阅读说明：本技术 一种原油含水率超声检测方法及使用该方法的检测仪 (Ultrasonic detection method for water content of crude oil and detector using same ) 是由 吴叶军 刘彩艳 于 2019-10-15 设计创作，主要内容包括：本发明公开了一种原油含水率超声检测方法及使用该方法的检测仪,检测仪包括超声发射探头、超声接收探头、连接所述超声发射探头的激发模块、连接所述超声接收探头的处理模块,所述激发模块受控于所述处理模块,所述激发模块和所述处理模块设置于表头中,所述超声发射探头和所述超声接收探头从所述表头下方两侧伸出,检测时,所述超声发射探头和所述超声接收探头浸没在原油中；所述处理模块内置线性标定单元和线性运算单元。本发明采用了不同于以往的分析路径,避开了繁多又复杂的过程分析,直接从结果入手,给出了原理简单、使用方便、检测精度高的原油含水率超声检测仪实用方案。(The invention discloses an ultrasonic detection method for water content of crude oil and a detector using the method, wherein the detector comprises an ultrasonic transmitting probe, an ultrasonic receiving probe, an excitation module connected with the ultrasonic transmitting probe and a processing module connected with the ultrasonic receiving probe, the excitation module is controlled by the processing module, the excitation module and the processing module are arranged in a gauge outfit, the ultrasonic transmitting probe and the ultrasonic receiving probe extend out from two sides below the gauge outfit, and the ultrasonic transmitting probe and the ultrasonic receiving probe are immersed in the crude oil during detection; the processing module is internally provided with a linear calibration unit and a linear operation unit. The invention adopts the analysis path different from the prior art, avoids the analysis of various and complicated processes, directly starts with the result, and provides the practical scheme of the ultrasonic detector for the water content of the crude oil with simple principle, convenient use and high detection precision.)

1. An ultrasonic detection method for the water content of crude oil is characterized in that a linear function is used for representing the relation between two variables of the water content of the crude oil and an ultrasonic time difference, wherein the ultrasonic time difference refers to the time difference between the ultrasonic signal sent by an ultrasonic transmitting probe and the ultrasonic signal received by an ultrasonic receiving probe; and then obtaining the water content of the crude oil according to the linear function relationship between the water content of the crude oil and the ultrasonic time difference and the actually measured ultrasonic time difference.

2. The ultrasonic detector for the water content of crude oil is characterized by comprising an ultrasonic transmitting probe, an ultrasonic receiving probe, an excitation module connected with the ultrasonic transmitting probe and a processing module connected with the ultrasonic receiving probe, wherein the excitation module is controlled by the processing module, the excitation module and the processing module are arranged in a meter head, the ultrasonic transmitting probe and the ultrasonic receiving probe extend out from two sides below the meter head, and during detection, the ultrasonic transmitting probe and the ultrasonic receiving probe are immersed in the crude oil;

the processing module is internally provided with a linear calibration unit and a linear operation unit; the linear calibration unit is used for carrying out linear calibration on the water content of the crude oil and the ultrasonic time difference according to the crude oil sampling data of the oil field to form a linear function relation between the water content of the crude oil and the ultrasonic time difference; and the linear operation unit obtains the water content of the crude oil according to the linear function relation between the water content of the crude oil and the ultrasonic time difference and the actually-measured ultrasonic time difference.

3. The ultrasonic detector for water content in crude oil according to claim 1, characterized in that the detector testing section is arranged in a constant temperature box.

4. The ultrasonic detector of the water content in crude oil of claim 3, wherein the ultrasonic transmitting probe is composed of a first shell extending from the gauge head and an ultrasonic transmitter arranged in the first shell, the ultrasonic receiving probe is composed of a second shell extending from the gauge head and an ultrasonic receiver arranged in the second shell, and a virtual connecting line between the ultrasonic transmitter and the ultrasonic receiver forms an angle with the flowing direction of crude oil.

5. The ultrasonic detector of water content in crude oil of claim 4, wherein the linear distance between the ultrasonic transmitter and the ultrasonic receiver is 0.2 m.

6. The ultrasonic detector of water content in crude oil of claim 5, wherein the ultrasonic transmitter and the ultrasonic receiver are sealed in the first and second housings, respectively.

7. The ultrasonic detector for the water content of crude oil according to any one of claims 2 to 6, wherein a liquid crystal display screen for displaying the water content of crude oil is arranged outside the gauge head, and the liquid crystal display screen is connected with the processing module.

Technical Field

The invention relates to the technical field of crude oil detection, in particular to an ultrasonic detection method for water content of crude oil and a detector using the same.

Background

In the petroleum industry, the water content of crude oil is an important index, and the water level and the oil layer position of an oil well can be predicted through the index, so that the yield and the exploitation value of the crude oil can be estimated, the exploitation degree can be predicted, a corresponding exploitation scheme can be formulated, and the important significance in predicting the development life of the oil well is achieved. The water content of the crude oil has great influence on the exploitation, gathering and transportation, dehydration, measurement, sale, refining and the like of the crude oil, the water content of the crude oil needs to be accurately known in time in the oil field production, the working state of an oil well is estimated according to the water content of the crude oil, the automatic management of the oil field is improved, and the production efficiency is improved.

The method for measuring the water content of crude oil commonly used at present can be roughly divided into an off-line measuring method and an on-line measuring method. The basic principle of the off-line measurement method is to separate the water in the crude oil, namely the water can be represented in a volume ratio form and can be substituted into an oil-water density value to calculate the mass water content; the distillation method, the electric dehydration method, and the Karl Fischer method are mainly used depending on the means of oil-water separation. The on-line measurement method mainly comprises a conductivity method, a density method, an electromagnetic wave method, a capacitance method and a ray method. Based on the requirements of oil field automatic production, an online measurement method becomes a mainstream measurement method.

Because the moisture content of the crude oil changes all the time, the sampling speed is required to be fast enough, and the moisture content condition of the sample can represent the actual moisture content condition of the crude oil. According to the measurement condition of the water content in the oil field production process in China, the sensor is a main component of a crude oil water content measuring instrument, and the sensor is greatly influenced by many factors, such as temperature. At present, in the multi-sensor fusion technology, a plurality of sensors are used for detecting a plurality of variables at the same time, and mainly aiming at factors which have great influence on the water content of crude oil, the influence of other influencing factors on the water content of the crude oil can be reduced to the minimum degree; however, the multi-sensor fusion brings about the increase of the design cost and the use cost.

An invention patent application CN 109298070A published by the State intellectual Property office 2019, 2, month and 1 discloses a method for detecting the water content of crude oil based on an ultrasonic sound velocity method, wherein the method for measuring the water content of the crude oil by the ultrasonic sound velocity method has the advantages of wide measurement range, simple equipment, low cost, easiness in maintenance and the like, but has the defect that the measurement accuracy is greatly influenced by temperature. Therefore, the invention designs a temperature compensation mechanism model based on the Urick model, and then obtains a crude oil water content detection model based on the mechanism model and experimental data; the experimental data are from different water content sample experiments at constant temperature and temperature change experiments in constant water content samples. This scheme is firstly comparatively complicated, secondly influences not only temperature of moisture content detection precision, still bubble content, crude oil viscosity change etc. do not consider among them in the scheme other factors except temperature.

Disclosure of Invention

Aiming at the problems, the invention provides the ultrasonic detection method for the water content of the crude oil and the detector using the method, which have the advantages of simple principle, convenience in use and high detection precision.

The invention protects an ultrasonic detector for the water content of crude oil, which comprises the steps of firstly representing the relation between two variables of the water content of the crude oil and an ultrasonic time difference by using a linear function, wherein the ultrasonic time difference refers to the time difference between the ultrasonic signal sent by an ultrasonic transmitting probe and the ultrasonic signal received by an ultrasonic receiving probe; and then obtaining the water content of the crude oil according to the linear function relationship between the water content of the crude oil and the ultrasonic time difference and the actually measured ultrasonic time difference.

The invention also protects an ultrasonic detector for the water content of the crude oil, which comprises an ultrasonic transmitting probe, an ultrasonic receiving probe, an excitation module connected with the ultrasonic transmitting probe and a processing module connected with the ultrasonic receiving probe, wherein the excitation module is controlled by the processing module, the excitation module and the processing module are arranged in a gauge outfit, the ultrasonic transmitting probe and the ultrasonic receiving probe extend out from two sides below the gauge outfit, and the ultrasonic transmitting probe and the ultrasonic receiving probe are immersed in the crude oil during detection;

the processing module is internally provided with a linear calibration unit and a linear operation unit; the linear calibration unit is used for carrying out linear calibration on the water content of the crude oil and the ultrasonic time difference according to the crude oil sampling data of the oil field to form a linear function relation between the water content of the crude oil and the ultrasonic time difference; and the linear operation unit obtains the water content of the crude oil according to the linear function relation between the water content of the crude oil and the ultrasonic time difference and the actually-measured ultrasonic time difference.

Furthermore, the detector testing section is arranged in the constant temperature box.

Further, the ultrasonic transmitting probe is composed of a first shell extending out from the gauge head and an ultrasonic transmitter arranged in the first shell, the ultrasonic receiving probe is composed of a second shell extending out from the gauge head and an ultrasonic receiver arranged in the second shell, and a virtual connecting line between the ultrasonic transmitter and the ultrasonic receiver forms a certain angle with the flowing direction of crude oil.

Further, the linear distance between the ultrasonic transmitter and the ultrasonic receiver is 0.2 m.

Further, the ultrasonic transmitter and the ultrasonic receiver are respectively sealed in the first shell and the second shell.

Furthermore, a liquid crystal display screen for displaying the water content of the crude oil is arranged outside the gauge outfit, and the liquid crystal display screen is connected with the processing module.

The invention adopts the analysis path different from the prior art, avoids the analysis of various and complicated processes, directly starts with the result and provides the practical scheme of the ultrasonic detector for the moisture content of the crude oil with simple principle, convenient use and high detection precision; the arrangement of the constant temperature box reduces the influence of temperature change on the measurement result of the water content of the crude oil, and can also be used in combination with temperature compensation; the mounting angle and the mounting distance between the ultrasonic transmitter and the ultrasonic receiver are optimally designed, so that the accuracy of a detection result is improved; the liquid crystal display facilitates reading.

Drawings

FIG. 1 is a block diagram of the internal structure of an ultrasonic detector for water content of crude oil;

FIG. 2 is a schematic diagram of the external structure and the use state of an ultrasonic detector for the water content of crude oil;

FIG. 3 is an equivalent diagram of the oil-water mixture.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.