产量不稳定分析在元坝气田的应用

doi:10.13809/j.cnki.cn32-1825/te.2021.04.023

摘要/Abstract

摘要：

元坝气田长兴组生物礁气藏为超深、高含硫、底水气藏,且处于稳产初期。动态监测表明气藏开发水侵风险较大,给气藏动态分析工作带了极大的挑战。结合元坝气田实际地质特征及生产现状,充分利用日常产量和压力数据,开展产量不稳定分析方法（Agarwal-Gardner、Blasingame、NPI等）应用分析。结果表明：可应用产量不稳定分析方法开展元坝长兴组气藏储层动态参数、气井动态产能、动态储量以及水侵识别等分析工作,所获得的结果可靠性高,有助于深化认识气藏的储层地质特征,解决生产中的难题,从而进一步指导气藏动态分析研究。

关键词: 生物礁底水气藏, 产量不稳定分析, Blasingame曲线, 动态分析, 元坝气田

Abstract:

The reef gas reservoir of Changxing Formation in Yuanba Gas Field is an ultra-deep gas reservoir with bottom water and high sulfur content, and it is in the early stage of stable production. The dynamic monitoring shows that the risk of water invasion in the development of gas reservoir is high, which brings great challenges to the dynamic analysis of gas reservoir. Combined with the actual geological characteristics and production status of Yuanba Gas Field, the daily production and pressure data are fully used to carry out the application analysis of the yield instability analysis method （Agarwal Gardner, Blasingame, NPI, etc.）. The results show that this method can be applied to analyze the reservoir dynamic parameters, gas well dynamic productivity, dynamic reserves and water invasion identification of the gas reservoir in Changxing Formation Yuanba Gas Field. The obtained results are highly reliable, which is helpful to deepen the understanding of the geological characteristics of gas reservoirs, solve the production problems, and further guide the dynamic analysis of gas reservoirs.

Key words: rate-transient analysis, yield instability analysis, Blasingame curve, dynamic analysis, Yuanba Gas Field

中图分类号:

TE344

荀威,王本成,杨丽娟等. 产量不稳定分析在元坝气田的应用[J]. 油气藏评价与开发, 2021, 11(4): 652-658.

Wei XUN,Bencheng WANG,Lijuan YANG, et al. Application of rate-transient analysis in Yuanba Gas Field[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 652-658.

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测试日期	解释模型	地层压力（MPa）		地层系数（10^-3 μm²·m）	有效渗透率（10^-3 μm²）	表皮系数	垂向渗透率比水平渗透率	井筒储存（m³/MPa）	复合半径（m）	两区流度比
测试日期	解释模型	压力计	产层中部	地层系数（10^-3 μm²·m）	有效渗透率（10^-3 μm²）	表皮系数	垂向渗透率比水平渗透率	井筒储存（m³/MPa）	复合半径（m）	两区流度比
2017年7月	变井储+表皮+ 水平井+径向复合		55.05	69.1	1.15	-6.49	0.31	2.77	201	4.47
2018年9月	水平井+径向复合	49.83	50.47	69.9	1.16	-6.54	0.61	2.72	191	1.34
2020年2月	水平井+径向复合	46.31	46.89	78.5	1.31	-6.79	0.58	2.55	212	1.5

分析方法	测试日期	解释模型	地层压力（MPa）	地层系数（10^-3 μm²·m）	有效渗透率（10^-3 μm²）	表皮系数	垂向渗透率比水平渗透率（K_z/K_r）	动态储量（10⁸ m³）
不稳定产量分析	2020年3月	水平井+均质油藏+圆形边界	47.60	72.2	1.20	-2	0.568	27.9
试井分析	2020年2月	水平井+径向复合	46.89	78.5	1.31	-6.79	0.580