Cementing Technology for Horizontal Shale Oil Wells in Jimusaer
The cementing of horizontal shale oil wells in Jimusaer mineral rights transfer block of Ji-lin Oilfield faces some technical challenges,such as difficulties in the wellbore shrinkage of salt-gyp-sum layers,drilling fluid loss of coal seam,high performance requirements for cement top of vertical wellbores,safe casing running,and quality of cementing.After field exploration test,the cementing quality is improved through optimization of cement slurry system,accurate calculation of annulus vol-ume and centralizer placement design;and the safe casing running is guaranteed by reinforcement of well drifting operation,software simulation of casing running,and improvement of lubricity and rheo-logical property of drilling fluid.The proposed cementing technology is applied to 12 wells in the ar-ea,and the cementing qualified rate is 100%,which indicates that the cementing technology is suit-able for this block and could effectively guide site operation.
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