METHOD FOR EXTRACTING OIL, CONDENSATE AND HYDROCARBON GAS Russian patent published in 2023 - IPC E21B43/16 C10G5/00 E21B43/40 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to a method for extracting oil, condensate and hydrocarbon gas. The method includes at least two gas condensate fields with oil rims - depletable and highly productive - with different contents of hydrogen sulphide and carbon dioxide impurities in the produced hydrocarbon gas and being part of a single gas production and gas processing cluster. The method also includes injection of carbon dioxide into the formations of a gas-condensate field with oil rims and extraction of the gas-liquid mixture, followed by its separation into hydrocarbon gas and liquid. The method also includes purification of hydrogen sulphide and carbon dioxide impurities at the gas processing element of the cluster with the return of the separated carbon dioxide to the gas production element of the cluster. Depending on the ratio of carbon dioxide to hydrogen sulphide in the hydrocarbon gas being purified, extraction of these impurities from the gas of depleted and highly productive gas condensate fields with oil rims at the gas processing element of the cluster is carried out separately in one or two stages of absorption purification, followed by sending part of the resulting acid gases to a sulphur production plant. Gas from a highly productive gas condensate field with oil rims, in which the ratio of hydrogen sulphide to carbon dioxide is significantly more than 1:1, is sent to a selective amine hydrocarbon gas purification unit, where hydrogen sulphide with a permissible admixture of carbon dioxide is isolated and supplied to an elemental sulphur production unit. When the ratio of carbon dioxide to hydrogen sulphide is significantly more than 1:1, it is purified in two stages: at the first stage of absorption selective purification of gas enriched with carbon dioxide, maximum hydrogen sulphide and partially carbon dioxide are extracted in the ratio necessary for the efficient operation of the sulphur production unit. At the second stage of deep absorption gas purification, carbon dioxide is extracted, which is sent further to the gas production element of the cluster; excess carbon dioxide extracted from the gas during treatment is sent for compression to a pressure of 7.0-8.0 MPa and condensed for subsequent transport in a liquid form to depleted and highly productive gas condensate fields with oil rims, in the range from 0 to 100% of the total volume of carbon dioxide production, maintaining the deviation of the increase in carbon dioxide from the natural content in the developed fields at a level of no more than 20%, within the limits acceptable for the absorption process of the first and second stage.

EFFECT: establishing connections between the producing and the processing elements of a single cluster, its functioning under dynamic conditions of changes in the composition of the produced hydrocarbon gas and different productivity of the fields included in the cluster, as well as an increase in the yield of marketable products.

4 cl, 1 dwg