Structure and Performance Test of Super Elastic Casing Protective Nanofluidic System-Based Protective Casing Jacket

In order to relieve the non-uniform loading on casing and solve gas channeling problems from pressure and temperature changes,this paper presents a super elastic casing protective jacket.It is a nanofluidic system-based jacket for the casing that has unique volume changing characteristic under varied temperature and pressure.The scientific principles underpinning the jacket design are found in nanofluid structures.For example,the MFI zeolite-water system is taken as an example filling formula and the performance is evaluated from pressure-volume test and temperature change test.The pressure-volume test shows that the functional fluid(water) can flow into and out of the nanopores spontaneously with the change of external pressure and temperature.Such flow balances the change of external pressure and temperature via volume change and helps to reduce the risk of casing failure and gas channeling.In the temperature change test,the casing protective jacket exhibits excellent characteristics.The threshold pressure decreases with the rising of environmental temperature,and its deformability increases with the rising of environmental temperature between 30 to 75℃.Studies indicates that gas channeling under complex conditions can be effectively solved by protective jacket with appropriate formula based on the strength of its deformation coordination ability under pressure and temperature changing.