CN217354332U

CN217354332U - Heat insulation device in horizontal well electric heater

Info

Publication number: CN217354332U
Application number: CN202123115919.XU
Authority: CN
Inventors: 不公告发明人
Original assignee: Beijing Honglanhei Energy Technology Co ltd
Current assignee: Beijing Honglanhei Energy Technology Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-09-02
Anticipated expiration: 2031-12-13

Abstract

The heat insulation device in the electric heater of the horizontal well is applicable to exploiting oil gas in the oil and gas industry by heating the formation water of the oil and gas reservoir, and comprises: the sieve tube comprises a sieve tube and a heating element, wherein the heating element is fixed in the sieve tube, one part of the sieve tube is provided with an inner heat insulation layer and an outer heat insulation layer, the positions of the inner heat insulation layer and the outer heat insulation layer of the sieve tube correspond to each other, and the part, which is not provided with the heat insulation layer, of the sieve tube comprises a cut or a drilled hole. The iron core can increase the thermal efficiency and enhance the electromagnetic field of the heating coil under the action of electromagnetic induction, and is beneficial to removing scale by an electromagnetic method.

Description

Heat insulation device in horizontal well electric heater

Technical Field

The utility model relates to a heat-proof device among the horizontal well electric heater is particularly useful for exploiting oil gas through heating oil gas reservoir stratum water mode in the oil and gas industry trade.

Background

The oil and gas reservoir contains hydrocarbon reservoir, shale layer, coal seam, and the stratum water of below can be natural stratum water, also can be later stage ground injected water, and it is thin to be applicable to the oil and gas reservoir water layer thickness promptly, and perhaps stratum water does not develop, needs the oil and gas exploitation of the oil and gas reservoir of water injection, also is applicable to through water injection mode heating shale and coal seam, through high temperature pyrolysis mode exploitation oil and gas.

A CN201480001286.3 horizontal well electric heating oil deposit side bottom water layer thermal recovery method discloses a horizontal well electric heater structure chart for heating formation water. However, this structure has two drawbacks: firstly, the lower half pipe of the screen pipe of the horizontal well does not have a heat insulation function, only depends on a vacuum cavity of the lower half pipe, the heat insulation function is limited, and high-temperature heat energy can be transferred downwards along the lower half pipe of the screen pipe; and secondly, the ferrite permanent magnet is expensive in manufacturing cost, and is easy to interact with an electromagnetic field of an electrified coil in an alternating current environment, so that the demagnetization phenomenon is caused, and the magnetic descaling effect is influenced. CN202110330593.8 discloses a new structural design of an immersed horizontal well electric heater for heating formation water, which is characterized in that the structural design strives to reduce the heat loss of the formation water, and the heat energy is collected in the upper oil gas layer, although the heating effect is good, the structural design is complex and the cost is high.

Disclosure of Invention

Combine the two excellent shortcoming of design and oil gas reservoir, shale and the unbalanced characteristic of coal bed stratum water thickness development, compensate the former design not enough, this heating horizontal well utility model designs, simple structure, and is with low costs, can effectively reduce the heat loss of heating horizontal well place plane below stratum water.

Thermal insulation device in horizontal well electric heater includes: the sieve tube comprises a sieve tube and a heating element, wherein the heating element is fixed in the sieve tube, one part of the sieve tube is provided with an inner heat insulation layer and an outer heat insulation layer, the positions of the inner heat insulation layer and the outer heat insulation layer of the sieve tube correspond to each other, and the part of the sieve tube which is not provided with the heat insulation layer comprises a slot or a drill hole.

The heating element in the heat insulation device in the horizontal well electric heater is a resistance coil.

The heat insulation device in the horizontal well electric heater also comprises a heat insulation plate arranged at the horizontal diameter part in the sieve tube, and a heat insulation layer is arranged on the surface of the heat insulation plate.

The heat insulation device in the horizontal well electric heater also comprises a sealing element, and the sealing element is tightly contacted with the inner wall of the sieve tube and the heat insulation plate.

The heat insulation device in the horizontal well electric heater also comprises a support arranged on the heat insulation plate and an iron core arranged in the resistance coil, and the resistance coil is fixed on the support.

The part of the heat insulation layer configured on the sieve tube in the heat insulation device in the horizontal well electric heater is half of the outer perimeter of the sieve tube.

The part of the heat insulation device of the horizontal well electric heater, which is provided with the heat insulation layer, of the sieve pipe is larger than half of the outer perimeter of the sieve pipe.

The slots or the drill holes in the heat insulation device in the horizontal well electric heater and the resistance coils are positioned on the same side of the heat insulation plate.

Drawings

FIG. 1 is a cross-sectional view of a heat insulating device in an electric heater for a horizontal well

FIG. 2 is a schematic longitudinal section of the heat insulating device in the horizontal well electric heater

Wherein the content of the first and second substances,

1. a screen pipe;

2. the screen pipe is externally provided with a heat insulation layer;

3. inner heat insulation layer of sieve tube

4. A heat insulation plate;

5. a thermal insulation layer on the thermal insulation board;

6. a sealing plate;

7. a support;

8. a resistance coil;

9. an iron core;

10. the heat insulation plate, the sealing plate and the half-pipe (not slotted or drilled) under the sieve pipe together enclose a vacuum cavity.

Advantageous effects of development

The iron core of the heat insulation device in the horizontal well electric heater can increase the thermal efficiency and enhance the electromagnetic field of the heating coil under the action of electromagnetic induction, and is beneficial to removing water scales by an electromagnetic method. The heat insulation device consisting of the resistance coil support, the heat insulation layer, the heat insulation plate and the sealed vacuum cavity is beneficial to reducing heat loss transferred downwards by the horizontal well electric heater.

The heat insulation device in the horizontal well electric heater can heat the stratum with high power, the problem of curie temperature demagnetization is avoided, and a permanent magnet formed under direct current can be recycled; continuously heating at high temperature, wherein the bottom temperature of the oil layer can meet the pyrolysis requirement of hydrocarbons, and the pyrolysis reaction of the hydrocarbon source rock and the crude oil of the high-molecular stratum is facilitated; the bottom water can be vaporized at high temperature to form bottom water vapor drive, which provides power for oil gas production.

Detailed Description

As shown in the attached drawings 1 and 2:

1) the inner wall of the lower half pipe of the horizontal well screen pipe (1) is provided with a heat insulation layer (3), and the outer wall is provided with an abrasion-resistant heat insulation layer (2);

2) a reflective metal heat insulation layer (5) is fixed on the upper surface of the heat insulation plate (4);

3) the heat insulation plate is provided with a fixing bracket (7) which plays a role of supporting and fixing the iron core (9) and the resistance coil (8) and has a downward heat insulation function;

4) the heat insulation plate is fixed at the horizontal diameter of the sieve tube;

5) the sealing plate (6) is sealed with the lower half pipe of the sieve tube and the heat insulation plate to form a vacuum cavity (10) for downward heat insulation, and the sealing plate simultaneously bears the weight and ensures the sieve tube to be positive, namely a slot or a drilling area acts above;

6) the iron core is placed in the middle of the resistance coil and fixed on the resistance coil bracket together with the resistance coil, and the resistance coil is subjected to electromagnetic induction after being electrified, so that the heat effect is increased, the electromagnetic field is strengthened, and the scale is removed;

7) the selection of the iron core material depends on whether the electrified coil is electrified with direct current or alternating current: when the power supply is direct current, the iron core in the middle of the heating resistor is a sinter of magnetic anisotropy based on alnico, hard iron, samarium-cobalt magnetic steel and Fe-B-R (Nd); when the power supply is alternating current, the iron core in the middle of the heating resistor is soft iron;

8) the configured horizontal well electric heater is placed in a horizontal well horizontal section of open hole well completion in an oil-gas reservoir water layer and is connected with a ground power supply and a control switch through cables.

Claims

1. The heat insulation device in the electric heater of the horizontal well is characterized by comprising: the sieve tube comprises a sieve tube (1) and a heating element, wherein the heating element is arranged in the sieve tube, one part of the sieve tube is provided with an inner heat insulation layer (3) and an outer heat insulation layer (2), the positions of the inner heat insulation layer and the outer heat insulation layer of the sieve tube correspond to each other, and the part of the sieve tube, which is not provided with the heat insulation layer, is provided with a slot or a drill hole; the sieve tube also comprises a heat insulation plate (4), the heat insulation plate is arranged at the diameter position of the sieve tube, and a heat insulation layer (5) is arranged on the surface of the heat insulation plate; the screen pipe also comprises a sealing element (6), and the sealing element is tightly contacted with the inner wall of the screen pipe and the heat insulation plate.

2. The thermal insulation device in an electric heater of a horizontal well according to claim 1, characterized in that the heating element is a resistance coil (8).

3. The heat insulation device in the electric heater of the horizontal well according to claim 2, further comprising a bracket (7) fixed on the heat insulation plate and an iron core (9) disposed in the resistance coil, the resistance coil being fixed on the bracket.

4. The thermal insulation device in the horizontal well electric heater according to claim 1, wherein the screen pipe is provided with the thermal insulation layer in a portion which is half of the outer circumference of the screen pipe.

5. The thermal insulation apparatus in an electric heater of a horizontal well according to claim 1, wherein the screen is provided with a thermal insulation layer having a portion larger than a half of the outer circumference of the screen.

6. The thermal insulation apparatus in an electric heater for horizontal wells according to claim 2 wherein said slit or bore is on the same side of said thermal insulation plate as said resistance coil.