Underground oil- water two-phase flow rate measuring method used for low production liquid horizontal well

Abstract

The invention relates to an underground oil water two-phase flow rate measuring method used for low production liquid horizontal well. The invention mainly solves the problem that production liquid section dynamic monitoring actual requirement of low production liquid horizontal well can not be met in the existing production liquid section measuring method. The method is characterized in that: a round measurement pipe section with inner diameter D is horizontally arranged underground along fluid flowing direction, a cylindrical heat source generator capable of generating heat pulse is arranged at the axle center of the measurement pipe section, the downstream of the heat source generator is provided with two temperature sensor arrays with distance of L, mutual correlation arithmetical operation is carried out on upstream and downstream heat pulse temperature signals with time delay characteristic by an upper computer according to time domain mutual correlation algorithm, so as to obtain time of heat pulse fluid flowing through the two temperature sensor arrays and further obtain fluid flow rate, and then oil water two-phase flow Q is obtained. The invention has the characteristics that measurement effect is good in low production liquid well and is applicable to measurement in thick oil production well and injection polymer production well.

Description

Technical field: [0001] The invention relates to a method for downhole oil-water two-phase flow measurement in oil fields, in particular to a downhole oil-water two-phase flow measurement method mainly used in low-yield liquid horizontal wells. Background technique: [0002] In recent years, Daqing Oilfield has intensified the development of horizontal wells in peripheral oilfields. The development of horizontal wells in peripheral oilfields is characterized by generally low liquid production in oil wells, and the liquid production volume is less than 20m 3 The number of oil wells per day accounts for more than 80%, and the liquid production of some oil wells is even as low as 3-5m 3 / d. In this case, the traditional turbine flowmeter measurement method and the conductivity-related flowmeter measurement method are still used for flow measurement when performing horizontal well production profile logging. However, the following problems inevitably arise: when the flow rate ...

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Problems solved by technology

[0003] In order to solve the problem that the existing measurement methods can no longer meet the actual needs of dynamic monitoring of low liquid production horizontal wells in Daqing Peripheral Oilfields, the present invention provides a new downhole oil-water two-phase flow measurement method for low liquid production horizontal wells. After the method is implemented , can better meet the actual needs of dynamic monitoring of low-yield horizontal wells in peripheral oilfields of Daqing, and has the characteristics of good measurement effect and suitable for measurement in heavy oil production wells and polymer injection production wells.

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