G18块弱凝胶调驱体系调驱效果的室内研究

发布时间：2018-04-17 12:47

  本文选题：弱凝胶 + 调驱　； 参考：《东北石油大学》2015年硕士论文

【摘要】：G18块的弱凝胶调驱体系受区块水质影响严重、成胶性差,调驱效果不理想,针对这一问题进行了体系配方优化和产出水配制调驱体系的实验研究,实验通过测定不同配方体系粘度和成胶强度进而对弱凝胶配方进行优化,实验结果表明,调驱体系的合理聚合物浓度范围为0.15%～0.2%,交联剂浓度的范围为0.15%-0.25%；且现有的G18块现场3种产出水,以不同比例混合后的水配制调驱体系均能成胶,但成胶强度不同。对水质中影响体系成胶性能的因素开展的分析实验显示,配液水中固相颗粒的粒径越大、含量越高成胶性能变差,综合考虑,配液水应满足悬浮颗粒含量_30mg/L、悬浮颗粒粒径中值8μm;矿化度对调驱体系的成胶性能影响很大,随着矿化度增加、调驱体系的成胶性能变差,当矿化度达到7000mg/L时该体系不能成胶；配液水中含油量≤20mg/L、SRB含量≤102个/mL时对调驱体系的成胶性能没有影响；配制用水的最佳PH值为7。调驱体系的岩心调驱实验结果表明,随着调驱体系注入量的增大,采出程度增大,含水率下降幅度增大,最大驱替压差增大,总采收率增大。兼顾调驱效果与经济效益,选择0.2PV为最佳注入量：当含水达到中高含水期以后,调驱时机越早,采出程度越高,可以提前进行调驱,这样也可以缩短开采时间；而随着调驱体系注入速度的增大,调驱采出程度减小,含水率下降幅度减小,最大驱替压差增大,总采收率减小。
[Abstract]:The weak gel control and flooding system of block G18 is seriously affected by the water quality of block, the gelation property is poor, and the effect of adjusting and flooding is not ideal. In view of this problem, the system formula optimization and production water preparation of the system are studied experimentally.The weak gel formulation was optimized by measuring the viscosity and gelling strength of different formulations.The reasonable polymer concentration ranges from 0.15 to 0.2and the crosslinking agent concentration ranges from 0.15 to 0.25.The three kinds of water produced from the existing G18 block can be gelatinized by mixing water with different proportions, but the gelling strength is different.The analysis of the factors that influence the gelling property of the system in water quality shows that the larger the particle size of solid phase in the mixed water, the worse the content of Gao Cheng gum, and the more comprehensive consideration is.The distribution water should satisfy the suspended particle content of 30 mg / L and the median of suspended particle size 8 渭 m. The salinity has a great influence on the gelatinization performance of the adjusting flooding system. With the increase of salinity, the gelatinization performance of the modified flooding system becomes worse, and when the salinity reaches 7000mg/L, the system can not form gelling.When the oil content in the water is 鈮，

本文编号：1763672