Capacitance-type sensor used for horizontal well moisture percentage measurement
A technology of capacitive sensor and water cut, which is applied in wellbore/well parts, earthwork drilling and production, etc., to achieve the effects of high resolution, small pressure head loss and high measurement accuracy
Active Publication Date: 2011-06-29
DAQING OILFIELD CO LTD +1
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Problems solved by technology
[0007] In order to solve the problem that the existing interpolation type coaxial capacitance water cut measurement sensor has low resolution or even indistinguishability when measuring in low flow and high water cut horizontal wells, the present invention provides a water cut sensor specially used for horizontal wells Capacitive sensor for measurement, this kind of capacitive sensor is mainly for the flow rate of 100m 3 The water cut measurement of horizontal production wells within / d can have better resolution in the water cut range of 0-100%, which can be used to overcome and make up for the shortcomings of interpolated coaxial capacitance water cut measurement sensors
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[0020] The present invention will be further described below in conjunction with accompanying drawing:
[0021] The capacitive sensor used for water content measurement in horizontal wells described in the present invention, as shown in Figure 1, consists of an inner insulating cylinder 2 with a step, a metal inner cylinder 3, an outer insulating cylinder 4, a metal outer cylinder 1, and a retaining ring 5 and a pressure cap 6, wherein the inner insulating cylinder 2, the metal inner cylinder 3, the outer insulating cylinder 4, and the metal outer cylinder 1 are nested sequentially from inside to outside, and the metal inner cylinder 3 is located at the retaining ring 5, the inner insulation In the sealed insulating cavity formed after the cylinder 2 is connected with the outer insulation cylinder 4. In addition, after conducting the conductor connection on the metal inner cylinder 3, an electrode connection wire insulated from the metal outer cylinder 1 is sealed and drawn ou...
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The present invention provides a capacitive transducer for measuring the water content of a horizontal well, mainly solving the problem that the prior built-in coaxial capacitive transducer for measuring the water content has low resolution and even is unable to distinguish when measuring in low-flux and high water content horizontal well. The present invention is characterized in that the capacitive transducer includes an internal insulation barrel, a metal internal barrel, an external insulation barrel, a metal external barrel, a baffle ring and a pressure cap which are embedded from inside to the outside in order; the metal internal barrel is arranged in a sealed insulation cavity formed by connecting the baffle ring, the internal insulation barrel and the external insulation barrel; the upper part of the metal internal barrel is connected with a conductor and then sealed so as to lead out an electrical connecting wire insulated from the metal external barrel; a ground lead is also led out from the metal external barrel. The transducer aims at measuring the water content of the horizontal output well within the flux of 100m<3> / d, thus having an excellent resolution within the water content of 0-100 percents, overcoming and compensating the defects of the built-in coaxial capacitive transducer for measuring the water content.
Description
Technical field: [0001] The invention relates to an electrical component used for measuring the water content of a horizontal production well in an oil field, in particular to a capacitive sensor used for measuring the water content of a horizontal well. Background technique: [0002] At present, in oil wells with low production levels, the interpolation type coaxial capacitance water cut measurement sensor is mainly used to measure water cut, but at low flow rates, due to oil-water stratification, its resolution is often low, and the water cut is 50%. It is difficult to distinguish above. The reason for this analysis is that the sampling chamber of the interpolated coaxial capacitive water content measurement sensor applied to the capacitance method water holdup meter can be equivalent to a coaxial cylindrical capacitor, and the oil-gas-water mixture is the dielectric medium. At the same time, the capacitance of the coaxial capacitor changes accordingly, so the water holdi...
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IPC IPC(8): E21B49/08
Inventor 刘兴斌胡金海马水龙蔡兵李军徐文峰
Owner DAQING OILFIELD CO LTD