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杨广国,陆沛青,高元,等. 顺北超深窄间隙固井技术应用[J]. 科学技术与工程, 2019, 19(31): 116-123.
Yang Guangguo,Lu Peiqing,Gao Yuan,et al.Study and Application on Cementing Technology in Ultra-deep Wells with Narrow Annulus in Shunbei block[J].Science Technology and Engineering,2019,19(31):116-123.
顺北超深窄间隙固井技术应用
Study and Application on Cementing Technology in Ultra-deep Wells with Narrow Annulus in Shunbei block
投稿时间:2018-11-19  修订日期:2019-07-23
DOI:
中文关键词:  顺北  窄间隙  密封评价  增韧水泥  固井工艺
英文关键词:Shunbei block  narrow annulus  seal performance test  toughening cement slurry  cementing technology
基金项目:国家科技重大专项“超深高温高压油气井固井关键技术”(2017ZX05005005-003)、国家重点实验室专项“页岩气井水泥环失效机理及控制技术研究”
                 
作者单位
杨广国 中国石化石油工程技术研究院
陆沛青 中国石化石油工程技术研究院
高元 中国石化石油工程技术研究院
王永洪 中国石化西北油田分公司
桑来玉 中国石化石油工程技术研究院
杜晓雨 中国石化石油工程技术研究院
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中文摘要:
      顺北区块超深窄间隙固井面临高温、井筒内压高交变以及高压盐水层等复杂工况,水泥环长效密封性难以保证。基于顺北12.7mm窄间隙固井工况,采用自主研制的窄间隙水泥环密封完整性评价装置,研究了水泥石密封失效机理,结果表明:加压养护的低弹性模量水泥石较常规水泥石具有更好的密封性能。在此基础上,通过优选弹性材料及配套外加剂,研制了增韧水泥浆体系,弹性模量可低至6.8GPa、抗压强度可达22.7MPa。进一步通过优化固井综合措施,形成了提高超深窄间隙井筒完整性的固井配套技术。基于该技术,现场应用1井次,固井质量优质,未发生水窜。研究成果对于超深井窄间隙固井具有重要借鉴意义,可有效推进顺北区块的长效、安全、高效开发。
英文摘要:
      Cementingin ultra-deep wells with narrow annulus in Shunbei blockfaces a series of complicated conditions, such as high temperature, high alternating wellbore pressures and high-pressured slat-water layers, thereforeit is difficult to guarantee the sealing performance of cement sheath. Based on the cementing conditions on 12.7 mm narrow annulus, the self-developed evaluation device on sealing performance of narrow cement sheathwas adopted and the seal failure mechanismwas studied. The results show that the cement set with low Young’s modulus under pressure maintenance curing has a better sealing performance than that of the conventional cement. Therefore, through the optimum selection of elastic materials and admixture, a toughening cement slurry was developed. The Young’s modulus of toughening cement set can be as low as6.8GPa, and the compressive strength can be 22.7MPa.Furthermore, by optimizing integrated cementing measures,a cementing technology to improve the well integrity with narrow-annulus in ultra-deep wellwas generated.Based on this technology, awell test was applied in the field, and the cementing quality was excellent, and no water channeling occurred.The research results have a siginificant reference for cementing in ultra-deep well with narrow annulus and can effectively promote the long-term, safe and efficient development of the Shunbei block.
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