Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1994-12-09
1998-05-26
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324343, G01V 328
Patent
active
057571910
ABSTRACT:
An induction logging sonde is disclosed for detecting the resistive properties of formations traversed by a wellbore. The transmitting and receiving circuitry of the induction sonde comprises triads of orthogonally wound transmitters and receivers that are capable of being driven in such a fashion as to electrically rotate the coils to emulate coils that are either perpendicular or parallel to the bedding planes in a dipping formation. These rotations can be varied at any depth by using the information of the dip and strike angles obtained from a pulsed method of operation of the sonde. Once the dip angle and strike angles are ascertained, the electronic rotation is chosen to orient the coils parallel to the bedding planes, thereby producing logs which are devoid of horns, while at the same time producing regional dip and strike angles. In addition, the electronic rotation is also chosen to orient the coils perpendicular to the bedding planes to measure electrical anisotropy.
REFERENCES:
patent: 3510757 (1970-05-01), Huston
patent: 4360777 (1982-11-01), Segesman
patent: 4739272 (1988-04-01), Griffin et al.
patent: 4980643 (1990-12-01), Gianzero et al.
The response of an induction dipmeter and standard induction tools to dipping beds, Stan Gianzero and Shey-Min Su; Geophysics, vol. 55, No. 9 (Sep. 1990); pp. 1128-1140.
Directional Induction Logging Methods; Motoyuki Sato, Jun Fuziwara, Makoto Miyairi, Koji Kashihara and Hiroaki Niitsuma; Dept. of Resources Engineering, Faculty of Engineering, Tohoku University, Sendai 980-77, Japan.
Beam Steering an Induction Sonde in Dipping Beds; Stan Gianzero; Sensor Modeling, Inc. Confidential Research Proposal, Oct. 10, 1994.
Beam Steering an Induction Sonde in Dipping Beds; Stan Gianzero; Sensor Modeling, Inc. Confidential Research Proposal, Oct. 24, 1994.
Halliburton Energy Service,s Inc.
Snow Walter E.
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