United States Patent m
Mumby
[54] WELL LOGGING APPARATUS HAVING A REMOVABLE SLEEVE FOR SEALING AND PROTECTING MULTIPLE ANTENNA ARRAYS
[75] Inventor: Edward S. Mumby, Houston, Tex. [73] Assignee: Halliburton Company, Houston, Tex.
[21] Appl. No.: 259,638
[22] Filed: Jun. 14, 1994
[51] Int. CI.6 G01V 3/18; G01V 3/28;
F21B 49/00
[52] U.S. CI 324/339; 73/152.02; 175/50;
324/338; 324/369
[58] Field of Search 324/323, 338-344,
324/347, 356, 369; 166/250; 175/40, 50, 321; 73/151, 152; 367/25, 35; 250/254,
256
[56] References Cited
U.S. PATENT DOCUMENTS
Re. 32,913 4/1989 Clark 324/338
2,264,318 12/1941 Lee 324/339
2,964,698 12/1960 Lehmberg, Jr. 324/339
3,377,549 4/1968 Newman et al 324/342
4,401,947 8/1983 Cox 324/339
4,494,072 1/1985 Jeter et al 324/347
4,511,843 4/1985 Thoraval 324/338
4,514,693 4/1985 Meador 324/338
III 11111 IIIIIH^
US005563512A
[ii] Patent Number: 5,563,512 [45] Date of Patent: Oct. 8,1996
4,553,097 11/1985 Clark 324/338
4,651,101 3/1987 Barber et al 324/339
4,659,992 4/1987 Clark et al 324/338
4,785,247 11/1988 Meador et al 324/338
4,949,045 8/1990 Clark et al 324/338
5,134,285 7/1992 Perry et al 250/254 X
5,453,693 9/1995 Sinclair et al 324/338 X
FOREIGN PATENT DOCUMENTS
2146126 4/1985 United Kingdom G01V 3/30
OTHER PUBLICATIONS
Coope, Dan, et al, "The Theory of 2 MHz Resistivity Tool and its Application to Measurement-While-Drilling," The Log Analyst, pp. 35^16 (May-Jun. 1984).
Primary Examiner—Gerard R. Strecker
Attorney, Agent, or Firm—Conley, Rose & Tayon, P.C.
[57] ABSTRACT
A well logging apparatus is disclosed having an elongate body supporting a plurality of antenna coils housed in recesses formed on the body. A sleeve covers the segment of the body containing the antenna recesses and seals the antennas from borehole fluids. Electronics compartments formed in the body for housing signal conditioning circuitry are likewise sealed by the sleeve. The sleeve includes slotted regions filled with a sealant, the slotted regions being disposed about the antenna coils and providing an electromagnetically transparent window through the sleeve.
47 Claims, 6 Drawing Sheets
