Device for improving water holding rate measurement precision of low-yield high-water-cut oil well

Abstract

The invention discloses a device for improving the water holding rate measurement precision of a low-yield high-water-cut oil well. The device comprises a halter, a casing coupling logging nipple, a telemetering circuit nipple, a natural gamma logging nipple, a quartz pressure logging nipple, a water holding rate meter, an oil-water ultrasonic emulsification nipple, a current collection turbine flowmeter, a current collection umbrella and a temperature measurement nipple which are sequentially connected; and the oil-water ultrasonic emulsification nipple comprises an upper logging nipple connection joint, an oil-water ultrasonic emulsification nipple pipe and a lower logging nipple connection joint which are sequentially connected, and a first ultrasonic transducer and a second ultrasonictransducer are arranged at the upper end and the lower end on the inner wall of the oil-water ultrasonic emulsification nipple pipe correspondingly. The device is used for measuring the water holdingrate under the condition of underground low-flow and high-water-cut oil-water two-phase flow, so that the mixed fluid is changed from a semi-uniform mixed state to an emulsified state, and the water is destroyed to be a continuous phase state, so that the detection precision of the water holding rate meter based on the electrical property as a physical basis is greatly improved.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a device for improving the measurement accuracy of water holdup of low-yield and high-water-cut oil wells. Background technique [0002] At present, most of the domestic oil fields have entered the middle and late stage of development, the single well production of oil wells is extremely low, and the comprehensive water production rate is more than 80%. In the case of extremely low fluid production flow and high water cut in oil wells, the conventional combined seven-parameter production profile logging instrument has been unable to meet the technical requirements of downhole fluid monitoring. In order to accurately obtain data on the production capacity of low-production wells (layers), a collector umbrella is added to the conventional seven-parameter logging tool to form a combined collector umbrella-type seven-parameter liquid production profile logging series. ...

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Problems solved by technology

[0004] In a vertical well, due to the density difference between the oil-water two-phase medium, there is a slippage effect between the oil phase and the water phase, and due to the existence of the slippage effect, the light phase oil flows concentratedly in the center of the pipe diameter, resulting in multiphase The distribution of fluid in the wellbore is extremely uneven

Although the collecting umbrella and the turbine flowmeter will have a certain mixing effect on the fluid, it cannot ensure that the oil-water two-phase fluid is evenly mixed in the collecting channel

However, due to the extremely small detection range of the method of measuring water holdup by using the electrical properties of the fluid, the measurement conclusion of the electrical detection probe installed in the collecting channel still has a certain deviation from the real situation, and under high water content conditions, when there is When the formation water with high salinity is the continuous phase medium, the electrical holdup detection probe will fail

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