Pilot Test of CO2 Miscible Displacement for Extra High Water Cut  Reservoir in Xishanyao Formation of Block Cai 9

doi:10.3969/j.issn.1006-6535.2021.06.016

Abstract

Abstract: At present, the oil reservoir in Xishanyao Formation in Well Block Cai 9, Cainan Oilfield is high in water cut and low in production, with a well development rate of only 23.0%, and it will be abandoned and shut down. In order to improve the productivity and reduce the water cut of the ultra-high water-cut reservoir in this well block, analogy method, reservoir engineering and numerical simulation method were employed to analyze the feasibility of CO₂ miscible displacement, develop reservoir engineering design, and perform pilot test. The results showed that Well Block C2576 in inverted seven-spot pattern with small spacing was selected as the pilot test area, Sublayer J₂x₁^2-2 rich in remaining oil was selected as the injection layer, the reasonable injection rate was 0.3 times the pore volume (the CO₂ injection rate on ground was 10 500 t ), the gas injection velocity was 30-40 t/d, and the injection-production ratio was 1.1-1.2. The field test proved that after 4 529.7 t CO₂ injected cumulatively into this well block, the cumulative oil increase reached 1 269 t, and the oil displacement efficiency was 0.27 t/t after CO₂ injection, achieving a good stimulation effect. This research provides technical support for the pilot test, overall adjustment and development of CO₂ miscible displacement in Cainan Oilfield.

Key words: CO₂ miscible flooding, ultra-high water-cut reservoirs, reservoir engineering, enhanced oil recovery, Cainan Oilfield

CLC Number:

TE357.7

Zhang Yanmei, Wan Wensheng, Li Chen, Luo Hongcheng, Liu Yantong, Zhang Huili, Zhang Ruixue. Pilot Test of CO₂ Miscible Displacement for Extra High Water Cut Reservoir in Xishanyao Formation of Block Cai 9[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 121-128.

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Pilot Test of CO₂ Miscible Displacement for Extra High Water Cut Reservoir in Xishanyao Formation of Block Cai 9

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