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首页> 中文期刊> 《石油钻探技术》 >苯丙胶乳水泥浆防气窜效果与失重规律分析

苯丙胶乳水泥浆防气窜效果与失重规律分析

         
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摘要

During the WOC of cement slurry, gas channeling in the annulus caused by its weight loss is one of the important factors leading to the sustained casing pressure (SCP). Understanding the weight loss modes and law of cement slurry is an important way to prevent gas intrusion in the annulus. Taking the styrene-acrylic latex anti-gas channeling cement slurry system as the research object, the weight loss test of cement slurry was carried out by means of pressure conduction precision measuring device, and the pressure change data of cement slurry under different latex dosage, temperature, gas pressure and simulated wellbore depth were measured, and the anti-gas channeling effect evaluation and weight loss law analysis were carried out. The test found that the styrene-acrylic latex could still effectively prevent gas channeling when the gas-bearing formation pressure (18 kPa) was higher than the bottom pressure of slurry column (12-16 kPa). In this case, the pressure dropped rapidly after this system formed a thixotropic or gelled structure. As the hydration reaction went on, the pressure decreased slowly, then the pressure of cement slurry dropped rapidly again before the thickening, and the dangerous time of gas channeling should appear near the first inflection point. Based on the research results, the anti-gas channeling performance of cement slurry could be evaluated to select the anti-gas channeling cement slurry system suitable for high-pressure gas wells, and such results could provide test basis for the establishment of cement slurry weight loss prediction model.%水泥浆候凝期间,因其失重引发的环空气窜,是导致气井环空带压的重要因素之一,掌握水泥浆失重模式与规律,是预防环空气侵的重要基础.以苯丙胶乳防气窜水泥浆为研究对象,采用压力传导精确测量装置进行了水泥浆失重试验,测量了不同胶乳加量、温度、气压、模拟井筒深度等条件下水泥浆浆柱压力的变化,进行了防气窜效果评价与失重规律分析.试验发现:在气层压力(18kPa)高于底部浆柱压力(12～16kPa)的情况下,苯丙胶乳水泥浆依然可有效防止气窜;水泥浆形成触变或胶凝结构后压力快速降低,随着水化反应进行压力缓慢降低,稠化前压力再次加速下降,而气窜应出现在第一拐点附近.基于该研究成果,可对水泥浆的防气窜性能进行评价,以优选出适合高压气井的防气窜水泥浆,并为建立水泥浆失重预测模型提供试验基础.

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  • 来源
    《石油钻探技术》 |2019年第1期|52-58|共7页
  • 作者

    陆沛青; 桑来玉; 谢少艾; 高元; 张佳滢; 康旭亮;

  • 作者单位

    页岩油气富集机理与有效开发国家重点实验室;

    北京 100101;

    中国石化石油工程技术研究院;

    北京 100101;

    页岩油气富集机理与有效开发国家重点实验室;

    北京 100101;

    中国石化石油工程技术研究院;

    北京 100101;

    中石化石油机 械股份有限公司;

    湖北武汉 434014;

    页岩油气富集机理与有效开发国家重点实验室;

    北京 100101;

    中国石化石油工程技术研究院;

    北京 100101;

    油气资源与探测国家重点实验室(中国石油大学(北京));

    北京 102249;

    页岩油气富集机理与有效开发国家重点实验室;

    北京 100101;

    中国石化石油工程技术研究院;

    北京 100101;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 TE256+.7;
  • 关键词

    固井; 防气窜; 胶乳水泥浆; 失重试验; 失重模式; 失重规律;

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