Law of Motion of Packing sand Particles in High Pressure Packing Sand Control Operation

When the packing sand particles along with the sand carrier enters into the formation, the movement state of them has great effects on the performance of high pressure packing sand control, which is also the crux of the research on high pressure sand control mechanism. While packing sand particles passing the well bore, blast hole and annular space, the stress and the movement of them are analyzed based on the solid-liquid two-phase flow theory. What's more, the relations between the maximum acceleration distance, the jet velocity, and the flow of sand carrier are obtained. It is indicated that the settling velocity is equivalent when the packing sand particles pass the well bore; the distance is short when the coarse sands outside of the casing pipe move in the radial direction; the acceleration distance of packing sand particles is shorter than the bore depth