套后储层探测关键技术研究

发布时间：2018-01-11 11:27

本文关键词：套后储层探测关键技术研究　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文所述的套后储层探测技术是以瞬变电磁法为理论基础的一种过套管测电阻率方法。瞬变电磁法作为一种地球物理探测方法,由于其在时间与空间上的可分性,使得这种方法具有简单易行,探测信息丰富,精度高等特点。将瞬变电磁法套后储层技术应用在油田老井中的剩余油探测领域,可以提高油田采收率,节约测井时间,降低开发成本。本文首先介绍了瞬变电磁测井原理,构建了套后储层探测技术的六层探测模型,计算出各层介质中方向的电场强度与z方向的磁场强度,并给出了套管磁化方法。在设计完成信号采集与信号接收电路的基础上,进行影响测井信号因素的研究,通过增加滤波电路,设置合理的信号分段采样时间等方案来提高测量系统的稳定性。此外,本文还对温度测量电路、深度计数电路校准方法进行研究.一方面进行多组温度刻度试验,选出温度值与采集数据对应关系最优的一组数据,并对其做最小二乘次拟合得到理想的温度刻度曲线,计算准确出温度计数系数;另一方面对深度电路进行光电耦合处理,设计防抖动电路,选择计数性能最佳的脉冲计数芯片,增加自然伽玛辅助校深电路等方法,得到误差较小的深度计数数据。为后期的数据解释提供了较高的真实性。最后,开展了大量的现场试验,通过仪器对比同一口井上提下放时地层介质电动势趋势,得出仪器在上提下放测量的一致性,验证深度的准确性;并通过对比套管井与裸眼井的测量数据的一致性来消除接箍与扶震器的对试验数据的影响,并得到套后的地层信息;能够提供较为准确的生产井分布信息,初步达到了区分不同介质的目的。
[Abstract]:The technology of reservoir detection in this paper is based on transient electromagnetic method (TEM), which is based on the theory of transient electromagnetic method (TEM), which is used as a geophysical detection method. Because of its separability in time and space, this method is simple and easy to use, and the detection information is abundant. The application of transient electromagnetic method in the field of remaining oil exploration in old wells can improve oil recovery and save logging time. First of all, this paper introduces the transient electromagnetic logging principle, constructs a six-layer detection model of the post-reservoir detection technology, and calculates the electric field intensity in the Chinese direction and the magnetic field intensity in the z direction in each layer of media. The method of casing magnetization is given. Based on the design of signal acquisition and signal receiving circuit, the factors affecting logging signal are studied, and the filter circuit is added. In order to improve the stability of the measurement system, reasonable signal sampling time is set up. In addition, the temperature measurement circuit is also given in this paper. The calibration method of depth counting circuit is studied. On the one hand, multi-group temperature calibration tests are carried out to select a set of data with the best relationship between the temperature value and the collected data. The ideal temperature calibration curve is obtained by least square fitting, and the coefficient of thermometer is calculated accurately. On the other hand, the optoelectronic coupling processing of the depth circuit is carried out, the anti-jitter circuit is designed, the pulse counting chip with the best counting performance is selected, and the natural gamma auxiliary depth correction circuit is added. The depth count data with small error are obtained, which provides a high level of authenticity for the later data interpretation. Finally, a large number of field experiments are carried out. By comparing the trend of electromotive force of formation medium when lifting down in the same well, the consistency of measurement in lifting and downgrading of the instrument is obtained, and the accuracy of depth is verified. By comparing the consistency of measurement data between casing well and open hole, the influence of hoop and vibrator on test data is eliminated, and the formation information after casing is obtained. It can provide more accurate distribution information of production wells and achieve the purpose of distinguishing different media.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE327

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