| US 7,556,104 B2 | ||
| System and method for processing and transmitting information from measurements made while drilling | ||
| Benjamin Peter Jeffryes, Histon (United Kingdom) | ||
| Assigned to Schlumberger Technology Corporation, Ridgefield, Conn. (US) | ||
| Filed on Mar. 11, 2008, as Appl. No. 12/46,257. | ||
| Application 12/046257 is a division of application No. 10/732995, filed on Dec. 11, 2003, granted, now 7,363,988. | ||
| Claims priority of application No. 0228893.4 (GB), filed on Dec. 11, 2002. | ||
| Prior Publication US 2008/0216568 A1, Sep. 11, 2008 | ||
| Int. Cl. E21B 47/12 (2006.01) | ||
| U.S. Cl. 175—40 [175/24; 175/48] | 8 Claims |
| 1. A method for making measurements in a wellbore, comprising the steps of:
measuring downhole a first parameter;
calculating a first mean and a first variance for the first parameter;
measuring downhole a second parameter;
calculating a second mean and a second variance for the second parameter;
calculating a covariance between the first and the second downhole parameters;
transmitting the first mean, the first variance, the second mean, the second variance and the covariance to the surface; and
generating a multi-channel data envelope from the first mean, the first variance, the second mean, the second variance and
the covariance.
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