An experimental research on gas-injection huff and puff recovery after the cold heavy-oil production of foamy-oil reservoirs

被引：0

作者：

Sun, Xiaofei ^{[1
]}

Zhang, Yanyu ^{[1
]}

Cui, Guoliang ^{[1
]}

Li, Xingmin ^{[2
]}

Duan, Xuewei ^{[1
]}

机构：

[1] College of Petroleum Engineering, China University of Petroleum

[2] PetroChina Research Institute of Petroleum Exploration and Development

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2013年 / 34卷 / 06期

关键词：

Characteristics of dissolved gas; Enhanced oil recovery; Foamy oil; Huff and puff; Natural gas; Unconventional experiment;

D O I：

10.7623/syxb201306014

中图分类号：

学科分类号：

摘要：

Taking degassed oil and active oil as a reference, an unconventional PVT experiment was carried to reveal features of gas dissolution in foamy oils and to define the dissolution capacity of natural gas in foamy oils and influential laws of formation pressure on gas dissolution. In addition, the feasibility of gas huff and puff development in enhancing oil recovery was evaluating by means of a core displacement experiment, and effects of gas-injection occasions and cycles on gas huff and puff development of foamy oils were also defined. The experimental results showed that the process of natural gas dissolution can be divided into three stages, i.e. rapid dissolution, fluctuation decline and stable stages. At the early stage of gas injection, the gas dissolution rate is relatively great and the volume of cumulative dissolved gas increases rapidly. The dissolution capacity of natural gas decreases gradually with depth increasing, which can form a certain vertical miscible area. An increase in formation pressure can increase the gas dissolution rate and volume of cumulative dissolved gas. The dissolution capacity of natural gas in foamy oils is smaller than that in active oil and degassed oil under different pressure, but the total gas volume in foamy oils is the highest and the viscosity of foamy oils is lowest at the same depth. Compared with cold production, gas huff and puff experiment demonstrated that gas huff and puff development for three cycles can increase the oil recovery by 7.8%. The gas injection occasion should be between bubble point pressure and quasi-bubble point pressure. Soaking time should not be too long, and the formation pressure be increased maximumly.

引用

页码：1143 / 1149

页数：6

共 20 条

[1]

Li S., Li Z., Lu T., Et al., Experimental study on foamy oil flow in porous media with Orinoco belt heavy oil, Energy & Fuels, 26, 10, pp. 6332-6342, (2012)

[2]

Maini B.B., Sarma H.K., George A.E., Significance of foamy-oil behavior in primary production of heavy oils, Journal of Canadian Petroleum Technology, 32, 9, pp. 50-54, (1993)

[3]

Liu Y., Wan R.G., Jian Z., Effects of foamy oil and geomechanics on cold production, Journal of Canadian Petroleum Technology, 47, 4, pp. 55-61, (2008)

[4]

Mu L., Han G., Xu B., Geology and reserve of the Orinoco heavy oil belt, Venezuel, Petroleum Exploration and Development, 36, 6, pp. 784-789, (2009)

[5]

Mu L., Development actualities and characteristics of the Orinoco heavy oil belt, Venezuela, Petroleum Exploration and Development, 37, 3, pp. 338-343, (2010)

[6]

Chen X., Qin J., Visualization study on foamy oil flow state, Journal of Southwest Petroleum University: Science & Technology Edition, 31, 6, pp. 126-130, (2009)

[7]

He J., Liao G., Wang Z., Oilfield development strategy and replacement techniques, Acta Petrolei Sinica, 33, 3, pp. 519-524, (2012)

[8]

Shen P., Yuan S., Han D., Et al., Research on potential evaluation and development strategy of EOR technology for onshore oil fields in China, Acta Petrolei Sinica, 22, 1, pp. 45-48, (2001)

[9]

Wei H., Yue X., Zhao Y., Et al., An experimental investigation of the nature gas immiscible displacement in ultra-low permeability reservoirs, Acta Petrolei Sinica, 32, 2, pp. 307-310, (2011)

[10]

Li S., Zhang Z., Ran X., Et al., EOR Techniques with Gas Injection, pp. 22-24, (2001)

← 1 2 →