A marine hydraulic workover rig

Abstract

The present application relates to the technical field of oil and gas drilling, in particular to a marine hydraulic workover rig. Its characteristics are to provide a set of workover device for offshore platform, the derrick is double hydraulic cylinder door type structure, the derrick hydraulic cylinder is multi-gear hydraulic cylinder, which can meet the hook speed of large hook under different workover conditions, each derrick hydraulic cylinder is provided with a set of stroke sensor, which cooperates with the driller control system to realize double cylinder synchronization through compensation control, the top of the derrick hydraulic cylinder trolley is provided with a connecting beam to connect the two derrick hydraulic cylinders into one, four sets of detachable fixing limiting devices are arranged at the drill floor skid assembly and the lower base guide beam, and at the lower base and the platform deck guide beam, which improves the safety and reliability of the marine hydraulic workover rig under extreme conditions. It mainly includes a trolley, a trolley beam, a main hydraulic cylinder, a traveling block hook, a hydraulic cylinder base, a main rope, a driller house, a hydraulic station, a drill floor skid assembly, a lower base and a workover rig fixing limiting device. It has the characteristics of safety and reliability, small floor area, low equipment cost and high use efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of oil and gas drilling, specifically to a marine hydraulic workover rig. Background Technology

[0002] Offshore workover rigs are key equipment for oil and gas extraction on offshore platforms, primarily used for well workover operations during the oil production process. Offshore platforms, due to their unique environmental constraints and small footprint, mainly utilize cluster wells. Offshore workover rigs possess both longitudinal and lateral movement capabilities; the rig's lower base can move longitudinally along the platform deck rails, and the rig's drill rig skid assembly can move laterally along the lower base rails. This allows offshore workover rigs to meet the requirements of drilling and working multiple cluster wells in concentrated oilfield areas. Currently, offshore workover rigs fall into several categories.

[0003] 1. Diesel-powered marine workover rigs utilize a diesel engine that drives a winch via a torque converter, transmission box, angle box, and chain box. The winch wire rope, connected to the derrick crane, traveling block hook, and dead rope retainer, forms a hoisting system for raising and lowering the drill pipe. This type of marine workover rig requires explosion-proof diesel engines, which incur significant costs for explosion protection and ship inspection certification. Furthermore, these rigs often have large footprints due to their extensive transmission systems, long transmission paths, and high power loss rates; their exhaust emissions also contribute significantly to environmental pollution.

[0004] 2. Electric motor-driven marine workover rigs utilize a transmission box and chain box to drive a winch. The winch wire rope, along with the derrick crane, traveling block hook, and dead rope fastener, forms a hoisting system to lift and lower the drill pipe. This type of marine workover rig requires explosion-proof motors, which incur significant costs related to explosion-proof technology and ship inspection certification. Furthermore, these rigs have numerous transmission components and require a large footprint.

[0005] As users place increasing emphasis on the safety, reliability, and footprint of marine workover rigs, there is an urgent need to design a safe, stable, reliable, and compact marine hydraulic workover rig to meet users' requirements for marine workover rigs. Summary of the Invention

[0006] The purpose of this invention is to provide a marine hydraulic workover rig. The rig's hoisting system has a portal frame, and the hoisting equipment consists of main hydraulic cylinders on both sides of the frame. The main hydraulic cylinders form the hoisting system through a gantry pulley, a central pulley, a traveling block hook pulley, a main rope, and a dead rope anchor for the drill rig skid assembly, enabling the hoisting and lowering of the traveling block hook. This hydraulic workover rig's main hydraulic cylinders do not require explosion-proof certification, and compared to traditional marine workover rigs, it eliminates one winch and power transmission system. It features safety, reliability, small footprint, low equipment cost, and high efficiency.

[0007] The technical solution of this invention is:

[0008] A marine hydraulic workover rig is characterized by providing a workover device for offshore platforms. The derrick is a dual-cylinder gantry structure, with multi-position hydraulic cylinders to meet different hook speed requirements under various workover conditions. Each hydraulic cylinder is equipped with a stroke sensor, which, in conjunction with the driller's control system, compensates for and synchronizes the two cylinders. A connecting beam at the top of the derrick hydraulic cylinder trolley connects the two cylinders into one unit. Four sets of detachable and fixed limit devices are installed at the connection between the drill platform skid assembly and the lower base guide rail beam, and at the connection between the lower base and the platform deck guide rail beam, improving the safety and reliability of the marine hydraulic workover rig under extreme conditions. The marine hydraulic workover rig mainly includes:

[0009] The overhead crane is used to support the lifting and lowering loads of the workover rig. The overhead crane has a four-pulley structure, with the pulley rope grooves in contact with the main rope. The bottom of the overhead crane is bolted to the main hydraulic cylinder, and the top of the overhead crane is hinged to the overhead crane beam.

[0010] The overhead crane beam is used to connect two overhead cranes into one unit and is hinged to the top of the overhead crane.

[0011] The main hydraulic cylinder is used to raise and lower the traveling trolley hook by extending and retracting the main hydraulic cylinder. The top of the main hydraulic cylinder is bolted to the overhead crane, and the bottom of the main hydraulic cylinder is bolted to the hydraulic cylinder base. The pulley rope groove in the middle of the main hydraulic cylinder is in contact with the main rope.

[0012] The traveling block hook is used to bear the load of lifting and lowering the drill string during well workover operations. The traveling block hook rope groove is in contact with the main rope.

[0013] The hydraulic cylinder base is used to transfer the load of the main hydraulic cylinder to the drill rig skid assembly. The top of the hydraulic cylinder base is bolted to the main hydraulic cylinder, and the bottom plate of the hydraulic cylinder base is bolted to the drill rig skid assembly.

[0014] The main rope is used to bear the load of lifting and lowering the workover rig. The two ends of the main rope are hinged to the dead rope anchor of the drill rig skid assembly. The middle part of the main rope is in contact with the overhead crane pulley rope, the pulley rope groove in the middle of the main hydraulic cylinder, and the pulley rope groove of the traveling block hook.

[0015] The driller's cabin is used to send control signals to the workover rig's actuators and to display various operational status data of the workover rig. The driller's cabin is bolted to the drill rig skid assembly.

[0016] The hydraulic station is used to provide hydraulic power to the hydraulic actuators of the workover rig. The hydraulic station is bolted to the drill rig skid assembly.

[0017] The drill rig skid assembly is used to house the equipment on the drill rig surface, bear the workover load, and transfer it to the lower base. The upper part of the drill rig skid assembly is bolted to the driller's cabin, main fluid station, and hydraulic cylinder base, and hinged to the main cable. The lower part of the drill rig skid assembly contacts the upper plane of the guide rail beam of the lower base and is fixed by bolt plates.

[0018] The lower base is used to transfer the load of the drill rig skid assembly to the platform deck rails and to provide a guide rail path for the lateral movement of the drill rig skid assembly. The top of the lower base is fixed to the column surface of the drill rig skid assembly with a contact bolt plate, and the legs of the lower base are fixed to the platform guide rail surface with a contact bolt plate.

[0019] The well workover rig fixing limit device is used to fix and limit the well workover rig under extreme working conditions. The upper limit plate contacts the main column of the drilling rig skid assembly or the support leg surface of the lower base, and the lower limit plate contacts the lower base guide rail beam or the lower plane of the platform deck guide rail and the walking hole surface.

[0020] The marine hydraulic workover rig is characterized in that the main hydraulic cylinder is a multi-chamber double-acting hydraulic cylinder formed by the piston rod, the outer cylinder, and the inner guide rod, which provides a constant flow and pressure hydraulic source to a single different chamber or a combination of chambers, and can realize multiple lifting speeds of the main hydraulic cylinder.

[0021] The marine hydraulic workover rig is characterized by having a stroke sensor installed in the main hydraulic cylinder. The driller's cabin control system can obtain the extension stroke data of the two main hydraulic cylinders through the stroke sensor, and adjust the flow rate of the faster hydraulic cylinder according to the stroke deviation to keep the two main hydraulic cylinders in a synchronized state.

[0022] The aforementioned marine hydraulic workover rig is characterized in that the workover rig's fixed limiting device is a detachable structure, the lower limiting plate is a T-shaped plate structure that passes through the guide rail walking hole, and the upper limiting plate is a knife-shaped plate structure. The upper limiting plate presses against the outer bottom plate of the column and is fixedly connected to the lower limiting plate by bolts, thereby realizing the fixed limiting of the workover rig under extreme working conditions.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The power component of the marine hydraulic workover rig lifting system is the portal derrick main hydraulic cylinder, which does not require explosion-proof certification, thus reducing equipment costs.

[0025] 2. The main hydraulic cylinder of the marine hydraulic workover rig hoisting system is integrated into the portal derrick, which reduces the number of winches and power transmission devices compared to traditional marine workover rigs. It has a smaller footprint, higher energy efficiency, and lighter weight.

[0026] 3. The main hydraulic cylinder adopts a multi-speed hydraulic cylinder, which can achieve multiple lifting speeds by controlling the oil inlet of different chambers while keeping the flow and pressure of the hydraulic system constant, so as to meet the working conditions of the workover rig and improve the service life of the hydraulic system.

[0027] 4. The hydraulic workover rig's main hydraulic cylinder control adopts a stroke monitoring and synchronous compensation system to achieve synchronous lifting and lowering of the two main hydraulic cylinders.

[0028] 5. The workover rig is equipped with a fixed limit device, which provides a second layer of protection for the workover rig under extreme working conditions and improves the safety and reliability of the equipment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 yes Figure 1 The left view. Detailed Implementation

[0031] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 , Figure 2 As shown, a marine hydraulic workover rig provides a workover device for offshore platforms. The derrick is a double hydraulic gantry structure, and the derrick cylinders are multi-position cylinders to meet different hook speed requirements under various workover conditions. Each derrick cylinder is equipped with a stroke sensor, which works in conjunction with the driller's control system to achieve synchronous control of the two cylinders. A connecting beam is installed on the top of the derrick cylinder trolley to connect the two derrick cylinders into one unit. A set of detachable fixed limiting devices is installed at the connection between the drill platform skid assembly and the lower base guide beam, and at the connection between the lower base and the deck guide beam, to improve the safety and reliability of the marine hydraulic workover rig under extreme conditions. The hydraulic workover rig mainly includes a trolley 1 (2 units), a trolley crossbeam 2, main hydraulic cylinders 3 (2 units), a traveling block hook 4, a cylinder base 5 (2 units), main ropes 6 (4 units), a driller's cabin 7, a hydraulic station 8, a drill platform skid assembly 9, a lower base 10, and workover rig fixed limiting devices 11 (8 units). The bottom of the overhead crane 1 (2 units) is bolted to the top of the main hydraulic cylinders 3 (2 units). The overhead crane beam 2 is hinged to the top of the overhead crane 1 (2 units). The lower part of the main hydraulic cylinders 3 (2 units) is bolted to the top of the hydraulic cylinder base 5 (2 units). The bottom of the hydraulic base 5 (2 units) is bolted to the drill platform skid assembly 9. The main ropes 6 (4 units) are in contact with the pulley rope grooves of the overhead crane 1 (2 units), the middle pulley rope grooves of the main hydraulic cylinders 3 (2 units), and the pulley rope grooves of the traveling block hook 4. The two ends of the main ropes 6 (4 units) are hinged to the drill platform skid assembly 9. The driller's cabin 7 is connected to the drill platform skid. The assembly is fixed with bolts 9, the hydraulic station 8 is fixed with bolts to the drill rig skid assembly 9, the drill rig skid assembly 9 is fixed with the guide rail beam surface of the lower base 11 by bolt pressure plates, the lower base 11 is fixed with the guide rail surface of the platform deck by bolt pressure plates, the upper limit plate of the workover rig fixed limit device 10 (4 units) contacts the column surface of the drill rig skid assembly, the lower limit plate contacts the lower plane of the guide rail beam of the lower base and the walking hole surface, the upper limit plate of the workover rig fixed limit device 10 (4 units) contacts the leg surface of the lower base, and the lower limit plate contacts the lower plane of the guide rail of the platform deck and the walking hole surface.

[0033] During operation, the extension and retraction of the main hydraulic cylinders 3 (2 units) causes the overhead cranes 1 (2 units) to move up and down, thereby enabling the lifting and lowering of the traveling crane hook 4.

Claims

1. A marine hydraulic workover rig, characterized in that: This system provides a well workover rig for offshore platforms. The derrick features a dual-cylinder gantry structure with multi-position hydraulic cylinders to accommodate varying hook speeds under different workover conditions. Each cylinder is equipped with a stroke sensor, which works in conjunction with the driller's control system to achieve synchronous control between the two cylinders. A connecting beam at the top of the derrick's overhead crane links the two cylinders together. Four detachable and fixed limit devices are installed at the connection points between the drill platform skid assembly and the lower base guide rail beam, and between the lower base and the platform deck guide rail beam, to enhance the safety and reliability of the offshore hydraulic workover rig under extreme conditions. The offshore hydraulic workover rig mainly includes: The overhead crane is used to support the lifting and lowering loads of the workover rig. The overhead crane has a four-pulley structure, with the pulley rope grooves in contact with the main rope. The bottom of the overhead crane is bolted to the main hydraulic cylinder, and the top of the overhead crane is hinged to the overhead crane beam. The overhead crane beam is used to connect two overhead cranes into one unit and is hinged to the top of the overhead crane. The main hydraulic cylinder is used to raise and lower the traveling block hook by extending and retracting the main hydraulic cylinder. The top of the main hydraulic cylinder is bolted to the overhead crane, and the bottom of the main hydraulic cylinder is bolted to the hydraulic cylinder base. The pulley rope groove in the middle of the main hydraulic cylinder is in contact with the main rope. The traveling block hook is used to bear the load of lifting and lowering the drill string during well workover operations. The traveling block hook rope groove is in contact with the main rope. The hydraulic cylinder base is used to transfer the load of the main hydraulic cylinder to the drill rig skid assembly. The top of the hydraulic cylinder base is bolted to the main hydraulic cylinder, and the bottom plate of the hydraulic cylinder base is bolted to the drill rig skid assembly. The main rope is used to bear the load of lifting and lowering the workover rig. The two ends of the main rope are hinged to the dead rope anchor of the drill rig skid assembly. The middle part of the main rope is in contact with the overhead crane pulley rope, the pulley rope groove in the middle of the main hydraulic cylinder, and the pulley rope groove of the traveling block hook. The driller's cabin is used to send control signals to the workover rig's actuators and to display various operational status data of the workover rig. The driller's cabin is bolted to the drill rig skid assembly. The hydraulic station is used to provide hydraulic power to the hydraulic actuators of the workover rig. The hydraulic station is bolted to the drill rig skid assembly. The drill platform skid assembly is used to arrange the equipment on the drill platform, bear the well workover load and transfer it to the lower base. The upper part of the drill platform skid assembly is bolted to the driller's cabin, main fluid station and fluid cylinder base, and hinged to the main rope; the lower part of the drill platform skid assembly contacts the upper plane of the guide rail beam of the lower base and is fixed by bolt pressure plates. The lower base is used to transfer the load of the drill rig skid assembly to the platform deck rails and provide a guide rail path for the lateral movement of the drill rig skid assembly. The top of the lower base is fixed to the column surface of the drill rig skid assembly with a contact bolt plate, and the legs of the lower base are fixed to the platform guide rail surface with a contact bolt plate. The well workover rig fixing limit device is used to fix and limit the well workover rig under extreme working conditions. The upper limit plate contacts the main column of the drilling rig skid assembly or the support leg surface of the lower base, and the lower limit plate contacts the lower base guide rail beam or the lower plane of the platform deck guide rail and the walking hole surface.

2. The marine hydraulic workover rig as described in claim 1, characterized in that the main... The hydraulic cylinder is a multi-chamber double-acting hydraulic cylinder formed by the piston rod, outer cylinder, and inner guide rod. It provides a constant flow and pressure hydraulic source for a single different chamber or a combination of chambers, and can realize multiple lifting speeds of the main hydraulic cylinder.

3. The marine hydraulic workover rig as described in claim 1, characterized in that the main... The hydraulic cylinders are equipped with stroke sensors. The driller's cabin control system can obtain the extension stroke data of the two main hydraulic cylinders through the stroke sensors, and adjust the flow rate of the faster hydraulic cylinder according to the stroke deviation to keep the two main hydraulic cylinders in a synchronized state.

4. The marine hydraulic workover rig as described in claim 1, characterized in that: The workover rig's fixed limiting device is a detachable structure. The lower limiting plate is a T-shaped plate structure that passes through the guide rail walking hole, while the upper limiting plate is a knife-shaped plate structure. The upper limiting plate presses against the outer bottom plate of the column and is fixedly connected to the lower limiting plate by bolts, thereby achieving fixed limiting of the workover rig under extreme working conditions.

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