The invention relates to methods to stimulate formation production when
oil recovering. Reducing cost and simplifying the manufacture of the
propping material to prevent proppant carrying-over were achieved owing
to the injection of the hydraulic fracturing liquid with a propping agent
containing a propping material as randomly cut particles of the polymers
reworked and being in irregular shapes with the maximum-to minimum size
ratio more than 5. A propping material should be a material being
resistant to hydraulic fracturing liquid, oil, gas condensate and
oil-containing liquids, and salt water in the range of temperatures 40 to
140.degree. C., plastic within pressure range of 7 atm to 700 atm, and
having Young's modulus within 100 MPa to 20000 MPa. The propping material
thickness can be within 10 to 500 micrometers. The propping material can
be of flake-like, lamellar, and chip-like shapes or their mixture. The
propping material content of the propping agent should be 0.1 to 30% by
weight of the total propping agent mixture with the propping material.
The propping material should be used for the hydraulic fracturing phase
or at the end propping phase combined with portion of 10 to 50% of the
total weight of the propping agent with the propping material.