CN218334501U

CN218334501U - Wellhead signal adapter for geothermal well

Info

Publication number: CN218334501U
Application number: CN202222367566.0U
Authority: CN
Inventors: 胡振阳; 俞强; 赵永哲; 张卫东; 栗子剑; 谷宜豪; 张益超
Original assignee: XI'AN RESEARCH INSTITUTE OF CHINA COAL RESEARCH INSTITUTE
Current assignee: XI'AN RESEARCH INSTITUTE OF CHINA COAL RESEARCH INSTITUTE
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-01-17
Anticipated expiration: 2032-09-06

Abstract

The utility model provides a wellhead signal adapter of a geothermal well, which comprises an outer pipe, wherein a heat insulation bush is arranged in the outer pipe, and a core pipe is coaxially arranged in the heat insulation bush; the two ends of the core pipe extend out of the outer pipe, one end of the core pipe is fixedly connected with a flange plate, the two axial ends of the core pipe are both open, and the space in the core pipe is a heat transfer medium conveying channel. The outer pipe is provided with a socket, one axial end of the heat insulation lining is close to the socket, and a temperature sensor conducting ring and a cable conducting ring are arranged outside the other axial end of the heat insulation lining; a temperature sensor connecting wire and a cable connecting wire are arranged in the heat insulation lining, the socket and the temperature sensor connecting wire are connected with the temperature sensor conducting ring, and the socket and the cable connecting wire are connected with the cable conducting ring. The utility model discloses a geothermal well head signal adapter because temperature sensor connecting wire and cable connecting wire bury underground at thermal-insulated bush, consequently be difficult for receiving temperature and mechanical influence and damage, realized that temperature signal's stable transmission is measured.

Description

Wellhead signal adapter for geothermal well

Technical Field

The utility model belongs to the technical field of geothermal energy development equipment, a well deep geothermal well geothermal field monitoring devices is related to, concretely relates to geothermal well mouth signal adapter.

Background

The geothermal energy is a clean renewable energy source, and the mainstream modes for developing and utilizing the geothermal energy mainly include a shallow ground source heat pump, a middle-deep hydrothermal type, a middle-deep heat exchange type and a dry hot rock geothermal energy, wherein the middle-deep geothermal energy has a great development potential and becomes a main direction for developing the geothermal energy.

The main process of the development of the geothermal energy of the middle-deep layer is as follows: the heat exchange device is in contact with a rock-soil body through the external heat exchanger to transfer heat, then hot fluid is output through the built-in heat-preservation inner pipe, the hot fluid performs energy transfer through the heat exchange station to form circulation, the heat transfer process among the hot fluid, the pipe wall of the heat exchanger and surrounding rock-soil is a complex unsteady heat transfer process, and in the unsteady heat transfer process, the heat exchange characteristic can be influenced by thermal physical parameters of the rock-soil and a ground temperature field, so that the ground temperature field needs to be monitored during development of middle-deep geothermal energy.

The main modes of monitoring the geothermal well ground temperature field in the middle-deep layer are as follows: the method comprises the steps of burying a ground heat exchanger in a geothermal well, installing temperature sensors on the inner pipe wall and the outer pipe wall of the ground heat exchanger, realizing long-time dynamic temperature measurement through the temperature sensors, wherein the temperature sensors usually adopt distributed optical fiber sensors or digital temperature sensors, and the two types of sensors need to be connected with a ground signal processor through optical fiber cables or cables for data transmission, storage and analysis.

When the ground temperature field monitoring system is used in actual construction, the following problems mainly exist: firstly, the connection between the ground signal processor and the main temperature measuring cable is exposed in the geothermal well for a long time, and is easily damaged by various environmental factors such as high temperature, high pressure, corrosion, oxidation, hydrogen loss, magnetic field interference, radiation and the like, so that the signal transmission is unstable or even interrupted. Secondly, the connecting lines among the temperature sensor, the temperature measuring optical cable or cable, the heat exchanger and the ground signal processor are complex, and the temperature measuring optical cable is easy to damage due to careless operation during field installation, so that the installation failure of the ground temperature field monitoring system is caused.

Disclosure of Invention

The defect that exists to prior art and not enough, the utility model aims at providing a geothermal well head signal adapter, solve prior art and carry out deep geothermal well geothermal field monitoring time measuring, because the junction fragile of ground signal processor and temperature measurement main cable leads to the technical problem that signal transmission is unstable or even breaks.

In order to solve the technical problem, the utility model discloses a following technical scheme realizes:

the utility model provides a geothermal well head signal adapter, includes the outer tube, the axial both ends of outer tube are all opened, the space in the outer tube from left to right be first cavity, second cavity and third cavity in proper order, from left to right be provided with first step and second step on the inner wall of outer tube, first step is located the juncture of first cavity and second cavity, the second step is located the juncture of second cavity and third cavity.

A heat insulation lining is arranged in the third cavity, and a core pipe is coaxially arranged in the heat insulation lining; one end of the core pipe penetrates through the first cavity and the second cavity and extends out of one end of the outer pipe, one end of the core pipe extending out of the outer pipe is fixedly connected with a flange plate, and the other end of the core pipe penetrates through the heat insulation lining and extends out of the other end of the outer pipe; the axial two ends of the core tube are both open, and the space in the core tube is a heat transfer medium conveying channel.

The outer pipe is provided with a socket, one axial end of the heat insulation lining is close to the socket, and a temperature sensor conducting ring and a cable conducting ring are arranged outside the other axial end of the heat insulation lining; a first wire passing hole and a second wire passing hole are formed in the heat insulation lining along the axial direction, a temperature sensor connecting wire is arranged in the first wire passing hole, and a cable connecting wire is arranged in the second wire passing hole.

Temperature sensor connecting wire and cable connecting wire's one end all be connected with the socket, the other end of temperature sensor connecting wire passes first walking the line hole and is connected with the temperature sensor conducting ring, the other end of cable connecting wire passes the second and walks the line hole and be connected with the cable conducting ring.

The utility model discloses still have following technical characteristic:

the outer pipe is sequentially provided with a heat insulation layer setting section, an outer pipe main body section and a heat insulation pipe connecting section from left to right, a first shaft shoulder of the outer pipe is arranged at the end face of one end of the outer pipe main body section, and a second shaft shoulder of the outer pipe is arranged at the end face of the other end of the outer pipe main body section; the socket is arranged at the outer tube main body section.

An outer heat-insulating layer is arranged outside the heat-insulating layer setting section, one end of the outer heat-insulating layer exceeds one end of the outer pipe and covers the outer part of the core pipe, and the other end of the outer heat-insulating layer is close to the first shaft shoulder of the outer pipe.

The outer surface of the heat preservation pipe connecting section is provided with heat preservation pipe connecting threads.

And a plurality of sealing rings are arranged outside the other end of the core pipe.

The flange plate comprises a flange plate main body fixedly connected with the core pipe, a flange plate central through hole is formed in the middle of the flange plate main body, and a plurality of bolt holes are formed in the flange plate around the flange plate central through hole.

The socket comprises a socket main body arranged on the outer pipe, a plurality of socket mounting holes are formed in the periphery of the socket main body, and a first wiring jack and a second wiring jack are formed in the middle of the socket main body; a first wiring terminal is arranged in the first wiring jack and connected with one end of a temperature sensor connecting wire; and a second binding post is arranged in the second wiring jack and is connected with one end of the cable connecting wire.

Compared with the prior art, the utility model, following profitable technological effect has:

(I) the utility model discloses a geothermal well head signal adapter, socket wherein, temperature sensor conducting ring, cable conducting ring, temperature sensor connecting wire and cable connecting wire have constituted signal transmission structure, and this signal transmission structure can be with the temperature signal transmission to the ground signal processor that the temperature sensor of temperature measurement nipple joint measured, because temperature sensor connecting wire and cable connecting wire bury underground at thermal-insulated bush, consequently be difficult for receiving the temperature influence and damage, realized that temperature signal's stable transmission is measured.

(II) the utility model discloses a geothermal well head signal adapter adopts the socket to realize being connected with ground signal processor, has simplified the interconnecting link of complicacy originally, has improved installation effectiveness, success rate and security.

Drawings

Fig. 1 is an overall structure schematic diagram of a wellhead signal adapter of a geothermal well.

Fig. 2 is a schematic structural view of the outer tube.

FIG. 3 is a schematic view of a thermal sleeve construction.

Fig. 4 is a schematic structural view of the flange.

Fig. 5 is a front view of the socket.

Fig. 6 is a side view of the receptacle.

The meaning of the individual reference symbols in the figures is: 1-an outer pipe, 2-a heat insulation bush, 3-a core pipe, 4-a flange plate, 5-a heat transfer medium conveying channel, 6-a socket, 7-a temperature sensor conducting ring, 8-a cable conducting ring, 9-a first wiring hole, 10-a second wiring hole, 11-a temperature sensor connecting wire, 12-a cable connecting wire, 13-an outer heat insulation layer and 14-a sealing ring;

101-a first cavity, 102-a second cavity, 103-a third cavity, 104-a first step, 105-a second step, 106-a heat insulation layer setting section, 107-an outer pipe main body section, 108-a heat insulation pipe connecting section, 109-an outer pipe first shaft shoulder, 110-an outer pipe second shaft shoulder and 111-a heat insulation pipe connecting thread;

201-a first section of the insulating bush, 202-a second section of the insulating bush, 203-a third section of the insulating bush, 204-a first shoulder of the insulating bush, 205-a second shoulder of the insulating bush;

401-flange body, 402-flange central through hole, 403-bolt hole.

601-socket body, 602-socket mounting hole, 603-first wiring jack, 604-second wiring jack, 605-first terminal post, 606-second terminal post.

The technical solution of the present invention is further explained by the following embodiments.

Detailed Description

It should be noted that all the components used in the present invention are known in the art without specific description.

The utility model discloses in:

the cable is a cable with a cable type composite heat insulation pipe known in the prior art, and when the cable type composite heat insulation pipe is actually used, a plurality of sections of cable type composite heat insulation pipes are usually connected in series to form a heat insulation pipe string.

The temperature sensor is a temperature sensor of a temperature measuring nipple of a geothermal well known in the prior art.

Obey above-mentioned technical scheme, following the present utility model discloses a specific embodiment, it needs to explain that the utility model discloses do not confine following specific embodiment to, all fall into the protection scope of the utility model to the equivalent transform of doing on the basis of this application technical scheme.

Example (b):

the embodiment provides a geothermal well mouth signal adapter, as shown in fig. 1 and fig. 2, the geothermal well mouth signal adapter comprises an outer tube 1, and both axial ends of the outer tube 1 are open, and is characterized in that a space in the outer tube 1 sequentially comprises a first cavity 101, a second cavity 102 and a third cavity 103 from left to right, a first step 104 and a second step 105 are arranged on the inner wall of the outer tube 1 from left to right, the first step 104 is located at the junction of the first cavity 101 and the second cavity 102, and the second step 105 is located at the junction of the second cavity 102 and the third cavity 103;

a heat insulation lining 2 is arranged in the third cavity 103, and a core pipe 3 is coaxially arranged in the heat insulation lining 2; one end of the core tube 3 penetrates through the first cavity 101 and the second cavity 102 and extends out of one end of the outer tube 1, one end of the core tube 3, which extends out of the outer tube 1, is fixedly connected with a flange plate 4, and the other end of the core tube 3 penetrates through the heat insulation lining 2 and extends out of the other end of the outer tube 1; both axial ends of the core tube 3 are open, and the space in the core tube 3 is a heat transfer medium conveying channel 5;

a socket 6 is arranged on the outer pipe 1, one axial end of the heat insulation bush 2 is close to the socket 6, and a temperature sensor conducting ring 7 and a cable conducting ring 8 are arranged outside the other axial end of the heat insulation bush 2; a first wiring hole 9 and a second wiring hole 10 are axially formed in the heat insulation lining 2, a temperature sensor connecting wire 11 is arranged in the first wiring hole 9, and a cable connecting wire 12 is arranged in the second wiring hole 10;

one end of a temperature sensor connecting wire 11 and one end of a cable connecting wire 12 are both connected with the socket 6, the other end of the temperature sensor connecting wire 11 penetrates through the first wire routing hole 9 and is connected with the temperature sensor conducting ring 7, and the other end of the cable connecting wire 12 penetrates through the second wire routing hole 10 and is connected with the cable conducting ring 8.

In this embodiment, the heat insulating bush 2 is wound and fixedly bonded on the outer surface of the core tube 3, and the core tube 3 and the flange plate 4, and the core tube 3 and the outer tube 1 are fixedly connected by welding.

In this embodiment, as shown in fig. 2 and 3, the heat insulation bushing 2 is sequentially divided into three sections from left to right, a first shoulder 204 of the heat insulation bushing is located at a junction of the first section 201 and the second section 202 of the heat insulation bushing, and a second shoulder 205 of the heat insulation bushing is located at a junction of the second section 202 and the third section 203 of the heat insulation bushing; the end face of the transverse end of the heat insulation bush 2 abuts against the first step 104, and the second shoulder 205 of the heat insulation bush abuts against the second step 105. The temperature sensor conductive ring 7 and the cable conductive ring 8 are mounted outside the third section 203 of the insulating sleeve.

As a specific scheme of this embodiment, as shown in fig. 2, the outer tube 1 sequentially includes, from left to right, an insulation layer setting section 106, an outer tube main body section 107, and an insulation tube connecting section 108, an outer tube first shoulder 109 is disposed at an end face of one end of the outer tube main body section 107, and an outer tube second shoulder 110 is disposed at an end face of the other end of the outer tube main body section 107; the socket 6 is mounted at the outer tube body section 107.

As a specific solution of this embodiment, as shown in fig. 1 and fig. 2, an outer insulating layer 13 is disposed outside the insulating layer installation section 106, one end of the outer insulating layer 13 extends beyond one end of the outer tube and covers the outside of the core tube 3, and the other end of the outer insulating layer 13 is close to the first shoulder 109 of the outer tube.

In this embodiment, outer heat preservation 13 can reduce geothermal well head signal adapter's calorific loss.

As a specific solution of this embodiment, as shown in fig. 2, a thermal insulation pipe connecting thread 111 is provided on an outer surface of the thermal insulation pipe connecting section 108.

In this embodiment, the external thread 105 is used to connect the outer pipe of the thermal insulation pipe, and the gap between the other end of the thermal insulation bushing 2 and the core pipe 3 is the thermal insulation pipe insertion position 17. The inner pipe of the heat preservation pipe can be inserted into the heat preservation pipe inserting position 17, and the heat preservation pipe inserting position 17 is matched with the heat preservation pipe connecting thread 111, so that the inserting connection of the geothermal well mouth signal adapter and the heat preservation pipe is achieved.

As a specific configuration of the present embodiment, as shown in fig. 1, a plurality of seal rings 14 are provided outside the other end of the core tube 3. The sealing ring 14 is a high-temperature-resistant sealing ring known in the prior art, and the sealing ring 14 can prevent a signal transmission short circuit caused by a heat transfer medium entering a gap between the core pipe 3 and the heat preservation pipe, so that a temperature measurement result is more stable and reliable.

As a specific configuration of this embodiment, as shown in fig. 4, the flange 4 includes a flange main body 401 fixedly connected to the core tube 3, a flange center through hole 402 is formed in the middle of the flange main body 401, and a plurality of bolt holes 403 are formed in the flange 4 around the flange center through hole 402. In this embodiment, the fixed connection of geothermal well wellhead signal adapter and a pipe network is realized through bolt hole 403 and the bolt in bolt hole 403.

As a specific solution of this embodiment, as shown in fig. 5 and fig. 6, the socket 6 includes a socket main body 601 mounted on the outer tube 1, a plurality of socket mounting holes 602 are formed around the socket main body 601, and a first connection jack 603 and a second connection jack 604 are formed in the middle of the socket main body 601; a first binding post 605 is arranged in the first wiring jack 603, and the first binding post 605 is connected with one end of the temperature sensor connecting wire 11; a second terminal 606 is installed in the second terminal socket 604, and the second terminal 606 is connected to one end of the cable connection line 12.

In this embodiment, the socket 6 is used to connect a plug of a ground signal processor, and transmit a digital signal to the ground signal processor through a temperature measurement bus, so as to realize transmission measurement of a temperature signal. The ground signal processor employs a computer known in the art.

In this embodiment, the outer tube 1, the core tube 3, and the flange plate 4 are made of steel. The steel material is specifically the steel material that accords with American petroleum institute standard, adopts steel material can improve geothermal well head signal adapter's intensity, life-span and temperature resistant withstand voltage ability.

In this embodiment, the material of the heat insulation lining 2 and the outer heat insulation layer 13 is alicyclic epoxy glass fiber reinforced plastic or polyimide glass fiber reinforced plastic. Alicyclic epoxy glass steel and polyimide glass steel have the quality light, mechanical strength is high, electrical insulation is good and look characteristics such as coefficient of thermal conductivity low, can satisfy geothermal well head signal adapter's electrically conductive demand, improve geothermal well head signal adapter's intensity. In addition, the alicyclic epoxy glass fiber reinforced plastic and the polyimide glass fiber reinforced plastic can also bear the temperature of more than 150 ℃ for a long time, so that the temperature resistance of the wellhead signal adapter of the geothermal well can be improved.

The utility model discloses an installation and working process as follows:

firstly, connect gradually geothermal well temperature measurement nipple joint, insulating tube cluster and geothermal well head signal adapter to transfer and install in the geothermal well, then through ring flange 4 with geothermal well head signal adapter and a pipe network fixed connection.

Secondly, after the geothermal well temperature measurement short section reaches the preset temperature measurement position of the geothermal well, a heat transfer medium is introduced, flows to the bottom of the well through the annular space between the heat preservation pipe string and the buried pipe outer pipe and completes heat exchange with the stratum, and then sequentially flows through the geothermal well temperature measurement short section, the heat preservation pipe string, the geothermal well mouth signal adapter, the flange plate central through hole 402 and the primary pipe network, so that heat extraction of the heat exchange type geothermal well is realized.

And thirdly, in the heat exchange process, the temperature sensor of the temperature measuring nipple of the geothermal well measures the temperature of the geothermal field and the temperature in the central channel of the heat preservation pipe string in real time, and the measured temperature signal is transmitted to the ground signal processor through the heat preservation pipe string, the temperature sensor conducting ring 7, the temperature sensor connecting wire 11 and the socket 6.

Fourthly, in the heat exchange process, electric power is transmitted to the heat preservation pipe string through the socket 6, the cable connecting wire 12 and the cable conducting ring 8, and electric power supply is achieved.

Claims

1. The wellhead signal adapter for the geothermal well comprises an outer pipe (1), wherein both axial ends of the outer pipe (1) are open, and the wellhead signal adapter is characterized in that a first cavity (101), a second cavity (102) and a third cavity (103) are sequentially arranged in the space in the outer pipe (1) from left to right, a first step (104) and a second step (105) are arranged on the inner wall of the outer pipe (1) from left to right, the first step (104) is located at the junction of the first cavity (101) and the second cavity (102), and the second step (105) is located at the junction of the second cavity (102) and the third cavity (103);

a heat insulation lining (2) is arranged in the third cavity (103), and a core pipe (3) is coaxially arranged in the heat insulation lining (2); one end of the core pipe (3) penetrates through the first cavity (101) and the second cavity (102) and extends out of one end of the outer pipe (1), one end of the core pipe (3) extending out of the outer pipe (1) is fixedly connected with a flange plate (4), and the other end of the core pipe (3) penetrates through the heat insulation lining (2) and extends out of the other end of the outer pipe (1); both axial ends of the core pipe (3) are open, and the space in the core pipe (3) is a heat transfer medium conveying channel (5);

a socket (6) is mounted on the outer pipe (1), one axial end of the heat insulation lining (2) is close to the socket (6), and a temperature sensor conducting ring (7) and a cable conducting ring (8) are arranged outside the other axial end of the heat insulation lining (2); a first wiring hole (9) and a second wiring hole (10) are formed in the heat insulation lining (2) along the axial direction, a temperature sensor connecting wire (11) is arranged in the first wiring hole (9), and a cable connecting wire (12) is arranged in the second wiring hole (10);

one end of the temperature sensor connecting wire (11) and one end of the cable connecting wire (12) are both connected with the socket (6), the other end of the temperature sensor connecting wire (11) penetrates through the first wire routing hole (9) and is connected with the temperature sensor conducting ring (7), and the other end of the cable connecting wire (12) penetrates through the second wire routing hole (10) and is connected with the cable conducting ring (8).

2. The wellhead signal adapter of the geothermal well according to claim 1, wherein the outer pipe (1) is sequentially provided with an insulating layer arrangement section (106), an outer pipe main body section (107) and an insulating pipe connection section (108) from left to right, an outer pipe first shaft shoulder (109) is arranged on the end face of one end of the outer pipe main body section (107), and an outer pipe second shaft shoulder (110) is arranged on the end face of the other end of the outer pipe main body section (107); the socket (6) is arranged at the outer tube main body section (107).

3. The wellhead signal adapter of the geothermal well according to claim 2, wherein an outer insulating layer (13) is arranged outside the insulating layer arrangement section (106), one end of the outer insulating layer (13) extends out of one end of the outer pipe and covers the outside of the core pipe (3), and the other end of the outer insulating layer (13) is close to the first shaft shoulder (109) of the outer pipe.

4. The wellhead signal adapter according to claim 2, wherein the outer surface of the insulating pipe connecting section (108) is provided with an insulating pipe connecting thread (111).

5. A wellhead signal adapter according to claim 1, characterised in that a plurality of sealing rings (14) are provided externally at the other end of the core tube (3).

6. The wellhead signal adapter of the geothermal well according to claim 1, wherein the flange (4) comprises a flange main body (401) fixedly connected with the core pipe (3), a flange central through hole (402) is formed in the middle of the flange main body (401), and a plurality of bolt holes (403) are formed in the flange (4) around the flange central through hole (402).

7. The wellhead signal adapter of the geothermal well according to claim 1, wherein the socket (6) comprises a socket main body (601) installed on the outer pipe (1), a plurality of socket installation holes (602) are formed on the periphery of the socket main body (601), and a first wiring jack (603) and a second wiring jack (604) are formed in the middle of the socket main body (601); a first binding post (605) is arranged in the first wiring jack (603), and the first binding post (605) is connected with one end of the temperature sensor connecting wire (11); a second binding post (606) is arranged in the second wiring jack (604), and the second binding post (606) is connected with one end of the cable connecting wire (12).