Use of hydrophobized soils in oil and gas pipeline construction
DOI:
https://doi.org/10.32347/2410-2547.2025.114.292-298Keywords:
degradation, flooding, hydrophobization, permeability, loamsAbstract
For the first time, systematic experimental and field tests on the effect of hydrophobized soil on the corrosion activity of underground pipelines were carried out in the work. Field, laboratory, and in situ tests conducted over 5, 10, and 15 years on covering insulated pipelines with hydrophobized soils howed that in samples of film coatings that were stored in hydrophobized soils, there lativeelongation was on average 20% higher, and the breaking strength was 15% higher, adhesion - by 10% compared to samples stored in ordinary mineral soils. The transient resistance of insulating coatings of pipe samples covered with hydrophobic oils changed significantly less than that of pipe samples covered with mineralized soil. Due to the improved physical and mechanical properties of hydrophobized soils, in particular, low values of permeability, filtration, water saturation, corrosion activity, swelling, high values of water resistance and adhesion, the transition resistance "pipe-soil" of insulated pipe samples decreasess lightly. It was established that the greatest effect in reducing the corrosion activity of soils (10 times) is observed at temperatures above 10-12oC, when the binder dosage is increased to 10%, and the refore on themostdangerousintermsofcorrosioninthe “hot” sections of the pipelines, for example NS and KS, to increase the reliability of operation, it is necessary to back fill pipelines with hydrophobic soils. As a result of the above experimental studies, a significant decrease in the corrosion activity of hydrophobized soils was established with an increase in the dosage of binders. The experiments, which were carried out according to three methods and according to the loss of mass of steel samples, specific electrical resistance and pole density of the cutting current, show edidentical results – the corrosion activity decreases from high to very low. According to the classification of regulatory documents. Field tests was α= 0.10 1/year, and for ordinary soils, according to regulatory documents, it is 0.125 1/year. Thus, the service life of the insulation increases by approximately 35-50% when the pipeline is sprinkled with hydrophobic soils.
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