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水平井生产数据分析模型 总被引:7,自引:3,他引:7
生产数据分析是近年来油藏工程的研究热点之一,它以不稳定渗流理论为基础,集常规油藏工程分析和现代试井分析之优势形成新的数学模型,既能合理预测油气井产量递减又能有效评价油气层物性。通过求解封闭地层水平井的三维不定常渗流问题,可得普通水平井的Agarwal-Gardner型产量递减曲线以及产量递减导数曲线理论图版。分析表明,Agarwal-Gardner型产量递减曲线可以分成2个阶段,前一段是不稳态递减段,其导数曲线不归一,而后一段为拟稳态递减段,其导数曲线归一,接近于Arps调和递减趋势;对于均质储集层,水平井的垂向位置对中长期产量递减规律影响很弱,可以忽略。矿场实例说明在已知生产数据的条件下利用该结果可直接评价储集层特性,并对水平井中长期产能进行有效预测。图4参14 相似文献
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改进的异常高压有水气藏物质平衡方程 总被引:1,自引:0,他引:1
异常高压气藏高温高压条件下,气-液界面相理论验证了在气藏气相中始终饱含有大量水蒸气。若在计算异常高压有水气藏地质储量过程中忽略水侵和气相水蒸气的存在,将产生较大误差。在广义异常高压气藏物质平衡原理的基础上,考虑气藏外部水体水侵及气藏气相中水蒸气含量,推导了异常高压有水气藏物质平衡方程,并给出了计算气藏地质储量的方法。实例证明,利用仅考虑气藏外部水侵方法或仅考虑气相水蒸气含量方法和容积法计算的异常高压有水气藏地质储量均偏大,其误差分别为2.38%、2.93%、3.62%。考虑气藏外部水侵及气相中水蒸气含量的异常高压有水气藏物质平衡方程能够较准确地计算气藏地质储量。 相似文献
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提出了一种评价异常高压气藏有限封闭水体能量的新方法。此方法是在广义物质平衡方程的基础之上,结合异常高压气藏的生产动态,计算出异常高压气藏有限封闭水体的水体倍数,从而对气藏的水体能量进行评价。通过对新场气田新3井的实例计算,得出有限封闭水体的水体倍数为0.0805。文章论证了此方法的可靠性和有效性。 相似文献
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Abstract Analyzing well production data is one of the important methods for estimating reservoir parameters such as hydrocarbon in place. Recent techniques rely on the use of material balance time to account for variable operating conditions. Many dual porosity reservoirs can be modeled by a composite reservoir. So production data analysis of composite dual porosity single permeability reservoirs is of great interest. Apparently, modern methods have not been applied to complex reservoir models such as composite dual porosity single permeability reservoirs. So the purpose of this article is to analyze production data of such reservoirs with the use of material balance time function. In the first step, a material balance time function is defined in the same way as the single porosity reservoirs and its applicability is confirmed by converting a constant well pressure solution to a constant well rate solution with the use of this time function. It should be noted that the available type curve matching methods cannot be applied to such reservoirs and in this article data analysis is based on the type curveless method. Furthermore, based on the time when each flow regime is observed, a discussion on the analysis of production data with the use of material balance time function for each case is conducted. Finally, applicability and accuracy of the material balance time method for estimation of oil in place of such reservoirs are demonstrated using synthetic reservoir examples. 相似文献
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The water coning phenomenon leads to decrease the wellhead pressure with moving of water into oil production zone, which is regarded as one of most serious problems during oil production. Therefore, the development of reliable models is important to predict the water coning breakthrough time, and consequently avoid the water coning phenomenon and production of water. To this end, the artificial neural network modeling strategy optimized with particle swarm optimization, least square support vector machine (LSSVM) approach coupled with the coupled simulated annealing optimization method, and finally decision tree method are implemented in current study to accurately predict the dimensionless breakthrough time of water coning. The results obtained in the present study demonstrate that the models proposed provide acceptable results in predicting the dimensionless breakthrough time of water coning. Furthermore, comparative study conducted illustrates the superiority of LSSVM methodology in terms of accuracy compared to the other methods investigated. 相似文献
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低渗气藏气井合理产量的确定是实现气藏稳产和提高采出程度的关键,但低渗气藏气井自然产能低,稳产期短,试井资料匮乏,给低渗气井合理配产带来较大困难.针对该情况,基于气井生产系统,将物质平衡方程与产能方程结合,通过生产数据建立多目标优化函数,并通过生产历史拟合确定出低渗气井的产能方程、单井控制储量和地层压力.在此基础上,考虑低渗气井的启动压力梯度、稳产时间、临界携液流量和外输压力等因素,建立了综合多种因素的低渗气藏合理配产模式.现场实际应用表明,该配产方法合理、可靠,对低渗气藏实际生产具有现实指导意义. 相似文献
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小层剩余油定量化分析方法 总被引:6,自引:5,他引:6
针对一些油田小层地质储量不清,小层累计采油量不清,因而小层剩余潜力不清、盲目性挖潜,进入高含水开发阶段、稳产难度更大的实际情况,为了经济有效开发油田,开展小层剩余油定量化分析方法研究。通过动静态结合系列技术处理,把全区原始地质储量合理地匹配到每口新老油井的小层上,又客观地预测单井小层累计采油量等等,获得目前单井小层剩余地质储量、剩余可动油量、采出程度等开发指标,确定小层可挖潜的空间,同时对“非储量层”采出量进行预测,了解油层的真正采出程度。经过以往压裂效果分析,该方法可信度达73.5%。 相似文献
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采油井口阀体材料ZG35CrMo(M)性能研究 总被引:2,自引:0,他引:2
采用三相碱性电弧炉熔炼加喷吹Si-Ca粉精炼技术,获得了油田采油井口用铸钢件阀体材料ZG35CrMo(M)。ZG35CrMo(M)与ZG35CrMo相比,两者所含含金元素一致,成分范围基本相同,但ZG35CrMo(M)内有害元素S、P及气体H、O、N含量比ZG35CrMo有较大幅度下降,分别为S、P≤0.015%,H、O≤50ppm、N≤70ppm。试验研究结果表明,ZG35CrMo(M)的力学性能比ZG35CrMo有较大的提高,抗H_2S应力腐蚀性能及焊接性能良好。用ZG35CrMo(M)铸造的32只阀体经海洋平台实际使用,各项性能良好,能很好地满足实际需要。 相似文献
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A significant fraction of the conventional oil reserves globally is in carbonate formations which contain a substantial amount of residual oil. Since primary and secondary recovery methods fail to yield above 20%–40%of original oil in place from these reserves, the need for enhanced oil recovery(EOR) techniques for incremental oil recovery has become imperative. With the challenges presented by the highly heterogeneous carbonate rocks,evaluation of tertiary-stage recovery techniques including chemical EOR(c EOR) has been a high priority for researchers and oil producers. In this review, the latest developments in the surfactant-based c EOR techniques applied in carbonate formations are discussed, contemplating the future direction of existing methodologies. In connection with this, the characteristics of heterogeneous carbonate reservoirs are outlined. Detailed discussion on surfactant-led oil recovery mechanisms and related processes, such as wettability alteration, interfacial tension reduction, microemulsion phase behavior, surfactant adsorption and mitigation, and foams and their applications is presented. Laboratory experiments, as well as field study data obtained using several surfactants, are also included.This extensive discussion on the subject aims to help researchers and professionals in the field to understand the current situation and plan future enterprises accordingly. 相似文献
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根据常规油气藏压裂直井Blasingame产量递减样板曲线建立方法,使用渐近法建立了拟稳态流动阶段无因次压力与无因次时间的线性关系获取方法,重新定义无因次参数,形成了考虑气体吸附和溶解的页岩气藏压裂水平井Blasingame典型样板曲线。结合页岩气藏物质平衡理论,将实例数据与样板曲线进行拟合,验证了Blasingame产量递减分析方法在页岩气藏压裂水平井生产数据解释中的有效性。研究结果表明:①基于新无因次变量,吸附、溶解影响下页岩气藏压裂水平井Blasingame样板曲线边界控制流阶段再次归结为一条斜率为-1的直线,结合吸附等实验数据,可有效降低拟稳态阶段的多解性;②页岩气藏压裂水平井Blasingame样板曲线受储量相关参数和裂缝参数的双重影响,储量相关参数越大,样板曲线位置越低,裂缝参数越大,样板曲线位置越高。③长期动态资料分析可有效获取储层物性参数、改造情况以及单井控制动态储量参数,基于拟合结果,为未来生产动态预测奠定了基础。 相似文献
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胜利油田断块油藏产量递减影响因素 总被引:10,自引:6,他引:4
张以根 《油气地质与采收率》2007,14(3):90-93
针对“十五”以来胜利油田断块油藏的产量递减率比其他类型油藏大及在高含水开发后期如何有效控制递减的问题,采用油藏工程方法和矿场统计归纳的方法,分析了影响产量递减的理论因素和矿场实际因素,提出了影响断块油藏产油量递减的主要因素是开采速度、开发阶段和产量结构等,并给出了减缓产量递减的措施建议。 相似文献
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根据常规油气藏压裂直井Blasingame产量递减样板曲线建立方法,使用渐近法建立了拟稳态流动阶段无因次压力与无因次时间的线性关系获取方法,重新定义无因次参数,形成了考虑气体吸附和溶解的页岩气藏压裂水平井Blasingame典型样板曲线。结合页岩气藏物质平衡理论,将实例数据与样板曲线进行拟合,验证了Blasingame产量递减分析方法在页岩气藏压裂水平井生产数据解释中的有效性。研究结果表明:①基于新无因次变量,吸附、溶解影响下页岩气藏压裂水平井Blasingame样板曲线边界控制流阶段再次归结为一条斜率为-1的直线,结合吸附等实验数据,可有效降低拟稳态阶段的多解性;②页岩气藏压裂水平井Blasingame样板曲线受储量相关参数和裂缝参数的双重影响,储量相关参数越大,样板曲线位置越低,裂缝参数越大,样板曲线位置越高。③长期动态资料分析可有效获取储层物性参数、改造情况以及单井控制动态储量参数,基于拟合结果,为未来生产动态预测奠定了基础。 相似文献
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潜山裂缝油藏降压开采增油机理及现场试验 总被引:7,自引:0,他引:7
系统地总结了任丘裂缝型碳酸盐岩潜山油藏在“九五”期间开展的降压开采现场试验成果.降压开采增油机理是通过驱动方式的改变,使油水关系重新分布,并利用裂缝的差异性闭合效应,使弹性力、重力和毛细管力的有利驱油作用得到了更好的发挥,减小了大裂缝的渗流能力及其对中小缝洞与岩块系统的干扰,从而发挥了中小缝洞及岩块系统的生产潜力.在此基础上提出了裂缝性油藏实施降压开采的时机与速度,对改善潜山油藏中、后期开发效果和提高采收率试验研究具有重要意义. 相似文献
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