考虑硫沉积的气井流入动态曲线特征

郭珍珍, 李治平, 赖枫鹏, 孟雅, 李洪, 张荻萩

doi:10.11764/j.issn.1672-1926.2014.12.2065

天然气地球科学 >

2014 , Vol. 25 >Issue 12: 2065 - 2071

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.12.2065

天然气开发

考虑硫沉积的气井流入动态曲线特征

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中国地质大学（北京)能源学院，非常规天然气能源地质评价与开发工程北京市重点实验室，北京 100083

郭珍珍(1991-)，女，天津人，硕士研究生，主要从事气田、凝析气田开发研究.E-mail:guozzcugb@163.com.

收稿日期: 2014-04-03

修回日期: 2014-06-25

网络出版日期: 2019-09-18

基金资助

国家科技重大专项专题“新一代油藏数值模拟软件”（编号：2011ZX05009-006）；国家科技重大专项专题“碎屑岩储层水平井压裂产能预测及压裂效果评价数据支持系统研究”（编号：2011ZX05002-005-008HZ）联合资助.

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Characteristics of Gas Well Inflow Performance with Sulfur Deposition

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(Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering, School of Energy and Resource,China University of Geosciences (Beijing),Beijing 100083,China)

Received date: 2014-04-03

Revised date: 2014-06-25

Online published: 2019-09-18

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摘要

含硫气井在生产过程中，硫元素的沉积将降低储层孔隙度和渗透率，极大地破坏气井产能，此时常规气井产能计算模型已经不再适用。考虑硫元素在近井地带沉积引起的储层渗透率变化，将储层分为沉积区和非沉积区。基于渗流力学理论，建立了含硫气藏直井、直井压裂井在平面径向非达西稳定渗流条件下的二次三项式产能方程。通过分析硫沉积、启动压力梯度、裂缝长度、裂缝宽度对气井流入动态的影响，认为气井产能随硫沉积饱和度的增大而减小，但增长速度逐渐减小。气井无阻流量与启动压力梯度呈负相关关系。压裂措施能增大含硫气井产能，当气井产能受硫沉积影响较大时，可采取压裂的办法增产，必要时可用酸化压裂工艺，并对裂缝长度设计进行优选。

关键词： 硫沉积; 产能方程; 流入动态; 压裂井

本文引用格式

郭珍珍, 李治平, 赖枫鹏, 孟雅, 李洪, 张荻萩 . 考虑硫沉积的气井流入动态曲线特征[J]. 天然气地球科学, 2014 , 25(12) : 2065 -2071 . DOI: 10.11764/j.issn.1672-1926.2014.12.2065

Abstract

During the course of production in sour gas wells,deposition of elemental sulfur will reduce the porosity and permeability,and greatly depress the productivity of gas wells.The conventional deliverability calculation model is no longer applicable.Considering the change of reservoir permeability in the near wellbore zone caused by elemental sulfur deposition,the reservoir was divided into deposition region and non deposition region.Based on the theory of fluid mechanics,vertical and fracturing wells quadratic-trinomial productivity equations were established under the condition of radial steady non-Darcy seepage in sour gas reservoir.According to the analyses of the influence of sulfur deposition,the starting pressure gradient,fracture length,fracture width on gas well inflow performance,the result shows that the gas well productivity decreases with the increase of sulfur saturation,but the growth rate gradually decreases.Gas well open flow capacity is negatively correlated with the starting pressure gradient.Fracturing measures can increase the sulfurous gas well production capacity.Taking the way of hydraulic fracturing,when the gas well productivity is greatly influenced by the sulfur deposition,acid fracturing process can be carried out when it is necessary,and the design of crack length should be optimized.

Key words： Sulfur deposition; Productivity equation; Inflow performance; Fracturing well

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