PSI - Issue 59

Liubov Poberezhna et al. / Procedia Structural Integrity 59 (2024) 739–744 Liubov Poberezhna et al. / Structural Integrity Procedia 00 (2019) 000 – 000

740

2

1. Introduction The issue of ensuring the country's energy security is closely related to the protection of people and the environment. At all stages of prospecting, exploration and development of oil and gas fields, production and transportation of hydrocarbon energy carriers, certain components of the environment are significantly affected (Gossen et al, 2006; Anifowose et al., 2016; Fugiel et al., 2017; Poberezhnyi et al, 2017; Hryhorskyi et al, 2022). Laying new pipelines, intensifying the flow of hydrocarbons to wells at the final stage of field development, and changing oil and gas transportation routes due to logistical changes in the market pose potential technological and environmental risks (Winer, 2003, Kharaka, et al. 2005; Brittingham et al, 2014; Chudyk et al., 2019). However, refusing to do so means significantly weakening, and in some sectors even losing, energy independence. The oil and gas complex is a complex system that includes a large number of technological processes that pose a significant potential danger to the environment. The main pollutants are formation fluids - oil, gas, formation water, and, to a lesser extent, chemicals and materials used to support the production activities of oil and gas companies during well drilling and stimulation of oil and gas production (Rana, 2008; Pichtel, 2016; Yatsyshyn et al, 2022). The penetration of reservoir fluids into environmental components causes the accumulation of pollutants and, as a result, deterioration of the quality of atmospheric air, surface and groundwater, and soil. In addition, many environmental problems have accumulated within oil and gas fields during their operation, which are very difficult to solve today (Pierce, 2009; Zoback et al, 2010; Pascual et al, 2016; Yavorskyi et al, 2017; Poberezhny et al, 2017; Martins et al, 2019; Poberezhna et al, 2022). In the process of operation, oil and gas production equipment is exposed to constant exposure to corrosive media (formation water, process fluids, etc.) and mechanical stresses, and a significant number of emergencies are directly or indirectly caused by corrosion and mechanical damage (Petryna et al, 2016; Andreikiv et al.; Poberezhny et al, 2017; 2019; Zvirko 2021; Zvirko et al, 2021; 2022) to equipment components, drill and casing pipes. The aim of the work is to assess the influence of the corrosive activity of produced waters on the corrosion fracture of carbon steel P110, affecting the lifetime of the oil well equipment, and the associated technoecological risks from petroleum production processes near nature conservation areas. 2. Methodology The object of research was carbon steel P110 (Table 1), which is widely used by oil and gas companies. For corrosion tests, 6 samples of formation water were collected from different wells of the Karaykoziv field (Ukraine). The results of their chemical analysis are shown in Table 2.

Table 1. Chemical composition of P110 steel. Component C Si

Mn

Cr

Mo

P

Ni

S

Fe

Concentration, wt. %

0.25

0.20

1.40

0.15

0.01

0.01

0.012

0.003

>97

Corrosion tests were performed at temperatures of 60 o С and 90 o С, based on the depth of productive horizons . The corrosion rate was determined gravimetrically and calculated by the formula:

6 1 2 8.76 10 (m m )  

K

,



S t

 

where K is the corrosion rate, mm/year; m 1 – weight of the sample before the test, g; m 2 – weight of the sample after the test, g; S is the initial area of the sample, mm 2 ; t – time, h; ρ – density of the material, g/cm 3 . To analyze the influence of oil and gas deposits and oil and gas prospective areas on the nature-reserved territories of Ukraine, fund and archival materials on the location of oil and gas deposits and oil and gas prospective areas and objects of the nature reserve fund of Ukraine were developed. Literary sources, raster maps, and atlases, website materials, and statistical data were analyzed.