北特鲁瓦地区裂缝性碳酸盐岩地层井壁稳定性研究

doi:10.3969/j.issn.1006-6535.2021.01.024

特种油气藏 ›› 2021, Vol. 28 ›› Issue (1): 161-169.DOI: 10.3969/j.issn.1006-6535.2021.01.024

北特鲁瓦地区裂缝性碳酸盐岩地层井壁稳定性研究

张艳娜¹, 韩正波^2,3, 孔璐琳¹, 陈强⁴, 刘厚彬^2,3

1.中国石油勘探开发研究院,北京 100083;
2.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500;
3.西南石油大学,四川成都 610500;
4.中国石油西部钻探国际工程公司,新疆乌鲁木齐 830000

收稿日期:2020-03-26 修回日期:2020-10-27 出版日期:2021-02-25 发布日期:2021-04-27
通讯作者: 韩正波(1993—),男,2018年毕业于兰州城市学院石油工程专业,现为西南石油大学油气井工程专业在读硕士研究生,从事岩石力学与井壁稳定方面的研究工作。
作者简介:张艳娜(1982—),女,工程师,2006年毕业于长江大学油田化学专业,2012年毕业于中国石油勘探开发研究院油气井工程专业,获博士学位,现从事钻完井液技术研究工作。
基金资助:
国家科技重大专项“中亚和中东地区复杂碳酸盐岩油气藏采油采气关键技术研究与应用”(2017ZX0503-005)

Study on the Wellbore Stability in Fractured Carbonate Formations in North Truva Area

Zhang Yanna¹, Han Zhengbo^2,3, Kong Lulin¹, Chen Qiang⁴, Liu Houbin^2,3

1. Research Institute of Petroleum Exploration and Development,Beijing 100083,China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,Sichuan,China;
3. Southwest Petroleum University,Chengdu 610500,Sichuan,China;
4. CNPC Xibu Drilling Engineering Company Limited,Urumqi 830000,Xinjiang,China

Received:2020-03-26 Revised:2020-10-27 Online:2021-02-25 Published:2021-04-27

摘要/Abstract

摘要： 北特鲁瓦地区石炭系中统巴什基尔阶(KT-II)碳酸盐岩地层裂缝发育,钻井过程中井壁垮塌问题严重。为提高钻井效率,研究了KT-II碳酸盐岩地层裂缝产状及缝间充填物质,测试了碳酸盐岩基质及缝间充填物组分,分析了裂缝发育对碳酸盐岩地层孔渗特性、力学强度的影响。同时,耦合地应力场、渗流场及裂缝力学弱面效应等因素,建立了裂缝性碳酸盐岩地层井壁失稳理论模型,开展了北特鲁瓦地区KT-II碳酸盐岩地层井壁稳定性预测。结果表明:北特鲁瓦地区KT-II碳酸盐岩地层裂缝发育,裂缝间力学弱面效应突出,是诱发井壁垮塌的主导因素;裂缝发育加强了钻井液沿裂缝的渗流运移,弱化了钻井液对井壁的支撑作用;裂缝的产状、井眼轨迹对碳酸盐岩地层井壁稳定性影响明显,与裂缝面倾向夹角180°方向钻井井壁稳定性最好,优化井眼轨迹可有效提高裂缝性地层井壁稳定性。研究成果揭示了裂缝性碳酸盐岩地层井壁失稳机理与主要影响因素,为裂缝性碳酸盐岩地层井眼轨迹设计及工程参数优选提供借鉴。

关键词: 碳酸盐岩, 裂缝弱面, 坍塌机理, 井壁稳定, 北特鲁瓦地区

Abstract: The fracture development of carbonate formation in the Carboniferous Middle Bashkir Order (KT-II) in North Truva area has caused serious wellbore collapse during drilling.In order to improve the drilling efficiency,the fracture occurrence and inter-fracture filler of KT-II carbonate formation were studied,the carbonate matrix and inter-fracture filler components were tested,and the influence of fracture development on the pore permeability characteristics and mechanical strength of the carbonate formation was analyzed.At the same time,a theoretical model of wellbore instability in fractured carbonate formations was established by coupling the ground stress field,seepage field and fracture mechanical weak plane effect,and the prediction of wellbore stability in KT-II carbonate formations in North Truva area was carried out.The results show that:the development of fractures in the KT-II carbonate formation in the North Truva area and the prominent inter-fracture mechanical weak plane effect are the dominant factors inducing the wellbore collapse; the development of fractures strengthens the seepage migration of drilling fluid along the fractures and weakens the supporting effect of the drilling fluid on the wellbore; the fracture occurrence and wellbore trajectory have obvious effects on the stability of the wellbore in the carbonate formations,drilling in the direction of 180° to the dip angle of the fracture plane can bring the optimal wellbore stability,and optimizing the wellbore trajectory can effectively improve the wellbore stability in fractured formations.The results of the study reveal the mechanism and main influencing factors of the wellbore instability in fractured carbonate formations,and provide a reference for the design of wellbore trajectory and the selection of engineering parameters in fractured carbonate formations.

Key words: carbonate rock, fracture weak plane, collapse mechanism, wellbore stability, North Truva Area

中图分类号:

TE142

张艳娜, 韩正波, 孔璐琳, 陈强, 刘厚彬. 北特鲁瓦地区裂缝性碳酸盐岩地层井壁稳定性研究[J]. 特种油气藏, 2021, 28(1): 161-169.

Zhang Yanna, Han Zhengbo, Kong Lulin, Chen Qiang, Liu Houbin. Study on the Wellbore Stability in Fractured Carbonate Formations in North Truva Area[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 161-169.

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北特鲁瓦地区裂缝性碳酸盐岩地层井壁稳定性研究

Study on the Wellbore Stability in Fractured Carbonate Formations in North Truva Area

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