FIELD: oil and gas industry.
SUBSTANCE: industry of a single technical-and-economic regional cluster. A method of extraction of oil, condensates and high molecular compounds is implemented in the complex comprising at least two gas-condensate fields with oil banks. The first field is close to be depleted, and the second one is high-yielding. The fields differ by content of hydrogen sulphide and carbon dioxide impurities in the produced hydrocarbon gas. The process is performed by injection into the reservoir of gas condensate fields with oil rims of carbon dioxide and extraction of gas-liquid mixture. The carbon dioxide for injection into the reservoir of the first field iatn the initial stage is produced from extracted second hydrocarbon gas with a larger amount of carbon dioxide. The ratio of hydrogen sulfide and carbon dioxide impurities in the recovered hydrocarbon gas for the first and the second fields are (2.4): 1 and 1: 1 respectively. At the initial stage the gas treatment is performed at the first field with one stage with simultaneous deep extraction of hydrogen sulfide and carbon dioxide. As the impurities ratio gets closer to 1: 1 two treatment stages - selective and deep - are performed. Purification of the produced gas of the second field is continuously performed in two stages. The recovered carbon dioxide is pumped to the compression down to the pressure 7.0-8.0 MPa for further transportation in liquid form to the first field. Injection is performed into injection wells located on hydrocarbon production sites. The recovered gas, condensate from production wells, including retrograde one, and high molecular compounds are separated into gas and liquid phases. The gas phase is transported to gas processing plants, and liquid phase - to refineries of the single cluster.
EFFECT: invention improves the efficiency of extraction of hydrocarbon from the fields depleted by forming links between production and processing elements of the cluster to ensure its functioning in conditions of dynamic changes in composition of produced hydrocarbon gas and productivity of fields.
6 cl, 1 dwg
