Bottom Water Injection Method and Its Application in Low-Permeability Bottom-Water Reservoirs

doi:10.7657/XJPG20250315

Abstract

Abstract:

The Jurassic bottom-water reservoirs in the Ordos Basin suffer from insufficient natural energy, low pressure coefficient, low permeability, and strong reservoir heterogeneity, and they exhibit a rapid rise in water cut and low recovery when developed by conventional water injection process. To improve the development effects of such reservoirs, the concept of bottom water injection was proposed. In respect of five key factors influencing the development effects of bottom-water reservoirs, i.e. bottom-water energy, permeability anisotropy, barrier permeability, interlayer frequency, and sedimentary rhythm, oil-layer water injection and bottom water injection were compared for recovery by using reservoir numerical simulation. The results indicate that bottom water injection effectively enhances bottom water energy, facilitates uniform elevation of the oil-water contact, and significantly extends oil production period with medium-low water-cut. Compared with oil-layer water injection, bottom water injection improves ultimate oil recovery by more than 10%.

Key words: Ordos Basin, Jurassic, low-permeability bottom-water reservoir, numerical simulation, injection position, bottom water injection, enhanced oil recovery

CLC Number:

TE348

SONG Peng, ZHANG Xingang, YANG Weiguo, WANG Nan, SHI Jian, XIE Qichao, DUAN Wenhao. Bottom Water Injection Method and Its Application in Low-Permeability Bottom-Water Reservoirs[J]. Xinjiang Petroleum Geology, 2025, 46(3): 375-381.

Figures/Tables 9

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Table 1.

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韵律类型	渗透率/mD
韵律类型	5倍级差	20倍级差	60倍级差	160倍级差	200倍级差
正韵律	6.30	1.80	0.60	0.24	0.19
	12.60	10.30	9.50	9.60	9.60
	19.00	19.00	19.00	19.00	19.00
	25.20	27.40	27.20	28.50	28.50
	31.50	36.00	36.00	37.76	37.81
反韵律	31.50	36.00	36.00	37.76	37.81
	25.20	27.40	27.20	28.50	28.50
	19.00	19.00	19.00	19.00	19.00
	12.60	10.30	9.50	9.60	9.60
	6.30	1.80	0.60	0.24	0.19