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development of an Oil-Well downhole Behavior Classification Method Based on Pressure Parameters 1

13th International Field Exploration and development Conference, IFEdC 2023

作者： Feng, Xin Jia, Heng-Tian National Engineering Research Center of Oil and Gas Drilling and Completion Technology CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (数字)9789819704798

ISBN: (纸本)9789819704781

Automated processing of downhole engineering parameters and intelligent classification of working conditions play an important role in improving production efficiency and promoting the production process of oil fields. However, in the offline interpretation process of long-term downhole pressure parameters, the huge amount of data storage and uncertain downhole noise and interference can seriously affect and delay the interpretation of engineering parameters. At the same time, inaccurate and incomplete collection of downhole parameter feature extraction methods, improper selection, and optimization of downhole behavior classification mechanisms, etc., can seriously restrict the rapid and accurate extraction of pressure features, making the correct classification of downhole working conditions face greater challenges. In this paper, wavelet, time-domain, and gradient features of the downhole pressure parameters were extracted, and three methods including, neural network, support vector machine and K-nearest neighbor method, were used to classify the working conditions. By comparing the processing results under the interaction of different types of features and different behavior classification mechanisms, a classification method for downhole working conditions based on pressure parameters was optimized. The results show that the application of the optimal behavior classification method based on the optimal multi-feature has both small deviation in pressure parameters and high accuracy in working condition classification. This method provides a feasible data analysis method for downhole parameters. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Classification (of information)

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In-situ proppant: Beads, microproppant, and channelized-proppant

In-situ proppant: Beads, microproppant, and channelized-prop...

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Abu dhabi International Petroleum Exhibition and Conference 2019, AdIP 2019

作者： Huang, Jiangshui Gong, Wei Lin, Lijun Yin, Congbin Liu, Fuchen Zhou, Han Bai, Litao Song, Lulu Yang, Zhengzhou CNPC USA United States CNPC Chuanqing Drilling Engineering Company Ltd China CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781613996720

Tight oil reservoirs need stimulation in order to produce the trapped oil. The most common form of stimulation used by the oil and gas industry is hydraulic fracturing. Fracturing operations tend to create fractures including primary fractures and microfractures. The objective of this study is to develop a fracturing fluid which can be converted into microproppant, beads, and channelized-proppant as desired in-situ during a fracturing operation to enhance the hydraulic conductivity of the microfractures and the primary fractures, and simplify the hydraulic fracturing operation, where the channelized-proppant is defined as the pillars surrounded by channels. resin, curing agents, surfactants, and aqueous phase were mixed together to form O/W emulsion to serve as fracturing fluid. After curing process, resin and curing agent would react and form proppant in-situ. The parameters affect the proppant formation such as the curing temperatures, pressure, mixing strength, surfactant concentration, and size control additives were all studied and thus through controlling the parameters, microproppant, beads, and channelized-proppant can form in-situ as desired. The particle size distribution, sphericity, roundness, conductivity, acid solubility, and crush strength were tested. Through controlling the experimental parameters and adding size control additives, fracturing fluid can be converted into microproppant, beads, and channelized-proppant as desired at a temperature from 30° C to 90° C. Almost 100% of the resin and the curing agents were converted into proppant with a specific density of 1.09g/ml. For the beads, both the sphericity and roundness are over 0.9, less than 2% fines were generated after being loaded to 15 kpsi, the acid solubility is 2.37%, and the conductivity of the beads of 20/40 mesh tested with proppant loading of 1 lb/ft2 at 4000 psi at room temperature was 227 md-ft. For the microproppant, both the sphericity and roundness are close to 1 with d50 about

关键词： Particle size

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Characterization of carbonate rock fragmentation under torsional impact loading 58

Characterization of carbonate rock fragmentation under torsi...

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58th US rock Mechanics / Geomechanics Symposium 2024, ArMA 2024

作者： Xu, Zhaohui Ji, ran Fan, Jinzhao Shi, Huaizhong Fang, Chao Liu, dong Wang, Yongqi Song, Shaobo CNPC Engineering Technology R&D Company Limited China China University of Petroleum Beijing China Daqing Exploratory Drilling Engineering Company China

ISBN: (纸本)9798331305086

In order to study the influence of torsional impact technology on rock stress response, cutting force and other parameters of carbonate rock under different impact amplitude and impact frequency, the crushing test of carbonate rock was carried out by using the method of torsional impact assisted PdC bit, and the single-tooth rock crushing model under torsional impact was established, and the influence of different impact parameters on crushing efficiency was *** results show that under the condition of reasonable selection of torsional impact frequency and amplitude, torsional impact technology can effectively reduce the rock breaking torque and improve the rock breaking *** peak Mises stress increases by 42.3%,and the average cutting force of 1.5 times the amplitude is reduced by 10.6%.The research results are expected to provide a scientific basis for accelerating the drilling rate of carbonate rocks. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： rock mechanics

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Experimental research regarding the Flow Pattern and Pressure drop in a Slurry Composed of Polypropylene-Particles 9

Experimental Research Regarding the Flow Pattern and Pressur...

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9th International Conference on Advances in Machinery, Materials Science and engineering Applications, MMSE 2023

作者： Fan, Jinchao Xu, Zhaohui Fang, Chao Lin, Zili Cnpc Engineering Technology R&d Company Limited China National Engineering Research Center for Oil and Gas Drilling and Completion Technology China

ISBN: (纸本)9781643684383

Pipelines used for product transportation require regular cleaning. A new method has emerged using slurry for the cleaning process, during which the flow pattern and pressure drop in the slurry are essential. The flow of slurry containing polypropylene particles was investigated using a laboratory-scale, closed-circuit pipeline facility. While the slurry was pumped, the pressure drop was measured, and the flow pattern was observed regarding particle type, slurry particle concentration, and slurry flow velocity. The results showed that after the critical flow velocity, the particles mixed uniformly with the water in the pipe, increasing the pressure drop in conjunction with the flow velocity. Although a higher particle mass fraction and small particle size reduced the critical flow velocity, the mass fraction and particle size had no significant influence on the pressure drop. This research establishes a solid foundation for the practical application of this cleaning method. © 2023 The Authors.

关键词： Flow patterns

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Progress in the application of graphene material in oilfield chemistry:A review

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Petroleum 2024年第2期10卷 175-190页

作者： Jinsheng Sun Yuanwei Sun Yong Lai Li Li Gang Yang Kaihe Lv Taifeng Zhang Xianfa Zhang Zonglun Wang Zhe Xu Zhiwen dai Jingping Liu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Nanchong Vocational and Technical College Nanchong637131China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China CNPC Greatwall Drilling Fluids Company Panjin124000China

Graphene is a single atom thick crystal composed of carbon *** is the lightest,thinnest,strongest material that conducts heat and electricity well *** terms of application,by introducing oxygen-containing groups,graphene can be well dispersed in solvents,can be chemically modified and functionalized,or connected with other electroactive substances through covalent bond or non-covalent bond to form composite materials,which is conducive to further processing and *** application of graphene in oilfield chemistry started late,but developed *** has played an active role in drilling fluid,cementing fluid,fracturing fluid,displacement fluid and other oilfield working *** can enhance the temperature and salt resistance of working fluid and improve the effect of working *** this paper,several directions of graphene applications in oilfield chemistry,such as modified graphene,graphene copolymers and graphene nanoparticles,are reviewed in detail from the synthesis methods,action mechanisms and effects of graphene and its derivatives,and the frontier cases at this stage are *** the basis of the existing research,suggestions for the development direction of graphene materials in oilfield chemistry are given for a variety of graphene materials,aiming to provide guidance for the application of graphene in oilfield chemistry.

关键词： Oilfield chemistry Graphene Action mechanism Application Prospect

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A tight sandstone multi-physical hydraulic fractures simulator study and its field application

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Petroleum 2020年第2期6卷 198-205页

作者： Yonghong Wang Binshan Ju Shihao Wang Zhenzhou Yang Qing Liu School of Energy Resource China University of GeoscienceBeijingChina CNPC Engineering Technology R&D Company Limited(CPET) China Petroleum Engineering Department Colorado School of MinesGoldenCO80401USA

during the past years,the recovery of unconventional gas formation has attracted lots of attention and achieved huge *** produce gas from the low-permeability unconventional formations,hydraulic fracturing technology is essential and *** this paper,we present the development of a three-dimensional thermalhydraulic-mechanical numerical simulator for the simulation of hydraulic fracturing operations in tight sandstone *** simulator is based on integrated finite difference(IFd)*** this method,the simulation domain is subdivided into sub domains and the governing equations are integrated over a sub domain with flux terms expressed as an integral over the sub domain boundary using the divergence *** simulator conducts coupled thermal-hydraulic-mechanical simulation of the initiation and extension of hydraulic *** also calculates the mass/heat transport of injected hydraulic fluids as well as *** simulator is able to handle anisotropic formations with multiple *** simulator has been validated by comparing with an analytical solution as well as ribeiro and Sharma *** model can simulate fracture spacing effect on fracture profile when combining IFd with discontinuous displacement Method(ddM).

关键词： Tight sandstone Hydraulic fracture simulator Integrated finite difference discretization Stress contrast

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A New Environmental Friendly Oil-Based drilling Fluid 12th

A New Environmental Friendly Oil-Based Drilling Fluid

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Zhang, Jia-Qi Tao, Xie Yan, Li-Li Cheng, rong-Chao Wang, Jian-Hua Yang, Hai-Jun Ni, Xiao-Xiao CNPC Engineering Technology R and D Company Limited Beijing China Beijing China

ISBN: (纸本)9789819919635

A rapid evaluation method for the biodegradability of base oil was established. Through the research of the biodegradation law of base oil components, the core treatment agents such as emulsifier and filter loss reduction agent were further selected, and sodium acetate was used instead of calcium chloride in the internal phase to construct a new formulation of environmentally friendly oil-based drilling fluid. The comprehensive performance evaluation shows that the environmentally friendly oil-based drilling fluid system has good performance such as bio-non-toxic, biodegradable, and heavy metal content, etc. The soil is mixed with the oil-based drilling fluid in the ratio of 8:2 by weight, which can ensure normal plant growth and achieve the purpose of resource recycling. With a temperature resistance of 160 ℃ and a density of up to 2.2 g/cm3, the performance can satisfy the construction of shale oil and gas horizontal wells and can be operated in blocks with high environmental requirements. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Biodegradability

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research Progress and development Trend of Treatment Methods for Annular Pressure in Gas Storage Caverns

Research Progress and Development Trend of Treatment Methods...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Liu, Wei Zhang, Wenyao Zha, Chunqing Xu, Chaohui CNPC Engineering Technology R&D company limited China China University of Petroleum Beijing China Beijing University of Technology China

In recent years, pressure in the annulus of gas storage reservoir injection wells has become increasingly common. This presents a significant challenge to the safe and efficient operation of gas storage reservoirs and the integrity of injection wells. This paper presents a systematic introduction to the prevention and control measures of annular pressure. The introduction is based on research into the development status of prevention and control methods both domestically and internationally. The measures mainly include two aspects. Firstly, for the sealing failure of the tubular column, the differential pressure activated blocking agent is used for management. Secondly, for the sealing failure of the cement ring, the sealing agent is managed by extruding cement, resin, and other blocking agents. The text analyses the advantages and disadvantages of the treatment technology in depth, in combination with existing research. The repair methods for gas storage reservoir annulus with pressure have problems such as insufficient construction conditions, poor implementation effect, and limited types of blocking agents available. Additionally, the different working conditions and performances of the reservoir annulus are taken into account. To ensure high efficiency and cost-effectiveness, we propose a new method for treating annulus pressure. This involves repairing any damage to the cement ring, restoring the production packer's seal, and rebuilding the integrity of the old wellbore. By doing so, we can guarantee the safety of gas storage reservoirs throughout the entire injection and production life cycle. It is important to maintain the integrity of the old wellbore to ensure the safety of gas storage during injection and extraction. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Cements

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Treatment technology of brine contamination and barite settlement for the high temperature and high density OBM for ultra-deep well drilling in western China

Treatment technology of brine contamination and barite settl...

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International Petroleum technology Conference 2019, IPTC 2019

作者： Wang, Jianhua Yan, Lili Liu, Fengbao Yang, Haijun Yin, da Xu, Xianguang CNPC Engineering Technology R and D Company limited China Petrochina Tarim Oilfield Company China

ISBN: (纸本)9781613996195

due to the existence of extremely high temperature, high pressure thick evaporite bed and brine layer, Kuqa piedmont structure has been identified as one of the most complicated drilling regions in the world which locates in Tarim Basin of China. In Keshen Block the occurrence rate of high pressure brine invasion during the drilling progress is high up to 56%, and barite in OBM mud is easy to settle under high temperature and longtime static conditions. Therefore, brine invasion and barite settlement are serious challenges for ultra-deep wells drilling in Western China. Increasing the density of mud is one method to deal with brine invasion during drilling, but lost circulation is easy to be caused. Another method is discharge the brine in batches to reduce the high pressure of brine layer, which requests the higher brine capacity of OBM. In this instance, a new emulsifier used in OBM was compounded to enhance the emulsifying efficiency through the increase the number of hydrophilic group on single emulsifier molecular structure. The experiment results indicated that the ability of OBM tolerance to brine contamination is higher than 60%. The instrument for evaluating the sedimentation rate of OBM at high temperature (200°C) and high pressure (20MPa) has been developed. The experiment results indicated that increasing rM6 value could improve the stability of settlement. Well KS1101 encountered lost circulation and high pressure brine layer in the same horizon, the safety density window of the drilling fluid is almost zero. Thus, the method of brine discharge in batches was used to reduce the brine layer pressure to ensure the drilling safety. A total of 1129.98m3 brine was discharged by 64 times of drainage and avoided the lost circulation. The rheology of OBM is stable, and the brine water capacity of the drilling fluid system is more than 45%. Throughout the drilling process, there was no downhole complex occurred. This OBM system has been wildly used in Keshen Blo

关键词： Infill drilling

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Study on Annular Pressure Buildup Occurring in the Production String in dual Packer Completion Offshore Heavy Oil Wells 13th

Study on Annular Pressure Buildup Occurring in the Productio...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, Hao Zhang, Hui Li, Mu Hao, Wei-Wei Li, Ya-Fei Zhang, Xin Zou, Yi CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering China University of Petroleum Beijing China

ISBN: (纸本)9789819702596

With the continuous development of unconventional resources, offshore heavy oil has attracted wide international attention. Heat fluid huff and puff and dual packer completion technology are often used in offshore heavy oil production. However, the annular pressure buildup caused by heat transfer and fluid expansion in the production has become a serious problem. It has brought a great threat to safe production of heavy oil. In this paper, regarding the dual packer completion and N2 injection, the temperature field in the production string is analyzed based on the heat transfer theory and energy conservation. The prediction method of APB is proposed considering the influence of the axial force and the cemented casing on the annular volume. At last, the mechanical strengths of the tubing and casing strings are evaluated. Analysis results indicate APB in C-annular is higher than that in the other annuli. The bottom of the un-cemented section of each string is most likely to be of failure. With the increase of N2 injection, APB decreases at a declining rate. The comparisons between the calculated value of APB by the proposed method and the measured data show high consistency with prediction errors less than 10%. The model developed in this paper is of referential value for annular pressure buildup mitigation and optimizing cementing operation. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Heavy oil production

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