Veligotskyi D. Increasing the effectiveness of the chemical-technological process used in the complex hydrogen thermobaric-chemical technology for stimulation hydrocarbon production

The dissertation is dedicated to solving a topical scientific-and-practical problem of increasing the effectiveness of the chemical-technological process for intensifying hydrocarbon production, which is based on an integrated usage of anomalous properties of hydrogen as an activator of diffusion and filtration processes. An experimental complex was developed to study the kinetics of thermobaric-chemical processes and for physical modelling of the integral effect, including the hydrogen one, on the change of flow properties and permeability of the rock. The complex recreates the technological features of the chemical-technological process and ensures its flow in conditions utmost close to those in real formation ones. Methods were suggested for affecting the character of flow of the multistage thermobaric-chemical process and increasing its effectiveness, in particular, its hydrogen stages. Experiments have proved that adding hydroreacting substances based on aluminium and sodium to basic process fluids helps produce hydrogen at the low-temperature stage of the process. Hydrogen acts as an activator of diffusion and filtration of the fluid in the rock. Using 0,7-0,95% of a polymer nitrile paracyanogen synthesised to a refined technology as an activator of the combustion process increases the temperature and duration of the high-temperature stage of the chemical-technological process. This is done to a level at which, with the presence of activated hydrogen, processes of partial hydrocracking of heavy hydrocarbons occur directly in the formation. A technique was developed for determining the most effective chemical-technological process for the technology of integrated hydrogen thermobaric-chemical effect. It is based on a comparative analysis of the results of action of chemical-technological processes, differing in nature, on the recovery of the permeability of colmataged rock cores. The computer 3D model of the multistage process of the hydrogen thermobaric-chemical effect on production horizons of wells was refined. Its refinement method accounted for the results of experimental study of the unsteady process of recovery of rock permeability due to the integrated hydrogen thermobaric-chemical action. The refined and verified model describes with high accuracy the flow of filtration-diffusion and heat-and-mass transfer processes in actual chemical-technological processes during the treatment of productive formations, enabling to make prognostic evaluations about treatment results. The algorithm developed for preparing to implement the technology with account of the results of physical and mathematical simulation was used in exploratory-industrial introductions of the technology at wells in Ukraine, India, Georgia, and Turkey. The results have confirmed the high effectiveness of the refined and used chemical-technological processes in both vertical and horizontal wells.