页岩气超长水平段固井低摩阻柔性水泥浆体系研究OA

With the continual extension of horizontal well sections in shale gas development,cementing operations face technical challenges such as excessively high flow friction of cement slurry and susceptibility to brittleness of the cement sheath.This study developed a low-friction flexible cement slurry system by designing an elastic material with a"rigid skeleton-elastic network"structure and optimizing a polycarboxylate disper-sant.The elastic material can significantly reduce the elastic modulus of set cement by more than35%,while the dispersant effectively regulates the rheological properties of the slurry at a low dosage.Experimental results show that,under high-temperature conditions,the flow friction of this system is reduced by approximately 43.4%compared with conventional cement slurry,the elastic modulus of the cement stone decreases by nearly 10%,and the impact strength and compressive strength increase by about 5.8%and 3.6%,respectively.Moreover,the system exhibits comprehensive advantages such as low free fluid,low fluid loss,and low permeability.With good engineering applicability,this system can pro-vide reliable technical support for the safe and efficient cementing of ultra-long horizontal sections in shale gas wells.