杏北开发区二、三类油层水驱深度调剖技术研究
发布时间：2018-12-11 09:17
【摘要】：水驱开发进入特高含水期后,经过加密调整和综合治理,单砂体注采关系不断完善,低渗透薄差油层动用程度提高,受注入水长期冲刷的影响,部分储层形成高渗透条带,注入水沿优势通道,形成低效无效循环,降低了水驱油的效率,一方面使油井过早水淹,另一方面抑制了低渗高饱和油层的产能发挥,最终影响采收率的提高。水驱深度调剖技术作为机械细分注水的有力补充和完善,对油田开发起着重要的作用。通过水驱深度调剖,减少层间差异,调整平面矛盾,改善油层的动用状况,控制平面上低效、无效水循环,从而进一步扩大水驱波及体积,减缓含水上升速度、产量递减幅度。本文首先对二三类油层深度调剖体系进行研究,对二类油层所使用的铬微凝胶体系进行评价,确定最佳使用方案为:聚合物浓度≥1000mg/L,交联剂浓度≥40mg/L,聚交比大于20。其中低浓度交联调剖剂配方(聚合物1000~1200mg/L+交联剂40~60mg/L),聚交比15~30,成胶时间大于1天,流动性好,用作深度调驱的主体段塞;成胶强度大的调剖剂配方(聚合物1200~1500mg/L+交联剂100~150mg/L),聚交比10~15,成胶时间小于24小时,粘度较大,用作起封堵作用的后尾段塞,侯凝最佳时间为7-10天,之后对三类油藏所使用的纳米微球体系的封堵性进行评价,并在此基础上展开了并联岩心室内驱油实验研究,认为纳微米微球在通过低渗断面后,在中渗断面仍然可以形成有效封堵,较好的改善了注入剖面。在完成调剖体系室内评价后,对调剖井跟踪评价方法进行了调整,并最终应用于采油二厂二、三类油藏。通过矿场实验,二类油层采出井含水下降,产量递减幅度得到减缓,投入产出比1:3以上,最终提高采收率0.31%;三类油层调剖后产量增加,含水下降,投入产出比1:1.6以上,最终提高采收率0.35%,矿场实验取得了良好的经济效益,且对相似油藏的开发提供了现实指导。
[Abstract]:After the water drive development enters into the extra high water cut period, after the infilling adjustment and comprehensive treatment, the relationship between injection and production of single sand body is constantly improved, the production degree of low permeability thin and differential oil layer is improved, and some reservoirs are formed high permeability strip due to the effect of long term scour of injected water. The injection water forms inefficient and ineffective circulation along the dominant channel, which reduces the efficiency of water flooding. On the one hand, it causes premature flooding of oil wells, on the other hand, it inhibits the productivity of low permeability and high saturation reservoirs, which ultimately affects the improvement of oil recovery. As a powerful supplement and consummation of mechanical subdivision water injection, water drive depth profile control technology plays an important role in oilfield development. Through the depth profile control of water drive, reducing the difference between layers, adjusting the plane contradiction, improving the production condition of the reservoir, controlling the low efficiency and invalid water cycle on the plane, further expanding the swept volume of water drive, slowing down the rising speed of water cut and decreasing the production range. In this paper, the depth profile control system of two or three types of oil layers was studied, and the chromium microgel system used in the second class oil layer was evaluated. The optimum application scheme was determined as follows: polymer concentration 鈮，
本文编号：2372295
[Abstract]:After the water drive development enters into the extra high water cut period, after the infilling adjustment and comprehensive treatment, the relationship between injection and production of single sand body is constantly improved, the production degree of low permeability thin and differential oil layer is improved, and some reservoirs are formed high permeability strip due to the effect of long term scour of injected water. The injection water forms inefficient and ineffective circulation along the dominant channel, which reduces the efficiency of water flooding. On the one hand, it causes premature flooding of oil wells, on the other hand, it inhibits the productivity of low permeability and high saturation reservoirs, which ultimately affects the improvement of oil recovery. As a powerful supplement and consummation of mechanical subdivision water injection, water drive depth profile control technology plays an important role in oilfield development. Through the depth profile control of water drive, reducing the difference between layers, adjusting the plane contradiction, improving the production condition of the reservoir, controlling the low efficiency and invalid water cycle on the plane, further expanding the swept volume of water drive, slowing down the rising speed of water cut and decreasing the production range. In this paper, the depth profile control system of two or three types of oil layers was studied, and the chromium microgel system used in the second class oil layer was evaluated. The optimum application scheme was determined as follows: polymer concentration 鈮，
本文编号：2372295
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