Improved method for estimating static formation temperatures in geothermal and petroleum wells. (September 2015)

• Record Type: Journal Article
• Authors: Wong-Loya, J.A.; Andaverde, J.A.; del Rio, J.A.
• Is Part Of: Geothermics. Volume 57(2015:Sep.)
• Page Start: 73
• Page End: 83
• Publication Date: 2015-09
• Subjects: Rational function -- Uncertainties -- Geothermal -- Petroleum -- Borehole -- Least squares; Hydrogeology -- Periodicals; Geothermal resources -- Periodicals; Énergie géothermique -- Périodiques; GEOTHERMAL ENGINEERING; GEOTHERMAL ENERGY; GEOTHERMAL EXPLORATION; Geothermal resources; Hydrogeology; Periodicals; Electronic journals; 621.44
• DOI: 10.1016/j.geothermics.2015.06.002
• Languages: English
• ISSNs: 0375-6505

Abstract

Graphical abstract: Highlights: A new method for estimating static formation temperature was developed, validated and applied. The equations for obtaining the model and its uncertainties were developed. Thermophysical properties of drilling mud and rock formation are not needed. The method also reproduces the thermal recovery process. Abstract: This paper describes a mathematical method for estimating static formation temperatures using a function based on extrapolation of the measured data in the thermal recovery process of geothermal and petroleum wells. This method uses the least squares fit of a rational polynomial model to describe the transient temperature data and also provides an analytical expression of thermal recovery processes. This expression gives the asymptotic value for final temperature. We then apply this method for estimating static formation temperatures of a geothermal and petroleum drilled well. In this work we have developed the equations of least squares fit of rational polynomial function and used the equation to estimate the uncertainties of its coefficients. This fitting procedure allows us to obtain a mathematical model that represents the thermal recovery process and to extrapolate the value of final temperature. This is a practical method to estimate static formation temperature, having the advantages that the thermal properties of the drilling mud and its formation are not required; it can also be used in the geothermal and petroleum industries.