With the increased attention toward nanotechnology and their innovative use for different industries including but not limited to food, biomedical, electronics, materials, etc, the application of nanotechnology or nanoparticles in the oil and gas industry is a subject undergoing intense study by major oil companies, which is reflected through the huge amount of funds invested on the research and development, with respect to the nanotechnology. Nanotechnology has been recently investigated extensively for different applications in the oil and gas industry such as drilling fluids and enhanced oil recovery in addition to other applications including cementing and well stimulation. In this paper, comprehensive literature was conducted to review the different applications of nanotechnology in the oil and gas industry. A summary of all nanoparticles used along with a detailed analysis of their performance in improving the targeted parameters is comprehensively presented. The main objective of this review was to provide a comprehensive summary of the different successful applications of nanotechnology and its associated challenges, which could be very helpful for future researches and applications.
Lost circulation is a serious problem that imposes some extra costs to petroleum and gas exploration operations. Substantial technical and economic benefits can be accomplished if the severity and frequency of mud loss are considered during the well planning procedure. This will lead to preventing the occurrence of losses by using treatments/solutions that are applied before entering lost circulation zones. In the present work, new models were developed to predict the amount of lost circulation using artificial neural networks (ANNs). This model was implemented to obtain a deeper understanding of the relations between the losses rate and the controllable drilling variables (i.e., rate of penetration [ROP], flow rate [FR], circulation pressure [CP], weight on bit [WOB], and rotation per minute [RPM]). The losses rate was found to be sensitive to high ROP, FR, and CP, such that increasing these parameters continuously increase the amount of lost circulation. While a slight rise in the losses rate was observed at high WOB and RPM. The proposed ANNs model was used to predict the losses rate for two wells, and comparison plot (actual amount of lost circulation versus predicted) was introduced as a function of depth. An accurate and early prediction of lost circulation has been of great importance to avoid the risks associated with this problem's occurrence.
The term “clean agriculture” refers to a kind of farming that does not include synthetic inputs like fertilizers and pesticides. Various may think that the methods of clean agriculture are one method, but they have many ways, all of which come under the development of important natural systems. Bio and organic agriculture is an integral part of clean agriculture. Bio and organic agriculture rely on well-established scientific foundations related to the natural balance in the universe. They are preserving natural resources such as soil, water and air elements in the production of clean crops, in addition to several factors that must be combined and optimally utilized in protecting crops from various disease and insect infestations, as well as taking care of the environment and preserving it from pollution.
Zubair Formation consists of approximately 55% shale, which causes almost 70% of wellbore problems due to incompatibilities of drilling fluids and shale formations. The most common and effective solution to shale instability is through the design and selection of drilling fluids. Understanding the interaction between drilling fluids and shale has been a challenge due to the complexity of both physical and chemical variations in shale formations. This paper presents some of the important laboratory and well-site testing techniques that are often used by mud engineers for characterizing and remediating drilling fluids and shale interaction. Well-preserved shale samples were analyzed to describe the special characterization of the Zubair shale. Moreover, the traditional laboratory methods such as capillary suction time test, hot rolling dispersion test, bulk hardness test, and the linear swelling test were used to evaluate the stability of shale in the presence of test fluids. Our laboratory test results show that the Zubair shale is composed mainly of brittle mineral (quartz and calcite) with average content 51.46% and 43.54% of the clay mineral. In addition, the cation exchange capacity analysis and capillary suction time test indicated that Zubair shale has low to moderate reactivity with drilling fluids. This paper will present the preliminary process of analysis and understanding of shale structural failures due to shale/fluid interactions. Consequently, it can be used to control and minimize shale instability by improving the selection of chemical additives for clay inhibition.
Since electrostatic motors require very high voltages and do not exert great efforts on the usual dimensional scale, their design and optimization are not well known, but on the millimetre and micrometre scales, this kind of motor seems to present interesting qualities. The optimization of electrostatic micromotors is generally based on the use of numerical finite-element methods. Because of the numerous possible geometrical combinations, this type of optimization takes a lot of time and must be reperformed for each application. In this paper, we present the optimization of variable capacitance motors based solely on an analytical model of the stator - rotor capacity. For each application, this model allows determination of the optimal geometrical dimensions of the electrostatic micromotor depending on the fabrication process used.
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