QFT II

In October 1999, Epoch introduced the use of Texaco's patented QFT2 technology on a deepwater exploration well for a major operator in the Gulf of Mexico. The new QFT2 represents a significant improvement over the previous QFT technology in that it utilizes 2 fluorescence excitation wavelengths (287nm and 365nm respectively) instead of one single wavelength set at 320nm. This allows the lighter fraction single-and double-ring aromatic hydrocarbons to be detected and quantified with a much higher degree of accuracy. This improved technology is also immune to the effects of pipe dope and other mud additives, which cause false positive readings in the original QFT technique.

The QFT2 technology requires a re-designed Turner Instruments® AU-10 Fluorometer with a dual wavelength switch allowing the operator to toggle between the two excitation wavelengths during sample analysis. Another improvement consists of a data analysis program that can be conveniently run on a laptop computer connected to the AU-10 Fluorometer via RS 232 link. Data results are expressed as an estimate of API Gravity and Weight Percent Oil and can be plotted versus depth on a custom mudlog format. The QFT2 results are then stored in a well database for later export via ASCII or Excel.

Developed by Texaco's Upstream Technology Division in the late 1980's, QFT is a rapid and inexpensive method for accurately determining the hydrocarbon content of drill cuttings. The technique can be performed as a real time evaluation technique at the wellsite or run on samples in the laboratory. All Epoch personnel performing QFT2 have completed a thorough training course provided by Texaco's Upstream Technology Division located in Houston, Texas.