Enhanced gas-condensate production by wettability alteration to gas wetness

被引：56

作者：

Li, Kewen ^{[1
,2
]}

Liu, Yijiang ^{[3
]}

Zheng, Hongwen ^{[3
]}

Huang, Guixiong ^{[3
]}

Li, Ganqin ^{[3
]}

机构：

[1] Stanford Univ, Stanford Geothermal Program, Stanford, CA 94305 USA

[2] China Univ Geosci, Beijing 100083, Peoples R China

[3] Sinopec, Beijing, Peoples R China

来源：

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING | 2011年 / 78卷 / 02期

关键词：

wettability alteration; gas wetness; experimental study; enhanced production;

D O I：

10.1016/j.petrol.2011.08.001

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Many gas-condensate reservoirs experience a sharp drop in gas production due to condensation near the wellbore as pressure drops lower than the dew point. Wettability alteration approach has been demonstrated successful in laboratory. However few experiments have been conducted in real reservoir rock with a low permeability. The gas-condensate reservoirs impaired by condensation near the wellbore usually have low permeabilities. In this study, we conducted experiments in the rock sampled from the target gas field (Dongpu). Firstly a new and cheaper chemical was developed to change the rock wettability from preferential water- to gas-wetness effectively. This chemical was thermally stable at a temperature of 170 degrees C. Experimental results also showed that this chemical was effective at very high salinity. Secondly spontaneous water imbibition tests were run to show the effect of wettability alteration on recovery. Thirdly relative permeability data of gas and water were measured with and without wettability alteration to preferential gas-wetness. Experimental results demonstrated that the relative permeabilities of both the gas and the water phases were increased significantly after the wettability alteration to preferential gas-wetness. The residual water saturation was decreased and the gas production was enhanced greatly due to the wettability alteration. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：505 / 509

页数：5

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