Nuclear magnetic resonance-based oil-water two-phase flow parameter measuring method
A technology of nuclear magnetic resonance and measurement method, which is applied in the direction of analysis, fluid velocity measurement, and measurement device using nuclear magnetic resonance, which can solve the problems of average flow rate and phase holdup measurement and calculation model error, long measurement time, etc.
Active Publication Date: 2019-06-07
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology
If the analysis of the influence of two-phase flow or multiphase flow parameters (flow velocity, phase holdup, etc.) and the calculation model has a large error
Existing literature mostly adopts solutions such as time-average scanning method or sufficiently long sampling period to improve the accuracy of multiphase flow parameter measurement. limitation
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[0052] The present invention is described in detail below in conjunction with accompanying drawing.
[0053] A kind of nuclear magnetic resonance oil-water two-phase flow parameter measurement and calculation method described in the present invention is divided into three steps, the first step is by analyzing the magnetization intensity vector and the FID signal received by nuclear magnetic resonance under different flow velocities and different water contents, optimize NMR system parameters, finally determine the magnetization length and detection coil length, and optimize the design of the NMR system parameters on the basis of fully considering the influence of the interaction of oil-water two-phase flow parameters; the second step is to analyze different flow rates and different water cuts The characteristics of the NMR received signal under the following conditions, and the normalized processing of the received signal of the oil-water two-phase flow NMR, so as to establish ...
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Abstract
The invention relates to a nuclear magnetic resonance-based oil-water two-phase flow parameter measuring method. According to the method, magnetization vectors and nuclear magnetic resonance receivedFID signals under different flow velocities and different water contents are analyzed, so that the parameters of a nuclear magnetic resonance system are optimized; magnetization length and detection coil length are determined; and the parameters of the nuclear magnetic resonance system are optimized with the influence of the interaction of oil-water two-phase flow parameters fully considered; thefeatures of the nuclear magnetic resonance received signals under the different flow velocities and different water contents are analyzed, and the oil-water two-phase flow nuclear magnetic resonance received signals are normalized, a water content measurement calculation model is established, and the accuracy of measurement is improved; and with the correlation of the parameters such as the different flow velocities and different water contents considered, an average flow velocity measurement and calculation model is established, so that the measurement of the average flow velocity of oil-water two-phase flow is realized. With the method of the invention adopted, more accurate measurement of the parameters of the oil-water two-phase flow can be realized.
Description
technical field [0001] The invention relates to the technical field of measuring oil-water two-phase flow parameters, in particular to a method for measuring nuclear magnetic resonance oil-water two-phase flow parameters. Background technique [0002] In the process of oil extraction, the produced fluid is mostly oil-water two-phase flow or oil-gas-water multiphase flow. Due to the insufficient grasp of the dynamic information of the oil and gas well produced fluid, it usually leads to early water breakthrough during the production process. , forced to shut down the entire oil and gas well, resulting in the shortened life of the oil and gas well and the decline in production, which seriously affected the economic benefits of the oil industry. Therefore, it is of great significance to study the parameter measurement and calculation methods of oil-gas-water multiphase flow or oil-water two-phase flow for optimizing the production of oil and gas wells, effectively protecting re...
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IPC IPC(8): G01N24/08G01P5/00G01P11/00
CPCY02A90/30
Inventor 李利品党博王小鑫党瑞荣
Owner XI'AN PETROLEUM UNIVERSITY