Real-Time Prediction of Plastic Viscosity and Apparent Viscosity for Oil-Based Drilling Fluids Using a Committee Machine with Intelligent Systems

Abstract In deepwater drilling, the rheology of traditional drilling fluid is uncontrollable since the fluid usually mixes with brine and encounters low temperature. A solution may be to use the newly designed brine-based fuzzy-ball drilling fluids (BFDFs) since these have a well-adapted rheology under high salinity and low temperature condition. This has the potential to make drilling safer and more efficient. In this experiment, the rheological properties of BFDFs under test conditions were characterized with a rheometer by varying salinity (2 to 20 mass%) and temperature (4 to 80 °C). The rheological parameters considered are apparent viscosity (AV), plastic viscosity (PV), yield point (YP), and θ6 reading. To characterize the magnitudes of changes of the rheological parameters and their low temperature dependence, their ratios at 4 and 25 °C, and 4 and 80 °C were calculated. The results showed that the apparent viscosity (AV), the plastic viscosity (PV), the yield point (YP), and θ6 reading of BFDFs increased slightly with the decrease of salinity and temperature. The ratios of rheological parameters at 4 and 25 °C were close to unity, while the ratios at 4 and 80 °C were about two. The flow behavior of BFDFs under high salinity and low temperature condition was stable. Therefore, brine could be used as the base fluid for BFDFs. Theoretically, the flow behavior of BFDFs under low temperature condition seems to follow the Herschel-Bulkley model. Practically, the tests indicated that the BFDFs possess a strong tolerance to sandstone cuttings and Cabentonite, an excellent inhibitive property to shaly cuttings, weak corrosive characteristics against N80 casing steel, excellent lubricity properties, and remarkable biodegradability. In summary, the empirical results showed that the newly designed fuzzy-ball working fluid can use brine instead of fresh water as based fluid and maintain remarkable properties under high salinity and low temperature condition. Properties of BFDFs could basically satisfy the requirement of deepwater drilling work.

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Artificial Neural Network Modeling of Plastic Viscosity, Yield Point, and Apparent Viscosity for Water-Based Drilling Fluids

Journal of Dispersion Science and Technology ◽

10.1080/01932691.2012.704746 ◽

2013 ◽

Vol 34 (6) ◽

pp. 822-827 ◽

Cited By ~ 12

Author(s):

Meisam Mirarab Razi ◽

Mohammad Mazidi ◽

Fatemeh Mirarab Razi ◽

Hamed Aligolzadeh ◽

Shahram Niazi

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Yield Point ◽

Apparent Viscosity ◽

Network Modeling ◽

Plastic Viscosity ◽

Neural Network Modeling ◽

Drilling Fluids ◽

Artificial Neural Network Modeling ◽

Water Based

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Effect of carboxymethylcellulose on the rheological and filtration properties of bentonite clay samples determined by experimental planning and statistical analysis

Cerâmica ◽

10.1590/0366-69132018643702332 ◽

2018 ◽

Vol 64 (370) ◽

pp. 254-265 ◽

Cited By ~ 1

Author(s):

B. M. A. Brito ◽

P. M. Bastos ◽

A. J. A. Gama ◽

J. M. Cartaxo ◽

G. A. Neves ◽

...

Keyword(s):

Molecular Weight ◽

Statistical Analysis ◽

Rheological Properties ◽

Apparent Viscosity ◽

Bentonite Clay ◽

Plastic Viscosity ◽

Drilling Fluids ◽

Experimental Planning ◽

Water Based ◽

Filtration Properties

Abstract Over the past few years, considerable research has been conducted using the techniques of mixture delineation and statistical modeling. Through this methodology, applications in various technological fields have been found/optimized, especially in clay technology, leading to greater efficiency and reliability. This work studied the influence of carboxymethylcellulose on the rheological and filtration properties of bentonite dispersions to be applied in water-based drilling fluids using experimental planning and statistical analysis for clay mixtures. The dispersions were prepared according to Petrobras standard EP-1EP-00011-A, which deals with the testing of water-based drilling fluid viscosifiers for oil prospecting. The clay mixtures were transformed into sodic compounds, and carboxymethylcellulose additives of high and low molar mass were added, in order to improve their rheology and filtrate volume. Experimental planning and statistical analysis were used to verify the effect. The regression models were calculated for the relation between the compositions and the following rheological properties: apparent viscosity, plastic viscosity, and filtrate volume. The significance and validity of the models were confirmed. The results showed that the 3D response surfaces of the compositions with high molecular weight carboxymethylcellulose added were the ones that most contributed to the rise in apparent viscosity and plastic viscosity, and that those with low molecular weight were the ones that most helped in the reduction of the filtrate volume. Another important observation is that the experimental planning and statistical analysis can be used as an important auxiliary tool to optimize the rheological properties and filtrate volume of bentonite clay dispersions for use in drilling fluids when carboxymethylcellulose is added.

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Real time prediction of suspended solids in drilling fluids

Journal of Natural Gas Science and Engineering ◽

10.1016/j.jngse.2016.02.001 ◽

2016 ◽

Vol 30 ◽

pp. 164-175 ◽

Cited By ~ 4

Author(s):

S.C. Magalhães ◽

C.M. Scheid ◽

L.A. Calçada ◽

L.M.M. Lutterbach ◽

R.S. Rezende ◽

...

Keyword(s):

Real Time ◽

Suspended Solids ◽

Drilling Fluids ◽

Time Prediction

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Rheological Properties of Water-Based Drilling Fluids in Deep Offshore Conditions

Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology ◽

10.1115/omae2019-96719 ◽

2019 ◽

Author(s):

Qian Ding ◽

Baojiang Sun ◽

Zhiyuan Wang ◽

Yonghai Gao ◽

Yu Gao ◽

...

Keyword(s):

High Pressure ◽

High Temperature ◽

Low Temperature ◽

Rheological Properties ◽

Apparent Viscosity ◽

Drilling Fluid ◽

Plastic Viscosity ◽

Drilling Fluids ◽

Water Based ◽

Temperature And Pressure

Abstract In deep-water drilling, the drilling fluid is affected by the alternating temperature field derived from the low temperature of the seawater and the high temperature of the formation. The complicated wellbore temperature and pressure environments make the prediction of rheological properties of the drilling fluid difficult. In this study, the rheological properties of water-based drilling fluid in full temperature and pressure range of deep-water conditions were tested from 2 to 150 °C (35.6 to 302 °F) and 0.1 to 70 MPa (14.5 to 10000psi). The experiment was carried out by the OFI130-77 high temperature and high pressure rheometer. The experimental data were processed by multiple regression analysis method, and the mathematical model for predicting the apparent viscosity, plastic viscosity and yield point of water-based drilling fluid under high temperature and high pressure conditions was established. The experimental results show that when the temperature is lower than 65 °C (149 °F), the apparent viscosity and plastic viscosity of the water-based drilling fluid decrease significantly with increasing temperature. When the temperature is higher than 65 °C (149 °F), the apparent viscosity and plastic viscosity decrease slowly. Under low temperature conditions, the effect of pressure on the apparent viscosity and plastic viscosity of water-based drilling fluids is relatively significant. The calculated values of the prediction model have a good agreement with the experimental measurements. Compared with the traditional model, this prediction model has a significant improvement in the prediction accuracy in the low temperature section, which can provide a calculation basis for on-site application of deepwater drilling fluid.

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