凝析气藏反凝析伤害评价方法及应用

油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (6): 30-34.

凝析气藏反凝析伤害评价方法及应用

邹春梅^1,²,汤勇³,晏军²,孙杰文²,李俞虹³,崔轶男³

^1. 中国地质大学（北京）能源学院,北京 100083
^2. 中国石油勘探开发研究院廊坊分院,河北廊坊 065007
^3. 西南石油大学石油与天然气工程学院,四川成都 610500

收稿日期:2019-07-01 发布日期:2019-12-30 出版日期:2019-12-26
作者简介:邹春梅（1983 —）,女,在读博士研究生,主要从事试井分析、气田开发方面研究工作。通讯地址：河北省廊坊市广阳区万庄石油基地,邮政编码：065007。E-mail： zouchunmei01@petrochina.com.cn
基金资助:
国家自然科学基金项目“考虑地层水蒸发的高温高压油气藏相态及渗流机理研究”(50604011)

The evaluation methods and application of retrograde condensation damage in condensate gas reservoir

ZOU Chunmei^1,²,TANG Yong³,YAN Jun²,SUN Jiewen²,LI Yuhong³,CUI Yinan³

^1. School of Energy Resources, China University of Geosciences（Beijing）, Beijing 100083, China
^2. Langfang Branch of Research Institute of Petroleum Exploration and Development, CNPC, Langfang, Hebei 065007, China
^3. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2019-07-01 Online:2019-12-30 Published:2019-12-26

摘要/Abstract

摘要：

针对凝析气藏单一的反凝析伤害评价方法可能导致反凝析认识与实际生产发生偏差的问题,建立了凝析气藏反凝析伤害定性和定量综合评价方法。首先采用反凝析相态评价和生产动态分析判断气井是否发生反凝析,然后综合气井产能、污染表皮系数、数值模拟和压力恢复试井等多种方法定量评价反凝析伤害程度和半径。以哈萨克斯坦让纳若尔凝析气藏169井为例进行了反凝析伤害定性定量评价。结果显示：气藏已经发生反凝析,反凝析对油产能影响大,对气产能影响小;伤害程度存在单井差异,总体上反凝析属于低伤害且低于16 %;污染半径在20 m左右。气层厚度大和碳酸盐岩储层缝洞发育是让纳若尔气藏反凝析对气井产能影响较小的重要原因,提供的方法对矿场凝析气藏反凝析评价具有重要参考意义。

关键词: 凝析气藏, 反凝析, 伤害半径, 相态, 让纳若尔

Abstract:

For the characteristics of condensate gas reservoirs, evaluation methods on just one side would lead to misjudgment on retrograde condensation of gas reservoir. Therefore, qualitative and quantitative comprehensive evaluation method of retrograde condensation damage was established. Firstly, the retrograde condensate phase evaluation and production dynamic analysis were used to judge whether the retrograde condensation of gas wells occurred or not. And then, methods such as the gas well productivity, pollution skin coefficient, numerical simulation and pressure build-up testing were comprehensively applied to quantitatively evaluate the degree and radius of the retrograde condensate damage. The established method was carried out in the case of the well-169 of Zanarol condensate gas reservoir in Kazakhstan. The results show that gas condensate has occurred in Zanarol condensate gas reservoir. Retrograde condensation has great influence on oil productivity, but a little on that of gas. And the damage degree is different for different gas wells. Generally, retrograde condensation damage was little and its influence rate was less than 16 %. Pollution radius was about 20 m. Thicker gas layer and carbonate reservoirs with developed fracture-vug were important reasons for less influence of retrograde condensation damage on gas well productivity in Zanarol. The established method can be used as a reference for the analysis of complex condensate gas reservoirs.

Key words: condensate gas reservoir, retrograde condensation, damage radius, phase behavior, Zanarol

中图分类号:

TE372

邹春梅,汤勇,晏军等. 凝析气藏反凝析伤害评价方法及应用[J]. 油气藏评价与开发, 2019, 9(6): 30-34.

Chunmei ZOU,Yong TANG,Jun YAN, et al. The evaluation methods and application of retrograde condensation damage in condensate gas reservoir[J]. Reservoir Evaluation and Development, 2019, 9(6): 30-34.

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参考文献 17

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参数	取值
有效渗透率/10^-3 μm²	39.50
有效厚度/m	35.80
机械表皮系数	0.10
地层温度/℃	54.20
原始地层压力/MPa	26.57
露点压力/MPa	26.57
孔隙度/%	9.19
目前产气量/（10⁴ m³·d^-1）	18.69
油的临界流动饱和度	0.25
油临界流动饱和度对应的气体相对渗透率	0.70

井名	表皮系数	井储系数/ （L·MPa^-1）	有效渗透率/ 10^-3μm²	反凝析污染状态
169	8.020	991.37	29.0	存在污染
180	10.060	435.74	12.0	存在污染
184	10.000	855.34	48.3	存在污染
625	1.430	4 772.39	7.5	轻微污染
629	-0.921	36 657.45	412.0	无污染
944	17.100	903.76	33.2	存在污染
642	0.760	8 299.80	62.5	无污染
190	14.800	991.37	21.4	存在污染
166	-2.070	6 386.24	9.4	无污染
366	9.390	1542.38	28.3	存在污染