天然气地球科学

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高含水低渗致密砂岩气藏储量动用动态物理模拟

徐轩,胡勇,万玉金,徐依,田姗姗,甘忠海   

  1. 1.中国矿业大学(北京),北京 100083;2.中国石油勘探开发研究院廊坊分院,河北 廊坊 065007;
    3.中国石油新疆油田公司采油一厂地质所,新疆 克拉玛依 834000;
    4.中国石油天然气管道工程有限公司,河北 廊坊 065000;5.辽河油田市场管理部,辽宁 盘锦 124010
  • 收稿日期:2015-03-25 修回日期:2015-04-22 出版日期:2015-12-10 发布日期:2015-12-10
  • 作者简介:徐轩(1984-),男,湖北荆门人,工程师,博士,主要从事油气藏渗流机理与开发研究. E-mail:xuxuan69@petrochina.com.cn.
  • 基金资助:

    国家科技重大专项“致密砂岩气有效开发评价技术”(编号:2011ZX05013-002)资助.

Physical Simulation of Reserve Producing State in Water-bearing Tight Sandstone Gas Reservoir

XU Xuan,HU Yong,WAN Yu-jin, XU Yi,TIAN Shan-shan,GAN Zhong-hai   

  1. 1.China University of Mining and Technology,Beijing 100083,China;2.Langfang Branch,Research Institute of
    Exploration and Development,PetroChina,Langfang 065007,China;3.Institute of Geology,No.1 Oil Production Plant
    of Xinjiang Oilfield Company,Karamay  834000,China;4.China Petroleum Pipeline Engineering Corporation,
    Langfang 065000,China;5.Market Management Department of Liaohe Oilfield Company,Panjin 124010,China
  • Received:2015-03-25 Revised:2015-04-22 Online:2015-12-10 Published:2015-12-10

摘要:

气藏剩余压力分布能够直接反映其储量动用情况,采用长岩心多点测压实验装置,选择渗透率分布区间分别为(1.38~1.71)×10-3μm2,(0.41~0.73)×10-3μm2,(0.049~0.084)×10-3μm2的多块砂岩岩心组合形成长度超过50cm的3组长岩心,模拟含水砂岩气藏衰竭开采。实验过程中实时记录气藏边界至气井不同位置处压力剖面变化,研究含水气藏储量动用特征。研究表明:致密砂岩储层产气特征、压力剖面形态、压降过程、废弃时剩余压力分布均与渗透率较高的储层(Ⅰ类)差异显著,明显受渗透率和含水饱和度控制。含水相同(约35%),生产至废弃条件时,Ⅰ类储层的压力剖面整体几乎降为0,而致密砂岩、剩余压力仍维持在原始压力的50%以上,且压力梯度大,表明含水气藏,渗透率越低储量动用越困难,动用均衡性越差;考虑含水,随含水饱和度增加,Ⅰ类储层压力剖面形态及下降过程变化不大;渗透率更低的储层(Ⅱ类)尤其是致密储层(Ⅲ类),其压力剖面形态变化极为显著,含水较高时,压力难以向外波及,储量难以有效动用,且非均衡性极强。

关键词: 含水气藏, 致密砂岩, 长岩心实验装置, 剩余压力剖面, 储量动用

Abstract:

Using long core multipoint press measurement experimental facility,three-group long cores were connected by a number of sandstone cores which have permeability of (1.38-1.71)×10-3μm2,(0.41-0.73)×10-3μm2,(0.049-0.084)×10-3μm2,to simulate the process of depletion-drive in water-bearing sandstone reservoir.Pressure profile from reservoir boundary to gas well was measured and recorded during the experimentation to study the characteristics of reserve utilization.The study shows that,the gas production characteristics,pressure profile shape,pressure drop process,residual pressure distribution of tight sandstone gas reservoir are very different from those of convention gas reservoir,all of which were influenced by permeability and water saturation more obviously.For those with the same water saturation (about 35%),when the production is carried out  until abandonment pressure,the pressure profile of convention gas reservoir will drop to zero,while residual pressure of tight gas reservoir still maintains 50% of the initial,and has bigger pressure gradient.The results show that for water-bearing tight sandstone gas reservoir,the lower permeability,the more difficult and less equitability of reserves utilization.Considering water saturation,when water saturation increase,the pressure profile′s shape and drop process of convention reservoir show little change,but to low-permeability reservoir especially tight reservoir,the pressure profile shape changes remarkably,in high water saturation,pressure drop spread outward difficultly,less effective and equitability of reserve utilization.

Key words: Water-bearing gas reservoir, Tight sandstone, Long core experimental facility, Residual pressure, Reserves producing

中图分类号: 

  • TE312

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