Numerical simulation of wellbore and formation tem

Authors: Baozhi Pan Ding Li Gang Chen Qincong Wang Lixin Ma Sihui Liu

Publish Date: 2014/05/07

Volume: 11, Issue: 2, Pages: 293-299

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Abstract

Temperature curves reflect geothermal gradients and local temperature anomalies thus providing a new understanding of the underground reservoir conditions When encountering caverns or fractures and fissures during drilling lost circulation may occur and result in a change to the original formation temperature field and in severe cases even the conventional open hole well logging data cannot be obtained This paper uses finite element analysis software COMSOL to establish a heat transfer model for the wellbore/reservoir formation system during drilling and shutin in the presence of lost circulation and a case study is made in a carbonate reservoir in the Tahe oilfield On the basis of the above we analyze the temperature distribution in the leakage zone and the studies have shown that the leakage and petrophysical properties have an impact on the temperature of the wellbore and formation hence we can estimate the reservoir permeability using the temperature data In addition the determination of the temperature recovery time after some drilling fluids have leaked into the formation will help in recognizing the subsurface temperature field of the carbonate formation correctly thus enhancing production logging interpretation accuracy and improving the understanding of later measurements

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