Bottom circulating hole temperature

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It is possible for the bottom hole circulating temperature to be higher than bottom hole static temperature? The reason that the circulating temperature is higher is because the pressure drop along the drill string during circulation is dissipated as heat energy to increase the temperature. The use of synthetic oil-based mud is also more likely to result in higher bottom hole circulating temperature compared water-based mud as the specific heat for base oil is significantly lower than water i. In addition, water-based mud typically has lower plastic viscosity PV value which reduces the drill string pressure drop, i. It will also result in higher flow line temperature. In some situations, mud cooler is necessary to cool down the flow line temperature.
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bottomhole circulating temperature | Oilfield Glossary

Significant change of wellbore and surrounding formation temperatures during the whole drilling process for oil and gas resources often leads by annulus fluid fluxes into formation and may pose a threat to operational security of drilling and completion process. Based on energy exchange mechanisms of wellbore and formation systems during circulation and shut-in stages under lost circulation conditions, a set of partial differential equations were developed to account for the transient heat exchange process between wellbore and formation. A finite difference method was used to solve the transient heat transfer models, which enables the wellbore and formation temperature profiles to be accurately predicted. Moreover, heat exchange generated by heat convection due to circulation losses to the rock surrounding a well was also considered in the mathematical model. The results indicated that the lost circulation zone and the casing programme had significant effects on the temperature distributions of wellbore and formation.
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The temperature of the circulating fluid air, mud , cement , or water at the bottom of the wellbore after several hours of circulation. This temperature is lower than the bottomhole static temperature. Therefore, in extremely harsh environments, a component or fluid that would not ordinarily be suitable under bottomhole static conditions can be used with great care in circulating conditions. Similarly, a high-temperature well can be cooled down in an attempt to allow logging tools to function. The BHCT is also important in the design of operations to cement casing because the setting time for cement is temperature-dependent.
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Tragesser, A. A method has been developed to calculate wellbore temperatures during Mud circulation and the actual cementing operation to aid in the design of cement slurries. The method agrees within 10F with previously measured values.
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