西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (2): 95-102.DOI: 10.11885/j.issn.1674-5086.2022.07.04.03

• 石油与天然气工程 • 上一篇    下一篇

南缘超高压致密气藏应力敏感及钻井液污染研究

胡元伟1, 杨硕孔2, 仇鹏1, 刘煌2, 赵传凯1   

  1. 1. 中国石油新疆油田勘探开发研究院, 新疆 克拉玛依 830013;
    2. 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500
  • 收稿日期:2022-07-04 发布日期:2024-05-11
  • 通讯作者: 刘煌,E-mail:liuhuangswpu@sina.com
  • 作者简介:胡元伟,1984年生,男,汉族,湖北崇阳人,高级工程师,硕士,主要从事油气藏工程和数值模拟方面的研究工作。E-mail:hyw9981@126.com;杨硕孔,1998年生,男,汉族,山东济宁人,硕士,主要从事油气田开发方面的研究工作。E-mail:1808884741@qq.com;仇鹏,1984年生,男,汉族,宁夏中卫人,高级工程师,硕士,主要从事气藏评价、天然气开发及储气库建设等方面的科研工作。E-mail:qiupeng@petrochina.com.cn;刘煌,1986年生,男,汉族,湖南新化人,副研究员,博士,主要从事油气田开发研究工作。E-mail:liuhuangswpu@sina.com;赵传凯,1995年生,男,汉族,新疆克拉玛依人,工程师,硕士,主要从事气藏工程研究工作。E-mail:zhaock@petrochina.com.cn
  • 基金资助:
    四川省科技厅重点基金(2021YFQ0044)

A Study on Stress Sensitivity and Drilling Fluid Pollution in Ultra-high Pressure Tight Gas Reservoirs in the Southern Margin

HU Yuanwei1, YANG Shuokong2, QIU Peng1, LIU Huang2, ZHAO Chuankai1   

  1. 1. Exploration and Development Research Institute, Xinjiang Oilfield, PetroChina, Karamay, Xinjiang 830013, China;
    2. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2022-07-04 Published:2024-05-11

摘要: 储层低渗特征和钻井液污染是影响低渗气藏有效建产的主要因素。基于耐超高温高压实验系统和CT扫描技术研究了新疆油田南缘区块1个高温超高压致密气藏(158.6 cdu,146 MPa)渗透率应力敏感性以及钻井液污染特征。研究结果表明,1) 储层岩芯孔隙中90$%$以上为粒间孔,且少量粒间孔被方解石胶结物和沥青全充填-半充填;2) 在净应力110 MPa下,所考察的两块柱塞岩芯(0.001 9 mD,0.032 5 mD)的应力敏感渗透率降低率(相对于储层实际净应力下)分别为39.28$%$和16.04$%$,属于中等偏弱和弱敏感;3) 定性和定量表征了另外两柱塞块岩芯(0.004 2 mD,0.029 0 mD)在实际操作工况下钻井液侵入特征,发现钻井液均没有突破两块岩芯长度,侵入渗透率为0.029 0 mD岩芯的深度为3.86 cm,但引起的表皮系数达到6.54,表现为严重污染。研究成果对于掌握高温超高压气藏储层特征、钻井液污染认识以及后续储层保护措施建立提供了重要技术支持。

关键词: 高温超高压, 致密气藏, 应力敏感, 钻井液污染, CT扫描技术

Abstract: The low permeability characteristics and the contamination of drilling fluid are the main factors affecting the effective production of low permeability gas reservoirs. Based on the ultra-high temperature and high pressure resistance experimental system and CT scanning technology, the permeability stress sensitivity and drilling fluid pollution characteristics of a high temperature ultra high pressure tight gas reservoir (158.6 ℃ 146 MPa) in the southern margin of Xinjiang Oilfield were studied. The research results show that: 1) more than 90$\%$ pores in the reservoir cores are intergranular pores, and a small amount of intergranular pores are fully or half-filled by calcite cement and asphalt; 2) under the net stress of 110 MPa, the stress-sensitive permeability reduction ratio (relative to the net stress of the initial reservoir) of the two plug cores (0.001 9 mD, 0.032 5 mD) were equal to 39.28$\%$ and 16.04$\%$, respectively, which are moderately weak and weak sensitive, respectively; 3) qualitatively and quantitatively characterizing the drilling fluid invasion characteristics of the other two plunger cores (0.004 2 mD, 0.029 mD) under actual operating conditions, it was found that the drilling fluid did not break through the length of the two cores. It was tested that the drilling fluid invasion length in the 0.029 mD core was 3.86 cm, but the skin coefficient caused by it reached 6.54, which belonged to serious pollution degree. The research results provide important technical support for mastering the characteristics of high temperature and ultra-high pressure gas reservoirs, understanding of drilling fluid pollution, and for establishing subsequent reservoir protection measures.

Key words: high temperature and ultra-high pressure, tight gas reservoirs, stress sensitivity, drilling fluid contamination, CT scanning technology

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