Research and Application of Depressure and Increasing Injection Technology in Low Permeability Oilfield


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In China, most of undeveloped oil reserves are low and ultra low permeability reservoirs. The total remaining petroleum reserves of CNPC is about 4.07×107m3, and the low and ultra low permeability reserves is 3.16×107m3, So it is important to reasonable develop the oil reserves to keep the petroleum output stable. Under the low permeability layer condition, it is difficult to inject water to the formation, and the output of oil well is very low. The chemical agent can solve the difficulty of injection water and enhance the oil recovery. The relative permeability experiments shows irreducible oil was reduced by the wettability alteration agents, and the mobile oil saturation increased, which enlarging the range of the two phases co-flowing and enhancing oil recovery. As a result with alteration agents, the cross-point relative permeability moves to right, and the core converts to water-wet. In daqing oil field test, the water injection pressure is reduced by 15%, and the term of validity is more than 10 months.



Advanced Materials Research (Volumes 347-353)

Edited by:

Weiguo Pan, Jianxing Ren and Yongguang Li




W. D. Liu et al., "Research and Application of Depressure and Increasing Injection Technology in Low Permeability Oilfield", Advanced Materials Research, Vols. 347-353, pp. 651-658, 2012

Online since:

October 2011




[1] Jadhuman dan P P. Effect of wettability on water-flood recovery for crude-oil/brine/rock systems. SPE. Rev. Eng. 1995, 10(1): 40-46.

[2] Zhu Buyao,Zhao Zhenguo. Interface Chemistry Basis. Beijing. Chemical Industry Press. 1996: 269-278.

[3] Wu Xueshi. New Method of Changing the rock surface wet ability. Drilling Fluid &Completion Fluid,1990,7(3).

[4] Liu Zhongyun, Zhen Qinghui, Tang Zhouhuai, Zhang Gongshe. Effect Of Wettability On Recovery And Relative Permeability. OIL&GAS GEOLOGY,2000,21(2):148-150.