Combined type inner pipe suitable for middle-deep layer geothermal well
By combining PE pipes and PE-RTI I pipes in a modular inner pipe design, the stability and cost issues of the inner pipes in medium-deep geothermal wells under high-temperature conditions are solved, resulting in an economical and efficient inner pipe system.
Patent Information
- Application Number
- CN202520082000.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-01-14
AI Technical Summary
The selection of materials for the inner pipes of existing medium-deep geothermal wells is limited under high-temperature conditions, resulting in high costs or unstable performance, and safety hazards such as rupture.
The system employs a combined inner pipe design, with PE pipes used in low-temperature areas and PE-RTI I pipes used in high-temperature areas. The pipes are connected via flange sleeves and bolts, and the combined sleeve mechanism enhances stability and economy.
It reduces material costs, improves the stability and service life of the inner tube under high temperature conditions, and avoids problems such as pipe rupture caused by materials not being adapted to high temperature environments.
Smart Images
Figure CN223634647U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to geothermal well pipe technical field, concretely is a combined inner tube suitable for middle deep geothermal well. BACKGROUND
[0002] At present, during the development and utilization of middle deep geothermal well, coaxial casing pipe technology is widely used. This casing pipe system is usually composed of outer pipe and inner tube, wherein the outer pipe is mostly seamless steel pipe, which is used to provide structural support and protection. The inner tube, on the other hand, undertakes the important task of transporting geothermal fluid, and the selection of its material is directly related to the operating efficiency and safety of the geothermal well.
[0003] In the selection of inner tube material, there are currently two main types: PE pipe and PE-RT III pipe. PE pipe has the advantages of lower cost and easy processing, and performs well in low temperature environments (temperature below 40℃). However, when the bottom temperature of the geothermal well rises to about 90℃, the material structure and physical properties of the PE pipe will change, leading to a shorter service life of the pipe and even possible rupture, thereby causing safety hazards.
[0004] In contrast, PE-RT III pipe has higher high-temperature resistance (service temperature up to 110℃), which can meet the long-term use requirements of middle deep geothermal wells under high temperature conditions. However, the material price of PE-RT III pipe is relatively high, which directly leads to an increase in the investment cost of geothermal wells.
[0005] Therefore, the technical personnel in the art propose a combined inner tube suitable for middle deep geothermal wells to solve the problems raised in the background technology. SUMMARY
[0006] To solve the above technical problems, the utility model provides a combined inner tube suitable for middle deep geothermal wells, which selects materials according to the actual temperature distribution of the geothermal well, ensuring the stability and durability of the inner tube under high temperature conditions. It avoids problems such as pipe rupture and aging caused by the inadaptability of materials to high temperature environments.
[0007] A combined inner tube suitable for middle deep geothermal wells, comprising a PE pipe, the bottom end of the PE pipe is provided with an upper flange sleeve, the bottom of the PE pipe is provided with an upper flange sleeve, the bottom of the upper flange sleeve is provided with a lower flange sleeve, the lower flange sleeve and the upper flange sleeve are connected together through bolts, and the bottom end of the lower flange sleeve is fixedly connected with a PE-RT III pipe.
[0008] The sleeve mechanism is arranged on the outer side of the upper flange sleeve and the lower flange sleeve.
[0009] Preferably, the sleeving mechanism comprises an upper flange body and a lower flange body, the upper flange body and the lower flange body are sleeved outside the upper flange sleeve and the lower flange sleeve, the inner sides of the lower flange body and the upper flange body are threadedly connected together through a plurality of connecting bolts, and a plurality of water pipes are further arranged on the outer sides of the upper flange body and the lower flange body.
[0010] Preferably, the water pipes are evenly arranged on the inner sides of the lower flange body and the upper flange body and used for passing water.
[0011] Compared with the prior art, the utility model has the advantages of the following beneficial effects:
[0012] 1. By adopting the combined design, different materials can be selected to manufacture different parts of the inner pipe. For the area with lower temperature, the PE pipe with lower cost can be selected; for the well bottom area with higher temperature, the PE-RT II pipe or other high-temperature resistant materials can be selected. The design effectively reduces the overall material cost and improves the economy. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a schematic diagram of the three-dimensional structure of the utility model;
[0014] Figure 2 is a schematic diagram of the sectional structure of the utility model. Figure 1
[0015] In the figure: 1, PE pipe; 2, upper flange sleeve; 3, upper flange body; 4, lower flange body; 5, lower flange sleeve; 6, PE-RT II pipe; 7, connecting bolt; 8, water pipe. DETAILED DESCRIPTION
[0016] The embodiments of the utility model will be further described in detail in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.
[0017] As shown in the accompanying Figure 1 to the accompanying Figure 2 :
[0018] Example 1: according to Figure 1 - Figure 2 The utility model provides a combined inner tube suitable for middle -deep layer geothermal well, including PE pipe 1, the bottom of PE pipe 1 is provided with upper flange sheath 2, the bottom of PE pipe 1 is provided with upper flange sheath 2, the bottom of upper flange sheath 2 is provided with lower flange sheath 5, lower flange sheath 5 and upper flange sheath 2 are connected together through bolt, the bottom of lower flange sheath 5 is fixedly connected with PE-RT II pipe 6, by adopting combined design, can flexibly select different materials to make the different parts of inner tube. For the area of lower temperature, can select the PE pipe 1 of lower cost, for the well bottom area of higher temperature, then adopt the PE-RT II pipe 6 of high temperature resistance or other high temperature resistant materials. This design effectively reduces the overall material cost, improves the economy.
[0019] The sleeve mechanism is arranged outside the upper flange sheath 2 and the lower flange sheath 5, and the sleeve mechanism comprises the upper flange body 3 and the lower flange body 4. The upper flange body 3 and the lower flange body 4 are arranged outside the upper flange sheath 2 and the lower flange sheath 5. The inner sides of the lower flange body 4 and the upper flange body 3 are threadedly connected by a plurality of connecting bolts 7. A plurality of water pipes 8 are arranged outside the lower flange body 4 and the upper flange body 3. The water pipes 8 are evenly arranged inside the lower flange body 4 and the upper flange body 3, and are used for passing water. The arrangement of the water pipes 8 allows water to flow through and functions as a centralizer, so that the inner tube can be kept in the center of the outer tube.
[0020] The upper flange body 3 and the lower flange body 4 are connected together by the upper flange body 3 and the lower flange body 4 between the PE pipe 1 and the PE-RT II pipe 6 during use. The different materials can be conveniently arranged in geothermal wells with different temperatures. In addition to the bolt holes for fixation, the water pipes 8 are arranged outside the upper flange body 3 and the lower flange body 4. The water pipes not only facilitate water flow, but also function as a centralizer, so that the inner tube can be kept in the center of the outer tube, preventing the inner tube from deviating or vibrating due to water erosion or temperature changes.
[0021] The standard parts used in the utility model can be purchased from the market. The special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the existing technology. The mechanical parts and equipment adopt conventional models in the existing technology. The circuit connection adopts the conventional connection mode in the existing technology, which will not be described in detail. The contents not described in detail in the specification belong to the existing technology known to the professional technicians in the field.
[0022] In the description of the utility model, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. The meaning of "multiple" is two or more, unless otherwise specifically limited.
[0023] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0024] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0025] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without conflict
[0026] The utility model discloses the embodiment in the drawing, only relate to the structure involved in the embodiment of the disclosure, other structures can refer to the usual design, under the condition of no conflict, the same embodiment and different embodiments of the utility model can be combined mutually.
[0027] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A combined inner tube suitable for use in a medium-deep geothermal well, characterized in that: The utility model provides a kind of PE pipe (1), the bottom end of the PE pipe (1) is provided with upper flange sleeve (2), the bottom of the PE pipe (1) is provided with upper flange sleeve (2), the bottom of the upper flange sleeve (2) is provided with lower flange sleeve (5), the lower flange sleeve (5) is connected together with upper flange sleeve (2) by bolt, the bottom end of the lower flange sleeve (5) is fixedly connected with PE-RTI I pipe (6); It also includes a sleeving mechanism, which is arranged outside the upper flange sleeve (2) and the lower flange sleeve (5).
2. The combined inner pipe suitable for use in a medium-deep geothermal well according to claim 1, characterized in that: The sleeving mechanism includes an upper flange body (3) and a lower flange body (4), both of which are sleeved outside the upper flange sleeve (2) and the lower flange sleeve (5). The inner sides of the lower flange body (4) and the upper flange body (3) are threadedly connected together by a plurality of connecting bolts (7). The outer sides of the upper flange body (3) and the lower flange body (4) are also provided with a plurality of water pipes (8).
3. The combined inner pipe suitable for use in a medium-deep geothermal well according to claim 2, characterized in that: The water pipes (8) are evenly arranged on the inner sides of the lower flange body (4) and the upper flange body (3) for water flow.