泽70高温断块油藏深部调剖技术研究

发布时间：2019-02-24 12:53

【摘要】：华北油田泽70高温断块是一个受岩性因素影响的多层砂岩构造油藏,原油黏度较大,地层温度较高,随着开采的进行,目前存在很多问题。本文系统分析了泽70部分注水井历年开展过的调剖情况后发现,存在调剖剂注入工艺不符合需要,堵剂与地层配伍性差,强度较低,耐温性抗盐性较差,易碎易流失等问题。这些问题使得措施后注水压力下降较快,各轮次调剖后对应采油井在短时间内液量增加、油量增加,然后迅速回落;同时存在剖面改善效果差,油井出水严重,经济效益降低等问题;针对以上存在的问题,我们认为目前的调剖剂和调剖工艺都不能满足泽70断块现在的调剖需求。为此有必要改善现有的技术和思路,在剩余油分布研究的基础上,开展区块综合治理技术,提出研制具有耐温抗盐性的新型聚合物冻胶,配合使用缓膨高强颗粒以及驱油表面活性剂,改进原有的深部调剖工艺技术,采用低压小排量组合段塞式注入聚合物的方法等改善措施。最后,本文在泽70断块选择一组存在问题较严重的典型注水井组,该井组使用上述研制的调剖体系后,测得吸水剖面显示:物性较好的上部层得到封堵,物性较差的下部层系得到了启动;该水井对应的油井井组含水由措施前的78.4%下降到目前的68.5%,日增油3.9t;措施后吸水指数和措施前相比降低了63.6%。表明该体系能够很好地适应泽70高温断块的油藏特征,可以有效改善注水井的吸水剖面,层间矛盾得到了初步缓解;并且对应的油井也取得了较好的增油降水效果。所以我们认为该调剖体系能很好解决泽70断块多轮次调剖存在的问题,并且对今后在该区块进行注水井调剖作业有着极其重要的指导意义。
[Abstract]:Ze 70 high temperature fault block in Huabei Oilfield is a multilayer sandstone structural reservoir affected by lithologic factors. The viscosity of crude oil is high and the formation temperature is high. With the development of exploitation, there are many problems at present. After systematically analyzing the profile control of some water injection wells in Ze 70 over the years, it is found that the profile control agent injection process does not meet the requirements, the compatibility of the plugging agent with the formation is poor, the strength is low, the temperature tolerance is poor, the salt resistance is poor, and the fracture is easy to be lost, and so on. These problems make the water injection pressure drop faster after the measures, and the oil quantity increases in a short period of time, and then drops down quickly. At the same time, there are some problems, such as poor profile improvement, serious well effluent and low economic benefit, etc. In view of the above problems, we think that the present profile control agent and profile control technology can not meet the profile control needs of Ze 70 fault block. Therefore, it is necessary to improve the existing technology and train of thought. On the basis of the research on the distribution of remaining oil, the comprehensive treatment technology of the block is carried out, and a new type of polymer gel with high temperature and salt resistance is proposed. With the use of slowly expanding high strength particles and oil displacement surfactants, the original deep profile control technology was improved, and the polymer injection method of low pressure and small displacement combined slug was adopted. Finally, this paper selects a group of typical injection wells with serious problems in Ze 70 fault block. After using the profile control system developed above, the water absorption profile shows that the upper layer with good physical properties is blocked. The lower layer with poor physical properties was started. The water cut of the well group corresponding to this well decreased from 78.4% before the measure to 68.5% at present, and the daily oil gain was 3.9 t, and the water absorption index decreased 63.6% after the measure compared with that before the measure. The results show that the system can adapt well to the reservoir characteristics of Ze 70 high temperature fault block, can effectively improve the water absorption profile of water injection wells, and the interlayer contradiction has been alleviated preliminarily, and the corresponding oil wells have also achieved better effect of increasing oil and reducing water. Therefore, we think that the profile control system can solve the problem of multiple rounds profile control in Ze 70 fault block, and it has an extremely important guiding significance for the profile control operation of water injection wells in this block in the future.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE347

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