Abstract
This paper studied conductance-based method for water cut measurement to dynamically monitor the horizontal oil-producing wells. Existing conductance tools cannot obtain the response values corresponding to the water phase in horizontal wells due to the characteristics of the ring-shaped electrode structure and the horizontal well structure. In order to tackle this issue, this paper designed a novel Combined Conductance Sensor (CCS), which mainly consists of the Ring-Shaped Conductance Probe (RSCP) and the novel Clock-like Conductance Probe Array (CCPA). Specifically, we first established the structure model of CCS, optimized the geometry of CCPA by analyzing the uniformity of electric field distribution generated by the exciting electrodes of CCPA and then analyzed the local sensitivity field region of the optimized CCPA. Then we studied the flow pattern distribution of the horizontal oil-water two-phase flow and analyzed the response characteristics and the linear relation between RSCP and CCPA. In addition, this research developed the CCS-based tool and conducted the experiments about different inclined angles in horizontal and slightly inclined pipes. Extensive experiments demonstrated that the developed CCS can cover the three-quarter scale of water cut measurement(25%-100%) in horizontal and slightly inclined pipes, and the experimental results verified the validity of CCS for the water cut measurement. Comparing to the existing methods, the proposed CCS is more suitable for water cut measurement with the advantages of simple structure and low cost for the horizontal oil wells with the characteristics of the low production, which could be used widely in the actual logging.
Highlights
Horizontal well technology, as the effective and yield-improving production logging technology comparing to vertical wells, is significantly important for improving the single-well production and oil recovery
When the horizontal well sections exists a certain inclined angle, the flow pattern is different at different axial locations in measurement pipe, and the working position of the logging instrument after the axial rotations cannot be determined when the instrument is placed in the horizontal logging section, and in the above situations, the measurement accuracy of obtaining response value corresponding to the water phase by the sensor is reduced and the actual requirements would be not satisfied
According to the above issues, taking into account the actual situation of horizontal wells with low yield, this paper proposed the collecting-type Conductance Sensor (CCS) including the spatial measurement and local measurement: among it, the spatial measurement part utilizes the Ring-Shaped Conductance Probe (RSCP) for measuring the spatial information of the measurement pipe; the local measurement part is designed as the novel Conductance Probe Array (CCPA) for measuring the fluid information in different cross-section places of the measurement pipe
Summary
Horizontal well technology, as the effective and yield-improving production logging technology comparing to vertical wells, is significantly important for improving the single-well production and oil recovery. W. Kong et al.: Novel CCS for Water Cut Measurement of Low-Velocity Oil-Water Flow in Horizontal and Slightly Inclined Pipes TABLE 1. When the horizontal well sections exists a certain inclined angle, the flow pattern is different at different axial locations in measurement pipe, and the working position of the logging instrument after the axial rotations cannot be determined when the instrument is placed in the horizontal logging section, and in the above situations, the measurement accuracy of obtaining response value corresponding to the water phase by the sensor is reduced and the actual requirements would be not satisfied. According to the above issues, taking into account the actual situation of horizontal wells with low yield, this paper proposed the collecting-type CCS including the spatial measurement and local measurement: among it, the spatial measurement part utilizes the RSCP for measuring the spatial information of the measurement pipe; the local measurement part is designed as the novel CCPA for measuring the fluid information in different cross-section places of the measurement pipe.
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