Study on the performance of a new type of anti-channeling toughness high-density cement slurry system
In response to the anti-channeling problem of annular pressure in deepwater cementing operations,a combination of Dura fiber and 0.5%latex is selected indoors to improve the microstructure of cement slurry and enhance the toughness of cement slurry.The nano anti-channeling agent NT-C is developed,which is collaborated with JZ-6S composite weighting agent to adjust the density of cement slurry,then a new anti-channeling toughness high-density cement slurry system is developed.The results show that the density of the system is adjustable,the compressive strength of the cement slurry(2.4 g/cm3)is greater than 25 MPa,the impact resistance energy reaches 3.54 kJ/m2,the permeability is 0.008×10-3 μm2,the elastic modulus is less than 7 GPa.The system has good elasticity and toughness,which can effectively improve the ability to resist external water impacts.In addition,the anti-channeling strength of the cement slurry system is greater than 8 MPa/m2,the linear expansion rate reaches-0.05%.It has good sealing and anti-channeling ability,which can ensure the integrity of the cement sheath in deepwater cementing and provide technical support for the safety of oil and gas wells.
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