Relationship between characteristics of tight oil reservoirs and fracturing fluid damage: A case from Chang 7 Member of the Triassic Yanchang Fm in Ordos Basin

被引：0

作者：

Wang, Minglei ^{[1
,2
]}

Zhang, Sui'an ^{[1
]}

Guan, Hui ^{[2
]}

Liu, Yuting ^{[2
]}

Guan, Baoshan ^{[2
]}

Zhang, Fudong ^{[2
]}

Cui, Weixiang ^{[2
]}

机构：

[1] College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing

[2] Langfang Branch of Research Institute of Petroleum Exploration and Development, Langfang, 065007, Hebei

来源：

Oil and Gas Geology | 2015年 / 36卷 / 05期

关键词：

Fracturing fluid; Ordos Basin; Reservoir; Sensibility; Tight oil; Triassic; Yanchang Formation;

D O I：

10.11743/ogg20150518

中图分类号：

学科分类号：

摘要：

Fracturing stimulation is the main method for development of tight oil. It can improve reservoir quality, but also can cause damages to reservoirs. Taking the Chang 7 Member of Yanchang Formation in Ordos Basin as an example, the relationship between the characteristics of tight oil reservoirs and fracturing fluid damage is studied based on experimental analysis, such as physical properties of reservoir, casting thin sections, scanning electron microscope (SEM), X-ray diffraction (XRD), rate-controlled mercury penetration, NMR, CT and sensitivity test. The Chang 7 Member is a typical tight oil reservoir in which the content of interstitial materials is as high as 15%. Illite, which is easy to transport and expand, accounts for a large proportion in the interstitial materials; Both pores and pore throats are of micro-nanometer scale, and the pore throats have poor connectivity. Large pores are generally controlled by small throats. The tight oil reservoir of the Chang 7 Member has moderate to weak velocity sensitivity (the damage rate of core permeability is in the range of 0.33-0.48), strong water sensitivity (the damage rate of core permeability is 0.14-0.28), and strong tendency of water blocking. Therefore, clay inhibitors, anti-swelling agents and cleanup additives should be added to the fracturing fluid formula to reduce the damage of fracturing fluid to the reservoir; salt sensitivity damage would occur when the salinity of the fracturing fluid running into the well is lower than 10, 000 mg/L; the particle size of the fracturing fluid residue is 2.25-8.39 μm. For tight oil reservoirs, various damages such as filter cakes, sediments, absorption blocking and bridge plug can occur. It is considered through integrated study that using low damage fracturing fluids is the main way to reduce the residual damage. ©, 2015, Editorial Office of Oil and Gas Geology. All right reserved.

引用

页码：848 / 854

页数：6

共 22 条

[1]

Sun Z., Jia C., Li X., Et al., Unconventional Oil and Gas Exploration and Development (I), (2011)

[2]

Zou C., Tao S., Hou L., Et al., Unconventional Petroleum Geology, (2011)

[3]

Zou C., Zhang G., Hou L., Et al., Geological features, major discoveries and unconventional petroleum geology in the global petroleum exploration, Petroluem Exploration and Development, 37, 2, pp. 129-145, (2010)

[4]

Zou C., Zhu R., Wu S., Et al., Types, character, genesis and proocts of conventional hydrocarbon accumulations: Taking tight oil and tight gas in China as an instance, Acta Petrolei Sinica, 33, 2, pp. 173-187, (2012)

[5]

Ren Z., Li W., Liang Y., Et al., Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeas-tern Ordos Basin, Oil & Gas Geology, 35, 2, pp. 190-198, (2014)

[6]

Wang Y., Lu Y., Li Y., Et al., Progress and application of hydraulic fracturing technology in unconventional reservoir, Acta Petrolei Sinica, 33, S1, pp. 149-158, (2012)

[7]

Yang H., Li S., Liu X., Characteristics and resource prospects of tight oil and shale oil in Ordos Basin., Acta Petrolei Sinica, 34, 1, pp. 1-11, (2013)

[8]

Yao T., Deng X., Zhao Y., Et al., Characteristics of tight oil in Triassic Yanchang Formation, Ordos Basin, Petroluem Exploration and Development, 40, 2, pp. 150-158, (2013)

[9]

Zhang J., Chen S., Xiao Y., Et al., Characteristics and their of the Chang 8 tight sandstone reservoirs genesis in Huaqing area, Ordos Basin, Oil & Gas Geology, 34, 5, pp. 679-684, (2013)

[10]

Jia T., The corresponding relation of clay minerals and reservoir evolution: talk zhengli oilfield fan 131 block sand beach sand dam reservoir as an example, Petroleum Geology and Recovery Efficiency, 14, 5, pp. 12-15, (2007)

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