检索结果-内蒙古大学图书馆

Fabrication of a Hydrophobic Hierarchical Surface on Shale Using Modified Nano-SiO_(2)for Strengthening the Wellbore Wall in drilling engineering

引用

engineering 2022年第4期8卷 101-110页

作者： Xianbin Huang Jinsheng Sun He Li ren Wang Kaihe Lv Haichao Li Key Laboratory of Unconventional Oil and Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao 266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China CNPC Engineering Technology R&D Co. Ltd.Beijing 102206China

Wellbore stability is essential for safe and efficient drilling during oil and gas exploration and *** paper introduces a hydrophobic nano-silica(HNS)for use in strengthening the wellbore wall when using a water-based drilling fluid(WBF).The wellbore-strengthening performance was studied using the linear swelling test,hot-rolling recovery test,and compressive strength *** mechanism of strengthening the wellbore wall was studied by means of experiments on the zeta potential,particle size,contact angle,and surface tension,and with the use of a scanning electron microscope(SEM).The surface free energy changes of the shale before and after HNS treatment were also calculated using the contact angle *** experimental results showed that HNS exhibited a good performance in inhibiting shale swelling and *** with the use of water,the use of HNS resulted in a 20%smaller linear swelling height of the bentonite pellets and an 11.53 times higher recovery of water-sensitive shale—a performance that exceeds those of the commonly used shale inhibitors KCl and *** importantly,the addition of HNS was effective in preventing a decrease in shale *** to the mechanism study,the good wellbore-strengthening performance of HNS can be attributed to three ***,the positively charged HNS balances parts of the negative charges of clay by means of electrostatic adsorption,thus inhibiting osmotic ***,HNS fabricates a lotus-leaf-like surface with a micro-nano hierarchical structure on shale after adsorption,which significantly increases the water contact angle of the shale surface and considerably reduces the surface free energy,thereby inhibiting surface ***,the decrease in capillary action and the effective plugging of the shale pores reduce the invasion of water and promote wellbore *** approach described herein may provide an avenue for inhibiting both the surface hydration and the os

关键词： Hydrophobic Nanoparticle Shale inhibitor drilling fluid Wellbore stability

来源：评论

学校读者我要写书评

暂无评论

Flow numerical simulation of tubing or casing leakage in gas well

Flow numerical simulation of tubing or casing leakage in gas...

引用

Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Zhang, Hong Yuan, Guangjie Li, Guotao Li, Jingcui Wan, Jifang Fu, Pan CNPC Engineering Technology R&D Company Limited Research Institute of Petroleum Exploration and Development CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

Tubing or casing leakage of HTHP gas wells and underground gas storage wells affects wellbore integrity adversely. The wellbore micro-leakage detection technology can detect tiny fluid leakage in time and is of great significance to avoid malignant gas leakage accident. The theoretical basis of wellbore microleakage detection technology is characterizing the leakage flow field. To reveal the flow characteristics of gas leakage due to tubing and casing cracks and perforations, a CFd model of gas aperture leak has been established and flow field numerical simulation of high-speed and high-pressure gas outflow through aperture was conducted. The standard k-e turbulence model was used to calculate and analyze the pressure and velocity distribution of the steady flow field. In addition, a time step was set on the steady-state model and the Scale-Adaptive Simulation (SAS) model was adopted to simulate the transient flow field with the initial conditions of the steady-state simulation results. The effects of the shape and size of the leakage hole, the pressure inside the pipe, and the medium in the outer annular space on the flow field were analyzed. The results show that obvious turbulence disturbance appears near the inlet of the leakage hole and supersonic under-expansion jet forms near the outlet of the leakage hole under the gas well working conditions, creating the expansion wave and shock wave. The flow velocity of gas leakage through the circular hole is the highest, while that of the slot hole is the lowest under the same conditions. The larger the leakage aperture is, the greater the pressure difference between inside and outside of the pipe is, and the more drastic variation of gas velocity in the leakage hole. The method and results provide theoretical guidance for the microleakage detection technology of gas well wellbore. © 2020, Society of Petroleum Engineers

关键词： Flow fields

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Well Performance of Child Wells with Complex Fracture Hits from Parent Wells 55

Evaluation of Well Performance of Child Wells with Complex F...

引用

55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： Liu, Chuxi Liu, Ziping Shen, Jianguo Zhang, Ping Wang, Yonghong Yang, Zhenzhou Yu, Wei Sepehrnoori, Kamy The University of Texas at Austin AustinTX United States CNPC Chuanqing Drilling Engineering Company Limited Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China Sim Tech LLC HoustonTX United States

ISBN: (纸本)9781713839125

An efficient numerical method using simple structured grids for accurate modelling of shale production with complex hydraulic fractures and natural fracture networks is very important to evaluate the impacts of frac hits. In this study, we applied a powerful non-intrusive EdFM (Embedded discrete Fracture Model) method in conjunction with a traditional reservoir simulator with structured grids to simulate shale gas production under different degrees of frac hits. Through the non-intrusive EdFM method, natural fractures that are connected with primary hydraulic fractures can be easily embedded into the structured grids without the need of unstructured grids and local grid refinement. We built a field-scale shale gas reservoir model with a parent/child horizontal well set and a stochastic distribution of inter well natural fractures. We performed a short term (3-year) production simulation with a flowing bottomhole pressure constraint that has a similar decline trend to the field observation. The gas flow rate and cumulative gas production for the three designed frac hits scenarios are plotted and compared. In addition, pressure distributions in matrix and fractures, and drainage volumes for the three designed scenarios after 1 year and 3 years of production are visualized and compared. Understanding the impact of inter well frac hits on well performance in shale reservoirs with the non-intrusive EdFM method provides significant insights for the spacing/drilling job optimization of unconventional resources. © 2021 ArMA, American rock Mechanics Association

关键词： Stochastic systems

来源：评论

学校读者我要写书评

暂无评论

Identification of shale bedding layers from micromechanical evaluation

Identification of shale bedding layers from micromechanical ...

引用

SPE Annual Technical Conference and Exhibition 2021, ATCE 2021

作者： Cheng, Shizhong Sheng, Mao Chen, Zhaowei Tian, Shouceng Li, Gensheng State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-Beijing China CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997864

Bedding layers are well-developed in shale and recognized to enhance the complexity of the hydraulic fracture network. A micromechanical evaluation approach of shale bedding layers based on indentation testing techniques was proposed. rock thin section identification and scanning electron microscope were utilized to describe the shale laminations. To capture high-resolution image with large area and ensure abundant morphology and mineral information, Atlas 5 system, which could create large mosaic images, was applied. Combined with FIB, a method for positioning the laminations in SEM and accurately navigate to it in the micromechanics experiment was established. Fractures were emphasized to be initiated and extend in the clay mineral layers. It can be explained that the flaky structure of clay mineral is beneficial for the extension of fracture. It will become more potential to connect with the fluid-driven fractures. Nanoindentation was conducted to obtain micromechanical properties in different lamination layers. results verify the feasibility of this scheme and demonstrate fine-grained, transition and coarse-grained layers. Indentation results show variation in micromechanical properties of coarse-grained layer, the transition layer and the fine-grained layers. The present work is helpful to identify shale bedding layers from micromechanical evalutions. © 2021, Society of Petroleum Engineers

关键词： Shale

来源：评论

学校读者我要写书评

暂无评论

A real-Time Friction Prediction Model for in Service drill String Based on Machine Learning Methods Coupling with Mechanical Mechanism Analysis

A Real-Time Friction Prediction Model for in Service Drill S...

引用

2021 SPE Middle East Oil and Gas Show and Conference, MEOS 2021

作者： Guo, Huijuan Luo, Huaidong Zhan, Guodong Wang, Baodong Zhu, Shuo CNPC Engineering Technology R&D Company Limited CNPC Interational Chad Co. Ltd EXPEC Advanced Research Center Saudi Arabia China University of Petroleum-Beijing China

ISBN: (纸本)9781613997727

With highly deviated wells and horizontal wells are widely used in the oil industry. The large slope well sections and long horizontal well sections will lead to a sharp increase of the drill string torque and friction, which may reduce the drilling efficiency, and even lead to accidents. Therefore, real-time and accurate analysis of drill string's torque and friction is an urgent problem facing by the modern drilling technology. The paper established a real-time friction prediction model that combines machine learning methods with drill string mechanical mechanism analysis model. Based on 84000 sets of field monitoring data obtained on-site, a regular data training set for weight on bit (WOB) and torque prediction was constructed with 23 types of time-series related parameters and 10 types of timing independent parameters. relationships between time-series related parameters and timing independent parameters with the weight on bit and torque were trained to utilize long and short-term memory (LSTM) neural network and muti-layer back propagation (BP) network respectively. The new developed LSTM-BP neural network achieves high-precision prediction results of WOB and torque with a relative error of less than 14%. Based on derived WOB and torque prediction results, a theoretical mechanical analysis model of the entire drill string was adopted in this paper to develop the quantitative relation between WOB and torque with the friction coefficient of the drill string and oil casing. Suitable friction coefficients along the drill string can be finally obtained by solving the equilibrium function between predicted WOB, torque and measured hook load, rotary-table torque via an iteration algorithm. A case study was performed finally using the proposed intelligent analysis method to calculate the friction coefficients. This proposed methodology can be referenced to decrease the sticking risks and improve the drilling efficiency, which can finally increase the extension limit o

关键词： Friction

来源：评论

学校读者我要写书评

暂无评论

Intelligent direct-drive Top drive design of Synchronous Permanent Magnet Motor with Phase Change Heat dissipation

Intelligent Direct-Drive Top Drive Design of Synchronous Per...

引用

2023 SPE/IAdC Middle East drilling technology Conference and Exhibition, MEdT 2023

作者： Han, Haochen Wang, Bo Li, Bo Cheng, Tengfei Fengliu, Hui Zhang, Yao Chu, Fei CPET Beijing Petroleum Machinery Co. Ltd. Beijing China CNPC R&D DIFC Company Limited Dubai United Arab Emirates CPET Beijing KEMBL Petroleum Technology Development Co. Ltd. Beijing China

ISBN: (纸本)9781613999974

In drilling operation, drilling NPT caused by top drive mechanical failure and high noisy and energy suffered a lot onsite. This paper introduces a top drive which utilizes a permanent magnet synchronous AC motor to drive the quill directly without a gearbox which can shorten drive chain. Meanwhile, its symmetrical and compact mechanical construction and shorter main and control cables obviously improve installation efficiency and effectively reduce the failure rate. We conducted research through structural design, motor efficiency and heat dissipation, and automation system upgrades to form a set of high-efficiency, high-performance direct drive top drive. Transmission structure aspect: design of direct-drive top drive structure, calculation and verification of main load bearing parts, analysis of top drive failure types and effects. Motor energy efficiency aspect: research on speed measurement method of permanent magnet direct drive motor, precise control method of permanent magnet direct drive motor, and closed phase change heat dissipation technology. Automation enhancement aspect: research on control system architecture, self-diagnosis system, One-click operating system. This study resulted in three research findings including synchronous permanent magnet motor design, One-Click operating system with self-diagnosis and efficient self-circulation heat dissipation technology. The new generation of direct-drive top drive can reduce current required by 100-200A and increase efficiency by 20-30% compared with asynchronous motor, while meeting the requirements of corresponding rated load, rated power, speed and continuous torque. It can realize quill rotation precision less than 1° under load and keep the speed fluctuation reduced from 10.6% to 1.1% by improving the motor dynamic response performance. The One-click control method realized by preset parameters can reduce the driller's repeated operation and visual judgment. The tripping efficiency can be increased by

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

Achieving Improved drilling Performance with Hole Cleaning technology in Horizontal Shale Gas Wells in Sichuan Basin of China

Achieving Improved Drilling Performance with Hole Cleaning T...

引用

2021 International Petroleum technology Conference, IPTC 2021

作者： Ji, Guodong Wang, Haige Huang, Hongchun Cui, Meng Yulong, Feixue Ma, Ying Sun, Xiaofeng CNPC Engineering Technology R&D Company Limited Research Institute of Petroleum Exploration and Development PetroChina China Northeast Petroleum University China

ISBN: (纸本)9781613997314

The horizontal section length of shale gas horizontal wells in Sichuan Basin in the south-west of China generally exceeds 2000m. Cuttings are apt to accumulate and form cuttings beds along such long and curve horizontal sections due to low cuttings carrying capacity, which often results in excessive torque and drag or even stuck pipes during drilling process. According to the statistics dada inthe period of Jan. - Oct. 2019, more than 25 stuck pipe incidents and 15 rotary steering tools loss in borehole were reported due to inefficient cuttings transportation in the long horizontal wells in Sichuan Basin. This paper studies the cuttings transportation and cuttings bed formation in horizontal wells. A prediction model for the distribution of cuttings bed was established. A monitoring and analysis software for the cuttings bed and cuttings cleaner with V-shaped spiral blades that is used to agitate the cuttings bed wasdeveloped. The software calculates the distribution and thickness of the cuttings bed according to the well trajectory, wellbore structure, drilling fluid characteristics, etc., and provides the optimal operating parameters for the removal of the cuttings bed by the rotating and reciprocating drill string. Then, the drill cuttings remover in the drill string moves to the predicted position of the drill cuttings, scrapes the drill cuttings and creates a swirling flow during the pipe rotation. The combined application of software and makeup remover can effectively solve the issue of borehole cleaning in long horizontal wells. One of the field applications was carried out in the well Ning 209H12, a shale gas horizontal well in Sichuan Basin. The well experienced excessive torque and drag issue during the tripping of drill string of long horizontal section. Thesoftware ran based on oil well data, and it determines the placement and thickness of cuttings beds in the well and calculates the optimal operating parameters for a flow rate of about 32L/s and a spee

关键词： Horizontal wells

来源：评论

学校读者我要写书评

暂无评论

Case study: In-situ stress characteristics and fracture zone activation analysis of Changning shale gas in Sichuan Basin 55

Case study: In-situ stress characteristics and fracture zone...

引用

55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： Zhaowei, Chen Hu, Cao Yuanhui, Shi Jianhui, dong CNPC Engineering Technology R&D Company Limited Beijing China Beijing China Sinopec Jianghan Petroleum Engineering Co. Ltd Hubei Qianjiang China CNPC Emergency coordination office Beijing China

ISBN: (纸本)9781713839125

In the Changning Shale Gas development blocks in Sichuan Basin, casing deformation seriously restricted the efficient development of shale gas. Based on stress quadrilateral principle, the in-situ stress model of Changning area is established. The seismic and microseismic data were used to analyze the characteristics of fracture zone. Based on the principle of critical stress fault, the mechanical activity of fracture zone was analyzed. Finally, the in-situ stress characteristics, fracture zone development and fracture zone activity of Fuling block and Barnett block were discussed. The results showed that Changing area is in the reverse strike slip stress mode, and the difference between the shear stress and the sliding resistance on the fracture zone with high dip angle is the minimum, which is the internal reason why the fracture zone is easy to be activated. The sliding resistance on the fracture zone is greatly reduced by fracturing operation, which is the external reason for the fracture zone sliding induced by fracturing. This result states the geomechanical reasons of casing deformation in Changning area, which provides theoretical significance to solve the problem of casing deformation in Changning area. Copyright © 2021 ArMA, American rock Mechanics Association.

关键词： deformation

来源：评论

学校读者我要写书评

暂无评论

Integration Cementing technology for Ultra-deep HTHP High Salinity and High Hydrogen Sulfide Well 11th

Integration Cementing Technology for Ultra-deep HTHP High Sa...

引用

11th International Field Exploration and development Conference, IFEdC 2021

作者： Gu, Yi-xin Baletabieke, Bahedaer Chen, Chi Han, Fei Qian, Feng Xiao, Yue Xiang, Ying Jing, Ning du, Yu Xiao, Xu CNPC Engineering Technology R&D Company Limited Beijing China Exploration Division PetroChina Southwest Oil and Gasfield Company Chengdu China China National Oil and Gas Exploration and Development Company Ltd. Beijing China China Petroleum Longhui Automation Engineering Co. Ltd. Langfang China China Petroleum Maintenance and Emergency Repair Company Langfang China

ISBN: (纸本)9789811921483

Well-M15 is an ultra-deep exploratory well deployed by cnpc in the Mingebulak project. Its geological conditions are complex, with the characteristics of high temperature, high pressure, high salt, high hydrogen sulfide, and ultra-deep——"four highs and one super". In the process of cementing, there are problems such as low displacement efficiency, easy mixing of cement slurry, complex formation pressure layers, and high requirements for casing accessories and special well-entry tools, which seriously affect the sealing effect and cementing quality. In view of the above difficulties, the cement slurry design of Well-M15 is based on the optimization of the mature system formula. Choose solid anti-salt fluid loss agent G33S for the second-spud, and choose matrix anti-invasion and anti-channeling agent BCG-200L for the third-spud, which has good salt resistance, temperature resistance and channeling resistance. At the same time, for the purpose of salt resistance, each level of casing cement slurry system is optimized to improve the specific cement slurry formula to meet the cementing needs. Large-size casing floating shoes and floating hoops focus on erosion resistance, while deep well cementing tools focus on high temperature and pressure resistance, which effectively guarantees cementing operations. The successful drilling of Well-M15 has set a series of new records for cnpc’s overseas projects, including the deepest casing of the same size, the largest injection volume, the longest one-time sealing section, the deepest application of graded cementing technology, and the highest density of cement slurry. At the same time, it has also created a new record of quality qualification rate and quality rate of deep well liner cementing in Uzbekistan, providing a reference for the cementing of deep wells and complex wells in similar blocks in the future. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hydrogen sulfide

来源：评论

学校读者我要写书评

暂无评论

Injectivity decline Under Langmuirian Pore Blocking: Analytical Model and Field Cases

SSRN

引用

SSrN 2023年

作者： Liu, Huifeng Osipov, Yuri Yuan, Zebo Chen, Zhangxin Liu, Qi Liu, Bingshan CNPC R&D（DIFC）Company Limited Dubai United Arab Emirates Moscow State University of Civil Engineering Moscow Russia PetroChina Tarim Oilfield Company Xinjiang Korla China Department of Chemical and Petroleum Engineering University of Calgary CalgaryAB Canada CNPC Engineering Technology Research and Development Company Limited Beijing China

The well injectivity decline during waterflooding is a widespread phenomenon. The reason is that injected particles retain in pores and block flow channels in near-wellbore regions, yielding permeability decline. A predictive model for this phenomenon is useful for technology development of damage prevention, mitigation or removal. Previous works assume constant filtration coefficient while long-time accumulation of captured particles can cause significant variation of filtration coefficient, strongly affecting the permeability and injectivity decline. In this paper, an analytical model for radial suspension transport in porous media is based on the Langmuirian blocking filtration function, where the particle capture probability linearly depends on the retained concentration. The solution is obtained as an asymptotic expansion using the dimensionless distance from wellbore as a small parameter. The exact expression of retained particle concentration at the concentration front is also obtained. For comparison, numerical solutions are also obtained by Shampine’s code, which is based on the explicit central finite deference method. Comparisons between the analytical and numerical solutions of retained particle concentration show that their difference errors do not exceed 5% in waterflooding conditions. Based on the analytical solution of retained particle concentration, expressions of injection pressure, skin factor and damaged zone radius are also derived. True water injection and damage removal treatment data from Tarim Oilfield, western China, is used to test the analytical solutions of damaged zone radius. It shows that the calculated results are basically consistent with the actual situation. The analytical expressions in this paper can be used for predicting the damage extent of an injector and quantitatively optimizing an acidizing job by estimating the required acid volume to remove the damage. © 2023, The Authors. All rights reserved.

关键词： Analytical models

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：