COST ESTIMATING RELATIONSHIPS IN ONSHORE DRILLING PROJECTS
Cost estimating relationships (CERs) are very important tools in the planning phases of an upstream project. CERs are, in general, multiple regression models developed to estimate the cost of a particular item or scope of a project. They are based in historical data that should pass through a normalization process before fitting a model. In the early phases they are the primary tool for cost estimating. In later phases they are usually used as an estimation validation tool and sometimes for benchmarking purposes. As in any other modeling methodology there are number of important steps to build a model. In this paper the process of building a CER to estimate drilling cost of onshore wells will be addressed.Keywords: Cost Estimating Relationships. Onshore wells. Upstream projects.
AUGUSTINE, C.; TESTER, J.W.; ANDERSON, B.; PETTY, S.; LIVESAY, B., A comparison of geothermal with oil and gas well drilling costs, Thirty-First Workshop on Geothermal Reservoir Engineering, Stanford University, 2006.
BELSLEY, D. A.; KUH, E.; WELSH, R. E. Regression Diagnostics: Identifying Influential Data and Sources of Collinearity, Wiley, New York, 1980.
BUREAU OF LABOR STATISTICS, Producer Price Indexes: PCU213111213111- Drilling oil and gas wells, Retrieved in 2016, from https://www.bls.gov/ppi/.
CHAMBERS, J.M.; CLEVELAND, W.S.; KLEINER, B.; TUKEY, P.A. Graphical Methods for data Analysis, Wadsworth, Belmont, 1983.
DRAPER, N. R.; SMITH, H., Applied Regression Analysis, 3ed., Wiley, New Jersey, 1998.
FOX, J.; WEISBERG, S., An R Companion to Applied Regression, 2ed., Sage, California, 2011.
KAISER, M.J.; PULSIPHER, A.G. Generalized Functional Models for Drilling Cost Estimation, SPE Drilling & Completion, June, 67-73. 2007.
MILLER, D.M. Reducing Transformation Bias in Curve Fitting, The American Statistician, 38, 124-126. 1984.
OSTWALD, P.F. Engineering Cost Estimating, 3ed., Prentice Hall, New Jersey, 1992.
PETROLEUM ONLINE. Module Drilling & Well Completions. Retrieved in 2016, from www.petroleumonline.com.