A pipeline sand content monitoring device with dual probes

Abstract

The present invention discloses a pipeline sand content monitoring device with dual probes, including: a power module, a display terminal, an analysis host, and at least one piezoelectric transducer. The elbow piezoelectric transducer is used to obtain a first sound wave signal including an environmental noise signal and the collision of sand particles with the inner wall of the pipeline, and the straight tube piezoelectric transducer is used to obtain a second sound wave signal caused by the environmental noise. The first sound wave signal and the second sound wave signal are processed and analyzed by the analysis host, and finally the sand content of the pipeline is displayed through the display terminal. The method solves the problem of easy omission and false alarm caused by the interference of environmental factors in the single-probe sand content monitoring device.

Description

Technical Field

[0001] The invention relates to a device for monitoring sand content in oil and gas field pipelines, in particular to a device for real-time monitoring sand content in wellhead pipelines of offshore oil and gas fields. Background Art

[0002] In the process of oil and gas well exploitation, sand production is a common phenomenon and one of the difficulties in oil field development, especially in the middle and late stages of oil field development. Long-term water injection or gas injection production will also greatly damage the reservoir skeleton, causing sand production in the oil well.

[0003] The sand monitoring devices based on acoustic principles currently used in offshore oil and gas fields are generally subject to false alarms and missed alarms due to the influence of platform vibration, offshore wind and waves, and noise from manual operations. At the same time, when the environment changes, the parameters of the monitoring device need to be reset. Due to the high degree of professionalism of the equipment, the manufacturer needs to go to the offshore platform for debugging, which takes too long. Due to the inability to accurately monitor the sand content of the pipeline, the offshore platform lags behind in sand prevention and removal, which has a great impact on the production of offshore oil and gas fields. Summary of the invention

[0004] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a pipeline sand content monitoring device with double probes which will not produce missed reporting and false reporting of sand content.

[0005] The objectives of the present invention are achieved through the following technical solutions.

[0006] The invention discloses a pipeline sand content monitoring device with dual probes, wherein an elbow piezoelectric transducer is fixed at the elbow of the pipeline, and at least one straight tube piezoelectric transducer is fixed at intervals on the straight pipe section of the pipeline, the elbow piezoelectric transducer is used to obtain a first sound wave signal including an environmental noise signal and a collision between sand particles and an inner wall of the pipeline, and the straight tube piezoelectric transducer is used to obtain a second sound wave signal caused by the environmental noise; the distance between the straight tube piezoelectric transducer and the elbow piezoelectric transducer is 1-2m; the elbow piezoelectric transducer and the straight tube piezoelectric transducer are respectively connected to an analysis host through signal lines, the first sound wave signal and the second sound wave signal are respectively transmitted to the analysis host, and the analysis host performs the following steps:

[0007] The first step is to determine whether the number of second acoustic wave signals is greater than 1. If so, the waveforms of the second acoustic wave signals are compared with each other. If the waveforms of the second acoustic wave signals are consistent, it is determined that the straight tube piezoelectric transducer is installed correctly, and then the second step is executed; otherwise, the straight tube piezoelectric transducers are adjusted relative to each other or replaced until the waveforms of the second acoustic wave signals are consistent, and then the second step is executed; if it is determined that the number of second acoustic wave signals is 1, the second step is executed;

[0008] The second step is to compare the waveforms of the first waveform signal and the second sound wave signal. If the waveforms of the two are consistent, it is determined that there is no sand in the pipeline; otherwise, it is determined that there are sand in the pipeline, and then the next step is executed;

[0009] The third step is to calculate the collision energy of the sand particles in the pipeline according to the difference in amplitude between the first sound wave signal and the second sound wave signal for the wave bands where the waveforms of the first sound wave signal and the second sound wave signal are inconsistent, and the mass of the sand particles is calculated according to the flow rate of the pipeline fluid, and the total mass of the sand particles is calculated by accumulating the mass of the sand particles over a period of time, and the total mass of the sand particles is the total amount of sand contained in the period of time;

[0010] The display terminal is connected to the analysis host through a signal line. The display terminal is used to output the first sound wave signal waveform and the second sound wave signal waveform and the judgment result of whether sand is contained. If sand is contained, the total mass of sand particles is displayed according to the calculation result of the third step above.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) Technical value: Improve the company's offshore oil and gas pipeline sand content monitoring technology level, provide solutions to the problems of missed and false alarms in sand content monitoring, and make up for the shortcomings of existing sand content monitoring equipment.

[0013] (2) Economic value: As offshore oil fields enter the middle and late stages of development and as heavy oil is mined, the sand content of oil field output gradually increases. Sand content monitoring equipment is mainly used in the Bohai Oilfield and the South China Sea Oilfield. It can be applied on a large scale and is expected to be used more than 100 times.

[0014] (3) Application value: Currently, there are more and more sand problems in offshore oil and gas fields. This device can be used to monitor the sand content in pipelines and provide data support for effective sand prevention and control on offshore platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a pipeline sand content monitoring device with dual probes according to the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings:

[0017] like Figure 1 As shown, a pipeline sand content monitoring device with dual probes of the present invention has an elbow piezoelectric transducer 4 fixed at the elbow of the pipeline 1, and at least one straight tube piezoelectric transducer 6 is fixed at intervals on the straight pipe section of the pipeline. The straight tube piezoelectric transducer 6 and the elbow piezoelectric transducer 4 can be fixed to the pipeline 1 by using stainless steel clamps. Both the straight tube piezoelectric transducer 6 and the elbow piezoelectric transducer 4 use existing piezoelectric transducers, which are available on the market.

[0018] The elbow piezoelectric transducer 4 is used to obtain the first sound wave signal 3 including the environmental noise signal and the collision of sand particles with the inner wall of the pipe, and the straight tube piezoelectric transducer 6 is used to obtain the second sound wave signal caused by the environmental noise. Figure 2 is the movement trajectory of the sand particles.

[0019] The distance between the straight tube piezoelectric transducer 6 and the elbow piezoelectric transducer 4 is 1-2m, so that the sand in the pipeline can collide with the inner wall of the pipeline elbow, and the sound wave signal is acquired by the elbow piezoelectric transducer 4. When it is transmitted to the straight tube piezoelectric transducer 6 area, it has been attenuated to 0. At this time, the signal acquired by the elbow piezoelectric transducer 4 includes the environmental noise signal and the sound wave signal of the sand colliding with the inner wall of the pipeline, and the straight tube piezoelectric transducer 6 only acquires the environmental noise signal.

[0020] The elbow piezoelectric transducer 4 and the straight tube piezoelectric transducer 6 are respectively connected to the analysis host through signal lines, and the first sound wave signal and the second sound wave signal are respectively transmitted to the analysis host, and the analysis host performs the following steps:

[0021] The first step is to determine whether the number of the second sound wave signals is greater than 1. If so, the waveforms of the second sound wave signals are compared with each other. If the waveforms of the second sound wave signals are consistent, it is determined that the straight tube piezoelectric transducer 6 is installed correctly, and then the second step is executed; otherwise, the straight tube piezoelectric transducers are adjusted relative to each other or replaced until the waveforms of the second sound wave signals are consistent, and then the second step is executed; if it is determined that the number of the second sound wave signals is 1, the second step is executed;

[0022] The second step is to compare the waveforms of the first waveform signal and the second sound wave signal. If the waveforms of the two are consistent, it is determined that there is no sand in the pipeline; otherwise, it is determined that there are sand in the pipeline, and then the next step is executed;

[0023] The third step is to calculate the collision energy of the sand particles in the pipeline according to the amplitude difference between the first sound wave signal and the second sound wave signal for the wave bands where the waveforms are inconsistent (see formula 1 below for the calculation formula), and calculate the mass of the sand particles according to the flow rate of the pipeline fluid (see formula 3 for the calculation formula), and calculate the total mass of the sand particles by accumulating the mass of the sand particles over a period of time. The total mass of the sand particles is the total amount of sand contained in that period of time.

[0024] (1)

[0025] Where: is the collision energy of the ith sand particle, is the amplitude difference between the first sound wave signal and the second sound wave signal at the i-th sand grain, and is the voltage difference. is the conversion coefficient between the amplitude difference between the first acoustic wave signal and the second acoustic wave signal and the collision energy, which is an empirical value obtained through laboratory sand content monitoring test. That is, in the laboratory environment, the sand collision energy can be obtained according to the movement speed of the sand particles using Formula 3, and the amplitude difference between the first acoustic wave signal and the second acoustic wave signal can be obtained by the piezoelectric transducer, which can be inferred from Formula 2 , Can be measured in advance. That is:

[0026] (2)

[0027] (3)

[0028] Where: is the collision energy of the ith sand particle, is the inherent parameter of the piezoelectric transducer, which is an empirical value and is usually 0.8. is the mass of the ith sand particle, and v is the fluid velocity.

[0029] The display terminal is connected to the analysis host through a signal line. The display terminal is used to output the first sound wave signal waveform and the second sound wave signal waveform and the judgment result of whether sand is contained. If sand is contained, the total mass of sand particles is displayed according to the calculation result of the third step above.

[0030] The analysis host and the display terminal are powered by a power module, and the power module is used to provide 24V power to the analysis host and the display terminal.

[0031] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific functions and working processes. The above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A method for using a pipeline sand monitoring device with dual probes, characterized in that: An elbow piezoelectric transducer is fixed at the elbow of the pipeline, and at least one straight tube piezoelectric transducer is fixed at intervals on the straight tube section of the pipeline. The elbow piezoelectric transducer is used to obtain a first sound wave signal including an environmental noise signal and a collision between sand particles and the inner wall of the pipeline, and the straight tube piezoelectric transducer is used to obtain a second sound wave signal caused by the environmental noise; the distance between the straight tube piezoelectric transducer and the elbow piezoelectric transducer is 1-2m; the elbow piezoelectric transducer and the straight tube piezoelectric transducer are respectively connected to the analysis host through signal lines, and the first sound wave signal and the second sound wave signal are respectively transmitted to the analysis host, and the analysis host performs the following steps: The first step is to determine whether the number of second acoustic wave signals is greater than 1. If so, the waveforms of the second acoustic wave signals are compared with each other. If the waveforms of the second acoustic wave signals are consistent, it is determined that the straight tube piezoelectric transducer is installed correctly, and then the second step is executed; otherwise, the straight tube piezoelectric transducers are adjusted relative to each other or replaced until the waveforms of the second acoustic wave signals are consistent, and then the second step is executed; if it is determined that the number of second acoustic wave signals is, the second step is executed; The second step is to compare the waveforms of the first waveform signal and the second sound wave signal. If the waveforms of the two are consistent, it is determined that there is no sand in the pipeline; otherwise, it is determined that there are sand in the pipeline, and then the next step is executed; The third step is to calculate the collision energy of the sand particles in the pipeline according to the amplitude difference between the first sound wave signal and the second sound wave signal for the wave band where the waveforms of the first sound wave signal and the second sound wave signal are inconsistent, and the mass of the sand particles is inversely calculated according to the flow rate of the pipeline fluid using the formula for calculating the collision energy of the sand particles in the pipeline using the amplitude difference, and the total mass of the sand particles is obtained by accumulating the mass of the sand particles over a period of time, and the total mass of the sand particles is the total amount of sand contained in the period of time; The formula for calculating the collision energy of sand particles in the pipeline using the amplitude difference is: S i =C1*ΔA i Where: S i is the collision energy of the i-th sand particle, ΔA i is the amplitude difference between the first acoustic wave signal and the second acoustic wave signal at the i-th sand grain, is the voltage difference, C1 is the conversion coefficient between the amplitude difference between the first acoustic wave signal and the second acoustic wave signal and the collision energy, C2 is the inherent parameter of the piezoelectric transducer, and m i is the mass of the i-th sand particle, v is the fluid velocity; In the fourth step, the display terminal is connected to the analysis host through a signal line, and the display terminal outputs the first sound wave signal waveform and the second sound wave signal waveform as well as the judgment result of whether sand is contained. If sand is contained, the total mass of sand particles is displayed according to the calculation result of the third step above.

Images