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With the continuous production of new oil wells containing H2S associated gas in Tahe Oilfield in recent years, the crude oil produced from the original sulfur-free to sulphur exceeds the standard by more than two times (the sulfur content of exported crude oil should be less than 20mg/kg, At present, it is 48.47mg/kg), which has brought great difficulties to the export of crude oil. The only way to solve the current desulfurization is to add desulfurizer to crude oil. This method is not only expensive, but also the newly generated sulphides make the quality of crude oil drop, directly affecting the export prices of crude oil and the economic benefits of the oil field.
In order to completely solve the problem of restricting the export of crude oil, the branch decided to set up a new dry gas sulfur extraction process in Tassan, which uses the dry gas generated by the light hydrocarbon plant at the station to desulfurize the crude oil. The process mainly includes flat-flow double-flow screen desulfurization towers, air condensers and vertical gravity separators. The height of 25.8 meters and the weight of 37 tons of desulfurization towers are divided into upper and lower parts, and the first half of crude oil in the second half. After the secondary desulfurization treatment, the upper part of the tower is re-entered for secondary desulfurization. After the completion of the process, the crude oil treatment has achieved satisfactory results, and its sulfur content has dropped below 20mg/kg, which is in full compliance with the quality standards for export crude oil.
The process is expected to be fully promoted in Tahe Oilfield's towers and towers in the next year.
On December 30, 2008, the first set of dry gas sulfur removal technology built by Shengli Oil Construction Company was successfully built in Tasang and successfully completed on December 30, 2008, from January 4, 2009. By the end of the 9th, the trial operation of the sub-system was successful. The desulfurization of the crude oil completely complied with the design requirements and the export standards.