Foam Rheological Properties Versus Geothermal Gradient in Vertical Well Drilling
- Sinde Seydou (International University of Grand-Bassam)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 13-15 January, Dhahran, Kingdom of Saudi Arabia
- Publication Date
- Document Type
- Conference Paper
- 2020. International Petroleum Technology Conference
- Hole-Cleaning, Properties, Foam, Geothermal-gradient, Hydraulics
- 3 in the last 30 days
- 3 since 2007
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The objective of this paper is to present a more accurate hydraulic model that can be used to forecast and simulate the different rheological properties and hydraulic parameters during foam drilling in vertical wells. The emphasis is put on the response of various rheological and hydraulic parameters to the change of downhole temperature due to the variation of the geothermal gradients. The developed hydraulic model is based on published experimental results and analytical theories that take into account the real conditions of the well. The methods used in this paper are to graphically present plots of each hydraulic parameter versus the depth at different geothermal gradients to study and analyze the effects of temperature on the downhole parameters. The graphical plots are followed by detailed discussions illustrating various trends and profiles of the parameters in response to the effect of the temperature. Particular attentions are given to the trends that might look, at the beginning, paradoxical, but the explanation comes to justify their normality. The parameters involved in these explanations include pressure drop, foam velocity, quality, density, effective viscosity, flow power index, flow consistency index, Reynolds number and friction factor inside the drill string as well as in the annulus in addition to the cuttings concentration and distribution along the annular section. The results obtained from the developed hydraulic model confirmed the dependency of foam hydraulics on its rheology which, in its turn is influenced by the geothermal gradient and downhole temperature. The increase of the geothermal gradient, and hence the downhole temperature, increases foam velocity, quality, flow power index and Reynolds number, whereas it decreases foam pressure drop, density, effective viscosity, flow consistency index and friction factor for both string and annular flows. The increase of the geothermal gradient decreases the cuttings concentration in the well, particularly at the bottom and higher depths which is beneficial in term of good hole cleaning and adequate cuttings removal. Cuttings accumulation might take place at and near the surface due to the sharp reduction of the temperature during the annular upward flow. The novel of carrying out this work is the provision of a reliable hydraulic model for foam drilling in vertical wells that proved accurate when applied and tested on two real wells in the Middle-East with average errors less than 2.6 % and 11% for the two wells, respectively.
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