Removal of hydrogen sulfide from crude oil in Oil and Gas Production Department Leninogorskneft’s oil production facilities

UDK: 622.276.8:665.622

DOI: 10.24887/0028-2448-2020-7-64-67

Key words: chemical agent, oil, hydrogen sulfide, scavenger, column, stripping

Authors: Yu.G.Volkov (Oil and Gas Production Department Leninogorskneft, RF, Leninogorsk), D.D. Shipilov (TatNIPIneft, RF, Bugulma)

Desorption columns for hydrogen sulfide removal from crude oil by stripping with the hydrocarbon gas were tested in the two Tatneft PJSC high-sulfur oil treatment plants, the Kuakbash and the Kama-Ismagilovo. This paper presents findings from the tests, challenges of the new technological approaches and the solutions. To address the problem of forming of a large amount of condensate and gas in condensate tanks (drips), recirculation and orificing technologies were used. The objective of this work was to raise the quality of stock-tank oil as regards the residual H2S content to meet the requirements of standard GOST R 51858-2002 in the most cost-efficient way. Chemical H2S scrubbing techniques that have been used in the Oil and Gas Production Department Leninogorskneft oil production facilities are rather costly and still do not allow to meet the state standards (GOST) requirements. It has been found that stripping high-sulfur oil with the Devonian hydrocarbon gas in the desorption column was the most effective way to remove H2S from crude oil in the Kuakbash and Kama-Ismagilovo oil treatment plants. However, increase of pressure in the column worsened the quality of crude oil treatment, caused dilution of lubricating oil in the compressor, and led to forming of a large amount of condensate from the stripping gas in drips. To solve these problems, the second stage of separation was introduced in the Kuakbash oil treatment plant, an air cooler was included in the crude oil treatment system to decrease gas temperature downstream of the column and slow down condensing of heavy hydrocarbons upstream of the compressor station; gas recirculation and gas orificing technologies were realized in the Kama-Ismagilovo and the Kuakbash oil treatment plants, respectively, to minimize (exclude) condensate forming in drips of pressure pipelines. These technological solutions made it possible to improve the quality of the stock-tank oil to comply with the GOST requirements. References 1. Ibragimov N.G., Sakhabutdinov R.Z., Shatalov A.N. et al., Hydrogen sulfide removal from oil at tatneft assets (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 7, pp. 58–61. 2. Sakhabutdinov R.Z., Shatalov A.N., Garifullin R.M. et al., Technologies of an oil cleaning from hydrogen sulphide (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2008, no. 7, pp. 82–85. 3. Sakhabutdinov R.Z., Shatalov A.N., Garifullin R.M. et al., Analyzing efficiency of chemical neutralization of hydrogen sulphide in oil (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009, no. 7, pp. 66–69. 4. Ibragimov N.G., Shipilov D.D., Mingazova A.Z. et al., Application of hydrogen sulfide scavengers for oil treating at crude oil treatment facilities of Tatneft OAO (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 7, pp. 52–54. 5. Anufriev A.A., Shatalov A.N., Shipilov D.D., Garifullin R.M., Technology of processing of h 2s-containing oil and petroleum gas at kuakbashsky central production facility (In Russ.), Oborudovanie i tekhnologii dlya neftegazovogo kompleksa, 2014, no. 6, pp. 40–43.