提高蒸汽驱纵向动用程度注采工艺技术研究与应用

发布时间：2018-11-04 10:16

【摘要】：蒸汽驱技术是辽河油田稠油转换开发方式,提高采收率的重要接替技术,在多个区块实现了工业化应用与推广。但随着蒸汽驱技术应用时间的延长,应用区域的扩大,部分区块出现了油层纵向动用不均的情况,影响了汽驱开采效果。虽然,前期研发了蒸汽驱偏心注入工艺技术提高油层纵向动用程度,该技术利用投捞器对井下偏心配汽阀的投捞改变不同层位的配汽量,但在应用过程中,由于管柱长期注汽,存在一定程度的注汽管柱变形、偏心配汽筒结垢等情况,投捞成功率低,注汽井动态调控困难,影响注汽效果。同时,目前蒸汽驱生产井中,采用笼统方式进行采油,由于各油层固有压力不平衡,造成采油井纵向出现层间干扰现象,大大降低油井产能。本文在前期研究基础上,结合蒸汽驱开发现状与开发特点,研发了蒸汽驱同心两层注入工艺技术,优化了管柱结构；建立蒸汽驱同心双管注汽井筒压力、温度、干度、井筒热损失计算模型,对注汽参数进行了优化设计。现场应用表明,该工艺技术能够满足油藏配注量要求,在井口即可实现对上下两层注汽量的动态调控。至2014年,该技术在辽河油田蒸汽驱区块累计应用19井次,施工成功率100%,措施有效率100%,累计增油4.9×104吨,取得了良好的应用效果。与此同时,根据蒸汽驱生产井的特点,研发了蒸汽驱分层采油技术,进行了室内中间试验与现场试验,试验井检泵周期373天,较该井笼统生产检泵周期延长44天,累计增液2787.2立方米,累增油662.65吨,现场试验效果良好。通过注采两方面技术的改进与完善,有效的提高了蒸汽驱区块的纵向动用程度,改善了蒸汽驱开发效果。
[Abstract]:Steam flooding is an important replacement technology for heavy oil conversion and development in Liaohe Oilfield. It has been applied and popularized in many blocks. However, with the extension of the application time and the expansion of the application area of steam flooding technology, the uneven vertical production of oil layers appears in some blocks, which affects the steam drive production efficiency. Although the technology of eccentric steam drive injection has been developed in the early stage to improve the degree of vertical production of oil layers, the technology changes the distribution of steam at different layers by using the fishing device for downhole eccentric steam distribution valve, but in the process of application, because of the long term steam injection of the pipe string, There are some degree of deformation of steam injection pipe string, scale formation of eccentric steam distribution cylinder, low success rate of fishing and difficulty of steam injection well dynamic control, which affect steam injection effect. At the same time, at present, in the steam drive production wells, because of the inherent pressure imbalance in each reservoir, the interlayer interference appears in the longitudinal of the production wells, which greatly reduces the productivity of the wells. In this paper, based on the previous research, combined with the current situation and characteristics of steam drive development, the technology of steam drive concentric two-layer injection is developed, and the pipe string structure is optimized. The calculation model of wellbore pressure, temperature, dryness and wellbore heat loss is established, and the steam injection parameters are optimized. The field application shows that the technology can meet the requirements of reservoir injection allocation and can realize the dynamic regulation of steam injection rate in the upper and lower layers at the well head. Up to 2014, the technology has been applied in Liaohe oil field steam flooding block for 19 times, the successful rate of construction is 100, the measure efficiency is 100, the cumulative increase of oil is 4.9 脳 104 tons, and good application effect has been obtained. At the same time, according to the characteristics of steam drive production well, the steam drive stratified oil recovery technology has been developed, and the laboratory intermediate test and field test have been carried out. The testing well has a period of 373 days, which is 44 days longer than the period of general production and pump inspection in this well. Accumulative increase liquid 2787.2 cubic meters, cumulative oil 662.65 tons, field test results are good. Through the improvement and perfection of injection and production technology, the vertical production degree of steam flooding block is improved effectively, and the development effect of steam flooding is improved.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.44

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