Hydraulic sand blasting cutting device for rescue of out-of-control blowout of oil and gas well

Abstract

The invention relates to the technical field of heat-resistant cutting equipment, and particularly discloses a hydraulic sand blasting cutting device for oil and gas well blowout out-of-control emergency rescues.The hydraulic sand blasting cutting device comprises double cutting heads, a centering limiting assembly and an automatic telescopic piece, and the double cutting heads are connected to the centering limiting assembly in a controlled and sliding mode through the automatic telescopic piece; the centering limiting assembly is used for centering the double cutting heads and a wellhead of an oil and gas well. According to the device, the cutting efficiency can be improved, the design of the cutting head is simplified, long-distance cutting operation is facilitated, and the safety is improved when gas well blowout out-of-control emergency rescue is carried out.

Description

Technical Field

[0001] The invention relates to the technical field of heat-resistant cutting equipment, in particular to a hydraulic sandblasting cutting device for emergency rescue of uncontrolled blowout of oil and gas wells. Background Art

[0002] After an oil and gas well blowout goes out of control, in order to eliminate the danger, it is usually necessary to first dismantle the original old wellhead and then carry out the subsequent disposal process. The old wellhead is usually dismantled by hydraulic sandblasting. Hydraulic sandblasting cutting, also known as abrasive water jet cutting, refers to adding a certain amount of abrasive particles to pure water, and ejecting a high-speed abrasive water mixed fluid through a small diameter nozzle under a high working pressure to achieve cutting of the target object.

[0003] At present, the hydraulic sandblasting cutting devices and methods used in the field of blowout rescue mainly include "Two-way linkage oil and gas wellhead hydraulic cutting device and cutting method" (publication number: CN114658382A), "Wellhead cutting device and cutting method" (publication number: CN114000846A), and "A centering device for wellhead cutting support" (publication number: CN218439292U). The above-mentioned cutting devices and methods all use a double-nozzle cutting method and are equipped with a wellhead centering device. Two-way liquid supply pipelines are used in the liquid supply pipeline. The power source device for the movement of the cutting head uses a hydraulic motor, and there is no thermal protection design specifically for high-temperature environment conditions. When cutting an uncontrolled well, the heat radiation intensity around the well can reach 600°C. The hydraulic motor is easily damaged and fails under high temperature conditions. Conventional metal materials are prone to yield deformation at high temperatures, resulting in the inability to complete the cutting of the wellhead. The dual-nozzle structural design requires two liquid supply pipelines, and a synchronous transmission mechanism must be set up to ensure that the dual-nozzle cutting is performed synchronously, which makes the front-end cutting head structural design more complicated, which is not conducive to the stable use of the device in harsh environmental conditions. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing fire-resistant and temperature-resistant protection technology of the cutting head for emergency rescue of blowout cannot meet the requirements of the hydraulic sandblasting cutting device at a heat flux density of 350-500kw / m 2 , the problem of working for a long time at an ambient temperature of 500-650℃ is solved by optimizing the cutting head design to improve the cutting efficiency.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A hydraulic sandblasting cutting device for rescuing an uncontrolled blowout in an oil and gas well comprises a double cutting head, a centering limit assembly and an automatic telescopic member, wherein the double cutting head is controlled by the automatic telescopic member to be slidably connected to the centering limit assembly, and the centering limit assembly is used to center the double cutting head with the wellhead of the oil and gas well.

[0007] In a further solution, the automatic telescopic member is connected to a multi-stage telescopic arm, and the multi-stage telescopic arm is used for long-distance and multi-stage transportation of the double cutting heads.

[0008] In a further scheme, the automatic telescopic part includes a screw, a screw sleeve, a sliding rod, a sliding rod sleeve, a multi-stage telescopic rod and a control motor, one end of the sliding rod is connected to the double cutting head and is slidably connected to the centering limit assembly, the other end is connected to the screw sleeve and is slidably connected in the sliding rod sleeve, the sliding rod sleeve is connected to the telescopic front end of the multi-stage telescopic arm, a screw is meshed and connected in the screw sleeve, the screw is connected to the telescopic front end of the multi-stage telescopic rod, each telescopic end of the multi-stage telescopic rod is respectively rotatably connected to each telescopic end of the multi-stage telescopic arm through a limiting shaft sleeve, adjacent telescopic rods of the multi-stage telescopic rod are prevented from relative rotation by limiting, and the rear end of the rod sleeve of the multi-stage telescopic rod is rotated by the control motor.

[0009] In a further solution, the screw is connected to the telescopic front end of the multi-stage telescopic rod through a universal coupling, the centering limit assembly is connected to an automatic rotating part, and is controlled by the automatic rotating part to be connected to the telescopic front end of the multi-stage telescopic arm. Preferably, the automatic rotating part includes two connecting blocks and an automatic telescopic rod that are hinged to each other, and the two connecting blocks are respectively connected to the telescopic front end of the multi-stage telescopic arm and the centering limit assembly.

[0010] In a further solution, the multi-stage telescopic arm has at least three stages.

[0011] In a further solution, the rear end of the multi-stage telescopic arm is connected to a tracked vehicle through a telescopic mechanism, and a flexible pipe storage reel is provided on the tracked vehicle, and the flexible pipe storage reel is used for unwinding and recovering the flexible spray pipe.

[0012] In a further solution, the spraying direction of the double cutting heads is inward, and the angle between the spraying directions of the double cutting heads is in the range of 70 to 90°.

[0013] In a further solution, the centering limit assembly includes a limit block and a sliding rail, the limit block is connected to the sliding rail, the double cutting head is slidably connected to the sliding rail, and the sliding rail is connected to the telescopic front end of the multi-stage telescopic arm. The limit block is preferably in a Y-shaped structure.

[0014] In a further solution, the front end of the centering limit assembly is connected to a fireproof cover, and the front and rear ends of the fireproof cover are both provided with spray devices.

[0015] In a further solution, the cutting device is used to spray an aerogel high-temperature resistant paint coating on the high-temperature contact section, a flame-retardant heat-insulating material is wrapped on the coating, and the contact section structure is made of heat-resistant steel material.

[0016] Beneficial effects of the present invention:

[0017] 1. The cutting head adopts a single nozzle and double nozzle design, and a single liquid supply pipeline is set to simplify the front-end structure of the cutting head. The integrated design ensures the synchronization of double nozzle cutting, reduces cutting time and improves cutting efficiency.

[0018] 2. It adopts multi-stage telescopic rod transmission to meet the demand for free extension and retraction of the lead screw when the multi-stage telescopic arm conveys the cutting head. It adopts lead screw transmission and controls the rotation frequency by controlling the motor, which can accurately control the extension distance, facilitate alignment with the wellhead, ensure the cutting time of the cutting point, and has good high temperature resistance. The fully mechanical transmission structure design greatly improves the use ability of the device in extreme high temperature environments.

[0019] 3. The cutting head of the hydraulic sandblasting cutting device is made of high-temperature resistant metal materials, which improves the fire resistance and temperature resistance and reliability of the hydraulic sandblasting cutting device.

[0020] 4. By applying a fire-resistant and heat-resistant coating on the outer surface of the hydraulic sandblasting cutting device, part of the heat can be blocked from entering the hydraulic sandblasting cutting device body. At the same time, the coating will reflect part of the heat, greatly reducing the heat value ultimately transferred to the operating hydraulic sandblasting cutting device body, reducing the amount of heat that the hydraulic sandblasting cutting device needs to withstand, and providing important guarantees for the hydraulic sandblasting cutting device to work for a long time in a high-temperature emergency rescue environment.

[0021] 5. The present invention adds a self-spraying device to the outside of the hydraulic sandblasting cutting device, forms a fine water curtain on the front end surface of the hydraulic sandblasting cutting device through water mist spraying, and absorbs heat through evaporation of the water mist to achieve the purpose of effectively blocking heat radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a connection diagram of a hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout in an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the connection of the double cutting heads in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection of the limit blocks in an embodiment of the present invention;

[0026] Figure 4 is a connection diagram of a control motor in an embodiment of the present invention;

[0027] Figure 5 1 is a schematic diagram of the connection of the flexible tube storage reel during the three-stage telescopic operation in an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of the connection of the three-stage telescopic rod in an embodiment of the invention;

[0029] Figure 7 yes Figure 6 Schematic diagram of the cross section at point A;

[0030] In the figure: 1. Double cutting head; 2. Centering limit assembly; 21. Limit block; 22. Sliding track; 3. Automatic telescopic part; 31. Lead screw; 32. Lead screw sleeve; 33. Sliding rod; 34. Sliding rod sleeve; 35. Multi-stage telescopic rod; 36. Control motor; 4. Multi-stage telescopic arm; 5. Automatic rotating part; 6. Telescopic mechanism; 7. Tracked vehicle; 8. Flexible pipe storage reel; 9. Sprinkler device; 10. Fireproof cover. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, a hydraulic sandblasting cutting device for rescuing an uncontrolled blowout in an oil and gas well comprises a double cutting head 1, a centering limit assembly 2 and an automatic telescopic member 3. The double cutting head 1 is slidably connected to the centering limit assembly 2 through the automatic telescopic member 3, and the centering limit assembly 2 is used to center the double cutting head 1 with the wellhead of the oil and gas well.

[0033] Its working principle is to adopt a double cutting head 1 and a centering limit assembly 2, so that the double cutting head 1 can be centered along the wellhead of the oil and gas well during cutting. The double cutting head 1 can be automatically retracted and extended during the centering cutting by an automatic telescopic member 3, and can feed and cut both sides of the wellhead of the oil and gas well, thereby ensuring the synchronization of the double nozzle cutting. A single-channel liquid supply pipeline can be used for liquid supply, thereby simplifying the front-end structure of the cutting head.

[0034] The automatic telescopic member 3 is connected to the multi-stage telescopic arm 4, which is used for long-distance multi-stage transportation of the double cutting head 1. This can make it possible to extend the double cutting head 1 over a long distance, reduce the workload of personnel, prevent the device from being too close to the oil and gas well, and require more heat-resistant parts, and facilitate the arrangement of the driving parts in the automatic telescopic member 3, such as the arrangement of some control circuits of the control motor, so that it can be away from high-temperature areas.

[0035] like Figure 2As shown, the automatic telescopic member 3 includes a lead screw 31, a lead screw sleeve 32, a sliding rod 33, a sliding rod sleeve 34, Figure 1 The multi-stage telescopic rod 35 shown and Figure 5 The control motor 36 shown in FIG. Figure 1 , Figure 2 and Figure 5 As shown, one end of the sliding rod 33 is connected to the double cutting head 1 and is slidably connected to the centering limit assembly 2, and the other end is connected to the lead screw sleeve 32 and is slidably connected in the sliding rod sleeve 34. The sliding rod sleeve 34 is connected to the telescopic front end of the multi-stage telescopic arm 4. The lead screw sleeve 32 is meshed with a lead screw 31, and the lead screw 31 is connected to the telescopic front end of the multi-stage telescopic rod 35. Each telescopic end of the multi-stage telescopic rod 35 is respectively connected to each telescopic end of the multi-stage telescopic arm 4 through a corresponding rotation sleeve. The multi-stage telescopic arm 4 and the multi-stage telescopic rod 35 are telescopically and synchronously telescopic. The adjacent telescopic rods of the multi-stage telescopic rod 35 are prevented from relative rotation by limiting. The lead screw sleeve 32 transmits power through the lead screw 31 and slides on the lead screw 31, thereby driving the sliding rod 33 connected thereto to slide in the sliding rod sleeve 34, and the sliding rod 33 drives the double cutting head 1 to move forward and backward to achieve cutting. A multi-stage telescopic structure is designed. The multi-stage telescopic rod 35 is limited by a spline and is installed under the multi-stage telescopic arm 4. It is connected to the multi-stage telescopic arm 4 through a shaft sleeve, which meets the transmission requirements and realizes simultaneous telescopic extension and retraction with the multi-stage telescopic arm 4. The rear end of the rod sleeve of the multi-stage telescopic rod 35 is rotated by the control motor 36 to transmit power to the screw 31 at the front end of the multi-stage telescopic rod 35. The control motor 36 can be installed on the fixed end of the multi-stage telescopic arm 4.

[0036] The lead screw 31 is connected to the telescopic front end of the multi-stage telescopic rod 35 through a universal coupling 37. The universal coupling 37 can facilitate the transmission when the lead screw 31 and the multi-stage telescopic rod 35 rotate at a relative angle, which is more convenient for the installation of the two and meets the requirements of vertical relative rotation of the two, so that the double cutting head 1 can be used for vertical micro-movement. The centering limit assembly 2 is controlled by the automatic rotating part 5 and is connected to the telescopic front end of the multi-stage telescopic arm 4. Preferably, the automatic rotating part 5 includes two connecting blocks and an automatic telescopic rod hinged to each other. The two connecting blocks are respectively connected to the telescopic front end of the multi-stage telescopic arm 4 and the centering limit assembly 2.

[0037] The multi-stage telescopic arm 4 has at least three stages. The rear end of the multi-stage telescopic arm 4 is connected to a crawler vehicle 7 through a telescopic mechanism 6. The crawler vehicle 7 is provided with a flexible pipe storage reel 8, which is used for unwinding and recovering the flexible spray pipe. Figure 4 As shown, the spray cooling pipeline is fixed above the multi-stage telescopic arm 4, as shown in FIG. Figure 5As shown, the three-stage multi-stage telescopic arm 4 is provided with a spray pipeline, and the pipelines are installed in a staggered manner. In order to realize the free contraction of the multi-stage telescopic arm 4 without affecting the retraction of the spray pipeline, the spray pipeline connection hose above the multi-stage telescopic arm 4 is provided with a three-stage separate recovery mode when the multi-stage telescopic arm 4 is extended. The hose line connected to the first-stage multi-stage telescopic arm 4 is fixed, and no special storage reel is provided. The hose lines connected to the second-stage multi-stage telescopic arm 4 and the third-stage multi-stage telescopic arm 4 are separately provided with independent curling and storage. The hydraulic sandblasting cutting pipeline uses a flexible pipeline, and a storage reel is provided at the rear end, which can be freely extended and retracted with the multi-stage telescopic arm 4. The connecting flange can also be used to connect the double nozzle cutting head and the screw sleeve. For wellheads of different sizes, the connecting flange can be connected to cutting heads of different sizes.

[0038] like Figure 3 As shown, the spray direction of the double cutting head 1 is inward, and the angle between the spray directions of the double cutting head 1 is 70-90°. The jet angle between the nozzles is 70-90°, which avoids the mutual interference and impact of the left and right sprayed fluids, and reduces the mutual impact and interference between the fluids when not cutting. The nozzle structure is integrated and only one liquid supply pipeline is required.

[0039] The centering limit assembly 2 includes a limit block 21 and a sliding track 22. The limit block 21 is connected to the sliding track 22. The sliding track is used for the cutting head 1 to slide. The double cutting head 1 is slidably connected to the sliding track 22. Figure 1 As shown, the sliding track 22 is connected to the telescopic front end of the multi-stage telescopic arm 4, and is used to connect the automatic telescopic member 2. The limit block 21 is used for alignment with the old wellhead, and the front end such as a Y-shaped fork is closely attached to the outer surface of the well wall to achieve centering. During the forward and backward movement of the cutting head, the sliding track 22 is used to provide support and guidance for the double nozzle cutting head.

[0040] The front end of the centering limit assembly 2 is connected with a fireproof cover 10, and the front and rear ends of the fireproof cover 10 are both provided with a spray device 9. The spray device 9 can be connected to a spray system using an existing nozzle, a nozzle, etc., and is used to form a fine water curtain on the front surface of the hydraulic sandblasting cutting device.

[0041] The cutting device is used to spray the high-temperature contact section with aerogel high-temperature resistant coating and wrap it with flame-retardant heat-insulating material, and the contact section structure is made of heat-resistant steel material.

[0042] A triple thermal protection technical solution combining "heat-resistant metal material + fire-resistant and heat-resistant coating + self-spraying system". First, a self-spraying device 9 is installed on the hydraulic sandblasting cutting device. During cutting, a fine water curtain is formed on the outer surface of the cutting device near the wellhead through a nozzle spray, which effectively blocks thermal radiation. At the same time, during the hydraulic sandblasting cutting operation, the flow of fluid in the liquid supply pipeline can also take away part of the heat, further reducing the heat transferred from the external environment to the coating surface and the cutting head, and the ambient temperature drops from 600°C to 500°C. On this basis, by spraying a fire-resistant and heat-resistant coating on the outer surface of the hydraulic sandblasting cutting device, which is resistant to temperatures of 600°C to 1500°C, part of the heat is blocked from entering the material body of the hydraulic sandblasting cutting device, while reflecting part of the heat, and wrapping aerogel flame-retardant and heat-insulating materials in positions such as legs and connecting brackets, which greatly blocks the heat that the hydraulic sandblasting cutting device needs to bear. The heat-resistant steel of the front cutting head of the hydraulic sandblasting cutting device can be made of martensitic heat-resistant steel P91, which can be used at a temperature of up to 650°C, or austenitic heat-resistant steel Super 304H, which can be used at a temperature of up to 700°C. As a fire-resistant and heat-resistant metal material, the fire-resistant and heat-resistant performance of the hydraulic sandblasting cutting device is significantly improved. The present invention can meet the thermal protection requirements of the hydraulic sandblasting cutting device for continuous operation for 6 hours and continuous flame burning for 30 minutes at an ambient temperature of 600°C.

[0043] During specific use, the cutting head delivery device adopts a multi-stage telescopic arm 4, which extends a long arm at a distance from the wellhead to deliver the front cutting head to the wellhead; the limit block 21 is used to center the double cutting head 1 at the wellhead. Before starting cutting, the double nozzle double cutting head 1 is in an unextended state. At this time, the limit block 21 is first centered with the wellhead. After the centering is completed, the cutting head is extended to start cutting. The centering process can ensure that the double nozzle double cutting head 1 is centered and aligned with the wellhead to be cut, thereby preventing the wellhead from colliding with the cutting head.

[0044] When the old wellhead is cut, the multi-stage telescopic rod 35 is extended together with the multi-stage telescopic arm 4. When the cutting head is close to the wellhead, the stopper 21 is used to center with the wellhead. After the Y-shaped fork is completely fitted with the outer wall of the wellhead, the nozzle high-speed jet is turned on, and the rear motor drives the lead screw 31 to rotate and transmit power to the front lead screw sleeve 32. The lead screw converts the rotational motion into the linear motion of the double nozzle double cutting head 1. After the double nozzle cutting head moves to the rear side of the wellhead, the motor 36 is controlled to rotate in the reverse direction. The double cutting head 1 moves in the reverse direction and starts cutting the wellhead from the back to the front. The high-speed airflow or ignited flame ejected from the incision caused by cutting from the rear side of the wellhead will not affect the operation directly in front of the wellhead. If cutting is started from the front, the airflow ejected from the incision will directly impact the hydraulic sandblasting cutting device for the front operation.

[0045] Heat-resistant steel can ensure that the front end of the cutting device can withstand the high temperature generated by the heat radiation around the well. Heat-resistant steel such as martensitic heat-resistant steel P91 or austenitic heat-resistant steel Super 304H is used as the metal material of the fireproof cover 10, the centering limit assembly 2, the double cutting head 1, the sliding track 22, the connecting flange, the screw sleeve, and the screw. P91 steel (C~0.1%, Si~0.3%, Mn~0.5%, Cr~8.5%, Mo~1%, Al~0.4%, Ni~0.4%, V~0.2%, Nb~0.08%, N~0.05%) has good comprehensive mechanical properties, welding properties and process properties, high endurance strength and oxidation resistance. The use temperature of this material can reach 650℃, and the optimal use temperature can reach 585~625℃, and it can work continuously for a long time. The yield strength of P91 at room temperature is 500MPa, and the yield strength at 600℃ for a short time is 390MPa. Super 304H (C~0.1%, Si~0.22%, Mn~0.85%, Cr~18.4%, Ni~0.26%, Mo~0.26%, Cu~2.41%, Nb~0.48%) has excellent long-lasting strength, corrosion resistance, oxidation resistance and weldability, and the maximum operating temperature is 700℃. Super 304H has a yield strength of 385MPa at room temperature and a yield strength of 230MPa at 600℃ for a short time.

[0046] Secondly, the aerogel high temperature resistant coating is used to passively protect the hydraulic sandblasting cutting device. The fireproof cover 10, the sliding track 22, the screw sleeve and the screw of the high pressure hydraulic sandblasting cutting device are sprayed with SiO2 aerogel high temperature resistant coating and wrapped with flame retardant and heat insulating materials to improve the fire resistance and temperature resistance of the hydraulic sandblasting cutting device. Aerogel has a high specific surface area (200m 2 / g~1000m 2 / g), low bulk density (as low as 3kg / m 3 ), extremely low thermal conductivity (thermal conductivity as low as 0.013W / m·K), low temperature and high temperature resistance (~200℃~1400℃), etc. There are many types of aerogels, among which SiO2 aerogel is the most widely used and one of the best thermal insulation aerogels, with high porosity (80.0%~99.8%), large specific surface area (500~1200m 2 / g), extremely low density (0.03g / cm 3 ), with a small thermal conductivity of 0.005W / (m·K) and an average pore size of 50nm, which is lower than the mean free path of air molecules, and can effectively inhibit heat conduction, heat convection and heat radiation. By modifying SiO2 aerogel, a transparent thermal insulation coating is prepared. When the SiO2 aerogel content is 4% to 5%, the thermal insulation temperature difference of the coating is as high as 10°C, and the thermal conductivity is as low as 0.08W / (m·K), which has a good thermal insulation effect.

[0047] In terms of active cooling, a self-spraying system is installed outside the operating hydraulic sandblasting cutting device. By spraying fine water mist (<400μm), a water mist spraying surface is formed on the surface of the hydraulic sandblasting cutting device. The fine water mist evaporates in a high temperature environment to take away the heat. The radiation heat blocking effect can reach about 70%, which greatly reduces the heat radiation received by the hydraulic sandblasting cutting device. In order to block the heat radiation to the maximum extent, a single nozzle sprays water mist in an umbrella shape to maximize the coverage of the water mist and ensure that the structure to be protected is located within the spraying water mist area. The height of the fine water mist spray is not less than 30cm to ensure effective heat blocking. To ensure the density of the spraying water mist, the distance between the two nozzles does not exceed 20cm. Multiple groups of nozzles are evenly arranged on the front end of the fireproof cover 10, and fine water mist is continuously sprayed during the cutting process to form a water mist surface to block high-temperature heat radiation. At the same time, a spray pipeline is arranged on the upper part of the front connection bracket of the cutting hydraulic sandblasting cutting device, and the rear end of the pipeline is connected to the water tank at the rear of the hydraulic sandblasting cutting device through a spray pipeline. The outer surface of the spray pipe is evenly provided with multiple groups of spray holes, and the sprayed water mist is fan-shaped, which cools down the entire connecting bracket of the cutting device, the sliding track 22, the double cutting head 1, the screw sleeve and other structural parts. The spray system is provided with an external water source connector, which can directly supply water from an external water source for spraying. In addition, during the hydraulic sandblasting cutting operation, the fluid in the cutting head nozzle can also take away some heat, further reducing the heat borne by the cutting head and improving the fireproof and temperature-resistant performance.

[0048] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the orientation or positional relationship shown in the accompanying drawings.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A hydraulic sandblasting cutting device for emergency rescue of oil and gas well blowout, characterized in that: The invention comprises a double cutting head (1), a centering limit assembly (2) and an automatic telescopic component (3); the double cutting head (1) is slidably connected to the centering limit assembly (2) by means of the automatic telescopic component (3); the centering limit assembly (2) is used for centering the double cutting head (1) with the wellhead of an oil and gas well.

2. The hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout according to claim 1 is characterized in that: The automatic telescopic member (3) is connected to a multi-stage telescopic arm (4), and the multi-stage telescopic arm (4) is used for long-distance multi-stage transportation of the double cutting heads (1).

3. The hydraulic sandblasting cutting device for emergency rescue of oil and gas well blowout according to claim 2 is characterized in that: The automatic telescopic member (3) comprises a lead screw (31), a lead screw sleeve (32), a sliding rod (33), a sliding rod sleeve (34), a multi-stage telescopic rod (35) and a control motor (36); one end of the sliding rod (33) is connected to the double cutting head (1) and is slidably connected to the centering limit assembly (2); the other end is connected to the lead screw sleeve (32) and is slidably connected in the sliding rod sleeve (34); the sliding rod sleeve (34) is connected to the extension of the multi-stage telescopic arm (4). The lead screw sleeve (32) is meshed with a lead screw (31), the lead screw (31) is connected to the telescopic front end of the multi-stage telescopic rod (35), each telescopic end of the multi-stage telescopic rod (35) is correspondingly rotatably connected to each telescopic end of the multi-stage telescopic arm (4) through a limiting shaft sleeve, adjacent telescopic rods of the multi-stage telescopic rod (35) are prevented from relative rotation by limiting, and the rear end of the rod sleeve of the multi-stage telescopic rod (35) is rotated by a control motor (36).

4. The hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout according to claim 3 is characterized in that: The lead screw (31) is connected to the telescopic front end of the multi-stage telescopic rod (35) through a universal coupling (37); the centering limit assembly (2) is connected to an automatic rotating member (5) and is controlled to be connected to the telescopic front end of the multi-stage telescopic arm (4) through the automatic rotating member (5); preferably, the automatic rotating member (5) comprises two connecting blocks and an automatic telescopic rod hinged to each other, and the two connecting blocks are respectively connected to the telescopic front end of the multi-stage telescopic arm (4) and the centering limit assembly (2).

5. The hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout according to claim 2 is characterized in that: The multi-stage telescopic arm (4) has at least three stages.

6. The hydraulic sandblasting cutting device for emergency rescue of oil and gas well blowout according to claim 2 is characterized in that: The rear end of the multi-stage telescopic arm (4) is connected to a tracked vehicle (7) via a telescopic mechanism (6); a flexible pipe storage reel (8) is provided on the tracked vehicle (7); and the flexible pipe storage reel (8) is used for unwinding and recovering the flexible spray pipe.

7. The hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout according to claim 1 is characterized in that: The spraying direction of the double cutting heads (1) is inwards, and the angle between the spraying directions of the double cutting heads (1) is in the range of 70 to 90 degrees.

8. The hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout according to claim 2 is characterized in that: The centering limit assembly (2) comprises a limit block (21) and a sliding track (22), wherein the limit block (21) is connected to the sliding track (22), the double cutting head (1) is slidably connected to the sliding track (22), and the sliding track (22) is connected to the telescopic front end of the multi-stage telescopic arm (4), and the limit block (21) is preferably in a Y-shaped structure.

9. The hydraulic sandblasting cutting device for emergency rescue of oil and gas well blowout according to claim 1 is characterized in that: The front end of the centering limit assembly (2) is connected to a fireproof cover (10), and the front and rear ends of the fireproof cover (10) are both provided with spray devices (9).

10. The hydraulic sandblasting cutting device for emergency rescue of uncontrolled oil and gas well blowout according to claim 1 is characterized in that: The cutting device is used for spraying an aerogel high-temperature resistant paint coating on the high-temperature contact section, and a flame-retardant heat-insulating material is wrapped on the coating, and the contact section structure is made of heat-resistant steel material.

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