Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 6: 121 - 128

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.06.016

Reservoir Engineering

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

  • Zhang Yanmei ,
  • Wan Wensheng ,
  • Li Chen ,
  • Luo Hongcheng ,
  • Liu Yantong ,
  • Zhang Huili ,
  • Zhang Ruixue
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  • 1. PetroChina Xinjiang Oilfield Company, Fukang, Xinjiang 831511, China;
    2. Xinjiang Xinyitong Petroleum Technology Co., Ltd., Karamay, Xinjiang 834000, China

Received date: 2020-11-17

  Revised date: 2021-09-22

  Online published: 2022-02-16

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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 J2x12-2 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

Cite this article

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 . DOI: 10.3969/j.issn.1006-6535.2021.06.016

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