Low platform hydraulic drilling and servicing apparatus

Abstract

The utility model belongs to the field of petroleum drilling equipment maintenance technology, concretely relates to a low platform type hydraulic drilling repair operation device for oil well overhaul operation easy to arrange, including work platform, hydraulic swivel, hydraulic power unit, adjusting sleeve, clamping mechanism, blowout preventer group, wellhead device, height increasing tee joint, safety slide, operation control platform, ground anchor base plate and dirty liquid collection system. Work platform adopts low height integral frame structure, is convenient for arranging fast in the narrow well site, hydraulic swivel is driven by hydraulic power unit and realizes high torque low speed rotation, is used for completing the operation such as tripping in and out, grinding and milling and wellbore repair. Adjusting sleeve and clamping mechanism realize the central direction of drilling tool and stable support in cooperation, reduce the swing of drill string, improve the stability of downhole operation. The utility model greatly reduces equipment height and power consumption, is applicable to completing the drilling repair task of overhaul level under the minor repair equipment specification, and significantly improves the safety and construction efficiency of oil well overhaul operation.

Description

Technical Field

[0001] This utility model belongs to the field of oil drilling equipment maintenance technology, specifically relating to a low-platform hydraulic drilling and repair operation device that is easy to deploy for oil well overhaul operations. Background Technology

[0002] Oil well workover operations are periodic wellbore maintenance procedures implemented during oil and gas production. They typically include cleaning wax deposits and sediment from the wellbore, milling away debris, fixing stuck drill bits, grinding old packers, and repairing completion tools. Traditional workover operations are generally carried out using workover rigs, which consist of a derrick, winch, traveling block system, and power system. A mechanical rotary table is installed on the wellhead platform to provide power for drill pipe rotation, and well control devices such as blowout preventers ensure operational safety.

[0003] The existing overhaul equipment is generally tall and has a large platform, making installation and transportation significantly limited by on-site space. The mechanical turntable relies on a high-power diesel engine or power unit for drive, resulting in high energy consumption, high noise, and a large amount of maintenance work.

[0004] For example, the continuous motion oil drilling rig disclosed in patent CN105781445B reduces the time for connecting and disconnecting by continuously tripping in and out of the well, thus improving mechanization efficiency. However, it has a large height, a complex overall structure, is difficult to move, and has high requirements for on-site layout, making it unsuitable for narrow well sites or temporary working environments.

[0005] On the other hand, some casing milling operations still use screw drills, such as the milling tool disclosed in CN2667145Y. Screw drills rely on downhole fluid for propulsion, and the friction area between the drill string and the casing is large. When encountering irregular well walls or rock cuttings accumulation, the drill string is prone to getting stuck, making it difficult to lift the tool and even requiring secondary operations, which significantly affects the construction time and safety.

[0006] In summary, existing well repair and overhaul equipment generally suffers from the following shortcomings:

[0007] 1. The platform is tall and difficult to arrange, making it unsuitable for well sites with limited space;

[0008] 2. Mechanical turntables rely on large power sources, resulting in high energy consumption and complex maintenance;

[0009] 3. Using a screw drill for milling inside the casing is prone to jamming and poses a high operational risk;

[0010] 4. The equipment is inconvenient to move and is not suitable for small repair teams that frequently need to relocate.

[0011] 5. The key components are not arranged in a compact modular layout, making on-site connections cumbersome.

[0012] Therefore, there is an urgent need for a low-platform drilling and repair device that is lower in height, has a more efficient power system, a modular structure, can replace screw drills for milling operations, and is applicable to most oil and water well sites. Utility Model Content

[0013] To address the aforementioned shortcomings of existing technologies, this invention aims to solve the problem that current overhaul equipment employs a mechanical rotary table, requiring high power, resulting in a large overall size and the risk of stuck drill bits when using screw drills. The purpose of this invention is to provide a low-platform hydraulic drilling and overhaul device that uses a hydraulically driven rotary table, significantly reducing the overall height of the equipment. This allows for overhaul drilling and overhaul tasks on oil and water wells using equipment designed for minor repairs, while also requiring less space and increasing efficiency.

[0014] To achieve the above objectives, the utility model adopts the following technical solution: a low-platform hydraulic drilling and repair operation device, comprising a working platform, a hydraulic rotary table, and a blowout preventer assembly.

[0015] The working platform is mounted on the upper part of the wellhead device via a bracket. A hydraulic turntable is installed on the working platform, and the hydraulic turntable is connected to a hydraulic supply device.

[0016] The hydraulic rotary table clamps and releases the drill pipe through a gripper, and drives the drill pipe through the gripper; a blowout preventer assembly is installed below the hydraulic rotary table and between it and the wellhead device.

[0017] According to another embodiment of the utility model or any of the foregoing embodiments, the drilling and repair device further includes a bottom crossbeam installed around the wellhead device. The bottom crossbeam is fixed to the ground by ground anchors, and at least four columns are provided on the bottom crossbeam. An adjusting sleeve is fixedly connected to the bottom of the working platform. The adjusting sleeve is provided with multiple pin holes, which are connected to the columns through pin shafts to adjust the height of the working platform. The height of the working platform is generally 2.1 meters, but the height of each wellhead device and the equipped height-increasing tee is different. To ensure accurate connection, a pull-out adjusting sleeve is provided to connect to the bottom crossbeam, thereby allowing the height to be adjusted.

[0018] According to another embodiment of the utility model or any of the foregoing embodiments, the drilling and repair operation device further includes a driller's platform, which is installed on a work platform and is equipped with a safety limit baffle and a pressure gauge. The pressure gauge displays the pressure of each pipeline, and the oil circuit is switched by a control lever or button.

[0019] According to another embodiment of the utility model or any of the foregoing embodiments of the drilling and repair device, the working platform is equipped with guardrails around its perimeter, and ladders and safety slides are installed on both sides. The platform is connected to four columns on the bottom crossbeam via four adjusting sleeves and pins for positioning. The platform is surrounded by 1200mm high guardrails, which are easy to install and disassemble. To facilitate access to and from the platform, ladders are designed on the sides of the device for entering the platform, and an S-shaped safety slide is provided for quick access to the ground in case of special circumstances. The total height of the entire device platform is 2.1m, and a 4m*1.8m anti-torque chassis is provided according to actual working conditions.

[0020] According to another embodiment of the utility model or any of the foregoing embodiments of the drilling and repair device, the gripper is one of the following: hydraulic tapered slip, pneumatic slip, square drill pipe filler.

[0021] According to another embodiment of the utility model or any of the foregoing embodiments of the drilling and repair operation device, the hydraulic supply device is a power room or hydraulic station, and the hydraulic supply device drives the rotary table, conical slips and blowout preventer respectively through inlet and return oil pipelines.

[0022] According to another embodiment of the utility model or any of the foregoing embodiments, the drilling and repair operation apparatus further includes a drill pipe conveyor to provide drill pipes for drilling and repair operations.

[0023] According to another embodiment of the utility model or any of the foregoing embodiments, the drilling and repair device further includes a water collection tray, which is disposed between the hydraulic rotary table and the blowout preventer assembly. The water collection tray is used for sewage discharge via pipelines and is connected to a segmented overflow trough and a circulation tank. To prevent backflow of liquid from the wellhead from contaminating the well site, a water collection tray structure is arranged at the bottom of the platform, connected to a guide trough and a hose, allowing the wastewater to automatically flow into a wastewater tank or circulation tank on site. The collection system can operate continuously during wellhead pumping, sand flushing, milling, and cleaning operations, keeping the work area clean and improving the safety of the construction environment.

[0024] According to another embodiment of the utility model or any of the foregoing embodiments, the drilling and repair device further includes a heightening tee and a mud umbrella, wherein the heightening tee and the mud umbrella are installed between the wellhead device and the blowout preventer assembly.

[0025] According to another embodiment of the utility model or any of the foregoing embodiments of the drilling and repair device, the hydraulic turntable includes a hydraulic motor and a hydraulic brake mounted on the base. The hydraulic motor drives the intermediate rotating structure where the gripper is located through gear meshing. The intermediate rotating structure is connected to the base of the hydraulic turntable through bearings.

[0026] The beneficial effects of this utility model are:

[0027] 1. The drilling and repair device platform of this utility model has a low height and small footprint, allowing for rapid deployment in confined well sites. It uses a hydraulic rotary table instead of a mechanical rotary table and screw drill, providing stable high torque output and avoiding the problem of screw drill getting stuck.

[0028] 2. The integrated design of the working platform, hydraulic turntable, blowout preventer, clamping system and pipeline of this utility model is convenient for installation and disassembly, has low power requirements and high efficiency, significantly reduces construction costs, and is suitable for complex drilling and repair tasks such as milling and grinding of oil wells, water wells and various casings, and handling of fallen objects.

[0029] 3. This utility model uses a water collection pan connected to a circulating water tank to ensure a clean well site environment. The working platform is equipped with a ladder, safety slide, guardrail, and driller's table, making it easy to operate and highly safe. Attached Figure Description

[0030] Figure 1 This is a top view schematic diagram of the low-platform hydraulic drilling and repair device described in the utility model.

[0031] Figure 2 A side view of the low-platform hydraulic drilling and repair device of the utility model without the ladder and safety slide.

[0032] Figure 3 This is a front view schematic diagram of the low-platform hydraulic drilling and repair device described in the utility model.

[0033] Figure 4 This is a bottom view of the activated carbon adsorption component and maintenance staircase described in the utility model.

[0034] Figure 5 This is a three-dimensional enlarged schematic diagram of the hydraulic turntable and gripper described in the utility model.

[0035] Figure 6 This is an enlarged cross-sectional view of the hydraulic turntable and gripper described in the utility model.

[0036] In the diagram: 1. Hydraulic turntable; 2. Working platform; 3. Ladder; 4. Safety slide; 5. Adjusting casing; 6. Blowout preventer assembly; 7. Bottom crossbeam; 8. Heightening tee; 9. Wellhead device; 10. Clamping device; 11. Water collection tray. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 , 3 As shown, the working platform 2 is welded from a steel frame, with an overall height of approximately 2.1m. The platform is equipped with guardrails, a side ladder 3, and an escape slide at the rear for emergency evacuation. A wellhead through-hole is located in the center of the platform. Well control equipment such as blowout preventers and heightening tees 8 are installed sequentially from bottom to top on the wellhead device 9. Adjustable casing 5 is used to adapt to different wellhead heights. The bottom of the platform is fixedly connected to the ground via a bottom crossbeam 7, which can resist the torque and vibration generated during drilling and repair. Limiting structures are installed at the four corners of the platform for docking with the well site foundation, improving stability.

[0039] like Figure 2 , 5 As shown in Figure 6, the hydraulic rotary table 1 is positioned above the wellhead device 9 in the center of the platform. Driven by a hydraulic power source, it achieves two-stage speed output, featuring high torque, good stability, and fast response. The rotary table body consists of a shell, drive motor, transmission gears, slip seats, and a central through hole, used to clamp the drill pipe and provide rotational power. The torque of the hydraulic rotary table 1 can cover the functions of a traditional mechanical rotary table, and can directly replace the screw drill for casing milling, reducing the probability of stuck drill pipe downhole. A gripper 10 is installed above the rotary table, which can fix, clamp, and release the drill pipe, making tripping operations safer and more reliable.

[0040] like Figure 2 , 3 As shown in Figure 4, the wellhead device 9 consists of a wellhead adapter and a sealing connection structure, used to transmit wellhead pressure to the blowout preventer (BOP) assembly 6. The BOP adopts a conventional shear seal structure, which can achieve full sealing, partial sealing, and annular control according to the working conditions. A heightening tee 8 can be installed below the BOP, which serves as the mounting base for the hydraulic rotary table 1 and the clamping device. The BOP is connected to the hydraulic control console via a high-pressure oil pipe, enabling remote switching, pressure regulation, and annular monitoring functions. This well control system can achieve real-time control of wellbore pressure during drilling and workover operations, ensuring construction safety.

[0041] The hydraulic power source adopts an independent modular structure, including a diesel engine, water cooling system, main pump, auxiliary pump, oil tank, and filter unit. The power source supplies pressurized oil to the rotary table, blowout preventer (BOP), and slip holders via oil pipes. Matching-fit connectors are used for pipe connections, and each oil line has limit switches and markings to prevent incorrect connections. The control console is located on the side of the platform. The driller can use the joystick to perform operations such as rotary table start-up, speed adjustment, clamp calibration, BOP activation, and slip locking. The control console has mechanical travel limits to prevent accidental activation and dangerous actions.

[0042] like Figure 3As shown, to prevent wellhead backflow from contaminating the well site, a water collection tray (11) is installed at the bottom of the platform, connected to a guide channel and hoses. The wastewater automatically flows into a wastewater tank or circulating water tank on site. The collection system can operate continuously during wellhead pumping, sand flushing, milling, and cleaning operations, keeping the work area clean and improving the safety of the construction environment.

[0043] When installing this utility model, the location of the ground anchors should be selected first to create favorable working conditions for well workover operations. This should facilitate the placement of well workover equipment and the running-in / run-out tubing, while also considering ease of equipment transport and installation. First, determine the orientation of the low-platform working device. Then, determine the location and number of ground anchors based on the height of the pressurized working device. Finally, determine the type of ground anchor based on the soil conditions of the well site.

[0044] Then, using a specialized horizontal lifting device, the platform assembly is lifted horizontally from the vehicle and placed flat on the surface. The area around the wellhead is tidied, and the low platform assembly is installed vertically using lifting tools. The platform assembly is then raised and leveled, moved above the wellhead, and positioned on a foundation supporting the platform assembly.

[0045] Install the blowout preventer, liquid collection and sludge collection tray (water collection tray 11), ladder, escape slide, and platform railings, etc. The platform device dismantling process is the reverse of the above process.

[0046] Piping connecting the power source and the platform assembly. The input and output oil ports at the bottom of the power skid and the side of the platform assembly are connected via inlet and outlet oil lines, and further connected to the blowout preventer (BOP) system, slewing system, and conical slip system components via branch oil lines. When connecting pipelines, all hoses and connectors must be correctly matched (T, hydraulic turntable 1, T2, P2 grease fittings). The joints must be thoroughly cleaned to prevent contamination. When assembling the joints, check the small sealing ring inside the grease fitting for damage or loss; replace it immediately if damaged.

[0047] The working principle of this utility model:

[0048] The system is based on the coordinated operation of multiple subsystems, including the hydraulic rotary table 1 driving the drill string rotation with output torque, the platform structure providing stable support, the blowout preventer assembly 6 achieving well control sealing, the gripping device controlling the drill string, and the sludge collection system maintaining a clean working environment. Before operation begins, the device is firmly connected to the well site foundation via a ground anchor chassis, forming a stable load-bearing base. The working platform 2 is designed as a low platform, bringing the hydraulic rotary table 1 and the blowout preventer closer to the ground, thereby lowering the overall center of gravity and improving the stability of the equipment during drilling and repair operations. Especially under conditions of drastic changes in torque and axial load, the platform will not sway or shift.

[0049] The blowout preventer assembly 6 installed on the wellhead device 9 forms the core of the well control system. It controls the wellhead pressure in real time through a sealing mechanism. When the well pressure rises, the blowout preventer can perform full or partial sealing operations to prevent well kicks or overflows, improving operational safety. A lift-up tee 8 is installed above the blowout preventer. When the drill string is screwed into the wellhead, it can divert fluid or add auxiliary fittings. A hydraulic rotary table 1 is installed on the upper end of the lift-up tee 8. Its internal hydraulic motor is driven by pressurized oil supplied by a power source. The motor's output torque is transmitted to the rotary table body through a gear set, enabling the drill pipe to rotate. When the drill string encounters falling debris, old packers, or damaged areas inside the casing, the rotary table can output high torque to perform milling, replacing the traditional screw drill and structurally avoiding the stuck drill phenomenon caused by the large contact area of ​​the screw drill.

[0050] The hydraulic rotary table 1 has a through hole in its center, allowing the drill pipe to pass through. Simultaneously, the gripper 10 above it can hold the drill pipe during tripping in and out of the drill string. When the drill string needs to be lifted or suspended, the gripper 10 clamps the drill pipe, thus achieving controlled support. When rotation is required, the gripper 10 releases, and the rotary table takes over the power output to the drill string. Throughout the process, the control console issues commands to the hydraulic system according to construction needs, realizing operations such as rotary table start / stop, speed adjustment, blowout preventer control, and gripping actions. The hydraulic system, as the power core, provides stable oil pressure to each actuator through the main pump and auxiliary pump. The pipeline uses a matching insertion structure to avoid mis-insertion and improve safety.

[0051] During milling, sand flushing, and other operations, waste liquid may be returned from the wellhead. The water collection tray 11 collects the returned liquid and sends it to the circulating water tank through a guide channel, thereby preventing well site contamination. Throughout the operation, the platform's low-height structure allows operators to approach the wellhead more safely. All control logic is centrally managed by the control console, forming a highly integrated workflow for drilling, workover, debris handling, milling, and well control. This enables the platform to handle major overhaul tasks even with minor repairs, improving construction efficiency and significantly reducing energy consumption and risk.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments are only for illustrating the technical concept and characteristics of this utility model, and are intended to enable those skilled in the art to understand and implement the content of this utility model. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A low-platform hydraulic drilling and repair operation device, characterized in that: Includes a working platform (2), a hydraulic turntable (1), and a blowout preventer assembly (6). The working platform (2) is installed on the upper part of the wellhead device (9) by a bracket. A hydraulic turntable (1) is installed on the working platform (2), and the hydraulic turntable (1) is connected to a hydraulic supply device. The hydraulic rotary table (1) clamps and releases the drill pipe through the gripper (10), and the hydraulic rotary table (1) drives the drill pipe through the gripper (10); a blowout preventer assembly (6) is provided below the hydraulic rotary table (1) and between it and the wellhead device (9).

2. The low-platform hydraulic drilling and repair device according to claim 1, characterized in that: It also includes a bottom crossbeam (7), which is installed around the wellhead device (9). The bottom crossbeam (7) is fixed to the ground by ground anchors. At least four columns are provided on the bottom crossbeam (7). An adjusting sleeve (5) is fixedly connected to the bottom of the working platform (2). Multiple pin holes are provided on the adjusting sleeve, which is connected to the columns by pin shafts and adjusts the height of the working platform (2).

3. The low-platform hydraulic drilling and repair device according to claim 1, characterized in that: It also includes a driller's platform, which is installed on the work platform (2) and is equipped with a safety limit baffle and a pressure gauge. The pressure gauge displays the pressure of each pipeline and the oil circuit can be switched by the control lever or button.

4. The low-platform hydraulic drilling and repair device according to claim 1, characterized in that: The work platform (2) is surrounded by guardrails, and ladders (3) and safety slides (4) are installed on both sides.

5. The low-platform hydraulic drilling and repair device according to claim 1, characterized in that: The gripper (10) is one of the following: hydraulic tapered slip, pneumatic slip, or square drill pipe filler.

6. The low-platform hydraulic drilling and repair device according to claim 5, characterized in that: The hydraulic supply device is a power room or hydraulic station, and the hydraulic supply device drives the turntable, conical slips and blowout preventer through the inlet and return oil pipelines respectively.

7. The low-platform hydraulic drilling and repair device according to claim 1, characterized in that: It also includes drill pipe conveyors, which provide drill pipes for drilling and repair operations.

8. The low-platform hydraulic drilling and repair device according to claim 1, characterized in that: It also includes a water collection pan (11), which is located between the hydraulic turntable (1) and the blowout preventer assembly (6) and is used for sewage discharge through a pipeline. The water collection pan (11) is connected to the segmented overflow trough and the circulation tank.

9. A low-platform hydraulic drilling and repair device according to claim 1, characterized in that: It also includes a heightening tee (8) and a mud umbrella, wherein the heightening tee (8) and the mud umbrella are installed between the wellhead device (9) and the blowout preventer assembly (6).

10. A low-platform hydraulic drilling and repair device according to claim 1, characterized in that: The hydraulic turntable (1) includes a hydraulic motor and a hydraulic brake mounted on the base. The hydraulic motor drives the intermediate rotating structure where the gripper (10) is located through gear meshing. The intermediate rotating structure is connected to the base of the hydraulic turntable (1) through bearings.

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