Determination of Formation Temperature from Bottom-Hole Temperature Logs: A Generalized Horner Method

2015 ◽  
pp. 117-128
Keyword(s):  
Formation Temperature ◽  
Bottom Hole

Bottom‐hole temperature stabilization with continued circulation of drilling mud

Geophysics ◽  
1982 ◽  
Vol 47 (12) ◽  
pp. 1716-1723 ◽  
Author(s):  
M. F. Middleton
Keyword(s):  
Thermal Stabilization ◽  
Well Log ◽  
Formation Temperature ◽  
Drilling Mud ◽  
Physical Conditions ◽  
Bottom Hole ◽  
Hydrocarbon Maturation ◽  
Log Interpretation

Determination of true formation temperature from measured bottom‐hole temperature (BHT) is important for well log interpretation and geothermal studies, especially with the current realization of the role of temperature in hydrocarbon maturation. A “bulk” thermal diffusivity of the borehole‐rock system of approximately [Formula: see text], initially suggested by Leblanc et al (1982), is confirmed by comparison with a two‐media borehole model. In general, time‐consecutive BHT measurements exhibit slower stabilization than those predicted by thermal conduction models. A simple model of thermal stabilization of a borehole with continued circulation after cessation of drilling is proposed. By modeling the thermal sink due to continued circulation of drilling mud as an exponentially decaying sink, thermal stabilization curves more consistent with observation are obtained. A good estimate of true formation temperature can be obtained by a curve‐matching technique where the observed BHT data are well behaved and the physical conditions in the borehole closely match the assumed model. However, it is virtually impossible in some cases to obtain a precise estimate of true formation temperature with BHT measurements from well log runs with current BHT stabilization models.

scholarly journals A Unified Formula for Determination of Wellhead Pressure and Bottom-hole Pressure

2013 ◽  
Vol 37 ◽  
pp. 3291-3298 ◽  
Author(s):  
Mingze Liu ◽  
Bing Bai ◽  
Xiaochun Li
Keyword(s):  
Wellhead Pressure ◽  
Hole Pressure ◽  
Bottom Hole Pressure ◽  
Bottom Hole

Estimation of formation temperature from bottom‐hole temperature measurements: COST ♯1 well, Norton Sound, Alaska

Geophysics ◽  
1988 ◽  
Vol 53 (12) ◽  
pp. 1619-1621 ◽  
Author(s):  
S. Cao ◽  
C. Hermanrud ◽  
I. Lerche
Keyword(s):  
Thermal Conductivity ◽  
Numerical Method ◽  
Time Scale ◽  
Efficiency Factor ◽  
Diffusion Time ◽  
Formation Temperature ◽  
Temperature Estimation ◽  
Bottom Hole ◽  
Free Parameters ◽  
Borehole Temperature

We recently developed a numerical method, the Formation Temperature Estimation (FTE) model, to determine formation temperatures by inversion of borehole temperature (BHT) measurements (Cao et al., 1988a). For more than two BHT measurements, the FTE model can estimate (1) true formation temperature [Formula: see text], (2) mud temperature [Formula: see text] at the time the mud circulation stops, (3) thermal invasion distance R into the formation before the formation is at the true formation temperature, (4) formation thermal conductivity K perpendicular to the borehole, and (5) efficiency factor F for mud heating in the borehole after mud circulation has stopped. The method optimizes three free parameters: τ (diffusion time‐scale), ε (scaling parameter related to the thermal invasion distance R), and [Formula: see text] (normalized efficiency factor for mud heating.

Determination of True Static Formation Temperature from Well Logs

1986 ◽  
Vol 8 (2-3) ◽  
pp. 277-288 ◽  
Author(s):  
Walter H. Fertl ◽  
George V. Chilingarian and Teh Fu Yen
Keyword(s):  
Well Logs ◽  
Formation Temperature
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