洼59重力泄水辅助蒸汽驱技术研究与应用

发布时间：2018-07-02 21:47

本文选题：洼59 + 重力泄水　；参考：《东北石油大学》2015年硕士论文

【摘要】：洼59块S3油层为一受构造控制的厚层块状边底水特-超深层超稠油油藏,该块于1997年采用100m井距、正方形井网、蒸汽吞吐方式投入开发。截止2009年9月,该油藏已出现高采出程度、高吞吐轮次、低周期油汽比、油藏低压举升难度大等开发问题,转换开发方式迫在眉睫。然而目前成熟的蒸汽驱、SAGD、热水驱等稠油主体技术都不适合该块开发。重力泄水辅助蒸汽驱是辽河油田的原创技术,是一种深层超稠油油藏吞吐后提高采收率的新技术。根据油藏特点及开发现状,对洼59重力泄水辅助蒸汽驱进行了井网井距设计、注采参数优化设计和转驱时机研究,通过数值模拟技术,明确了注入水平井、排液水平井和直井之间的相互距离,并结合油藏地质开发特征,设计了注汽水平井与排液水平井正对;注汽水平井、排液水平井平面斜交,回型直井;注汽水平井、排液水平井平行错置等三种井网。根据洼59重力泄水辅助蒸汽驱油藏方案设计要求,开展了该油藏注汽工艺研究、举升工艺研究、监测工艺研究与配套工艺研究。通过汽水分离器、高效隔热管柱、环空注氮隔热、双管注汽、多点注汽的优化配合解决了洼59重力泄水辅助蒸汽驱注汽井筒热损失大、高干度注汽难,水平段均匀动用困难等难点;优选了洼59重力泄水辅助蒸汽驱的举升方式,解决了油藏埋藏较深、大排量高温排液举升较困难等难点,保证了水平生产井有效泄水,为蒸汽腔的扩展降低了压力,提供了空间。洼59于2009年10月开始进行重力泄水辅助蒸汽驱试验,截止2013年12月,洼59块已实施重力泄水辅助蒸汽驱井组8个,实施效果显著,井组产量持续上升,日产油由初期的30t/d上升目前的204t/d,瞬时油汽比达到0.23,累积油汽比0.16,阶段增产原油18.27万吨,增油效果明显,有效缓解了洼59产量递减形势,大幅度提高了油藏采收率。
[Abstract]:The S3 oil reservoir of block WA 59 is a thick layer block, bottom water, ultra-deep super heavy oil reservoir controlled by structure. In 1997, the block adopted 100m well spacing, square well pattern and steam huff and puff mode to be put into development. As of September 2009, the reservoir has appeared the development problems such as high production degree, high times of huff and puff, low period oil / steam ratio, high difficulty of raising low pressure, and so on, so it is urgent to change the development mode. However, the main technologies of steam flooding and hot water flooding are not suitable for the development of this block. Gravity drainage assisted steam flooding is an original technology in Liaohe Oilfield and a new technology for enhancing recovery after huff and puff in deep and super heavy oil reservoirs. According to the reservoir characteristics and present development situation, well spacing design, injection-production parameter optimization design and timing study are carried out for WA59 gravity drain assisted steam drive. Through numerical simulation technology, the injection horizontal well is determined. The distance between the horizontal well and the horizontal well, and combining with the geological development characteristics of the reservoir, the authors have designed the horizontal well for steam injection and the horizontal well for the discharge of liquid; the horizontal well for steam injection, the horizontal well for the drainage, the horizontal well for the return type; the horizontal well for the injection of steam and water, the horizontal well for the horizontal well, the horizontal well for the horizontal well, There are three kinds of well pattern, such as parallel misplacement of horizontal well. According to the design requirements of WA59 gravity drainage auxiliary steam drive reservoir, the steam injection technology, lifting technology, monitoring technology and supporting technology of the reservoir are studied. Through the optimization of steam separator, high-efficiency heat insulation pipe string, nitrogen injection and insulation in annulus, double pipe steam injection and multi-point steam injection, the heat loss of steam injection wellbore and the difficulty of steam injection with high dryness are solved in the steam injection wellbore of the auxiliary steam drive with gravity discharge of water by WA59. The difficulty of even producing horizontal section is difficult, the lifting mode of Wax59 gravity drainage auxiliary steam drive is selected, the difficulty of deep reservoir burial and high temperature liquid lifting with large displacement is solved, and the effective drainage of horizontal production well is ensured. It reduces the pressure and provides space for the expansion of the steam chamber. In October 2009, WA59 began to carry out gravity drainage auxiliary steam drive test. As of December 2013, Wak59 block has implemented 8 gravity drain auxiliary steam drive wells, with remarkable effect and continuous increase of well group output. The daily oil production increased from the initial 30t/d to 204t / d, the instantaneous oil-steam ratio reached 0.23, the cumulative oil-steam ratio reached 0.16, and the oil production increased by 182700 tons at the stage. The effect of increasing oil production was obvious, which effectively alleviated the declining situation of the production of WA59 and greatly improved the oil recovery.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE345

【参考文献】