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王庄油田郑408块沙三段属于敏感性储层,现场采用冷采、蒸汽吞吐、注入CO2、HDCS等多种开采方式,效果均不理想。在对该区块储层特征、敏感性机理深入研究的基础上,得出黏土矿物含量相对较高,其中蒙脱石含量平均高达41%,致使储层具有强~极强水敏性,因此认为黏土矿物是影响储层渗透率、制约开发效果的主要因素。蒙脱石在富钙环境中会产生钙基蒙脱石,在富钠环境中会产生钠基蒙脱石。蒙脱石具有三层水结构:表层水、层间水和晶格水,失水由易到难,当温度达到300℃时,蒙脱石失去膨胀性能;长期在高温(>800~1000℃)下,蒙脱石晶格破坏,产生相变,转化为莫来石和方石英。因此,实施注汽热采需把蒸汽温度提高到250~300℃,干度保持在70%。室内防膨静态和防膨流动实验表明,当SLAS-3防膨剂浓度为1.5%,黏土膨胀率为0,可以很好地起到抑制黏土膨胀的作用。该项成果的取得对指导王庄油田郑408块的开发具有重要的实用价值,同时也为同类油藏的开发提供了一定的借鉴。
The third section of Zheng 408 block in Wangzhuang Oilfield belongs to sensitive reservoirs. Various mining methods such as cold mining, steam huff and puff, CO2 injection and HDCS injection are adopted on site, and the results are not satisfactory. Based on the deep research on reservoir characteristics and sensitivity mechanism in this block, it is concluded that the content of clay minerals is relatively high, with an average content of montmorillonite as high as 41%. As a result, the reservoir has a strong strong water sensitivity It is considered that clay minerals are the main factors that affect the permeability of reservoirs and restrict the development effect. Montmorillonite produces calcium-based montmorillonite in a calcium-rich environment and sodium-montmorillonite in a sodium-rich environment. Montmorillonite has three layers of water structure: surface water, interlayer water and lattice water, water loss from easy to difficult, when the temperature reaches 300 ℃, montmorillonite loss of expansion; long-term high temperature (> 800 ~ 1000 ℃ ), Montmorillonite lattice damage, resulting in phase change, into mullite and cristobalite. Therefore, the implementation of steam injection heat steam temperature to be raised to 250 ~ 300 ℃, dryness remained at 70%. The experiments of indoor anti-static and anti-swelling flow show that when the concentration of SLAS-3 anti-swelling agent is 1.5% and the swelling rate of clay is 0, it can well play the role of inhibiting the expansion of clay. The achievement of this achievement has important practical value for guiding the development of Zheng 408 block in Wangzhuang Oilfield, and also provides some reference for the development of similar reservoirs.