Automatic rebound flexible integrated environment-friendly cofferdam

Abstract

The utility model relates to an automatic-rebounding flexible integrated environment-friendly cofferdam, and belongs to the technical field of environment protection of clean production of oil field sewage and dirty oil collecting and discharging facilities. The cofferdam bottom plate and the cofferdam fences are made of polyurethane cloth, and polyurethane polystyrene foam is filled in the cofferdam bottom plate and the cofferdam fences; when the fence is used, if collapse is generated due to long-term rolling of a construction vehicle, the polyurethane polystyrene foam can be reinjected, so that the fence can be recovered to a normal size for continuous use. Damage caused by rolling of a construction vehicle is reduced, the labor intensity of transportation and manual laying is reduced, and pollution caused by the fact that the cofferdam needs to be disassembled is avoided. And the cofferdam is light in weight and simple and convenient to mount, dismount, collect and move, and the characteristic of repeated use of the cofferdam is really achieved. The problems that when used, an existing inflatable cofferdam is easily punctured and damaged by sharp objects to cause air leakage and needs to be frequently repaired or inflated in an oil field construction site, and the four corners of the cofferdam are made of glass fiber reinforced plastic materials and are easily rolled and broken by construction vehicles to cause damage to a fence are thoroughly solved.

Description

Technical Field

[0001] This utility model relates to an automatic rebound flexible integrated environmental protection cofferdam, belonging to the field of clean production and environmental protection technology for oilfield sewage and oily waste collection and discharge facilities. Background Technology

[0002] With increasingly stringent national environmental protection requirements and standards for the treatment of wastewater, waste gas, and solid waste, strict regulations have been imposed on oilfield drilling and production operations. After well workovers, well cleaning, and other well operations, oil pipes and other downhole equipment covered in oil and wastewater must be treated to prevent environmental pollution. Previously, two methods were generally used to collect wastewater and oil from oil pipes and other downhole equipment: one was to directly cover the well site with plastic film and fencing; the other was to construct multiple steel square channels to form a boat-shaped device. While these methods have prevented the indiscriminate flow of oil and wastewater to some extent, they have the following drawbacks: the plastic film and fencing method can only be used once, and the accumulation of discarded plastic film can cause secondary environmental pollution; furthermore, the subsequent treatment costs can easily reach several million yuan. While the ship-shaped device, composed of multiple steel square channels, can be reused, on-site installation and assembly are labor-intensive and time-consuming. Relocation requires the use of cranes and towing equipment, resulting in high relocation costs. Furthermore, steel square channels are susceptible to corrosion from acids, alkalis, and salts at oilfield construction sites, leading to a shorter service life. They are also prone to rusting and deformation, making it difficult to achieve a tight fit between the individual units during assembly. This inevitably results in oil and wastewater flowing onto the construction site, causing environmental pollution. Additionally, the steel square channel device requires at least two anti-corrosion and rust-proofing treatments annually, leading to high maintenance costs.

[0003] To address the aforementioned issues, an applicant has designed an inflatable cofferdam device, patent publication number "CN209855336 U". This inflatable cofferdam features an anti-slip mat installed on the base of a flexible platform, upon which a support pad is laid. An oil pipe support frame is placed on the support pad. This inflatable cofferdam offers excellent load-bearing capacity, is lightweight, ensures stable and reliable operation of the flexible platform, allows for repeated inflation and reuse without requiring anti-corrosion or rust prevention treatment, and has a long service life. The anti-slip mat is easy to remove and fold, occupies little space, and is convenient for installation and relocation, completely preventing leakage of oil and wastewater. It effectively solves the problems of secondary pollution caused by the single-use of plastic film and fencing, and the high labor and time costs associated with the installation and assembly of steel square trough-shaped devices, their susceptibility to acid, alkali, and salt corrosion, short lifespan, susceptibility to rust and deformation, difficulty in achieving a tight fit leading to leakage and environmental pollution, and high maintenance costs.

[0004] However, the above-mentioned cofferdam devices have also exposed some problems in actual use. First, the inflatable cofferdam is made of polyurethane membrane gas columns welded together. In the rough working environment of the oilfield, the gas columns are easily punctured and damaged by sharp objects, causing air leakage. It is necessary to frequently go to the oilfield construction site for repair or inflation, resulting in high daily operation and maintenance costs and making it unsuitable for the working conditions of the oilfield. At the same time, after the gas columns leak, they collapse, and sewage and oily waste inside the cofferdam leak out, causing environmental pollution. Second, the plastic membrane + cofferdam is made of fiberglass material and is a rigid cofferdam. When construction vehicles run over the cofferdam, it is easily crushed and damaged. The labor intensity of manual installation, dismantling and transportation is high, which increases the cost of use. During the relocation and dismantling, sewage and oily waste inevitably leak from the joints, causing environmental pollution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the aforementioned cofferdam technology by providing a flexible, self-rebounding, flexible, integrated, and environmentally friendly cofferdam made of polyurethane fabric and filled with polyurethane foam. This cofferdam effectively reduces damage caused by construction vehicles, lowers the labor intensity and costs associated with transportation, loading, unloading, and manual installation. In the event of collapse during use, the cofferdam can be restored to its normal size and maintain its resilience by reinjecting polyurethane foam. Furthermore, it is lightweight, easy to install, dismantle, and move, and can truly be reused.

[0006] This utility model achieves the above objectives through the following technical solution:

[0007] An automatic rebound flexible integrated environmental protection cofferdam includes a cofferdam base plate, a cofferdam enclosure, and polyurethane foam. The cofferdam enclosure is placed on the cofferdam base plate. The cofferdam enclosure is characterized in that it is composed of straight enclosures and corner enclosures connected together. The cross-sections of the straight enclosures and corner enclosures are trapezoidal structures, and the straight enclosures and corner enclosures are filled with polyurethane foam.

[0008] The bottom plate of the cofferdam is evenly covered with eyelets around the outer edge of the cofferdam enclosure.

[0009] The top or side surfaces of the straight and corner enclosures of the cofferdam are provided with injection holes, which are 3-5 mm round holes. After the injection and foaming are completed, polyurethane cloth is used for hot-melt welding to form a seal.

[0010] The bottom slab and the outer layer of the cofferdam enclosure are made of polyurethane fabric.

[0011] The polyurethane foam is a flexible polyurethane foam, which is composed of polyether polyol, silicone oil, catalyst and water in a ratio of 1:1:1:1.

[0012] The eyelet buckle is 20-30cm away from the outer edge of the bottom plate of the cofferdam; the interval between two eyelets is 0.6-1m.

[0013] The outer edge of the cofferdam enclosure is 30-50cm away from the outer edge of the cofferdam bottom plate.

[0014] The trapezoidal structure dimensions of the straight and corner enclosures of the cofferdam are 80mm at the top, 160mm at the bottom, and 200mm in height.

[0015] The bottom plate of the cofferdam and the cofferdam enclosure, as well as the straight enclosure and the corner enclosure, are all connected by hot-melt welding.

[0016] The advantages of this utility model compared with the prior art are as follows:

[0017] This automatic rebound flexible integrated environmentally friendly cofferdam is constructed by connecting the cofferdam base plate and the cofferdam enclosure made of polyurethane fabric through hot-melt welding, and then filling the interior with polyurethane foam. It rebounds after being driven over by construction vehicles, and any insufficient rebound can be injected with foam to restore its original shape. This reduces the labor intensity and costs associated with transportation, loading, unloading, and manual installation, and avoids environmental pollution caused by the need to dismantle the cofferdam. This automatic rebound flexible integrated environmentally friendly cofferdam is lightweight, easy to install, dismantle, and move, and can truly be reused. It completely solves the problems of existing inflatable cofferdams, such as easy puncture and damage by sharp objects leading to air leakage, requiring frequent on-site repairs or refills, resulting in high daily operation and maintenance costs and unsuitability for oilfield conditions; rigid cofferdams made of plastic film and fiberglass are easily broken by construction vehicles, causing damage and pollution from sewage and oil spills after collapse; and the high labor intensity of manual installation, dismantling, and transportation increases operating costs. Attached Figure Description

[0018] Figure 1 A schematic diagram of the main structure of an automatically rebounding, flexible, integrated environmentally friendly cofferdam.

[0019] Figure 2 A top-view structural diagram of an automatically rebounding, flexible, integrated environmentally friendly cofferdam;

[0020] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0021] Figure 4 This is a magnified view of a portion of point B.

[0022] In the diagram: 1. Cofferdam bottom plate, 101. Eyelet, 2. Cofferdam enclosure, 201. Straight enclosure, 202. Corner enclosure, 203. Enclosure surface, 204. Injection hole, 3. Polyurethane foam. Detailed Implementation

[0023] The following is a more detailed description of the specific implementation method of the automatic rebound flexible integrated environmental protection cofferdam, with reference to the accompanying drawings:

[0024] The design concept of this automatic rebound flexible integrated environmentally friendly cofferdam is based on the requirement that various downhole processes in oilfields must prevent environmental pollution from wastewater and oil. For example, the spillage and loss of chemical additives occur during various processes such as running tubing or rods, steam cleaning of tubing or rods at well completion sites, well washing, acidizing, unblocking, and fracturing. After the tubing is removed from the well, it carries oil and wastewater, and in accordance with national environmental protection regulations, these tubing sections must first be cleaned. Existing inflatable cofferdam devices used for cleaning downhole pipes and other equipment have several problems in practical use. Firstly, the inflatable cofferdam's enclosure is made of polyurethane membrane, welded together using hot-melt welding. This makes it susceptible to punctures and leaks from sharp objects, requiring frequent on-site repairs and refilling. Secondly, rigid enclosures made of fiberglass are easily crushed by construction vehicles, leading to collapses and the leakage of wastewater and oil, causing environmental pollution. Thirdly, the manual installation, dismantling, and transportation processes are labor-intensive, severely limiting the cofferdam's application. After numerous trials and in-depth on-site investigations, the applicant has selected a cofferdam base and enclosure surface made of polyurethane fabric, connected by hot-melt welding, and then filled with polyurethane foam to create an automatically resilient, flexible, integrated, environmentally friendly cofferdam. This effectively solves the aforementioned problems of existing inflatable cofferdam devices and other types of cofferdams.

[0025] This automatic rebound flexible integrated environmentally friendly cofferdam includes a cofferdam base plate 1, a cofferdam enclosure 2, and polyurethane foam 3. The cofferdam enclosure 2 is placed on the cofferdam base plate 1. The cofferdam enclosure 2 is composed of a straight enclosure 201 and a corner enclosure 202 connected together. The cross-section of the straight enclosure 201 and the corner enclosure 202 is a trapezoidal structure with upper base 80mm, lower base 160mm, and height 200mm. The straight enclosure 201 and the corner enclosure 202 are filled with polyurethane foam 3. The polyurethane foam 3 is a flexible polyurethane foam, and its components are polyether polyol, silicone oil, catalyst, and water, prepared in a ratio of 1:1:1:1.

[0026] Furthermore, eyelets 101 are evenly distributed around the outer edge of the cofferdam base plate 1 near the cofferdam enclosure 2. The cofferdam base plate 1 is fixed to the ground by the eyelets 101 to prevent it from being blown away by the wind. The eyelets 101 are 25cm away from the outer edge of the cofferdam base plate 1. The interval between two eyelets 101 is 0.8m.

[0027] Furthermore, the top or side surfaces of the straight enclosure 201 and corner enclosure 202 of the cofferdam 2 are provided with glue injection holes 204. The glue injection holes 204 are 3-5 mm round holes. After the glue is injected and foamed, polyurethane cloth is used for hot-melt welding to form a seal. For ease of glue injection, it is preferred to make the glue injection holes 204 on the top surface of the straight enclosure 201 and corner enclosure 202.

[0028] Furthermore, the surface layer of the cofferdam base plate 1 and the cofferdam enclosure 2 is made of polyurethane fabric; the outer edge of the cofferdam enclosure 2 is 40cm away from the outer edge of the cofferdam base plate 1.

[0029] Furthermore, the bottom plate 1 of the cofferdam and the cofferdam enclosure 2, as well as the straight enclosure 201 and the corner enclosure 202, are all welded together by hot-melt welding.

[0030] The manufacturing process and technology of this automatic rebound flexible integrated environmental protection cofferdam are as follows:

[0031] First, within the production workshop, polyurethane fabric (TPU membrane) of various sizes is fabricated according to the environmental protection requirements of the oilfield construction site. A certain width of polyurethane fabric is then heat-melted and welded into a complete cofferdam base plate 1, ensuring its overall seepage prevention performance during the heat-melting process. Holes are then drilled every 0.6-1m, 20-30cm from the edge of the entire cofferdam base plate 1, and eyelets 101 are installed to facilitate placement, handling, and securing at the oilfield construction site.

[0032] Then, a rectangular or square hollow cofferdam barrier 2, consisting of straight barriers 201 and corner barriers 202, is hot-melted welded around the entire cofferdam base plate 1 at a distance of 30-50cm from the edge. The cross-section of the cofferdam barrier 2 is trapezoidal, with dimensions of 80mm at the top, 160mm at the bottom, and 200mm in height. One or more injection holes 204 are made on the top surface of each straight barrier 201 and corner barrier 202. Polyurethane foam 3 is injected through the injection holes 204. The polyurethane foam 3 expands and fills the cofferdam barrier 2 within 3-5 minutes, thus completing the automatic rebound flexible integrated environmental protection cofferdam.

[0033] The on-site installation and transportation process for this automatic rebound flexible integrated environmental protection cofferdam is as follows:

[0034] The customized automatic rebound flexible integrated environmental protection cofferdam, designed for the environmental protection zones of the oilfield construction site, is folded, bundled using an automatic packaging and strapping machine, and then hoisted or transported onto production transport vehicles for transport to the oilfield construction site. Upon arrival, workers roughly clean the site, removing obvious stones, wires, and other sharp debris. Then, within the environmental protection zone, workers unpack the automatic rebound flexible integrated environmental protection cofferdam according to the dimensions of the production area. The cofferdam automatically unfolds, and the edges are then stretched and leveled to complete the installation. After use, the automatic rebound flexible integrated environmental protection cofferdam is folded again and bundled by the automatic packaging and strapping machine before being transported back to the production transport vehicle, significantly reducing the labor intensity of workers during installation, dismantling, and transportation. Made of high-polymer foam material, the automatic rebound flexible integrated environmental protection cofferdam is lightweight and has good resilience, reducing the load on vehicles during transportation and facilitating handling and transport.

[0035] The automatically rebounding flexible integrated environmental protection dike collects oily and wastewater, which is then pumped out and recycled using a small electric sewage suction pump.

[0036] The above description is merely a preferred embodiment of the present utility model. The above examples do not limit the substantive content of the present utility model in any way. Any simple modifications or variations made by those skilled in the art to the above specific embodiments based on the technical essence of the present utility model after reading this specification, as well as equivalent embodiments that may be changed or modified using the disclosed technical content, shall still fall within the scope of the technical solution of the present utility model and shall not depart from the essence and scope of the present utility model.

Claims

1. An automatic rebound flexible integrated environmentally friendly cofferdam, comprising a cofferdam base plate (1), a cofferdam enclosure (2), and polyurethane foam (3), wherein the cofferdam enclosure (2) is placed on the cofferdam base plate (1), characterized in that: The cofferdam enclosure (2) is formed by connecting a straight enclosure (201) and a corner enclosure (202). The cross-sections of the straight enclosure (201) and the corner enclosure (202) are trapezoidal structures, and the straight enclosure (201) and the corner enclosure (202) are filled with polyurethane foam (3).

2. The automatic rebound flexible integrated environmental protection cofferdam according to claim 1, characterized in that: The bottom plate (1) of the cofferdam is evenly covered with eyelets (101) around the outer edge of the cofferdam enclosure (2).

3. The automatic rebound flexible integrated environmental protection cofferdam according to claim 1, characterized in that: The top or side surfaces of the straight enclosure (201) and corner enclosure (202) of the cofferdam enclosure (2) are provided with glue injection holes (204). The glue injection holes (204) are 3-5 mm round holes. After the glue injection and foaming are completed, polyurethane cloth is used for hot-melt welding to form a seal.

4. The automatic rebound flexible integrated environmental protection cofferdam according to claim 1, characterized in that: The surface layer of the cofferdam bottom plate (1) and the cofferdam enclosure (2) is made of polyurethane fabric.

5. The automatic rebound flexible integrated environmental protection cofferdam according to claim 2, characterized in that: The eyelet buckle (101) is 20-30cm away from the outer edge of the bottom plate (1) of the cofferdam; the two eyelet buckles (101) are spaced 0.6-1m apart.

6. The automatic rebound flexible integrated environmental protection cofferdam according to claim 1, characterized in that: The outer edge of the cofferdam enclosure (2) is 30-50cm away from the outer edge of the cofferdam bottom plate (1).

7. The automatic rebound flexible integrated environmental protection cofferdam according to claim 1, characterized in that: The trapezoidal structure dimensions of the straight enclosure (201) and corner enclosure (202) of the cofferdam enclosure (2) are 80mm at the top, 160mm at the bottom, and 200mm in height.

8. The automatic rebound flexible integrated environmental protection cofferdam according to claim 1, characterized in that: The bottom plate (1) of the cofferdam and the cofferdam enclosure (2), as well as the straight enclosure (201) and the corner enclosure (202), are all connected by hot-melt welding.

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