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Magnetic Resonance Letters 2024年第1期4卷 28-39页

作者： Lu Zhang Lizhi Xiao Wensheng Wu guangzhi liao Yan Zhang Sihui Luo Xinglong Lei National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing102249China College of Geophysics China University of PetroleumBeijing102249China PetroChina Huabei Oilfield Company China National Petroleum CorporationRenqiu062552China

The measurement of nuclear magnetic resonance(NMR)porosity is affected by *** considering the impact of NMR logging tools,this phenomenon is mainly caused by variations in magnetization intensity of the measured system due to temperature fluctuations and difference between the temperature of the porous medium and calibration *** this study,the effect of temperature was explained based on the thermodynamic theory,and the rules of NMR porosity responses to temperature changes were identified through core physics *** addition,a method for correcting the influence of temperature on NMR porosity measurement was proposed,and the possible factors that may affect its application were also discussed.

关键词： NMR porosity Temperature Porous media Intensity of magnetization

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随钻核磁共振仪器缩短回波间隔方法优化设计

地球物理学报 2024年第1期67卷 409-418页

作者：刘伟张文秀陈文轩廖广志中国科学院深地资源装备技术工程实验室中国科学院地质与地球物理研究所北京100029 中国科学院地球科学研究院北京100029 中国石油大学(北京)地球物理学院北京102249

核磁共振测井是一种直接探测储层孔隙流体性质的地球物理方法,随钻核磁共振技术是在钻井过程中实时获得油气藏评价参数的技术方法.面对复杂油气藏中随钻核磁共振测量问题,通过缩短脉冲序列的回波间隔,可以减少仪器测量时间,能够获得快... 详细信息

核磁共振测井是一种直接探测储层孔隙流体性质的地球物理方法,随钻核磁共振技术是在钻井过程中实时获得油气藏评价参数的技术方法.面对复杂油气藏中随钻核磁共振测量问题,通过缩短脉冲序列的回波间隔,可以减少仪器测量时间,能够获得快速衰减的短弛豫组分,实现储层孔隙结构的精细表征.本文提出了一种多级能量泄放方法,能够逐级降低天线品质因数,缩短天线恢复的死区时间,在不改变回波采集信噪比的情况下,实现脉冲序列的短回波间隔采集系统设计,并在随钻核磁共振测井仪器实验样机上进行了测试验证.测试结果表明,仪器回波信号信噪比良好,振铃噪声与回波信号区分明显,测试结果与模拟仿真结果一致,能够实现短回波间隔数据采集,验证了方法的有效性和实用性.

关键词：核磁共振仪器随钻核磁共振回波间隔驰豫组分

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基于随机森林算法的二氧化碳驱油与封存主控因素研究

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地质科技通报 2024年第3期43卷 147-156页

作者：任俊帆薛亮聂捷肖镭廖广志中国石油大学(北京)油气资源与工程全国重点实验室北京102249 中国石油大学(北京)石油工程学院北京102249 中国石油大学(北京)地球物理学院北京102249 中国石油集团川庆钻探工程有限公司成都610051 阿里云计算有限公司杭州310030

在碳达峰、碳中和目标背景下,二氧化碳驱油与封存是经济可行的碳减排的主要技术手段。明确影响二氧化碳驱油与封存效果的主控因素,是实现二氧化碳高效驱油与封存的基础。在行业标准算例PUNQ-S3模型的基础上,综合考虑二氧化碳与原油混相... 详细信息

在碳达峰、碳中和目标背景下,二氧化碳驱油与封存是经济可行的碳减排的主要技术手段。明确影响二氧化碳驱油与封存效果的主控因素,是实现二氧化碳高效驱油与封存的基础。在行业标准算例PUNQ-S3模型的基础上,综合考虑二氧化碳与原油混相作用和二氧化碳构造、残余、溶解、矿化封存机理,构建了二氧化碳提高原油采收率与地质封存一体化数值模拟模型,结合随机森林智能算法,开展了影响二氧化碳驱产油量和封存量的储层和生产参数特征重要性分析,考虑驱油与封存时间尺度的差异,建立了参数时序特征重要性分析方法,实现了在不同二氧化碳驱油与封存阶段的主控因素分析。结果表明,二氧化碳驱油与封存时序随机森林模型准确性高,在二氧化碳驱油与封存前期,二氧化碳构造封存量受储层含水饱和度控制,溶解封存量受地层水矿化度控制;在二氧化碳驱油与封存中、后期,二氧化碳构造封存量则受储层渗透率控制,溶解封存量则受储层渗透率与地层水矿化度控制;残余封存量在二氧化碳驱油与封存前期较小,导致其主控因素不明显,在二氧化碳驱油与封存中后期受储层渗透率与含水饱和度控制;二氧化碳矿化封存量在整个二氧化碳驱油与封存阶段受地层水pH值与矿化度控制;二氧化碳驱油量在整个二氧化碳驱油与封存阶段受储层渗透率及含水饱和度控制。时序随机森林算法可以明确不同二氧化碳驱油与封存阶段的主控因素,为二氧化碳提高原油采收率和地质封存的高效实施提供了技术支撑。

关键词：二氧化碳驱油与封存随机森林算法特征重要性分析原油采收率数值模拟地层水矿化度储层

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页岩油地层原油黏度的核磁共振评价方法

地球物理学报 2024年第5期67卷 2057-2067页

作者：秦志军朱明月廖广志毛锐罗兴平张浩王刚肖立志樊睿琦油气资源与工程全国重点实验室中国石油大学(北京)北京102249 中国石油新疆油田分公司(勘探开发研究院) 克拉玛依834000 中国石油大学(华东)地球科学与技术学院青岛266580

随着页岩油气资源的规模化勘探与开发,精细地层评价发挥着越来越重要的作用.地层原油黏度作为影响页岩油开发方案、产能、产量以及采收率等的重要参数,是流体识别及定量评价的核心内容之一.然而,页岩油流体赋存状态多样且流动机理复杂,... 详细信息

随着页岩油气资源的规模化勘探与开发,精细地层评价发挥着越来越重要的作用.地层原油黏度作为影响页岩油开发方案、产能、产量以及采收率等的重要参数,是流体识别及定量评价的核心内容之一.然而,页岩油流体赋存状态多样且流动机理复杂,导致原油黏度指数难以准确估算.因此,建立页岩油地层原油黏度评价方法具有十分重要的意义.本文从核磁共振评价原油黏度的基础理论出发,分析并明确原油黏度、T_(2)对数平均值、绝对温度三者之间的关系,利用核磁共振方法表征不同温度下原油T_(2)弛豫特征与绝对温度的变化规律;然后,开展页岩油原油变温核磁共振实验,结合原油的黏温关系图版,分析表征原油黏度的主要参数,验证页岩油原油黏度理论计算模型的可行性;最后,通过饱含原油的页岩油岩心变温核磁共振实验,进一步明确地层条件下原油黏度、绝对温度以及T_(2)对数平均值之间的关系,改进原油黏度理论计算模型,建立了页岩油地层原油黏度的核磁共振评价方法.实际测井资料应用表明页岩油地层可动油黏度指数与实际试油得到的原油黏度相比,相对误差在5%以内,验证了该方法的应用效果.

关键词：原油黏度页岩油流体赋存状态 T_(2)谱变温核磁共振

软土地基加固用新型土壤固化剂的制备及性能研究

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当代化工 2024年第4期53卷 869-872,909页

作者：廖光志邹志雄福建岩土工程勘察研究院有限公司福建福州350108

为了提高软土资源的利用效率,以丙烯酸酯BA、丙烯酸AA和苯乙烯St作为单体,以脂肪醇聚氧乙烯AEO-9和山梨醇酐单油酸酯SP80作为乳化剂,通过乳液聚合法制备了一种适合软土地基加固用的新型土壤固化剂PPG-1,并对其综合性能进行了评价。结果... 详细信息

为了提高软土资源的利用效率,以丙烯酸酯BA、丙烯酸AA和苯乙烯St作为单体,以脂肪醇聚氧乙烯AEO-9和山梨醇酐单油酸酯SP80作为乳化剂,通过乳液聚合法制备了一种适合软土地基加固用的新型土壤固化剂PPG-1,并对其综合性能进行了评价。结果表明:土壤固化剂PPG-1的掺量越大,无侧限抗压强度、水稳定系数、抗冻指数和质量损失率就越大。养护龄期越长,无侧限抗压强度和水稳定系数就越大,固化处理效果就越好。推荐土壤固化剂PPG-1的最佳掺量为0.5%,能使目标固化土试样在养护7 d时的无侧限抗压强度值达到2.81 MPa,水稳定系数达到85.7%,并且经过冻融循环5次后的抗冻指数达到83.6%,质量损失率为小于5%,各项性能参数均能满足标准《土壤固化剂应用技术标准》(CJJ/T 286-2018)中对固化土性能指标的要求。新型土壤固化剂PPG-1能够显著改善软土样品的力学性能、耐水性能和抗冻性能,能够满足软土地基加固的需求。

关键词：软土地基固化土土壤固化剂无侧限抗压强度水稳定性能

高压注空气驱油过程中油气爆炸风险分析及特性实验

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石油学报 2024年第7期45卷 1141-1151页

作者：黄丽娟陈志伟李宗法周小淞张贺源廖广志任韶然长江大学油气钻采工程湖北省重点实验室湖北武汉430100 长江大学石油工程学院湖北武汉430100 中国石油吐哈油田公司采油工艺研究院新疆鄯善838200 中国石油勘探开发研究院北京100083 中国石油大学(华东)石油工程学院山东青岛266580

注空气驱油是一项经济有效的提高采收率技术,同时油气—空气混合物的防爆安全备受关注。目前爆炸风险评估多是基于低温低压条件下油气爆炸特性进行的,缺乏针对实际油田高温高压工况下的研究。采用自行研制的高温高压油气爆炸实验装置,... 详细信息

注空气驱油是一项经济有效的提高采收率技术,同时油气—空气混合物的防爆安全备受关注。目前爆炸风险评估多是基于低温低压条件下油气爆炸特性进行的,缺乏针对实际油田高温高压工况下的研究。采用自行研制的高温高压油气爆炸实验装置,模拟井筒注空气工况,研究了压力、密度、气体组分对天然气爆炸极限的影响。实验结果表明,100℃时压力从5 MPa升高至15 MPa,爆炸极限范围扩大了10.25%,爆炸风险增加。通过进行稀油和稠油的自燃爆实验表明,高温导致轻质组分蒸发,稀油和稠油的自燃爆温度随密度增加均升高,在15 MPa条件下,自燃爆温度可低至190~207℃。针对不同注空气工艺流程和油气爆炸机理进行了爆炸风险分析,当注气井压力低于油藏压力时,油气回流进入井筒与空气混合是发生爆炸的主要原因;生产井中,由于原油氧化不完全或气窜导致氧浓度超过临界氧含量是导致爆炸的最重要因素之一。最后,基于实验和理论分析结果,提出了不同注空气工艺过程中有效的井筒防爆措施。

关键词：注空气油气爆炸自燃爆高温高压密度

Numerical simulation study on the effect of temperature on the restricted diffusion in porous media

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Magnetic Resonance Letters 2023年第2期3卷 118-126,I0003页

作者： Zhen Xie Lizhi Xiao Sihui Luo guangzhi liao College of Artificial Intelligence China University of PetroleumBejing102249China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing02249China College of Carbon Neutral Energy China University of PetroleumBeijing102249China

It is of great significance to study how temperature affects the restricted diffusion in pores for an accurate evaluation of reservoir physical properties by using nuclear magnetic resonance(NMR)diffusion-transverse relaxation(D-T2)spectrum under reservoir temperature *** this paper,we simulate the restricted diffusion and twodimensional(2D)NMR D-T2 spectra of water molecules at different temperatures using random-walk *** one-dimensional(1D)restricted diffusion simulation results show that the diffusion coefficient in the pore at room temperature decays with the diffusion time and eventually reaches a *** the condition of long-time diffusion,the ratio of restricted diffusion coefficient to bulk diffusion coefficient at different temperatures tends to be the same *** the increase in temperature,the simulated D-T2 spectra also gradually move *** simulated D-T2 spectra at all temperatures are consistent with the Pade interpolation *** addition,the results calculated by Pade interpolation equation demonstrate that the degree of temperature influence on the D-T2 spectrum of rock is quantitatively related to the pore radius,porosity and cementation index.

关键词： D-T_(2)spectra Temperature Restricted diffusion Numerical simulation

Production calculation of the second and tertiary recovery combination reservoirs under chemical flooding

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Petroleum Exploration and Development 2021年第6期48卷 1403-1410页

作者： LIU Weidong WANG Gaofeng liao guangzhi WANG Hongzhuang WANG Zhengmao WANG Qiang WANG Zhengbo State Key Laboratory of Enhanced Oil Recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China PetroChina Exploration&Production Company Beijing 100007China

Based on the analysis of the production composition of reservoirs developed by the second&tertiary recovery combination(STRC),the relationship between the overall output of the STRC project and the production level during the blank water flooding stage is *** to the basic principle of reservoir engineering that the“recovery factor is equal to sweeping coefficient multiplied by oil displacement efficiency”,the formula for calculating the ultimate oil recovery factor of chemical combination flooding reservoir was *** dividing the reservoir into a series of grids according to differen-tial calculus thinking,the relationship between the ultimate recovery factor of a certain number of grids and the recovery de-gree of the reservoir was established,and then the variation law of oil production rate of the STRC reservoir was *** concept of“oil rate enlargement factor of chemical combination flooding”was defined,and a production calculation method of reservoir developed by STRC was put forward based on practical oilfield development *** study shows that the oil production enhancing effect of STRC increases evenly with the in crease of the ratio of STRC displacement efficiency to water displacement efficiency,and increases rapidly with the increase of the ratio of recovery degree at flooding mode conversion to the water displacement *** is more effective in increasing oil production of reservoir with high recovery *** practical tests of the alkali free binary flooding(polymer/surfactant)projects,the relative error of the oil production calculation method of STRC reservoir is about±10%,which meets the requirements of reservoir engineering.

关键词： chemical combination flooding second&tertiary recovery combination oil displacement efficiency oil rate en-largement factor of chemical flooding oil production calculation

Carbon emission reduction accounting method for a CCUS-EOR project

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石油勘探与开发:英文版 2023年第4期50卷 989-1000页

作者： WANG Fang liao guangzhi SU Chunmei WANG Feng MA Jianguo YANG Yongzhi State Key Laboratory of Enhanced Oil and Gas Recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China PetroChina Oil&Gas and New Energy Company Beijing 100007China Carbon Dioxide Development Company PetroChina Jilin Oilfield CompanySongyuan 138000China

It is difficult to quantify and certify the greenhouse gas(GHG)emission reduction in the entire process of a project of carbon capture,utilization and storage(CCUS)-enhanced oil recovery(EOR).Under the methodological framework for GHG voluntary emission reduction project,the carbon emission reduction accounting method for CCUS-EOR project was established after examining the accounting boundaries in process links,the baseline emission and project emission accounting methods,and the emission and leakage quantification and prediction models,in order to provide a certification basis for the quantification of GHG emission reduction in the CCUS-EOR *** on the data of energy consumption,emission and leakage monitoring of the CCUS-EOR industrial demonstration project in Jilin Oilfield,the net emission reduction efficiency is determined to be about 91.1%at the current storage efficiency of 80%.The accounting and prediction of carbon emission reduction for CCUS-EOR projects with different concentrations and scales indicate that within the project accounting boundary,the certified net emission reduction efficiency of the low-concentration gas source CCUS-EOR projects represented by coal-fired power plants is about 37.1%,and the certified net emission reduction efficiency of the high-concentration gas source CCUS-EOR projects represented by natural gas hydrogen production is about 88.9%.The proposed method is applicable to the carbon emission reduction accounting for CCUS-EOR projects under multiple baseline scenarios during the certification period,which can provide decision-making basis for the planning and deployment of CCUS-EOR projects.

关键词： CCUS-EOR carbon emission accounting accounting boundary baseline emission

CO2 flooding strategy to enhance heavy oil recovery

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Petroleum 2017年第1期3卷 68-78页

作者： Tuo Huang Xiang Zhou Huaijun Yang guangzhi liao Fanhua Zeng Petroleum Systems Engineering Faculty of Engineering and Applied ScienceUniversity of ReginaReginaSaskatchewanS4S 0A2Canada Production Technology Institute of Dagang Oilfiled Petro ChinaTianjin300280PR China Exploration and Production Company Petro ChinaBeijing100007PR China

CO_(2) flooding is one of the most promising techniques to enhance both light and heavy oil *** light oil recovery,the production pressure in CO_(2) flooding in general keeps constant in order to maintain the miscibility of injected CO_(2) and crude oil;while in heavy oil recovery,a depleting pressure scheme may be able to induce foamy oil flow,thus the oil recovery could be further *** this study,different pressure control schemes were tested by 1-D core-flooding experiments to obtain an optimized *** simulations were conducted to history match all experimental data to understand the mechanisms and characteristics of different CO_(2) flooding *** the core-flooding experiments,1500 mD sandstone cores,formation brine and a heavy oil sample with a viscosity of about 869.3 cp at reservoir condition(55℃ and 11 MPa)were *** each CO_(2) flooding test,early stage water-flooding was conducted until the water cut reached 90%.Different CO_(2) injection rates and production pressure control strategies were tested through core-flooding *** results indicated that a slower CO_(2) injection rate(2 ml/min)led to a higher recovery factor from 31.1%to 36.7%,compared with a high CO_(2) injection rate of 7 ml/min;for the effects of different production strategies,a constant production pressure at the production port yielded a recovery factor of 31.1%;while a pressure depletion with 47.2 kPa/min at the production port yielded 7%more oil recovery;and the best pressure control scheme in which the production pressure keeping constant during CO_(2) injection period,then depleting the model pressure with the injector shut-in yielded a recovery factor of 42.5%of the initial *** the numerical simulations study,the same oil relative permeability curve was applied to match the experimental results to all *** gas relative permeability curves were obtained when the production pressure schemes are different.A much lo

关键词： CO_(2)flooding Foamy oil Enhanced oil recovery Relative permeability curve Numerical simulation