Wellhead oil-gas-water three-phase flow static moisture content measuring system and control method thereof

Abstract

The invention discloses a wellhead oil-gas-water three-phase flow static moisture content measuring system and a control method thereof, and relates to the technical field of oil production logging. The measuring system mainly comprises a wellhead oil-gas-water three-phase flow static moisture content measuring device and a signal processing sub-system; fluid in the wellhead oil-gas-water three-phase flow static moisture content measuring device flows or keeps motionless by a on-off control valve group; gas-liquid separation is carried out through a gas-liquid separation tank; moisture contentof the fluid is calculated through a capacitance level gauge; pressure monitoring and early warning for decompression are carried out through an electronic valve and a pressure gauge; and the signalprocessing sub-system comprises a wellhead signal processing circuit, a base station and a computer and is used for collecting, transmitting and analyzing moisture content signals and remote control.The system has advantage of simple structure, high measuring precision, low manufacturing and maintaining costs, being installed in a large scale and the like.

Description

technical field [0001] The invention relates to the technical field of oil production logging, in particular to a wellhead oil-gas-water three-phase flow static water cut measurement system and a control method thereof. Background technique [0002] At present, major oilfields have entered the mid-to-late stage of development. In order to improve recovery, water injection and gas injection flooding technologies are widely used in major oilfields. Gas-liquid, oil-water and oil-gas-water multiphase flows are very common. The water content of crude oil directly affects the extraction, dehydration, gathering and transportation, metering, sales, refining, etc. of crude oil. In the process of crude oil production, storage and transportation, it is necessary to detect the water content of crude oil. The on-line measurement of crude oil water content is of great significance for determining the water output of oil wells, estimating crude oil production, and predicting oil well life....

AI Technical Summary

Problems solved by technology

The measurement principle of the density meter method is simple and the equipment cost is low, but the impurities in the fluid are likely to reduce its measurement accuracy and life; the gamma ray method has complex measurement and correction, high cost, and ray radiation; the capacitance method has simple equipment and low price. However, the measuring range is short, and it is only suitable for oil wells with water cut below 30%; the conductivity method has a simple structure and low cost, but it is only suitable for oil wells where water is the continuous phase (high water cut); the radio frequency method has high precision, fast response, and small volume , but the measurement range is narrow; the microwave method has a wide measurement range, but the technical cost is high and maintenance is difficult

[0004] In order to solve the problems that the current oil well water cut detection single sensor cannot take into account the measurement range, measurement accuracy, technical cost, reliability, etc., someone proposed a multi-sensor combination measurement solution, such as the combination of conductance and capacitance, which can effectively expand the measurement range and reduce the technical cost. And it has the advantages of simple equipment and good reliability, but the measurement accuracy of the conductivity sensor is positively correlated with the fluid velocity and water content, while the capacitance sensor is just the opposite. Therefore, the capacitance-conductivity combination sensor has poor accuracy in dynamic measurement

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