Determination of virgin formation temperature

Details Determination of virgin formation temperature Determination of virgin formation temperature

2005-06-14

2005-06-14

Verbitsky, Gail (Department: 2859)

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

C374S025000, C374S102000, C073S152010, C702S011000, C324S324000, C324S332000

Reexamination Certificate

active

06905241

ABSTRACT:
A method for determining virgin formation temperature of earth formations surrounding a borehole is provided. The time duration of drilling fluid circulation and the time after cessation of drilling fluid circulation at the borehole depth regions of interest are tracked. At a particular borehole depth region of interest, fluid flows from the formations into a device in the borehole, and the temperature of the fluid as a function of time with respect to initiation of fluid flow is measured. The thermal history of formations surrounding the particular borehole depth region is modeled for a cooling phase during drilling fluid circulation, a temperature build-up phase after cessation of drilling fluid circulation, and a formation fluid flow phase after initiation of fluid flow. The model and temperature measurements are used to determine a trend of temperature evolution and the virgin formation temperature by extrapolation from the trend.

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