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Mechanism study on multi-round profile control technique in fractured water flooding reservoir
He Tao,Wang Jian,Yu Heng,Xu Peng,Liu Xuwen
Reservoir Evaluation and Development    2018, 8 (2): 68-72.   DOI: null
Abstract   (176 HTML7 PDF(pc) (1977KB)(148)  

In order to discuss the technical measures of the multi-directional water breakthrough, it is essential to find out the water breakthrough discipline and the understand the mechanism of the multi-round profile control technique. Therefore, we designed and the established the fracture-matrix visualization model with one-injection well for three production wells. The permeability between the different injection-production ends was inequality. By this model, we studied the migration characteristics and the plugging mechanism of the gel, the fluid diverting of subsequent water flooding and the distribution characteristics of the residual oil on the condition of the fracture-matrix. Through the core flow experiment of the shunt-wound sand-filled pipes with different permeability. And by the simulation of the interlayer heterogeneity, we compared the experimental data of the single and multi-round profile control measures. The results show that the multi-round profile control can fully play the synergistic effect to improve the performance and plug the fractured seepage channel effectively along with the promotion of the fluid diverting, and the profile control effect reduces with time of the injection. The multi-round profile control technique is better than the single profile control technique in the respect of adapting the fractured geological structure, and has a better effect on relieving the interlayer contradiction.


填砂管
编号
渗透率/
μm2
水驱(调剖前)
相对吸水量,%
单次调剖后
相对吸水量,%
1# 7.48 70.00 38.36
2# 2.99 28.18 56.21
3# 0.68 1.82 5.43
Table 2 Single profile control results of parallel filling pipes
Extracts from the Article
实验室采用三根并联填砂管,模拟不同渗透率级差下的多方向见水油藏分别进行单次调剖与多级调剖并将结果进行对比.并联填砂管单次调剖实验结果见表2,并联填砂管多级调剖实验结果见表3.相对吸水量为单根填砂管吸水量占三根填砂管总吸水量的比值.由分析结果可知,单次调剖对模型吸水剖面改善程度较多级调剖中的第一轮次调剖的结果好,但和经过二轮,三轮调剖后的结果比较则较差,单次调剖中弱凝胶集中进入相对高渗的流道,调剖后渗透率级差依然较大;多级调剖中由于上一轮弱凝胶的注入已经起到了部分改善吸水剖面的作用,缩小了渗透率级差,使得后一轮弱凝胶的注入更为分散,说明多级调剖可以更好地改善吸水剖面,缓解储层非均质性对油藏水驱效果的影响.多级调剖可以更好起到动态封堵高渗层,启动低渗层的渗流通道的作用.
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