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Characteristics and Mechanism of Upper Permian reef reservoirs in the Eastern Longgang Area, Northeastern Sichuan Basin, China

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Petroleum 2020年第2期6卷 130-137页

作者： Lei Tan Hong Liu Yuzhe Tang Bing Luo Ya Zhang Yuran Yang Yisha Liao Weifeng du Xiran Yang School of Geosciences and Technology Southwest Petroleum UniversityChengdu610500China Beijing Petroleum Machinery Co. CNPC Engineering Technology R&D Company LimitedBeijing102206China The Institute of Exploration and Development of Southwest Oil and Gas Field Branch PetroChinaChengdu610059China Chongqing Gas Field Southwest Oil&Gas Field CompanyPetroChinaChongqing400021China Bureau of Geophysical Prospecting China National Petroleum Corp Zhuozhou072750China Northwest Sichuan Gas Field Southwest Oil&Gas Field CompanyPetroChinaJiangyou621709China

As a typical kind of lithologic reservoirs,reef reservoirs are generally featured by their large single-well reservoir thickness,good reservoir physical properties,and high gas well *** Upper Permian Changxing Formation is an important natural gas exploration target in the Sichuan Basin,which hosts a large reef gas reservoir and is mainly distributed along the Kaijiang-Liangping *** analyses are implemented to investigate reservoir characteristics and identify controlling factors of reef reservoirs in Changxing Formation in the Eastern Longgang Area,Northeastern Sichuan Basin,including core,logging,and seismic data *** Formation reservoirs in the study area mainly occur in the reef-shoal complex,which are featured by wide distribution,large thickness and generally good physical *** rocks are dominantly composed of bioclastic dolomite and silty-fine dolomite(with grain phantom structure),while the main reservoir space consists of residual intergranular pores,intergranular dissolution pores,and karst *** the seismic profiles,typical mound-shaped chaotic reflections can be clearly *** is suggested by the main reservoir development controlling factor analysis that the distributions of reef reservoirs are typically controlled by sedimentary facies belts,while the scale of the reef-shoal complex is determined by the pene-sedimentary *** can not only significantly preserve the primary pores but also enhance the permeability of ***,karstification is the key to high-quality reef-shoal reservoirs.

关键词： Changxing formation reef reservoir characteristics Essential factors Eastern longgang

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Sealing analysis of cement plug in offshore abandoned wells 20th

Sealing analysis of cement plug in offshore abandoned wells

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20th Chinese Materials Conference, CMC 2019

作者： Tang, Geng Yan, Hui Li, Jun Song, Xuefeng Zhang, Xin Guo, Xueli Petro China Southwest Oil & Gasfield Company Chengdu610000 China China University of Petroleum-Beijing Beijing102249 China China University of Petroleum-Beijing at Karamay Karamay834000 China CNOOC Safety Technology Service Co. Ltd. Tianjin 300450 China CNPC Engineering technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9783035715668

A three-dimensional finite element model of stratum-cement ring-casing-cement plug was established for the failure analysis of the cement plug seal in the abandoned oil and gas wells. The mechanical parameters, length, bottom fluid pressure and casing swaging length of the cement plug under non-uniform ground stress conditions were analyzed. The results showed that when the bottom of the cement plug was subjected to fluid pressure, the stress at the interface between the cement plug and the casing increased, and thereby the cement plug at the bottom and the cementation of the casing failed, resulting in a the decrease in the sealing performance of the cement plug, which may be sealed under fluid corrosion. As the modulus of elasticity and the radius of the cement plug increased, the cement plug stress and the cement failure length increased. As the cement plug length increased, the cement plug stress and the cement failure length decreased, while Poissons ratio for the cem ent plug stress and the cement failure length increased. The increase of the bottom fluid pressure could increase the cement plug stress and the cementation failure length. In the abandoned well, where the casing was forged and then grinded after the casing was forged, the length of the casing milling increased, the plug stress of cement reduced. These findings can provide insightful potentials for the parameters of cement plugs when the cement plugs are closed in the offshore oil and gas wells. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Cements

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research on Weight-on-bit Self-adjusting dual-diameter PdC Bit design and Effect Evaluation Utilizing Stress-releasing Effect of rock at Bottomhole

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Arabian Journal for Science and engineering 2021年第7期46卷 6925-6937页

作者： Hu, Huaigang Guan, Zhichuan Wang, Bin Lu, Baoping Chen, Weiqing Xu, Yuqiang Liu, Yongwang CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum (East China) Qingdao China Shandong Ultra-Deep Drilling Process Control Tech R&D Center Qingdao China Qingdao Refining and Chemical Co. LTD Qingdao China Sinopec Research Institute of Petroleum Engineering Beijing China King Fahd University of Petroleum and Minerals (KFUPM) Dhahran Saudi Arabia

rock-breaking efficiency is not so satisfied using the conventional PdC bit, especially in the hard, soft–hard interbedded, and strong abrasive formations in ultra-deep wells. A method is proposed to make full use of stress-releasing effect at bottomhole, thereby improving the rock-breaking efficiency, and a supporting weight-on-bit (WOB) self-adjusting dual-diameter PdC bit (WSdB) has been invented. The WSdB can dynamically adjust the depth-of-cut control characteristics, which could improve the rate of penetration (rOP) while mitigating the stick–slip vibration caused by the rapid change of depth of cut. The stress field of the rock at the bottomhole is calculated with a numerical method, and the working mechanism of the bit is analyzed. The application effect of the WSdB is evaluated through laboratory tests preliminarily. The results show that the stress concentration area on the shoulder of the reaming bit is decreased obviously and a larger stress unloading area emerges in the intersection between reaming and pilot bit. Thus, mechanical specific energy (MSE) can be greatly reduced when the reaming bit drills into this section. Indoor tests show that the maximum rOP of WSdB can be reached up to 70% higher compared to the conventional PdC bit, and higher rOP could be obtained with a relatively lower bit torque. With drilling parameters greater than the critical revolution and WOB, the reduction in MSE can be reached up to 36% during the rock-breaking process. Making further efforts into the optimization of bit structure to reduce the vibration intensity is expected to achieve more improved bit performance.

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IoT-driven defect detection System for Plastic recycling Plants Based on Convolutional Neural Networks

IoT-Driven Defect Detection System for Plastic Recycling Pla...

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Self Sustainable Artificial Intelligence Systems (ICSSAS), International Conference on

作者： Priyanka Madhiraju rajeshkumar Sampathrajan Manjula Pattnaik P. rajalakshmi K. dhivya S. Murugan Department of Computer Science and Engineering Matrusri Engineering College Hyderabad Telangana India McKinsey & Company Fort Worth Texas USA Accounting Department College of Business and administration Princess Nourah Bint Abdulrahman University Saudi Arabia Department of Computer Science and Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Chennai Tami Nadu India Department of Electronics and Communication Engineering SRM Institute of Science and Technology Kattankulathur Chennai Tamil Nadu India Department of Biomedical Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Saveetha University Chennai Tamil Nadu India

ISBN: (数字)9798350368413

ISBN: (纸本)9798350368420

To improve the accuracy of plastic recycling facilities this paper introduces an Internet of Things (IoT)driven defect detection system that uses Convolutional Neural Networks (CNNs). Traditional techniques of fault identification are time-consuming and prone to human error, which makes plastic recycling less than ideal from an environmental sustainability perspective. To track the movement of plastics in real time, the system makes use of IoT sensors placed all throughout the recycling facility. To correctly detect plastic material flaws like contamination, discoloration, or physical damage, this data is then input into a CNNs model that has been tuned for image analysis. The proposed system outperforms conventional approaches in terms of efficiency and accuracy of flaw identification, as shown by rigorous testing. This method improves the quality and longevity of plastic recycling operations while simultaneously streamlining defect identification procedures via the use of IoT technology and CNNs. The IoT presents exciting new methods to lessen the negative effects of plastic recycling facilities on the environment while simultaneously increasing their efficiency and effectiveness, meeting the growing demand for environmentally friendly waste management solutions throughout the world.

关键词： Fault diagnosis Quality control Sensor systems real-time systems recycling Sensors Plastics Convolutional neural networks Contamination defect detection

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A new tEdFM-based analysis of interference characterization in tight gas reservoir

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Energy 2025年 330卷

作者： Tang, Zekai Chen, Zhiming Han, Jiapeng Zhao, Xin Chen, Zhaowei Tan, Peng State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum at Beijing Beijing102249 China Hildebrand Department of Petroleum and Geosystems Engineering The University of Texas at Austin AustinTX78712 United States CNPC Engineering Technology R&D Company Limited Beijing102249 China

Tight gas reservoirs are a key component of the global unconventional energy supply, yet their development is significantly challenged by inter-well interference. Quantitative methods for analyzing interference are scarce, and existing models often rely on idealized fracture assumptions. This study presents an inter-well interference model for tight gas reservoirs with complex fracture networks using the transient embedded discrete fracture model (tEdEM). The model incorporates heterogeneous hydraulic fractures, stochastic natural fractures, and coupled interflow between matrix and fracture systems, while considering reservoir stress sensitivity and gas-water two-phase flow. Four conceptual interference models are established based on fracture connectivity: matrix (Type I), natural fracture (Type II), hydraulic fracture (Type III), and hydraulic fracture-wellbore interference (Type IV). The degree of production interference (dPI) is defined as a quantitative measure. Sensitivity analysis shows that stress sensitivity and hydraulic fracture half-length significantly impact interference. An actual case study in the ZT tight gas block demonstrates intermediate interference (dPI = 0.11) due to natural fracture interactions. This study enhances the understanding of inter-well interference mechanisms, provides strategies to mitigate interference, and supports sustainable unconventional gas production. © 2025 Elsevier Ltd

关键词： Petroleum reservoir evaluation

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Fracture hits analysis for parent-child well development 53

Fracture hits analysis for parent-child well development

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53rd U.S. rock Mechanics/Geomechanics Symposium

作者： Anusarn, Sangnimnuan Li, Jiawei Wu, Kan Wang, Yonghong Shi, Xiaozhi Yin, Congbin Li, Yanchao Texas A and M University College StationTX United States CNPC Engineering Technology R and D Company Limited Beijing China CNPC Chuanqing Drilling Engineering Co. Ltd Chengdu China

during the progression from Hold By Production to infill drilling, operators usually encounter the frac hits and cause communication between parent and infill wells. Well communication is often detrimental to both parent and infill wells. However, the mechanisms of frac hits have not been thoroughly studied. Hence, to optimize parent-infill well development, we will study fracture propagation in infill wells and investigate frac hits between infill and parent wells. We have developed an efficient coupled fluid flow and geomechanics model to characterize stress change in reservoirs with complex fracture geometry. The reservoir geomechanics model will be used to characterize spatial and temporal evolution of stress state due to depletion of the parent well. Based on updated heterogeneous reservoir stress state, an in-house hydraulic fracture model is used to simulate dynamic fracture propagation in infill wells and investigate frac hits. The results indicate that an unfavorable fracture geometry is generated in infill wells. Pressure sink induced by depletion decreases the magnitude of reservoir principle stresses. Hence, fractures in the infill well tend to propagate toward the depleted region of the parent well and generate an unsymmetrical fracture geometry in the two sides of the infill well, resulting in fracture hits. Furthermore, pressure sink also changes the orientation of principle stresses, which induce fractures in the infill well changing propagation direction and hitting pre-existing fractures in the parent well. This paper will help understand mechanisms of parent well production loss and lower-than-expected production rate of infill wells. This work can also provide critical insights to mitigating frac hits for parent-infill well development and well spacing optimization. Copyright 2019 ArMA, American rock Mechanics Association.

关键词： Fracture

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Missing recognition of highway shading board based on deep convolution segmentation and correction

Missing recognition of highway shading board based on deep c...

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2022 IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2022

作者： dong, Yuanshuai Zhang, Yanhong Hou, Yun Tong, Xinlong Wu, Qingquan Zhou, Zuofeng Cao, Yuxuan China Highway Engineering Consulting Group Company Ltd Beijing100089 China China Communications Construction Company Ltd Research and Development Center on Highway Pavement Maintenance Technology Beijing100089 China R. and D. Ctr. of Transp. Indust. of Technol. Mat. and Equip. of Hwy. Construction and Maintenance Beijing100089 China Key & Core Technology Innovation Institute of the Greater Bay Area Guangzhou510530 China Cas Industrial Development Co. Ltd Xi'an Institute of Optics and Precision Mechanics Xi'an710000 China

ISBN: (纸本)9781665409025

The lack of highway shading panels poses a major hidden danger to driving safety. It is urgent to study a method that can automatically detect the disease of the anti-glare panel and provide help for the maintenance of traffic safety auxiliary facilities. In the method for identifying the absence of shading panels on highways based on deep convolutional image segmentation and correction, the Pointrend model based on deep convolutional networks (CNN) is first used to achieve the pixel-level fine segmentation of the shading plate area, and then the multiple images in the same image are segmented. A shading plate area, on the largest outer polygon estimated by the convex hull algorithm, the optimal outer quadrilateral is determined according to the distance between the vertices, and then the shading plate area correction is completed by affine transformation, and finally through the image one-dimensional projection mapping and adjacent shading The distance correlation between the boards realizes the identification and positioning of the missing light-shielding board. The highway shading plate missing recognition method based on deep convolution image segmentation and correction uses the vertex distance to quickly determine the external quadrilateral, which is suitable for estimating the shape of the area in a dynamic scene. After actual testing and verification, it can accurately and efficiently identify the disease of the anti-glare plate. Compared with traditional image segmentation methods, the method using the Pointrend target segmentation model has better segmentation quality for target details, and it is more robust when dealing with background interference. © 2022 IEEE.

关键词： Convolution

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An extended finite element method for hydro-mechanically coupled analysis of mud loss in naturally fractured formations 53

An extended finite element method for hydro-mechanically cou...

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53rd U.S. rock Mechanics/Geomechanics Symposium

作者： Xia, Yang Jin, Yan Huang, Zhao Lu, Yunhu Wang, Hanqing State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum Beijing China CNPC Engineering Technology R and D Company Limited Beijing China

In computational simulations of drilling mud flow in fractured formations, consideration of interactions between the fracture networks and the porous rock requires an appropriate coupling procedure from the local fractures to the scale of typical finite elements in poromechanics problems. A hydro-mechanically coupled model is developed in this paper to characterize drilling mud flow in naturally fractured formations. Especially, the mud leak-off from fractures into the matrix is described by a new method. The finite element equations are derived for the model and integrated over time. By exploiting the partition-of-unity property of the finite element shape functions, the position and direction of the fractures are independent from the underlying discretization. The resulting discrete equations are non-linear due to the non-linearity of the leak-off effect, and the Newton–raphson method is used to solve the nonlinear equations. Simulation results show that the fracture deformation and leak-off effect both have significant impacts on mud loss volume, especially the expansion of the fracture network due to mud invasion can further increase the cumulative mud loss volume. The presented model improves the accuracy of the mud loss prediction, and thereby results in a more realistic characterization of naturally fractured reservoirs. Copyright 2019 ArMA, American rock Mechanics Association.

关键词： Fracture

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Study on the effect of oligomer silicone surfactant on the properties of drilling fluids

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

作者： Jie Zhang Long Li Nanxing Xie Xuyang Yao Zhiliang Zhao CNPC Engineering Technology R&D Company Limited Beijing 102206 China PetroChina Southwest Oil & Gas Field Company China PetroChina Xinjiang Oil & Gas Field Company China

due to small hole roar, most of low-permeability gas reservoirs are water wetting, and the capillary effect is very prominent, resulting in water blocking damage in the process of exploitation for natural gas. A new kind of oligomer silicone surfactant (OSSF) was developed, and the physical and chemical properties of oligomer silicone surfactant were evaluated. The experimental results indicated that the critical micelle concentration of OSSF was 0.418×10-3 mol/L, and the critical surface tension of OSSF was 20.631 mN/m. OSSF could be adsorbed directionally at the water-rock pore interface, and the cores adsorbed with OSSF should reverse from water wetting to oil wetting or gas wetting. OSSF had good compatibility with sulphonated polymer mud. OSSF could play an important role in unlocking water blocking damage to increase production and efficiency.

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Study on operation strategy of aquifer underground gas storage using CO2 as cushion gas

Study on operation strategy of aquifer underground gas stora...

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Carbon Management technology Conference 2019, CMTC 2019

作者： Mu, Lingyu Liao, Xinwei Yu, Qiang Hao, Litao Zhang, Jingtian Zhao, Jinglei Wu, Jiaqi Beijing China PetroChina Changqing Oilfield Company Xi'an China Petro China Jidong Oilfield Company Tangshan China CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9781613997246

The cushion gas is indispensable to maintain the reservoir pressure, prevent the water intrusion and ensure the stability of underground gas storage (UGS). Considering the good thermodynamic properties, economic benefit and carbon storage, CO2 is the ideal option for the cushion gas. However, it is inevitable that the cushion will mix with the working gas during the operation of gas storage, which reduces the thermal enthalpy and even changes the pressure dynamics of the reservoir. It is important to research how to control the injection of CO2 to operate the UGS *** paper demonstrates the feasibility of CO2 as the cushion gas and develops an operation strategy for aquifer UGS. The numerical simulation method with consideration of the effect of the dissolution of CO2 in water and the diffusion between the gases is adopted to model the injection and production process of UGS with CO2 as cushion gas. Firstly, the feasibility of CO2 is demonstrated through the analyses of physical properties and mixing characteristics of CO2 and CH4. Then, the dynamics of UGS is analyzed and the influential factors are discussed. Eventually, the optimum operation strategy is recommended. This work can provides a better understanding of the dynamics of UGS and a scientific basis for the efficient operation of gas storage and production. This paper demonstrates the feasibility of CO2 as the cushion gas, and develops an operation strategy for aquifer UGS, which provides a scientific basis for the efficient operation of gas storage. © 2019 Carbon Management technology Conference 2019, CMTC 2019. All rights reserved.

关键词： Carbon dioxide

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