| 摘要 |
The invention relates to the extraction of fluids from underground formations by means of hydraulic fracturing. The technical aim consists in improving the non-uniform placement of a propping agent. The propping agent consists of a material in the form of particles having a base, an outer water-soluble coating and a gelling agent, said gelling agent being immersed in the water-soluble coating in such a way that it is released from the base of a particle when the water-soluble coating is dissolved or destroyed upon introduction of the propping agent into portions of a hydraulic fracturing fluid. A method for the heterogeneous placement of a propping agent in a hydraulic fracture includes pumping alternating portions of hydraulic fracturing fluid, said portions containing and not containing the aforementioned particles, into a layer which is to undergo fracturing, under a pressure which exceeds a hydraulic fracturing pressure, through a plurality of clusters of perforations in a wellbore in the layer to be fractured, where the portions of hydraulic fracturing fluid containing the particles act as supports after the hydraulic fracture closes. |
