水溶性树脂固井工作液体系*
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1.中国石化西北油田分公司石油工程技术研究院;2.中石化西南石油工程有限公司固井分公司;3.中石化江汉石油工程有限公司钻井一公司;4.西南石油大学化学化工学院

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water-soluble resin-based cementing fluid system
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School of Chemical Engineering and Technology,Southwest Petroleum University

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    摘要:

    针对油气田开发中高压油气、后期压裂、储气库周期性压力变化等带来的层间流体窜流、井口带压问题,以有机胶凝材料-水溶性树脂,研制了一种适用于中低温的树脂固井工作液体系,并对该体系的工程性能、封隔性能、树脂固化动力学等进行了研究。结果表明,该树脂体系密度在1.20~1.80g/cm3可调,流动性能良好;60~90℃时,稠化时间在60~410min可调;模拟顶替效率91.5%时,树脂固化体的胶结强度为3.01MPa,窜流突破压力大于12MPa,远高于相近顶替效率下的常规水泥石;树脂固化体90℃×24h抗压强度在50MPa以上,六次循环交变应力加载后的弹性恢复率均超过85%,优于常规水泥石;固化体热分解温度为398℃,具有良好的耐温性能;确定了S-HR/CA-1与S-HR/DCY体系的固化动力学方程、固化度与固化时间的关系。该树脂工作液体系固井界面胶结强度高,形变恢复能力强,有利于保证固井环空固化体的长期完整性和封隔性,防止窜流的发生;固化动力学方程的建立为此类树脂工作液体系的研究与应用提供了理论参考。

    Abstract:

    In view of the problems of gas channeling and wellhead pressure caused by high pressure and fracturing in the development of oil and gas fields, water-soluble resin was used as the main cementitious materials and a resin-based cementing fluid system at low and medium temperature was prepared. The engineering performance, anti-channeling ability, mechanical property, temperature resistance and curing kinetics of the system were studied. The results show that the density of the resin system can be adjusted to 1.20~1.80g/cm3 through the combination of weighting agent and suspending agent, and it has good flowing ability. The thickening time can be adjusted from 60 to 410 min by changing the dosage of curing agent and accelerator between 60℃ and 90℃. When the displacement efficiency is 91.5%, the consolidation strength of cured resin is 3.01 MPa, the interface breakthrough pressure is more than 12 MPa, which is much higher than that of conventional cement stone under similar displacement efficiency. The compressive strength of cured resin is above 50MPa after curing at 90℃ for 24h, and the elastic recovery rate is more than 85% after six cycles of alternating stress loading, which is better than that of ordinary set cement. The TG analysis demonstrates that initial decomposition temperature of cured resin is 398℃, which indicates that the resin-based cementing fluid has good temperature resistance. The curing kinetics equations of S-HR/CA-1and S-HR/DCY systems, and the relationship between curing degree and curing time was determined. The resin cementing fluid has consolidation strength and strong deformation recovery ability at the cementing interface, which is conducive to ensuring the long-term integrity and sealing performance of cementing material, and preventing fluid channeling of oil and gas wells. The study of curing kinetics provides a theoretical reference for the research and application of this kind of resin working fluid system.

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  • 收稿日期: 2020-07-24
  • 最后修改日期: 2020-10-09
  • 录用日期: 2020-10-10
  • 在线发布日期: 2021-11-04
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