Research and application of cementing technology in Chang 6 reservoir horizontal well in Jiyuan oilfield
At present,horizontal wells are mainly developed in low permeability reservoir of Changqing oilfield.However,due to the influence of micro-fracture development,advanced water injection,multi-stage re-fracturing and other factors,it is difficult to design balanced pressure during cementing,and the quality of cement and stone bonding is poor,which seri-ously restricts the late productivity of a single well.This paper carried out cementing technol-ogy research on horizontal wells of Chang 6 reservoir in Jiyuan oilfield,introduced special ce-ment slurry systems such as composite low density,compression resistance and low friction,non-dispersion.Through slurry column structure design,remediation process optimization and optimization of centralizer,the supporting cementing technology is obtained to adapt to ab-normal well conditions such as overflow and leakage of horizontal wells in Chang 6 reservoir of Jiyuan oilfield and field tests are conducted.The good application effect has effectively im-proved the cementation quality of the horizontal well after cementing in Jiyuan oilfield.
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