稠油油藏同心三层分层注汽技术研究

发布时间：2018-05-12 13:40

本文选题：稠油 + 注蒸汽　；参考：《西南石油大学》2015年硕士论文

【摘要】：随着当今世界对石油资源需求的快速增长以及原油勘探开发程度的不断深入,稠油油藏在世界油气资源中的地位日益凸显。注蒸汽热力采油是当今稠油开发的主要方式。由于稠油油藏非均质性以及注蒸汽开发初级阶段的合注合采,致使后期油藏动用程度不均,层间矛盾突出,降低蒸汽的纵向波及效率,影响原油的采收率。稠油油藏分层注汽技术能够有地效缓解油藏储层层间矛盾,均衡油藏纵向吸汽效率,是稠油开发到达后期时油藏提高采收率的一种行之有效的重要方法。本文首先对已有稠油油藏分层注汽技术按照注汽工艺类型进行分类,主要分为分层定量注汽、分层配汽、偏心式分层注汽以及同心管分层注汽。通过分析得出稠油油藏分层注汽技术存在的主要问题是注汽单元蒸汽配注量调整不便和一次管柱注汽层数的局限性。然后在同心管分层注汽技术基础上结合分层配汽技术原理提出了同心三层分层注汽技术,设计了同心三层注汽管柱与相关井下工具。该注汽管柱的设计实现了一次同心管柱同时分三层注汽,其中两层采用分层配汽原理控制蒸汽注入量,打破了同心管分层注汽技术只能分注两层的限制。在地面利用同心双管注汽井口装置即可直观边界地调整各层蒸汽配注量,无需起出管柱或投捞作业。通过对管柱主要工具的重新设计与相应强度计算保证了同心三层注汽技术的可靠性。对稠油油藏同心三层分层注汽过程中井筒中的压力分布和干度分布规律进行分析计算,利用井筒压力、干度的计算模型对某注汽井压力、干度进行了实例计算,分析检验了计算方法的正确性。该方法为稠油油藏同心三层分层注汽技术的设计提供了依据,也可以用于对注汽井工况参数的设计分析。对稠油油藏同心三层分层注汽技术进行了实例应用,措施后增油效果明显,该技术有效地提高了油藏的纵向动用程度,改善了注蒸汽开发效率,提供了一种稠油注蒸汽开采后期提高原油采收率的新方法。
[Abstract]:With the rapid growth of the world demand for oil resources and the deepening of crude oil exploration and development, the status of heavy oil reservoirs in the world oil and gas resources has become increasingly prominent. Steam injection thermal recovery is the main way to develop heavy oil. Due to the heterogeneity of heavy oil reservoir and the combination of injection and production in the primary stage of steam injection development, the degree of reservoir production is uneven in the later stage, the contradiction between layers is prominent, the vertical sweep efficiency of steam is reduced, and the recovery of crude oil is affected. Stratified steam injection technology in heavy oil reservoirs can alleviate the contradiction between layers of reservoirs and balance the vertical steam absorption efficiency of reservoirs. It is an effective and effective method to improve oil recovery in the late stage of heavy oil development. In this paper, stratified steam injection technology in existing heavy oil reservoirs is classified according to steam injection process type, which is mainly divided into stratified quantitative steam injection, stratified steam distribution, eccentric stratified steam injection and concentric pipe stratified steam injection. The main problems of stratified steam injection technology in heavy oil reservoir are the inconvenient adjustment of steam injection rate of steam injection unit and the limitation of steam injection layer number of primary tubing string. Then, based on the stratified steam injection technology of concentric pipe, combined with the principle of stratified steam distribution technology, this paper puts forward the concentric three-layer stratified steam injection technology, and designs the concentric three-layer steam injection pipe string and related downhole tools. The design of the steam injection string realizes that the single concentric pipe string can be divided into three layers at the same time, in which two layers adopt the principle of stratified steam distribution to control the steam injection rate, which breaks the restriction that the concentric pipe stratified steam injection technology can only be divided into two layers. By using concentric double-pipe steam injection wellhead device on the ground, the steam flux distribution of each layer can be adjusted intuitively and without the need of tubing string or fishing operation. The reliability of concentric three-layer steam injection technology is ensured by redesigning the main tools of pipe string and calculating the corresponding strength. The pressure distribution and dryness distribution in the wellbore during the process of concentric three-layer stratified steam injection in heavy oil reservoir are analyzed and calculated. The calculation model of wellbore pressure and dryness is used to calculate the pressure and dryness of a steam injection well. The correctness of the calculation method is verified by analysis. This method provides a basis for the design of concentric three-layer stratified steam injection technology in heavy oil reservoirs and can also be used to design and analyze the operating parameters of steam injection wells. In this paper, the application of concentric three layer stratified steam injection technology in heavy oil reservoir is carried out, and the effect of increasing oil is obvious after the measure. This technology can effectively improve the degree of vertical production of the reservoir and improve the efficiency of steam injection development. A new method for enhancing oil recovery in the later stage of heavy oil steam injection production is presented.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.7

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