The laboratory “Drilling mud surfactants and acid systems for oil production” of the Institute of Field Chemistry at Gubkin Russian State University of Oil and Gas conducted original researches of dissolvability of proppant ForeProp (fraction 16/30) in various acid compositions. In order to define the dissolvability of proppant ForeProp (fraction 16/30) 2 g of proppant, weighed to a precision of 0.0001 g was placed in a lidded teflon glass and heated up to the test temperature. After that the estimated amount of acid, heated up to the test temperature, was added. The amount of acid should acid the numerical value of the surface area of the tested proppant by 2.5 times. In order to define surface area of the proppant, the length of proppant particles evenly lined to a precision of 0.1 mm was measured. The particles of the proppant are believed to have the form of a globe. On the basis of the number of the particles the diameter of one particle was calculated. Then they defined the area of its surface and the area of surface covered by all measured particles. Knowing the surface area of the measured particles, we could calculated the surface area of the proppant weigh, taken for the test.