A deepwater wellbore damage repair device

Abstract

The utility model relates to water conservancy project and underground repair equipment technical field discloses a kind of deep water well wall damage repair devices, including deep water well, further including lifting equipment, tow rope one, tow rope two, material pipe, cone plug, repair casing and flexible plugging;The cone plug is fixed to the top end of repair casing, and after plugging repair casing top pipe mouth, material pipe is placed on the upside of cone plug, material pipe and cone plug are connected to the same lifting equipment by tow rope one and tow rope two respectively, and lifting equipment is erected and fixed above deep water well, and flexible plugging is fixed at the bottom end of repair casing.Compared with prior art, the advantages are that: the construction process of the utility model does not need to drain well water, reduces the drainage cost and time, and adapts to high water level well condition;The repair process of the utility model is directly carried out underwater, reducing the interference and damage to the well structure;The utility model realizes the controllable separation of cone plug by tow rope, improves the safety and reliability of construction.

Description

Technical Field

[0001] This utility model relates to the technical field of water conservancy engineering and downhole repair equipment, specifically to a deep water well wall damage repair device. Background Technology

[0002] During use, deep wells may experience damage or cracks in their walls due to geological changes, water erosion, or external impacts, leading to problems such as increased sand content in the well water, decreased water flow, or even well wall collapse. Currently, repairs to deep well walls mostly involve stopping the pump, draining the water, and then performing manual or mechanical repairs. This approach has drawbacks such as long construction periods, high costs, significant impact on the well structure, and difficulty in implementation under high water levels or complex geological conditions.

[0003] Therefore, there is an urgent need for a deep-water well wall repair device that can be implemented directly underwater, does not require draining the well water, and is simple and reliable to operate. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide a deep water well wall damage repair device to overcome the problems of long construction cycle, high cost and poor adaptability of existing repair methods.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A deep well wall damage repair device includes a deep well, a hoisting device, a first traction rope, a second traction rope, a material pipe, a cone plug, a repair casing, and a flexible sealing material. The cone plug is fixed to the top of the repair casing and seals the top opening of the repair casing. The material pipe is placed on the upper side of the cone plug. The material pipe and the cone plug are connected to the same hoisting device via the first traction rope and the second traction rope, respectively. The hoisting device is erected and fixed above the deep well. A flexible sealing material is fixed to the bottom of the repair casing. After the repair casing is lowered into the deep well, it covers the damaged area of ​​the well wall. Cement mortar filled into the material pipe is finally filled into the gap between the repair casing and the deep well. After the cement mortar solidifies, the cone plug is separated from the repair casing and removed.

[0007] As an improvement, the cone plug and the repair sleeve are connected together by a towing rope.

[0008] As an improvement, the lifting device is fixed above the deep well by a lifting bracket.

[0009] The advantages of this utility model compared with the prior art are as follows:

[0010] 1. This new construction method eliminates the need to drain well water during construction, reducing drainage costs and time, and is suitable for wells with high water levels.

[0011] 2. This new repair process is carried out directly underwater, reducing interference and damage to the well structure;

[0012] 3. This new type of device achieves controllable separation of the cone plug through the connecting rope, which improves the safety and reliability of construction.

[0013] 4. This new type of flexible sealing material can effectively prevent cement mortar from flowing out from the bottom in the initial stage of grouting, ensuring a dense filling;

[0014] 5. This new type of repair casing can be pre-customized according to the well diameter, has good fit, and strong overall integrity after repair. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a partially enlarged view of this utility model.

[0017] As shown in the figure: 1. Deep water well; 2. Hoisting equipment; 3. Traction rope one; 4. Traction rope two; 5. Material pipe; 6. Cone plug; 7. Repair casing; 8. Flexible sealing material; 9. Damaged well wall; 10. Connecting rope; 11. Hoisting support. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] like Figure 1 and 2 As shown, this embodiment provides a deep water well wall damage repair device, including a deep water well 1, a lifting device 2, a first traction rope 3, a second traction rope 4, a material pipe 5, a cone plug 6, a repair sleeve 7, a flexible sealing material 8, a connecting rope 10, and a lifting support 11.

[0021] In practice, the following steps can be followed:

[0022] Step 1: Ground Assembly

[0023] A flexible plug 8, approximately 200mm high, is tied to the bottom of the repair casing 7 on the ground. The flexible plug 8 can be made of rubber, polymer composite materials, or woven fabric, possessing a certain degree of elasticity and waterproofing. It is used to temporarily seal the gap between the bottom of the repair casing and the well wall during the initial grouting stage, preventing cement mortar loss. The repair casing 7 is made of steel, with a wall thickness designed according to well depth and pressure, possessing sufficient rigidity, corrosion resistance, and load-bearing capacity. The cone plug 6 is made of iron, its shape matching the inner wall of the top of the repair casing 7, and can achieve temporary sealing through threads, snaps, or friction. The cone plug 6 and the repair casing 7 are connected by a traction rope 10, which can be made of nylon rope, steel wire rope, or breakable engineering plastic rope. Its breaking strength must be designed to be greater than the cement mortar grouting resistance but less than the maximum lifting force of the hoisting equipment to ensure it can be broken. The feed pipe 5 is placed above the cone plug 6 and connected to the hoisting equipment 2 via traction rope 1 3; the cone plug 6 is connected to the same hoisting equipment 2 via traction rope 2 4. The lifting equipment 2 can be a winch, hydraulic hoist or engineering crane, and is fixed above the wellhead of the deep well 1 by the lifting support 11. The lifting support 11 can be a steel structure derrick or a movable tripod to ensure stability and reliability.

[0024] Step 2: Lowering and Positioning

[0025] By simultaneously lowering traction ropes 3 and 4 using lifting equipment 2, the material pipe 5, cone plug 6, repair casing 7, and flexible sealing material 8 are lowered into the well as a whole. During the lowering process, the position of the repair casing 7 can be monitored through wellhead observation or underwater cameras until the repair casing 7 covers approximately 30-50 meters above the damaged area 9 of the well wall. At this point, the flexible sealing material 8 contacts the well wall and creates a preliminary seal.

[0026] Step 3: Grouting

[0027] Pre-mixed cement mortar is injected into the feed pipe 5. The mortar should have good fluidity, anti-dispersion properties, and early strength. Then, the lifting device 2 is slowly raised, causing the feed pipe 5 and the cone plug 6 to move upwards synchronously. Under its own weight, the cement mortar in the feed pipe 5 flows through the gap between the cone plug 6 and the top of the repair casing 7 into the annular gap between the repair casing 7 and the well wall. During the grouting process, the repair casing can be slightly moved up and down to facilitate mortar flow and air venting. Grouting is stopped when the mortar overflows from the top of the repair casing or when the preset grouting volume is reached.

[0028] Step 4: Allow to solidify

[0029] Leave it in this state for approximately 48 hours to allow the cement mortar to fully harden and form a unified structure with the well wall and repair casing. During this period, maintain slight tension on the hoisting equipment to prevent displacement.

[0030] Step 5: Separation and Evacuation

[0031] After the cement mortar solidifies, the lifting equipment 2 simultaneously lifts the cone plug 6 and the material pipe 5 upwards. During the lifting process, the traction rope 10 is subjected to tension. When the tension exceeds its design breaking strength, the traction rope 10 breaks, and the cone plug 6 separates from the repair sleeve 7. The cone plug 6 and the material pipe 5 continue to be lifted above the water surface, cleaned, and reused. The repair sleeve 7 is then permanently fixed at the damaged location on the well wall, completing the repair operation.

[0032] Other implementation methods

[0033] In another embodiment, the flexible plug 8 can be made of a biodegradable material, which will degrade on its own within a period of time after the repair is completed, avoiding long-term effects on the wellbore. The traction rope 10 can also be replaced by an electromagnetic release or mechanical unhooking mechanism to achieve more precise separation control. For large-diameter or deep well repairs, the repair casing 7 can adopt a segmented structure, which can be assembled on-site and then lowered.

[0034] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A deep water well wall damage repair device, comprising a deep water well (1), characterized in that: It also includes a lifting device (2), a first traction rope (3), a second traction rope (4), a material pipe (5), a cone plug (6), a repair sleeve (7), and a flexible sealing material (8); the cone plug (6) is fixed to the top of the repair sleeve (7) and seals the top opening of the repair sleeve (7), the material pipe (5) is placed on the upper side of the cone plug (6), and the material pipe (5) and the cone plug (6) are respectively connected to the same lifting device (2) through the first traction rope (3) and the second traction rope (4). On the surface, the lifting equipment (2) is erected and fixed above the deep water well (1), and a flexible plug (8) is fixed at the bottom of the repair casing (7). After the repair casing (7) is lowered into the deep water well (1), it covers the damaged part (9) of the well wall on the deep water well (1). The cement mortar filled into the material pipe (5) is finally filled into the gap between the repair casing (7) and the deep water well (1). After the cement mortar solidifies, the cone plug (6) is separated from the repair casing (7) and removed.

2. The deep well wall damage repair device according to claim 1, characterized in that: The repair sleeve (7) is a steel structure.

3. The deep well wall damage repair device according to claim 1, characterized in that: The cone plug (6) is an iron structure.

4. The deep well wall damage repair device according to claim 1, characterized in that: The cone plug (6) and the repair sleeve (7) are connected together by a towing rope (10).

5. The deep well wall damage repair device according to claim 1, characterized in that: The lifting device (2) is erected and fixed above the deep well (1) by a lifting bracket (11).

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