石油勘探与开发 >

2018 , Vol. 45 >Issue 1: 119 - 127

DOI: https://doi.org/10.11698/PED.2018.01.12

油气田开发

页岩高压等温吸附曲线及气井生产动态特征实验

  • 端祥刚 ,
  • 胡志明 ,
  • 高树生 ,
  • 沈瑞 ,
  • 刘华勋 ,
  • 常进 ,
  • 王霖
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  • 1. 中国石油勘探开发研究院,河北廊坊 065007
    2. 中国科学院大学渗流流体力学研究所,河北廊坊 065007
端祥刚（1987-）,男,安徽宿州人,博士,中国石油勘探开发研究院工程师,主要从事非常规油气渗流研究工作。地址：河北省廊坊市44号信箱,中国石油勘探开发研究院渗流流体力学研究所,邮政编码：065007。E-mail: duanxg69@petrochina.com.cn

收稿日期: 2017-07-05

  修回日期: 2017-12-23

  网络出版日期: 2018-01-16

基金资助

国家科技重大专项（2017ZX05037-001）; 国家“十三五”示范工程（2016ZX05062-002-001）

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Shale high pressure isothermal adsorption curve and the production dynamic experiments of gas well

  • DUAN Xianggang ,
  • HU Zhiming ,
  • GAO Shusheng ,
  • SHEN Rui ,
  • LIU Huaxun ,
  • CHANG Jin ,
  • WANG Lin
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  • 1. PetroChina Research Institute of Petroleum Exploration and Development, Langfang 065007, China
    2. Institute of Porous Flow & Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China;

Received date: 2017-07-05

  Revised date: 2017-12-23

  Online published: 2018-01-16

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摘要

选取四川盆地长宁—威远地区龙马溪组页岩储集层样品,采用高压等温吸附仪开展高压等温吸附曲线测试,运用自主研发页岩气流固耦合实验系统开展了单岩心对比和多岩心串联气井衰竭开发物理模拟实验;在总结吸附、解吸规律基础上,建立了高压等温吸附模型,修正了含气量计算方法,明确吸附气动用规律。研究表明,页岩高压条件下的等温吸附规律与常规低压下吸附规律不同,高压等温吸附曲线随压力变化存在最大过剩吸附量,对应压力为临界解吸压力。高压等温吸附曲线可用于评价页岩吸附气量及吸附气动用程度;高压等温吸附模型能够拟合和表征页岩高压等温吸附规律;修正后的含气量计算方法,可以更客观评估含气量与吸附气比例,是储量评估和产量递减分析的理论基础;吸附气动用程度与压力密切相关,储集层压力低于临界解吸压力,吸附气才能有效动用;气井生产过程中,近井地带压力下降幅度大,吸附气动用程度高,远离井筒,吸附气动用程度低或不动用。图14表2参25

关键词： 页岩; 高压等温吸附; 过剩吸附量; 临界解吸压力; 页岩气; 吸附曲线

本文引用格式

端祥刚 , 胡志明 , 高树生 , 沈瑞 , 刘华勋 , 常进 , 王霖 . 页岩高压等温吸附曲线及气井生产动态特征实验[J]. 石油勘探与开发, 2018 , 45(1) : 119 -127 . DOI: 10.11698/PED.2018.01.12

Abstract

The high pressure static adsorption curves of shale samples from Silurian Changning-Weiyuan Longmaxi Formation were tested by using high pressure isothermal adsorption equipment. The physical modeling of depletion production was tested on single cores and multi-core series by using self-developed shale gas flow solid coupling experiment system. The adsorption and desorption laws were summarized and a high pressure isothermal adsorption model was established. The calculation formula of gas content was corrected, and the producing law of adsorption gas was determined. The study results show that the isothermal adsorption law of the shale reservoir under high pressure was different from the conventional low pressure. The high pressure isothermal adsorption curve had the maximum value in excess adsorption with pressure change, and the corresponding pressure was the critical desorption pressure. The high pressure isothermal curve can be used to evaluate the amount of adsorbed gas and the producing degree of adsorption gas. The high pressure isothermal adsorption model can fit and characterize the high pressure isothermal adsorption law of shale. The modified gas content calculation method can evaluate the gas content and the proportion of adsorbed gas more objectively, and is the theoretical basis of reserve assessment and production decline analysis. The producing degree of adsorption gas is closely related to the pressure, only when the reservoir pressure is lower than the critical desorption pressure, the adsorption gas can be produced effectively. In the process of gas well production, the pressure drop in the near-well area is large, the producing degree of adsorption gas is high, the adsorption gas is low in producing degree, or not produced at all, away from the wellbore.

Key words： shale; high pressure isothermal adsorption; excess adsorption; critical desorption pressure; shale gas; adsorption curve

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