Numerical simulation of wellbore and formation temperature fields in carbonate formations during drilling and shut-in in the presence of lost circulation

Petroleum Science, May 2014

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 shut-in 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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Numerical simulation of wellbore and formation temperature fields in carbonate formations during drilling and shut-in in the presence of lost circulation

Pan Baozhi Li Ding Chen Gang Wang Qincong Ma Lixin Liu Sihui - 2 Mathematical modeling eq k eq (1 eq k ) p (1 u ) p p | =0 = 0 + 2.2 Fluid-solid coupling and seepage modeling , 1 P 1 ) u is the velocity -3 1 is-2the . 2 is the reservoir 2 -1 2 is is the reservoir 2.3 Model establishment and simulation 3 Results and discussion 3.1 Numerical simulation of the temperature field values. 1.0 l,m 0.8 e od 0.6 m 0.4 e tfh 0.2 toe 0 a in -0.2 d ro 0.4 o -c -0.6 y 1.0 1.5 2.0 2.5 3.0 3.5 4.0 x-coordinate of the model, m 1.0 1.5 2.0 2.5 3.0 3.5 4.0 x-coordinate of the model, m Fig. 2 5680 5685 m , thp 5690 e D 5695 5700 126.47 Fig. 3 -3 Simulated Measured 126.6305 C ,º 126.6304 e r tau 126.6303 r e p 126.6302 m e t on 126.6301 it a rm126.6300 o F 126.6299 5 7 2 0 5 7 3 0 5 7 4 0 LWH L W H 3 y z 128 C º , e r u t a re126 p m e t d i u lf 124 g n illi r D 122 Fig. 7 5712.69 5722.09 m5732.69 , h t ep5742.69 D 5752.69 5762.69 107.0 5712.69 5722.09 m5732.69 , h t ep5742.69 D 5752.69 5762.69 1 d 5 d 10 d 20 d 30 d V=5 m³ V=15 m³ V=30 m³ V=45 m³ 112.0 117.0 122.0 Formation temperature, ºC 4 Conclusions


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Baozhi Pan, Ding Li, Gang Chen, Qincong Wang, Lixin Ma, Sihui Liu. Numerical simulation of wellbore and formation temperature fields in carbonate formations during drilling and shut-in in the presence of lost circulation, Petroleum Science, 2014, 293-299, DOI: 10.1007/s12182-014-0343-4