Abstract: Large-scale fracturing of horizontal wells requires the higher performance of cement, which requires not only a certain compressive strength but also a certain deformation ability. The current commonly used standardisno longer meet the requirements of cement sheath sealing for horizontal well large-scale fracturing. Based on the stress analysis model of the cement sheath under fracturing conditions, a design method for cementing cement performance that can meet the requirements of largescale fracturing sealing is proposed with consideration of cement sheath tensile failure and interface failure. We established a cementing stone performance index control chart including elastic modulus, Poisson's ratio, and tensile strength (or yield strength), and quantified the Young's modulus, Poisson's ratio, and tensile strength (or yield strength) of the cement stone. The performance design of cement stone based on the index control chart can effectively reduce the risk of damage to the cement ring. A control board for the performance index of large-scale fracturing horizontal well cementing cement in the Mahu Oilfield was established. According to the requirements of the cement stone performance index control chart, the elastic-toughness cement slurry system was selected, and more than 10 wells were applied in the field. The reservoir fracturing reconstruction with a surface construction pressure of 90 MPa was successfully completed.

Key words: cement stone, control chart, fracturing, horizontal well, cementing