| Title | Modeling and Investigation of Static Formation Temperature Test (SFTT) Using Numerical Simulation |
|---|---|
| Authors | W. Afuar, A. Perdana Putra, J. Situmorang, R. Martikno, N. Miryani Saptadji |
| Year | 2016 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | Static Formation Temperature Test (SFTT), Horner Methods, numerical simulation, undisturbed temperature estimation |
| Abstract | SFTT is one of important test in drilling operation. In Indonesia, especially in Muara Laboh and Rantau Dedap, SFTT has been used to estimate undisturbed temperature and guide the setting of production casing shoe (PCS) of the first 2-3 exploratory wells. The SFTT data are processed and analyzed to provide undisturbed formation temperature estimation by utilizing several methods, including Horner, Brennand, Ascencio, and Roux method. In the overall error rate of those methods is in the range of 10-30%, herewith they still need to be improved. Given the high costs required and stuck-pipe risk exposures, which are associated with SFTT run, the test is expected to achieve a substantial degree of accuracy. Therefore in this study, a numerical procedure is employed to simulate a real physical condition during SFTT. That procedure is selected due to its flexibility and simplicity in understanding the heat transfer process. The TOUGH2-EOS1 software is used to carry out the numerical modeling to obtain SFTT data. Following the numerical modeling, the undisturbed temperature parameter is calculated by different methods: Horner, Brennand, Ascencio and Roux. The result proved that those methods still need to be improved to obtain a more accurate undisturbed temperature estimate. In this paper, it is proposed to have the improved estimation by creating new correlation based on Horner method. This correlation had been applied to calculate undisturbed temperature in synthetic data and Rantau Dedap, the result give the error rate less than 10%. |