A B S T R A C T The paper considers improvement of screw dies of mobile coiled tubing unit injector through the change in screw die's design parameters with further mounting of metal-ceramic based friction material. Comparison of designs of unit injector screw dies was carried out and reliability evaluation of an improved coiled tubing transporter unit was executed.

this article introduces a variation of the parameter method for solving homogeneous linear ordinary differential equations of the second order with constant coefficients, which are most often encountered in the oil and gas engineering when studying the drilling, production and pipeline transport of oil and gas. In addition, we derive a general method of solution for solving homogeneous linear ordinary differential equations of the second order with constant coefficients.

The article examines the latest achievements of foreign researchers whose key focus is to obtain gasoline fractions from the biomass of solid compounds using catalytic pyrolysis for its further use in industrial sectors. The biomass of solid compounds is studied as a raw material for production of gasoline fractions due to its low cost and high availability. In addition, several ways for obtaining and converting biomass are studied. At high temperatures (up to 800° C) solid is used to produce synthesis gas by partial oxidation in an autothermal packed bed reactor over catalysts. Biomass is an acidic flammable liquid containing more than 300 compounds. Industrial biomass is not compatible with existing liquid transportation fuels, including gasoline and diesel. In order to use biomass as a conventional liquid transport fuel, it must be catalytically modernized.

When analysing the criteria measuring the volume of oil deposits with wide gaps in configuration of reservoir parameters and physicochemical properties of fluid, it is necessary to group and characterize objects under study. Classification makes it possible to adjust conformity and distinctive features of deposits, and explain research theories. The analysis of information according to the subjects determined by the parameters measured or evaluated is difficult to carry out. It requires a lot of time and effort. Therefore, it is necessary to reduce the data volume, compress initial information to the smallest number of characteristics. Parameters can be selected from initial data or calculated and modified (i.e. minimum loss of data on the objects under study). The effective analysis tool capable of identifying the problems is the principal component analysis (PCA) which is a method for reducing the data volume. The principal component can be found in almost every text using the multivariate analysis.

The article studies the impact of drilling waste and industrial water on the fauna of the aquatic environment. The analysis of the impact of emissions on the continental shelf is presented. The study revealed that in the ecological system of the marine continental shelf, the source of pollution is drilling waste and industrial water. The latest studies of the impact of drill cuttings and industrial water on the fauna of the continental shelf were analyzed, their specific impact on inhabitants of the aquatic fauna were examined, the role of alkyl phenols and polyaromatic hydrocarbons was studied. This article also analyzes detrimental effects of formation water on the fauna of the marine world. Alkylphenols (AF) and polyaromatic hydrocarbons (PAHs), which are part of industrial water, accumulate and settle in the mitochondria of cells of living organisms. They are rapidly metabolized in the body. It was also revealed that alkyl phenols, naphthenic acids and polyaromatic hydrocarbons can disrupt reproductive functions and affect chemical, biochemical and genetic biomarkers. Water-based drill cuttings can affect the biomarkers in the filter which is manifested in the increased oxygen consumption by living organisms, which destriys the marine fauna.