CN117381192A - Laser remote fire cutting system for oil-gas well and use method - Google Patents
Laser remote fire cutting system for oil-gas well and use method Download PDFInfo
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- CN117381192A CN117381192A CN202311544586.3A CN202311544586A CN117381192A CN 117381192 A CN117381192 A CN 117381192A CN 202311544586 A CN202311544586 A CN 202311544586A CN 117381192 A CN117381192 A CN 117381192A
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- 238000003698 laser cutting Methods 0.000 claims abstract description 52
- 230000001681 protective effect Effects 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims description 27
- 239000000110 cooling liquid Substances 0.000 claims description 24
- 230000005540 biological transmission Effects 0.000 claims description 21
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- 238000012360 testing method Methods 0.000 description 2
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- Optics & Photonics (AREA)
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- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a laser remote fire cutting system for an oil-gas well and a use method thereof, belonging to the technical field of oil-gas well emergency, wherein the system comprises a first moving platform far away from a wellhead and a second moving platform close to the wellhead, a laser for outputting laser is arranged on the first moving platform, a protective shell is arranged on the second moving platform, a laser cutting head is arranged on the protective shell, and the laser is transmitted to the laser cutting head and is output to the wellhead to realize fire cutting.
Description
Technical Field
The invention belongs to the technical field of oil and gas well rescue, and particularly relates to a laser remote fire cutting system for an oil and gas well and a use method thereof.
Background
In the development process of oil and gas fields, well blowout out-of-control accidents can occur in the drilling, oil testing, gas testing and oil production gas processes, after the well blowout is out-of-control and catches fire, equipment, instruments and material equipment around a well head are burnt out and deformed by large fire due to the fact that oil gas pressure in the well is high, the yield is large, and a derrick, a drilling machine, a drilling tool, a wellhead device, a diesel engine, a drilling pump, solid control equipment and the like are burnt out and stacked in a well site. In order to effectively control out-of-control fires in a blowout, barrier removal cutting must be performed to remove the burned old wellhead and reinstall the new wellhead.
Due to conditions such as high temperature, water spraying, smog and open-air topography of a fire scene, visual conditions of operations such as on-site obstacle clearing and cutting are bad, observation accuracy is insufficient, errors are easy to occur during cutting, and rescue cutting work is slow in progress and low in efficiency. Meanwhile, people near the wellhead observe and command cutting have larger limitations, even if strict protective measures are adopted to carry out close-range rescue operation, a lot of unsafe hidden dangers are brought, the risk of injury to the people is large, and the safety of rescue personnel cannot be guaranteed.
Disclosure of Invention
In order to solve the problems, a laser remote fire cutting system for an oil-gas well and a use method thereof are provided.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, the present invention provides a laser remote fire cut system for an oil and gas well, comprising:
the first moving platform is far away from the wellhead, and is provided with a laser for outputting laser;
and a second mobile platform close to the wellhead, wherein a protective shell is arranged on the second mobile platform, a laser cutting head is arranged on the protective shell, and laser is transmitted to the laser cutting head and output to the wellhead to realize fire cutting.
The technical scheme is further that the laser comprises a pulse laser and a continuous laser, and the pulse laser output by the pulse laser and the continuous laser output by the continuous laser are combined to form composite laser.
The technical scheme is further characterized in that a plurality of continuous lasers are arranged, and the continuous lasers output continuous lasers with the same wavelength.
The technical scheme is further characterized in that a flexible pipeline is connected between the first moving platform and the second moving platform, and a laser transmission optical fiber, a gas circuit, a cooling liquid circuit and an electric connection circuit are arranged in the flexible pipeline.
The technical scheme is further characterized in that an air source and a cooling liquid tank are further arranged on the first moving platform, the air line is respectively communicated with the air source and the laser cutting head, the cooling liquid line is respectively communicated with the cooling liquid tank and the protective shell, and the laser transmission optical fiber is respectively connected with the laser and the laser cutting head.
The technical scheme is further characterized in that one end of the laser cutting head extends to the inside of the protective shell and serves as an input end, an illumination light source is arranged at the input end, and a high-pressure air pipe communicated with the air line is arranged at the position, close to the input end, of the laser cutting head.
The technical scheme is further characterized in that an optical path transmission element and an optical monitoring element are arranged in the protective shell, laser output by the laser transmission optical fiber is transmitted to the laser cutting head through the optical path transmission element, and the optical monitoring element is arranged corresponding to the input end.
The technical scheme is that the optical path transmission element comprises a collimation output head, a first reflecting mirror and a second reflecting mirror, the collimation output head is connected with a laser transmission optical fiber, the second reflecting mirror is obliquely arranged, the optical axis of the second reflecting mirror coincides with the central axis of the laser cutting head, and the first reflecting mirror is arranged in parallel with the second reflecting mirror.
The technical scheme is further characterized in that the optical monitoring element is located at one side, far away from the laser cutting head, of the second reflecting mirror, and a narrow-band filter with center wavelength matched with the wavelength of illumination light is arranged between the optical monitoring element and the second reflecting mirror.
The technical scheme is further characterized in that a cooling channel communicated with a cooling liquid line is arranged inside the protective shell, a spray pipe communicated with the cooling channel is arranged on the protective shell, and spray holes for spraying cooling liquid towards the outer surface of the protective shell are formed in the spray pipe.
The technical scheme is further that the wellhead is paved with guide rails, and the second movable platform is a crawler-type platform.
The technical scheme is further characterized in that the outer surfaces of the flexible pipeline, the laser cutting head and the protective shell are sequentially provided with a heat insulation layer and a high-temperature impact resistant layer from inside to outside.
In a second aspect, the invention provides a method of using a laser remote fire cutting system for an oil and gas well, comprising the steps of:
before cutting, the first moving platform moves to a position far away from a wellhead, and the second moving platform conveys the laser cutting head to a position close to the wellhead;
when cutting, the laser cutting head outputs compound laser to the outer surface of the wellhead, the second moving platform moves around the wellhead to perform primary cutting and form a first cutting seam, the depth of the first cutting seam is smaller than the wall thickness of the wellhead, the laser cutting head outputs continuous laser to the outer surface of the wellhead, the second moving platform moves around the wellhead to perform secondary cutting and form a second cutting seam on the basis of the first cutting seam, the sum of the depths of the first cutting seam and the second cutting seam is equal to the wall thickness of the wellhead, the first cutting seam is a closed annular cutting seam, the second cutting seam is a non-closed annular cutting seam, and the wellhead is inclined towards the direction without forming the second cutting seam under the action of fluid pressure in the well.
The technical scheme is further characterized in that the composite laser and the continuous laser are rectangular light spots, the long sides of the rectangular light spots are parallel to the axial direction of the wellhead, and the wide sides of the rectangular light spots are parallel to the radial direction of the wellhead.
The technical scheme is further characterized in that in the first cutting seam forming process, the compound laser is circularly scanned for a plurality of times along the circumferential direction of the wellhead, the longitudinal section of the first cutting seam is isosceles trapezoid, and the depth of the first cutting seam is smaller than the wall thickness of the wellhead by 20mm-30mm.
The technical scheme is further that in the second cutting seam forming process, the continuous laser scans along the circumferential direction of the wellhead in a single way, and the included angle between the continuous laser and the first cutting seam is 40-50 degrees.
The technical scheme is further that the circumference of the second cutting seam which is not formed is 1/3 of the circumference of the wellhead along the circumference of the wellhead.
The beneficial effects of the invention are as follows:
1. the second moving platform conveys the laser cutting head to the position close to the wellhead, the first moving platform bears the laser to be away from the wellhead, laser remote fire cutting is achieved, personnel are not required to operate near the wellhead, and safety is improved.
2. The laser cutting head has a visual function, effectively solves the influence of severe conditions of a cutting action area on cutting light beams and illumination light, can provide clear optical images, realizes visualization, and effectively improves the cutting obstacle clearance operation efficiency.
3. The protective shell adopts double cooling and has good temperature resistance, so as to adapt to the high-temperature fire environment and realize the emergency operation near the wellhead.
4. The wellhead is cut into thin by adopting the composite laser, the cutting amount is accurately controlled on the basis of visualization, and the wellhead is cut by adopting the continuous laser, so that the wellhead is cut with high efficiency.
5. The second movable platform deviates from the angle to bypass the wellhead, so that continuous laser is promoted to incline to cut the wellhead, and the influence of high-pressure jet airflow of a notch on cutting is prevented.
Drawings
FIG. 1 is a schematic diagram of a laser remote fire cutting system for an oil and gas well in accordance with the present invention;
FIG. 2 is a cross-sectional view of the protective housing of the present invention;
FIG. 3 is a schematic diagram of an optical path transmission element according to the present invention;
FIG. 4 is a schematic illustration of a wellhead cutting variation in accordance with the present invention;
FIG. 5 is a schematic illustration of a composite laser cut wellhead in accordance with the present invention;
FIG. 6 is a schematic diagram of a continuous laser cutting wellhead in accordance with the present invention;
fig. 7 is a schematic view of a first slit and a second slit in the present invention.
In the accompanying drawings: 1-first moving platform, 2-second moving platform, 3-protective shell, 4-laser cutting head, 5-wellhead, 6-flexible pipeline, 7-shower, 8-pulse laser, 9-continuous laser, 10-air source, 11-cooling liquid tank, 12-cooling channel, 13-ceramic fiber layer, 14-mullite layer, 15-zirconia ceramic layer, 16-yttrium oxide ceramic layer, 17-collimation output head, 18-focusing lens, 19-first reflecting mirror, 20-second reflecting mirror, 21-narrow band filter, 22-optical monitoring element, 23-illumination light source, 24-guide rail, 25-first cutting slit, 26-second cutting slit.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without making creative efforts should fall within the scope of protection of the present application. In addition, directional words such as "upper", "lower", "left", "right", and the like, as used in the following embodiments are merely directions with reference to the drawings, and thus, the directional words used are intended to illustrate, not to limit, the invention.
Embodiment one:
as shown in fig. 1 to 3, a laser remote fire cutting system for an oil and gas well comprises a first mobile platform 1 and a second mobile platform 2, wherein the first mobile platform 1 adopts a wheel type driving chassis, and the driving chassis is arranged far away from a wellhead 5, such as a distance of 200m from the wellhead 5. The second movable platform 2 adopts a crawler-type driving chassis, and is arranged close to the wellhead 5. Such as 2m from the wellhead 5.
The first moving platform 1 is provided with a laser for outputting laser, an air source 10 and a cooling liquid tank 11, specifically, the laser comprises a pulse laser 8 and a continuous laser 9, and the pulse laser output by the pulse laser 8 and the continuous laser output by the continuous laser 9 are combined to form composite laser.
Preferably, the continuous laser 9 may be provided with a plurality of continuous lasers 9, and the plurality of continuous lasers 9 output continuous lasers with the same wavelength, and the plurality of continuous lasers are combined with the pulse laser for the second time after being combined for the first time.
Specifically, the second mobile platform 2 is provided with a protective shell 3, the protective shell 3 is provided with a laser cutting head 4, and laser is transmitted to the laser cutting head 4 and output to a wellhead 5, so that laser remote fire cutting is realized.
Correspondingly, a flexible pipeline 6 is connected between the first mobile platform 1 and the second mobile platform 2, and a laser transmission optical fiber, a gas circuit, a cooling liquid circuit and an electric connection circuit are arranged in the flexible pipeline 6. Preferably, the flexible pipe 6 is a bellows. It should be noted that the gas lines are respectively connected to the gas source 10 and the laser cutting head 4, and are used for delivering high-pressure gas flow to the laser cutting head 4. The cooling liquid line is respectively communicated with the cooling liquid tank 11 and the protective shell 3 and is used for conveying cooling liquid to the protective shell 3. The laser transmission optical fiber is respectively connected with the laser and the laser cutting head 4, and the laser is far away from the wellhead 5, so that laser remote transmission is realized.
Specifically, the inside of laser cutting head 4 leaves the cavity, simultaneously, the one end of laser cutting head 4 extends to the inside of protective housing 3 and as the input, the position that laser cutting head 4 is close to its input is equipped with the high-pressure gas pipe with gas line intercommunication, and the high-pressure gas flows through the high-pressure gas pipe and carries in the cavity of laser cutting head 4.
Meanwhile, the input end is provided with an illumination light source 23 and an optical window 5, and the surface of the optical window 5 is plated with a high-transmittance film of laser and illumination light, so that illumination light and laser output are realized. Preferably, a plurality of illumination light sources 23 are arranged along the circumferential direction of the laser cutting head 4.
Specifically, the protection casing 3 is internally provided with an optical path transmission element and an optical monitoring element 22, the laser output by the laser transmission fiber is transmitted to the laser cutting head 4 by the optical path transmission element, and the optical monitoring element 22 is arranged corresponding to the input end.
It should be noted that the optical path transmission element includes a collimating output head 17, a focusing lens 18, a first reflecting mirror 19 and a second reflecting mirror 20, where the collimating output head 17 is connected with a laser transmission optical fiber to collimate laser, the collimated beam is sequentially transmitted to the first reflecting mirror 19, the second reflecting mirror 20 and the laser cutting head 4 through the focusing lens 18, the second reflecting mirror 20 is obliquely arranged, and an optical axis of the second reflecting mirror 20 coincides with a central axis of the laser cutting head 4, and the first reflecting mirror 19 is parallel to the second reflecting mirror 20.
In particular, the optical monitoring element 22 is located on the side of the second mirror 20 remote from the laser cutting head 4, and the optical monitoring element 10 is preferably an infrared camera, an industrial camera or a three-dimensional profile laser scanner. A narrowband filter 21 with a center wavelength matching the wavelength of the illumination light is disposed between the optical monitoring element 22 and the second reflecting mirror 20, and only the illumination light can transmit, and the laser light and other wave band light (combustion flame, infrared radiation) cannot transmit. Meanwhile, the surface of the second reflecting mirror 20 is coated with a high-transmission film of laser light and a high-transmission film of illumination light.
When the laser cutting device is used, illumination light is output to a cutting area through the laser cutting head 4 and reflected back to the optical monitoring element 22 so as to construct an environmental image of the cutting area, meanwhile, under the action of high-pressure air flow, the influence of severe conditions of a cutting action area on laser and the illumination light is effectively solved, clear optical images can be provided, visualization is realized, the problems of blind cutting and repeated cutting are solved, the cutting obstacle clearance operation efficiency is effectively improved, residual slag in the laser cutting area can be removed, and meanwhile, laser, illumination light and high-pressure air flow are emitted by the laser cutting head 4, so that the integration level is high and the occupied space is small.
Specifically, the inside of the protective housing 3 is provided with a cooling channel 12 communicated with a cooling liquid line, and correspondingly, the protective housing 3 is provided with a liquid inlet and a liquid outlet, and the liquid inlet, the liquid outlet and the cooling channel 12 are communicated. It should be noted that, the cooling liquid is injected into the cooling channel 12 from the liquid inlet, and flows through the cooling channel 12 to the liquid outlet for output, so as to realize the first re-cooling protection of the protective shell 3. The protective shell 3 is provided with a spray pipe 7 communicated with the cooling channel 12, and the spray pipe 7 is provided with spray holes for spraying cooling liquid towards the outer surface of the protective shell 3. It should be noted that, the cooling liquid in the cooling channel 12 may circulate to the spray pipe 7 and be sprayed to the outer surface of the protective housing 3 through the spray holes, so as to cool and dissipate heat on the outer surface of the protective housing 3, and realize the second cooling protection of the protective housing 3. Meanwhile, the cooling liquid in the spray pipe 7 is sourced from a cooling channel, so that the effective utilization rate of the cooling liquid is realized.
Preferably, the spray pipe 7 is a high temperature resistant ceramic spray pipe, one end of the spray pipe far away from the protective housing 3 is provided with a closed structure, and the spray holes are uniformly distributed on the pipe wall of the spray pipe 7. Meanwhile, the spraying pipes 7 can be uniformly distributed on the top and/or the side wall of the protective shell 3.
In order to adapt to the high-temperature environment, the outer surfaces of the flexible pipeline 6, the laser cutting head 4 and the protective shell 3 are sequentially provided with a heat insulation layer and a high-temperature impact resistant layer from inside to outside so as to have a heat protection function. Specifically, the heat insulation layer sequentially comprises a mullite layer 14 and a ceramic fiber layer 13 from top to bottom, and the ceramic fiber layer 13 has a layered pore structure, has low heat conductivity, can insulate heat and can buffer. The mullite layer 14 is used as a flame-retardant heat-insulating material, can resist high temperature, can be manufactured in large size and has low cost. The high-temperature impact resistant layer sequentially comprises a yttrium oxide ceramic layer 16 and a zirconium oxide ceramic layer 15 from top to bottom, wherein the yttrium oxide ceramic layer 16 plays a role in resisting thermal shock and homogenizing a temperature field, and the zirconium oxide ceramic layer 15 plays a role in resisting high temperature and insulating heat. The yttria ceramic layer 16 is formed by splicing a plurality of yttria ceramic blocks, and the zirconia ceramic layer 15 is formed by splicing a plurality of zirconia ceramic blocks.
Embodiment two:
as shown in fig. 1 to 7, a method for using a laser remote fire cutting system for an oil and gas well includes the steps of:
before cutting, a guide rail 24 is laid near the wellhead 5, the first moving platform 1 moves to a position far away from the wellhead 5, and the second moving platform 2 conveys the laser cutting head 4 to a position close to the wellhead 5.
When cutting, first, the laser cutting head 4 outputs compound laser to the outer surface of the wellhead 5, the second moving platform 2 moves back and forth around the wellhead, so that the compound laser is circularly scanned for a plurality of times along the circumferential direction of the wellhead, one-time cutting is performed, a first cutting slit 25 is formed, the depth of the first cutting slit 25 is smaller than the wall thickness of the wellhead 5, and the wellhead is cut thinly.
Preferably, the depth of the first cutting slit 25 is smaller than 20mm-30mm of the wall thickness of the wellhead, and the longitudinal section of the first cutting slit 25 is isosceles trapezoid, so that high-pressure air flow is facilitated, and cutting efficiency is improved.
Then, the laser cutting head 4 outputs continuous laser to the outer surface of the wellhead 5, the second moving platform 2 moves around the wellhead 5 in a single pass, the continuous laser is driven to scan along the circumferential direction of the wellhead 5 in a single pass, the included angle between the continuous laser and the first cutting slit is 40-50 degrees, the second cutting is carried out on the basis of the first cutting slit 25, a second cutting slit 26 is formed, the sum of the depths of the first cutting slit 25 and the second cutting slit 26 is equal to the wall thickness of the wellhead 5, and the wellhead 5 is beveled. The first slit 25 is a closed annular slit, the second slit 26 is an unsealed annular slit, and the wellhead 5 is tilted in a direction in which the second slit 26 is not formed under the pressure of the fluid in the well. Preferably, along the circumference of the wellhead 5, the circumference (i.e., the cut reserve circumference) where the second cut 26 is not formed is 1/3 of the circumference of the wellhead 5.
It is worth to say that continuous laser has the features of low power density, great heat conducting loss, long energy injection and accumulation and low efficiency. The high energy density of the pulse laser generates high-temperature high-pressure steam and plasma, the hydrodynamic motion of the pulse laser forms a mechanical effect, and the ablation product is quickly ejected and dispersed, so that the removal area is small. When the composite laser is adopted, the continuous laser heating leads the temperature of the side wall of the wellhead to rise, the Young modulus and the yield strength of the side wall to be reduced, the damage strength to be reduced, the pulse laser with high power density forms high-temperature and high-pressure steam and plasma, and huge mechanical effect is generated to separate part of the unmelted material, thereby leading the stripping temperature to be less than the melting point. The composite laser energy causes larger and deeper ablation holes, and if the same ablation effect is obtained, the corresponding required laser power is greatly reduced.
Specifically, the composite laser and the continuous laser are rectangular light spots, the long sides of the rectangular light spots are parallel to the axial direction of the wellhead 5, the beam divergence angle is large, no light is blocked, high power density can be obtained, the wide sides of the rectangular light spots are parallel to the radial direction of the wellhead 5, the beam divergence angle is small, and the cutting depth is suitable to be increased.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, but is not intended to limit the scope of the invention, i.e., the invention is not limited to the details shown and described.
Claims (10)
1. A laser remote fire cutting system for an oil and gas well, comprising:
the first moving platform is far away from the wellhead, and is provided with a laser for outputting laser;
and a second mobile platform close to the wellhead, wherein a protective shell is arranged on the second mobile platform, a laser cutting head is arranged on the protective shell, and laser is transmitted to the laser cutting head and output to the wellhead to realize fire cutting.
2. The laser remote fire cutting system for oil and gas wells according to claim 1, wherein the laser comprises a pulse laser and a continuous laser, and the pulse laser output by the pulse laser and the continuous laser output by the continuous laser are combined to form a composite laser.
3. The laser remote fire cutting system for oil and gas wells according to claim 1, wherein a flexible pipeline is connected between the first moving platform and the second moving platform, and a laser transmission optical fiber, a gas line, a cooling liquid line and an electric connection line are arranged in the flexible pipeline.
4. The laser remote fire cutting system for an oil-gas well according to claim 3, wherein the first moving platform is further provided with an air source and a cooling liquid tank, the air line is respectively communicated with the air source and the laser cutting head, the cooling liquid line is respectively communicated with the cooling liquid tank and the protective shell, and the laser transmission optical fiber is respectively connected with the laser and the laser cutting head.
5. A laser remote fire cutting system for oil and gas wells according to claim 3 or 4, wherein one end of the laser cutting head extends into the interior of the protective housing and serves as an input end, the input end is provided with an illumination light source, and a high-pressure gas pipe communicated with a gas line is arranged at a position of the laser cutting head close to the input end.
6. The system of claim 5, wherein the protective housing is internally provided with an optical path transmission element and an optical monitoring element, the laser output by the laser transmission fiber is transmitted to the laser cutting head by the optical path transmission element, and the optical monitoring element is arranged corresponding to the input end.
7. A laser remote fire cutting system for oil and gas wells according to claim 3, wherein a cooling channel communicated with a cooling liquid line is arranged in the protective shell, a spray pipe communicated with the cooling channel is arranged on the protective shell, and a spray hole for spraying cooling liquid towards the outer surface of the protective shell is formed in the spray pipe.
8. The laser remote fire cutting system for oil and gas wells according to claim 3, wherein the outer surfaces of the flexible pipeline, the laser cutting head and the protective shell are sequentially provided with a heat insulation layer and a high-temperature impact resistant layer from inside to outside.
9. The application method of the laser remote fire cutting system for the oil-gas well is characterized by comprising the following steps of:
before cutting, the first moving platform moves to a position far away from a wellhead, and the second moving platform conveys the laser cutting head to a position close to the wellhead;
when cutting, the laser cutting head outputs compound laser to the outer surface of the wellhead, the second moving platform moves around the wellhead to perform primary cutting and form a first cutting seam, the depth of the first cutting seam is smaller than the wall thickness of the wellhead, the laser cutting head outputs continuous laser to the outer surface of the wellhead, the second moving platform moves around the wellhead to perform secondary cutting and form a second cutting seam on the basis of the first cutting seam, the sum of the depths of the first cutting seam and the second cutting seam is equal to the wall thickness of the wellhead, the first cutting seam is a closed annular cutting seam, the second cutting seam is a non-closed annular cutting seam, and the wellhead is inclined towards the direction without forming the second cutting seam under the action of fluid pressure in the well.
10. The method of claim 9, wherein the composite laser is scanned in a plurality of cycles along the circumference of the wellhead during the first slit formation, the continuous laser is scanned in a single pass along the circumference of the wellhead during the second slit formation, and the continuous laser is at an angle of 40 ° -50 ° to the first slit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311544586.3A CN117381192A (en) | 2023-11-17 | 2023-11-17 | Laser remote fire cutting system for oil-gas well and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311544586.3A CN117381192A (en) | 2023-11-17 | 2023-11-17 | Laser remote fire cutting system for oil-gas well and use method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117381192A true CN117381192A (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311544586.3A Pending CN117381192A (en) | 2023-11-17 | 2023-11-17 | Laser remote fire cutting system for oil-gas well and use method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117381192A (en) |
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2023
- 2023-11-17 CN CN202311544586.3A patent/CN117381192A/en active Pending
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