Optimization of Two - Stage Cementing Design in Xinanbian Oilfield

Xinanbian oilfield structure is located in the western edge of the slope of northern Shanbei of the Ordos Basin.From east to west of the oilfield,the oilfield cross the Ningshan Furukawa and the Furukawa between Inner Mongolia and Shaanxi,and the reservoir depth reaches to 1560-2500 m.As the formation fracture pressure is low and cementing operations section is too long,the cementing quality is difficult to guarantee.By adjusting the position of stage collar and optimizing the slurry system,the liquid column pressure of grout annulus was reduced,the leakage problem of the cementing process was solved and the quality of the reservoir sealing segment was improved.