Patent ID: 8735333

Claim:
A manufactured particle for use in a method of treatment of a well or reservoir for increasing inflow performance by removing or reducing filter cake deposited in a wellbore to increase hydrocarbon flow, the manufactured particle having a curved outer surface, and a void within the particle wherein the void extends from one side of the particle to another, providing first, second and third flowpaths through the particle, the first, second and third flowpaths extending through the center of the particle, wherein at least one of the first, second and third flow paths has a given diameter at or near the surface of the particle and expands to provide the void, the void being in fluid communication with the environment outside the particle, the particle comprising at least one chemical treatment agent provided in the void in the particle wherein the at least one chemical treatment agent comprises a solid divalent acid for breaking down the filter cake deposited within the wellbore, and wherein the first, second and third flowpaths are straight linear and run approximately perpendicular to each other, wherein the particle is essentially hollow to maximize internal volume and accommodate a large amount of chemical treatment agent relative to the volume of the particle and has a substantially constant wall thickness.