REDUCED EVACUATION OF MATERIALS IN PROCESS OF DRILLING WELLS TREATMENT Russian patent published in 2013 - IPC E21B43/267 C09K8/80 

FIELD: mining.

SUBSTANCE: method for treatment of underground beds includes introduction of particles into hydraulic rupture cracks, and the particles contain a composite proppant, containing a base of a proppant substrate with an adhered coating of magnetic metal particles making 0.1-10% of the composite proppant mass, at least 90 wt % of which has distribution of size of 20-150 mcm, at least 90 wt % of the substrate has particle distribution by size of 8-60 mesh (250-2380 mcm), the substrate is quite strong to withstand crack closing pressure of at least 3000 pounds/sq. inch. The dispersed composite proppant, containing a base of a proppant substrate with an adhered coating of magnetic metal particles making 0.1-10% of the composite proppant mass, at least 90 wt % of which has distribution of size of 20-150 mcm, at least 90 wt % of the substrate has particle distribution by size of 8-60 mesh, the substrate is quite strong to withstand crack closing pressure of at least 3000 pounds/sq. inch. The invention is developed in subclaims.

EFFECT: increased stability of a bed and reduced particle evacuation.

20 cl, 3 ex