| 漏失量较大地层“戴帽”固井技术 |
| 投稿时间：2019-03-27 修订日期：2019-05-20 点此下载全文 |
| 引用本文：李砚智,张长茂,张 平.漏失量较大地层“戴帽”固井技术[J].钻探工程,2019,46(7):41-44,50.LI Yanzhi,ZHANG Changmao,ZHANG Ping. Top fill cementing technology for large loss formation[J]. Drilling Engineering, 2019,46(7):41-44,50. |
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| 中文摘要:对漏失量较大的岩溶地层进行“戴帽”固井时，由于打完水泥浆后注入替浆水的过程中及后期稳定液面变化很容易造成水泥浆被稀释，前者直接导致固井失败，后者又受很多因素的影响导致重叠管环空内没有水泥浆或者被稀释而形不成水泥塞。本文主要从钻杆下入位置以及注入替浆水的过程中和后期稳定液面变化这几个方面总结“戴帽”固井的关键，并结合工程实例提出了一些人为控制方法来提高固井的成功率。 |
| 中文关键词:漏失地层 “戴帽”固井 压力平衡 |
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| Top fill cementing technology for large loss formation |
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| Abstract:In the top fill cementing process in karst strata with large leakage, the cement slurry is easy to be diluted due to the displacement fluid or changes in the stable liquid level. If it happens during the injection of the displacement fluid, cementing will fail; and if it happens after the injection, the cement slurry may not rise to the annulus of the overlapping casing or be diluted without forming the cement plug due to many factors. This paper summarizes the key technology of the top fill cementing process in view of the setting location of the drill string, and changes in the stable liquid level during and after slurry water injection. Based on the field cases, some artificial control methods are proposed to improve the success rate of cementing. |
| keywords:loss formation top fill cementing pressure balance |
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