The dissertation is devoted to solving scientific and practical problems of integrated environmental solutions to the problem of drilling waste management, namely drill cuttings, spent drilling mud, analysis of the level of technogenic load in oil and gas production regions. Among the many technological schemes, methods and techniques of drilling waste utilization, there is no fully effective and environmentally safe technology. This is because the geological and climatic features of the territories and technological aspects of the work are often not taken into account. Therefore, the scientific substantiation, development, and implementation of the most optimal technological scheme for the utilization of drilling waste, taking into account individual parameters and characteristics of the waste, is an urgent problem that the dissertation research is aimed at solving. The aim of the work is to develop and implement an environmentally friendly drilling waste management technology, namely the separation of drill cuttings into phases under centrifugal forces using coagulants and flocculants with the subsequent use of the resulting phases. The main objectives of the dissertation research were to analyze the impact of drill cuttings on the environment and modern methods and technologies for their management; to develop a methodology for conducting an experiment and studying the properties of drill cuttings; to assess the environmental safety of drill cuttings before and after separation; to establish the degree of dewatering of drill cuttings in a centrifuge depending on the type of drilling mud base and its rheological properties; substantiation of the intensification of the drill cuttings separation process by adding coagulant and flocculant; mathematical modeling of the drill cuttings separation process in the field of centrifugal forces; improvement of the technological scheme of environmentally safe drill cuttings utilization technology; assessment of damage for soil surface contamination by drill cuttings and environmental and economic efficiency of the developed technology. The thesis is a completed research in the scientific field of environmental protection technology. The main provisions, development and substantiation of the scientific novelty and practical significance of the dissertation were obtained by the author independently. The main results of the work were presented and published in the proceedings of international and national conferences and scientific journals. The following new scientific and practical results were obtained in order to improve the level of environmental safety of oil producing areas and the efficiency of drilling waste management. For the first time, the scientific and methodological bases of chemical intensification of the process of purification of spent drilling mud with the separation of the solid phase based on the rheological properties of the drilling mud were developed, which made it possible to increase the level of environmental safety of the studied process. Dependences of the depth of oil penetration in the soil on the parameters of the soil, oil, and the environment were obtained, in particular, soil moisture and porosity. The technological scheme of environmentally friendly drilling waste utilization technology was improved by using a high-efficiency centrifuge VSD-950 for separation of drilling waste and intensification of the process by adding optimal doses of aluminum sulfate coagulant and chitosan flocculant. An engineering calculation of the main equipment of the VSD-950 centrifuge based on energy consumption was carried out, which allows us to substantiate the feasibility and economic efficiency of its use in the developed technological scheme. The ecological and economic effect of the proposed environmental protection technology implementation due to savings on environmental tax payment and damage for soil contamination with drilling waste, which amounts to 2 595,240 UAH thousand, is estimated. The ecological and economic efficiency of the developed technology is calculated, taking into account the capital and current costs of the project, which amount to 328,307 UAH thousand.
