Method and system for calculating virtual flow of underwater acquisition system of offshore gas field group

Abstract

The invention provides a method and system for calculating the virtual flow of an underwater acquisition system of an offshore gas field group. The method includes the steps that operating data of at least two gas wells in the gas field group are acquired; the operating data are filtered, and the coefficient of dispersion of the operating data is acquired; a flow control equation is established according to a multi-phase flow physical transportation rule, the flow serves as an unknown value, and the flow control equation is converted into a flow calculation model; when the coefficient of dispersion of the operating data is higher than a preset threshold value, flow data of all the gas wells in the operating data are calculated through the flow calculation model; and when the difference between the total flow value of the flow data of all the gas wells and a measured flow value is smaller than a preset threshold value, yield data of the to-be-measured gas wells are acquired by calculation through the flow calculation model.

Description

technical field [0001] The invention relates to the field of offshore oil and gas acquisition, in particular to a virtual flow calculation method and system for an underwater acquisition system of an offshore gas field group. Background technique [0002] The underwater acquisition system is one of the new technologies in the development of offshore gas fields. It is characterized by the multi-well acquisition function. It collects the underwater wellhead logistics in the block and gas fields and then transports them to the water surface facilities for processing. Part or All platform production systems are transferred underwater to form an underwater production system. This production method can simplify the process flow, reduce the number of pipelines, facilitate the replacement of old and new wells, be suitable for the development of marginal gas fields and deep-water gas fields, and have high overall technical requirements. At present, great progress has been made in the...

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Problems solved by technology

my country was the first to jointly introduce this technology in the development of the Yacheng 13-1 deep-water gas field in the South China Sea. In 2015, the first virtual metering system independently developed by my country was successfully applied in the LH19-5 gas field in the South China Sea. The flow prediction function of no more than two wells in the block needs to rely on the artificial setting of the flow weighting factor to better realize the prediction of the single well flow rate. The multi-well virtual flowmeter technology and application of the underwater acquisition system of offshore gas fields have not yet been realized.

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