American Journal of Oil and Chemical Technologies: Volume 3. Issue 4. October 2015 Industrial And Mining Research Center – Cycle Science & Industry Comopany, Tehran, Iran Petrotex Library Archive American Journal of Oil and Chemical Technologies Journal Website: http://www.petrotex.us Effect of a Naturally Derived Deflocculant (Black Myrobalan) on Rheological Behavior of Heavy Drilling Fluids Jalal Neshat 1 , Erfan Hosseini 2 , Bahram Habibnia 3 1 Department of Petroleum Engineering, Ahwaz Faculty of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran. 2 Department of Petroleum Engineering, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran. 3 Department of Petroleum Engineering, Ahwaz Faculty of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran. Abstract: Drilling process is the most important part of exploitation of hydrocarbon reservoirs and accomplishment of drilling a well is determined by proper choice of the drilling fluid. The drilling fluid is related either directly or indirectly to almost every drilling problem. Improvement of drilling fluid properties therefore would have direct impact on drilling process. Replacing common additives by more efficient additives is an alternative to reach this goal. Plant based additives are suitable materials which have been studying by researchers in recent years with aim of improving drilling fluid properties. In this study effect of Black Myrobalan (also called Terminalia Chebula) extract on rheological behavior of a heavy weight mud were investigated experimentally. To do this different concentrations of a Black Myrobalan solution (0.2, 0.6, 1.2, and 3 Vol %) were added to salt saturated mud and its rheological properties, filtration volume along with density and pH were measured. Furthermore effect of time aging and hot rolling at 200 °F was assessed. It was observed that Black Myrobalan decreases rheology of mud and increases filtration volume without affecting mud weight at both after and before hot rolling. Among rheological parameters yield point decreased more than other parameters. Moreover, hot rolling decreased the rheological parameters of mud while time aging increased them contrarily. The optimum concentration of Black Myrobalan in order to decrease rheology of mud was 1.2 Vol %. It was also observed that pH of mud decreased by increasing Black Myrobalan concentration. summarily Black Myrobalan acted as a deflocculant at concentrations up to 1.2 Vol %. Keyword: Deflocculant, Black Myrobalan, Rheology, Aging, Hot rolling. 1. Introduction Drilling operation is the most important phase in the exploitation of hydrocarbon deposits. The success of drilling a well depends crucially on the proper choice of the drilling fluid used (Benyounes et al. 2010).The drilling fluid is related either directly or indirectly to almost every drilling problem. A properly designed drilling fluid should be able to perform some major functions to meet up with design objectives and prevent drilling problems (Annis and Smith, 1996). Functions of drilling fluid are: controlling formation pressure and maintaining wellbore stability, suspending cuttings and transporting them to surface, cooling and lubricating drill string, Transmission of hydraulic energy to tools and bit, formation evaluation, control corrosion, facilitate cementing and completion [Annis and Smith, 1996; Amoco Production Company, 1994). Drilling fluids are separated into three major classifications: pneumatic, oil based, and water based. Water based fluids are the most extensively used drilling fluids. They are generally easy to build, inexpensive to maintain, and can be formulated to overcome most drilling problems (Amoco Production
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American Journal of Oil and Chemical Technologies: Volume 3. Issue 4. October 2015
Industrial And Mining Research Center – Cycle Science & Industry Comopany, Tehran, Iran
Petrotex Library Archive
American Journal of Oil and Chemical Technologies
Journal Website: http://www.petrotex.us
Effect of a Naturally Derived Deflocculant (Black Myrobalan) on
Rheological Behavior of Heavy Drilling Fluids
Jalal Neshat1, Erfan Hosseini
2, Bahram Habibnia
3
1Department of Petroleum Engineering, Ahwaz Faculty of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran. 2Department of Petroleum Engineering, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran. 3Department of Petroleum Engineering, Ahwaz Faculty of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran.
Abstract:
Drilling process is the most important part of exploitation of hydrocarbon reservoirs and accomplishment of drilling a well is
determined by proper choice of the drilling fluid. The drilling fluid is related either directly or indirectly to almost every drilling
problem. Improvement of drilling fluid properties therefore would have direct impact on drilling process. Replacing common
additives by more efficient additives is an alternative to reach this goal. Plant based additives are suitable materials which have been
studying by researchers in recent years with aim of improving drilling fluid properties. In this study effect of Black Myrobalan (also
called Terminalia Chebula) extract on rheological behavior of a heavy weight mud were investigated experimentally. To do this
different concentrations of a Black Myrobalan solution (0.2, 0.6, 1.2, and 3 Vol %) were added to salt saturated mud and its
rheological properties, filtration volume along with density and pH were measured. Furthermore effect of time aging and hot rolling
at 200 °F was assessed. It was observed that Black Myrobalan decreases rheology of mud and increases filtration volume without
affecting mud weight at both after and before hot rolling. Among rheological parameters yield point decreased more than other
parameters. Moreover, hot rolling decreased the rheological parameters of mud while time aging increased them contrarily. The
optimum concentration of Black Myrobalan in order to decrease rheology of mud was 1.2 Vol %. It was also observed that pH of
mud decreased by increasing Black Myrobalan concentration. summarily Black Myrobalan acted as a deflocculant at concentrations
up to 1.2 Vol %.
Keyword: Deflocculant, Black Myrobalan, Rheology, Aging, Hot rolling.
1. Introduction Drilling operation is the most important phase in the exploitation of hydrocarbon deposits. The success of drilling a well depends
crucially on the proper choice of the drilling fluid used (Benyounes et al. 2010).The drilling fluid is related either directly or
indirectly to almost every drilling problem. A properly designed drilling fluid should be able to perform some major functions to
meet up with design objectives and prevent drilling problems (Annis and Smith, 1996). Functions of drilling fluid are: controlling
formation pressure and maintaining wellbore stability, suspending cuttings and transporting them to surface, cooling and lubricating
drill string, Transmission of hydraulic energy to tools and bit, formation evaluation, control corrosion, facilitate cementing and
completion [Annis and Smith, 1996; Amoco Production Company, 1994). Drilling fluids are separated into three major
classifications: pneumatic, oil based, and water based. Water based fluids are the most extensively used drilling fluids. They are
generally easy to build, inexpensive to maintain, and can be formulated to overcome most drilling problems (Amoco Production