Токсанбаев Д. Application of nanotechnology based drilling fluids // Science Time. 2023. № 7(114). С. 33-38.

Статья: Токсанбаев Д. 2023-07.pdf

Полный выпуск: Science Time. Выпуск № 7 (2023).pdf

APPLICATION OF NANOTECHNOLOGY BASED DRILLING FLUIDS

Toxanbayev Darkhan,
Oil and gas industry engineer,
Aktau, Kazakhstan

E-mail: sarsenbaydarhan@gmail.com

Abstract. Drilling fluids are an integral component of the well drilling process, performing many critical functions, including cooling and lubricating the drilling tool, transporting cuttings to the surface, maintaining reservoir pressure and preventing wellbore collapse. In the last decade, the introduction of nanotechnology into the composition of drilling fluids has made it possible to dramatically improve their performance characteristics and expand the possibilities of application in complex geological conditions.

This article provides a comprehensive analysis of modern nanomodified drilling fluids, considers their key advantages compared to traditional compositions, and assesses the prospects for further development in this area. Particular attention is paid to innovative nanomaterials, such as nanoclays, nanometal oxides and carbon nanostructures, which can significantly improve the stability, rheological and filtration properties of solutions.

The results of numerous laboratory studies and industrial tests are presented, clearly confirming the high efficiency of nanotechnological solutions in various drilling conditions. The economic and environmental aspects of using nanomodified drilling fluids, as well as the main challenges associated with their widespread implementation in the oil and gas industry, are analyzed. The article is a systematic review of modern achievements in the field of nanotechnology as applied to drilling fluids, based on current scientific publications and practical experience up to 2023 inclusive. The material will be useful for drilling specialists, chemical engineers, as well as researchers working in the field of nanomaterials and oil and gas technologies.

Key words: drilling fluids, nanotechnology, nano-enhanced drilling fluids, nanoclay, metal oxide nanoparticles, carbon nanomaterials.

Introduction

Modern technologies for drilling oil and gas wells place ever higher demands on the characteristics of drilling fluids, especially when working in complex geological conditions – high temperatures and pressures, in salt-bearing and clay formations, when drilling long horizontal wells. Traditional water– or hydrocarbon-based drilling fluids often fail to cope with these challenges, which leads to numerous complications during the drilling process, increased well construction time and increased operating costs.

Nanotechnology offers fundamentally new solutions for upgrading drilling fluids, allowing to improve their stability, filtration and rheological properties to a qualitatively new level. Unique physical and chemical characteristics of nanomaterials, such as high specific surface area, quantum effects and exceptional mechanical strength, open up opportunities for creating "smart" drilling fluids with programmable properties.

The history of using nanotechnology in drilling fluids goes back more than two decades. The first studies in this area date back to the early 2000s, but a real breakthrough has occurred in the last decade due to the development of nanomaterial synthesis methods and a deeper understanding of the mechanisms of their interaction with drilling fluid components.

Modern research is focused on several key areas: the development of new-generation nanoclay systems, the use of metal nanooxides (aluminum, silicon, titanium), the use of carbon nanomaterials (nanotubes, graphene), and the creation of hybrid compositions with a synergistic effect. An important aspect is the development of environmentally friendly nanotechnological solutions that meet modern environmental standards.

The purpose of this article is to conduct a comprehensive analysis of modern achievements in the field of nanomodified drilling fluids, systematize the accumulated scientific and practical experience, assess the advantages and limitations of various approaches, and outline promising areas for further research. Particular attention is paid to the practical aspects of introducing nanotechnology into real drilling conditions at oil and gas fields.

Classification of nanomodified drilling fluids

Modern nanomodified drilling fluids can be classified by several criteria, the most important of which is the type of nanomaterials used. The first and most studied group consists of solutions based on nanoclays – layered aluminosilicates with a particle size of less than 100 nm. Of particular interest are modified forms of montmorillonite, which have exceptional swelling capacity and a high specific surface area (up to 800 m²/g).

These materials dramatically improve the rheological characteristics of solutions, increasing their structural viscosity and thixotropic properties. Studies show that adding only 1-2% nanoclays can increase the plastic viscosity index by 30-40% compared to traditional clay systems. In addition, nanoclays significantly increase the thermal stability of solutions, which is especially important when drilling deep wells with high formation temperatures. The second significant group consists of solutions with the addition of metal nanooxides, among which the most widely used are SiO₂, Al₂O₃ and TiO₂ nanoparticles. These materials have a unique ability to form spatial structures in the solution, which leads to a significant improvement in its filtration characteristics. For example, adding 0.5% nano silicon oxide can reduce water loss by 30-40% compared to traditional filtration inhibitors.

A special class is represented by carbon nanomaterials – nanotubes, graphene and their derivatives. Due to their exceptional mechanical strength and high thermal conductivity, these additives can simultaneously solve several problems: increase lubricating properties, improve heat transfer and increase the mechanical stability of the solution. Experimental data indicate that adding 0.1% carbon nanotubes can reduce the friction coefficient by 20-25%.

Hybrid systems that combine several types of nanoparticles to achieve a synergistic effect deserve special attention. For example, a combination of nanoclays with nanometal oxides demonstrates improved rheological and filtration properties compared to systems containing only one type of nanoparticle. Such multicomponent systems are of particular interest for the creation of adaptive drilling fluids capable of changing their properties depending on drilling conditions.

Fig. 1

Advantages of nanotechnology in drilling fluids

The introduction of nanotechnology into the composition of drilling fluids provides a number of significant advantages over traditional systems. The most significant is the dramatic improvement in rheological characteristics – nanomodified solutions demonstrate exceptional stability over a wide range of temperatures and pressures, maintaining optimal viscosity and shear stress values ​​for a long time.

This property is especially important when drilling complex wells, where traditional solutions often lose stability, leading to complications. Laboratory studies show that the addition of nanoparticles can increase the service life of the solution by 1.5-2 times, which directly affects the cost-effectiveness of the drilling process.

The second key advantage is a significant improvement in filtration characteristics. Nanomaterials are capable of forming an ultra-thin (several nanometers thick), but extremely strong filtration cake on the well walls, effectively preventing liquid from penetrating into the formation. This not only reduces drilling fluid losses, but also minimizes the filtrate penetration zone, which is especially important when drilling in productive horizons.

The third important advantage is a significant improvement in lubricating properties. Nanoparticles, especially carbon materials and some metal oxides, are able to create protective layers on the contact surface that reduce friction by 20-30%. This leads to a decrease in the torque of the drill string, a decrease in energy costs and an increase in the service life of drilling equipment.

The environmental aspect of using nanotechnology also deserves special attention. Many nanomaterials make it possible to replace traditional, but environmentally hazardous components of drilling fluids (for example, chromates or lead compounds) with safer analogues. In addition, some nanoparticles have biocidal properties, which reduces the use of toxic bactericides.

Finally, nanomodified solutions demonstrate exceptional resistance to extreme conditions – high temperatures (up to 200 ° C and above), pressures and aggressive environments. This opens up new possibilities for drilling in complex geological conditions where traditional solutions prove ineffective.

Fig. 2

Practical results and industrial application

Numerous laboratory studies clearly confirm the high efficiency of nanomodified drilling fluids. Systematic tests conducted in 2020-2023 demonstrate impressive results: the addition of 0.5% nanoaluminum oxide reduces water loss by 25-30%, the introduction of carbon nanotubes increases thermal conductivity by 15-20%, and the use of nanoclays increases structural strength by 1.5-2 times.

Industrial tests conducted at fields in the Perm Territory and Western Siberia have shown that the use of nanoclay solutions can reduce drilling time by 10-12% due to improved rheological properties and a decrease in the frequency of complications. In particular, a decrease in the number of drilling tool sticking and cases of wellbore wall collapse was noted.

Particularly impressive results were obtained when drilling horizontal wells with a large departure from the vertical. Nanomodified solutions have demonstrated exceptional stability during slurry transportation, which has increased the drilling rate by 15-20% compared to traditional systems. However, the implementation of such solutions faces a number of serious challenges. The main limitations are the high cost of some nanomaterials (especially carbon nanotubes and graphene), difficulties in scaling up synthesis technologies for industrial volumes, and the need to develop individual formulations for specific geological conditions. In addition, the issue of long-term stability of nanoparticles in drilling fluids under cyclic temperature and mechanical influences remains open. Some studies indicate possible aggregation of nanoparticles during long-term operation, which requires additional research and development of special stabilizers.

Development Prospects

Further development of nanomodified drilling fluids is associated with several promising areas. One of the most relevant is the development of cheaper and more accessible nanomaterials, which will reduce the cost of technologies and accelerate their widespread implementation. Particular hopes are associated with the creation of hybrid nanostructures based on natural materials.

The second important area is the development of "smart" or adaptive drilling fluids that can change their properties in response to changing drilling conditions. For example, research is underway on temperature-sensitive polymers with nanoparticles that can reversibly change viscosity upon reaching certain temperature thresholds.

The third promising area is associated with the creation of environmentally friendly nanotechnological solutions. Of particular interest are biocompatible nanoparticles based on natural compounds, which could replace traditional, but environmentally hazardous components of drilling fluids without loss of efficiency.

Developments in the field of nanomaterials with multifunctional properties deserve special attention. For example, the creation of nanoparticles that combine the functions of a rheological modifier, corrosion inhibitor and bactericide could significantly simplify the composition of drilling fluids and reduce their cost. Finally, an important area is the development of computer modeling and artificial intelligence methods for predicting the properties of nanomodified solutions and optimizing their composition. This will reduce the time and costs of developing new formulations adapted to specific drilling conditions.

Conclusion

Nanomodified drilling fluids represent a qualitatively new stage in the development of drilling technologies, offering effective solutions for work in the most difficult geological conditions. As numerous studies and practical experience show, the introduction of nanotechnology can significantly improve the key characteristics of solutions – rheological, filtration, lubricating and thermal properties.

Despite the existing challenges associated with the high cost of some nanomaterials and the difficulties of scaling technologies, the advantages of nanomodified solutions are obvious. They allow not only to increase the efficiency of the drilling process, but also to reduce the environmental impact, which corresponds to modern trends in "green" technologies in the oil and gas industry.

Prospects for the development of this area are associated with the creation of more affordable nanomaterials, the development of adaptive ("smart") systems and the introduction of digital technologies for the design and optimization of compositions. Given the rapid development of nanotechnology in recent years, we can expect the emergence of fundamentally new solutions in this area in the near future. Thus, nanomodified drilling fluids are a promising direction that can radically change approaches to well construction in the 21st century. Their further development and implementation will contribute to increasing the efficiency and safety of drilling processes, as well as reducing the impact on the environment.

References:

1. Amanullah M., Al-Tahini A.M. (2009). Nano-Technology – Its Significance in Smart Fluid Development for Oil and Gas Field Application. SPE 126102, SPE Saudi Arabia Section Technical Symposium.

2. Hoelscher K.P. et al. (2012). Application of Nanoparticles in Drilling Fluids. SPE 157031, SPE International Oilfield Nanotechnology Conference.

3. Sensoy T. et al. (2009). Minimizing Water Invasion in Shale Using Nanoparticles. SPE 124429, SPE Annual Technical Conference and Exhibition.

4. Jung Y. et al. (2011). Improvement of Rheological Properties of Drilling Fluids Using Nanoparticles. Journal of Nanoscience and Nanotechnology, 11(1), 690-694.

5. Li M.C. et al. (2015). Cellulose Nanocrystals and Polyanionic Cellulose as Additives in Bentonite Water-Based Drilling Fluids. SPE 174068, SPE Annual Technical Conference and Exhibition.

6. Barry M.M. et al. (2015). Nanoparticle-Based Drilling Fluids for Minimizing Formation Damage in HP/HT Applications. SPE 173932, SPE International Symposium on Oilfield Chemistry.