Ground well repair casing cutting machine based on hydraulic control

Abstract

A ground workover casing cutting machine based on hydraulic control belongs to the technical field of cutting devices and comprises a supporting frame, a band saw cutting device, a driving mechanism, a clamping mechanism and a hydraulic station, a vertically-through U-shaped groove is formed in the front end of the supporting frame and used for penetrating a wellhead casing, the band saw cutting device is arranged at the top end of the supporting frame and located on the rear side of the U-shaped groove, and the driving mechanism is used for driving the band saw cutting device to rotate. The band saw cutting device is connected with the top end of the supporting frame in a sliding mode and moves along an upper port of the U-shaped groove under driving of the driving mechanism, the clamping mechanisms are arranged on the two sides of the middle of the U-shaped groove and fixedly connected with the supporting frame, and the clamping mechanisms are connected with the hydraulic station. The wellhead casing cutting device can effectively improve the cutting quality and cutting efficiency of wellhead casing cutting, has universality, can be suitable for cutting wellhead casings of various models, and can reduce the safety risk of cutting operation.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield well repair cutting devices, and specifically relates to a ground well repair casing cutting machine based on hydraulic control. Background Art

[0002] During oil production, the casing in the well is damaged by fatigue or due to casing defects, cementing quality problems, casing corrosion, etc., which can easily affect normal oil and gas recovery or cause serious accidents. In order to avoid more serious accidents such as well collapse and drill stuck, the casing needs to be cut and salvaged in time and replaced with a new one.

[0003] At present, drilling teams have many ways to choose when cutting the casing at the wellhead of an oil well, and the commonly used methods include energy-gathering cutting, chemical cutting, hydraulic cutting, and mechanical cutting. Energy-gathering cutting uses special explosives to spray out special powders to cut off the pipe string, but the cut surface is extremely irregular. Chemical cutting operations are restricted by the control of pyrotechnics and highly toxic chemicals, and have low efficiency and a small scope of application. Due to the high content of flammable oil and gas components at the wellhead, it is very easy to cause fires and deflagrations, causing huge safety hazards. In addition, professional cutting machines need to be customized, which is costly and inefficient. In summary, the existing cutting methods have the defects of lack of pertinence, poor versatility, low cutting quality, safety hazards, and high costs. Utility Model Content

[0004] In view of the problems of the prior art, the present invention discloses a ground well repair casing cutting machine based on hydraulic control, aiming to solve the defects of the existing cutting methods such as lack of pertinence, poor versatility, low cutting quality, potential safety hazards and high cost.

[0005] To achieve the above purpose, the technical solution of this novel invention is:

[0006] A ground well repair casing cutting machine based on hydraulic control includes a support frame, a band saw cutting device, a driving mechanism, a clamping mechanism, and a hydraulic station. The front end of the support frame is provided with a U-shaped groove that passes through the wellhead casing from top to bottom. The U-shaped groove is used to pass through the wellhead casing. A band saw cutting device is provided at the top of the support frame and at the rear side of the U-shaped groove. The band saw cutting device is slidably connected to the top of the support frame and moves along the upper end of the U-shaped groove under the drive of the driving mechanism. The clamping mechanism is provided on both sides of the middle of the U-shaped groove and is fixedly connected to the support frame. The clamping mechanism is connected to the hydraulic station.

[0007] Preferably, linear guide rails are provided at the top of the support frame and on both sides of the U-shaped groove, the bottom end of the band saw cutting device is slidably connected to the linear guide rails through a slider, the driving mechanism includes an electric push rod fixedly provided at the top of the support frame where the rear side of the band saw cutting device is located, the fixed end of the electric push rod is fixedly connected to the top of the support frame, and the telescopic end is fixedly connected to the rear end of the band saw cutting device, the electric push rod drives the band saw cutting device to move along the linear guide rail and the moving distance is sufficient to cut the casing.

[0008] Preferably, the support frame includes a frame structure welded from rod-shaped workpieces, a U-shaped groove is formed at the front end of the frame structure, a top plate is provided at the top of the frame structure, a support plate is provided in the middle of the frame structure, a bottom plate is provided at the bottom of the frame structure, and the linear guide rail is provided on the upper surface of the top plate.

[0009] Preferably, the clamping mechanism comprises a hydraulic cylinder, which is connected to the hydraulic station via an oil pipe, and the piston rod end of the hydraulic cylinder is arranged toward the U-shaped groove and fixedly connected with a clamping assembly, and the clamping assemblies on both sides of the U-shaped groove are opposite to each other and used in combination.

[0010] Preferably, the hydraulic cylinder is fixedly connected to the support plate via a fixing seat, the clamping assembly is a die structure that is V-shaped in a top view, and the width of the U-shaped groove is suitable for sleeves of various outer diameters to pass through.

[0011] Preferably, it also includes a cooling mechanism, which includes a cooling cylinder fixed on the upper surface of the base plate, wherein coolant is stored in the cooling cylinder, an output port of the cooling cylinder is connected to a liquid outlet pipe, a pressure pump is provided on the liquid outlet pipe, and a coolant nozzle is provided at the end of the liquid outlet pipe.

[0012] Preferably, the cooling liquid nozzle is opposite to the cutting part of the sleeve, and the bottom end of the support frame is provided with a universal wheel with a brake.

[0013] Preferably, it also includes a controller, and the controller is configured to control the control circuits of the electric push rod and the hydraulic cylinder.

[0014] The beneficial effects of the new hydraulically controlled surface well repair casing cutting machine are:

[0015] 1. Engineering practicality of this new structure: At present, most casing cutting tools are operated along with drilling tools, and are basically used more underground than on the well. The cutting device on the drilling rig well is too simple and unsystematic, and cannot effectively realize the functions of clamping, driving, feeding, cooling circulation, etc. This new structure effectively solves the above problems and has high practical value.

[0016] 2. The economy and versatility of the new cutting machine: Most of the current wellhead cutting tools are handheld electric cutting machines (grinding wheels) and hand saws, which cannot meet the needs of on-site safe operations. Professional cutting machines need to be customized, which is costly and inefficient. This new model effectively solves this problem by using a universal cutting tool - a band saw cutting device, which can ensure the economy and versatility of the cutting machine.

[0017] 3. This new type can improve the safety of cutting: traditional wellhead cutting operations are extremely dangerous, and it is difficult for workers to operate in a standardized manner, and the stability of the cutting operation cannot be guaranteed; the use of hydraulic control can ensure the stability of the casing during cutting, and the use of remote oil circuit control and remote control of the electric push rod through cables and control panels can realize remote control operations at the wellhead, reducing the operating risks of workers.

[0018] 4. During the cutting operation of the new type, sparks and explosions can be avoided by spraying coolant, and the feed speed of the band saw cutting device and the clamping force of the clamping mechanism can be effectively controlled, thereby improving the cutting quality on the basis of safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , schematic diagram of the overall structure of the new model.

[0020] Figure 2 , a top view layout diagram of the positional relationship among the new band saw cutting device, linear guide rail and driving mechanism.

[0021] Figure 3 , a schematic diagram of the structure of the new clamping mechanism.

[0022] 1. Band saw cutting device; 2. Driving mechanism; 3. Clamping mechanism; 4. Hydraulic station; 5. Bottom plate; 6. Support frame; 7. Band saw; 8. U-shaped groove; 9. Support plate; 10. Linear guide rail; 11. Hydraulic cylinder; 12. Clamping assembly. DETAILED DESCRIPTION

[0023] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0024] The following embodiments may be understood as a part of a local structure or method that is expressed separately in the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0025] Example 1

[0026] Hydraulically controlled surface well casing cutting machine, such as Figure 1-3As shown, it includes a support frame 6, a band saw cutting device 1, a driving mechanism 2, a clamping mechanism 3, and a hydraulic station 4. The front end of the support frame 6 is provided with a U-shaped groove 8 that passes through the top and bottom. The U-shaped groove is used to pass through the wellhead casing (it is a commonly used structure, so it is not drawn in the figure). A band saw cutting device 1 is provided at the top of the support frame 6 and at the rear side of the U-shaped groove 8. The band saw cutting device 1 is slidably connected to the top of the support frame 6 and moves along the upper end of the U-shaped groove 8 under the drive of the driving mechanism 2. The clamping mechanism 3 is provided on both sides of the middle part of the U-shaped groove 8 and is fixedly connected to the support frame 6. The clamping mechanism 3 is connected to the hydraulic station 4.

[0027] Example 2

[0028] like Figure 1 As shown, linear guide rails 10 are provided at the top of the support frame 6 and on both sides of the U-shaped groove 8, the bottom end of the band saw cutting device 1 is slidably connected to the linear guide rails 10 through a slider, and the driving mechanism 2 includes an electric push rod fixedly arranged at the top of the support frame 6 at the rear side of the band saw cutting device 1, the fixed end of the electric push rod is fixedly connected to the top of the support frame 6, and the telescopic end is fixedly connected to the rear end of the band saw cutting device 1, and the electric push rod drives the band saw cutting device 1 to move along the linear guide rails 10 and the moving distance is sufficient to cut the casing.

[0029] Example 3

[0030] like Figure 1 As shown, the support frame 1 includes a frame structure welded from rod-shaped workpieces (such as angle steels), a U-shaped groove 8 is formed at the front end of the frame structure, a top plate is provided at the top of the frame structure, a support plate 9 is provided in the middle of the frame structure, a bottom plate 5 is provided at the bottom of the frame structure, and the linear guide rail 10 is provided on the upper surface of the top plate.

[0031] Example 4

[0032] like Figure 1 , 3 As shown, the clamping mechanism 3 includes a hydraulic cylinder 11, which is connected to the hydraulic station 4 through an oil pipe. The piston rod end of the hydraulic cylinder 11 is arranged toward the U-shaped groove 8 and is fixedly connected with a clamping assembly 12. The clamping assemblies 12 on both sides of the U-shaped groove 8 are opposite to each other and are used in combination to clamp and fix the casing.

[0033] Example 5

[0034] like Figure 1 , 3 As shown, the hydraulic cylinder 11 is fixedly connected to the support plate 9 through a fixing seat, the clamping assembly 12 is a V-shaped die structure in a top view, and the width of the U-shaped groove 8 is suitable for the passing of casings of various outer diameters. Therefore, the new model can be adapted to the cutting of various types of casings.

[0035] Example 6

[0036] like Figure 1 As shown, it also includes a cooling mechanism, which includes a cooling cylinder (a commonly used structure, not shown in the figure) fixed on the upper surface of the base plate 5, wherein coolant is stored in the cooling cylinder, and an output port of the cooling cylinder is connected to a liquid outlet pipe, a pressure pump is provided on the liquid outlet pipe, and a coolant nozzle is provided at the end of the liquid outlet pipe.

[0037] like Figure 1 As shown, the cooling liquid nozzle is opposite to the cutting part of the sleeve, and the bottom end of the support frame 6 is provided with a universal wheel with a brake to facilitate the movement and positioning of the device.

[0038] Example 7

[0039] like Figure 1 As shown, it also includes a controller, and the controller is configured to control the control circuits of the electric push rod and the hydraulic cylinder.

[0040] In this embodiment, the function of the cooling mechanism is to reduce the temperature during the cutting process to avoid the occurrence of fire and explosion.

[0041] When the new type is used, the support frame is pushed to one side of the wellhead casing, the casing is passed through the U-shaped groove, the hydraulic cylinder is started, the casing is fixed by the clamping assembly, and then the electric push rod is started to cut the casing by the band saw cutting device. During the cutting process, coolant is output through the pressure pump to avoid sparks and explosions.

[0042] The novel clamping mechanism is provided with a die structure which is V-shaped in a top view, has universality, can adapt to the stable clamping of various types of casings, ensures the stability of the casings during the cutting process, and is conducive to improving the cutting quality.

[0043] Since the electric push rod has a fast movement speed and is not suitable for the cutting process, the present invention can effectively control the extension and retraction speed of the electric push rod during the cutting process through the controller to adapt to the actual cutting. How the controller controls the electric push rod is a common technology, which will not be described in detail in this invention. At the same time, under the control of the controller, the hydraulic cylinder controls the extension and retraction speed and length according to the construction needs (how the controller controls the extension and retraction of the hydraulic cylinder is also a common technology, which will not be described in detail) to achieve the effect of stably clamping the casing.

Claims

1. The surface well repair casing cutting machine based on hydraulic control is characterized by: It includes a support frame, a band saw cutting device, a driving mechanism, a clamping mechanism, and a hydraulic station. The front end of the support frame is provided with a U-shaped groove that passes through the top and bottom. The U-shaped groove is used to pass the wellhead casing. A band saw cutting device is provided at the top of the support frame and at the rear side of the U-shaped groove. The band saw cutting device is slidably connected to the top of the support frame and moves along the upper end of the U-shaped groove under the drive of the driving mechanism. The clamping mechanism is provided on both sides of the middle of the U-shaped groove and is fixedly connected to the support frame. The clamping mechanism is connected to the hydraulic station.

2. The hydraulically controlled surface well repair casing cutting machine according to claim 1, characterized in that: Linear guide rails are provided at the top of the support frame and on both sides of the U-shaped groove. The bottom end of the band saw cutting device is slidably connected to the linear guide rails through a slider. The driving mechanism includes an electric push rod fixedly provided at the top of the support frame where the rear side of the band saw cutting device is located. The fixed end of the electric push rod is fixedly connected to the top of the support frame, and the telescopic end is fixedly connected to the rear end of the band saw cutting device. The electric push rod drives the band saw cutting device to move along the linear guide rail and the moving distance is sufficient to cut the casing.

3. The hydraulically controlled surface well repair casing cutting machine according to claim 2, characterized in that: The support frame includes a frame structure welded from rod-shaped workpieces, a U-shaped groove is formed at the front end of the frame structure, a top plate is provided at the top of the frame structure, a support plate is provided in the middle of the frame structure, a bottom plate is provided at the bottom of the frame structure, and the linear guide rail is provided on the upper surface of the top plate.

4. The hydraulically controlled surface well repair casing cutting machine according to claim 3, characterized in that: The clamping mechanism comprises a hydraulic cylinder, which is connected to the hydraulic station through an oil pipe. The piston rod end of the hydraulic cylinder is arranged toward the U-shaped groove and is fixedly connected with a clamping assembly. The clamping assemblies on both sides of the U-shaped groove are opposite to each other and used in combination.

5. The hydraulically controlled surface well repair casing cutting machine according to claim 4, characterized in that: The hydraulic cylinder is fixedly connected to the support plate via a fixing seat, the clamping assembly is a die structure that is V-shaped in a top view, and the width of the U-shaped groove is suitable for sleeves of various outer diameters to pass through.

6. The hydraulically controlled surface well repair casing cutting machine according to claim 5, characterized in that: It also includes a cooling mechanism, which includes a cooling cylinder fixed on the upper surface of the base plate, wherein coolant is stored in the cooling cylinder, an output port of the cooling cylinder is connected to a liquid outlet pipe, a pressure pump is provided on the liquid outlet pipe, and a coolant nozzle is provided at the end of the liquid outlet pipe.

7. The hydraulically controlled surface well repair casing cutting machine according to claim 6, characterized in that: The cooling liquid nozzle is opposite to the cutting part of the sleeve, and the bottom end of the supporting frame is provided with a universal wheel with a brake.

8. The hydraulically controlled surface well repair casing cutting machine according to claim 7, characterized in that: It also includes a controller, which is configured to control the control circuits of the electric push rod and the hydraulic cylinder.

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