窄安全密度窗口重力置换漏喷函数研究

doi:10.11885/j.issn.1674-5086.2020.10.31.01

西南石油大学学报(自然科学版) ›› 2021, Vol. 43 ›› Issue (6): 201-208.DOI: 10.11885/j.issn.1674-5086.2020.10.31.01

窄安全密度窗口重力置换漏喷函数研究

王存新^1,2, 许佳欣², 李勇¹, 李皋², 肖东²

1. 中国石化西南石油工程有限公司钻井工程研究院, 四川德阳 618000;
2. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500

收稿日期:2020-10-31 发布日期:2022-01-08
通讯作者: 肖东,E-mail:swpuxiaodong@126.com
作者简介:王存新,1975年生,男,汉族,山东惠民人,高级工程师,博士,主要从事控压钻井及技术服务工作。E-mail:wangcunxin@126.com;许佳欣,1996年生,男,汉族,四川乐山人,硕士研究生,主要从事油气井建井安全工程等方面的研究工作。E-mail:2019-21000611@stu.swpu.edu.cn;李勇,1980年生,男,汉族,四川达州人,高级工程师,主要从事控压钻井及技术服务工作。E-mail:liy_1016@126.com;李皋,1976年生,男,汉族,四川武胜人,研究员,博士,主要从事气体钻井、欠平衡钻井、控压钻井、复杂油气藏储层保护及非常规油气资源勘探开发相关基础理论及应用技术研究。E-mail:lgmichael@263.net;肖东,1981年生,男,汉族,四川德阳人,副教授,博士,主要从事井筒复杂多相流理论与油气井井筒安全与控制技术研究。E-mail:swpuxiaodong@126.com
基金资助:
国家重大科技专项（2011ZX05023–0060，2011ZX05024–002）

The Leakage Function of Gravity Displacement in the Narrow Safety Density Window

WANG Cunxin^1,2, XU Jiaxin², LI Yong¹, LI Gao², XIAO Dong²

1. Research Institute of Drilling Engineering, Southwest Petroleum Engineering Co. Ltd., SINOPEC, Deyang, Sichuan 618000, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2020-10-31 Published:2022-01-08

摘要/Abstract

摘要： 由于重力置换的原因，钻遇裂缝性地层时，井下经常发生漏喷同存，造成井下复杂情况，增大井控难度，损害地层，影响生产。建立了重力置换数学模型，并基于此形成了高压含气层窄安全密度窗口重力置换漏喷函数，利用地层-井筒耦合流动可视化实验装置对漏喷函数进行了验证。实验结果表明，建立的漏喷函数的计算结果与实验数据吻合度较高。当钻遇裂缝性地层时，无论是采用欠平衡钻井、平衡钻井工艺，还是过平衡钻井工艺，均无法避免重力置换现象的发生，但是将井筒压力维持在近平衡（微过）状态，能够显著降低重力置换现象的严重程度。研究成果对研究钻遇裂缝性地层时的井底复杂的物质交换规律及井筒压力的安全控制具有重要的指导意义。

关键词: 裂缝性地层, 重力置换, 室内实验, 数学模型, 漏喷函数

Abstract: Due to gravity displacement, overflow and lost circulation occur simultaneously in fractured formations. This not only causes complicated downhole conditions and increases the difficulty of drilling pressure control, but also damage the reservoir, which will cause adverse effect on production. This paper establishes a gravity displacement model. And based on gravity displacement model, a leakage function of the gravity displacement in the narrow safety density window of high pressure gas layer has been formed. Then an experiment has been designed to testify leakage function by using the test device development of wellbore-formation coupling flow. The experimental results show that the calculated results of the leakage function are consistent with the experimental data. When drilling in fracture development formation, whether it is underbalanced drilling, balanced drilling, or overbalanced drilling, gravity displacement can't be avoided. However, when we maintain the wellbore pressure close to equilibrium (slightly exceeding), the gravity displacement phenomenon can be significantly reduced. Results of this study have important guiding significance for the mechanism of complex material exchange laws and wellbore safety control of the bottom hole when encountering fractured formations during drilling operations.

Key words: fractured formation, gravity displacement, laboratory test, mathematical model, leakage function

中图分类号:

TE28

王存新, 许佳欣, 李勇, 李皋, 肖东. 窄安全密度窗口重力置换漏喷函数研究[J]. 西南石油大学学报(自然科学版), 2021, 43(6): 201-208.

WANG Cunxin, XU Jiaxin, LI Yong, LI Gao, XIAO Dong. The Leakage Function of Gravity Displacement in the Narrow Safety Density Window[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 201-208.

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窄安全密度窗口重力置换漏喷函数研究

The Leakage Function of Gravity Displacement in the Narrow Safety Density Window

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