A new method for determining the formation temperature from bottom-hole temperature logs

摘要

Earlier, the authors proposed a new method for prediction of formation temperatures in permafrost regions from temperature logs in deep wells, and developed working formulas to process field data. The application of the proposed method on predicting the undisturbed formation temperature does not depend: (a) on thewell drillinghistory (vertical depth versus time and stops in mud circulation), (b) on the knowledge ofthermal diffusivityof formations and well radius. This method is based on using only three values of shut-in temperatures. Our investigation indicates that for bottom-hole temperature (BHT) tests, where the thermal disturbance of formations is caused mainly by one short (3-24 hours) continuousdrilling fluidcirculation period, the developed earlier method can be utilized for processing results of BHT surveys. The results of bottom-hole temperature surveys in three wells and data for one simulated example were used to validate our proposal. We suggest that application of this procedure in oil and gas industry will increase the reliability of temperature field BHT tests.