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Intelligent production optimization method for a low pressure and low productivity shale gas well
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作者 ZHU Qikang LIN Botao +2 位作者 YANG Guang WANG Lijia CHEN Man 《Petroleum Exploration and Development》 CSCD 2022年第4期886-894,共9页
Shale gas wells frequently suffer from liquid loading and insufficient formation pressure in the late stage of production.To address this issue,an intelligent production optimization method for low pressure and low pr... Shale gas wells frequently suffer from liquid loading and insufficient formation pressure in the late stage of production.To address this issue,an intelligent production optimization method for low pressure and low productivity shale gas well is proposed.Based on the artificial intelligence algorithms,this method realizes automatic production and monitoring of gas well.The method can forecast the production performance of a single well by using the long short-term memory neural network and then guide gas well production accordingly,to fulfill liquid loading warning and automatic intermittent production.Combined with adjustable nozzle,the method can keep production and pressure of gas wells stable automatically,extend normal production time of shale gas wells,enhance automatic level of well sites,and reach the goal of refined production management by making production regime for each well.Field tests show that wells with production regime optimized by this method increased 15%in estimated ultimate reserve(EUR).Compared with the development mode of drainage after depletion recovery,this method is more economical and can increase and stabilize production effectively,so it has a bright application prospect. 展开更多
关键词 shale gas low pressure and low productivity gas well production optimization artificial intelligence long short-term memory neural network adjustable nozzle
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Numerical study on gas production via a horizontal well from hydrate reservoirs with different slope angles in the South China Sea
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作者 Tingting Luo Jianlin Song +5 位作者 Xiang Sun Fanbao Cheng Madhusudhan Bangalore Narasimha Murthy Yulu Chen Yi Zhao Yongchen Song 《Deep Underground Science and Engineering》 2024年第2期171-181,共11页
It is important to study the effect of hydrate production on the physical and mechanical properties of low-permeability clayey–silty reservoirs for the largescale exploitation of hydrate reservoirs in the South China... It is important to study the effect of hydrate production on the physical and mechanical properties of low-permeability clayey–silty reservoirs for the largescale exploitation of hydrate reservoirs in the South China Sea.In this study,a multiphysical-field coupling model,combined with actual exploration drilling data and the mechanical experimental data of hydrate cores in the laboratory,was established to investigate the physical and mechanical properties of low-permeability reservoirs with different slope angles during 5-year hydrate production by the depressurization method via a horizontal well.The result shows that the permeability of reservoirs severely affects gas production rate,and the maximum gas production amount of a 20-m-long horizontal well can reach186.8 m3/day during the 5-year hydrate production.Reservoirs with smaller slope angles show higher gas production rates.The depressurization propagation and hydrate dissociation mainly develop along the direction parallel to the slope.Besides,the mean effective stress of reservoirs is concentrated in the near-wellbore area with the on-going hydrate production,and gradually decreases with the increase of the slope angle.Different from the effective stress distribution law,the total reservoir settlement amount first decreases and then increases with the increase of the slope angle.The maximum settlement of reservoirs with a 0°slope angle is up to 3.4 m,and the displacement in the near-wellbore area is as high as2.2 m after 5 years of hydrate production.It is concluded that the pore pressure drop region of low-permeability reservoirs in the South China Sea is limited,and various slope angles further lead to differences in effective stress and strain of reservoirs during hydrate production,resulting in severe uneven settlement of reservoirs. 展开更多
关键词 effective stress low‐permeability reservoirs natural gas hydrate production numerical simulation SETTLEMENT slope angle the South China
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Numerical Simulation of Oil and Gas Two-Phase Flow in Deep Condensate Gas Reservoirs in Bohai Buried Hills
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作者 Zhennan Gao Xianbo Luo +2 位作者 Lei Zhang Qi Cheng Yingxu He 《Open Journal of Applied Sciences》 2023年第11期2068-2079,共12页
The BZ19-6 gas field is characterized by high temperature and high pressure (HTHP), high condensate content, little difference between the formation pressure and dew point pressure, and large amount of reverse condens... The BZ19-6 gas field is characterized by high temperature and high pressure (HTHP), high condensate content, little difference between the formation pressure and dew point pressure, and large amount of reverse condensate liquid. During the early stage of depletion development, the production gas-oil ratio (GOR) and production capacity remain relatively stable, which is inconsistent with the conventional reverse condensate seepage law. In view of the static and dynamic conflict in development and production, indoor high-temperature and high-pressure PVT experiment was carried out to reveal the mist-like condensation phenomenon of fluids in the BZ19-6 formation. And the seepage characteristics of condensate gas reservoirs with various degrees of depletion under the condition of HTHP were analyzed based on production performance. The change rule of fluid phase state was analyzed in response to the characterization difficulties of the seepage mechanism. The fluid state was described using the miscible mechanism. And the interphase permeability interpolation coefficient was introduced based on interfacial tension. By doing so, the accurate characterization of the “single-phase flow of condensate gas-near-miscible mist-like quasi single-phase flow-oil-gas two-phase flow” during the development process was achieved. Then the accurate fitting of key indicators for oilfield development was completed, and the distribution law of formation pressure and the law of condensate oil precipitation under different reservoir conditions are obtained. Based on research results, the regulation strategy of variable flow rate production was developed. Currently, the work system has been optimized for 11 wells, achieving a “zero increase” in the GOS of the gas field and an annual oil increase of 22,000 cubic meters. 展开更多
关键词 High Temperature and High pressure Condensate gas Reservoirs Mist Flow Characterization of Seepage Flow History Match Production Regulation
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Design and theoretical analysis of test system for propellants' gas pressure in warhead
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作者 边晶晶 武震 《Journal of Measurement Science and Instrumentation》 CAS 2014年第1期10-14,共5页
Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 i... Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 is designed in order to acquire gas pressure during cluster bombs dispersion.To meet the requirement of low power consumption,the working states of system's modules during data acquisition are elaborated and the equation to calculate the gas pressure change during cylindrical center tube opening the hatch is deduced.The field test is conducted and good test results are obtained. 展开更多
关键词 warhead dispersion center tube explosion dispersion gas pressure storage test and measurement low power consumption
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Prediction of Flowing Bottomhole Pressures for Two-Phase Coalbed Methane Wells 被引量:5
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作者 LIU Xinfu 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第5期1412-1420,共9页
A method is proposed to predict the flowing bottomhole pressures (FBHPs) for two-phase coalbed methane (CBM) wells. The mathematical models for both gas column pressure and two-phase fluid column pressure were dev... A method is proposed to predict the flowing bottomhole pressures (FBHPs) for two-phase coalbed methane (CBM) wells. The mathematical models for both gas column pressure and two-phase fluid column pressure were developed based on the well liquid flow equation. FBHPs during the production were predicted by considering the effect of entrained liquid on gravitational gradients. Comparison of calculated BHPs by Cullender-Smith and proposed method was also studied. The results show that the proposed algorithm gives the desired accuracy of calculating BHPs in the low- productivity and low-pressure CBM wells. FBHP is resulted from the combined action of wellhead pressure, gas column pressure and fluid column pressure. Variation of kinetic energy term, compressibility and friction factors with depth increments and liquid holdup with velocity should be considered to simulate the real BHPs adequately. BHP is a function of depth of each column segment. The small errors of less than 1.5% between the calculated and measured values are obtained with each segment within 25 m. Adjusting BHPs can effectively increase production pressure drop, which is beneficial to CBM desorption and enhances reservoir productivity. The increment of pressure drop from 5.37 MPa2 to 8.66 MPa2 leads to an increase of CBM production from 3270 m3/d to 6700 m3/d and is attributed to a decrease in BHP from 2.25 MPa to 1.33 MPa. 展开更多
关键词 coalbed methane productivity flowing bottomhole pressure gas column pressure two-phase fluid column pressure
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Mixture Preparation and Combustion of CNG Low-Pressure Compound Direct Injection Spark-Ignited Engines
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作者 胡春明 侯圣智 +4 位作者 詹樟松 刘斌 刘娜 于勇 宋玺娟 《Transactions of Tianjin University》 EI CAS 2011年第6期411-417,共7页
A set of compressed natural gas (CNG) multi-point direct injection system of spark-ignited engines and the corresponding measurement and data acquisition systems were developed in this paper. Based on different inject... A set of compressed natural gas (CNG) multi-point direct injection system of spark-ignited engines and the corresponding measurement and data acquisition systems were developed in this paper. Based on different injection modes, the mixture formation and combustion of CNG low-pressure direct injection (LPDI) engines were studied under varying factors such as air/ fuel ratio, injection timing. Meanwhile, three-dimensional simulations were adopted to explain the mixture formation mechanisms of CNG low-pressure compound direct injection (LPCDI) mode. On the basis of test results and simulation of the mixture homogeneous degree, the conception of injection window was proposed, and the LPCDI mode was proved to be more beneficial to the mixture concentration stratification formation in cylinder under lean-burning conditions, which resulted in effective combustion and stability. 展开更多
关键词 compressed natural gas (CNG) engine mixture homogeneous degree injection timing low pressure compound direct injection (LPCDI)
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A new method to calculate the productivity index for vertical fractured well of tight gas reservoir
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作者 Li Junjian Jiang Hanqiao +1 位作者 Gao Huimei He Yingfu 《Engineering Sciences》 EI 2008年第3期93-96,共4页
Generally the irreducible water saturation of low permeability gas reservoir is quite high which leads to the permeability stress sensibility and threshold pressure gradient. Under the assumption that permeability var... Generally the irreducible water saturation of low permeability gas reservoir is quite high which leads to the permeability stress sensibility and threshold pressure gradient. Under the assumption that permeability varies with experimental law of the pseudo pressure drop, according to concepts of perturbable ellipses and equivalent developing regulations, the calculation method of stable production of hydraulically fractured gas well in low permeability reservoirs is investigated with threshold pressure. And productivity curve is drawn and analyzed. The result shows that, permeability modulus and threshold pressure have effect on production of fractured gas well. The higher the permeability modulus and the threshold pressure, the lower the production is. Therefore, the impact of stress sensitive and threshold pressure must he considered when analyzing the productivity of vertical fracture well in low permeability gas reservoir. 展开更多
关键词 tight gas reservoir stress sensitive threshold pressure vertical fracture well productivity analysis
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Preparation and characterization of LPPS NiCoCrAlYTa coatings for gas turbine engine 被引量:4
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作者 洪瑞江 周克崧 +2 位作者 王德政 朱晖朝 邝子奇 《中国有色金属学会会刊:英文版》 CSCD 2001年第4期567-571,共5页
NiCoCrAlYTa coatings have been deposited onto an aircraft gas turbine engine blade using a LPPS unit equipped with a computerized robot. Optimal processing conditions, including spray parameters, the trajectory of the... NiCoCrAlYTa coatings have been deposited onto an aircraft gas turbine engine blade using a LPPS unit equipped with a computerized robot. Optimal processing conditions, including spray parameters, the trajectory of the robot, and the synchronized movements between the torch and the blade, have been developed for superior coating properties. Transferred arc treatment, providing a preheating and a cleaning of the substrate surface, enhances the adherence of the coatings to the substrate. The resulting LPPS coatings show dense and uniform characteristics with ideal hardness, and good corrosion resistance to cycle oxidation. 展开更多
关键词 low pressure plasma spraying hot corrosion COATING gas turbine engine MCRALY
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Progress and prospects of oil and gas production engineering technology in China 被引量:2
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作者 ZHENG Xinquan SHI Junfeng +4 位作者 CAO Gang YANG Nengyu CUI Mingyue JIA Deli LIU He 《Petroleum Exploration and Development》 CSCD 2022年第3期644-659,共16页
This paper summarizes the important progress in the field of oil and gas production engineering during the"Thirteenth Five-Year Plan"period of China,analyzes the challenges faced by the current oil and gas p... This paper summarizes the important progress in the field of oil and gas production engineering during the"Thirteenth Five-Year Plan"period of China,analyzes the challenges faced by the current oil and gas production engineering in terms of technological adaptability,digital construction,energy-saving and emission reduction,and points out the future development direction.During the"Thirteenth Five-Year Plan"period,series of important progresses have been made in five major technologies,including separated-layer injection,artificial lift,reservoir stimulation,gas well de-watering,and workover,which provide key technical support for continuous potential tapping of mature oilfields and profitable production of new oilfields.Under the current complex international political and economic situation,oil and gas production engineering is facing severe challenges in three aspects:technical difficulty increases in oil and gas production,insignificant improvements in digital transformation,and lack of core technical support for energy-saving and emission reduction.This paper establishes three major strategic directions and implementation paths,including oil stabilization and gas enhancement,digital transformation,and green and low-carbon development.Five key research areas are listed including fine separated-layer injection technology,high efficiency artificial lift technology,fine reservoir stimulation technology,long term gas well de-watering technology and intelligent workover technology,so as to provide engineering technical support for the transformation,upgrading and high-quality development of China’s oil and gas industry. 展开更多
关键词 oil and gas production engineering separated-layer injection artificial lift reservoir stimulation gas well de-watering WORKOVER digital transformation low carbon economy
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Structural integrity evaluation of irradiated LEU targets for the production of molybdenum‑99 using thermo‑mechanical behavior simulation coupled with pressure of fission gas release calculation
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作者 N.Mellel B.Mohammedi +3 位作者 M.Salhi M.Dougdag S.Missaoui S.Hanini 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第12期12-23,共12页
Irradiated low-enriched uranium as target plates is used to produce,via neutron radiation and from the molybdenum-99 fission product,technetium-99m,which is a radio-element widely used for diagnosis in the field of nu... Irradiated low-enriched uranium as target plates is used to produce,via neutron radiation and from the molybdenum-99 fission product,technetium-99m,which is a radio-element widely used for diagnosis in the field of nuclear medicine.The behavior of this type of target must be known to prevent eventual failures during radiation.The present study aims to assess,via prediction,the thermal–mechanical behavior,physical integrity,and geometric stability of targets under neutron radiation in a nuclear reactor.For this purpose,a numerical simulation using a three-dimensional finite element analysis model was performed to determine the thermal expansion and stress distribution in the target cladding.The neutronic calculation results,target material properties,and cooling parameters of the KAERI research group were used as inputs in our developed model.Thermally induced stress and deflection on the target were calculated using Ansys-Fluent codes,and the temperature profiles,as inputs of this calculation,were obtained from a CFD thermal–hydraulic model.The stress generated,induced by the pressure of fission gas release at the interface of the cladding target,was also estimated using the Redlich–Kwong equation of state.The results obtained using the bonded and unbonded target models considering the effect of the radiation heat combined with a fission gas release rate of approximately 3%show that the predicted thermal stress and deflection values satisfy the structural performance requirement and safety design.It can be presumed that the integrity of the target cladding is maintained under these conditions. 展开更多
关键词 Irradiated LEU target Mo-99 production Integrity evaluation Thermo-mechanical analyses Fission gas pressure
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Development of a pressure coring system for the investigation of deep underground exploration
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作者 Da Guo Ling Chen +8 位作者 Zhongya Zhou Dingming Wang Yiwei Zhang Xun Yang Xin Fang Xiaojun Wang Heping Lu Lin Dai Heping Xie 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第11期1351-1364,共14页
To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoretical analyse... To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoretical analyses and numerical simulation.The designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 MPa.The results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the pressure.Additionally,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was proven.Furthermore,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was verified.This study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration. 展开更多
关键词 Underground exploration In-situ coring pressure coring Oil and gas production
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低压低产气井排水采气工艺技术分析 被引量:1
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作者 赵一心 孟遥 +1 位作者 李洋 李泽 《石化技术》 CAS 2024年第3期185-186,181,共3页
低压低产气井是指井底流体压力较低、产气量相对较小的天然气井。这类气井常存在着排水和采气难度大的问题,因为井底压力低和产气量小导致气体上升能力不足,使得天然气无法顺利上升到地面。基于此,分析低压低产气井排水采气的工艺特点,... 低压低产气井是指井底流体压力较低、产气量相对较小的天然气井。这类气井常存在着排水和采气难度大的问题,因为井底压力低和产气量小导致气体上升能力不足,使得天然气无法顺利上升到地面。基于此,分析低压低产气井排水采气的工艺特点,并对低压低产气井排水采气工艺进行技术分析,提高采气效率。 展开更多
关键词 低压低产气井 排水采气 工艺技术
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珠江口盆地古近系典型低渗透油藏产能测试分析 被引量:1
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作者 赵义强 万钧 +2 位作者 罗启源 郑圣黠 周路遥 《石化技术》 CAS 2024年第2期202-203,247,共3页
珠江口盆地古近系低渗透储层具有孔隙度低、孔隙结构复杂、喉道细小等特点,探井钻杆测试(DST)测试产能低。对比分析模块式地层动态测试器(MDT)取样分析结果及关井压力恢复资料,发现储层在测试前浸泡时间长,产生较为严重的水锁效应。剖... 珠江口盆地古近系低渗透储层具有孔隙度低、孔隙结构复杂、喉道细小等特点,探井钻杆测试(DST)测试产能低。对比分析模块式地层动态测试器(MDT)取样分析结果及关井压力恢复资料,发现储层在测试前浸泡时间长,产生较为严重的水锁效应。剖析低渗透储层产生水锁效应的机理,推导出泥浆滤液侵入储层深度的公式,结果表明泥浆滤液侵入储层深度与浸泡时间呈正相关关系,针对区域深层低渗透油藏因水锁效应而导致的风险,提出措施建议。 展开更多
关键词 珠江口盆地 低孔低渗 水锁伤害 毛管压力 产能测试
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Investigation of low water recovery based on gas-water two-phase low-velocity Non-Darcy flow model for hydraulically fractured horizontal wells in shale 被引量:1
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作者 Yong He Jianjun Wang +4 位作者 Xiaoqing Huang Yue Du Xiang Li Wenshu Zha Daolun Li 《Petroleum》 EI CSCD 2023年第3期364-372,共9页
Various mechanisms are employed to interpret the low water recovery during the shale-gas production period,such as extra-trapped water in the fracture network,water imbibition due to osmotic pressure and capillary pre... Various mechanisms are employed to interpret the low water recovery during the shale-gas production period,such as extra-trapped water in the fracture network,water imbibition due to osmotic pressure and capillary pressure.These lead to the difficulty of water flow,which could be described by lowvelocity non-Darcy's law known as threshold pressure gradient(TPG).In this paper we firstly employ the low-velocity non-Darcy's law to describe the water flow and use Darcy flow accounting for slip flow and free molecular flow mechanisms to model gas flow in the shale formation.The sensitive study using numerical simulation shows that the proposed flow model could model the low fracturing liquid recovery and that large pseudo TPG leads to lower fracturing liquid recovery.Thus,the proposed model would give new insight to model the low water recovery in shale formations. 展开更多
关键词 low water recovery low-velocity non-Darcy flow Pseudo threshold pressure gradient Hydraulically fractured horizontal wells Shale gas
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基于外部绿色压力的农业碳减排行为研究
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作者 柯春媛 黄世政 《华东经济管理》 北大核心 2024年第3期74-83,共10页
农业“双碳”目标的实现需要新型农业经营主体参与碳减排。文章基于PSR模型,探讨农业碳减排行为的前因后果、交互作用、生成机理,并验证高层环境认知的调节效果。研究以问卷调查方式收集广东省新型农业经营主体的284份数据样本,采用结... 农业“双碳”目标的实现需要新型农业经营主体参与碳减排。文章基于PSR模型,探讨农业碳减排行为的前因后果、交互作用、生成机理,并验证高层环境认知的调节效果。研究以问卷调查方式收集广东省新型农业经营主体的284份数据样本,采用结构方程式进行分析验证。研究发现:政府压力、市场压力、社会压力对新型农业经营主体的碳减排行为和意愿均具有显著正向影响,且对其碳减排意愿具有中介作用;高层环境认知在市场压力、社会压力与碳减排意愿间的调节作用显著,但对政府压力与碳减排意愿间的调节效果不显著。新型农业经营主体应借助于市场压力、社会压力和政府压力推进碳减排行为,实现可持续发展。 展开更多
关键词 低碳生产行为 新型农业经营主体 政府压力 市场压力 社会压力 高层环境认知
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变压吸附实验装置的小型化、低成本化改进
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作者 李清骊 行甜雨 +1 位作者 杨钰欣 王卓鹏 《大学化学》 CAS 2024年第1期173-177,共5页
目前的变压吸附实验中通常使用商品化设备,存在尺寸大、成本高、气路复杂等问题,不利于大规模开展本科实验教学。本文对变压吸附装置进行了小型化、低成本化改进,学生可以使用实验室常见材料自行搭建变压吸附装置,了解并掌握设备搭建、... 目前的变压吸附实验中通常使用商品化设备,存在尺寸大、成本高、气路复杂等问题,不利于大规模开展本科实验教学。本文对变压吸附装置进行了小型化、低成本化改进,学生可以使用实验室常见材料自行搭建变压吸附装置,了解并掌握设备搭建、调试、运行的整个流程。以Li交换分子筛作为吸附剂,该设备的制氧效果与商用制氧机相当,出口氧气浓度可达95.8%。该装置具有安全性高、可反复拆装的特点,搭建、调试过程具有一定趣味性,适合用于应用化学、化学工程等本科专业的变压吸附实验教学,有利于激发学生对创制实验装置的兴趣,锻炼学生的动手能力,提高学生理论结合实际解决问题的能力。 展开更多
关键词 变压吸附 小型装置 低成本 制氧 本科实验教学
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考虑压力敏感及流体黏度的致密油藏动用半径
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作者 姜永 吴浩君 +1 位作者 高振南 杨晨旭 《油气井测试》 2024年第3期8-12,共5页
常用的低渗透致密油藏动用半径计算方法未考虑地层渗透率和流体黏度的变化,影响了结果的准确性。建立考虑启动压力梯度、渗透率及原油黏度随地层压力变化的致密油藏动用半径计算模型,并采用数值分析的迭代法对模型进行了求解,分析启动... 常用的低渗透致密油藏动用半径计算方法未考虑地层渗透率和流体黏度的变化,影响了结果的准确性。建立考虑启动压力梯度、渗透率及原油黏度随地层压力变化的致密油藏动用半径计算模型,并采用数值分析的迭代法对模型进行了求解,分析启动压力梯度、压力敏感系数、黏度变形系数、生产压差等关键参数对油井动用半径的影响。结果表明,启动压力梯度越大,流体的非线性流动越强,油井动用半径越小;随着生产压差的增大动用半径增大,同时,压力敏感系数对动用半径的影响也越来越大;黏度变形系数越大,导致渗流阻力增加,油井动用半径越小。研究成果应用于BZ油田开发方案制定,确定合理生产压差为8~10 MPa,合理注采井距约为200~250 m。该方法对于低渗透致密油藏开发方案制定具有一定指导意义。 展开更多
关键词 致密油藏 动用半径 启动压力梯度 压力敏感效应 黏度变形系数 生产压差 低渗透 非达西渗流
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低渗透油藏地质工程一体化高效建产--以东营凹陷N25区块为例
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作者 任泽樱 《钻采工艺》 CAS 北大核心 2024年第3期90-96,共7页
东营凹陷低渗透油藏分布散、埋藏深、品位低,开发过程中注不进、采不出矛盾突出,效益建产面临单井产能低、自然递减大、采收率低等问题,高效开发难度大。以东营凹陷牛庄洼陷沙三段中亚段N25-42A低渗透浊积砂岩油藏为例,通过实施以储层... 东营凹陷低渗透油藏分布散、埋藏深、品位低,开发过程中注不进、采不出矛盾突出,效益建产面临单井产能低、自然递减大、采收率低等问题,高效开发难度大。以东营凹陷牛庄洼陷沙三段中亚段N25-42A低渗透浊积砂岩油藏为例,通过实施以储层精细刻画、复杂缝网压裂改造储层、正向压驱注水补能、钻井与地面工程优化设计施工为核心的地质工程一体化建产方案,有效提高地质甜点刻画精度,大幅缩短钻井周期,形成复杂缝网提高波及体积,快速补充地层能量,改善驱油效果。N25区块实施地质工程一体化建产方案后,平均单井产油量增加0.6倍,单井控制可采储量增加6倍,实现少井高产,投资大幅缩减。实践证明,地质工程一体化开发技术对于提升断陷盆地低渗透油藏的动用率、推动低品质油藏的产能建设具有一定应用价值和参考意义。 展开更多
关键词 低渗透油藏 地质工程一体化 储层甜点 压驱注水 效益开发 产能建设
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应力敏感特低渗气藏绝对无阻流量计算新方法
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作者 王美楠 蔡晖 +2 位作者 何新容 牟春荣 吴宗勇 《油气井测试》 2024年第1期67-71,共5页
为准确评价特低渗气藏产能,推导考虑应力敏感效应的气井产能方程,建立了特低渗气藏绝对无阻流量计算新方法。通过产能方程左端项数值与产气量的线性关系,确定方程系数A和B,建立考虑应力敏感效应的气井产能方程和绝对无阻流量计算公式,... 为准确评价特低渗气藏产能,推导考虑应力敏感效应的气井产能方程,建立了特低渗气藏绝对无阻流量计算新方法。通过产能方程左端项数值与产气量的线性关系,确定方程系数A和B,建立考虑应力敏感效应的气井产能方程和绝对无阻流量计算公式,提高特低渗气藏产能预测精度。经S气藏A1、B1、B2井现场应用,相比于忽略应力敏感影响,应力敏感的气井绝对无阻流量下降19%,设计产能精度达到90.4%和95.0%,表明应力敏感效应对气井产能影响较大。新方法更适用于特低渗气藏的产能评价,具有较大的推广应用价值。 展开更多
关键词 特低渗气藏 异常高压 应力敏感效应 渗流理论 气井产能方程 二项式 绝对无阻流量 产能评价
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海上低渗高含水气藏基于可动水的产能评价方法
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作者 王琴 王攀荣 +2 位作者 张骞 唐慧敏 杨柳 《长江大学学报(自然科学版)》 2024年第4期95-103,共9页
南海西部乐东区低渗气藏原生含水饱和度高,探井测试水气比高、层间差异大、孔隙水的赋存状态和可动条件不清,产水气井产能认识不准确。通过气水驱替与核磁共振实验,明确了靶区不同物性岩心可动水赋存特征和变化规律,建立可动水饱和度预... 南海西部乐东区低渗气藏原生含水饱和度高,探井测试水气比高、层间差异大、孔隙水的赋存状态和可动条件不清,产水气井产能认识不准确。通过气水驱替与核磁共振实验,明确了靶区不同物性岩心可动水赋存特征和变化规律,建立可动水饱和度预测模型,提出了基于可动水产出的产能评价方法。研究表明,低渗气藏储层孔喉半径小,可动水主要赋存在较大的微米级及亚微米级孔喉内;可动水饱和度与驱替压力梯度呈指数正相关关系,Ⅰ类岩心可动水饱和度的的主控因素是渗透率,Ⅱ类岩心主控因素是渗透率和驱替压差;可动水孔隙度与岩心孔隙度呈线性正相关关系,与岩心渗透率呈对数式正相关关系,极限驱替压差下Ⅰ类岩心可动水孔隙度在8%左右,Ⅱ类岩心则明显偏低,为4.2%~6.2%,且受渗透率影响较大。基于可动水产出的产能评价方法在乐东区探井应用效果好,可合理指导乐东区开发井产能研究。 展开更多
关键词 低渗气藏 高含水饱和度 可动水 驱替压差 气水两相稳态产能
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