Optimization of Packing Volume for Artificial Wellbore Sand Control in Y Oilfield Based on Rock Mechanical Parameters

Aiming at the severe sand production in the unconsolidated sandstone reservoir of Y Oilfield and the insufficient accuracy of empirical and volumetric methods for sand addition calculation in traditional sand control techniques, this paper proposes an optimized method for calculating the packing volume of artificial wellbore sand control by combining rock mechanical parameter analysis and laboratory experiments. Using logging data, a relationship between shear wave transit time and compressional wave transit time was established. Calculation models for key rock mechanical parameters, such as dynamic and static elastic moduli and uniaxial compressive strength, were derived. Further, the effects of formation compaction and plastic squeezing during the packing process were quantified by integrating elastic coefficients and an in-situ stress model. Based on the porosity variation of core samples under high-pressure packing, a dynamic calculation model for packing radius was developed. By comprehensively considering formation voidage, compaction deformation, and construction allowance, an optimized sand addition formula was formulated. Practical applications demonstrated that the optimized method significantly reduced sand volume deviation compared to traditional empirical methods in 5 case wells, with some wells achieving up to 20% savings in sand usage, while maintaining stable sand control effectiveness. This study provides a scientific foundation for sand control techniques in unconsolidated sandstone reservoirs and offers valuable insights for similar oilfield development projects.