聚合物驱注入工艺参数优化及驱油机理研究
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国家科技重大专项“大型油气田及煤层气开发”(项目编号2016ZX05007-002)


Injection Parameters Optimization and Displacement Mechanism of Polymer Flooding
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    摘要:

    为提高陆地B油田二类储层的聚合物驱效果,以目标储层特征和流体性质为研究对象,通过开展层内非均 质岩心模型的室内驱替实验,优选适合目标储层的最佳注入参数及注入方式。研究结果表明:随着聚合物相对 分子质量及溶液浓度的增加,聚合物分子聚集体尺寸增大,阻力系数和残余阻力系数增大,但由于受到岩心孔喉 剪切作用的影响,残余阻力系数升幅逐渐变小。从驱油实验可以看出,聚合物注入黏度对开采效果影响依次为: 梯度增黏>交替变黏>梯度降黏>单一高黏>单一低黏。其中梯度增黏、交替变黏与梯度降黏采收率增幅较大,增 幅达到20%以上,梯度增黏提高采收率效果最优,采收率增幅为24.2%。聚合物注入速率对开采效果影响依次 为:梯度增速>单一高速>变速交替>梯度降速>单一低速。其中梯度增速与交替变速采收率增幅较大,梯度增速 采收率增幅为25.6%。在注入段塞尺寸一定条件下,不同组合注入方式下采收率增幅效果为:增速降黏>降速增 黏,其中增速降黏组合方式采收率提高幅度为28.6%。由此可见,注入过程中同时改变注入速率和注入黏度的组 合方式相比于单一改变注入速率或黏度的增油降水效果更好。

    Abstract:

    In order to improve the polymer flooding effect of class II reservoir in land B oilfield,taking the characteristics of target reservoir and fluid properties as the research object,the best injection parameters and injection methods suitable for the target reservoir were optimized by carrying out the indoor displacement experimental of heterogeneous core model in the layer. The experimental results showed that,with the increase of polymer molecular weight and solution concentration,the size of polymer molecular aggregates increased,the resistance coefficient and residual resistance coefficient increased,but due to the influence of core pore throat shear,the amplification of residual resistance coefficient gradually decreased. It could be seen from the oil displacement experiment that the influence of polymer injection viscosity on the production effect was as follows,gradient viscosity increasing > alternating viscosity changing > gradient viscosity decreasing > single high viscosity > single low viscosity. Among them,the oil recovery of gradient viscosity increasing,alternate viscosity changing and gradient viscosity reducing was enhanced by more than 20%,and the oil recovery of gradient viscosity increasing was the best,being of 24.2%. The influence of polymer injection rate on production effect was as follows,gradient speed increasing > single high speed > alternate speed changing > gradient speed decreasing > single low speed. Among them,the oil recovery of the gradient speed increasing and alternating speed changing was enhanced greatly,and oil recovery of the gradient speed increasing was 25.6%. Under the condition that the injection slug size was fixed,the increasing effect of oil recovery under different combination injection methods was as follows:speed increasing and viscosity reducing > speed decreasing and viscosity increasing,and the enhanced oil recovery under the combination of speed increasing and viscosity reducing was 28.6% . It could be seen that the combination of changing injection speed and viscosity at the same time in the process of injection was better than that of single changing speed or viscosity.

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  • 在线发布日期: 2022-04-25
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