Analyzer for analyzing moisture in ground conductance

An analyzer and conductivity technology, applied in the direction of material impedance, material resistance, etc., can solve the problems of easy scaling, existence safety, and high price, and achieve the effect of no interference in flow, small repeatability error, and low cost

Inactive Publication Date: 2005-03-30
DAQING OILFIELD CO LTD
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Problems solved by technology

The capacitive water-cut analyzer is suitable for the case where the oil is a continuous phase, and its accuracy is low when the water content is high, so it is rarely used at present; the radioactive density meter has reliable performance, but is expensive and has potential safety hazards; the vibration tube density m...

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  • Analyzer for analyzing moisture in ground conductance
  • Analyzer for analyzing moisture in ground conductance
  • Analyzer for analyzing moisture in ground conductance

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] First, the technical inspiration of the present invention is as follows: if there is a sensor composed of stainless steel electrodes embedded in the inner wall of an insulating pipe, when the liquid to be measured flows through the sensor, although the electrodes are in contact with the liquid to be measured, it does not interfere with the flow. When the fluid flows through the sensor, power is supplied to the sensor. Due to the existence of the fluid impedance between the electrodes, according to the electrical principle, the amplitude of the voltage generated between the electrodes is inversely proportional to the conductivity of the fluid flowing through the sensor. Let the miscible conductivity of the fluid flowing through the sensor be σ m , the conductivity of the water phase is σ w , when the phase is mixed, the voltage between the electrodes is measured...

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Abstract

The invention relates to a ground condcutive water cut analyzer for measuring water cut in oilfield export liquor. It is characterized by that the described analyzer includes an electric conductance sensor, excitation source generation circuit, voltage differential signal detection and voltage/frequency signal covnersion circuit. The described electric conductance sensor is formed from insulating tube, ring excitation, electrode mounted on the inner wall of insulating tube and ring measurnig electrode. Under the action of excitationsource generation circuit the excitation electrode can provide alternating current with constant magneitude, and under the action of voltage/frequency converter the pressure-different signal inputted by measuring electrode can be converted into frequency signal and outputted, then passed through power amplifier and transferred into secondary meter. Its measurement accuracy is high, repeatability and good consistency.

Description

Technical field: [0001] The invention relates to a primary instrument used in the field of oilfield metering, in particular to a conductivity-type water content analyzer used for measuring the water content of crude oil in external infusions of various transfer stations in oil extraction plants. Background technique: [0002] Water cut measurement is a key link in oilfield surface measurement. In the high water cut stage of oilfield development, a metering device that can accurately and reliably measure water cut is urgently needed. At present, the water content measurement instruments of oil-water two-phase flow include capacitive water content analyzer, vibrating tube density meter and radioactive density meter. Capacitance water content analyzer is suitable for the case where the oil is a continuous phase, and the accuracy is low when the water content is high, and it is rarely used at present; the radio density meter has reliable performance, but it is expensive and has...

Claims

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Application Information

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IPC IPC(8): G01N27/02G01N27/12
Inventor 刘兴斌袁智蕙庄海军刘纯张新红鞠明渊
Owner DAQING OILFIELD CO LTD
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