Fan Jianming, Zhang Chao, Chang Rui, et al. Dynamic laws and stable production technology of Q ingcheng shale oil development in Ordos Basin[J]. ACTA PETROLEI SINICA, 2025, 46(4): 726-742.
Fan Jianming, Zhang Chao, Chang Rui, et al. Dynamic laws and stable production technology of Q ingcheng shale oil development in Ordos Basin[J]. ACTA PETROLEI SINICA, 2025, 46(4): 726-742. DOI: 10.7623/syxb202504005.
Dynamic laws and stable production technology of Q ingcheng shale oil development in Ordos Basin
Based on the development practice of volumetric fracturing in shale oil horizontal wells in Ordos Basin
and the method of combining laboratory research and field production data analysis
the paper systematically summarizes the overall production decline law of shale oil horizontal wells and differences in the estimated ultimate recovery (EUR)of single well in different types of reservoirs
as well as the variation patterns of water content
salinity
pressure
gas-oil ratio and liquid production in horizontal well intervals during different development stages. On this basis
a production system featurin
g "reasonable shut-in periods to promote reservoir equilibrium
controlled flowback for sand control in early stage
and pressure-stabilized production to preserve reservoir energy" has been developed
along with a suit of remediation technologies and processes including "sand washing
wax removal
scale removal
gas content control
and eccentric wear prevention". Under the primary energy replenishment development in shale oil horizontal wells
Type Ⅰ and Ⅱ
1
reservoirs demonstrate the average estimated ultimate recovery (EUR)of over 3.0×10
in response to the problem of low single-well production in mid-to-late development stages of shale oil horizontal wells and the demand for enhanced oil recovery (EOR)
the method of refracturing in existing horizontal wells in mature areas to create new fractures is proposed to increase EUR and EOR of single well
which is built based on preliminary field implementation analysis in combination with numerical simulation studies on reservoirs
and is predicted to increase the recovery rate by more than 5 %.