Abstract
In order to realize array measurement of water holdup on oil well section, a capacitance-based sensor with planar inter-digital structure is proposed, an integrated detecting module is designed, which converts the measured capacitance value to periodic signal with corresponding frequency, a circuit which extracts signal from current change of power supply is developed. The experimental result shows the above solution has advantages to minimize size sensor, less connections between sensor and circuit boards, strong anti-interference performance and high definition when water holdup is not above 50%, thereby, it has important reference value for developing array capacitance-based log tool for water holdup measurement.
Highlights
Water holdup of oil well is an important parameter for the decision of crude oil production
The common detection method used in vertical wells such as capacitive method by dint of catchment umbrella cannot accurately reflect the water holdup information of horizontal wells and high angle deviated wells
In order to realize array detection of water holdup with capacitive method, there are two basic problems must to be solved: (1) Miniaturized the capacitive sensor structure to forming sensor arrays and arrange multiple detection points on the cross section of the oil well; (2) Reducing the influence of the distributed capacitance between the sensor and the detection circuit on the measurement results and channel consistency After analyzing existing domestic and foreign capacitive water holdup tools' design schemes, this paper presents the interdigital capacitive water holdup sensor structure [4], and designs an indirect measurement scheme Based on the conversion between capacitance and frequency
Summary
Water holdup of oil well is an important parameter for the decision of crude oil production. Xu Wenfeng [1] team has designed a cylindrical capacitance sensor for measuring the water holdup of oil-water tow-phase flow in horizontal wells. Zhao Xiaoqiang [2] team used the same capacitance sensor structure, designed the water holdup measuring instrument be used in gas-water tow-phase flow for horizontal well. Both sensors place tubular capacitors horizontally in horizontal well. According to the in-line detection requirements for water holdup of crude oil, in order to obtain the distributing information of water holdup on the cross profile of the oil well, the sensors are required to arrange in an array distributing structure on cross profile of oil wells. In order to realize array detection of water holdup with capacitive method, there are two basic problems must to be solved: (1) Miniaturized the capacitive sensor structure to forming sensor arrays and arrange multiple detection points on the cross section of the oil well; (2) Reducing the influence of the distributed capacitance between the sensor and the detection circuit on the measurement results and channel consistency After analyzing existing domestic and foreign capacitive water holdup tools' design schemes, this paper presents the interdigital capacitive water holdup sensor structure [4], and designs an indirect measurement scheme Based on the conversion between capacitance and frequency
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