强天然水驱油藏开发后期产液结构自动优化技术

基于最优控制理论,以强天然水驱油藏的生产规律作为基础约束条件,建立强天然水驱油藏开发后期产液结构数学模型,利用改进的同时扰动随机逼近算法(SPSA)对模型进行求解,并编制产液结构自动优化软件。模型避免了传统优化方法只注重求取数学最大值而忽略油田生产规律的缺点,具有计算效率高、周期短、能够自动寻优的优点,可满足油田开发后期产液结构的自动优化,同时也为同类油藏的开发调整提供参考。软件应用在南美洲厄瓜多尔D油田的开发生产实践中,实现了油田开发后期产液结构自动优化。

能源转型背景下国家石油公司动态与启示

2021年,国家石油公司产量占全球油气总产量的近50%,然而,在能源转型的大背景下国家石油公司面临着碳达峰、碳中和的巨大压力。为适应不断变化的能源市场,文章关注分析能源转型背景下国家石油公司的最新动态,并结合中国国情和油气供应的实际情况提出了相关建议。分析认为,中国石油公司应将传统能源和新能源融合,并逐步向替代能源过渡,实现能源的稳定供应和可持续发展。一是紧随脱碳减排潮流,严格遵守碳减排要求;二是优化资产组合,分散关键风险;三是强化科技创新引领,建设碳捕集、利用与封存(CCUS)产业链体系;四是开拓创新,新能源领域多元化发展。

油藏高含水期注采液量优化

针对目前高含水期强边底水油藏注采液量优化是以人工设定方案,人为因素影响较大,具有随意性和盲目性,优选出的方案不一定是最佳方案等问题,基于井间连通性计算模型,建立注采液量优化数学模型,以经济净现值NPV作为目标函数,结合油田实际制定相应约束条件,运用收敛性很好的GSPSA算法进行优化计算,能够自动进行注采液量优化,极大节省生产优化时间。国外实际油田应用表明,示踪剂试验验证该模型可靠性较好,生产优化目标函数收敛,区块优化的注采液量达到了很好的控水增油效果。

The productivity evaluation model and its application for finite conductivity horizontal wells in fault block reservoirs

It is very difficult to evaluate the productivity of horizontal wells in fault block reservoirs due to the influence of fault sealing.On the basis of the method of images and source-sink theory,a semianalytical model coupling reservoir and finite conductivity horizontal wellbore flow dynamics was built,in which the influence of fault sealing was taken into account.The distribution of wellbore flow and radial inflow profiles along the horizontal interval were also obtained.The impact of the distance between the horizontal well and the fault on the well productivity was quantitatively analyzed.Based on this analysis,the optimal distance between the horizontal well and the fault in banded fault block reservoirs could be determined.According to the field application,the relative error calculated by the model proposed in this paper is within ±15%.It is an effective evaluation method for the productivity of horizontal wells in fault block reservoirs.The productivity of the horizontal well increases logarithmically as the distance between the horizontal well and the fault increases.The optimal distance between the horizontal well and the fault is 0.25-0.3 times the horizontal well length.

Auto-optimization of production-injection rate for reservoirs with strong natural aquifer at ultra-high water cut stage

Based on the optimal control theory and taking the production law of reservoirs with strong natural aquifer as the basic constraint, a mathematical model of liquid production for such reservoirs in the later stage of development is established. The model is solved by improved simultaneous perturbation stochastic approximation algorithm(SPSA), and an automatic optimization software for liquid production is developed. This model avoids the disadvantage of traditional optimization methods that only focus on the maximum value of mathematics but ignore the production law of oilfield. It has the advantages of high efficiency of calculation, short period and automatic optimization. It can satisfy the automatic optimization of liquid production in later stage of oilfield development. The software was applied in the oilfield development of D oilfield, Ecuador in South America, and realized the automatic optimization of liquid production in the later stage of oilfield development.

基于单井敏感性局域化EnKF的油藏辅助历史拟合方法

常用的油藏自动历史拟合算法多数存在梯度计算不准确、产生伪相关性等问题,导致参数修正错误、模型反演失真。通过建立一种基于单井动态敏感性的局域化集合卡尔曼滤波(FMM-CL-EnKF)历史拟合方法,解决了传统距离截断方法处理伪相关性时与实际地层状况不匹配的问题。基于程函方程,根据地质模型静态参数场信息,快速追踪压力波从井点到地层网格的传播时间确定各单井动态最大敏感性区域,从而构建局域化矩阵。同时,结合集合卡尔曼滤波(EnKF)方法,实现数据同化方法梯度的矫正,减弱伪相关,通过逐步拟合生产动态达到更新油藏模型和获取最优估计的目的。概念算例和矿场算例的计算结果表明,FMM-CLEnKF方法在模型集合生产动态拟合效果及反演模型参数场准确性等方面均优于标准EnKF方法。

Exendin-4对MCAO再灌注导致的脑缺血/再灌注损伤具有神经保护作用

目的探讨GLP-1受体激动剂Exendin-4腹腔给药对大脑中动脉闭塞(MCAO)再灌注所致大鼠脑缺血/再灌注损伤的神经保护作用。方法SD大鼠术前1 h腹腔注射Exendin-4,MCAO再灌注24 h后进行神经功能缺损评分,TTC染色计算脑梗死体积,免疫荧光观察神经元和小胶质细胞生存数量及检测凋亡通路相关蛋白的相对表达水平。结果Exendin-4能够保护由于MCAO再灌注后所致的脑缺血再灌注损伤,减少了脑梗死体积,降低皮层凋亡蛋白的相对表达水平,抑制神经元凋亡。结论Exendin-4可以对MCAO再灌注所致脑缺血/再灌注损伤具有神经保护作用,该作用是通过抑制凋亡蛋白的产生,从而抑制细胞凋亡。