朝阳沟低渗透油田采收率计算方法研究

发布时间：2019-06-19 04:37

【摘要】：近几年朝阳沟油田主要开展的科研与现场试验围绕的一个中心就是提高采收率,增加可采储量,因此提高采收率技术是朝阳沟油田科研的主要内容。但是目前各种计算采收率的公式对低渗透-特低渗透油田来说并不适用,由于这些采收率计算公式没有考虑到有效驱动体系及砂体连通方式、连通方向等条件对采收率的影响,计算出来的采收率与实际开发情况相差较大,特别对于目前在300m井距无法建立起有效驱动体系的三类区块来说,相差更大。例如朝2东区块,用各种方法计算的采收率平均是14.8%,而实际该区块目前已全部关井,采出程度只有2.0%,这与计算的采收率值相差太大,因此开展本课题,研究出适合低渗透-特低渗透油田的采收率计算方法。本研究应用实验资料计算了朝阳沟油田一、二、三类区块的最大水驱采收率;评价了各种驱替规律曲线计算低渗透油田水驱采收率存在的问题,提出了考虑有效驱动体系的水驱采收率计算方法。该方法考虑了水驱控制程度与井距、注采井数比、砂体大小的关系,提出了有效驱动系数计算方法,在此基础上,应用数值模拟方法计算了朝阳沟油田一、二、三类区块井网与裂缝不同方位、油水井不同连通程度条件下的驱替效率,对油层非均质性和不同相对渗透率曲线进行了校正,最终提出了适合朝阳沟低渗透油田的采收率综合计算方法。
[Abstract]:In recent years, one of the main scientific research and field tests in Chaoyang Gou Oilfield is to improve oil recovery and increase recoverable reserves, so enhanced recovery technology is the main content of scientific research in Chaoyang Gou Oilfield. However, at present, all kinds of formulas for calculating oil recovery are not suitable for low permeability and ultra low permeability oilfields. Because these formulas do not take into account the influence of effective driving system, sand body connection mode, connection direction and other conditions on recovery, the calculated recovery is quite different from the actual development situation, especially for the three types of blocks where effective driving system can not be established at 300m well spacing. For example, in Chao2 East Block, the average recovery calculated by various methods is 14.8%, but in fact, all the wells in this block have been closed at present, and the recovery degree is only 2.0%, which is too different from the calculated recovery rate value. Therefore, the oil recovery calculation method suitable for low permeability and ultra low permeability oil fields has been developed in this paper. In this study, the maximum water drive recovery in the first, second and third blocks of Chaoyang Gou Oilfield is calculated by using the experimental data, the problems existing in the calculation of water drive recovery in low permeability oil fields by various displacement law curves are evaluated, and the calculation method of water drive recovery considering effective driving system is put forward. This method takes into account the relationship between water drive control degree and well spacing, injection-production well number ratio and sand body size, and puts forward an effective driving coefficient calculation method. On this basis, the displacement efficiency of well pattern and fracture in Chaoyang Gou Oilfield is calculated by using numerical simulation method, and the reservoir heterogeneity and different relative permeability curves are corrected. Finally, a comprehensive calculation method of oil recovery suitable for Chaoyang Gou low permeability oil field is put forward.
【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】：TE327

【相似文献】