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在完井和修井过程中为了很好地控制流体的漏失,在高渗透油藏中运用了高强度交联凝胶。这种交联凝胶也广泛地用于阻挡气顶和底水侵入生产井,提高邻近井在天然裂缝中或高渗透地层中注入剖面的波及效率。为了保证有效的凝胶充填,在交联凝胶的各种应用中,对凝胶处理方法的合理设计是非常严格的。在胶凝作用完成之后,凝胶设计中的一个重要可变参数是建立凝胶系统动力学和凝胶强度的流变学参数。凝胶的流变性和胶凝速率取决于流变方法或通过容器测试利用凝胶强度标准进行定性分析。流变参数的测定既耗时又费钱,同时由于凝胶强度标准的主观性,容器测试有可能会导致错误的凝胶描述。本文描述了用以检测凝胶交联速率、确定凝胶强度的核磁共振方法。这项技术提供了一种既快速又准确的确定凝胶强度、测定凝胶交联过程的方法。通过校正聚合物浓度、交联剂浓度、凝胶的存储时间以及与地层水的配伍性来确定核磁共振参数。在相同的化学条件下,用弱磁场核磁共振法得到的结果与交联反应的动力学流变性测试是一致的,同时这种技术不会以任何形式破坏凝胶的交联过程,可以检测到凝胶形成过程中液固两相间的变化,确定交联点。
In order to control the fluid loss well during completion and workover, high-strength cross-linked gels are used in high-permeability reservoirs. This cross-linked gel is also widely used to block the entry of gas and bottom water into production wells and to increase the efficiency of injection of adjacent sections into natural fractures or high permeability formations. In order to ensure efficient gel filling, a reasonable design of the gel treatment method is very strict in various applications of the cross-linked gel. An important variable parameter in gel design after gelation is completed is the rheological parameters that establish the kinetics and gel strength of the gel system. The rheology and gelation rate of the gel are qualitatively determined using the gel strength criteria, depending on the rheological method or through the container test. The determination of rheological parameters is both time-consuming and costly, and container testing may lead to erroneous gel descriptions due to the subjectivity of gel strength standards. This article describes a nuclear magnetic resonance method for detecting the gel cross-linking rate and determining the gel strength. This technique provides a quick and accurate way to determine the gel strength and determine the gel cross-linking process. Nuclear magnetic resonance parameters were determined by correcting for polymer concentration, crosslinker concentration, gel storage time, and compatibility with formation water. Under the same chemical conditions, the results obtained with the weak magnetic field nuclear magnetic resonance method are consistent with the kinetic rheological tests of the crosslinking reaction, and at the same time this technique does not undermine the crosslinking of the gel in any way and can be detected The formation of gel during liquid-solid two-phase change, to determine the crosslinking point.