Various problems exist in the development of Fuyang extra-low permeability oil layer using water flooding, including injection difficulty, recovery difficulty, low effectiveness, and low recovery rate. To solve these problems, a CO2 flooding test was carried out at Shu101 well block in Daqing Yushulin Oilfield. Systematic evaluation of the displacement state, development characteristics and effects of CO2 flooding was conducted. The results show that when the injection rate of CO2 was 0.1 HCPV, through comparison of high pressure physical properties of two samplings, the light component increased by 5.7%, and the minimum miscibility pressure decreased from 32.2 MPa to 28.6 MPa, a drop of 3.6 MPa. Three kinds of displacement states existed in the test area: miscible, semi-miscible and immiscible phases, which account for 2/8, 1/8, and 5/8, respectively. Through research and oilfield practice, the development and adjustment technology of CO2 flooding for different gas injection stages and different types of wells was developed. The oil recovery rate in the test area remained above 1% for four consecutive years. Numerical simulation predicted that the ultimate recovery using CO2 flooding will be 10% higher than that using water flooding.
ZHANG Yingzhi
,
YANG Tiejun
,
YANG Zhengming
,
XIAO Qianhua
,
WANG Xiangyang
. Evaluation of oil displacement by CO2 at Fuyang extra-low permeability layer in Yushulin oilfield[J]. Science & Technology Review, 2015
, 33(5)
: 52
-56
.
DOI: 10.3981/j.issn.1000-7857.2015.05.007
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