Development performance and practice of energized imbibition in an ultra-low permeability and tight oil reservoir

doi:10.3969/j.issn.1006-6535.2026.04.014

Abstract

Abstract: To address the large variability in effectiveness of water-injection energized imbibition in an ultra-low permeability and tight oil reservoir and the unclear development-technology strategies,a discrete fracture model was used,and pseudo threshold pressure-gradient and stress-sensitivity effects were considered.The technical boundaries for water-injection energized imbibition in different reservoir types and the development performance of an ultra-low permeability and tight oil reservoir under different fracture-network forms and injection parameters were investigated.Results indicate that ultra-low permeability and tight reservoirs can be classified into three types(Type Ⅲ,Type IV,and Type V),with reservoir properties progressively deteriorating.Type Ⅲ reservoirs are suitable for volume fracturing+energized displacement;Type IV reservoirs are suitable for volume fracturing+energized displacement or volume fracturing+energized huff-and-puff;reservoirs with poor connectivity or Type V reservoirs are suitable for volume fracturing+energized huff-and-puff.Recommended parameters for energized imbibition in an ultra-low permeability and tight oil reservoir include multi-stage volume fracturing,an injection volume of 15 000 m³,a shut-in time of 8-14 days,and 3 huff-and-puff cycles.Field tests of volume fracturing+energized displacement and volume fracturing+energized huff-and-puff are conducted in ultra-low permeability and tight reservoirs in Dagang Oilfield,the cumulative incremental oil production of injection-production well groups exceeds 6000.00 t within 2 years, and the cumulative oil production of huff-and-puff wells exceeds 3800.00 t over 300 days, showing significant stimulation effects.These results can provide technical support and field-practice guidance for development of analogous reservoirs.

Key words: ultra-low permeability and tight oil reservoirs, energized imbibition, complex fractures, shut-in time, injection volume, injection cycles

CLC Number:

TE357

Cao Bao, Xie Kun, Lu Xiangguo, Wen Guofeng, Chen Qi. Development performance and practice of energized imbibition in an ultra-low permeability and tight oil reservoir[J]. Special Oil & Gas Reservoirs, 2026, 33(4): 105-113.

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