CN216043646U - Underground communication device - Google Patents

Abstract

The utility model relates to an underground communication device, which comprises a shell, wherein a closed space is formed between the shell and an underground pump body; wherein: the pump body is connected with the lifting equipment through a rod body; the casing is provided with and is used for through changing the load of lifting equipment is with the valve body of transmission information, wherein, the valve body is according to can make confined space communicates or keeps apart with the external world thereby change the mode setting of the effort that the body of rod bore. Through the arrangement mode, the electromagnetic wave signal transmission device transmits the signal by using the working condition of the lifting equipment instead of transmitting the electromagnetic wave signal by using underground facilities such as the rod body, the pump body, the second sleeve and the like. Because electromagnetic waves are not used as information carriers, signals do not need to be transmitted through underground fluid or an underground sleeve, the defects of underground transmission attenuation and high interference are further avoided, and the reliability and the stability of ground and underground wireless communication are improved.

Description

Underground communication device

Technical Field

The utility model relates to the technical field of underground energy exploitation communication, in particular to an underground communication device.

Background

Because the oil field in China generally has the characteristics of multilayer and heterogeneity, in order to ensure that the oil field can be fully exploited, data monitoring and information transmission under the oil production well are very important. In particular, information transmission between the underground and the ground is an important research project in the fields of well logging, well drilling, oil extraction and the like, and has important significance for exploration and development of petroleum resources, exploration of the geological structure of an oil layer, testing of the state of an oil well and maintenance of sustainable utilization of resources.

At the present stage, the underground communication can adopt a wired mode and a wireless mode.

The wired method is to perform communication in the form of a power carrier or an optical carrier. However, the cable digital detection communication process needs to be constructed by binding cables in or out of the oil pipe, and has the problems of complex site construction operation, low construction efficiency, high difficulty in operation under pressure and the like.

The wireless mode is to communicate by adopting carriers such as wireless electromagnetic waves, sound waves, wellbore fluid and the like. Furthermore, the mining device itself can also be used as a medium for signal transmission. For example, chinese patent publication No. CN209942809U discloses a communication device while drilling based on metal hollow-core waveguides, which is characterized in that the interior of a drill rod is structurally designed, and holes and coatings are drilled to make an inner hole of a continuous drill rod become a metal hollow-core waveguide, and then the metal hollow-core waveguide is used as a transmission carrier to transmit downhole data. For example, chinese patent publication No. CN202810837U discloses an oil well downhole wireless communication device, which includes an uphole coding device and a downhole decoding device, wherein the uphole coding device transmits communication data through pressure pulses in an oil well casing and the downhole decoding device. The communication device realizes wireless communication through the coding and decoding device and pressure pulses transmitted in the oil well casing.

However, the fluid in the wellbore is in a non-uniform state in most cases due to the mud, scale, oil, water and air bubbles contained in the wellbore, and the communication method has the defects of poor reliability, short transmission distance, difficult maintenance and replacement and the like due to factors such as the formation, the drill string and the oil layer.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

SUMMERY OF THE UTILITY MODEL

At present, in the field of energy exploitation, downhole and surface communication generally adopts electromagnetic waves as carriers for information transmission, and fluids in a downhole casing or downhole equipment itself is used as a transmission medium. On one hand, however, the underground medium has more components, and the characteristics of the stratum and the oil layer are distributed in a complex way, so that the condition of non-uniformity exists; on the other hand, due to the severe high-temperature and high-pressure environment in the underground, electromagnetic waves are greatly attenuated and interfered in the underground transmission, signals are very weak when being transmitted to the ground or the underground, and the accurate extraction of the signals is very difficult due to the ground background noise and the underground high-frequency/low-frequency interference, so that the noise is difficult to filter even if the ultralow-frequency electromagnetic waves are used for communication. Further, compared with a wireless communication module arranged underground or on the ground, the wireless communication module takes wireless electromagnetic waves as carriers of information transmission, and long-distance transmission cannot be realized due to attenuation and interference.

In view of the above problems, the present invention provides a downhole communication device, comprising:

the casing, form airtight space between casing and the pump body in the pit. The pump body is connected with lifting equipment through a rod body. The housing is provided with a valve body for transmitting information by changing a load of the lifting device. The valve body is arranged in a mode that the closed space can be communicated or isolated with the outside so as to change the acting force borne by the rod body.

The utility model also provides a downhole communication device, which comprises a shell. The shell is connected with lifting equipment through the rod body. And a power generation element for acquiring information by identifying the motion state of the rod body is arranged in the shell. Preferably, the power generating element can also be used to transmit information by changing the load of the lifting device. The power generating element includes a rotor. The rotor is provided in such a manner as to be rotatable in accordance with the reciprocating motion of the rod body.

According to a preferred embodiment, the pump body comprises a first valve and a second valve. The shell is arranged on one side, facing the bottom of the well, of the second valve. Or the shell is arranged between the first valve and the second valve.

According to a preferred embodiment, the valve body in the housing and the second valve in the pump body are in communication with the enclosed space, respectively.

According to a preferred embodiment, the valve body in the housing and the first and second valves in the pump body are in communication with the enclosed space, respectively.

According to a preferred embodiment, the housing is arranged inside the second sleeve. The second sleeve is provided with a working oil port. The shell is provided with a first channel which can be communicated with the working oil port and the closed space.

According to a preferred embodiment, the housing is provided with a second channel for insertion of the rod.

According to a preferred embodiment, the end of the rod body is provided with a lead screw. The rotor in the housing is arranged in such a way that it can surround the spindle.

According to a preferred embodiment, a control unit is provided in the housing, which is electrically connected to the valve body or the power generating element.

According to a preferred embodiment, a plug is arranged in the housing for plugging the second channel so as to form a closed space with the pump body.

The beneficial technical effects of the utility model are one or more of the following:

1. compared with the conventional monthly test indicator diagram and working fluid level of the oil field in China or the monitoring of underground data through a cable, the underground communication device can realize the information transmission from the underground to the ground only by connecting the pump body and monitoring the load change of the lifting equipment on the ground, and the cable is not required to be put into the underground communication device, so that the underground communication device has the characteristics of high efficiency, manpower and material resource saving, simple structure, simple and convenient field construction, low cost, operation under pressure and the like, and has wide application prospect;

2. the load of the lifting equipment is changed by opening or closing the valve body, namely the acting force borne by the pump body when the rod body reciprocates is changed by the valve body, and finally the load of the lifting equipment is changed, namely the working condition of the lifting equipment is utilized to transmit signals, and the rod body, the pump body, the second sleeve and other underground facilities are not utilized to transmit electromagnetic wave signals. Because electromagnetic waves are not used as information carriers, signals do not need to be transmitted through underground fluid or an underground sleeve, the defects of underground transmission attenuation and large interference are further avoided, and the reliability and the stability of ground and underground wireless communication are improved;

3. the underground communication device provided by the utility model can transmit the underground parameters to the ground in real time, so that the oil extraction process parameters of the oil extraction well are optimized in real time, the problems of inconsistent supply and discharge of the oil extraction well and the like are effectively solved, meanwhile, the system efficiency is obviously improved, the service life is prolonged, and the potential of the oil well can be furthest excavated. And moreover, a basic technical guarantee is provided for realizing the digital fine development of the oil production well, the digital transformation of the oil and gas field and the benefit development, and a big data support is provided for the construction of the intelligent oil field.

Drawings

FIG. 1 is a schematic diagram of a downhole deployment of a preferred embodiment of a downhole communication device of the present invention;

FIG. 2 is a schematic diagram of a preferred embodiment of a downhole communication device of the present invention;

FIG. 3 is a schematic structural view of another preferred embodiment of a downhole communication device of the present invention;

fig. 4 is a schematic structural view of a preferred embodiment of the power generating element of the present invention.

List of reference numerals

100: downhole communication device 200: the pump body 300: closed space

400: rod body 500: lifting the device 600: first sleeve

700: the second sleeve 800: oil layer 101: shell body

102: valve body 103: working oil port 104: power generating element

105: first passage 106: second passage 107: valve body assembly

108: and (3) a plug 109: outer cylinder 110: first joint

111: the thread passing rod 112: circuit isolation cylinder 113: second joint

114: power generation element housing 115: inner cylinder 116: first bearing outer ring

117: second bearing outer ring 118: bearing joint 119: third joint

1071: a motor 201: first valve 202: the second valve

203: the pump barrel 204: oil outlet chamber 401: screw rod

510: the ground control device 610: first annulus 620: second annular space

1041: stator 1042: rotor

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

Example 1

The underground communication device provided by the utility model can be applied to underground and ground communication or ground and underground communication in an energy exploitation environment. For example, the utility model can be applied to oil production wells, coal mines, natural gas wells, offshore oil and gas exploitation, desert oil and gas exploitation and other application scenes similar to underground energy exploitation. In particular, the energy source may be a fluid, such as crude oil, water, a solid-liquid mixture (mud), or the like. The energy source may also be a gas, such as natural gas, coal bed gas, or the like.

The structure and working principle of the utility model are explained below by taking oil well exploitation as an example.

Referring to fig. 1, oil and gas production from an oil well is divided into a surface portion and a downhole portion. In particular, the ground portion is provided with a lifting device 500 and a ground control device 510. Preferably, the lifting device 500 may be a beam pumping unit or a walking beam-free pumping unit. The beamless pumping unit can be a chain type pumping unit, a steel rope pumping unit, a hydraulic type pumping unit, a crank connecting rod type pumping unit and the like. The lifting apparatus 500 may also be a walking beam air extractor or a walking beam-less air extractor. The lifting device 500 may be driven by a work-doing device, such as a lifting motor, an oil-fired machine, a hydraulic motor, and the like. Preferably, the ground control device 510 includes a master control board. Preferably, the main control board can process the data and control the work doing device to start, stop, rotate speed and the like through the work doing device controller. Preferably, the surface control apparatus 510 further includes a work device controller. For example, if the lifting apparatus 500 is driven by a lifting motor, the work implement controller may be a motor variable frequency controller. Preferably, the surface control device 510 may also include a power module. Preferably, the power module is configured to convert 220Vac ac power into 24Vdc dc power, so as to supply power to a device such as a main control board or a work-doing device controller.

Referring to fig. 1, the downhole portion includes a pump body 200, a rod body 400, a first sleeve 600, and a second sleeve 700. The first casing 600 is disposed below the ground surface in a manner substantially perpendicular to the ground surface. The first casing 600 may pass through the oil layer 800. The second sleeve 700 is located within the first sleeve 600. The portion between the first casing 600 and the second casing 700 is an annulus. The annulus may be divided into a first annulus 610 and a second annulus 620 in different locations. Preferably, the area near the surface or pump body 200 is a first annulus 610, see FIG. 2. Preferably, the annulus proximate the zone of reservoir 800 is a second annulus 620, see FIG. 2.

Preferably, the lifting device 500 is connected to the pump body 200 by means of a rod 400. Referring to fig. 1, pump body 200 and rod 400 are disposed within second sleeve 700. Preferably, the principle of the lifting device 500 to extract/lift oil bodies or gases is:

the lifting apparatus 500 is connected to the rod body 400 and can drive the rod body 400 to reciprocate up and down. The rod body is connected with the pump barrel 203 of the pump body 200 and can drive the pump barrel 203 of the pump body 200 to reciprocate up and down, so that the fluid in the oil layer 800 is pumped in and the fluid is lifted to the ground. Preferably, the up and down reciprocating motion of the lifting device 500, the rod body 400 and the pump body 200 means the axial movement along the second sleeve 700. The upward movement refers to a direction of movement toward the ground side. The downward movement refers to a direction of movement toward the side of the bottom hole. Preferably, the up-and-down reciprocating motion can also be represented by an up stroke and a down stroke. The upstroke means that the lifting apparatus 500, the rod body 400 or the pump barrel 203 moves toward the ground side along the axis of the second sleeve 700. The down stroke refers to the lifting apparatus 500, the rod body 400, or the pump barrel 203 moving toward the side of the bottom hole along the axis of the second casing 700. For ease of description, the upstroke of the present invention may be in a first direction and the downstroke may be in a second direction. The first direction is a direction toward the ground side. The second direction is a direction toward a side of the bottom hole.

Preferably, the pump body 200 may be a tube pump or a rod pump. Referring to fig. 2 and 3, the pump body 200 includes a first valve 201, a second valve 202, and a pump barrel 203. The first valve 201 and the second valve 202 may be valves, such as a check valve, a traveling valve, or a fixed valve. The operating principle of pump body 200 is:

when the lifting device 500 drives the pump barrel 203 to move along the first direction (upstroke) through the rod 400, the first valve 201 is closed, the second valve 202 is opened, the pressure of the oil outlet chamber 204 is reduced, and the fluid in the second annular space 620 can enter the oil outlet chamber 204 through the second valve 202.

When the lifting device 500 drives the pump barrel 203 to move in the second direction (down stroke) through the rod 400, the first valve 201 is opened and the second valve 202 is closed. Since the second valve 202 is closed, the pressure of the oil outlet chamber 204 is increased, and the first valve 201 is further opened, so that the fluid in the oil outlet chamber 204 can enter the pump barrel 203, and the fluid entering the pump barrel 203 can be lifted to the ground.

Preferably, one end of the rod body 400 is connected with the lifting apparatus 500, and the other end is connected with the pump barrel 203. Preferably, the rod body 400 may be an elongated body that is flexible or rigid. For example, the rod 400 may be a sucker rod, a steel cable, or a chain.

Preferably, referring to fig. 1, 2 and 3, the downhole communication device 100 provided by the utility model is arranged in a well, and forms a closed space 300 with the pump body 200. In particular, the downhole communication device 100 comprises a housing 101, see fig. 2 and 3. Housing 101 can form sealed space 300 with pump body 200. A valve body 102 is provided in the housing 101. The valve body 102 is disposed between the enclosed space 300 and the outer annulus. The valve body 102 can communicate the closed space 300 with the outside. The valve body 102 can also isolate the enclosed space 300 from the outside. Preferably, the valve body 102 may be a mechanical device capable of changing the degree of communication between the enclosed space 300 and the outside, such as a movable valve, a control valve body, a check valve, an electric valve, a high-pressure ball valve, etc. Preferably, the valve body 102 may also be a membrane valve body. Through the arrangement mode, when the lifting device 500 drives the pump barrel 203 to move along the first direction or the second direction, the valve body 102 is forcibly opened or closed, so that the closed space 300 is forcibly communicated or isolated with the outside, and the acting force on the rod body 400 during normal operation of the pump body 200 can be changed. Since the rod 400 is driven by the lifting device 500, when the acting force of the pump body 200 on the rod 400 changes, the acting force applied by the lifting device 500 to drive the rod 400 to reciprocate also changes, so that the load of the lifting device 500 changes compared with the load during normal operation. In the event of a load change of the lifting device 500, the ground portion can obtain the operating state of the valve body 102 by monitoring the load of the lifting device 500 through the ground control device 510. For example, when the lifting device 500 is driven by a lifting motor, the load of the lifting device 500 changes, and the power of the lifting motor changes, so the surface control device 510 can obtain the operating condition of the valve body 102 in the downhole communication device 100 by monitoring the power of the lifting motor. Based on the above working principle, the downhole communication device 100 of the present invention can send a signal by driving the valve body 102 to open or close, thereby realizing the downhole information transmission to the ground.

Through the above setting mode, the beneficial effect who reaches is:

the load of the lifting equipment 500 is changed by opening or closing the valve body 102, that is, the acting force borne by the pump body 200 when reciprocating the rod body 400 is changed by the valve body 102, and finally the load of the lifting equipment 500 is changed, namely, the working condition of the lifting equipment 500 is utilized to transmit signals, but the rod body 400, the pump body 200, the second casing 700 and other underground facilities are not utilized to transmit electromagnetic wave signals. Because electromagnetic waves are not used as information carriers, signals do not need to be transmitted through underground fluid or an underground sleeve, the defects of underground transmission attenuation and high interference are further avoided, and the reliability and the stability of ground and underground wireless communication are improved. In addition, wireless communication technologies such as Zigbee, Bluetooth and radio frequency adopted at the present stage are seriously attenuated under the underground working condition, and long-distance transmission cannot be realized. The utility model can realize the remote information transmission from the underground to the ground. The distance of information transmission is determined by the depth of the underground, and theoretically, the distance of information transmission is not limited, and the underground and surface communication with the distance of more than 1000m can be realized in the embodiment.

Example 2

This embodiment is a further supplement and/or description to embodiment 1, and repeated contents are not described again.

Preferably, the downhole communication device 100 of the present invention may be disposed outside the pump body 200. The downhole communication device 100 may be disposed within the second casing 700. Referring to fig. 2, the downhole communication device 100 is disposed on the side of the second valve 202 facing downhole.

Preferably, the housing 101 of the downhole communication device 100 is located within the second casing 700. Preferably, the housing 101 may be substantially cylindrical. The housing 101 may also be a polygonal body, such as a cube, cuboid, cylinder, etc., that can be placed within the second sleeve 700. Preferably, the housing 101 can abut against the inside of the second sleeve 700 at least at the end near the second valve 202 to form the closed space 300.

Preferably, a closed space 300 is formed between the housing 101 and the second valve 202. Preferably, the second sleeve 700 is provided with the working oil port 103. A first passage 105 communicating the sealed space 300 and the working oil port 103 is provided in the housing 101.

Preferably, a valve body 102 is provided within the housing 101. The valve body 102 may be disposed at the working oil port 103. The valve body 102 may also be disposed within or at both ends of the first passageway 105. The two ends of the first passage 105 refer to the end of the first passage 105 communicated with the working oil port 103 and the end of the first passage 105 facing the enclosed space 300, respectively, see fig. 2.

Preferably, a control unit is also provided within the housing 101. The control unit is used for data processing and instruction sending. Disposed within housing 101 is valve body assembly 107. The valve body assembly 107 includes a motor 1071 and a motor driving unit. The control unit is electrically connected with the motor driving unit. The control Unit may be a control Circuit, a Micro Control Unit (MCU), a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Graphics Processing Unit (GPU), or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof.

Preferably, the motor driving unit is connected with the motor 1071. The motor drive unit may be a motor drive, for example a brushed motor drive of model TB67H450 FN. Preferably, the motor 1071 is connected to the valve body 102. Preferably, the motor 1071 may be a brushless motor. The motor 1071 can drive the valve body 102 to open or close. Valve body 102 may be a nipple.

With the above arrangement, the closing valve body 102 can forcibly shut off the communication between the oil outlet chamber 204 and the annulus. The specific principle is as follows:

referring to fig. 2, the valve body 102 disposed in the housing 101 is equivalent to be connected in series with the second valve 202, that is, the oil outlet chamber 204 can be communicated with the outside (annulus) only when the second valve 202 and the valve body 102 are opened simultaneously. When only the second valve 202 or the valve body 102 is opened, the oil outlet chamber 204 cannot communicate with the outside (annulus). Specifically, as shown in fig. 2, the oil outlet chamber 204 needs to be communicated with the outside (annulus) through the sealed space 300, so when the sealed space 300 is not communicated with the outside (annulus), the oil outlet chamber 204 cannot be communicated with the outside (annulus) no matter whether the second valve 202 is opened or not, that is, the closing valve body 102 can forcibly close off the communication between the oil outlet chamber 204 and the outside (annulus).

Preferably, the forced closing of the oil outlet chamber 204 by the valve body 102 to communicate with the outside (annulus) can change the acting force of the pump body 200 on the rod body 400, and thus change the load of the lifting device 500. The specific principle is as follows:

in the event that communication is not required, the valve body 102 is in an open state. When the lifting device 500 drives the pump barrel 203 to move in a first direction (upstroke) through the rod 400, the first valve 201 is closed to reduce the pressure of the oil outlet chamber 204, so that the second valve 202 is opened. When the second valve 202 is opened, the fluid in the annulus enters the oil outlet chamber 204 through the valve body 102 and the second valve 202, and the load of the lifting device 500 is the normal lifting load.

In the event communication is desired, communication may be achieved by closing the valve body 102. Specifically, in the case that the lifting device 500 drives the pump barrel 203 to move in the first direction (upstroke) through the rod 400, if the valve body 102 is closed, the oil outlet chamber 204 is a closed chamber, and the pump is pumped down during lifting, so that the pressure under the pump is reduced, resulting in an increase in the load of the lifting device 500. An increase in the load on the lifting apparatus 500 results in an increase in the power of the lifting motor, and thus the downhole communication device 100 may effect a transmission of information from downhole to surface by closing the valve body 102 to change the power of the lifting apparatus 500.

Example 3

This embodiment is a further supplement and/or description to embodiments 1 and 2 and their combinations, and repeated contents are not repeated.

Preferably, the downhole communication device 100 may be disposed within the pump body 200. Referring to fig. 3, the downhole communication device 100 is disposed between a first valve 201 and a second valve 202 of the pump body 200. The housing 101 is located in a chamber formed by the first valve 201 and the second valve 202. This chamber is an oil outlet chamber 204, and a sealed space 300 is formed between the housing 101 and the pump body 200.

Specifically, referring to fig. 3, the housing 101 is disposed between a first valve 201 and a second valve 202. The housing 101 is provided with a first passage 105 for communicating the sealed space 300 with the working oil port 103, and a valve body 102 is provided in the first passage 105 or at an end portion thereof.

With the above arrangement, opening the valve body 102 can forcibly connect the oil outlet chamber 204 with the outside (annulus). The specific principle is as follows:

referring to fig. 3, the housing 101 is disposed between the first valve 201 and the second valve 202, that is, the sealed space 300 formed by the housing 101 and the pump body 200 is the oil outlet chamber 204 of the pump body 200, so the valve body 102 is equivalent to be connected in parallel with the second valve 202, that is, when the valve body 101 or the second valve 202 is opened, the oil outlet chamber 204 can be communicated with the outside (annulus). Specifically, as shown in fig. 3, when the second valve 202 is closed, opening the valve body 102 can forcibly communicate the oil outlet chamber 204 with the outside (annulus).

Preferably, the forced communication of the oil outlet chamber 204 with the outside (annulus) through the valve body 102 can change the acting force of the pump body 200 on the rod body 400, and further change the load of the lifting device 500. The specific principle is as follows:

in the case where communication is not required, that is, when the pump body 200 and the lifting device 500 are in the normal operating state, the valve body 102 is in the closed state. In the case where the lifting apparatus 500 drives the pump barrel 203 to move in the second direction (down stroke) through the rod body 400, the second valve 202 is closed, so that the pressure of the oil outlet chamber 204, i.e., the enclosed space 300, is increased. The pressure of the oil outlet chamber 204 (the sealed space 300) is increased, so that the first valve 201 is opened, and the fluid in the oil outlet chamber 204 enters the pump through the first valve 201, at this time, the load of the lifting device 500 can be simplified to the gravity borne by the rod body 400.

If the valve body 102 is opened when the lifting device 500 drives the pump barrel 203 to move in the second direction (down stroke) through the rod 400, the fluid flows back to the annulus through the valve body 102 when the pressure of the oil outlet chamber 204 increases. The fluid flows back to the annulus through the valve body 102, which may cause the first valve 201 to be unable to open, and at this time, the load of the lifting equipment 500 is the pressure difference between the pump barrel 203 and the annulus, so that the load of the lifting equipment 500 is increased, and the power of the lifting motor is increased. Accordingly, the downhole communication device 100 may enable downhole communication to the surface by opening the valve body 102 to vary the power of the lifting apparatus 500.

Example 4

This embodiment is a further supplement and/or description to embodiments 1, 2, and 3 and their combinations, and repeated details are not repeated.

Preferably, a power generation element 104 is also provided within the housing 101. The power generation element 104 is used for generating power. The power generating element 104 is capable of providing power to the downhole communication device 100. Preferably, the power generation element 104 can also be used to receive surface-to-downhole transmitted information. Preferably, the power generating element 104 can also be used to change the load of the lifting device 500, thereby transmitting information to the ground.

Preferably, a built-in battery is provided within the housing 101. The power generating element 104 may charge an internal battery. The internal battery may power the electrical components within the housing 101. The electric components inside the housing 101 include at least a control unit, a motor drive unit, a motor 1071, and the like. The built-in battery may be a high temperature resistant battery or a high temperature resistant battery pack. The internal battery is electrically connected to the power generation element 104. Preferably, the power generation element 104 may not supply power to the electrical elements within the housing 101 through a built-in battery. For example, the power generation element 104 may be electrically connected to the electric elements inside the housing 101 through a voltage conversion circuit. The voltage conversion circuit may be a DC-DC voltage conversion circuit. The voltage conversion circuit may be a BUCK conversion circuit, such as a BUCK circuit. The voltage conversion circuit may also be a BOOST conversion circuit, such as a BOOST circuit. For example, the power generating element 104 may be electrically connected to the electrical elements within the housing 101 through a voltage converter device. The voltage converting device may be a DC-DC converter. The power generation element 104 may output an ac current as a dc current through an ac-dc converter, thereby supplying power to the electric elements in the housing 101.

Preferably, referring to fig. 4, the housing 101 is provided with a second channel 106 into which the rod body 400 is inserted. Preferably, the wand 400 may be passed through the pump barrel 203 into the housing 101. Preferably, the rod body 400 may also not pass through the pump barrel 203. In the case where the rod 400 does not pass through the barrel 203, an elongated member similar to the rod 400 is attached to the end of the barrel 203. The elongated element may enter the housing 101. The rod 400 or elongated member may enter the second channel 106. Preferably, the rod 400 or the portion of the elongated member inserted into the second channel 106 may be a lead screw 401. The lead screw 401 can drive the rotor 1042 of the power generation element 104 to rotate.

Preferably, the power generating element 104 comprises at least a stator 1041 and a rotor 1042, see fig. 4. The rotor 1042 is located within the stator 1041. Preferably, the lead screw 401 is capable of rotating the rotor 1042. Specifically, the surface of the lead screw 401 is provided with a spiral groove, and the rotor 1042 can be inserted into the groove of the lead screw 401. In the case that the lead screw 401 moves in the first direction or the second direction, the groove of the lead screw 401 can drive the rotor 1042 to rotate. When the rotor 1042 rotates, the magnetic field generated by the stator 1041 is cut to generate electricity. More specifically, the radial direction of the rotor 1042 is provided with a protruding convex body. The protrusion can snap into a groove of the lead screw 401, see fig. 4. Preferably, the convex body may be a pin.

It should be noted that, for the lead screw 401 driving the rotor 1042 to rotate, the lead screw 401 may be provided with a spiral protrusion instead of a spiral groove, and the rotor 1042 is provided with a groove matching the protrusion.

Preferably, the control unit is electrically connected to the power generating element 104. Preferably, the power generation element 104 is connected to the electric elements inside the housing 101 through a switching element or a switching circuit. The control unit is electrically connected to the switching element or the switching circuit. Preferably, the switching element may be an electrical element such as a relay, a solenoid valve, a MOS transistor, or the like. The switching circuit may be a switching circuit formed of a semiconductor device. The semiconductor device may be a diode, a triode, a field effect transistor, or the like.

Through the above setting mode, the beneficial effect who reaches is:

in one aspect, the power generating element 104 is capable of providing power to the downhole communication device 100; on the other hand, the downhole communication device 100 may be capable of receiving information transmitted at the surface via the power generation element 104. In particular, the ground control device 510 located at the ground portion can change the motion state of the lifting device 500, for example, the lifting device 500 can be moved in a first direction, or the lifting device 500 can be moved in a second direction, or the lifting device 500 can be stopped, i.e., the ground control device 510 can send a message by the change of the motion state of the lifting device 500. Since the lifting device 500 is connected to the rod 400 and the rod 400 is connected to the elongated member through the pump barrel 203, the change of the motion state of the lifting device 500 is transmitted to the rod 400 or the elongated member. When the motion state of the rod 400 or the elongated element changes, the rotation speed and the direction of the rotor 1042 of the power generation element 104 are changed, so the motion state of the rod 400 or the elongated element can be identified through parameters such as the phase sequence, the frequency, the voltage and the like of the power generation element 104, and further the change of the motion state of the lifting device 500 is identified, so as to acquire the information sent by the ground control device 510. Specifically, the power generating element 104 may be a three-phase motor, and the control unit detects a phase of each phase through an isolation optocoupler, determines a moving direction of the lifting device 500 according to the phase difference, and may further detect a rotation speed of the rotor 1042 according to a frequency. Furthermore, if no voltage or current is generated by the power generating element 104, the lifting device 500 is in a stopped state.

In yet another aspect, the power generation element 104 can also change the load of the lifting device 500, thereby transmitting information to the ground, i.e. the power generation element 104 can have a similar function as the valve body 102. Specifically, when the power generating element 104 is electrically connected to the electrical element in the housing 101 (after being connected to a load), a current is generated to generate a resistance to the rotation of the rotor 1042, so that the control unit can change the power of the power generating element 104 by changing the load connected to the power generating element 104, and further change the resistance to the movement of the lead screw 401, thereby changing the load of the lifting device 500. With this arrangement, the downhole communication device 100 is able to transmit information to the surface.

Preferably, the housing 101 is also provided with a plug 108. The plug 108 is used to close the second passage 106, so that the housing 101 can form a closed space 300 with the pump body 200, see fig. 1 and 2.

Preferably, referring to fig. 4, the housing 101 includes an outer cylinder 109, a first joint 110, an opening, a threading rod 111, a circuit isolation cylinder 112, a second joint 113, a power generation element housing 114, an inner cylinder 115, a first bearing outer ring 116, a second bearing outer ring 117, a bearing joint 118, and a third joint 119. The downhole communication device 100 internal components are disposed within the outer barrel 109. The housing 101 is provided with a first joint 110. The first connector 110 may be used to connect the second casing 700. The first connector 110 is connected to the outer cylinder 109 at an end opposite the second sleeve 700. An opening communicating with the hydraulic fluid port 103 is provided on one side of the outer cylinder 109. The first joint 110 is provided with a thread passing bar 111 along the second direction. The wire penetrating rod 111 is used for penetrating and sealing the cable inside the downhole communication device 100. One end of the threading rod 111 is connected to the first joint 110, and the other end is connected to the circuit isolation tube 112. A valve body assembly 107 is provided on the side opposite to the thread passing rod 111. Valve body assembly 107 is connected at one end to first connector 110 and at the other end to circuit isolation cartridge 112. The circuit isolation cylinder 112 is used to enclose a space to isolate a flow of liquid and to support a circuit board. The control unit may be provided on a circuit board. One end of the circuit isolation cylinder 112 is also hermetically connected to the outer cylinder 109. The enclosed space formed between the circuit isolating cylinder 112 and the outer cylinder 109 is used for accommodating a circuit board. One end of the circuit isolating cylinder 112 in the second direction is hermetically connected with a second joint 113. Specifically, the side of the circuit isolation tube 112 facing the well bottom is provided with a second joint 113. One end of the second joint 113 is detachably connected to the outer cylinder 109. The detachable connection may be a threaded connection, a snap connection, a hinge, a weld, etc. The second joint 113 is detachably connected to the power generating element case 114 at the other end opposite to the outer cylinder 109. The power generation element housing 114 serves to house the power generation element 104. The second joint 113 is used to connect the power generation element 104 and the valve body assembly 107. Preferably, the second joint 113 can also be traversed by a cable. Preferably, the second joint 113 is provided with an inner cylinder 115 on the side facing the bottom of the well. One end of the inner cylinder 115 is connected to the second joint 113. An end of the inner cylinder 115 opposite to the second joint 113 is connected to the stator 1041. The inner cartridge 115 serves as a fluid center channel to isolate fluid flow and serves as a stationary inner cartridge for the internal battery assembly. The side of the inner drum 115 facing the bottom of the well is provided with a power generation element housing 114. The power generation element 104 surrounds the lead screw 401. Specifically, the stator 1041 serves to generate a rotating magnetic field. A rotor 1042 is provided inside the stator 1041. The rotor 1042 is used for cutting the magnetic field generated by the stator 1041 to generate electric energy. Further, the rotor 1042 is connected to the stator 1041 through the first bearing outer ring 116 and the second bearing outer ring 117. One end of the rotor 1042 is hinged to the stator 1041 through the first bearing outer ring 116, and the other end is hinged to the stator 1041 through the second bearing outer ring 117. The side of second bearing outer ring 117 opposite rotor 1042 is connected to bearing adapter 118. The end of the bearing joint 118 opposite the second bearing outer ring 117 is connected to a third joint 119. The third joint 119 is connected at one end to the power generating element case 114 and at the other end to the second sleeve 700. The third joint 119 is used to fix the power generating element case 114.

Example 5

This embodiment is a further supplement and/or description to embodiments 1, 2, 3, 4 and their combinations, and repeated contents are not repeated.

Preferably, the electrical components within the housing 101 also include sensors. The sensors are used to monitor the downhole environment, pump body 200 operating parameters, and rod body 400 operating parameters. The sensors may include flow sensors, temperature sensors, pressure sensors, and moisture content sensors. Preferably, the control unit is electrically connected to the sensor. Preferably, the built-in battery may power the sensor. Preferably, the power generating element 104 may power the sensor. With this arrangement, the downhole communication device 100 may transmit data monitored by the sensors to the surface. For example, after the control unit acquires the data detected by the sensor, the data may be encoded according to a preset encoding program. When communication is required, the control unit transmits the coding instruction to the motor driving unit. The motor driving unit drives the motor to open or close the valve body 102 according to the coded command, so that the data detected by the sensor is uploaded to the ground.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the utility model. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the utility model is defined by the claims and their equivalents.

The present description contains several inventive concepts, and the applicant reserves the right to submit divisional applications according to each inventive concept. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all indicating that the respective paragraphs disclose an independent concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims (10)

1. A downhole communication device, comprising:

a housing (101), wherein a closed space (300) is formed between the housing (101) and a pump body (200) in a downhole;

wherein:

the pump body (200) is connected with a lifting device (500) through a rod body (400);

the housing (101) is provided with a valve body (102) for transmitting information by changing the load of the lifting device (500), wherein,

the valve body (102) is arranged in a manner that the closed space (300) can be communicated or isolated with the outside so as to change the acting force borne by the rod body (400).

2. A downhole communication device comprising a housing (101), wherein:

the shell (101) is connected with a lifting device (500) through a rod body (400);

a power generation element (104) for acquiring information by identifying the motion state of the rod body (400) or transmitting information by changing the load of the lifting device (500) is arranged in the shell (101), wherein,

the power generation element (104) comprises a rotor (1042), and the rotor (1042) is arranged in a manner of rotating along with the reciprocating motion of the rod body (400).

3. Downhole communication device according to claim 1 or 2, wherein the pump body (200) comprises a first valve (201) and a second valve (202), wherein,

the shell (101) is arranged on one side, facing the bottom of the well, of the second valve (202);

or

The shell (101) is arranged between the first valve (201) and the second valve (202).

4. A downhole communication device according to claim 1 or 2, wherein the valve body (102) in the housing (101) and the second valve (202) in the pump body (200) communicate with the confined space (300), respectively.

5. A downhole communication device according to claim 1 or 2, wherein the valve body (102) in the housing (101) and the first and second valves (201, 202) in the pump body (200) communicate with the confined space (300), respectively.

6. A downhole communication device according to claim 1 or 2, wherein the housing (101) is arranged in a second casing (700), wherein,

the second sleeve (700) is provided with a working oil port (103);

the shell (101) is provided with a first channel (105) which can be communicated with the working oil port (103) and the closed space (300).

7. A downhole communication device according to claim 1 or 2, wherein the housing (101) is provided with a second passage (106) for insertion of the rod (400).

8. Downhole communication device according to claim 1 or 2, wherein the end of the rod body (400) is provided with a lead screw (401), wherein,

a rotor (1042) in the housing (101) is arranged so as to be able to surround the spindle (401).

9. A downhole communication device according to claim 1 or 2, wherein a control unit is arranged in the housing (101) and is electrically connected to the valve body (102) or the power generating element (104).

10. A downhole communication device according to claim 1 or 2, wherein a plug (108) is arranged in the housing (101) for plugging the second passage (106) to enable a closed space (300) to be formed with the pump body (200).

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