IMPROVEMENT OF FLOATATION ABILITIES OF MATERIALS FOR WELL TREATMENT Russian patent published in 2013 - IPC E21B43/267 C09K8/80 B32B5/16 

FIELD: oil and gas industry.

SUBSTANCE: treatment method of an underground formation, at which fractures in the formation are filled with particles containing composite proppant; at that, the above composite proppant includes a proppant substrate capable of maintaining closing pressure of at least about 5000 psi (35 MPa), and bonded coating of disperse material with actual density that is less than apparent density of the proppant substrate; at that, disperse material has actual density of less than 0.5 g/cm³ and at least 90 wt % of disperse material have particle size distribution in the range of 75 to 150 micron. Disperse composite proppant includes a proppant substrate capable of maintaining closing pressure of at least about 5000 psi (35 MPa), and bonded coating of disperse material with actual density that is less than apparent density of the proppant substrate; at that, disperse material has actual density of less than 0.5 g/cm³ and at least 90 wt % of disperse material have particle size distribution in the range of 75 to 150 micron. Invention is developed in dependent claims.

EFFECT: retardation of proppant deposition rates at maintaining the ability of functioning at higher closing stresses.

20 cl, 2 ex, 1 tbl, 1 dwg