表面活性剂提高页岩气井固井水泥浆抗污染性能研究
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1.中国石油集团渤海钻探工程有限公司第二固井分公司;2.中国石油集团东方地球物理勘探有限责任公司海洋物探分公司

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渤海钻探工程有限公司重大工艺专项“泸州、渝西深层页岩气水平井安全优快钻完井及配套技术研究”(2021ZD18Y-01)。


Study on improving anti-pollution performance of shale gas well cementing cement slurry with surfactant
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    摘要:

    页岩气储层采取水平井开发时由于套管偏心以及井径不规则等原因,通常会导致油基钻井液的顶替效率较低,不可避免的会有部分油基钻井液掺入到固井水泥浆中,对水泥浆的性能造成污染。因此,为了提高页岩气固井水泥浆的抗污染能力,室内以现场油基钻井液和固井水泥浆为研究对象,开展了表面活性剂AFSG-1提高页岩气井固井水泥浆抗污染性能的研究。结果表明:现场油基钻井液的掺入会严重影响固井水泥浆的流动度、稠化时间以及混浆水泥石性能,油基钻井液的掺入比例越大,污染越严重;随着固井水泥浆中表面活性剂AFSG-1加量的不断增大,水泥浆自身的抗污染能力逐渐增强,当固井水泥浆中表面活性剂AFSG-1的质量浓度达到2%时,再掺入20%的油基钻井液,混浆的流动度、稠化时间以及水泥石性能与未加表面活性剂时相比均有明显改善;另外,表面活性剂AFSG-1对固井水泥浆抗油基钻井液污染性能的改善效果明显优于其他常用表面活性剂。研究结果认为表面活性剂AFSG-1可以有效提高页岩气固井水泥浆抗油基钻井液污染的能力,能够提高固井质量,保障固井安全。

    Abstract:

    When shale gas reservoir is developed by horizontal wells, due to casing eccentricity and irregular well diameter, the displacement efficiency of oil-based drilling fluid is usually low. It is inevitable that some oil-based drilling fluid will be mixed into cementing cement slurry and pollute the performance of cement slurry. Therefore, in order to improve the anti-pollution ability of shale gas cementing cement slurry, the indoor research on improving the anti-pollution performance of shale gas well cementing cement slurry with surfactant AFSG-1 was carried out with on-site oil-based drilling fluid and cementing cement slurry as the research object. The results show that the addition of on-site oil-based drilling fluid will seriously affect the fluidity, thickening time and slurry water mud properties of cementing cement slurry. The greater the proportion of oil-based drilling fluid, the more serious the pollution is; With the increasing amount of surfactant AFSG-1 in the cementing cement slurry, the anti-pollution ability of the cement slurry is gradually enhanced. When the mass concentration of surfactant AFSG-1 in the cementing cement slurry reaches 2%, and then 20% oil-based drilling fluid is added, the fluidity, thickening time and cement stone properties of the slurry are significantly improved compared with those without surfactant. In addition, the effect of surfactant afsg-1 on improving the oil-based drilling fluid pollution resistance of cementing cement slurry is significantly better than that of other commonly used surfactants. The results show that surfactant AFSG-1 can effectively improve the anti oil-based drilling fluid pollution ability of shale gas cementing cement slurry, improve cementing quality and ensure cementing safety.

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  • 收稿日期: 2022-04-22
  • 最后修改日期: 2022-06-30
  • 录用日期: 2022-07-08
  • 在线发布日期: 2023-03-20
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