In order to improve the oil recovery of tight sandy conglomerate reservoir

the tight oil in the tight glutenite core is extracted by the supercritical CO

2

based on the reservoir conditions of Mahu tight sandy conglomerate reservoir in Xinjiang. And then

four production parameters affecting tight oil extraction

which are the pressure（7~25 MPa）

the temperature（30~60 ℃）

the soaking time（30~180 min） and the cycle time（30~180 min）

have been optimized and analyzed by the single factor analysis method. The results show that the supercritical CO

2

can extract th

e crude oil from the tight glutenite with relatively good effects

and the extraction rate can reach up to 25.22 %. By the orthogonal design experiment L

9

（3

4

） with four factors and three levels for the above four production parameters

it is found that the factors influencing the extraction effect of crude oil by supercritical CO

2

have primary and secondary order: pressure immersion time temperature circulating time. The optimal parameter scheme is the pressure of 25 MPa

tht temperature of 50 ℃

the soaking time of 120 min

and the cyclic time of 150 min. The application of CO

2

to extract crude oil in tight glutenite reservoirs has good application prospects.