[1]张小龙,杨志兴.启动压力梯度对低渗气藏不稳定渗流特征的影响[J].油气井测试,2018,27(03):7-13.[doi:10.19680/j.cnki.1004-4388.2018.03.002]
　ZHANG Xiaolong,YANG Zhixing.Impacts of startup pressure gradient on features of transient seepage flowin lowpermeability gas reservoirs[J].Well Testing,2018,27(03):7-13.[doi:10.19680/j.cnki.1004-4388.2018.03.002]
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启动压力梯度对低渗气藏不稳定渗流特征的影响()
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《油气井测试》[ISSN:1006-6977/CN:12-1485/TE]

卷:
27
期数:
2018年03期
页码:
7-13
栏目:
出版日期:
2018-06-25

文章信息/Info

Title:
Impacts of startup pressure gradient on features of transient seepage flowin lowpermeability gas reservoirs
文章编号:
1004-4388(2018)03-0007-07
作者:
张小龙; 杨志兴
中海石油（中国）有限公司上海分公司研究院，上海，200335
Author(s):
ZHANG Xiaolong;  YANG Zhixing
Research Institute of CNOOC (China) Co., Ltd.Shanghai Branch, Shanghai 200335, China
关键词:
启动压力梯度; 低渗气藏; 非达西渗流; 不稳定渗流; 渗流模型; 压力动态分析
Keywords:
startup pressure gradient;  lowpermeability gas reservoir;  nonDarcy flow;  transient seepage flow;  seepage model;  pressure behavior analysis
分类号:
TE353
DOI:
10.19680/j.cnki.1004-4388.2018.03.002
文献标志码:
A
摘要:
为了准确描述启动压力梯度对低渗气藏不稳定渗流特征的影响，在广义达西定律基础上，通过考虑启动压力梯度的非达西渗流特征，分别建立了无限大、圆形封闭及圆形定压外边界低渗气藏的不稳定渗流数学模型。采用格林函数法获得各渗流模型的拉普拉斯空间解析解，利用Stehfest数值反演算法，将拉普拉斯空间解反演变换得到实空间解，通过实例绘制了不同启动压力梯度下的无限大低渗气藏井底压力与时间的双对数曲线。研究发现，气井定产量生产时，当启动压力梯度分别为0、0001MPa/m、0003MPa/m及0005MPa/m，生产97h后，井底压力分别下降166%、196%、263%、334%，表明启动压力梯度越大，对井底压力影响越显著，井底压力下降越快，地层能量衰竭越严重，低渗储层动用越困难，单井有效动用范围越有限。该特征分析对加深启动压力梯度对低渗气藏不稳定渗流机理的研究与认识有一定的借鉴。
Abstract:
 To accurately reflect the impacts of startup pressure gradient on features of transient seepage flow in lowpermeability gas reservoirs, the mathematical models for transient seepage flows in lowpermeability gas reservoirs with infinite, circularly enclosed and circular constantpressure outer boundaries were built on the basis of general Darcy’s law, and with consideration to nonDarcy flow features of startup pressure gradient. By using the Green’s function, the Laplace spatial solutions of these models were derived. Then, with the Stehfest numerical inversion algorithm, the Laplace spatial solutions were inverted to derive the analytical solutions in real space. Finally, the loglog curve of bottomhole pressure and time for infinite lowpermeability gas reservoirs with different startup pressure gradients were generated for certain examples. As revealed by the research results, when the gas well with startup pressure gradient of 0, 0001 MPa/m, 0003 MPa/m and 0005 MPa/m produces at a single rate for 97 h, the bottomhole pressure reduces by 166%, 196%, 263% and 334%, respectively. Obviously, the higher the startup pressure gradient is, the more significant the impacts on bottomhole pressure are, the faster the bottomhole pressure drops, the more severely the formation energy depletes, the more difficult the development of lowpermeability reservoirs is, and the more limited the effective well drainage area is. The study results can provide necessary references for deeply identifying the impacts of startup pressure gradient on transient seepage flow in lowpermeability gas reservoirs.

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备注/Memo

备注/Memo:
2018-01-02收稿，2018-03-29修回，2018-04-14接受，2018-06-15网络版发表
国家重大专项 “东海厚层非均质性大型气田有效开发关键技术”
张小龙，男，1985年出生，硕士，2012年毕业于西南石油大学，目前主要从事油气田开发工程方面生产科研工作。电话：15601769062；Email：zhangxl30@cnooc.com.cn。地址：上海市长宁区通协路388号中海油大厦，邮政编码：200335。
更新日期/Last Update: 2018-08-09