Shaft flow monitoring system and flow and water content interpretation method

Abstract

The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a shaft flow monitoring system and a flow and water content interpretation method. According to the shaft flow monitoring system, distributed optical fiber temperature monitoring, distributed optical fiber sound wave monitoring and single-point thermal excitation functions are integrated, simultaneous monitoring of multiple parameters of underground temperature and sound waves is achieved, and the requirement for real-time monitoring of the underground fluid state in the high-temperature, high-pressure and corrosive environment is met. The invention further discloses a flow and water content interpretation method. Particularly for oil-water-gas three-phase fluid of an oil well, multi-parameter fusion interpretation is carried out on temperature information and sound wave information after fluid pulse heating, the flow and water content conditions are interpreted from multiple angles, the purposes of mutual verification and multiplicity reduction are achieved, the obtained fluid flow, the water content and the gas content are more accurate, more accurate data support is provided for actual production, the exploitation cost is saved, and the exploitation risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a wellbore flow monitoring system and a flow and water cut interpretation method. Background technique [0002] At present, most oilfields in China mainly use turbine flowmeters and related flowmeters to measure the flow rate of horizontal wells. For some horizontal wells with severe sand content and low fluid production, turbine flowmeters are prone to sand stuck, lost rotation, etc. The phenomenon of even stalling will affect the measurement accuracy and measurement stability. Chinese patent document CN104089664B discloses a thermal pulse time-difference type oil-water two-phase flow measurement sensor, which can be used for dynamic monitoring of fluid production profile flow in low fluid production horizontal wells. However, the fluid state during oil pumping is not only water-oil two-phase. When the wellbore is subjected to gas invasion, the gas c...

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Problems solved by technology

[0002] At present, most oilfields in China mainly use turbine flowmeters and related flowmeters to measure the flow rate of horizontal wells. For some horizontal wells with severe sand content and low fluid production, turbine flowmeters are prone to sand stuck, lost rotation, etc. The phenomenon of even stalling will affect the measurement accuracy and measurement stability. Chinese patent document CN104089664B discloses a thermal pulse time-difference type oil-water two-phase flow measurement sensor, which can be used for dynamic monitoring of fluid production profile flow in low fluid production horizontal wells

However, the fluid state during oil pumping is not only water-oil two-phase. When the wellbore is subjected to gas invasion, the gas content will affect the measurement of water cut, resulting in the possibility of multiple solutions for water cut and fluid flow measurement. If gas is contained, the monitoring will not be effective. In time, there is also the risk of a blowout

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