凝析气藏反凝析伤害评价方法及应用

Abstract

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

CLC Number:

TE372

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.

Figures/Tables 9

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References 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

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

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