检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Zhang, Yuda Yuan, Guangjie dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

UGS is the key place to ensure the stable supply of natural gas, and the plugging effect of old wells will be seriously affected due to its characteristics of strong and alternating injection and withdrawal. In order to study the plugging of old wells with fishing and buried by sediment, a full-scale wellbore sediment sealing simulation experiment and a small-scale core permeability experiment were designed. Considering the factors such as sediment composition, compaction degree and metal surface roughness, the compaction law of fillers and the change law of permeability with rock cuttings content under different top hydraulic conditions were analyzed. The experimental results show that there are two kinds of sealing failure in old wells. One is gas breakthrough, the breakthrough pressure difference is 1.3-2.7 MPa, the breakthrough time is about 30 s, and the dominant channel is the interface between sediment and casing and fishing. The other is gas leakage. The permeability range of the sediment is 0.0024-0.031 d, and the reservoir gas flows along the pore channel of the sediment. This study simulates the sediment plugging old wells in the range of gas storage site, and provides reference for the sealing failure process and mechanism of old wells. © 2024, The Authors. All rights reserved.

关键词： Sediments

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research on the method of dynamic PdC cutters distribution 5

Research on the method of dynamic PDC cutters distribution

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5th International Conference on Energy engineering and Environmental Protection, EEEP 2020

作者： Peng, Qi Zhou, Yingcao Yang, Xiongwen Liu, Yu Cheng, Chris CNPC Engineering Technology R and D Company Limited Beijing China Research Institute of Petroleum Exploration and Development Beijing China CNPC USA Corporation HoustonTX United States

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. © Published under licence by IOP Publishing Ltd.

关键词： Lithology

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A comprehensive case study on lost circulation of Changqing Mizhi Block in perspective of geomechanics 56

A comprehensive case study on lost circulation of Changqing ...

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56th U.S. Rock Mechanics/Geomechanics Symposium

作者： Li, Xingbao Ban, Fansheng Zhu, Yujie Luo, Jiangwei Chen, Shaoyun Jin, Sheng Che, Zhenhua dong, Jingnan The Second Gas Production Plant of Petro China Changqing Oilfield Company Yulin China CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum Beijing China Drilling Engineering Technology Research Institute Daqing Drilling and Exploration Engineering Company Daqing China Petroleum Engineering Research Institute of Dagang Oilfield Tianjin China Sinopec Zhongyuan Oilfield Engineering Service Management Center Henan China

ISBN: (纸本)9780979497575

drilling mud loss is of crucial importance in drilling. Lost circulation will extend the well construction period, cause investment losses, and even cause serious downhole accidents. In the Mizhi block of Changqing Oilfield targeted by this research, serious leakage occurred in many wellbore drilling processes, which has seriously affected the development of the block and caused economic losses. This paper focuses the mud loss during the drilling process of more than 200 wells in the Mizhi block, and counts the key loss data such as the lost horizons, the amount of lost drilling fluid, the average leak rate, and the density of the drilling fluid, and fully analyzes the possible reasons of the lost circulation. Collecting logging data, modeling geomechanics of some key wells and formations and taking cores. Finally, the geomechanical model is established. Analyzing the logging data and the specific leakage situation, the leakage mainly comes from fracture, and the leakage horizons mainly locate at the bottom of the Liujiagou Formation, the entire interval of the Shiqianfeng Formation and the top of the Shihezi Formation. Most of the mud loss sections are sand-mudstone interbeds. Geomechanical analysis shows that the rock mechanical strength of the entire interval is difficult to support the stability of the wellbore under the drilling fluid density of 1.1 grams per cubic meter, but the block loss pressure is generally between 1.1-1.2 grams per cubic meter. Collapse and leakage coexist in the wellbore. This study gives the method of drilling fluid optimization, and gives the possible reasons for the leakage from the perspective of geomechanics, which has important guiding significance for the further development of the Mizhi block. © 2022 ARMA, American Rock Mechanics Association.

关键词： drilling fluids

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Influence of Fractures on CO2 Huff-n-Puff Effect of Staged Fractured Horizontal Wells in Tight Oil Reservoirs 11th

Influence of Fractures on CO2 Huff-n-Puff Effect of Staged F...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Zhou, Tuo Zhong, Zhao Chen, Chi Yang, Hui Xiao, Yue Baletabieke, Bahedaer Kong, Xiang-ji Zhou, Chuan Xiang, Ying Gao, Qing-yun Tian, Yajie CNPC Engineering Technology R&D Company Limited Beijing China Exploration Division PetroChina Southwest Oil and Gasfield Company Chengdu China China Petroleum Technical Service Corporation Limited Beijing China China National Oil and Gas Exploration and Development Company Ltd. Beijing China Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789811921483

Tight oil has become a new growth point for global oil and gas reserves and production. Conventional tight oil reservoirs are mainly developed in depletion mode, and water flooding cannot effectively supplement formation energy. CO2 has strong advantages in terms of elasticity, mutual solubility with crude oil, etc., and is considered to be an effective way to supplement energy. At present, staged fracturing of horizontal wells has gradually become the main development method for tight oil reservoirs, but it still fails to meet production requirements. In this paper, taking the Chang 8 tight oil reservoir in the Ordos Basin as an example, it is the first time to use a combination of physical simulation and numerical simulation, and use an original large-scale physical simulation experiment system to focus on the impact of fractures on the CO2 huff-n-puff effect of staged fractured horizontal wells in tight oil reservoirs. Through the original large-scale physical simulation experiment system (which can simulate a 50 * 50 * 6 cm core), using a combination of physical simulation and numerical simulation to analyze the impact of fractures on the CO2 huff-n-puff effect of horizontal wells with staged fracturing. Studies have shown that fracture length and fracture density are the main controlling factors that affect the CO2 huff-n-puff effect of staged fracturing horizontal wells, and reasonable fracture parameters are the key to improving development efficiency. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Fracture

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

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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

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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...

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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

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Co-training Semi-supervised Learning Algorithm for Classification of Seismic Facies of Carbonate Tidal Channels 11th

Co-training Semi-supervised Learning Algorithm for Classific...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Wang, Ru-yi Wang, Zhi-zhang Yang, Xiang-Tong Xu, Zhen-yong Guo, Fa-jun Downhole Operation Research Department CNPC Engineering Technology R&D Company Limited Beijing China College of Geosciences China University of Petroleum-Beijing Beijing China Research Institute of Petroleum Exploration and Development Beijing China Research Institute of Exploration and Development PetroChina Hua Bei Oilfield Company Shangqiu China

ISBN: (纸本)9789811921483

This primary goal of this study was to improve the accuracy of seismic identification of carbonate tidal channels and to achieve quantitative characterization of seismic facies. This paper is the first to present a co-training semi-supervised learning algorithm for use with seismic and drilling data to identify the sedimentary microfacies patterns of tidal channels within carbonate reservoirs. Co-training is a semi-supervised machine learning algorithm by which the feature dataset is split into two subsets, and a classifier is established for each feature subset. Each subset is re-trained based on the classification results of the other subset until the same classification results are obtained for most of the data in the two subsets. Taking the Mb1-3 subzone of the Mishrif Formation, West Qurna Oilfield-1 (Iraq) as an example, we employed zero-crossing-wrapping method to extract 18 seismic attributes of the target zone. The sliding window method was used to optimize 12 seismic attributes, and a hierarchical clustering algorithm based on correlation coefficients was used to group these seismic attributes. Using the two seismic attribute groups as feature data, we employed logistic regression, decision tree, and the k-nearest neighbor classifiers to conduct co-training semi-supervised learning for the classification and identification of tidal channels and lagoons. The results showed that the co-training semi-supervised learning algorithm improved the accuracy rate of each classifier, reduced background noise and clutter signals, and enhanced the continuity of the plane distribution of the tidal channel prediction results. In summary, the co-training semi-supervised learning algorithm significantly improved the efficiency of seismic facies identification of tidal channels. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Learning algorithms

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research on Network Application of Intelligent Campus Based on SdN technology

Research on Network Application of Intelligent Campus Based ...

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Image Processing and Computer Applications (ICIPCA), IEEE International Conference on

作者： Yunyi Mei Qi Shao Qingzhong Gao Tong Zhao Yanlong Zhang Lingzhi Jing Yang Yu CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China Kunlun Digital Technology Co. Ltd. Beijing China CNPC Great Wall Drilling Company Beijing China

There are some problems in traditional network architecture, such as traffic can not be real-time scheduling, business information can not be visualized, operation and maintenance is complex, and fault location efficiency is low. In order to meet the needs of “digital Petroleum” network infrastructure construction, a company introduced SdN technology into the campus office network, and carried out network optimization management and innovation practice, this paper puts forward a network transformation scheme based on SdN “The network follows the people”, through deploying SdN control server and adjusting the network equipment configuration, the office network can be expanded flexibly and maintained efficiently, to meet the needs of different types of application traffic classification management and intelligent precision scheduling, effectively improve the level of intelligent network management.

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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...

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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

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Flow numerical simulation of tubing or casing leakage in gas well

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

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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

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