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Data-driven model for predicting production periods in the SAGD process

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Petroleum 2022年第3期8卷 363-374页

作者： Ziteng Huang Min Yang Bo Yang Wei Liu zhangxin chen Department of Chemical and Petroleum Engineering University of Calgary2500 University Drive NWCalgaryT2N 1N4Canada

Many studies have analyzed the cumulative production performance in the SAGD(steam assisted gravity drainage)process by data-driven models but a study based on these models for a dynamic analysis of a SAGD production period is still *** is important for engineers to define the production period in a SAGD process as it has a stable and high oil production rate and engineers need to reset operational conditions after the production period *** this paper,a series of SAGD models were constructed with selected ranges of reservoir properties and operational *** SAGD production period parameters,including the start date,end date,and duration,are collected based on the simulated production *** neural network,extreme gradient boosting,light gradient boosting machine,and catboost were constructed to reveal the hidden relationships between twelve input parameters and three output *** data-driven models were trained,tested,and *** results showed that compared with the other output parameters,the R^(2) of the end date is the highest and it becomes higher with a larger training data *** extreme gradient boosting algorithm is a better choice to predict the Start date while the artificial neural network generates better prediction for the other two output *** study shows a significant potential in the use of data-driven models for the SAGD production dynamic *** results also serve to support the utilization of the datadriven models as efficient tools for predicting a SAGD production period.

关键词： Steam assisted gravity drainage Data-driven model Artificial neural network Extreme gradient boosting Light gradient boosting machine CatBoost

Editorial for the Special Issue on Unconventional and Intelligent Oil and Gas Engineering

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Engineering 2022年第11期18卷 1-2页

作者： Gensheng Li Jinsheng Sun zhangxin chen Zhenhua Rui State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China China National Petroleum Corporation Beijing 100007China Department of Chemical and Petroleum Engineering University of CalgaryCalgaryAB T2N 1N4Canada

A key global challenge in the 21st century is how to secure sustainable access to energy for a growing global population—set to reach 10 billion by 2035—while coping with the threat of dangerous climate *** oil and gas industry will still play an essential role in the energy transition by providing affordable and reliable energy to improve living ***,producing this energy with decreasing emissions supports a net-zero world.

关键词： global dangerous providing

Numerical Simulation of Compositional Flow in Porous Media under Gravity

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Communications in Computational Physics 2006年第5期1卷 827-846页

作者： zhangxin chen Guoqiang(Joe)Zhou Dan Carruthers Center for Scientific Computation Southern Methodist UniversityDallasTX 75275-0156USA Research Center for Science Xi’an Jiaotong UniversityXi’an 710049P.R.China Center for Advanced Reservoir Modeling and Simulation College of EngineeringPeking UniversityP.R.China The Permedia Research Group 577 Somerset St.W.OttawaOntario K1R 5K1Canada

This paper is concerned with the numerical simulation of multiphase,multi-component flow in porous *** model equations are based on compositional flow with mass interchange between *** compositional model consists of Darcy’s law for volumetric flow velocities,mass conservation for hydrocarbon components,ther-modynamic equilibrium for mass interchange between phases,and an equation of state for ***-accurate finite volume methods on unstructured grids are used to discretize the model governing *** emphasis is placed on studying the influence of gravitational effects on the overall displacement *** particular,free and forced convections,diffusions,and dispersions are studied in separate and com-bined cases,and their interplays are intensively analyzed for gravitational *** numerical experiments are presented to validate the numerical study under consideration.

关键词： Compositional model reservoir simulation finite volume method unstructured grids gravitational effect free and forced convections diffusions dispersions numerical experiments

A new framework for selection of representative samples for special core analysis

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Petroleum Research 2020年第3期5卷 210-226页

作者： Abouzar Mirzaei-Paiaman Seyed Reza Asadolahpour Hadi Saboorian-Jooybari zhangxin chen Mehdi Ostadhassan National Iranian South Oil Company(NISOC) Department of Petroleum EngineeringAhvazIran Now at State University of Campinas(UNICAMP) CampinasSPBrazil Department of Chemical and Petroleum Engineering Schulich School of EngineeringUniversity of CalgaryCanada Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Ministry of EducationNortheast Petroleum University

Special core analysis(SCAL)measurements play a noteworthy role in reservoir *** to the time-consuming and costly character of these measurements,routine core analysis(RCAL)data should be inspected thoroughly to select a representative subset of samples for *** are no comprehensive guidelines on how representative samples should be *** this study,a new framework is presented for selection of representative samples for *** foundation of this framework is using methods of PSRTI,FZI*(FZI-star)and TEM-function for the early estimation of petrophysical static,dynamic,and pseudo-static rock types at RCAL *** global hydraulic element(GHE)approach is benefitted and a FZI*-based GHE method(i.e.,GHE*)is presented for partitioning *** framework takes into consideration different laboratory,reservoir engineering,geological,petrophysical and statistical factors.A carbonate reservoir case is presented to support our *** also show that the current forms of Lorenz and Stratigraphic Modified Lorenz Plots in reservoir engineering are not appropriate,and present new forms of them.

关键词： RCAL SCAL Sample selection Rock typing TEM-Function

Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction

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Geoscience Frontiers 2021年第4期12卷 93-109页

作者： Xiongqi Pang chengzao Jia Wenyang Wang zhangxin chen Maowen Li Fujie Jiang Tao Hu Ke Wang Yingxun Wang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Exploration&Development Research Institute China National Petroleum CorporationBeijing 100724China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Chemical and Petroleum Engineering Schulich School of EngineeringUniversity of CalgaryCalgary T2N 1N4Canada State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China

The discovery of unconventional hydrocarbon resources since the late 20th century changed geologists’understanding of hydrocarbon migration and accumulations and provides a solution to energy *** 2016,unconventional oil production in the USA accounted for 41%of the total oil production;and unconventional natural gas production in China accounted for 35%of total gas production,showing strong growth momentum of unconventional hydrocarbons *** hydrocarbons generally coexist with conventional petroleum resources;they sometimes distribute in a separate system,not coexisting with a conventional *** and prediction of unconventional resources and their potentials are prominent challenges for *** study analyzed the results of 12,237 drilling wells in six representative petroliferous basins in China and studied the correlations and differences between conventional and unconventional hydrocarbons by comparing their geological *** and accumulation of conventional hydrocarbon are caused dominantly by *** a concept of buoyance-driven hydrocarbon accumulation depth to describe the deepest hydrocarbon accumulation depth driven dominantly by buoyance;beyond this depth the buoyance becomes unimportant for hydrocarbon *** found that the buoyance-driven hydrocarbon accumulation depth in petroliferous basins controls the different oil/gas reservoirs distribution and resource *** migration and accumulations above this depth is dominated by buoyancy,forming conventional reservoirs in traps with high porosity and permeability,while hydrocarbon migration and accumulation below this depth is dominated by non-buoyancy forces(mainly refers to capillary force,hydrocarbon volumeexpansion force,etc.),forming unconventional reservoirs in tight *** buoyance-driven hydrocarbon accumulation depths in six basins in China range from 1200mto 4200 m,which become shallowerwith

关键词： Nature energy Fossil energy Oil and gas resources Conventional hydrocarbon reservoirs Unconventional hydrocarbon reservoirs Buoyance-driven hydrocarbon accumulation depth

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页岩气纳米孔真实气体传输模型

中国科学：技术科学 2016年第1期46卷 68-78页

作者：吴克柳李相方 chen zhangxin 中国石油大学(北京)石油工程学院北京102249 Department of Chemical and Petroleum Engineering University of Calgary

页岩富含纳米孔,纳米孔气体传输不同于宏观流体流动.基于滑脱流动和克努森扩散两种传输机理,分别以分子之间碰撞频率和分子与壁面碰撞频率占总碰撞频率的比值作为滑脱流动和克努森扩散的权重系数,耦合这两种机理,建立了理想气体传输模型... 详细信息

页岩富含纳米孔,纳米孔气体传输不同于宏观流体流动.基于滑脱流动和克努森扩散两种传输机理,分别以分子之间碰撞频率和分子与壁面碰撞频率占总碰撞频率的比值作为滑脱流动和克努森扩散的权重系数,耦合这两种机理,建立了理想气体传输模型.同时考虑高压条件下真实气体分子间相互作用力和气体分子自身体积对气体传输的影响,建立了页岩纳米孔真实气体传输模型.模型可靠性通过分子模拟结果验证.结果表明:纳米孔真实气体传输模型能够更合理地描述所有的气体传输机理,包括连续流动、滑脱流动和过渡流动;真实气体效应对气体传输的影响可高达23%,其受压力、温度、纳米孔尺度和气体类型的控制;在室内实验条件下模拟页岩纳米孔气体传输时,用氦气代替甲烷,低估了甲烷的传输能力65.09%;用氮气代替甲烷,高估了甲烷的传输能力106.27%.

关键词：页岩气纳米孔真实气体滑脱流动克努森扩散

Optimization of Vertical Well Placement by Using a Hybrid Particle Swarm Optimization

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Wuhan University Journal of Natural Sciences 2011年第3期16卷 237-240页

作者： DONG Xiaojian WU Zhijian DONG Chao chen zhangxin WANG Hui State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 Hubei China Department of Chemical and Petroleum Engineering University of Calgary Calgary Alberta Canada

Locating wells is an important step in oil exploitation. This paper proposes a novel approach, which first combines particle swarm optimization, genetic algorithm, and a reservoir simulation evaluation tool to optimize the locations of vertical wells. Simulation results show that the convergence efficiency of our approach outperforms traditional genetic algorithm and overcomes the disadvantage of particle swarm algorithm that would be easily trapped into best-at-local solution so that its optimization result has been significantly improved.

关键词： well location optimization particle swarm optimization genetic algorithm (GA) global optimization

A unified model for the formation and distribution of both conventional and unconventional hydrocarbon reservoirs

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Geoscience Frontiers 2021年第2期12卷 695-711页

作者： Xiongqi Pang chengzao Jia Junqing chen Maowen Li Wenyang Wang Qinhong Hu Yingchun Guo zhangxin chen Junwen Peng Keyu Liu Keliu Wu State Key Laboratory of Petroleum Resources and Prospecting Beijing 102249China College of Geosciences China University of Petroleum-BeijingBeijing 102249China Exploration&Development Research Institute China National Petroleum CorporationBeijing 100724China College of Science China University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Chemical and Petroleum Engineering Schulich School of EngineeringUniversity of CalgaryCalgary T2N 1N4Canada The University of Texas at Arlington ArlingtonTX 76019USA Institue of Geomechanics China Academy of Geological ScienceBeijing 100081China Bureau of Economic Geology University of Texas at AustinAustin TX 78713USA CSIRO Energy 26 Dick Perry AveKensingtonWA 6151Australia

The discovery and large-scale exploration of unconventional oil/gas resources since 1980s have been considered as the most important advancement in the history of petroleum geology;that has not only changed the balance of supply and demand in the global energy market,but also improved our understanding of the formation mechanisms and distribution characteristics of oil/gas ***,what is the difference of conventional and unconventional resources and why they always related to each other in petroliferous basins is not *** the differences and correlations between unconventional and conventional resources are complex challenging issues and very critical for resources assessment and hydrocarbon exploration,this paper focused on studying the relationship of formations and distributions among different oil/gas *** results of 12,237 exploratory wells in 6 representative petroliferous basins of China and distribution characteristics for 52,926 oil/gas accumulations over the world were applied to clarify the formation conditions and genetic relations of different oil/gas reservoirs in a petroliferous basin,and then to establish a unified model to address the differences and correlations of conventional and unconventional *** this model,conventional reservoirs formed in free hydrocarbon dynamic field with high porosity and permeability located above the boundary of hydrocarbon buoyancy-driven accumulation depth *** tight reservoirs formed in confined hydrocarbon dynamic field with low porosity and permeability located between hydrocarbon buoyancy-driven accumulation depth limit and hydrocarbon accumulation depth *** oil/gas reservoirs formed in the bound hydrocarbon dynamic field with low porosity and ultra-low permeability within the source rock *** than 75%of proved reserves around the world are discovered in the free hydrocarbon dynamic field,which is estimated to contain only 10%of originally gen

关键词： Fossil fuels Hydrocarbon resources Unified model of reservoirs formation Hydrocarbon reservoirs Hydrocarbon accumulation Hydrocarbon dynamic field

Unified Analysis of the Hybrid Form of Mixed Finite Elements for Second Order Elliptic Problems

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工程数学学报 1991年第2期8卷 91-102页

作者： zhangxin chen Department of Mathematics, Purdue University, W. Lafayette, IN 47907, U.S.A

In this paper we systematically analyze the hybrid form of two mixed methods, the Raviart= Thomas and Brezzi-Douglas-Marini methods, for second order elliptic equations. We directly show that the hybrid form of the mixed methods is stable with respect to the usual Sobolev norms by means of the abstract stability theory for mixed methods, and thus error estimates in these norms can be obtained in a simple manner. We also introduce a new postprocessing method for improving the scalar variable as an alternative to the usual postprocessing methods.

关键词：数学学报工程月山