Proof of concept of moving thru casing resistivity apparatus. Annual report, October 1, 1990--September 30, 1991 [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 5 pages : digital, PDF file
- Additional Creators:
- United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- This is a continuing research effort into the new field of measuring the resistivity of geological formations from within cased wells. Original research objectives are summarized as follows: Additional data confirming the feasibility of technology is to be taken in a test well with the existing stophold-and-lock apparatus which is called the Through Casing Resistivity Apparatus (``TCRA``). the already existing TCRA will then be modified mechanically and new electronic components will be fabricated to test the concept of a moving apparatus called the Moving Through Casing Resistivity Apparatus (``MTCRA``); Additional data confirming the feasibility of the technology has been obtained with the existing stop-hold-and-lock Through Casing Resistivity Apparatus (``TCRA``). Data was obtained at the frequency of 1 Hz. The vertical spacing of each voltage measurement electrode pair was approximately 57 inches. The data proves the following: the technology works as generally outlined in various patents on the subject; the cement surrounding the well does not cause substantial measurement difficulties in formations having resistivities above 10 ohm-meters; and the data shows that thin beds can be resolved. The Moving Test Jig is a laboratory instrument which realistically simulates measurements to be done later downhole. It was designed, built, and has undergone many months of testing. The Moving Test Jig has electrodes which engage the interior of a rusty, piece of test casing. It is pulled through the rusty piece of test casing at various speeds of up to about 5 feet per minute. Electrical resistors on the outside of the casing allow conduction of A.C. current off the outside of the test pipe which can be directly measured. The Moving Test Jig then measures these currents independently with the technology developed under the DOE Grant. Agreement among these measurements means that we are properly measuring the parameters necessary to calculate the resistive of formations.
- Published through SciTech Connect.
ParaMagnetic Logging, Inc., Woodinville, WA (United States)
- Funding Information:
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