Cleaning of Partially Prepared Oil from Hydrogen Sulfide with Nonregenerable Reagents
To bring the partially prepared oil to the requirements of standard GOST R 51858-02 on the content of hydrogen sulfide, it is treated with nonregenerable reagents. Were compared efficiency of the use of hydrogen sulfide neutralizers of grades DIN-11B, DIN-12 B and Darsan-N in partially prepared oil in the Company «Orenburgneft». Based on their physicochemical properties, these products meet the requirements established by the Public State Company «NK Rosneft». The effectiveness of the reagents was estimated by the flow rate, expressed in grams of neutralizer, necessary to join 1 gr of hydrogen sulfide. Since the content of hydrogen sulfide in the oil from one sample to another is a variable value, the most objective evaluation of the effectiveness of the neutralizers is considered the average flow coefficient, which is the arithmetic average between the minimum and maximum concentrations of hydrogen sulfide typical for this field of 134.9 and 207.8 ppm respectively. It is shown that the use of the mentioned non-regenerating reagents reduces the content of hydrogen sulfide in partially prepared oil. The characteristics of the results of its impact are the following. Reagent DIN-11 B has the lowest average consumption coefficient of 3.82 and shows the highest efficiency at low concentrations of hydrogen sulfide. The effectiveness of the Darsan-N neutralizer in low and high concentrations of hydrogen sulfide is the same: 4.55. The effectiveness of the neutralizer DIN-12 B is in an intermediate position between DIN-11B and Darsan-N. It is known that the interaction products of several neutralizers with hydrogen sulfide have a negative impact on the results of determining the content of chloride salts in oil partially prepared according to Standard GOST 21534-76 by the method «A». The content of chloride salts in oil partially prepared before and after treatment with hydrogen sulfide neutralizers, taken in excess, exceeding those used in production by 2.6 times, differs slightly from each other. Therefore, these hydrogen sulfide neutralizers can be recommended for wide application.