Study on Well Spacing Limit for Conventional Water Flooding and Carbon Dioxide Flooding in Low-permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2021.02.018

Abstract

Abstract: In order to realize the optimal design of well spacing for low-permeability reservoirs in Jilin Oilfield, based on a case study of Fuyu oil reservoir in Jilin Oilfield, pressure gradient test was conducted, a curve was prepared to indicate the relation between starting pressure gradient and permeability of water flooding and carbon dioxide flooding, and a reasonable well spacing design drawing was drawn for water flooding and carbon dioxide flooding with reference to reservoir pressure distribution law in a mode of "one for injection and one for production". the results of the study show that the minimum starting pressure gradient of the low-permeability Fuyu reservoir had a negative power exponential relation with the permeability, and the minimum starting pressure gradient of the same core water flooding was 2 to 4 times that of carbon dioxide flooding under the condition that the injection-production pressure difference was 15 to 25 MPa; when the reservoir permeability was lower than 0.10 mD, the upper limit of the reasonable well spacing for carbon dioxide flooding was greater than that of water flooding, which was more beneficial for development; when the permeability was from 0.05 to 0.10 mD, the associated reasonable well spacing range was from 120 to 380 m; when the reservoir permeability was greater than 0.10 mD, the water flooding cost was much lower and much favorable for development; when the permeability is from 0.10 to 0.20 mD, the reasonable well spacing range was from 70 to 120 m. The study results provide an important reference for the selection of reasonable well spacing with different medium flooding in Fuyu reservoir in Jilin Oilfield.

Key words: starting pressure gradient, low-permeability reservoir, reasonable well spacing, water flooding, carbon dioxide flooding, Fuyu oil peservoir, Jilin oilfield

CLC Number:

TE348

Yu You, Wei Jianguang, Zhang Baozhong, Li Jiangtao. Study on Well Spacing Limit for Conventional Water Flooding and Carbon Dioxide Flooding in Low-permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2021, 28(2): 120-125.

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