A comprehensive empirical, analytical and tomographic investigation on rheology and formation damage behavior of a novel nano-modified invert emulsion drilling fluid

Hajiabadi, Seyed Hasan; Aghaei, Hamed; Kalateh-Aghamohammadi, Mina; Sanati, Ali; Kazemi‐Beydokhti, Amin; Esmaeilzadeh, Feridun

doi:10.1016/j.petrol.2019.106257

Cited by 28 publications

(14 citation statements)

References 23 publications

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“…Было найдено существенное изменение всех реологических параметров, а также снижение потерь бурового раствора в зависимости от концентрации наноматериалов в растворе. В исследовании [113] выявили значительное улучшение реологического поведения буровых растворов с инверсной эмульсией полиэтиленгликоль-МУНТ. Также было обнаружено, что эти углеродные наноструктуры имеют большой потенциал для устранения проблем, связанных с повреждением пласта.…”

Section: рис3 типы углеродных наноматериаловunclassified

Potential applications of carbon nanomaterials in oil recovery

Shamilov¹,

Socar²

2020

SOCAR Proceedings

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Carbon nanomaterials and compositions containing them are attracting increased attention. The high variety of carbon nanomaterials structures and morphologies as well as the simplicity of its surface functionalization, make it possible to effectively select the nanomaterial properties for the target task. The presented study provides an overview of the oil industry stages and shows the main directions of using nanotechnology in them. The main attention is focused on the trends of carbon nanomaterials (nanodiamonds, carbon nanotubes and graphene-like materials) applications in the petroleum extraction stage (drilling and enhanced oil recovery processes).

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Section: рис3 типы углеродных наноматериаловunclassified

Potential applications of carbon nanomaterials in oil recovery

Shamilov¹,

Socar²

2020

SOCAR Proceedings

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“…In some cases, in which the formation rock is very sensitive to water, oil-based drilling fluids prevent the formation damage and wellbore stability issues. Different types of oil-based drilling fluids are used to drill sensitive formations, such as invert-emulsion drilling fluid [ 20 ]. The filter cake removal in oil-based drilling fluids is different than that in the case of water-based because of the difference in the composition of the filter cake.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Breakdown Pressure by Filter Cake Removal Using Thermochemical Fluids and Solvents: Experimental and Numerical Studies

et al. 2021

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The process of well cleanup involves the removal of an impermeable layer of filter cake from the face of the formation. The inefficient removal of the filter cake imposes difficulty on fracturing operations. Filter cake’s impermeable features increase the required pressure to fracture the formation. In this study, a novel method is introduced to reduce the required breakdown pressure to fracture the formation containing the water-based drilling fluid filter cake. The breakdown pressure was tested for five samples of similar properties using different solutions. A simulated borehole was drilled in the core samples. An impermeable filter cake using barite-weighted drilling fluid was built on the face of the drilled hole of each sample. The breakdown pressure for the virgin sample without damage (filter cake) was 6.9 MPa. The breakdown pressure increased to 26.7 MPa after the formation of an impermeable filter cake. Partial removal of filter cake by chelating agent reduced the breakdown pressure to 17.9 MPa. Complete dissolution of the filter cake with chelating agents resulted in the breakdown pressure approximately equivalent to the virgin rock breakdown pressure, i.e., 6.8 MPa. The combined thermochemical and chelating agent solution removed the filter cake and reduced the breakdown pressure to 3.8 MPa. Post-treatment analysis was carried out using nuclear magnetic resonance (NMR) and scratch test. NMR showed the pore size redistributions with good communication between different pores after the thermochemical removal of filter cake. At the same time, there was no communication between the different pores due to permeability impairment after filter cake formation. The diffusion coupling through NMR scans confirmed the higher interconnectivity between different pores systems after the combined thermochemical and chelating agent treatment. Compressive strength was measured from the scratch test, confirming that filter cake formation caused added strength to the rock that impacts the rock breakdown pressure. The average compressive strength of the original specimen was 44.5 MPa that increased to 73.5 MPa after the formation of filter cake. When the filter cake was partially removed, the strength was reduced to 61.7 MPa. Complete removal with chelating agents removed the extra strength that was added due to the filter cake presence. Thermochemical and chelating agents resulted in a significantly lower compressive strength of 25.3 MPa. A numerical model was created to observe the reduction in breakdown pressure due to the thermochemical treatment of the filter cake. The result presented in this study showed the engineering applications of thermochemical treatment for filter cake removal.

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“…A detailed examination of the damages caused by drilling fluid requires employing microscale and nanoscale imaging and visualization techniques such as micro-CT, microfluidics, and SEM. A medical CT scanner was used by Hajiabadi et al (2019) to study the depth of the invasion of nanomodified drilling fluids. 23 But the spatial resolution of medical CT scanners is on the order of millimeters which is insufficient to observe pore-scale events.…”

Section: ■ Introductionmentioning

confidence: 99%

“…A medical CT scanner was used by Hajiabadi et al (2019) to study the depth of the invasion of nanomodified drilling fluids. 23 But the spatial resolution of medical CT scanners is on the order of millimeters which is insufficient to observe pore-scale events. Micromodels have been used to study different types of FD in several studies.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nanoparticles (NPs) are one of the materials used that have a high specific surface area due to their very small size which significantly increases their effectiveness for improving the properties of the drilling fluid. Many studies have been conducted to improve the properties of water-based drilling fluids by different types of NPs, − among which the use of silica NPs is of great interest because of their high performance in rectifying many of the problems encountered in drilling operations. Studies show that silica NPs can greatly improve the rheological properties of the drilling fluid (pumpability, cutting transport capacity, and required energy for flow) and reduce the filtration volume and thickness of the mudcake. − When the thickness of the mudcake decreases, the pipe sticking occurrence goes extremely down .…”

Section: Introductionmentioning

confidence: 99%

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Insights into the Pore-Scale Mechanisms of Formation Damage Induced by Drilling Fluid and Its Control by Silica Nanoparticles

Mohammadi

Mahani

2020

Energy Fuels

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The formation damage (FD) caused by the invasion of drilling fluid severely affects reservoir performance during production. Most of the published research studies which address this type of FD have been carried out at the core or field scale. Thus, the main aim of the paper is to investigate the pore-scale mechanisms of FD induced by drilling fluids and their control with silica nanoparticles (NPs) using a microfluidic approach. The proper identification of the mechanisms of FD can lead to the proper selection of NP type and concentration as well as a suitable method to remediate FD. The micromodel was designed in a way to closely simulate the cross-flow at the wellbore surface. A water-based drilling fluid was prepared at low-and high-pH values of 9 and 10.7, respectively. The drilling fluid was augmented with silica NPs at different concentrations to study its impact on FD remediation. The drilling fluid was injected into an initially oil-saturated micromodel. Thereafter hydrochloric acid was injected as a cleanup fluid. Lastly, oil was flowed back into the micromodel from the opposite side to simulate the back production. The study was complemented with cutting transport simulation and measurement of filtration and bulk rheological properties of the drilling fluid. The pore-scale observations reveal three types of FD associated with the drilling fluid invasion: (1) primary, (2) secondary, and (3) tertiary. The type of FD was found to be dependent on the mud pH, necessitating the use of different NP concentrations. Primary FD is caused immediately after drilling fluid invasion into the porous medium and includes the internal mudcake deposition (with both low-and high-pH muds) and water blockage (mainly with high-pH mud). After acid cleaning and oil flow-back, the secondary FD is induced which includes in situ acid-in-oil emulsion formation within the pore structure of the mudcake (with both low-and high-pH muds) as well as on the micromodel surface (mainly with high-pH mud). The tertiary FD originates from the relocation and trapping of mobile emulsions. It was also found that, in the case of primary FD, the NPs reduce the penetration depth of the drilling fluid into the micromodel through external (or face) and internal plugging mechanisms. Moreover, NPs eliminate the water blockage by reducing the mud infiltrate volume as well as reducing the IFT. For the case of secondary FD, NPs do not allow the formation of acid-in-oil emulsions within the internal mudcake due to increased drilling fluid stability. In addition to reducing the infiltrate volume, NPs prevent the formation of emulsions on the pore surface by altering the wettability of the micromodel to a more water-wetting state. By reducing the primary and secondary FD, the tertiary FD is eliminated too. The findings from the micromodel experiments highlight the importance of optimizing the NP concentration based on both attaining an efficient cutting transport in the well and ensuring low mud invasion into the porous medium.

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A comprehensive empirical, analytical and tomographic investigation on rheology and formation damage behavior of a novel nano-modified invert emulsion drilling fluid

Cited by 28 publications

References 23 publications

Potential applications of carbon nanomaterials in oil recovery

Potential applications of carbon nanomaterials in oil recovery

Reduction of Breakdown Pressure by Filter Cake Removal Using Thermochemical Fluids and Solvents: Experimental and Numerical Studies

Insights into the Pore-Scale Mechanisms of Formation Damage Induced by Drilling Fluid and Its Control by Silica Nanoparticles

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