川中须家河组低渗有水气藏渗流特征及其影响因素

doi:10.11764/j.issn.1672-1926.2018.12.001

天然气地球科学

川中须家河组低渗有水气藏渗流特征及其影响因素

陈建勋¹，杨胜来¹，邹成¹，梅青燕²，周源²，孙丽婷¹

1.油气资源与探测国家重点实验室，中国石油大学(北京),北京 102249；
2.中国石油西南油气田分公司勘探开发研究院，四川成都 610041

收稿日期:2018-09-11 修回日期:2018-11-17 出版日期:2019-03-10
作者简介:陈建勋（1991-），男，山东潍坊人，在读博士，主要从事低渗致密气藏渗流特征研究.E-mail：chenjianxun1991@163.com.
基金资助:
中国石油科技重大专项“西南油气田天然气上产300亿立方米关键技术研究与应用”（编号：2016E-06）资助.

Flow characteristics and influencing factors of low permeability-hydrous gas reservoirs in Xujiahe Formation,central Sichuan Basin

Chen Jian-xun¹，Yang Sheng-lai¹，Zou Cheng¹，Mei Qing-yan²，Zhou Yuan²，Sun Li-ting¹

1.State Key Laboratory of Oil and Gas Resources and Exploration,China University of Petroleum (Beijing),Beijing 102249,China;
2.Exploration and Development Research Institute of PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China

Received:2018-09-11 Revised:2018-11-17 Online:2019-03-10

摘要/Abstract

摘要： 川中须家河组低渗有水气藏储层气水关系复杂、单井产能低、稳产困难，提高气藏产能面临技术挑战。针对以上问题，首先利用CT扫描分析储层微观孔隙结构特征，其次开展地层条件下孔隙型、裂缝型岩心的渗流特征实验，并对比分析束缚水、压力、温度等条件对不同类型岩心渗流特征的影响。研究发现，岩心基础渗透率与岩心类型、孔喉半径、孔隙连通性等密切相关；与常温低压条件下相比，地层条件下的气相流动的启动压力梯度、非达西流特征更为明显，气相流量、渗透率均大幅降低；束缚水、压力、温度等条件对气相流动的影响程度依次降低；裂缝型岩心比孔隙型岩心受束缚水和温度的影响程度更低，受压力的影响程度更高。该研究为掌握不同类型储层产能的影响因素及生产方案的调整提供了理论依据。

关键词: 低渗气藏, 岩心类型, 地层条件, 束缚水, 渗流特征

Abstract: The low permeability gas reservoirs in Xujiahe Formation in central Sichuan Basin are facing many problems such as the complex gas-water relationship,the low gas well productivity and the difficulty of stable production.It is necessary to study the flow characteristics under formation conditions.How to further increase production capacity is facing great challenges.In view of the above problems,firstly,the micro-pore structure characteristics of reservoir are analyzed by CT scanning;secondly,the flow characteristics of porous and fractured cores under formation conditions are experimented,and the effects of irreducible water,pressure and temperature on flow characteristics of different types of cores are compared and analyzed.It is found that the permeability of cores is closely related to the types of cores,pore throat radius,pore connectivity,etc.Compared with the normal temperature and low pressure conditions,the gas phase flow has obvious characteristics of starting pressure gradient and non-Darcy flow,and the gas flow and permeability are greatly reduced.The influence of irreducible water,pressure,temperature and other experimental conditions on core flow characteristics decreases in turn.The permeability of cores with residual water in formation condition is about 2.6% of the basic permeability.Compared with porous core,fractured core is less affected by bound water and temperature,and is more affected by pressure.This study provides a theoretical basis for analyzing the productivity influencing factors and adjusting production schemes of different types of reservoirs.

Key words: Low permeability gas reservoir, Types of cores, Formation condition, Irreducible water, Flow characteristics

中图分类号:

TE32+1

陈建勋, 杨胜来, 邹成, 梅青燕, 周源, 孙丽婷. 川中须家河组低渗有水气藏渗流特征及其影响因素[J]. 天然气地球科学, 2019, 30(3): 400–406.

Chen Jian-xun, Yang Sheng-lai, Zou Cheng, Mei Qing-yan, Zhou Yuan, Sun Li-ting. Flow characteristics and influencing factors of low permeability-hydrous gas reservoirs in Xujiahe Formation,central Sichuan Basin[J]. Natural Gas Geoscience, 2019, 30(3): 400–406.

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