石油工程

碳酸盐岩储集层钻井井涌特征及井涌风险评价

  • 郭艳利 ,
  • 孙宝江 ,
  • 高永海 ,
  • 李昊 ,
  • 武长富
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  • 1. 中国石油大学(华东)石油工程学院,山东青岛 266580;
    2. 中海油能源发展股份有限公司工程技术深圳分公司,广东深圳 518000
郭艳利(1988-),男,山东济阳人,中国石油大学(华东)石油工程学院在读博士研究生,主要从事海上油气钻采与集输、油气井流体力学与工程等方面的研究工作。地址:山东省青岛市黄岛区长江西路66号,中国石油大学石油工程学院,邮政编码:266580。E-mail:guoynli@126.com

收稿日期: 2016-06-25

  修回日期: 2017-03-13

  网络出版日期: 2017-05-26

基金资助

国家重点基础研究发展计划(973)项目(2015CB251200); 国家科技重大专项(2016ZX05020-006); 长江学者和创新团队发展计划(IRT_14R58)

Gas kick during carbonate reservoirs drilling and its risk assessment

  • GUO Yanli ,
  • SUN Baojiang ,
  • GAO Yonghai ,
  • LI Hao ,
  • WU Changfu
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  • 1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;
    2. Engineering Technology Branch, CNOOC Energy Technology & Services Limited, Shenzhen 518000, China;

Received date: 2016-06-25

  Revised date: 2017-03-13

  Online published: 2017-05-26

摘要

以塔中顺南地区碳酸盐岩储集层为例,分析碳酸盐岩储集层钻井井涌特征,建立井涌风险定量评价方法,并进行算例分析。依据钻井地质资料,分析塔中顺南地区碳酸盐岩储集空间特点与气体侵入井筒机制,发现储集层裂缝及孔洞发育,气体主要以压差与气液置换方式侵入井筒。综合考虑气体侵入井筒机制、气体在井筒中运移规律和井筒温度-压力场,并引入井筒气相体积分数密度函数,建立了井涌风险定量评价方法和井控风险分级方法。算例分析结果表明:可采用施加井口回压法判定井底气体侵入方式;碳酸盐岩储集层孔缝洞发育特征和酸性气体对井筒气相体积分数影响较大,易引发难监测、高强度井涌;井深、井径、钻井液密度、钻井液排量、钻井液黏度和钻速对井涌风险的影响依次减弱。图8表2参30

本文引用格式

郭艳利 , 孙宝江 , 高永海 , 李昊 , 武长富 . 碳酸盐岩储集层钻井井涌特征及井涌风险评价[J]. 石油勘探与开发, 2017 , 44(3) : 437 -444 . DOI: 10.11698/PED.2017.03.14

Abstract

The gas kick characteristics during carbonate reservoir drilling were analyzed taking carbonate reservoirs in Shunnan area of Tazhong as an example, a quantitative evaluation method for gas kick risk was established, and then a case was simulated. Looking into reservoir space characteristics and gas invasion mechanisms of carbonate reservoirs in Shunnan area based on drilling geologic data, it is found that the reservoirs are rich in fractures, pores and caves, and the gas invades into wellbore through gas-liquid replacement and differential pressure. By fully considering the gas invasion mechanism, gas migration law and wellbore temperature-pressure field, and introducing the gas volume fraction density function, a quantitative evaluation method for gas kick risk and a method for ranking well control risk were established. The case study shows that the wellhead back pressure method can be used to tell the mode of gas invasion; pore-fracture-cave and acid gas characteristics in carbonate reservoirs have stronger effect on the gas volume fraction in wellbore, and may cause hidden and severe gas kick; the effects of well depth, well diameter, drilling fluid density, drilling fluid displacement, drilling fluid viscosity and drilling rate on gas kick risks weaken in that order.

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