Study of shale-fluid interactions using thermogravimetry

Corrêa, Caio Cezar Dias; Nascimento, Regina Sandra Veiga

doi:10.1007/s10973-005-0052-8

Cited by 11 publications

(6 citation statements)

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“…Considering the forces on every clay particle, during dynamic filtration, under the condition of low Reynolds number, only particles with radius less than R  can precipitate onto the mud cake surface. A(1-C )γ 3ρ (5) where s ρ refers to the density of solid phase; f ρ refers to the density of liquid phase; m C refers to the volume percentage of liquid in drilling fluid; A is the filtration area; n is a constant to describe the flow performance of the fluid; q is the rate of the dynamic filtration. m γ is the shear rate on the surface of the mud cake.…”

Section: The Mechanism Of the Generation Of Mud Cakementioning

confidence: 99%

“…Shale is rich in hydrophilic clay minerals (illite, montmorillonite), excellent nanopores, and has a large specific surface area [4]. Shale is easily hydrated, which results in the expansion and dispersion of clay minerals and eventually leads to the collapsing of the shale [5,6]. Currently, based on the adsorption mechanism of hydration intercalation of clay lattice, various types of small molecular surface hydration inhibitors have been developed for water-based drilling fluid [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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An Investigation on the Function of Mud Cakes on the Inhibition of Low Molecular Inhibitor for Water-Based Drilling Fluids

Dong

2019

Energies

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The major low molecular inhibitors showed inhibition in the hydration of clay in the laboratory for water-based drilling fluids, according to the principle of intercalation adsorption. However, inhibitors have failed and caused serious engineering accidents in drilling oil and natural gas. This paper investigated the transmission of several of drilling fluids to indicate whether low molecular inhibitor for drilling can effectively inhibit the wellbore hydration. The inhibition of drilling fluid with the plugging of mud cakes, was significantly weakened based on the hydration expansion of cores and cutting recoveries. The residual contents of inhibitors were determined with the precolumn derivation of high-performance liquid chromatography (HPLC) analysis and were chartered with Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) analysis in the structure of the derivative. The clogging behavior of the mud cake was described by environmental scanning electron microscopy (ESEM). Experiments show that 40 wt% to 90 wt% by weight of the corrosion inhibitor cannot pass through the mud cake in the dynamic filtration of the drilling fluid. The mud cake can be further divided into a nanostructure layer, a homogeneous layer and an anisotropic layer with different permeability. Most inhibitors should be limited to the nanostructure layer and the homogeneous layer.

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Section: The Mechanism Of the Generation Of Mud Cakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation on the Function of Mud Cakes on the Inhibition of Low Molecular Inhibitor for Water-Based Drilling Fluids

Dong

2019

Energies

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“…In case of rocks which are drilled from the borehole, obtaining such large samples is very difficult; therefore, an attempt was made to determine the rock absorption on small samples, using the TG analysis. This analytical method was also used by Corrêa and Nascimneto [2] for shale-fluid interactions, regarding drilling fluids influence on wellbore stability.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetry as a tool for measuring of fracturing fluid absorption in shales

Labus

2018

J Therm Anal Calorim

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Water-based fracturing fluids are used for gas shale stimulations. The fluids are pumped under pressure into the well to create conductive fractures in hydrocarbon-bearing zones. The chemical additives vary depending on the geological and technical conditions of the well. One of the requirements of good fluid coherence is its low absorbency relative to the formation rock. Standard water absorption tests for rocks are usually performed on cubic samples (50 9 50 9 50 mm) soaked in water. In case of rocks which are drilled from the borehole, obtaining such large samples is very difficult; therefore, an attempt was made to determine the rock absorption on small samples, using the TG analysis. Thermogravimetric (TG/DTG) experiments were conducted in temperature range 40-300°C in synthetic air environment. Shale rock samples were soaked in water and fracturing fluid. The absorption of the rocks is related to the shale's mineral composition, which was also determined by thermal analysis (TG/DSC).

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“…About 75 % of the side walls of oil and gas wellbores consist of shale and mud rocks, which are responsible for 90 % of the wellbore instability problems (Corrêa and Nascimento 2005;Jiang et al 2014;Wang et al 2012a, b;Huang et al 2007). Several types of shales with a significant amount of clay minerals are very reactive once they come into contact with water, and they can cause serious wellbore instability during drilling, like hole shrinkage and hole sloughing and caving (Hisham 2006;Wang et al 2012a, b;Zhang et al 2013a, b).…”

Section: Introductionmentioning

confidence: 99%

“…Wellbore stability has been studied for a long time using mainly two quite different approaches. Some authors consider the problem exclusively from the point of view of rock mechanics and others from the point of view of chemical interactions between shales and fluids (Wu et al 1993;Corrêa and Nascimento 2005). Based on the second approach, a variety of water-based drilling fluids and non-aqueous fluids have been applied; meanwhile, many types of wellbore stabilizers have been developed.…”

Section: Introductionmentioning

confidence: 99%

Development and evaluation of an electropositive wellbore stabilizer with flexible adaptability for drilling strongly hydratable shales

et al. 2015

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In order to overcome serious instability problems in hydratable shale formations, a novel electropositive wellbore stabilizer (EPWS) was prepared by a new approach. It has good colloidal stability, particle size distribution, compatibility, sealing property, and flexible adaptability. A variety of methods including measurements of particle size, Zeta potential, colloidal stability, contact angle, shale stability index, shale dispersion, shale swelling, and plugging experiments were adopted to characterize the EPWS and evaluate its anti-sloughing capacity and flexible adaptability. Results show that the EPWS has advantages over the conventional wellbore stabilizer (ZX-3) in particle size distribution, colloidal stability, inhibition, compatibility, and flexible adaptability. The EPWS with an average particle size of 507 nm and an average Zeta potential of 54 mV could be stable for 147 days and be compatible with salt tolerant or positive charged additives, and it also exhibited preferable anti-sloughing performance to hydratable shales at 77, 100, and 120°C, and better compatibility with sodium bentonite than ZX-3 and KCl. The EPWS can plug micro-fractures and pores by forming a tight external mud cake and an internal sealing belt to retard pressure transmission and prevent filtrate invasion, enhancing hydrophobicity of shale surfaces by adsorption to inhibit hydration. The EPWS with flexible adaptability to temperature for inhibition and sealing capacity is available for long open-hole sections during drilling.

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Study of shale-fluid interactions using thermogravimetry

Cited by 11 publications

References 0 publications

An Investigation on the Function of Mud Cakes on the Inhibition of Low Molecular Inhibitor for Water-Based Drilling Fluids

An Investigation on the Function of Mud Cakes on the Inhibition of Low Molecular Inhibitor for Water-Based Drilling Fluids

Thermogravimetry as a tool for measuring of fracturing fluid absorption in shales

Development and evaluation of an electropositive wellbore stabilizer with flexible adaptability for drilling strongly hydratable shales

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