检索结果-内蒙古大学图书馆

8th International Field Exploration and development Conference, IFEDC 2018

作者： Ouyang, Weiping Yang, Deyong Sun, Hedong Changqing Downhole Technology Company CNPC Chuanqing Drilling Engineering Company Limited Xi’anShaanxi710018 China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields Xi’anShaanxi710018 China Department of Gas Field Development PetroChina Research Institute of Petroleum Exploration and Development LangfangHebei065007 China

ISBN: (纸本)9789811371264

Due to engineering or geological reasons, oil and gas wells are frequently completed using a partially perforated method. Complicated spatial distribution of perforation tunnels is too difficult to be considered in the conventional analytic solution model, and there is still short of a well test model regarding the partially perforated well. Therefore, this paper develops a 3D numerical well test model for partially perforated wells, which not only accurately describe the perforation tunnels distribution near the wellbore, but also consider the characteristics of perforation compacted zone, formation damaged zone, and permeability anisotropy. The 3D finite element method is utilized to conduct numerical solutions to the model, and the pressure response curves and pressure fields are obtained for the first time. Characteristics of the pressure response curves and pressure fields are studied as well as the effects of other factors, such as perforated position, perforation compacted zone, and formation damaged zone on the pressure response curve. The results show that the pressure response of partially perforated well is characterized by both totally perforated well and partially penetrated well. It not only has an early locally radial flow characteristic around the perforation tunnels, but also has an ellipsoidal (spherical) flow characteristic. Compared with perforation at either top or bottom, the perforation in the middle weakens the inter-perforation interference. The effect of perforation compacted zone can be replaced by reducing the effective perforation radius. The increase of perforation length can largely reduce the effect of formation damaged zone on the pressure response curve and productivity of partially perforated well. Finally, the total skin computing formula of the partially perforated well is verified by means of calculation of cases with different perforation lengths and different perforated level coefficients. © Springer Nature Singapore Pte Ltd 2

关键词： Radial flow

来源：评论

学校读者我要写书评

暂无评论

research on Intelligent Bit Design and Manufacturing technology

Research on Intelligent Bit Design and Manufacturing Technol...

引用

IEEE International Conference on Cloud Computing and Big Data Analysis (ICCCBDA)

作者： Ran Qihua Fulei Wan Dengyun Lu Hu Deng Zhilin Li Lin Zhang CCDC Shale Gas Exploration and Development Department CNPC Chuanqing Drilling Engineering Company Limited Chengdu China Drilling & Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering Company Limited Guanghan China

ISBN: (数字)9781728160245

ISBN: (纸本)9781728160252

As the main tool for rock breaking, the bit with features of personalized and high efficiency is more and more popular in different strata, different well sections and different working conditions. By using Intelligent design and manufacturing technology, the optimization and manufacturing efficiency of bit are improved. The intelligent bit design and manufacturing technology includes three core elements: intelligent design, real-time drilling monitoring & risk identification, and post-drill evaluation. This technology has been applied in more than 10 wells in the Sichuan-Yunnan region, which produced the remarkable results. The bits' manufacturing efficiency was increased by 800%, the footage and ROP were improved. At the meantime, the number of bits consumed in a single well has been greatly reduced. Next, the best optimization should be implemented in these respects, such as intelligent individualized bit design and application technology, big data analysis model, intelligent manufacturing and the image recognition technology, and then the application range can be extended to more regions.

关键词： Drilling machines Manufacturing Rocks Optimization Real-time systems Companies Three-dimensional displays

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation of Hydraulic Fracturing-Assisted Depressurization development in Hydrate Bearing Layers Based on Discrete Fracture Models

SSRN

引用

SSRN 2022年

作者： Liu, Yongge Li, Guo Chen, Jing Bai, Yajie Hou, Jian Xu, Hongzhi Zhao, Ermeng Chen, Zhangxin He, Jiayuan Zhang, Le Cen, Xueqi Chuvilin, Evgeny Ministry of Education Qingdao266580 China Qingdao266580 China PetroChina Research Institute of Petroleum Exploration and Development Beijing100083 China CNPC Engineering Technology Research Company Limited Tianjin345000 China Chemical and Petroleum Engineering University of Calgary CalgaryABT2N1N4 Canada SINOPEC Petroleum Exploration and Production Research Institute Beijing102206 China Skolkovo Innovation Center Skolkovo Institute of Science and Technology Moscow121205 Russia

A new simulation method for hydraulic fracturing-assisted depressurization development of HBLs is developed, in which the mass transfers of matrix-matrix, fracture-matrix, and fracture-fracture are obtained based on discrete fracture models, and a PEBI unstructured grid is adopted to achieve accurate characterization of complex fracture shapes, while the overall number of equations to be solved are greatly reduced by adaptive refinement. Then, a numerical simulation model was established based on the geological parameters of Class III HBLs in the South China Sea, and the influence of hydraulic fracturing on the gas production was investigated. The results showed that for a HBL with a matrix permeability of 7.5 mD, hydraulic fracturing can greatly accelerate the dissociation rate of hydrates, and a fracturing case can increase the cumulative gas production by 115.5% compared with a case without fracturing. For a HBL with a matrix permeability of 75 mD, the fracturing case can effectively increase the gas production rate in an early stage of depressurization, but in a late stage, the gas production rate is mainly subjected to limited heat in the HBL. At the end of simulation, the fracturing case only increases the cumulative gas production by 3.2% compared with the non-fracturing case. © 2022, The Authors. All rights reserved.

关键词： Hydraulic fracturing

来源：评论

学校读者我要写书评

暂无评论

Study on rock breaking efficiency of special shaped cutters

引用

IOP Conference Series: Earth and Environmental Science 2022年第1期983卷

作者： Qi Peng Yingcao Zhou Jiaqing Yu Xiongwen Yang Yu Liu Chi Ma Chris Cheng Xiaohua Ke CNPC Engineering Technology R & D Company Limited Beijing China Research Institute of Petroleum Exploration & Development Beijing China CNPC USA Corporation (Houston TX USA)

The optimization of cutter shape has become one of the main innovation direction of PDC bit technology. At present, both domestic and foreign bit manufacturers have put forward various special shaped cutters to improve rock breaking efficiency. However, there are relatively few researches which focus on the rock breaking efficiency of special-shaped cutters. Therefore, three kinds of typical cutters (flat cutter, convex cutter and concave cutter) are selected as the study object in this paper. Based on the single cutter test, the relationship of axial cutting force, cutting area and cutting specific energy under different working conditions will be provided. The experimental results show that the axial cutting force and specific energy of concave cutter and convex cutter are lower than that of flat cutter in most test cases. The results are almost the same for both Vosges sandstone and Marcellus shale cases. In other words, the tested concave cutters are easier to intrude into rock and obtain higher rock brea king efficiency under the same cutting conditions, when compared with flat cutter and convex cutter. The experimental method provides a technica l reference for studying the rock breaking efficiency of three-dimensional cutters with different shapes.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of bedding structures on hydraulic fracture propagation behavior investigated using a coupled thermo-hydraulic-mechanical numerical model based on the phase-field cohesive zone method

引用

Computers and Geotechnics 2025年 186卷

作者： Xun Gong Zhijun Jin Xinhua Ma Yuyang Liu Chunyang Hong Institute of Energy Peking University Beijing 100871 China School of Earth and Space Sciences Peking University Beijing 100871 China Research Institute of Petroleum Exploration and Development (RIPED) PetroChina Beijing 100083 China National Shale Gas Research & Development (Experiment) Center LangFang 065007 China Key Laboratory of Coal-rock Gas CNPC Langfang 065007 China CNPC Engineering Technology R＆D Company Limited China

Shale contains numerous bedding structures, and the degree of communication with hydraulic fractures during the fracturing process affects the complexity of the generated fracture network. However, the propagation behavior of hydraulic fractures in bedding is complex and variable, and there are many influencing factors, limiting the effect of reservoir stimulation. Therefore, to improve the reservoir stimulation volume, this paper establishes a two-dimensional thermo-hydraulic-mechanical-phase field damage model based on the phase-field method and the cohesive zone method to simulate the propagation behavior of hydraulic fractures in bedding. The results show that three propagation patterns, namely, turning, turning and deviating and directly passing through, may occur when a hydraulic fracture encounters bedding. The specific conditions are affected by the mechanical properties of the rock, stress, bedding inclination angle, temperature, and other factors. During the fracturing process, increases in the ratio of the elastic modulus of the rock matrix to that of bedding, the bedding inclination angle, and the temperature are conducive to hydraulic fracture turning along bedding, and the bedding intersection angle is 0°, which is the optimal angle for hydraulic fractures to pass through bedding directly. In contrast, an increase in the principal stress difference is conducive to hydraulic fractures passing through bedding directly. Second, on the basis of the four influencing factors, namely, the shale matrix/bedding elastic modulus ratio, bedding inclination angle, principal stress difference, and temperature, a propagation criterion for hydraulic fractures in bedding under different influencing factors was established. The research results will guide the design and optimization of fracturing in shale with bedding.

关键词：

来源：评论

学校读者我要写书评

暂无评论

research on the method of dynamic PDC cutters distribution

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期675卷

作者： Qi Peng Yingcao Zhou Xiongwen Yang Yu Liu Chris Cheng CNPC Engineering Technology R & D Company Limited Beijing China Research Institute of Petroleum Exploration & Development Beijing China CNPC USA Corporation (Houston TX USA)

PDC bit design, especially the design of the crown and cutters of PDC bit, is a relatively complex analysis process, which involves many factors such as the back-dip angle, cutting depth, cutting force, cutting power and other factors of PDC cutters. At present, the traditional design methods of PDC cutters distribution are mostly based on analysis of rock breaking efficiency of single cutter, which can only reflect the working state of the single cutter under the set parameters, and cannot fully reflect the differences of different positional cutters during the cutting process. In order to solve this problem, this article proposes a dynamic method through target formation lithology characteristics. The working parameters of all the PDC cutters are analyzed in detail basing on equal wear theory and bottom hole covering theory. The working parameters include static parameters (cutting position, back dip angle, cutting depth, effective cutting area.) and dynamic parameters (cutting force, cutting power, cutting torque and cutting energy etc.). The energy required by all the PDC cutters to break rock of per volume during drilling process is taken as the target constraint condition for iterative analysis. This design method can intuitively and effectively analyse the working parameters of cutters which located bit core, nose, shoulder and gauge area, and it provides a good reference for dynamic balance design of PDC bit.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Preventing crude oil leakage into the upper aquifer from happening in steam huff-puff production wells

Preventing crude oil leakage into the upper aquifer from hap...

引用

SPE Symposium: Asia Pacific Health, Safety, Security, Environment and Social Responsibility 2019

作者： Wang, Lei Sun, Wenyong Chu, Shengli Cen, Xueqi Luan, Guohua Li, Na Su, Hua Wen, Liangfan Liu, Hu Tian, Guoqiang Chen, Yihe CNPC Research Institute of Safety and Environment Technology China Exploration and Production Research Institute SINOPEC China CCDC Changqing Well Cementing Company China China Petroleum Technology and Development Corporation China Nan Pu Oilfield Operation Distric of Petrochina Jidong Oilfield Company China ChangQing Well Cementing Company ChuanQing Drilling Engineering Limited CNPC China Sinopec International Co. Ltd China

ISBN: (纸本)9781613996546

Oil leakage into the upper aquifer is generally considered to be an environmentally-unfriendly issue and shorten production life. Despite not necessarily receiving the most coverage, oil leakage do happen in steam huff-puff production wells and may actually occur more frequently than we perceive. Presently, the oil leakage through annular space around a cemented casing into upper water layer during huff stage has become a problem to be urgently solved in thermal recovery production. The solutions to this difficulty are usage of thermal-stability cement slurry system with high-adsorbability additives and thickened low-permeability surface cement sheath. The well section from 100 metres below the upper aquifer is cemented by thickened cement sheath, and the rest well section from the bottom of oil layer to the wellhead is cemented by a novel high-adsorbability cement slurry system. The objective of usage of high-adsorbability cement slurry system is to absorb spilled oil, and the objective of the thickened low-permeability surface cement sheath is to achieve a stable physical plugging. SEM photographs indicate that the microstructure of thermal-stability cement paste after high-temperature steam is more compact. The performance of hardened cement paste before and after steam vapor curing shows that the compression strength, tensile strength and shear stress had little change. It avoids annular cement paste as a channel for the leakage of crude oil. The scaled 3D oil adsorption physical simulation was employed to examine the effectiveness of cement paste with high-adsorbability additives. It can reduce the migration of oil, and the pollution is limited in the annular space. The results show that permeability of cement paste is about 0.03×10-3 μm3. The thickened low-permeability surface cement paste ensures that spilled oil cannot enter the upper aquifer. These results had been validated on site test. The CBL/VDL test report revealed that acoustic amplitude value of the

关键词： Thermodynamic stability

来源：评论

学校读者我要写书评

暂无评论

Investigation of image segmentation effect on the accuracy of reconstructed digital core models of coquina carbonate

引用

Applied Geophysics 2020年第4期17卷 501-512页

作者： Wang Hai-Tao Wang Li Lai Fu-Qiang Zhang Jin-Yan School of Petroleum Engineering Chongqing University of Science&TechnologyChongqing 401331China National and Local Joint Engineering Research Center of Shale Gas Exploration and Development Chongqing 401120China Key Laboratory of Complex Oil and Gas Field Exploration and Development Chongqing University of Science&TechnologyChongqing 401331China The First Oil Production Plant of Changqing Oilfi eld PetroChina Company LimitedShanxi Yan’An 716000China Logging Application Research Institute CNPC LoggingShanxi Xi’An 710000China Well Logging Company Shengli Oilfi eld Service CorporationSinopecShandong Dongying 257096China

Digital core models reconstructed using X-ray tomography(X-CT)enable the quantitative characterization of the pore structure in three dimensions(3D)and the numerical simulation of *** the X-CT images accurately reflect the micro structures of core samples,the greyscale threshold in the image segmentation determines the accuracy of digital cores and the simulated petrophysical ***,it is vital to investigate the comparison parameter for determining the key greyscale threshold and the criterion to describe the accuracy of the *** coquina digital core models from X-CT are used in this work to study the impact of grayscale threshold on the porosity,pore percolation,connectivity and electrical resistivity of the pore scale model and these simulations are calculated by Minkowski functions,component labeling and fi nite element method,respectively,to quantify the pore structure and simulate electrical *** showed that the simulated physical properties of the digital cores,varied with the gradual increase of the greyscale *** the four parameters related to the threshold,the porosity was most sensitive and chose as the comparison parameter to judge the accuracy of the greyscale *** variations of the threshold change the micro pore structures,and then the electrical *** the porosity of the digital core model is close to the experimental porosity,the simulated porosity exponent matches the experimental porosity exponents *** good agreement proved that the porosity is the critical comparison parameter to describe the accuracy of image *** criterion is that the porosity of the digital core after segmentation should be close to the experimental porosity.

关键词： Porous media X-CT image segmentation digital core electrical resistivity simulation

来源：评论

学校读者我要写书评

暂无评论

A Seepage mathematical model for fractured wells of coalbed methane reservoirs and the corresponding pressure response feature

引用

IOP Conference Series: Earth and Environmental Science 2021年第2期714卷

作者： Chunchun Liu Cong Zhang Yanmei Xu Xinrui Cui Weigang Huang Aigu He Xiangyan Wang Yishan Liu Jigang Wang Shanxi CBM Exploration and Development Branch PetroChina Oilfield Company Shanxi Jincheng 048000 China Research Institute of Petroleum Exploration and Development Beijing 10083 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

Coalbed fracturing is one of the important engineering and technical means of coalbed methane stimulation. To establish the seepage model of coalbed gas fracturing well is the key scientific problem to effectively evaluate the fracturing effect. Therefore, based on the micro pore structure of coalbed methane, this paper constructs the physical model of three porosity and two permeability, the mathematical model of seepage and the mathematical model of bottom hole pressure response, and analyzes the key factors affecting the dynamic response characteristics of pressure. The results show that diffusion coefficient, channeling coefficient, reservoir volume ratio and conductivity have different effects on the bottom hole pressure of the vertical well of three hole and two permeability fracturing. The results of this paper have certain guiding significance for the drainage and production capacity prediction of coalbed methane.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fracturing Parameters Optimizing Simulation of Horizontal Well In WeiYuan Shale Gasfield

引用

Journal of Physics: Conference Series 2021年第1期2076卷

作者： Mingguang Che Meng Wang Bo Zeng Yi Song Wei Jiang Xiaofeng Zhang Kai Dong Department of Modern Mechanics of University of Science and Technology of China Anhui Hefei 230026 Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China XiNan Oil and Gas field Co. Ltd PetroChina Chengdu Sichuan 610041 China CNPC Chuanqing Drilling Engineering Company Limited Sichuan Chengdu 610031 CNPC Great Wall Drilling Engineering Company Limited Beijing 100101

Multistage fracturing and multi-clusters with long lateral fracturing were applied during developing the WeiYuan shale gas field, and the fracturing parameters were variable obviously for the fracturing lateral, perforating clusters, pumping rate, fracturing fluid volume and proppant quality. In this paper, the 3D geological model of a WeiYuan shale gas pad was used to simulate and optimize the fracturing parameters of the shale gas horizontal wells. The simulating results show that there is a reasonable matching relationship between different fracturing lateral length and the perforating clusters, and there is an optimal fluid volume and proppant quality. As the length of the fracturing lateral and the number of clusters increase, the spacing of horizontal wells need to be reduced reasonably. With the purpose of fracturing parameters optimization for WeiYuan shale gas horizontal wells, it is recommended to increase the number of perforation clusters, increase the treating rate, and use the reasonable fluid volume and proppant quality for different fracturing lateral. The research results of this paper have guiding significance for the optimization and treatment of fracturing shale gas horizontal well.

关键词：

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：