Kinetics of chemical reactions at thermogaschemical impact on a bottomhole zone of wells water solutions of binary mixes

UDK: 622.276.6 Пр. М.

Key words: : thermochemical gas impact, binary mixes, methods of oil production intensification

Authors: V.E. Vershinin, M.V. Vershinina (Tyumen State University, RF, Tyumen), V.B. Zavolzhsky, Yu.A. Gankin, R.A. Idiyatullin (Tsentr Neftyanyih Tehnologiy OOO, RF, Moscow), V.A. Sosnin, A.S. Zimin (State Research and Development Institute Crystal JSC, RF, Dzerzhinsk), A.N.Lishchuk (MC HMS Group LLC, RF, Moscow)

The paper studies problems of modernizing thermal-gas-chemical pay zone treatment technology for raising the productivity of wells. The focus is on increasing heat power influence on a formation while using binary aqueous mixtures injected into pore space of pay zone. We have written the equations of two-step reaction of binary mixture primary components interaction and reaction enthalpy. The paper presents the results of laboratory tests of heat release and chemical reaction rate of components interaction in binary mixtures in various temperatures and solution concentrations. The laboratory tests were conducted under two conditions: adiabatic and isothermal. They show that in case of temperature increase from 25 ^оС to 75 ^оС chemical reaction rate increases 1300 times. Under adiabatic condition a self-stimulating reaction is observed leading to a thermal explosion. The article explores catalysts influence on the chemical reaction rate. Adding aldehyde-catalyst to a binary mixture leads to a considerable increase of decomposition reaction rate even at a low temperature (20 ^оС). It shows the possibility of catalytic self-stimulation of reactions in formation conditions. Using reactor, filled with porous material in our experimental method we have confirmed the possibility of reaction self-stimulation in pore space and pressure pulse generation capable of creating a fracture network in a formation. The results of the study show that binary aqueous mixtures can actively reacts as in a borehole volume, so in pore space in formation conditions. This fact removes a well-known limits to a power of an explosive compounds. Increasing of binary mixture mass allows to increase an efficiency of thermal-gas-chemical influence on pay zone by means of thermal cleaning of pore space from asphalt, resin, and paraffin materials and creating a secondary fracture network.

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