: US05063776 (19 worldwide citation)

Improved methods and systems are provided for determining a volumetric flow rate of mud in a return line without the aid of a velocity probe. A mud level sensor is located in a return line chimney preferably in close proximity to the bell nipple. The sensor senses the height of the mud flowing in th ...


36
Kostek Sergio, Chang Shu Kong, Mcdaniel Gordon L, Plona Thomas, Randall Curtis, Masson Jean Pierre, Mayes James C, Hsu Kai: Method of sonic logging while drilling a borehole traversing an earth formation.. Anadrill Int, Schlumberger Services Petrol, November 2, 1995: EP0679910-A2 (18 worldwide citation)

The present invention is directed to sonic logging while drilling. A transmitter (34) and at least one receiver (36) are mounted on a drill collar (32) for performing sonic investigations of the formation traversed by a borehole. It has been discovered that a drill collar has a natural stop band or ...


37
Sheppard Michael Charles: Directional drilling method and apparatus. Anadrill Int, June 21, 1995: GB2284837-A (18 worldwide citation)

A method for causing deviation of borehole being drilled by rotary drilling uses a bit having at least one nozzle 42 through which a drilling fluid is caused to flow such that in use, the flow of drilling fluid through the nozzle allows one sector of the bit to cut more effectively than the remainde ...


38
Dorel Alain P: Apparatus and method for directional drilling using coiled tubing. Anadrill Int, Schlumberger Services Petrol, August 6, 1997: EP0787886-A2 (17 worldwide citation)

A steerable directional drilling tool assembly includes a bent housing (12) defining a bend angle and having a mud motor (13) in its upper section and a drill bit (15) below its lower section, an orienting tool (17) rotatably coupled to such upper section and suspended on coiled tubing (20) that ext ...


39
Malone David L, Neme Eric E: Flow segregator for multi-drain well completion. Anadrill Int, Schlumberger Services Petrol, July 30, 1997: EP0786578-A2 (17 worldwide citation)

A multi-lateral well completion system segregates and prevents commingling of the production fluids flowing from a plurality of lateral wellbores which extend outward from a main wellbore. The system includes a segregator body member that is positioned and oriented in the main wellbore adjacent the ...


40
Coles Mark: Method to improve directional survey accuracy.. Anadrill Int, Schlumberger Prospection, August 29, 1990: EP0384537-A1 (13 worldwide citation)

A method is proposed for better determining the azimuth and inclination of a borehole in which a priori information regarding the magnitude of the earth's gravitational field strength, its magnetic field strength and direction are utilized to constrain the measured components of the earth's gravitat ...