Jitendra Sangwai

Heavy oil reservoirs are one of the largest remaining crude oil reserves in the world. Often, the inherent properties of heavy and extra-heavy oils cause major problems in production and transportation processes. The viscosity of these oils makes their treatment difficult with conventional means. Use of solvents to dissolve the heavy oils has been a traditional method to deal with these problems. Improvement in flow through solvent treatment can be further optimized through the use of nanoparticles. Literature works have suggested that nanoparticles have catalyzing effects which affect the polar species of heavy oils. This study is aimed at examining the effects of metallic nanoparticles in altering the viscous property of heavy fraction. Use of thermal stimulation in association with solvents are explored as a means to achieve viscosity reduction. These applications can be further extended into the areas of flow assurance.

Nanotechnology is a common word used by academia which is referred to the applied nanoscience conducted at nanoscale (1–100 nm) for variety of industrial applications. Application of nanotechnology in various fields is increasing extensively resulting in an enormous amount of publications in the distinct field. Nanoparticles (NPs) possess unique properties due to their larger surface area which leads to prolong application in multifold. Researchers working in enhanced oil recovery (EOR) areas are trying to get rid of challenges faced by the oil and gas companies for crude oil production. This chapter, therefore, focuses on work carried out by the researchers on chemical and rarely on thermal, gas injection, and biological EOR methods using NPs. Chemical enhanced oil is recovery (CEOR) methods taken into consideration due to their popularity in oilfields than the other existing methods. Viscosity, interfacial tension (IFT), and wettability are the major influencing factors for EOR. The authors intend to make the reader understand the pore-scale mechanism behind the enhanced oil recovery in the presence of NPs. In the early stage of enhanced oil recovery, it is essential to understand the properties of various NPs. Literature review reveals that properties of NPs mostly depend on methods they are prepared. Hence, at the beginning of the chapter, the types of NPs, preparation, and their characterization are explained briefly with the application of various nanoparticles in CEOR. Limitation of NPs application in chemical EOR area is spelled out clearly with the recommendation at the end.

Owing to the extinction of conventional reservoirs, it is imperative for engineers to find the unconventional oil and gas resources. Drilling an unconventional field requires engineered drilling fluids because an efficient drilling operation purely depends upon the performance of drilling fluid. Drilling fluid which is a combination of solids and fluids performs many functions, such as cooling the drill bit, cleaning the wellbore, maintaining the wellbore pressure and development of a filter cake to prevent the invasion of fluid into the formation. The drilling fluid can be classified into oil-based mud (OBM), water-based mud (WBM) and pneumatic fluid (or) air-based fluid. Conventional drilling fluids which are in use lose their efficacy during drilling a complex reservoir, like high temperature high pressure (HTHP) and highly saline reservoir. Nanomaterials which are unique due to their distinctive properties, like high surface to volume ratio, thermal stability and conductivity, found their application in almost all fields of engineering. Many studies have been conducted to analyse the enhancement of drilling fluids through the application of nanoparticles. The studies resulted in enhancement in rheological, filtration, thermal properties of the drilling mud and also improved the wellbore stability. This chapter elaborately discusses about how the application of various types of nanoparticles/nanocomposites helps to enhance the rheological and filtration properties of the drilling mud.