An improved automatic measuring device for the water content of produced fluid from oilfield production wells

Abstract

The invention discloses an improved automatic measuring device for the water content of produced fluid in oilfield production wells, comprising: a controller, a liquid inlet pipe, a first pipeline, a second pipeline and a liquid outlet pipe; a first electric valve is arranged on the first pipeline; a second electric valve, a first static mixer, a pressure gauge, a second static mixer and a water content sensor are arranged in sequence along the flow direction of the liquid in the pipeline on the second pipeline; the pipe diameter between the first static mixer and the second static mixer changes uniformly from large to small to a preset pipe diameter; the controller is respectively connected to the first electric valve and the second electric valve for control; the controller is respectively connected to the pressure gauge and the water content sensor for communication. When measuring the water content, the device can increase the flow rate of the produced fluid by changing the pipe diameter from large to small through the first transition pipe, and cooperates with the static mixer to allow the produced fluid to be fully mixed before accurate measurement; the device requires fewer components, has a simple structure, a small volume and high measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of oil field measurement, in particular to an improved automatic measurement device for the water content of produced fluid from an oil field production well. Background Art

[0002] At present, in all the oil wells in the world, oil production rate and oil production are the most important basic data of oil field production. The vast majority of oil fields in my country use secondary and tertiary oil recovery operations. Secondary oil recovery uses water drive technology, and tertiary oil recovery uses ternary composite drive technology. Due to the aging of oil fields, large oil fields in my country such as Daqing Oilfield, Jilin Oilfield, Tarim Oilfield, and Shengli Oilfield mostly use similar technologies for deep oil recovery.

[0003] Under the conditions of secondary and tertiary flooding operations, the produced product is a three-phase flow (gas phase, water phase, oil phase). The possible components in the gas phase are H2S, CO2 and low-carbon hydrocarbons, the water phase contains flooding chemicals, and the oil phase refers to crude crude oil. In order to monitor the produced water volume of oil wells in real time and accurately grasp the oil production of oil wells, each oil field must regularly measure the water content of the oil well output fluid.

[0004] However, in the prior art, after the three-phase flow is transferred from underground to the surface, the morphology changes due to changes in temperature and pressure, and the oil, water and gas are separated quickly. The gas overflows from the bulk phase, the water phase sinks, and the oil phase floats. The water phase contains an uncertain amount of oil in the form of water-in-oil, and the oil phase contains an uncertain amount of water in the form of oil-in-water. The oil content in the form of water-in-oil and the water content in oil-in-water are both dynamically changing, making it very difficult to measure the crude oil yield. Since there is no simple and reliable method to test the oil-water ratio in oil fields, it is difficult to make progress in the dataization of oil fields, especially the measurement of working conditions with high gas and high water content in the produced fluid is more difficult.

[0005] Moreover, some existing patented technologies and products, in order to ensure the reliability of measurement, must ensure the cleanliness of the surface of the moisture content sensor, and require a self-priming pump and four solenoid valves to achieve self-cleaning and measurement. The structure is cumbersome and the volume is bulky.

[0006] Therefore, how to develop an automatic measuring device for the water content of produced fluid from oil field production wells that has high reliability, small size and can meet the needs of on-site installation and maintenance is an issue that practitioners in the same field urgently need to solve. Summary of the invention

[0007] In view of the above problems, the present invention provides an improved automatic measuring device for the water content of produced fluid from oil field production wells, which can solve at least part of the above technical problems.

[0008] An improved automatic measuring device for the water content of produced fluid from oilfield production wells, comprising: a controller and a measuring device body; the measuring device body comprises: a liquid inlet pipe, a first pipeline, a second pipeline and a liquid outlet pipe;

[0009] The inlet end of the liquid inlet pipe is connected to the wellhead pipeline through a flange, and the outlet end is connected to the input ends of the first pipeline and the second pipeline respectively;

[0010] The output ends of the first pipeline and the second pipeline are respectively connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the main pipeline;

[0011] in:

[0012] A first electric valve is provided on the first pipeline;

[0013] On the second pipeline, a second electric valve, a first static mixer, a pressure gauge, a second static mixer and a water content sensor are sequentially arranged along the flow direction of the liquid in the pipeline;

[0014] The pipe between the first static mixer and the second static mixer is a first transition pipe; the pipe diameter of the first transition pipe changes uniformly from large to small to a preset pipe diameter, and the inner wall of the first transition pipe transitions smoothly;

[0015] The controller is respectively connected to the first electric valve and the second electric valve for control; the controller is respectively connected to the pressure gauge and the water content sensor for communication;

[0016] Furthermore, the pipe between the water content sensor and the liquid outlet pipe is a second transition pipe;

[0017] The diameter of the second transition pipeline gradually increases from a preset diameter and evenly transitions to the same diameter as the second pipeline.

[0018] Furthermore, it also includes: a cleaning component for cleaning the moisture content sensor;

[0019] The cleaning component comprises: a driving mechanism, a transmission mechanism and a cleaning mechanism;

[0020] The cleaning mechanism is installed on the pipe wall, one end of the cleaning mechanism is connected to the transmission mechanism, and the other end of the cleaning mechanism has a cleaning ring; the cleaning ring is sleeved on the probe of the water content sensor;

[0021] The driving mechanism drives the transmission mechanism to reciprocate through the output shaft; the transmission mechanism drives the cleaning ring to reciprocate;

[0022] The controller is controllably connected to the driving mechanism.

[0023] Furthermore, the cleaning mechanism is in an I-shape; comprising: a limiting rod, a connecting rod and a cleaning rod connected in sequence;

[0024] One end of the limiting rod is connected to the driving mechanism, the connecting rod is penetrated through the pipeline wall, and one end of the cleaning rod is provided with the cleaning ring.

[0025] Furthermore, a first sealing ring is provided between the connecting rod and the pipe wall; a second sealing ring is provided at a position of the cleaning rod corresponding to the pipe wall; and a third sealing ring is provided at a position of the limiting rod corresponding to the pipe wall.

[0026] Furthermore, the cleaning ring is an annular brush or rubber.

[0027] Furthermore, the controller is a PLC controller or an industrial computer.

[0028] Furthermore, the controller is also provided with: a wireless communication module; the controller is connected to a remote terminal via wireless communication.

[0029] Furthermore, the wireless communication module includes one or more of the following:

[0030] WIFI module, public mobile communication network communication module, Bluetooth module and near field communication module.

[0031] An improved automatic measuring device for the water content of produced fluid from a production well in an oil field provided by an embodiment of the present invention comprises: a controller and a measuring device body; the measuring device body comprises: a liquid inlet pipe, a first pipeline, a second pipeline and a liquid outlet pipe; the inlet end of the liquid inlet pipe is connected to the wellhead pipeline through a flange, and the outlet end is respectively connected to the input end of the first pipeline and the second pipeline; the output ends of the first pipeline and the second pipeline are respectively connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the main pipeline; a first electric valve is arranged on the first pipeline; on the second pipeline, a second electric valve, a first static mixer, a pressure gauge, a second static mixer and a water content sensor are arranged in sequence along the flow direction of the liquid in the pipe; the pipeline between the first static mixer and the second static mixer is a first transition pipeline; the diameter of the first transition pipeline changes uniformly from large to small to a preset diameter, and the inner wall of the first transition pipeline transitions smoothly; the controller is respectively connected to the first electric valve and the second electric valve for control; the controller is respectively connected to the pressure gauge and the water content sensor for communication. When measuring the water content, the device can increase the flow rate of the produced fluid by changing the diameter of the first transition pipe from large to small, and cooperate with two static mixers to allow the fully mixed produced fluid to be fully mixed before accurate measurement. Compared with traditional measuring devices, the device of the present invention requires fewer components, has a simple structure, a small size, takes up less space, and has higher measurement accuracy.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0033] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 A schematic structural diagram of an improved automatic measuring device for the water content of produced fluid from an oilfield production well provided in an embodiment of the present invention;

[0036] Figure 2 A cross-sectional schematic diagram of the installation relationship between the moisture content sensor and the cleaning mechanism provided in an embodiment of the present invention.

[0037] Figure 3 A schematic diagram of the structure of the connection between the controller and multiple components provided in an embodiment of the present invention.

[0038] In the accompanying drawings: 1-controller, 2-measuring device body, 21-liquid inlet pipe, 22-first pipeline, 23-second pipeline, 24-liquid outlet pipe, 221-first electric valve, 231-second electric valve, 232-first static mixer, 233-pressure gauge, 234-second static mixer, 235-water content sensor, 236-first transition pipeline, 237-second transition pipeline, 3-cleaning component, 31-driving mechanism, 32-transmission mechanism, 33-cleaning mechanism, 331-cleaning ring, 332-limiting rod, 333-connecting rod, 334-cleaning rod, 335-first sealing ring, 336-second sealing ring, 337-third sealing ring, pipeline wall 4. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] Reference Figure 1As shown, an improved automatic measuring device for the water content of produced fluid from a production well in an oil field provided by an embodiment of the present invention comprises: a controller 1 and a measuring device body 2;

[0041] The measuring device body 2 is arranged according to the pipeline, and includes four parts, namely, a liquid inlet pipe 21, a first pipeline 22, a second pipeline 23 and a liquid outlet pipe 24: the inlet end of the liquid inlet pipe 21 is connected to the wellhead pipeline through a flange, and the outlet end is connected to the input ends of the first pipeline 22 and the second pipeline 23 respectively;

[0042] The output ends of the first pipeline 22 and the second pipeline 23 are respectively connected to one end of a liquid outlet pipe 24, and the other end of the liquid outlet pipe 24 is connected to the main pipeline.

[0043] Then, the first electric valve 221 is installed on the first pipeline 22, and the second electric valve 231, the first static mixer 232, the pressure gauge 233, the second static mixer 234 and the water content sensor 235 are installed on the second pipeline 23 in sequence according to the flow direction of the liquid in the pipeline. The pipeline between the first static mixer 232 and the second static mixer 234 is the first transition pipeline 236; the diameter of the first transition pipeline 236 changes uniformly from large to small to a preset diameter, and the inner wall of the first transition pipeline 236 has a smooth transition. In this embodiment, the specific structure of the water content sensor is not limited, and the water content sensor in the prior art can be used.

[0044] For example, if the diameter of the second pipeline is 20 cm, the diameter of the first transition pipeline can be uniformly changed from 20 cm to 10 cm. The preset diameter can be selected according to the specific working environment; the present embodiment does not limit the value of the preset diameter.

[0045] In the first transition pipe 236, when the liquid in the pipe is restricted to flow through the reduced flow cross section, the fluid velocity increases and is fully mixed by the first static mixer and the second static mixer. Static mixers are respectively arranged in pipes of different diameters, and the flow state of the liquid in the pipe is changed by using the mixing unit body fixed in the pipe, so as to achieve the purpose of good dispersion and full mixing between water, oil and gas, thereby improving the accurate measurement of water content.

[0046] The controller 1 is respectively connected to the first electric valve 221 and the second electric valve 231, and receives the control signal of the controller 1 to realize opening and closing. The controller 1 is respectively connected to the pressure gauge 233 and the water content sensor 235 for communication, and in the measurement state, the pressure data in the pipeline and the water content data of the produced fluid are obtained in real time.

[0047] The working principle when measuring moisture content is as follows:

[0048] In the measuring state, the first electric valve 221 is closed and the second electric valve 231 is opened by the control of the controller 1. Figure 1 As shown; the produced liquid passes through the liquid inlet pipe 21, flows into the second pipeline 23, then passes through the second electric valve 231, the first static mixer 232, the pressure gauge 233, the first static mixer 234, and then passes through the water content sensor 235, and passes through the liquid outlet pipe 24, and returns to the produced liquid main pipeline. The pressure gauge 233 monitors the pressure condition all the time and is connected to the controller 1. When the controller 1 determines that the pressure exceeds the defined pressure, it immediately controls to open the first electric valve 221 for pressure relief protection, and the measurement process is suspended; after the pressure in the pipeline returns to the normal range for a period of time, the next operation begins.

[0049] When measuring the water content, the device increases the flow rate of the produced fluid by changing the diameter of the first transition pipe 236 from large to small, and cooperates with two static mixers to allow the fully mixed produced fluid to be fully mixed before accurate measurement. Compared with traditional measuring devices, the device of the present invention requires fewer components, has a simple structure, a small size, takes up less space, and has higher measurement accuracy.

[0050] In practical applications, both ends of the pipeline where the moisture content sensor is installed can be connected to the second pipeline through flanges; when the moisture content sensor fails, it is convenient to repair and replace it.

[0051] Furthermore, after the measurement is completed, in order to facilitate the discharge of the liquid in the pipeline and reduce the pressure in the pipeline, the pipeline between the water content sensor 235 and the liquid outlet pipe 24 is also designed as a pipeline with a uniformly enlarged diameter transition, which is called the second transition pipeline 237. The diameter of the second transition pipeline 237 is gradually increased from the above-mentioned preset diameter and uniformly transitioned to the same diameter as the second pipeline 23.

[0052] In one embodiment, during the long-term measurement process of the moisture content sensor 235, the surface probe is prone to be attached with some mud, sticky substances and corrosive substances, resulting in errors or inaccurate measurements in subsequent measurements; therefore, the surface of the moisture content sensor 235 needs to be cleaned regularly.

[0053] The device also includes a cleaning component 3 for cleaning the moisture content sensor; Figure 2 As shown, the cleaning component 3 is assembled with the moisture content sensor 235; wherein the cleaning component 3 comprises: a driving mechanism 31, a transmission mechanism 32 and a cleaning mechanism 33; the driving mechanism 31 drives the transmission mechanism 32 to reciprocate via an output shaft.

[0054] The cleaning mechanism 33 is penetrated through the pipe wall 4, one end of the cleaning mechanism 33 is on the transmission mechanism 32, and the other end has a cleaning ring 331; the cleaning ring 331 is sleeved on the probe of the moisture content sensor 235; the driving mechanism 31 drives the transmission mechanism 32 to reciprocate through the output shaft; the transmission mechanism 32 drives the cleaning ring 331 to reciprocate; the controller 1 is controlled and connected with the driving mechanism 31.

[0055] The driving mechanism 1 may be driven by hydraulic pressure, pneumatic pressure, electrical pressure, mechanical pressure, etc., which is not limited in the embodiment of the present disclosure.

[0056] The transmission mechanism may be a transmission component such as a connecting rod, a gear rack, a chain, etc.; the corresponding transmission mechanism may be selected according to the specific driving mechanism.

[0057] For example, taking an electrically driven drive motor as an example, the controller is connected to the drive motor driver control; the working principle of automatic cleaning is explained below:

[0058] When the measurement is completed, the first electric valve 221 is closed and the second electric valve 231 is opened through the control of the controller 1. The drive motor starts to work by controlling the driver, and the gear rack mechanism is driven to reciprocate through the output shaft, so that the cleaning mechanism 33 can reciprocate back and forth, driving the cleaning ring 331 to clean back and forth on the surface of the moisture sensor 235 to ensure that there is no attachment on the surface. Similarly, the pressure gauge 233 monitors the pressure condition all the time and is connected to the controller 1. When the controller 1 determines that the pressure exceeds the defined pressure, it immediately controls to open the first electric valve 221 for pressure relief protection, and the cleaning process is suspended; after the pressure returns to the normal range for a period of time, the cleaning operation is performed again.

[0059] In the cleaning state, the device increases the flow rate of the produced fluid by changing the diameter of the first transition pipe 236 from large to small, and flushes the water content sensor 235 with high-speed liquid; at the same time, in conjunction with the reciprocating cleaning ring 331, the two methods work together to clean the attachments on the surface of the water content sensor 235.

[0060] In this embodiment, since the water content of the produced crude oil is relatively high, the crude oil can be used to clean the surface of the water content sensor 235. After measuring the water content, the device can realize automatic cleaning. The specific automatic cleaning process is as follows: According to the oil quality of the medium, such as the water content, the corresponding cleaning time can be set. For example, when the water content of the oil is above 90%, the cleaning time is 30 minutes. Through automatic cleaning, maintenance-free is achieved, which can also extend the service life of the measuring device and improve the measurement accuracy.

[0061] Furthermore, the cleaning mechanism 33 may be in an I-shape, including: a limiting rod 332, a connecting rod 333 and a cleaning rod 334 connected in sequence; one end of the limiting rod 332 is connected to the transmission mechanism 32, the connecting rod 333 is inserted through the pipe wall 4, and one end of the cleaning rod 334 is provided with a cleaning ring 331. The material of the cleaning ring 331 may be, for example, rubber or a brush, as long as it is convenient to clean the attachments on the probe of the moisture content sensor 235, and the embodiment of the present disclosure is not limited to this.

[0062] Furthermore, in order to prevent leakage of the medium in the pipe between the connecting rod 333 and the pipe wall 4, a first sealing ring 335 may be provided between the two; at the same time, in order to reduce the collision force between the cleaning rod 334 and the pipe wall 4 (inside the pipe), a second sealing ring 336 is provided, which can not only seal but also buffer the collision force. Similarly, a third sealing ring 337 may be provided at the position corresponding to the limiting rod 332 and the pipe wall 4 (outside the pipe).

[0063] Further, see Figure 3 As shown, the controller 1 may be, for example, a PLC controller, which is a programmable logic controller (PLC), a digital electronic device with a microprocessor, and a digital logic controller for automatic control. The PLC controller may load the control instructions of the first electric valve, the second electric valve, and the drive mechanism into the memory for storage and execution.

[0064] In addition, the controller 1 can also be an industrial computer, which has important computer properties and features, such as a computer CPU, hard disk, memory, peripherals and interfaces, an operating system, a control network and protocol, computing power, and a friendly human-computer interface. For example, the measuring device can be equipped with a temperature sensor, a pressure sensor, a concentration meter, etc. on the pipeline or in the separator, and the feedback data of the above-mentioned sensor equipment can be obtained through the industrial computer, such as displaying parameters such as temperature, pressure, and concentration.

[0065] Furthermore, the controller may also be provided with a wireless communication module to achieve connection with a remote terminal, receive control instructions from the remote terminal, and also feedback relevant parameters of the real-time working status, so as to achieve remote control of the measurement time and frequency, and meet the actual needs of oil field production. Among them, the wireless communication module may be any one of a WIFI module, a public mobile communication network communication module, a Bluetooth module, and a near field communication module. The public mobile communication network communication module may be a 2G, 3G, 4G, 5G communication module of various standards, and the near field communication module may be an NFC (Near Field Communication) module, etc.

[0066] When the measuring device equipped with the cleaning component is measuring the moisture content, the first electric valve 221 is closed and the second electric valve 231 is opened through the control of the controller 1, the cleaning component does not work, and the inner wall of the cleaning rod is tightly pressed against the inner side of the pipe wall and the second sealing ring. At the same time, the first sealing ring and the second sealing ring work together to ensure a reliable sealing effect.

[0067] An improved automatic measuring device for the water content of produced fluid from oilfield production wells provided in an embodiment of the present invention utilizes the change in pipe diameter to set a first transition pipe, and realizes the automation of measuring the water content and cleaning the water content sensor through the control connection between the controller and various components.

[0068] It has the following advantages:

[0069] 1. Ordinary water content measurement uses a liquid-gas separator, which has a very large structure. In addition, due to the complex composition of the output liquid and the different gas volumes, the results are inaccurate. In contrast, the measuring device of the embodiment of the present disclosure has a simple structure, a small volume, and takes up less space. The water content measurement result is more accurate.

[0070] 2. In addition, some moisture content measuring devices with pumps and heating devices are relatively large in size and require explosion-proof design due to the need for pumps and heating devices; the measuring device of the embodiment of the present disclosure is also simple in structure and does not require the design of explosion-proof components, has low economic cost, and is small in size;

[0071] 3. The measuring device provided by the embodiment of the present invention eliminates the pump and only uses the change of pipe diameter and static mixer to achieve the acceleration of flow rate and sufficient mixing; a low-power driving mechanism and a simple transmission mechanism are used to drive the cleaning mechanism. Among them, the second sealing ring realizes the sealing between the pipeline and the cleaning mechanism under the pressure of the produced fluid, which reduces the technical feasibility and reliability of the sealing; and also adds a reliable preparatory device. Even if the first sealing ring and the second sealing ring fail, the third sealing ring can still play a sealing role.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An improved automatic measuring device for the water content of produced fluid from oilfield production wells, characterized in that: include: A controller (1) and a measuring device body (2); The measuring device body (2) comprises: a liquid inlet pipe (21), a first pipeline (22), a second pipeline (23) and a liquid outlet pipe (24); The inlet end of the liquid inlet pipe (21) is connected to the wellhead pipeline through a flange, and the outlet end is respectively connected to the input ends of the first pipeline (22) and the second pipeline (23); The output ends of the first pipeline (22) and the second pipeline (23) are respectively connected to one end of the liquid outlet pipe (24), and the other end of the liquid outlet pipe (24) is connected to the main pipeline; in: The first pipeline (22) is provided with a first electric valve (221); The second pipeline (23) is provided with a second electric valve (231), a first static mixer (232), a pressure gauge (233), a second static mixer (234) and a water content sensor (235) in sequence along the flow direction of the liquid in the pipeline; The pipeline between the first static mixer (232) and the second static mixer (234) is a first transition pipeline (236); the diameter of the first transition pipeline (236) changes uniformly from large to small to a preset diameter, and the inner wall of the first transition pipeline (236) transitions smoothly; The controller (1) is respectively connected to the first electric valve (221) and the second electric valve (231) for control; the controller (1) is respectively connected to the pressure gauge (233) and the water content sensor (235) for communication; The pipe between the water content sensor (235) and the liquid outlet pipe (24) is a second transition pipe (237); The diameter of the second transition pipeline (237) gradually increases from a preset diameter and evenly transitions to the same diameter as the second pipeline (23); It also includes: a cleaning component (3) for cleaning the moisture content sensor (235); The cleaning component (3) comprises: a driving mechanism (31), a transmission mechanism (32) and a cleaning mechanism (33); The cleaning mechanism (33) is inserted into the pipe wall, one end of the cleaning mechanism (33) is connected to the transmission mechanism (32), and the other end has a cleaning ring (331); the cleaning ring (331) is sleeved on the probe of the water content sensor (235); The driving mechanism (31) drives the transmission mechanism (32) to reciprocate via an output shaft; the transmission mechanism (32) drives the cleaning ring (331) to reciprocate; The controller (1) is controllably connected to the driving mechanism (31); The cleaning mechanism (33) is in an I-shape and comprises: a limiting rod (332), a connecting rod (333) and a cleaning rod (334) which are connected in sequence; One end of the limiting rod (332) is connected to the driving mechanism (31), the connecting rod (333) is penetrated through the pipe wall, and one end of the cleaning rod (334) is provided with the cleaning ring (331); A first sealing ring (335) is provided between the connecting rod (333) and the pipe wall; a second sealing ring (336) is provided at a position of the cleaning rod (334) corresponding to the pipe wall; and a third sealing ring (337) is provided at a position of the limiting rod (332) corresponding to the pipe wall.

2. The device according to claim 1, characterized in that The cleaning ring (331) is an annular brush or rubber.

3. The device according to claim 1, characterized in that The controller (1) is a PLC controller or an industrial computer.

4. The device according to claim 3, characterized in that The controller (1) is also provided with a wireless communication module; the controller (1) is connected to a remote terminal via wireless communication.

5. The device according to claim 4, characterized in that The wireless communication module includes one or more of the following: WIFI module, public mobile communication network communication module, Bluetooth module and near field communication module.

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