油气藏评价与开发 >
2021 , Vol. 11 >Issue 2: 256 - 260
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2021.02.017
下扬子地区页岩气井失返性漏失堵漏技术研究——以WY-1HF井为例
收稿日期: 2020-09-30
网络出版日期: 2021-04-30
基金资助
“十三五”国家重大专项“海上复杂地层安全快速钻完井关键技术”(2016ZX05033004-002);中国石化科技部项目“尼日利亚、喀麦隆复杂地层钻井关键技术研究”(PE19009-1);中国地质调查局项目“合肥盆地及周缘油气资源战略调查”(DD20190725)
Plugging technology applied for total loss in shale gas wells of Lower Yangtze Region: Taking Well-WY-1HF as an example
Received date: 2020-09-30
Online published: 2021-04-30
目前,国内页岩气钻井发生漏失情况比较普遍,适用于油基钻井液的堵漏方法不多,失返性漏失仍是业内技术人员面临的难题。以WY-1HF井现场作业为例,使用油基钻井液在该井水平段钻井时发生失返性恶性漏失,且使用常规的桥塞堵漏技术、油井水泥堵漏技术均不能有效封堵漏失层。在对该井漏失层特征分析的基础上,研究了无机凝胶的堵漏机理及桥塞堵漏材料对油基钻井液性能的影响规律,最终采用高密度（1.89 g/cm3）的水泥固化封堵结合低密度（1.17 g/cm3）无机凝胶固化封堵,配合使用油基钻井液高浓度大颗粒桥塞堵漏浆,堵漏成功,保障了后续通井、测井、下套管、固井等作业的顺利开展。该方法的成功实施对该地区页岩气堵漏技术的应用具有一定的借鉴意义。
李大勇 , 肖超 , 王胜建 , 赵小祥 , 朱迪斯 , 刘浩亚 . 下扬子地区页岩气井失返性漏失堵漏技术研究——以WY-1HF井为例[J]. 油气藏评价与开发, 2021 , 11(2) : 256 -260 . DOI: 10.13809/j.cnki.cn32-1825/te.2021.02.017
At present, the leakage of shale gas drilling is quite common in China, and there are few plugging methods suitable for oil-based drilling fluid. The total loss of drilling fluid is still a difficult problem for technicians in the industry. Taking the field operation of Well-WY-1HF as an example, during the drilling of its horizontal well interval by using oil-based drilling fluid, the conventional plugging technology of bridge plug and cement plugging technology of oil well can not work efficiently. Based on the analysis of the characteristics of the loss zones, the effect of different plugging material of oil-base drilling fluid performance have been studied to determine the formula for successful plugging, that is high density （1.89 g/cm3） cement solidified plugging combined with low density （1.17 g/cm3） inorganic gel curing plugging, cooperating with the use of bridge plug with high concentration and large particle. It ensures the subsequent drifting, well logging, the casing and cementing operation smoothly. The successful implementation of this method provides certain reference for the application of shale gas plugging technology in the same area.
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