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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第9期    总第241期    2014年9月

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文章编号:1672-7207(2014)09-3283-05
裂缝性气藏水侵机理物理模拟
沈伟军1, 2,李熙喆3,刘晓华3,陆家亮3,焦春艳3

(1. 中国科学院渗流流体力学研究所,河北 廊坊,065007;
2. 中国科学院大学,北京,100190;
3. 中国石油勘探开发研究院廊坊分院,河北 廊坊,065007
)

摘 要: 为研究裂缝性气藏水侵动态规律及其影响因素,并为此类气藏开发方案设计提供科学依据,通过设计3种不同全直径长岩心组合模型,建立裂缝性气藏水侵动态物理模拟实验系统,对3种不同模型在不同底水、配产、压力条件下进行物理模拟,分析不同模型在不同底水、配产、压力条件下的水侵机理。研究结果认为:底水锥进速度受裂缝渗透率影响,渗透率越大,底水侵入速度越快,气藏最终采收率降低;底水对裂缝性气藏影响很大,但底水大小超过一定程度,对气井生产变化幅度不大;在裂缝性底水气藏中,气藏压力越大,底水锥进速度越快,从而对应水气体积比越高,最终采收率越低;底水锥进速度受单井配产的影响,单井配产增加,底水锥进速度加强,气藏采收率降低但变化幅度不大。

 

关键词: 裂缝性气藏;物理模拟;水侵;水气体积比;采收率

Physical simulation of water influx mechanism in fractured gas reservoirs
SHEN Weijun1, 2, LI Xizhe3, LIU Xiaohua3, LU Jialiang3, JIAO Chunyan3

1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Science, Langfang 065007, China;
2. University of Chinese Academy of Science, Beijing 100190, China;
3. PetroChina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, China

Abstract:To study the water invasion performance and the influencing factors in the fractured gas reservoirs and provide a scientific basis for the design of development plan of the gas reservoirs, three kinds of full diameter long-core combination models were designed and an experimental system of the water invasion performance in fractured gas reservoirs was established. Three different models were employed in the physical simulation of the different bottom waters, productions and pressures in gas reservoirs, and their water invasion mechanisms in different conditions were analyzed. The results show that the size of fracture permeability influences water coning rate. The bigger permeability is, the greater water coning rate would be. Thus, it can reduce gas ultimate recovery. Bottom-water has a great effect upon fractured gas reservoirs, but gas well has little change if bottom-water size exceeded a certain extent. The higher gas pressure in fractured bottom-water gas reservoirs is, the greater coning rate would be. Thus, the higher the water-gas rate is, the lower gas ultimate recovery would be. Single well production influences water coning rate. With the increase of the single well production, water coning rate strengthens, then gas recovery decreases but there is little change.

 

Key words: fractured gas reservoirs; physical simulation; water influx; volume rate of water and gas water-gas; gas recovery factor

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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