New Sintanyl Phosphonates for Protection of Oil and Gas Pipelines from Steel Corrosion

Abstract

Many corrosion inhibitors are economically disadvantageous or toxic to the environment. Additionally, there are certain requirements for corrosion inhibitors. Therefore, the development of new corrosion inhibitors is one of the important problems in the oil-producing and oil-refining industry. The purpose of this work is the synthesis of new corrosion inhibitors with high inhibitory activity, the establishment of the structure of the compounds obtained and the determination of the anti-corrosion effect with respect to aggressive media. This paper presents the results of research on the development of new iron corrosion inhibitors. New α-aminophosphonates were synthesized based on the Kabachnik-Fields reaction. Formalin, morpholine, phosphite containing residues of industrial non-ionic surfactants - syntanols as radicals were used as a raw material. The compounds obtained were isolated in high yield. The structure of the compounds obtained is established by modern methods of physico-chemical analysis. The protective effect of the compounds obtained was studied by a gravimetric method for 6, 24, 72 hour exposure and an inhibitor concentration of 10, 25, 50, 100 ppm. As an aggressive medium, a highly mineralized medium containing СО2 and Н2S was used in simulated formation water. The dynamics of changes in the protective effect of the resulting aminophosphonate from time to time, at dosages of 2.5-100 ppm, were studied using electrochemical analysis methods. The protective effect of syntanyl-O-ethyl- (N-morpholinyl) methylphosphonate obtained at 25 ppm and a shutter speed of 6 hours is 73-82%. The article shows that with increasing concentration, an increase in the protective effect is observed. The greatest protective (89,6) effect showed O-2- [2- [2- [2- [2- [2- [2- [2- [2- [2- (dodecyloxy) ethoxy] ethoxy] ethoxy] ethoxy ] ethoxy] ethoxy] ethoxy] ethoxy] ethoxy] ethyl-O-ethyl- (N-morpholinyl) methylphosphone at a dosage of 100 ppm.

A Review of Recent Advances in the Inhibition of Sweet Corrosion

“…Several studies reported in the past decade on the corrosion inhibition of different types of steel in a CO 2 /H 2 S coexisting environment, [66–67,71a‐c,72,76,115,131d,140] as presented in Table 2. The solutions employed in these studies, consisting of either NaCl solutions [71–72,76,115,131d,140a] or brine and simulated oilfield waters, [66–67,140b,c] were usually saturated with both CO 2 and H 2 S. In a few of these studies, the authors also reported on the influence of either the pressure/concentration of CO 2 and H 2 S or their ratio on the corrosion inhibition of the respective CIs [66,72,76,115,140a] . In addition, Qiu et al [140b] .…”

“…Nikitin et al [140c] . synthesized three new complexes of syntanyl‐ O ‐ethyl‐( N ‐morpholinyl) methylphosphonate and studied the impact of an increase in immersion time on the corrosion inhibition effectiveness of these complexes when employed as CIs for steel immersed in simulated oilfield water containing 250 g/m 3 CO 2 and 200 g/m 3 H 2 S. The authors concluded that for low immersion times (i. e. 6 h of immersion) the compounds with a lower degree of oxyethylation gave the highest corrosion inhibition effectiveness.…”

Micro-hardness variation of micro-phases during spheroidisation of AISI4340 steel

“…In as-bought and normalised also there is a continuous reduction in the hardness values of the corresponding phases during spheroidisation. It is the indication of continuous stress relaxation and annihilation of crystal defects due to continuous isothermal soaking (Ismail et al, 2016;Nikitin et al, 2019;RSengupta et al, 2019;Suryo et al, 2018)…”

An Adaptively-damped Compressible-liquid Model for Non-cavitating Hydraulic Surges

“…Numerical detection of cavitation damage level and location on dam spillways is presented in [8]. Corrosion is another factor that determines the safety of pipelines, and the protection systems are essential against corrosion, especially for oil and gas pipelines [9].…”