A device and method for measuring downhole fluid production profile flow and water holdup
A technology of liquid production profile and water holdup, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve problems such as failure, sensitivity drop, and inability to accurately measure the water holdup, so as to reduce the impact, Effects of avoiding failure and improving measurement sensitivity
Inactive Publication Date: 2015-08-05
XI AN JIAOTONG UNIV
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Problems solved by technology
However, in the case of high water content exceeding 50%, the sensitivity of traditional capacitive sensors is greatly reduced, or even completely invalidated, resulting in the inability to accurately measure the water holding rate
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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0032] refer to figure 1 , a device for measuring the flow rate and water holdup of the downhole liquid production section, including a motor and a reducer unit 1, the motor and reducer unit 1 are connected through a transmission shaft 2 and a coupling 3, and the coupling 3 is connected to the umbrella cup 5 connection, the upper end of the transmission shaft 2 is fixed with the wire-passing plate 6, the wire-passing plate 6 is fixed on the collector frame 4, and the collector frame 4 is fixed with the current-collecting umbrella 7, and the upper part of the current-collecting umbrella 7 is sequentially from bottom to top A turbine flowmeter 8, a capacitance sensor 9, a temperature and pressure sensor 10 and a tap 11 are provided.
[0033] refer to figure 2, the header 4 is connected with the upper pressure pipe 15, the upper pressure pipe 15 and t...
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The invention provides a device and a method for measuring downhole liquid production profile flow and water holding capacity. A motor is connected with a reducer unit through a transmission shaft and a coupler, the coupler is connected with an umbrella closing cup, the upper end of the transmission shaft is fixed through a wire passing plate which is fixed on a flow collection frame, a flow collection umbrella is fixed on the flow collection frame, and a turbine flowmeter, a capacitance sensor, a temperature pressure sensor and a halter are arranged on the upper portion of the flow collection umbrella from bottom to top in sequence. A gap exists between the flow collection umbrella and a sleeve in a well, a flow-split type flow measuring method is used, and a liquid production amount value measured by the turbine flowmeter divides a flow-split coefficient to obtain liquid production amount. The loss caused by untight attachment of the flow collection umbrella and a sleeve tube and the like in a conventional method is avoided, and precision is improved. The capacitance sensor is used for measuring water holding capacity, water in oil-water two-phase flow which contacts insulative dielectric substance materials and an outer shell of the capacitance shell is used as a cathode of the capacitance sensor, sensor structure is simplified, susceptibility is improved, and measuring range of water holding capacity can be 0-100%.
Description
technical field [0001] The invention relates to the technical field of downhole measurement, in particular to a device and method for measuring downhole fluid production profile flow and water holdup. Background technique [0002] At present, there are many types of instruments for measuring the production and water holdup of oil well fluid production profiles, and the most widely used instrument is the water collecting instrument that goes down the well through the annular space. It is mainly composed of three parts: collecting umbrella, flow meter and water holdup meter. [0003] The function of the collecting umbrella is to close the annular space between the instrument and the casing, so that the fluid in the casing can flow through the collecting channel as much as possible. This current collecting and logging method, on the one hand, can increase the flow velocity flowing through the turbine flowmeter, on the other hand, it can maintain the stability of the flow state...
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IPC IPC(8): E21B49/08
Inventor 王帅王栋王凯欧舟张兴凯张炳东刘明吴国伟
Owner XI AN JIAOTONG UNIV