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开发实践表明,稠油油藏内部发育的夹层影响蒸汽辅助重力泄油(SAGD)开发效果。实际SAGD开发应当充分考虑夹层对SAGD生产效果的影响,寻找突破夹层的有效对策,以期提高SAGD产量。以国内某超稠油油藏地质特征为基础,结合夹层岩石力学参数测试结果,利用耦合岩石力学数值模拟技术确定了不同参数(岩石力学参数、物性参数、操作参数)对岩石变形量、SAGD产量的敏感性。研究结果表明,夹层的渗透率和SAGD注汽压力是影响SAGD产量的主要因素。进一步地,针对夹层特征,结合实际操作可行性,提出了提高注汽压力和直井辅助两种突破夹层技术对策,并给出了相应的技术界限及突破效果,该研究结果可用于指导稠油油藏双水平井SAGD经济高效开发 相似文献
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为定量描述稠油油藏蒸汽辅助重力泄油(SAGD)开采过程中注采井间夹层对双水平井泄油通道与开发效果的影响,针对新疆油田A区块,利用CMG数值模拟软件建立了表征SAGD注采井间夹层的数值模拟模型,对注采井间存在不同大小、间距及物性夹层情况下的SAGD蒸汽腔发育形态与开发效果进行对比,得到了稠油油藏夹层非均质影响SAGD开发的临界特征参数。矿场实际的非均质SAGD井组夹层展布特征、蒸汽腔发育特征及生产效果对比结果表明,得到的结论与矿场实践一致,因此可用于指导并实现经济、高效的稠油油藏双水平井SAGD开发。 相似文献
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以胜利油田A区块特超稠油油藏为目标区块,自主研发了高温高压二维比例物理模型,研究了不同开发阶段水平井蒸汽驱油机理,开展了油藏压力、井底干 度、注汽强度对水平井蒸汽驱的效果影响的研究。物模实验结果显示,蒸汽驱整个过程分为三个阶段：存水回采期、汽驱受效期、蒸汽突破期。存水回采期蒸汽腔向水平方向扩展,以水平驱替方式为主 ;汽驱受效期蒸汽腔向垂向和水平方向扩展,以水平驱替方式为主,纵向泄油为辅;后期蒸汽突破,蒸汽腔继续向上方扩展,以纵向泄油为主,实现油层整体动用。5 MPa时转蒸汽驱的采出程度高于7 MPa时转蒸汽驱的采出程度;蒸汽驱的井底蒸汽干度应不低于0.4,蒸汽干度越高,水平井蒸汽驱的开发效果越好;注汽强度为1.9 t/(d·ha·m)时温度场最为发育。同时,在高压下提高干度可实现水 平井蒸汽驱的有效开发。以上的实验结果较好地指导了胜利油田A区块特超稠油油藏水平井蒸汽驱开发,取得了明显的开发效果,该研究对于类似稠油和超稠油油藏水平井蒸汽驱开发具有重要的指导意义 。 相似文献
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针对稠油水平井蒸汽吞吐面临入井渗流阻力大、产量水平低、吞吐递减率高、采收率偏低等问题,提出了电加热辅助水平井蒸汽吞吐方法。首先根据水平井蒸汽吞吐过程中的电加热与蒸汽复合传热特征,建立了电加热辅助蒸汽吞吐三个阶段的(注汽阶段、焖井阶段、生产阶段)储层升温解析模型,在此基础上,设计并开展了电加热辅助蒸汽吞吐和常规水平井吞吐的宏观比例物理模拟对比实验,通过实验验证了解析公式,揭示电加热改善水平井吞吐效果关键机理,并利用实际典型井模型进行了潜力预测。结果表明:电加热协同蒸汽吞吐,具有注蒸汽阶段实现水平段均匀加热升温、焖井阶段持续热补偿加热近井地带、生产阶段降低原油入井渗流阻力并提高吞吐产量的关键机理。典型井组预测电加热辅助水平井吞吐可提高吞吐采收率9.4%,油汽比从0.14提高到0.23,在水平井蒸汽吞吐油藏具有重要应用潜力。 相似文献
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泥质夹层对油砂SAGD的开发效果具有一定影响。以加拿大麦凯河某区块为研究对象,利用数值模拟手段,对位于注入井上方和注采井间的泥质薄夹层进行表征,模拟对比了泥质薄夹层的位置、延展长度、渗透率、厚度以及条数对SAGD开发效果的影响,得到了油砂SAGD开发的泥质薄夹层的临界参数。研究表明,泥质薄夹层位于注入井上方时对SAGD开发效果影响较小,位于注采井间时有不利影响,且越靠近生产井,蒸汽腔发育越晚,累产油量越低。注采井间泥质薄夹层超过7条、延展长度超过20 m时蒸汽腔几乎不发育,而渗透率与厚度对SAGD开发效果影响不明显。因此油砂SAGD布井时注采井间应尽量避开泥质薄夹层,从而有效降低泥质薄夹层对SAGD的影响。该研究结果,对于指导油砂SAGD部署、规避地质风险、实现SAGD高效开发具有重要指导意义。 相似文献
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油藏地球化学测试技术在大庆油田的应用 总被引：1，自引：0，他引：1
介绍了四项油藏地球化学新技术及在油田勘探开发研究中的实际应用效果.高温气相色谱技术把原油组分的分析范围从C1～C40提高到C1～C100;含氮化合物分离测试技术,实现了对原油中微量含氮化合物的分离和色质绝对量定量检测;储层油水层划分技术开发出了判别油水层技术;原油开采动态监测气相色谱技术在国内首次开发出了四层原油产能配比实验方法.这些技术经过在大庆油田两年多的实际应用,在稠油类型、油源对比、油气运移、油水层划分、油井产能监测等研究中都发挥了重要作用. 相似文献
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蒸汽辅助重力泄油（SAGD）快速预热技术利用短时间的注入高压蒸汽在生产井和注入井之间形成一个高孔隙度和高渗透率的扩容蒸汽腔，其几何形态与扩展规律可由微地震技术进行监测和描述。笔者选取风城重油油田的一组SAGD快速预热注入与生产井组进行井下微地震监测，采用三维弹性波逆时干涉震源定位算法获取弱微地震事件的空间分布，定量计算高温蒸汽注入期间形成蒸汽腔体的长度、宽度、高度、方位和扩容体积，对蒸汽腔体几何形态和震级能量分布的动态变化进行分析，探讨蒸汽腔前缘在深度上针对非均质性夹层的延伸趋势与形态。研究结果表明，注入井与生产井之间已经联通，且扩容区域已部分延伸至油层底界面。此外，注入井上方储层产生了较多的微地震事件，表明本次施工已击破注入井上方的非均质物性夹层，完成了注入井上方储层改造的任务。 相似文献
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介绍了四项油藏地球化学新技术及在油田勘探开发研究中的实际应用效果。高温气相色谱技术把原油组分的分析范围从C1～C40提高到C1～C100含氮化合物分离测试技术，实现了对原油中微量含氮化合物的分离和色质绝对量定量检测；储层油水层划分技术开发出了判别油水层技术；原油开采动态监测气相色谱技术在国内首次开发出了四层原油产能配比实验方法。这些技术经过在大庆油田两年多的实际应用，在稠油类型、油源对比、油气运移、油水层划分、油井产能监测等研究中都发挥了重要作用。 相似文献
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在稠油油藏开发中,由于原油黏度高一般采用注蒸汽开采。基于连续介质力学理论,考虑了热对流的影响,建立了蒸汽注入条件下对地层压力、变形和有效应力定量评价的改进的热-流体-力学耦合数学模型;应用全隐式顺序Galerkin有限元数值解方案对注蒸汽井热-流体-力学耦合过程进行了数值模拟。计算结果表明,由于地层流体高温膨胀引起的高压力,会导致位移、变形,甚至地层结构破裂;温度对地层破裂形态的影响显著。研究表明,这个改进模型比传统模型更加准确、实用,可以用于蒸汽注入速率优化和油藏、地质、热-流动力反应、地应力水平等综合作用效应研究。 相似文献
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天然气水合物被誉为最有研究价值和开采价值的清洁能源,已经成为当今世界能源研究的热点。但到目前为止还未形成成熟稳定的天然气水合物开采技术体系,仍处于研究和试采阶段。陆域冻土天然气水合物开采与海域天然气水合物开采相比相对比较容易,在钻进过程中能够形成较稳定的孔壁。天然气水合物开采的主要方法有热激法、降压法、置换法和化学抑制剂法。SAGD（Steam Assisted Gravity Drainage）技术也叫蒸汽辅助重力驱油技术,在重油、油砂开采中得到了迅速发展,取得了非常有效的成果,被认为是目前重油开采最有效的方法。对SAGD技术应用到陆域冻土天然气水合物开采中进行理论分析研究,经过分析发现将SAGD技术应用到天然气水合物开采中是可行的,但确定两口水平井之间的距离是关键,且在应用时要将上部井变为生产井,下部井变为注汽井。 相似文献
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The ensemble Kalman filter (EnKF) has been successfully applied to data assimilation in steam-assisted gravity drainage (SAGD) process, but applications of localization for the EnKF in the SAGD process have not been studied. Distance-based localization has been reported to be very efficient for assimilation of large amounts of independent data with a small ensemble in water flooding process, but it is not applicable to the SAGD process, since in the SAGD process, oil is produced mainly from the transition zone steam chamber to cold oil instead of the regions around the producer. As the oil production rate is mainly affected by the temperature distribution in the transition zone, temperature-based localization was proposed for automatic history matching of the SAGD process. The regions of the localization function were determined through sensitivity analysis by using a large ensemble with 1000 members. The sensitivity analysis indicated that the regions of cross-correlations between oil production and state variables are much wider than the correlations between production data and model variables. To choose localization regions that are large enough to include the true regions of non-zero cross-covariance, the localization function is defined based on the regions of non-zero covariances of production data to state variables. The non-zero covariances between production data and state variables are distributed in accordance with the steam chamber. This makes the definition of a universal localization function for different state variables easier. Based on the cross-correlation analysis, the temperature range in which oil production is contributed is determined, and beyond or below this range, the localization function reduces from one, and at the critical temperature or steam temperature, the localization function reduces to zero. The temperature-based localization function was obtained through modifying the distance-based localization function. Localization is applied to covariance of data with permeability, saturation, and temperature, as well as the covariance of data with data. A small ensemble (10 ensemble members) was employed in several case studies. Without localization, the variability in the ensemble collapsed very quickly and lost the ability to assimilate later data. The mean variance of model variables dropped dramatically by 95 %, and there was almost no variability in ensemble forecasts, while the prediction was far from the reference with data mismatch keeping up at a high level. At least 50 ensemble members are needed to keep the qualities of matches and forecasts, which significantly increases the computation time. The EnKF with temperature-based localization is able to avoid the collapse of ensemble variability with a small ensemble (10 members), which saves the computation time and gives better history match and prediction results. 相似文献
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Seyed Erfan Saberhosseini Reza Keshavarzi Kaveh Ahangari 《Arabian Journal of Geosciences》2017,10(6):152
One of the crucial consequences of steam assisted gravity drainage (SAGD) process is abnormal reservoir uplifting under thermal steam injection, which can significantly influence the reservoir rock deformation, specifically thin bed reservoirs and causes intensive failures and fractures into the cap rock formations. A thorough understanding of the influences of rock thermo-mechanical properties on reservoir uplifting plays an important role in preventing those aforementioned failures within design and optimization process in SAGD. In addition, coupling of reservoir porous medium and flowing of specific fluid with temperature as an additional degree of freedom with initial pore pressure and in-situ stress condition, are also very challenging parts of geomechanical coupled simulation which would be clearly explained. Thus, a fully coupled thermo-poro-elastic geomechanical model with finite element codes was performed in ABAQUS to investigate the role of rock thermo-mechanical parameters on reservoir vertical uplift during steam injection. It is clearly observed that, any increase in rock thermo-mechanical properties specifically rock’s thermal properties such as specific heat, thermal expansion, and formation’s thermal conductivity, have significant influences on reservoir uplift. So by coupling the temperature as an additional degree of freedom with the coupled pore-fluid stress and diffusion finite element model of SAGD process, the more realistic simulation will be conducted; hence, the errors related to not having heat as an additional degree of freedom will be diminished. In addition, Young’s modulus and specific heat are the rock thermo-mechanical parameters which have the maximum and minimum effects on the reservoir uplift, respectively. 相似文献