Combined sensor applied to measurement of water ratio in oil well

Abstract

The invention discloses a combined sensor applied to measurement of a water ratio in an oil well and mainly solves the problem that the measurement resolution of common sensors for the water ratio is reduced under the condition of low-flow oil-water stratified flows in the prior art. The combined sensor applied to the measurement of the water ratio in the oil well is characterized in that: an electrode rod of a coaxial capacitance sensor is embedded at the central position of a tubular capacitance sensor; the electrode rod consists of an inserted electrode bar and an insulating layer coated outside thereof; the inserted electrode bar in the electrode rod is connected in parallel with a metal tubular electrode; the two electrodes are subjected to sealing treatment to insulate from a shell, and leads of the two electrodes are led out to connect the same exciter in a parallel connection mode on a circuit; and the metal shell serves as a grounding terminal. Compared with the conventional tubular sensors and coaxial capacitance measurement sensors, the combined sensor has wider response range when the oil water stratified flows flow in the sensor; under the condition of no stratified flows, the structure of the combined sensor increases an effective area in contact with oil bubbles, and limits the range of activity of the oil bubbles, thereby improving the measurement resolution.

Description

Technical field: [0001] The invention relates to a device used in horizontal well testing in an oil field, in particular to a sensor device with relatively high resolution applied to a well logging instrument in the case of low-flow oil-water layering. Background technique: [0002] With the number of horizontal wells in Daqing Oilfield increasing year by year, the production logging of horizontal wells is becoming more and more urgent. The development of horizontal wells with high capacity cannot meet the requirements of horizontal well testing in Daqing Oilfield. Therefore, it is necessary for scientific and technical personnel to carry out creative thinking to solve the production logging problems of horizontal wells for mechanized production wells. In the prior art, the coaxial capacitive water cut measurement sensor matched with the logging instrument is mainly used to measure the water cut, but with the emergence of more and more low production level oil wells, this tr...

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Problems solved by technology

[0003] In order to solve the problem in the prior art that there is no sensor with good water cut measurement resolution that can be used in conjunction with logging instruments in the case of low flow oil-water layers, the present invention provides a sensor for oil well water cut measurement Combined sensor, compared with the existing cylindrical sensor and coaxial capacitance measurement sensor, this kind of combined sensor used in oil well water cut measurement increases the response range of the sensor when the oil-water layer flows in the sensor; Under laminar flow, this structure increases the effective area in contact with the oil bubble, limits the range of movement of the oil bubble, increases the probability of oil bubble adhesion, and thus improves the measurement resolution

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