致密气藏气水两相压裂水平井产能计算方法

doi:10.3969/j.issn.1673-8926.2017.04.019

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 154–161.doi: 10.3969/j.issn.1673-8926.2017.04.019

致密气藏气水两相压裂水平井产能计算方法

何吉祥¹, 姜瑞忠¹, 毛瑜², 袁淋³

1. 中国石油大学 (华东)石油工程学院, 山东青岛 266580;
2. 中国石油华北油田分公司勘探开发研究院, 河北任丘 062552;
3. 中国石化西南油气分公司川东北采气厂, 四川阆中 637042

收稿日期:2017-01-23 修回日期:2017-03-15 出版日期:2017-07-21 发布日期:2017-07-21
第一作者:何吉祥(1986-),男,中国石油大学(华东)在读博士研究生,研究方向为气井试井、不稳态产量递减分析方法研究。地址:(266580)山东省青岛市黄岛区长江西路66号中国石油大学(华东)石油工程学院。Email:372366931@qq.com。
基金资助:
国家自然科学基金项目“页岩气藏多级压裂水平井流动特征及产能评价方法研究”（编号：51374227）资助

Productivity calculation method for gas-water two phase fractured horizontal wells in tight gas reservoir

HE Jixiang¹, JIANG Ruizhong¹, MAO Yu², YUAN Lin³

1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
2. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
3. Northeastern Sichuan Gas Production Plant, Sinopec Southwest Oil and Gas Company, Langzhong 637402, Sichuan, China

Received:2017-01-23 Revised:2017-03-15 Online:2017-07-21 Published:2017-07-21

摘要/Abstract

摘要： 致密气是目前较具潜力的非常规天然气资源之一，但受其储层低孔、低渗特征，气井产水以及气井调产的影响，以常规不稳定渗流理论以及传统达西渗流规律预测气井产量不再适用。基于致密气藏压裂水平井渗流特点，引入气水同产、储层与裂缝应力敏感效应、储层气体滑脱效应以及裂缝气体紊流效应，分别定义储层与裂缝中气水两相拟压力，建立了致密气藏气水两相稳态产能计算新方法。实例计算与产能影响因素分析表明：利用本文方法计算的无阻流量与产能测试无阻流量误差较小，证明了该方法具有较高的准确性；随着裂缝条数、裂缝半长的增大以及裂缝导流能力的增强，气井无阻流量增大；随着生产水气体积比、储层与裂缝应力敏感指数的增大，气井无阻流量减小；滑脱效应对气井产能影响较小，可忽略不计。该方法为致密气藏压裂水平井流入动态研究以及裂缝参数优化设计提供了理论依据。

关键词: 烃源岩, 油-源对比, 延长组, 旬邑探区, 鄂尔多斯盆地

Abstract: Tight gas is a potential of unconventional natural gas resources,while duo to the low porosity, low permeability, producing water and production adjusting, unsteady flow model and conventional Darcy law are no longer applicable to predict the production of gas wells. Based on the percolation mechanism of fractured horizontal wells in tight gas reservoir, considered the effects of stress sensitivity in reservoir and fractures, gas slippage and non-Darcy percolation caused by high velocity in fractures on productivity, the gas-water two phase generalized pseudo pressure in reservoir and fractures was defined respectively, and the gas-water two phase productivity calculation model for tight gas reservoir was built. Case study shows that the relative error of absolute open flow calculated by the new model is small compared with that calculated by productivity testing, which proves high accuracy and reliability of the new model. With the increase of fracture number, half-length and conductivity, the absolute open flow of gas well increases, while with the increase of water-gas volume ratio and stress sensitivity index in reservoir and fractures, the absolute open flow of gas well decreases, meanwhile gas slippage has little influence on gas well productivity,which can be neglected. The method could provide a theoretical basis for studying inflow performance relationship(IPR)of fractured horizontal wells and optimizing the fracture parameters in tight gas reservoir.

Key words: hydrocarbon source rock, oil source correlation, Yanchang Formation, Xunyi exploration area, Ordos Basin

中图分类号:

TE34

何吉祥, 姜瑞忠, 毛瑜, 袁淋. 致密气藏气水两相压裂水平井产能计算方法[J]. 岩性油气藏, 2017, 29(4): 154–161.

HE Jixiang, JIANG Ruizhong, MAO Yu, YUAN Lin. Productivity calculation method for gas-water two phase fractured horizontal wells in tight gas reservoir[J]. Lithologic Reservoirs, 2017, 29(4): 154–161.

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致密气藏气水两相压裂水平井产能计算方法

Productivity calculation method for gas-water two phase fractured horizontal wells in tight gas reservoir

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