Studying of physical-chemical properties of proppants with some special characteristics
The article considers general factors affecting both successful implementation of a formation hydraulic fracturing and its aftereffects, namely, increase of a formation water-flooding and decrease of flow-rate after some definite period of time. The author of the present article suggests compositions on the basis of opoka, which do not react to hydrochloric acid, do not soak in water and possess adsorption properties. Highly-siliceous varieties are the strongest ones. Their strength per mono-axial compression in absolutely dry condition reaches 80-90 MPa, in water-saturated condition it doesn’t exceed 24-34 MPa. Sandy varieties are less strong (32…35 and 14…17 MPa) and clayish varieties are even weaker (13… 20 and 2…7 MPa). Besides the above-mentioned characteristics of opoka, there exists some unique possibility of the rock preliminary saturation by the required selective water-isolating compositions due to opoka’s adsorption properties followed by these reagents’ pumping to a formation while performing a formation hydraulic fracturing. This provides solving the problem of inflow intensification and selective water-isolation, e.g. selective phase permeability by water. In this case permeability of hydrocarbons in a proppant crack doesn’t decrease.