[1]杜道勇,张晓红,王　委,等.盐城凹陷阜宁组地层井壁失稳原因及对策[J].复杂油气藏,2023,16(03):352-358.[doi:10.16181/j.cnki.fzyqc.2023.03.018]
　DU Daoyong,ZHANG Xiaohong,WANG Wei,et al.Causes and countermeasures of wellbore instability of the Funing Formationin Yancheng Sag[J].Complex Hydrocarbon Reservoirs,2023,16(03):352-358.[doi:10.16181/j.cnki.fzyqc.2023.03.018]
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盐城凹陷阜宁组地层井壁失稳原因及对策()
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《复杂油气藏》[ISSN:1674-4667/CN:31-2019/TQ]

卷:
16卷
期数:
2023年03期
页码:
352-358
栏目:
油气工程
出版日期:
2023-09-25

文章信息/Info

Title:
Causes and countermeasures of wellbore instability of the Funing Formationin Yancheng Sag
作者:
杜道勇1；张晓红1；王　委1；陈　军1；徐　浩2
1.中石化华东石油工程有限公司江苏钻井公司，江苏 扬州 225261；2.中国石化江苏油田分公司石油工程技术研究院，江苏 扬州，225009
Author(s):
DU Daoyong1; ZHANG Xiaohong1; WANG Wei1; CHEN Jun1; XU Hao2
1.Jiangsu Drilling Company of Huadong Petroleum Engineering Co. Ltd.，SINOPEC，Yangzhou 225261，China；2. Petroleum Engineering Technology Research Institute of Jiangsu Oilfield Company，SINOPEC，Yangzhou 225009，China
关键词:
泥页岩; 井壁失稳; 强封堵; KCl胺基; 盐城凹陷
Keywords:
mud shale; shaft wall instability; strong plugging; KCl amine group; Yancheng Sag
分类号:
TE258
DOI:
10.16181/j.cnki.fzyqc.2023.03.018
文献标志码:
A
摘要:
盐城凹陷阜宁组地层易垮塌、密度窗口窄，阜二段“七尖峰”、“四尖峰”以黑色硬脆性泥页岩为主，该地层特点为层理、微裂缝性发育，坍塌压力系数较大，井壁不稳定，易导致划眼、电测遇阻、井漏、井眼报废等井下复杂故障。对已钻井资料压力曲线、阜宁组地层岩样矿物组分和微观特征分析，探讨了阜宁组地层井壁失稳的原因。根据阜宁组地层压力系数、岩性特征等特点，提出了优化封堵材料的配比，有效封堵阜宁组地层微裂缝，确定合理的钻井液密度，有效控制钻井液及滤液进入该地层，保持硬脆性泥页岩的井壁稳定，降低复杂故障发生的技术措施。现场应用表明，钾胺基聚合物钻井液体系及配套措施抑制封堵性能强，稳定井壁性能好，与同区块其他施工井比较，井下复杂故障率低。该技术措施为同类井施工提供了成功经验。
Abstract:
The Funing Formation in Yancheng Sag is prone to collapse and has a narrow density window. The “Seven-apex” and “Four-apex” of the second member of the Funing Formation are dominated by black hard and brittle mud shale. The formation is characterized by the development of bedding and micro-fractures，large collapse pressure coefficient，and instability of the borehole wall，which easily leads to complicated downhole failures such as borehole scratching，electrical measurement obstruction，well leakage，and borehole abandonment. The pressure curve of the drilled well data，mineral composition，and microscopic characteristics of the rock samples of the Funing Formation was analyzed to explore the reasons for wellbore instability in the Funing Formation. According to the pressure coefficient，lithological characteristics，and other characteristics of the Funing Formation，some technical measures are proposed to optimize the ratio of plugging materials to effectively seal the micro-fractures in the Funing Formation，determine a reasonable density of drilling fluids，effectively control the entry of drilling fluids and filtrates into the formation，maintain the stability of the well wall in the hard and brittle mud shale，and reduce the occurrence of complex failures. Field application shows that the potassium amine-based polymer drilling fluid system and supporting measures have strong inhibition and sealing performance，good stabilization of the well wall，and a low rate of complex downhole failures compared with other wells constructed in the same block. This technical measure provides a successful experience for the construction of similar wells.

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备注/Memo

备注/Memo:
收稿日期：2023-07-05；改回日期：2023-08-01。
第一作者简介：杜道勇（1981—），高级工程师，主要从事钻井液技术研究和现场推广应用工作。E-mail :55227480@qq.com。
更新日期/Last Update: 1900-01-01