METHOD FOR DECELERATION OF PROPPING AGENT DEPOSITION IN HYDRAULIC FRACTURING (VERSIONS) Russian patent published in 2013 - IPC E21B43/267 C09K8/80 

FIELD: oil and gas industry.

SUBSTANCE: method for deceleration of propping agent deposition in hydraulic fracturing according to the first version contains the following stages: creation of suspension of carrying fluid and propping agent that has specific gravity that exceeds specific gravity of carrying fluid; input of additive into the said suspension in a form of particles of material with low density and concentration that amounts, at least, 1% of weight from propping agent weight, note that the additive has specific gravity less than specific gravity of carrying fluid; pumping of obtained suspension into hydraulic fracturing; ascending of additive particles in carrying fluid and descending of propping agent particles in carrying fluid due to the presence of specific gravity gradient of additive, carrying fluid and propping agent; and deceleration of speed of propping agent deposition due to counteraction from collision of additive particles moving upwards and moving propping agent particles for more uniform vertical distribution of propping agent at fracturing closing. Invention has been developed in dependent claims. According to the second and third version the additive is used with concentration that amounts from 1 % of weight to 2 % of weight from propping agent weight. According to the third version the particles of polylactic acid are used as an additive.

EFFECT: provision of more uniform interlayer of propping agent with simultaneous improvement of propping agent keeping in fracturing.

10 cl, 3 tbl