Multiphase hydrodynamic analysis of pneumatic transportation ofdrill cuttings in air drilling

Adewumi, Michael A.; Tian, Suqing

doi:10.1016/0032-5910(93)80074-k

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…This makes it more difficult for WJD holes to discharge coal fragments. For the cuttings generated by a mechanical drill bit, there have been many studies to investigate the transportation of cuttings in the well and the effects of drilling parameters on cutting transportation, including pump rate, well dimensions, fluid properties, solid sizes, solid loading and well inclination [13][14][15][16][17][18]. However, the coal fragments generated from WJD are the results of coal fragmentation under multiple water jet impact.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Coal Fragmentation by High-Velocity Water Jet in Drilling: Size Distributions and Fractal Characteristics

Xiao

et al. 2018

Applied Sciences

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Water jet drilling (WJD) technology is a highly efficient method to extract coalbed methane from reservoirs with low permeability. It is crucial to efficiently remove the coal fragments while drilling. In this study, to disclose coal fragmentation features and size distributions under water jet impact in drilling, the image processing method was utilized to obtain the geometric dimensions of coal fragments. The size distributions, morphologies and fractal characteristics of coal fragmentation were studied based on generalized extreme value distribution and fractal theory. The effects of the jet impact velocity and coal strength on the fragmentation features were analyzed. The results show that fine particles dominate the coal fragments in WJD for coal seams with various strengths. In experiments conducted at the Fengchun coal mine, owing to the higher coal strength of the M7 coal seam, the fragmentation degree of coal subjected to water jets during WJD is lower in the M7 coal steam than in the M8 coal seam, which results in a large dominant fragment size and small fractal dimension under the same impact energy. It was found that the higher the jet impact velocity is, the higher the quantity of fragments generated from WJD and the smaller the particle size. The NUM-based cumulative probability distribution curves of coal fragments are more intensive in the range of relatively small particle sizes and then become sparser with the increase in particle size. When the impact velocity increases, (i) the size distribution curves move toward smaller particle sizes, and the dominant fragment size decreases; (ii) the shape (major axis/minor axis) of coal fragments move toward the upper left, and the curve shape for a high impact velocity attains unity more quickly; and (iii) the fractal dimension value increases linearly. In addition, the fractal dimensions are obviously affected by the dominant fragment size; they increase with the decrease in the dominant fragment size. This study can provide a basis for further research on coal fragment transportation in WJD and parameter selection for discharging coal fragments during drilling for CBM development.

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Section: Introductionmentioning

confidence: 99%

Investigation on Coal Fragmentation by High-Velocity Water Jet in Drilling: Size Distributions and Fractal Characteristics

Xiao

et al. 2018

Applied Sciences

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“…Sondaj çamurları değişen ortam koşulları göz önünde bulundurulduğunda, su bazlı, hava bazlı ve yağ bazlı olmak üzere üç ana gruba ayrılmaktadır. Su bazlı sondaj çamurları diğer çamur türleri ile kıyaslandığında daha ekonomik olup, sondaj operasyonlarının yaklaşık % 80'inde kullanılmaktadır [1][2][3][4]. Su bazlı sondaj çamurları; su, bentonit ve çeşitli katkı kimyasallarının belirli oranlarda birbiri ile karıştırılmasıyla elde edilir [5].…”

Section: Introductionunclassified

Al2O3 Nanopartikülleri İçeren Çok Duvarlı Karbon Nanotüpler Kullanılarak Su Bazlı Sondaj Çamurlarının Reolojik ve Filtrasyon Özelliklerinin Geliştirilmesinde Yenilikçi Bir Yaklaşım: Deneysel Araştırma

Özkan

Asker

Özkan

2020

Muş Alparslan Üniversitesi Fen Bilimleri Dergisi

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Sondaj çamuru kuyu tabanın temizlenmesi, yüksek basınçlı formasyonları kontrol etme, korozyona karşı koruma gibi önemli görevleri yerine getiren hayati derece öneme sahip bir akışkandır. Bu çalışmada Al 2 O 3 NP/ÇDKNT; kimyasal buhar biriktirme (CVD) yöntemi ile üretilmiş, X-Işını Fotoelektron Spektroskopisi (XPS) ve Geçirimli Elektron Mikroskobu (TEM) ile karakterize edilmiş, ardından su bazlı sondaj çamurlarına farklı oranlarda (0.001 -0.01% k/h) eklenmiştir. Hazırlanan sondaj çamurlarının plastik viskozitesi (PV), görünür viskozitesi (AV), kopma noktası (YP), jel mukavemeti (10 saniye ve 10 dakika) gibi reolojik analizleri FANN viskozimetresi ile, sıvı (filtrasyon) kaybı ve sondaj çamuru kek kalınlığı analizleri de Amerikan Petrol Enstitüsü (API) sıvı kaybı test ekipmanları ile API standartlarına uygun olacak şekilde yapılmıştır. Katkısız su bazlı sondaj çamuru ile karşılaştırıldığında; Al 2 O 3 NP/ÇDKNT'ün su bazlı sondaj çamurlarının PV değerini %85.7, AV değerini %41.8, YP değerini %20, 10 saniye ve 10 dakika değerlerini sırasıyla %16.6 ve %11 oranında arttırdığı, filtrasyon kaybı değerini %13.8 oranında azalttığı; aynı zamanda kek kalınlığı değerini de %18.5 oranında arttığı görülmüştür.

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“…A large effort has been put into the development of new Lost Circulation Materials (LCMs) and technologies to plug the openings in the wellbores, with various levels of success. The key to experience a "fluid loss free" drilling operation lies within the ability to build a firm and high strength plug over the fractures and other types of "thief zones" to maintain the fluid level in the borehole [4,5]. LCMs with diameters in the range of 0.1-100μm could play an important role when the fluid loss occurs in 0.1μml mm porous formations.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles as Drilling Fluids Rheological Properties Modifiers

Ruqeishi

Salmi

Mohiuddin

2018

PPS

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Drilling for water, oil, or even gas using water-based drilling fluids faces major challenges. These are mainly related to drilling fluid leakage into the surrounding formation, water loss into fractures, and the reduction of fluid density or/and viscosity through the drilling circulation process. Nanoadditives with high surface to volume ratio of carbon nanoparticles (CNP), ~50nm, and ZnO nanowires provide significant control of drilling fluid rheological properties. CNP additives were found to maintain the homogeneity of the drilling fluid components for a longer time and delay fluid sagging effect. Drilling fluid densities were enhanced by a factor of 4-10% after addition of CNP or ZnO nanowires to the untreated drilling fluid by 1-3 wt. %. Progressively, when 1, 2 and 3g of CNP was added to the drilling fluid, the resultant filtrate water volume was reduced by 7, 4.8 and 4mL respectively. The maximum water loss reduction measured was about 50% of the total fluid loss. Additionally, about a 24% increase in the drilling fluid viscosity was achieved when 2g of ZnO nanowires were added.

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Multiphase hydrodynamic analysis of pneumatic transportation ofdrill cuttings in air drilling

Cited by 10 publications

References 6 publications

Investigation on Coal Fragmentation by High-Velocity Water Jet in Drilling: Size Distributions and Fractal Characteristics

Investigation on Coal Fragmentation by High-Velocity Water Jet in Drilling: Size Distributions and Fractal Characteristics

Al2O3 Nanopartikülleri İçeren Çok Duvarlı Karbon Nanotüpler Kullanılarak Su Bazlı Sondaj Çamurlarının Reolojik ve Filtrasyon Özelliklerinin Geliştirilmesinde Yenilikçi Bir Yaklaşım: Deneysel Araştırma

Nanoparticles as Drilling Fluids Rheological Properties Modifiers

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