Methanol Delivery Recycle Systems Development at Complex Gas Treatment Unit of Achimov Deposits of Urengoyskoe Oil and Gas-Condensate Field

Abstract

When developing hydrocarbon deposits, an important task is the development and implementation of energy- and resource-saving technologies. Prospects for the development of Gazprom dobycha Urengoy are associated with the commissioning of deposits of the Achimov stratum. For the preparation of gas from these deposits, the design solutions include the use of low-temperature separation units with a recirculation scheme for the use of methanol. The article describes the development and implementation of technical solutions on improvement of recirculation schemes of the use of methanol in the Achimov gas fields. The design solutions on optimization of methanol consumption at the gas treatment plant of the area 2A of the Urengoy field were not fully realized because of the hydrate deposition when feeding liquid from the intermediate separation stage to the low-temperature stage. The analysis of methanol distribution between the outgoing streams of the complex gas treatment plant showed that the main methanol losses occur with unstable condensate. Specialists of Gazprom dobycha Urengoy LLC developed two technical solutions aimed at reducing methanol consumption. The first solution involves feeding the liquid phase from the intermediate separation stage to the low-temperature stage by means of an ejector. The second solution is based on the aqueous extraction of the reagent from the condensate with a mixture of formation water and the aqueous phase after methanol utilization in the stripping column. The implementation of these technical solutions makes it possible to reduce methanol consumption in gas treatment plants by about twice. A list of activities on improving the recirculation technology of the use of methanol in Achimov gas treatment plants has been determined. The first technical solution has already been implemented in the gas treatment plant of the area 2A and has proved its effectiveness