Analytical Model To Predict the Effect of Pipe Friction on Downhole Fluid Temperatures
- Aniket Kumar (Halliburton) | Robello Samuel (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2013
- Document Type
- Journal Paper
- 270 - 277
- 2013. Society of Petroleum Engineers
- 1.6.1 Drilling Operation Management, 1.6 Drilling Operations, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.11 Drilling Fluids and Materials, 1.10 Drilling Equipment, 1.12.1 Measurement While Drilling
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The advent of deviated, horizontal, and extended-reach drilling has led toincreased frictional forces acting between the drillstring and the wellborewall. Wellbore mechanical friction attributable to pipe rotation or to torqueand drag plays a significant role in drilling operations and is considered toinfluence the downhole temperatures of the drilling fluid. An analytical modelto estimate the influence of this pipe friction will help in providing a betterphysical insight to understand the downhole borehole conditions as well as inrealizing the effect of its underlying parameters. This study aims to develop asimple mathematical model to analyze the heat generated downhole from thedrillstring and borehole contact and then predict its influence on thetemperature of the drilling fluid during a drilling operation at any depth inthe well. The model presents a steady-state solution for heat transfer betweenthe drillstring and the fluids in the drillpipe and annulus, as well as forheat transfer between the annular fluid and the formation. The heat generatedfrom friction has been modeled by use of the torque acting on the drillstringas a result of contact forces. A linear temperature gradient for the formationand a constant borehole-wall temperature has been assumed to simplify themodel. Frictional pressure losses in the drillpipe, in the annulus, and acrossthe bit have been incorporated in the model because they contribute to the heatgenerated downhole. The temperature profile of the drilling fluid has beenestimated both in the annulus and inside the drillpipe for the entire wellprofile under consideration.
This paper will present the derivations of the generalized heattransfermodel and its validation by use of two practical drilling scenarios. Twodifferent field cases, one for a deviated well and the other for a horizontalwell, have been presented, and the estimated temperature profile by use of themodel is compared with the actual temperature measured downhole by use ofmeasurement- while-drilling (MWD) tools. The increase in temperature for aparticular depth in the well for the entire bit run has also been presented asanother successful application of this model. The impact of drilling parameterson temperatures has also been analyzed and can be used effectively to maintaina better check on undesired temperatures. This simple analytical model can besuitably applied to field cases on the basis of the well profile and can beeffectively used to predict the maximal temperatures to be encountered downholewhile drilling ahead as planned. An accurate estimation of maximal temperatureswill help us prevent severe downhole friction heating in the future.
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