检索结果-内蒙古大学图书馆

2024 SPE Gas and Oil technology Conference, GOTECH 2024

作者： Zhou, Y.S. Qu, C.F. Jiang, L. Zhang, H.W. Zhang, X.B. Huang, Z. Li, J.P. Zhou, C.Y. Cheng, S.d. Li, Y. CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781959025405

The actual downhole annulus is irregular, a variable cross-section geometry, due to the difference between the diameter of tool joints or downhole tools and the inner pipes. With the increasing of well depth, inevitable energy loss caused by contraction or expansion geometry is high in irregular annular flow. However, the energy loss generation mechanism for such irregular annulus flow is still unclear. The entropy production theory is considered as an excellent method for energy loss analysis, which is widely used in fluid machinery flow field. Therefore, the main purpose in this work is to reveal the energy loss generation mechanism caused by contraction and expansion geometry in irregular annulus based on entropy production method. In this paper, the spatial distribution of entropy production rate in irregular annular flow was depicted first. Then the inlet velocity and contraction-expansion ratio influence on different entropy production were discussed. Finally, we identified the high entropy production area and its main energy loss sources by quantitative analysis. The results show that 1) The high entropy production was mainly occurred at the entrance, downstream of the variable cross-section structure and near the wall. The proportion of time-average entropy production rate was relatively small and can be ignored. 2) The main energy loss areas were in narrow annulus and downstream of the variable cross-section structure, which the entropy production portion was about 55.8%~62.0% and 23.4%~26.4% separately. The main energy loss were wall and turbulent entropy production in these two areas. 3) The energy loss generated in downstream of the variable cross-section in annulus was more than that in upstream. Copyright © 2024, Society of Petroleum Engineers.

关键词： Energy dissipation

来源：评论

学校读者我要写书评

暂无评论

Prevent Barite Static Sag of Oil-Based Completion Fluid in Ultra-deep Wells

Prevent Barite Static Sag of Oil-Based Completion Fluid in U...

引用

2021 International Petroleum technology Conference, IPTC 2021

作者： Wang, Jianhua Zhang, Jiaqi Yan, Lili Cheng, rongchao Ni, Xiaoxiao Yang, Haijun CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781613997314

Oil-based mud (OBM) is the first choice for complex deep wells due to its advantages of high-temperature resistance, good lubrication and borehole stability. But barite sagging under ultra-high temperature during the long-time stationary completion operation may lead to serious problems in ultra-deep wells, for instance, pipe sticking, density variation and well control problems. In this paper, the influence of high-temperature and high-pressure (HTHP) on the performance of oil-based completion fluid was studied, and a model of rheological parameters was established with HTHP static sag law. The barite sagging stability was evaluated by a high temperature (220°C) and high pressure (100MPa) sag instrument. The results indicated that rM6 value and static shearing force were the main factors of affecting the settlement stability. The viscosity of the completion fluid significantly decreased with the increase of temperature, but increased with the increase of pressure. In addition, the relationship was also studied between HTHP rheology and atmospheric pressure rheology at 50°C. The results showed that when rM6 value was kept above 10, the sag stability factor (SF) of oil-based completion fluid was less than 0.52 at 190°C for 10 days, which proved a good high-temperature sag stability. Furthermore, the anti-high temperature property of oil-based completion fluid was improved through enhancing the temperature-resistance of the additives. And the high-temperature-resistant organic soil was introduced to raise the rM6 value and the static shearing force. Based on these solutions, the barite sag under high temperature of the oil-based completion fluid was prevented during drilling and completion operation in ultra-high temperature wells. The oil-based completion fluid was successfully used in Well Keshen 17 (175°C, 7475 m) in Kuche piedmont structure and TT 1 well (210°C, 6500 m) in Sichuan basin. The casing run smoothly, the oil-test operation was completed smoothly for 15

关键词： Additives

来源：评论

学校读者我要写书评

暂无评论

downhole vibration analysis based on near bit measurement data 7

Downhole vibration analysis based on near bit measurement da...

引用

7th International Conference on downhole Measurement and Control, ICdMC 2024

作者： Pang, Haibo Xu, Zhaohui Fang, Chao Fan, Jinchao Lin, Zili CNPC Engineering Technology R&D Company Limited China

The efficiency of down-hole drilling has always been a focus of attention in real time drilling field. With the number of deep and ultra deep wells increasing, real time drilling environment has become exceptionally complex, and the decrease of drilling efficiency has always been a difficult problem that troubles drilling field construction. The working status of bits is closely related to factors such as drilling parameters, drilling encountered lithology, and drilling tool wear. However, due to the limited working conditions underground, it is difficult to evaluate the working status of bit in a timely manner. In the article, by analyzing the near bit data measured by down-hole tools, we explore the vibration of drilling tools under different drilling conditions, analyze the vibration intensity of drilling tools at different time periods, statistically analyze the vibration types and intensities of drilling tools, and explore the correlation between drilling parameters, analyzing the impact of drilling parameters on drilling tool vibration. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Lithology

来源：评论

学校读者我要写书评

暂无评论

Study on Perforation Erosion in Hydraulically Fractured Shale Gas Wells Through downhole Video Imaging and Computational Fluid dynamic Modelling

Study on Perforation Erosion in Hydraulically Fractured Shal...

引用

2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Yuan, L. Hu, S.L. Mu, L.Y. Wang, d.L. Yang, X.T. CNPC Oilfield Service Company Limited China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781959025269

The limited-entry technology was a key technology in the multistage fracturing of shale oil and gas horizontal wells to help distribute fracture fluid among multiple perforation clusters evenly. However, perforations could be eroded and enlarged because of high-speed and continuous abrasion by the proppants, resulting in unequal inflow and uneven cracks propagation between perforation clusters, which caused low efficiency of the fracture treatment. Considering that the perforation erosion has not been fully understood yet, special attention should be paid to this aspect of research. In this work, post-fracturing perforations erosion images were collected by the downhole video imaging technology, which was employed to qualitatively analyze the geometrical morphology. Then, the erosion data (perforation diameter & perforation area) at different phases were utilized to quantitatively summarize the perforation erosion & chambering laws. Finally, perforation erosion models were built using computational fluid dynamics (CFd) to simulate the distribution of the flow field when high-speed fracturing fluid with proppants injected perforations, which would help interpret the analysis of the results. Based on above technics, the erosional pattern of perforation would be clearly revealed. One thousand and two perforation erosion images from medium to deep shale gas wells in Sichuan and Chongqing regions demonstrated that post-fracturing perforations appeared in four different geometrical morphology, including round (under-erosion, 10%), droplets (normal-erosion, 52%), near-droplets (over-erosion, 25%) and irregularity (abnormal-erosion,13%). due to the influence of the proppant concentration profile, perforations located near the downside of the horizontal wellbore suffered more severe erosion, for example, the most eroded perforation was near phase 180 degree with an average diameter of 18.4 mm which was 1.8 times larger than that of perforations near phase 0 degree (10.4 mm).

关键词： Proppants

来源：评论

学校读者我要写书评

暂无评论

Understanding hydraulic fracture propagation behavior in tight sandstone–coal interbedded formations: an experimentalinvestigation

引用

Petroleum Science 2019年第1期16卷 148-160页

作者： Peng Tan Yan Jin Liang Yuan Zhen-Yu Xiong Bing Hou Mian Chen Li-Ming Wan State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum CNPC Engineering Technology R&D Company Limited SINOPEC Shanghai O shore Oil & Gas Company

Whether hydraulic fractures could connect multiple gas zones in the vertical plane is the key to fracturing treatment to jointly exploit coalbed methane and tight sandstone gas through integrative hydraulic fracturing in tight sandstone–coal interbedded formations. Laboratory true triaxial hydraulic fracturing experiments were conducted on layered specimens with di erent combination types of natural sandstone and coal to simulate the propagation behavior of hydraulic fractures. The effects of the fracture initiation position, fracturing fluid viscosity and injection rate were discussed. The results showed that di erent fracture morphologies could be found. When initiating from coal seams, three patterns of fracture initiation and propagation were obtained:(1) The main hydraulic fracture initiated and propagated along the natural fractures and then diverged due to the effects of in situ stress and formed secondary fractures.(2) The hydraulic fracture initiated and propagated in the direction of the maximum horizontal stress.(3) Multiple fractures initiated and propagated at the same time. With the same fracturing fluid viscosity and injection rate, the hydraulic fractures initiating in sandstones had greater chances than those in coal seams to penetrate interfaces and enter neighboring layers. Excessively small or large fracturing fluid viscosity and injection rate would do harm to the vertical extension height of the induced fracture and improvement of the stimulated reservoir volume. Compared with operation parameters(fracturing fluid viscosity and injection rate), the natural weak planes in coals were considered to be the key factor that a ected the fracture propagation path. The experimental results would make some contributions to the development of tight sandstone–coal interbedded reservoirs.

关键词： Hydraulic fracturing Fracture propagation Sandstone-coal interbed Layered formation

来源：评论

学校读者我要写书评

暂无评论

Application of digital Twin for real-Time Early Identification and Warning of Pipe Stuck Using Hybrid Approach of Physics Model and Machine Learning

Application of Digital Twin for Real-Time Early Identificati...

引用

2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Zhang, Jiawei Huang, Hongchun Wang, Haige Wang, Qing Ji, Guodong Li, Hong CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025078

Pipe Stuck is one of the predominant causes for drilling-related non-productive time (NPT). According to statistics, losses up to hundreds of millions of dollars are caused by pipe stuck globally each year. Early identification and warning of pipe stuck are essential for predicting and avoiding stuck issue once preventive measures are taken promptly. Typical detecting methods based on data fluctuation amplitude or curve trends subject to expert user experience and human error. Moreover, pipe stuck usually have already happened in most cases when noticed by these methods. This paper presents an innovative system combing physics model with machine learning method, which enables automatically pipe stuck risk monitoring and warning while drilling. The new system combines these approaches: 1)real-time calculation of hook load, torque and standpipe pressure(SPP) for 9 different drilling states (rotary drilling, slide drilling, reaming, back-reaming, tripping in, tripping out and etc.) based on drill string mechanics and wellbore hydraulics model;2)The calculated parameters are checked and calibrated automatically within set computing cycle to narrow down calculation error;3) The deviation of actual parameters from theoretical modeled value and rate of change(rOC) of actual parameters are calculated and compared on time-series, based on which a pipe stuck risk index (PSrI) is proposed ranging from 0% to 100%;4) With different risk index ranges, pipe stuck risk level is monitored and evaluated as low (green), medium(yellow) and high(red) on real-time basis. For historical wells with and without pipe stuck issues under different drilling states, thresholds for deviation and rOC of parameters corresponding to different risk levels are obtained by random forest algorithm (rFA). The system is designed to provide users, driller or monitoring specialist a warning signal with prompt window jumping out and constant beep sound whenever a high-risk is identified. Once detected, preve

关键词： Infill drilling

来源：评论

学校读者我要写书评

暂无评论

A Novel Kick detection Tool Based on Knowledge-data-dual-driven Approaches

A Novel Kick Detection Tool Based on Knowledge-Data-Dual-Dri...

引用

2023 SPE Offshore Europe Conference and Exhibition, OE 2023

作者： Shi, Xiaoyan Cui, Meng Ji, Yong Wu, dong Guo, Weihong Jing, Lingzhi Tian, Yumeng Yang, Xinyi CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781613999936

recognizing abnormal fluid influx is the first and most important step for well control safety. However, due to the complexity of the wellbore fluid mechanism, uncertainty of the formation pressure and noises in the real-time measurement data, it is difficult to detect kicks by conventional approaches. The purpose of this paper is to propose a knowledge-data hybrid approach and build a reliable and easy-to-use tool to automatically detect kicks. Based on the knowledge of the kick main indicators, this work utilizes Long-Short moving window average algorithm combining advanced filtration technology to capture subtle change trends precisely and timely in noisy real-time measured surface data during drilling. Self-adaptive kick threshold value adopting approaches are proposed to improve the accuracy of kick detection for different data measuring technologies. The knowledge and inference logic of specific drilling operations and phenomena, such as wellbore ballooning effects and drilling fluid poring, are embedded in the data analysis technologies to reduce the false alarms of the kick detection system. A reliable and practical intelligent kick detection tool is built based on this knowledge-data-dual-driven method. The must-have input set of this tool only contains 8 channels, including pit volumes, outlet flowrate, stand pipe pressure, and etc, which makes the tool flexible and widely applicable. The tool consumes both real-time and archived drilling data, and provide audible and easy-to-understand visual alarms when kick is detected. Moreover, the tool supports different outlet flowrate measurement technologies, including Paddle meter, radar meter and Coriolis meter. Extensive testing process using historical data manifests that the kick detection rate is 100% (correctly detected 16 kicks out of total 16 kicks), and the overall detection time is 6.1 mins earlier comparing to that of conventional methods. The tool was also deployed in a real-time operation center for

关键词： Infill drilling

来源：评论

学校读者我要写书评

暂无评论

development of Sealing Joint for Collecting Slip ring 13th

Development of Sealing Joint for Collecting Slip Ring

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Qiao, Han Han, Fei Hu, Zhi-Jian Wang, Ai-Guo Cheng, Jin CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

The cable from the collecting slip ring is connected with the cable from the coiled tubing drum union, and the power supply from the surface to the downhole electric drilling tool and signal transmission are delivered via the cable passing through the coiled tubing. The high-pressure sealing at the coiled tubing drum and the reliable suspension of the cable inside the coiled tubing are two key factors affecting the safe and reliable operations of the coiled tubing electric drilling tool system. Given this, the sealing joint for collecting slip rings is developed for the annulus sealing and cable suspension of the coiled tubing-through cable near the bottom diameter of the drum. The tool is mainly composed of the bayonet, bayonet seat, sealing packing, upper joint and lower joint. The testing of the pressure bearing and suspension capacities of the tool shows that the developed sealing joint meets the requirements of 70 MPa sealing pressure and 10 ton cable suspension weight. The tool delivers high-pressure reliable sealing via "manual + packing" operations, and moreover, it offers a high suspension capacity by tightly clamping the separated armor steel wires of the cable. The development of this tool is of great significance to the safe and reliable operations of the surface coiled tubing drum for the coiled tubing electric drilling tool. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Electric power systems

来源：评论

学校读者我要写书评

暂无评论

Current Status and Trends in Shale Oil and Gas drilling engineering technology development at Home and Abroad

Current Status and Trends in Shale Oil and Gas Drilling Engi...

引用

International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Jing, Yu Bo, Zhou Pingliang, Fang Bing, Li Wenchao, Sun Long, Chang CNPC Engineering Technology R&D Company Limited Beijing China

Shale oil and gas is an important component of unconventional oil and gas, and the United States has achieved energy independence through the shale revolution. China has abundant unconventional oil and gas resources, and the vigorous development of shale oil and gas is a necessary path for the development of China's oil and gas industry. By systematically analyzing the developmental characteristics of shale oil and gas major countries, represented by North America, this study compares domestic and foreign shale oil and gas drilling engineering technologies from the perspectives of development process, well construction cycle, drilling parameters, and other aspects. It clarifies the advantages and challenges of Chinese shale oil and gas drilling engineering technology and provides targeted recommendations. The drilling mode for shale oil and gas in China has progressed from single horizontal wells to large-scale platform factory operations, significantly reducing costs and increasing efficiency. However, due to the complex geological conditions of shale formations and poor surface environment, China's shale oil and gas wells have a horizontal section length about 1000 meters shorter than those in North America, and the well construction cycle is 2-3 times longer. There are still certain gaps in drilling efficiency and operating costs compared to foreign countries. By systematically analyzing the development process and parameter characteristics of shale oil and gas drilling engineering technology at home and abroad, this study clarifies the current status of drilling engineering technology, providing references for the integration and promotion of mature technologies, demonstration of key core technology breakthroughs, and exploration of cutting-edge technology research and development. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Gas industry

来源：评论

学校读者我要写书评

暂无评论

Application of direct Torque Control (dTC) in the drilling System of Electric drilling Tool 13th

Application of Direct Torque Control (DTC) in the Drilling S...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, Ai-Guo Han, Fei Wang, Hong-Wei Qiao, Han CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

drilling system with electric drilling tool is one of key drilling technologies for the development of electric-driven drilling in the days to come, but the characteristics of rock cutting by downhole electric motor driving bit is significantly different from that of rock cutting by conventional rotary table and TdS driving drilling string to rotate the bit. downhole electric motor is highly effective with flexible control, which is incomparable for rotary table and TdS. However, due to the limit of downhole space size, downhole electric motor fails to reach the reserve of torque for rotary table and TdS;At the same time, the characteristics of rock cutting by bit is alternating load with high frequency and is greatly affected by the factors of the outside, such as WOB, rPM, and characteristics of rock cutting in the formation, which will make the situation worse for downhole electric motor with inadequate reserve of power;Thus it leads to the failure of realizing the running of bit at stable speed. So, to adapt to the characteristics of high frequency alternating load for the bit, control system of downhole electric motor is required to be provided with better performance of dynamic response. Based on the change of load characteristics, output torque of electric motor is timely adjusted to achieve the steady control of motor revolution speed. On the one hand, efficiency of rock cutting is improved, on the other hand, use life of bit is extended. This paper, through the comparison test of pilot performance for currently existing and more mature frequency converter of vector control mode without position, primarily verifies the mode of direct torque control (dTC) and control of permanent magnet synchronous motor by long-distance vector without position (1800 m) is achieved. Compared with conventional V/F ratio open-loop control mode, the higher performance of dynamic response is attained. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Torque

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：