JOURNAL OF HYDROCARBON POWER ENGINEERING

Multifunctional polymer composites for oil and gas production complex equipment

Thu, 27 Jul 2023 00:00:00 +0300

For the repair of pipeline transport, a polymer adhesive has been developed, which provides high indicators of adhesive strength. For its formation, ED-20 brand epoxy dian oligomer and plant filler with a dispersion of 400–600 nm and a content of q = 0.050–0.500 pts.wt. (per 100 pts.wt. of ED-20 epoxy oligomer) were used. Polyethylene polyamine PEPA hardener (q = 10 pts.wt.) was used to crosslink the epoxy binder. It is shown that the maximum value of tearing adhesive strength (σа = 33.6 MPa), shearing (  а = 11.2 MPa) and the minimum value of residual stresses (σres = 0.80–0.88 MPa) are characterized by materials containing filler of plant origin q = 0.075–0.100 pts.wt. Comprehensive studies of physical and mechanical properties were conducted, based on the results of which the optimal filler content in the reactoplastic matrix was established, which is q = 0.075–0.100 pts.wt. per 100 pts.wt. of epoxy oligomer ED-20 and 10 wt.h. PEPA hardener. Such composites are characterized by mechanical properties at bending: destructive stresses σfl = 102.9–118.7 MPa, modulus of elasticity E = 3.0–3.2 GPa. The content of additives of various dispersity in the ED-20 epoxy binder was determined by the method of mathematical planning of the experiment. This made it possible to obtain polymer coatings with a complex of improved mechanical properties: σfl = 107.3 MPa, E = 4.6 GPa.

Technology of forming modified epoxy composite coatings for the protection of oil and gas complex structures

V. P. Kashytskyi*, О. L. Sadova, О. B. Кlymovets — Thu, 27 Jul 2023 00:00:00 +0300

The work defines the adhesive strength of epoxy composite coatings formed by different technological modes, which
contain finely dispersed powder of titanium oxide (TiO2) and polyvinyl chloride dissolved in cyclohexanone. The highest values
of adhesive strength were obtained for two-layer coatings, in which the lower (adhesive) layer contains chromium (III) oxide
powder, and the upper (operational) layer consists of a modified epoxy polymer binder filled with treated titanium (IV) oxide
powder. The formation modes of epoxy composite coatings were optimized, for which higher values of adhesive strength were
obtained. Higher values of toughness by 40–45 % were obtained for epoxy composites, for which the forming technology
included exposure of polyvinyl chloride powder in cyclohexanone with the subsequent introduction of TiO2 powder. This ensures saturation of the filler particles surface with polyvinyl chloride macromolecules, which form additional chemical bonds and perceive dynamic loads. The practical purpose of the developed epoxy composite coating is to protect the constructions,
equipment and the oil and gas hardware complex from the influence of hydroabrasive flows during the transportation of oil and petroleum products, which is a complex effect of aggressive substances, water and temperature, which cause the appearance of areas of destruction on the internal surfaces of pipelines and equipment. The difficulty of applying epoxy composite coatings containing prepared finely dispersed titanium (IV) oxide powder is that the powder particles coagulation occurs. The use of cyclohexanone increases the manufacturability of the composition by reducing the ability of powder particles to coagulate.

Development of thermostable polymers for repair of gas production complex equipment

О.О. Sapronov*, V.V. Sotsenko, А.V. Sapronova, V.D. Sharanov, S.O. Smetankin — Thu, 27 Jul 2023 00:00:00 +0300

Polymer materials with high temperature resistance have been developed to repair the equipment of the gas production
complex. For their formation, epoxy dian oligomer DER-331, hardener triethylenetetramine TETA and multi-functional filler
oxytetracycline with a dispersion of 5–10 μm at a content of q = 0.50–2.50 pts.wt. (per 100 pts.wt. of epoxy oligomer DER-331)
were used. The thermal transformations of the developed polymers were studied by thermogravimetric analysis method (TGA)
using the derivatograph Thermoscan-2. It is shown, that polymer materials containing the filler oxytetracycline (C22H24N2O9) at q = 1.00–1.50 pts.wt. are characterized by the following parameters: the maximum of the initial mass loss temperature
T0 = 608.9–609.5 K, the final mass loss temperature Tfinal = 740.0–743.9 K, relative mass loss εrel = 66.7–67.3. Complex
assessment of thermal parameters using TGA-curves allows to ascertain the possibility of their use for the formation of coatings or adhesive materials up to a temperature of 609.5 K without changing their properties.

Risks of empirical correlations for pseudo-critical properties of natural gas

Yu. Zarubin — Thu, 27 Jul 2023 00:00:00 +0300

There are given estimates of the influence of uncertainties when using empirical correlations for pseudocritical
characteristics of natural gas with its density on the results of estimates of gas reserves and bottomhole pressures.
Modeling on the examples of the calculation of the blowout pressure in a gas well and the creation of a material balance of
a gas deposit showed that their influence on the overall modeling error can be comparable to the contribution of instrumental
errors only with high-precision measurements of pressure and temperature. When determining the gas supercompressibility
coefficient based on the pseudocritical gas characteristics, about 70 % of the errors will be associated with the variation in the
calculation of the pseudocritical temperature.

Software for adapting the material balance model of a gas field development object using the Monte Carlo method

Yu. Zarubin, V. Zarubin — Thu, 27 Jul 2023 00:00:00 +0300

The publication is a logical continuation of works on the creation of convenient software for operational analysis and
forecasting of indicators of a separate gas field development object based on the material balance model. The main requirements
for such a software object were accessibility, low costs for hardware and software, ease of use for a researcher without special
computer and mathematical knowledge, a minimum of input data, which in turn protects against unreliable, and sometimes
unavailable model parameters. The software, with a minimum of information and labor costs, allows to identify the mode of
operation of the deposit, estimate the initial gas reserves, determine the activity of the water-bearing zone, give a forecast of gas
and condensate production according to the modes of operation of the wells.