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The effect of synthesis conditions of emulsifier on the properties of oil-based drilling muds

UDK: 622.24.063
DOI: 10.24887/0028-2448-2018-6-93-97
Key words: emulsifier, surfactant, fatty acid diethanolamides, oil-based mud, oil-in-water emulsion mud
Authors: V.A. Yanovsky (Tomsk State University, RF, Tomsk), A.D. Fenzel (Tomsk Polytechnic University, RF, Tomsk), M.O. Andropov (Tomsk State University, RF, Tomsk), R.S. Fakhrislamova (Tomsk State University, RF, Tomsk), A.S. Zakharov (Tomsk State University, RF, Tomsk), R.A. Churkin (Tomsk State University, RF, Tomsk), K.M. Minaev (Tomsk Polytechnic University, RF, Tomsk)

The present work is dedicated to the study of the effect of emulsifier synthesis parameters on the stability, rheological properties and fluid loss of oil-based drilling muds. The duration and temperature mode of direct amidation of fatty acids by diethanolamine are shown to have a marked impact on the composition of the products obtained, and, hence, the properties of drilling muds stabilized by these products. The dependencies of electrical stability of drilling muds on the time of emulsifier synthesis proceed through maximum point, while similar dependencies of structural-mechanical properties proceed through minimum points. Herein, for each synthesis temperature, the value of maximal electrical stability corresponds to position of minimum points of yield point and gel strength. An increase of the temperature of synthesis promotes increasing of electrical stability of drilling mud and reduction of its structural-mechanical (shear stress) properties. The ranges of optimal process duration are determined for three temperatures, i.e. 150 °С – 2-5 h, 170 °C – 1-2 h, and 190 °С – 30-60 min. Plastic viscosity, thixotropic properties and fluid loss of drilling mud are shown to be independent on the emulsifier synthesis conditions. It is also concluded that the degree of conversion of fatty acids and the amount of water formed during the synthesis cannot be considered the criteria for completion of the process.

References

1. Glushchenko V.N., Obratnye emul’sii i suspenzii v neftegazovoy promyshlennosti (Inverse emulsions and suspensions in the oil and gas industry), Moscow: Interkontakt Nauka Publ., 2008, 725 p.

2. Konesev V.G., Khomutov A.Yu., Application of oil-based drilling muds in reservoir rocks of Gazpromneft-Noyabrskneftegas JSC fields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 5, pp. 44–45.

3. Minaeva E.V., Nedel’ko E.S., Skotnov S.N. et al., Developing and implement high-weighted muds. Oil based drilling muds with a flat rheology profile for penetration of productive horizons with high pressures (In Russ.), Neft’. Gaz. Novatsii, 2014, no. 9 (188), pp. 30–33.

4. Yanovskiy V.A., Andropov M.O., Churkin R.A. et al., The effect of the chemical nature of emulsifiers of some fatty acid derivatives and ethanolamines on the oil-based drilling fluids properties (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 1, pp. 42–47.

5. Ibragimov N.G., Musabirov M.Kh., Dmitrieva A.Yu., Development of formulation of hydrophobic emulsion for selective acidizing of fractured-cavernous carbonate reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 11, pp. 129–131.

6. Yanovskiy V.A., Churkin R.A., Andropov M.O., Kosova N.I., Synthesis and study of properties of emulsifiers for reverse emulsions based on derivatives of acids of tall oil distillate and ethanolamines (In Russ.), Vestnik Tomskogo gos. universiteta, 2013, V. 370, pp. 194–199.

7. Yanovsky V.A., Andropov M.O., Fakhrislamova R.S. et al., Rheological properties of inverse emulsions stabilized by ethanolamides of tall oil fatty acids, MATEC Web Conf., 2016, V. 85, pp. 1–7.

8. Maag H., Fatty acid derivatives: important surfactants for household, cosmetic and industrial purposes, Journal of the American Oil Chemists’ Society, 1984, V. 61, no. 2, pp. 259–267.

The present work is dedicated to the study of the effect of emulsifier synthesis parameters on the stability, rheological properties and fluid loss of oil-based drilling muds. The duration and temperature mode of direct amidation of fatty acids by diethanolamine are shown to have a marked impact on the composition of the products obtained, and, hence, the properties of drilling muds stabilized by these products. The dependencies of electrical stability of drilling muds on the time of emulsifier synthesis proceed through maximum point, while similar dependencies of structural-mechanical properties proceed through minimum points. Herein, for each synthesis temperature, the value of maximal electrical stability corresponds to position of minimum points of yield point and gel strength. An increase of the temperature of synthesis promotes increasing of electrical stability of drilling mud and reduction of its structural-mechanical (shear stress) properties. The ranges of optimal process duration are determined for three temperatures, i.e. 150 °С – 2-5 h, 170 °C – 1-2 h, and 190 °С – 30-60 min. Plastic viscosity, thixotropic properties and fluid loss of drilling mud are shown to be independent on the emulsifier synthesis conditions. It is also concluded that the degree of conversion of fatty acids and the amount of water formed during the synthesis cannot be considered the criteria for completion of the process.

References

1. Glushchenko V.N., Obratnye emul’sii i suspenzii v neftegazovoy promyshlennosti (Inverse emulsions and suspensions in the oil and gas industry), Moscow: Interkontakt Nauka Publ., 2008, 725 p.

2. Konesev V.G., Khomutov A.Yu., Application of oil-based drilling muds in reservoir rocks of Gazpromneft-Noyabrskneftegas JSC fields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 5, pp. 44–45.

3. Minaeva E.V., Nedel’ko E.S., Skotnov S.N. et al., Developing and implement high-weighted muds. Oil based drilling muds with a flat rheology profile for penetration of productive horizons with high pressures (In Russ.), Neft’. Gaz. Novatsii, 2014, no. 9 (188), pp. 30–33.

4. Yanovskiy V.A., Andropov M.O., Churkin R.A. et al., The effect of the chemical nature of emulsifiers of some fatty acid derivatives and ethanolamines on the oil-based drilling fluids properties (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 1, pp. 42–47.

5. Ibragimov N.G., Musabirov M.Kh., Dmitrieva A.Yu., Development of formulation of hydrophobic emulsion for selective acidizing of fractured-cavernous carbonate reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 11, pp. 129–131.

6. Yanovskiy V.A., Churkin R.A., Andropov M.O., Kosova N.I., Synthesis and study of properties of emulsifiers for reverse emulsions based on derivatives of acids of tall oil distillate and ethanolamines (In Russ.), Vestnik Tomskogo gos. universiteta, 2013, V. 370, pp. 194–199.

7. Yanovsky V.A., Andropov M.O., Fakhrislamova R.S. et al., Rheological properties of inverse emulsions stabilized by ethanolamides of tall oil fatty acids, MATEC Web Conf., 2016, V. 85, pp. 1–7.

8. Maag H., Fatty acid derivatives: important surfactants for household, cosmetic and industrial purposes, Journal of the American Oil Chemists’ Society, 1984, V. 61, no. 2, pp. 259–267.


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