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A review of light amplification by stimulated emission of radiation in oil and gas well drilling 被引量:4
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作者 OLALEYE B M 《Mining Science and Technology》 EI CAS 2010年第5期752-757,共6页
The prospect of employing Light Amplification by Stimulated Emission of Radiation(LASER) for well drilling in oil and gas industry was examined.In this work,the experimental works carried out on various oil well drill... The prospect of employing Light Amplification by Stimulated Emission of Radiation(LASER) for well drilling in oil and gas industry was examined.In this work,the experimental works carried out on various oil well drilling operations was discussed.The results show that,LASER or LASER-aided oil and gas well drilling has many potential advantages over conventional rotary drilling,including high penetration rate,reduction or elimination of tripping,casing,bit costs,enhanced well control,as well as perforating and side-tracking capabilities.The investigation also reveals that modern infrared LASERs have a higher rate of rock cuttings removal than that of conventional rotary drilling and flame-jet spallation.It also reveals that LASER can destroy rock without damaging formation permeability but rather,it enhances or improves permeability and that permeability and porosity increases in all rock types.The paper has therefore provided more knowledge on the potential value to drilling operations and techniques using LASER. 展开更多
关键词 LASER OIL GAS well drilling simulation specific energy SPALLATION
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New Record for Horizontal Well Drilling
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《China Oil & Gas》 CAS 1998年第2期89-89,共1页
关键词 New Record for Horizontal well drilling
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CFD-DEM simulation of the hole cleaning process in a deviated well drilling: The effects of particle shape 被引量:10
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作者 Siamak Akhshik Mehdi Behzad Majid Rajabi 《Particuology》 SCIE EI CAS CSCD 2016年第2期72-82,共11页
We investigate the effect of particle shape on the transportation mechanism in well-drilling using a three-dimensional model that couples computational fluid dynamics (CFD) with the discrete element method (DEM). ... We investigate the effect of particle shape on the transportation mechanism in well-drilling using a three-dimensional model that couples computational fluid dynamics (CFD) with the discrete element method (DEM). This numerical method allows us to incorporate the fluid-particle interactions (drag force, contact force, Saffman lift force, Magnus lift force, buoyancy force) using momentum exchange and the non-Newtonian behavior of the fluid. The interactions of particle-particle, particle-wall, and particle-drill pipe are taken into account with the Hertz-Mindlin model. We compare the transport of spheres with non-spherical particles (non-smooth sphere, disc, and cubic) constructed via the multi- sphere method for a range of fluid inlet velocities and drill pipe inclination angles. The simulations are carried out for laboratory-scale drilling configurations. Our results demonstrate good agreement with published experimental data. We evaluate the fluid-particle flow patterns, the particle velocities, and the particle concentration profiles. The results reveal that particle sphericity plays a major role in the fluid-solid interaction. The traditional assumption of an ideal spherical particle may cause inaccurate results. 展开更多
关键词 CFD-DEM method Deviated well drilling Particles transport Two-way coupling scheme Particle-fluid Interaction
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Fracture sealing performance of granular lost circulation materials at elevated temperature:A theoretical and coupled CFD-DEM simulation study
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作者 Chong Lin Qi-Cong Xu +4 位作者 Lie-Xiang Han Gao Li Hai He Hong-Ling Zhou Ji-Ping She 《Petroleum Science》 SCIE EI CAS CSCD 2024年第1期567-581,共15页
Lost circulation is a common downhole problem of drilling in geothermal and high-temperature,high-pressure(HTHP)formations.Lost circulation material(LCM)is a regular preventive and remedial measure for lost circulatio... Lost circulation is a common downhole problem of drilling in geothermal and high-temperature,high-pressure(HTHP)formations.Lost circulation material(LCM)is a regular preventive and remedial measure for lost circulation.However,conventional LCMs seem ineffective in high-temperature formations.This may be due to the changes in the mechanical properties of LCMs and their sealing performance under high-temperature conditions.To understand how high temperature affects the fracture sealing performance of LCMs,we developed a coupled computational fluid dynamics-discrete element method(CFD-DEM)model to simulate the behavior of granular LCMs in fractures.We summarized the literature on the effects of high temperature on the mechanical properties of LCMs and the rheological properties of drilling fluid.We conducted sensitivity analyses to investigate how changing LCM slurry properties affected the fracture sealing efficiency at increasing temperatures.The results show that high temperature reduces the size,strength,and friction coefficient of LCMs as well as the drilling fluid viscosity.Smaller,softer,and less frictional LCM particles have lower bridging probability and slower bridging initiation.Smaller particles tend to form dual-particle bridges rather than single-particle bridges.These result in a deeper,tighter,but unstable sealing zone.Reduced drilling fluid viscosity leads to faster and shallower sealing zones. 展开更多
关键词 Geothermal well drilling HTHP formationLost circulation material CFD-DEM Fracture sealing
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The mechanism of microwave rock breaking and its potential application to rock-breaking technology in drilling 被引量:12
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作者 Ming-Zhong Gao Ben-Gao Yang +8 位作者 Jing Xie Si-Qi Ye Jun-Jun Liu Yi-Ting Liu Rui-Feng Tang Hai-Chun Hao Xuan Wang Xiang-Yue Wen Xue-Min Zhou 《Petroleum Science》 SCIE CAS CSCD 2022年第3期1110-1124,共15页
The exploration and development of oil and gas resources have shifted from shallow to deep and ultradeep.The difficulty of rock breaking has also increased,introducing new challenges to traditional rock-breaking techn... The exploration and development of oil and gas resources have shifted from shallow to deep and ultradeep.The difficulty of rock breaking has also increased,introducing new challenges to traditional rock-breaking technology.Hence,there is an urgent need to develop new rock-breaking technologies to improve the development efficiency of deep oil and gas resources.Therefore,this study focused on the new microwave rock-breaking technology and conducted experimental and numerical simulation research on typical deep,hard rock granite.The research results showed that granite in the microwave field exhibited high-temperature melting and fracture,and the highest temperature could reach 550°C.Under the irradiation of circulating microwaves,a minimum irradiation time threshold of 3 min was needed to cause irreversible damage to the rock.The numerical simulation results showed that the interaction of thermal stress and in situ stress would cause the inside of the rock stratum to separate into a disturbed deterioration area,disturbed unloading area and initial stress area.These results are expected to provide the necessary technical guidance and theoretical support for the research and development of high-efficiency rock-breaking drilling for deep hard rock. 展开更多
关键词 MICROWAVE well drilling High efficiency GRANITE
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STUDIES ON THE LAW OF LAMINAR HELICAL FLOW OF POWER-LAW FLUID IN ECCENTRIC ANNULI 被引量:1
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作者 李帮达 刘永健 张景富 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1993年第7期627-634,共8页
The flow of mud under a constant axial pressure gradient in eccentric annuli was studied extensively in this paper. Assumed that the inner wall was rotating at a constant angular velocity, then the constitutive equati... The flow of mud under a constant axial pressure gradient in eccentric annuli was studied extensively in this paper. Assumed that the inner wall was rotating at a constant angular velocity, then the constitutive equation of power law fluid and the equation of motion were given. The expressions of apparent viscosity, velocity, flow rate and pressure loss were obtained. In Some numerical results were given by alternation-substitution method. The conclusions are that the viscosity difference between wide and narrow clearance is reduced with increasing the rotation of inner cylinder and/or decreasing the eccentric distance. The flow rate will be increased with increasing the rotation of inner cylinder and eccentric distance, etc.. The pressure loss in eccentric flow is quite large than in concentric axial flow. The results are useful for calculating hydraulic parameters in drilling engineering. 展开更多
关键词 Confined flow Laminar flow well drilling
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Combining Diagnosis of the Casing and Tooljoint Wear in Mud Fluid While Drilling 被引量:2
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作者 樊建春 张来斌 +1 位作者 温东 余磊 《Tsinghua Science and Technology》 SCIE EI CAS 2004年第3期266-269,共4页
A ground monitoring system was developed to diagnose casing and tooljoint wear in a well dur-ing drilling by combining the analysis of wear debris with detection of the tooljoints. The result shows that the wear debri... A ground monitoring system was developed to diagnose casing and tooljoint wear in a well dur-ing drilling by combining the analysis of wear debris with detection of the tooljoints. The result shows that the wear debris concentration in the circulating drilling mud in a well reflects the total wear rate of the tribo-elements in the well, while the wear detection of a tooljoint can indicate its wear loss between two contigu-ous times of drill-pipe lifting. A diagnosis method that integrates the two types of information was developed to identify severe wear regions in well casing. Theoretical analyses and field test show that the severe cas-ing wear region can be located relatively accurately by the integrated method. This method presents a new ground casing wear diagnosis approach with good real-time results. 展开更多
关键词 casing wear fault diagnosis well drilling
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Reservoir forming conditions and key exploration and development technologies for marine shale gas fields in Fuling area, South China 被引量:4
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作者 Zhigang Wang 《Petroleum Research》 2018年第3期197-209,共13页
Although shale gas resources are abundant in China,commercial discoveries have not been made before the discovery of Fuling Shale Gas Field.SINOPEC has done lots of theoretical and technological studies on marine shal... Although shale gas resources are abundant in China,commercial discoveries have not been made before the discovery of Fuling Shale Gas Field.SINOPEC has done lots of theoretical and technological studies on marine shale gas development in China.Research shows shale gas has dynamic accumulations with early preservation and late reconstruction and proposes high-quality shale developed in deep-water shelf as the base and good preservation conditions as the key factor for shale gas accumulation.Key technologies and facilities were developed for geophysical survey of shale gas,design and optimization of shale gas development,drilling and completion of horizontal wells,and fracturing stimulation.As the first and largest shale gas field in China,the discovery and successful development of Fuling Shale Gas Filed has made China the first country to achieve large-scale development of shale gas after North America.By August 2017,Fuling Shale Gas Field had declared 6008.14×10^(8)m^(3) proven reserves,76.8×10^(8)m^(3) production capacity and 133.9×10^(8)m^(3) cumulative production.The construction of Fuling Shale Gas Field with high level,high speed and high quality has been a good example of shale gas development in China.Its successful experiences can be used to other fields and play an important role in optimizing energy structure and improving environment. 展开更多
关键词 Shale gas Exploration well drilling and completion Staged fracturing Environmental protection Commercial development Fuling area
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