北一二排西二三次井网重构与效果评价

发布时间：2018-07-07 23:29

本文选题：井网重构 + 数值模拟　；参考：《东北石油大学》2017年硕士论文

【摘要】：北一二排西水驱进入特高含水开发期,受自身平面非均质性较强影响,原开发井网出现了剩余油高度分散、单砂体间注采井距不均衡、注采关系不完善等矛盾,导致地下油水分布总格局发生了重大变化,原井网适应性显著降低,迫切需要开展井网重构研究。对北一二排西井网重构前开发效果进行了评价。评价发现研究区目前产量递减快,含水率高,含水上升快;控制程度和有效动用程度低;剩余油高度分散;单砂体间注采井距不均衡,注采关系不完善等问题。进行精细地质建模与数值模拟。运用Petrel地质建模软件,建立了北一二排西精细地质模型。运用Eclipse进行数值模拟,2015年8月后,剩余油主要分布在SII1-SII9和PII的薄差油层,需要通过“二三次井网重构(互相完善注采关系)”挖潜。制定了以补孔、封堵和转注三种措施为主的井网重构方案。补孔方案包括143口油井,52口水井,1889个补孔点;封堵方案包括46口油井,16口水井,263个封堵点;转注75口油井。从2015年8月开始进行井网重构,到2016年10月措施基本完成。目前,水驱井网有320口油井,247口注入井,其中包括112口注聚井和135口注水井。对井网重构后开发效果进行了评价。(1)2015年进行井网重构调整,水驱井网递减速度减缓,累产油量增幅小幅提升;各油组年产液量下降速度有不同程度缓减,水驱井网各油组的累产液量增幅趋于平缓,总体处于上升趋势。水驱井网递减率由原来的0.0570降低到0.0529,各油组递减率也有不同程度的降低。2016年10月全区含水率94.70%,较井网重构前下降了1.49个百分点。同时有效抑制研究区各油组含水上升率增长,措施效果明显。(2)考虑研究区井网井距、断层断点数据以及油水井所处沉积相,形成了一套连通库的计算方法,建立了水驱井网及聚驱井网连通库。运用连通库数据,根据水聚驱井网控制程度计算方法,确定了水聚驱井网50个小层控制程度。井网重构后水驱井网控制程度由79.23%提高到85.77%,提高了6.54个百分点,控制程度由中等水平转为好;聚驱井网重构后控制程度由72.13%提高到75.90%,提高了3.77个百分点。(3)运用定义法和水驱曲线法对研究区水驱井网动用程度进行研究。井网重构后动用程度由39.35%提高到43.57%,提高了4.22个百分点,井网重构后动用程度水平差。根据当前各油水井的生产制度,运用Eclipse数值模拟软件,定液量生产,进行中长期开发效果预测。油藏工程方法和数值模拟方法确定井网重构后采收率为44.330%,比井网重构前采收率增长0.585个百分点,达到预期调整效果。
[Abstract]:During the development period of the water flooding in the north and second rows of the west, due to the strong influence of its own plane heterogeneity, the original development well pattern appeared some contradictions, such as highly dispersed remaining oil, uneven injection-production interval between single sand bodies, imperfect injection-production relationship, etc. As a result, the total pattern of underground oil and water distribution has changed greatly, and the adaptability of the original well pattern has been significantly reduced, so it is urgent to carry out well pattern reconstruction research. The development effect of the well pattern before reconstruction was evaluated. The evaluation found that the production decline rapidly, the water cut is high, the water cut is rising rapidly in the research area, the degree of control and effective production is low, the remaining oil is highly dispersed, the injection-production well distance between single sand bodies is not balanced, the relationship between injection and production is not perfect, and so on. Fine geological modeling and numerical simulation are carried out. Using Petrel geological modeling software, the fine geological model of Bei Yi er Pai Xi is established. After August 2015, the remaining oil is mainly distributed in thin and differential oil layers of SII1-SII9 and PII, and needs to be tapped through "secondary and tertiary well pattern reconstruction (perfect injection-production relationship)". The reconstruction scheme of well pattern is established, which is based on three kinds of measures: filling hole, sealing and transferring injection. The plugging scheme includes 143 wells with 52 wells and 1889 filling points, 46 wells with 16 wells with 263 plugging points, and 75 wells with injection. The reconstruction of well pattern began in August 2015, and the measures were basically completed in October 2016. At present, there are 320 wells with 247 injection wells, including 112 polymer injection wells and 135 injection wells. The development effect after well pattern reconstruction was evaluated. (1) in 2015, the well pattern was adjusted, the decline rate of water drive well pattern was slowed down, the increment of cumulative oil production was increased slightly, and the decreasing rate of annual liquid production of each oil group was slowed down in varying degrees. The increasing rate of cumulative liquid production of each oil group in water drive well pattern tends to be gentle, and it is on the rise as a whole. The decline rate of water drive well pattern is reduced from 0.0570 to 0.0529, and the decline rate of each oil group is also decreased to some extent. In October 2016, the water cut in the whole area is 94.70%, which is 1.49% lower than that before well pattern reconstruction. At the same time, the increase of water cut rate of each oil group in the study area is effectively restrained, and the effect of the measures is obvious. (2) considering well spacing, fault fracture point data and sedimentary facies of oil and water wells in the study area, a set of calculation method of connected reservoir is formed. The water drive well network and the polymer flooding network connection library are established. Based on the data of the connected database and the calculation method of the control degree of the water flooding well pattern, the control degree of 50 small layers in the water polymer flooding well network is determined. After well pattern reconstruction, the control degree of water drive well pattern is increased from 79.23% to 85.77%, which is increased by 6.54%, and the control degree is changed from medium level to good level. The control degree of polymer flooding pattern was increased from 72.13% to 75.90%, which increased 3.77%. (3) using definition method and water drive curve method, the production degree of water drive well pattern in the study area was studied. After well pattern reconstruction, the production degree is raised from 39.35% to 43.57%, which is increased by 4.22%, and the production level is poor after well pattern reconstruction. According to the current production system of oil and water wells, using Eclipse numerical simulation software, the production of liquid quantity is determined, and the medium and long term development effect is predicted. Reservoir engineering methods and numerical simulation methods determine that the recovery factor after well pattern reconstruction is 44.330%, which is 0.585% higher than that before well pattern reconstruction, and achieves the expected adjustment effect.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE324

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