J16块二元驱多段塞等流度注入方法研究

发布时间：2018-06-30 07:59

本文选题：二元驱 + 等流度　；参考：《东北石油大学》2015年硕士论文

【摘要】：J16块试验区实施二元驱以来,由于地层非均质性的影响,产生部分注入井单层吸液量过大,注入液在各层中的推进速度不一致,相应的采油井聚合物浓度上升较快等问题。因此需要开展二元驱多段塞等流度注入方法研究,通过高渗通道局部截流提高压力梯度来解决这种矛盾。通过开展不同分子量聚合二元体系不同粘度条件下均质岩心注入实验,进行等流度段塞设计。实验结果表明:在相同渗透率条件下,同一分子量聚合物配制二元体系流度与粘度成幂函数关系。通过开展三管并联岩心注入实验,进行等流度段塞流度控制能力研究。实验结果表明:笼统注入方式下,连续降分子量等流度注入方案对分流率控制不如单一高分子量方案好。分层分质注入时,连续降分子量注入方法可达到理想的分流率控制效果。分层分质等流度方案采出程度比单段塞笼统注入方案高出19.11%,采收率提高值主要贡献于低渗透层。通过开展三层非均质岩心驱油实验,考察多段塞等流度方法驱油效果。实验结果表明:选用单一分子量(2500×104)聚合物时,三段塞等流度二元驱油体系采出程度高于常规单段塞驱4.45%。连续将分子量4轮次等流度段塞注入时化学驱采出程度最高为35.2%,高于单段塞方案13.92%。连续降分子量4轮次注入能够更好的控制含水上升速度,长时间维持较高注入压力,更大限度增强等流度驱油效果。
[Abstract]:Since the binary flooding was carried out in block J16, due to the influence of formation heterogeneity, some problems such as too large amount of single-layer fluid absorption in some injection wells, inconsistent propelling speed of injection fluid in each layer, and rapid increase of polymer concentration in the corresponding oil wells are also discussed. Therefore, it is necessary to study the method of equal mobility injection for binary flooding with multiple slugs, and to solve this contradiction by increasing pressure gradient by local closure of high permeability channel. The constant mobility slug design was carried out through the experiments of homogeneous core injection under different molecular weight polymerization binary systems and different viscosity conditions. The experimental results show that under the same permeability condition, the mobility and viscosity of binary system prepared by the same molecular weight polymer are power function. Through three parallel core injection experiments, the fluidity control ability of constant mobility slug was studied. The experimental results show that under the general injection mode, the constant mobility injection scheme with continuous molecular weight reduction is not as good as the single high molecular weight scheme in controlling the shunt rate. Continuous molecular weight reduction injection method can achieve ideal shunt rate control effect. The recovery degree of the stratified equal mobility scheme is 19.1111 higher than that of the single slug general injection scheme, and the enhanced oil recovery mainly contributes to the low permeability layer. Through three layers heterogeneous core flooding experiment, the displacement effect of multi-slug equal mobility method was investigated. The experimental results show that the recovery degree of triple-slug iso-mobility binary flooding system is higher than that of conventional single-slug flooding with a single molecular weight (2500 脳 10 ~ 4) polymer. When the molecular weight of 4 rounds of constant mobility slug is continuously injected, the highest recovery degree of chemical flooding is 35.2g, which is higher than that of single slug scheme 13.92. Continuously reducing molecular weight 4 times injection can better control the water cut rising speed, maintain high injection pressure for a long time, and enhance the displacement effect of constant mobility oil to a greater extent.
【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】：TE357.46

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