In-situ thermal injection well
By setting up multi-layer modules and guide rail slider structure in the injection column, the problem of insufficient supply of agents in the deep and middle layers of soil remediation is solved, realizing precise layered injection of agents and improving the stability of remediation effect.
Patent Information
- Application Number
- CN202522516221.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-11-27
AI Technical Summary
During soil remediation, chemicals tend to diffuse along the path of least resistance, leading to insufficient supply of chemicals in the deep and middle layers, resulting in a hierarchical imbalance of over-remediation in the shallow layer and under-remediation in the deep layer.
An in-situ thermal injection well is designed by setting a shallow final pressure regulating module, a middle layer pressure triggering module, and a deep layer priority start module in the injection string. The orderly injection is constructed by utilizing the difference in spring stiffness, combined with the guide rail slider guidance, to ensure the accuracy and stability of the repair of each layer.
It achieves precise layered injection of the agent, optimizes the repair effect of deep and middle layers, improves the stability and durability of the repair, and adapts to the needs of multiple contaminated layers.
Smart Images
Figure CN223733517U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of in-situ thermal injection well technology, specifically to an in-situ thermal injection well. Background Technology
[0002] Chemical soil remediation technology is widely used in the treatment of moderately and lightly polluted soils due to its wide applicability and relatively convenient operation. This technology is often implemented through in-situ injection, which involves planning and deploying injection wells in the polluted area, and then using the pressure or gravity applied by the pump to deliver the remediation agent, which is formulated according to the type of pollution, to the soil contamination layer through the injection tubing. This allows the agent to come into full contact with the pollutants, and then treats the pollutants in the soil through chemical reactions, physical adsorption, or biotransformation, helping to restore the normal function of the soil.
[0003] In soil remediation, the natural characteristics of chemical flow tend to lead to diffusion along the path of least resistance. Shallow layers are typically closer to the injection source, may have better formation porosity, or experience significantly lower flow resistance due to their shallow burial depth compared to deeper and intermediate layers. This causes the chemical to preferentially flow to the shallow layers in the initial injection phase, resulting in insufficient chemical supply to the deeper and intermediate layers. Consequently, this leads to a layer imbalance, with over-remediation in the shallow layers and under-remediation in the deeper layers. To address this issue, we propose an in-situ thermal injection well. Utility Model Content
[0004] The purpose of this invention is to provide an in-situ thermal injection well to solve the problem of layer imbalance caused by insufficient reagent supply in the deep and middle layers, resulting in over-repair in the shallow layers and under-repair in the deep layers, as mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an in-situ thermal injection well, comprising an injection string, wherein a shallow final pressure regulating module, a mid-layer pressure triggering module, and a deep priority start module are sequentially fixed along the axial direction from top to bottom inside the injection string. The shallow final pressure regulating module is provided with a secondary spring and a secondary pressure sliding sleeve, and the mid-layer pressure triggering module is provided with a primary spring and a primary pressure sliding sleeve. The secondary spring is fixedly connected to one end of the secondary pressure sliding sleeve of the shallow final pressure regulating module, and the primary spring is fixedly connected to one end of the primary pressure sliding sleeve of the mid-layer pressure triggering module. The deep priority start module is a normally open bottom screen pipe structure, which is connected to the lower end of the injection string.
[0006] The deep-first start-up module is installed at the bottom of the injection tube. The deep-first start-up module includes a bottom screen tube that is fixedly connected to the bottom of the injection tube. A vortex generator is fixedly connected to the inner wall of the bottom screen tube. The vortex generator has a spiral blade structure. A sand cap is fixedly connected to the bottom end of the bottom screen tube.
[0007] The middle-layer pressure triggering module is installed in the middle of the injection column. One end of the primary spring is fixedly connected to the inner wall of the injection column, and the other end of the primary spring is fixedly connected to the primary pressure sliding sleeve. The injection column wall has a pressure transmission hole that penetrates through the injection column wall. The injection column wall has a middle-layer injection hole that is located within the coverage area of the primary pressure sliding sleeve. The inner wall of the injection column has a guide rail groove along the axial direction corresponding to the movement area of the primary pressure sliding sleeve. A slider that matches the guide rail groove is fixed on the outer periphery of the primary pressure sliding sleeve, and the slider is embedded in the guide rail groove.
[0008] The shallow final pressure regulating module is installed on the upper part of the injection column. One end of the secondary spring is fixedly connected to the inner wall of the injection column, and the other end of the secondary spring is fixedly connected to the secondary pressure sleeve. The stiffness of the secondary spring is greater than that of the primary spring. The injection column wall has a shallow injection hole, which is located within the coverage area of the secondary pressure sleeve. The inner wall of the injection column corresponds to the movement area of the secondary pressure sleeve and is fixedly connected to a guide rail along the axial direction. A locking block adapted to the guide rail is fixed on the outer periphery of the secondary pressure sleeve and is embedded in the guide rail.
[0009] The conical outer wall of the sand-collecting cap is provided with anti-slip ridges evenly distributed along the circumference.
[0010] The guide rail groove has rounded corners at both ends.
[0011] The bottom screen tube has screen holes on its wall, which are evenly distributed in a spiral shape along the circumference of the bottom screen tube.
[0012] The locking blocks are evenly distributed along the outer periphery of the secondary pressure sliding sleeve, and the number of locking blocks corresponds one-to-one with the number of guide rails.
[0013] The pressure conduction holes are evenly distributed along the circumference of the injection string, and the diameter of the pressure conduction holes is smaller than that of the middle layer injection holes.
[0014] The injection holes in the middle layer and the injection holes in the shallow layer are offset along the axial direction.
[0015] This utility model has at least the following beneficial effects:
[0016] In use, this utility model constructs an orderly injection of deep, middle and shallow layers by setting the difference in stiffness between the first and second level springs, which optimizes the problem of insufficient deep and middle layer repair in traditional equipment. The middle and shallow layer modules are precisely guided by the guide rail slider, ensuring that the sliding sleeve starts stably according to the preset pressure, ultimately improving the repair accuracy, stability and durability, and adapting to the needs of multiple contamination layers. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2This is a schematic diagram of the deep priority startup module of this utility model;
[0019] Figure 3 This is a schematic diagram of the middle layer pressure triggering module of this utility model;
[0020] Figure 4 This is a schematic diagram of the shallow final voltage regulation module of this utility model.
[0021] In the diagram: 1. Injection tubing; 2. Deep layer priority start module; 21. Bottom screen tube; 22. Eddy current generator; 23. Sand settling cap; 3. Middle layer pressure trigger module; 31. Primary pressure sleeve; 32. Primary spring; 33. Pressure transmission hole; 34. Middle layer injection hole; 35. Guide rail groove; 36. Slider; 4. Shallow layer final pressure adjustment module; 41. Secondary pressure sleeve; 42. Secondary spring; 43. Shallow layer injection hole; 44. Guide rail; 45. Locking block; 5. Anti-slip edge; 6. Rounded corner. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Example 1
[0024] Please see Figures 1 to 4 This utility model provides a technical solution: an in-situ thermal injection well, comprising: an injection string 1, wherein a shallow final pressure regulating module 4, a middle layer pressure triggering module 3, and a deep layer priority start module 2 are fixedly fixed axially from top to bottom inside the injection string 1. Each module is fixed to the inner wall of the injection string 1 by welding or threaded connection to ensure connection strength and sealing, and to avoid leakage during injection. The shallow final pressure regulating module 4 is provided with a secondary spring 42, and the middle layer pressure triggering module 3 is provided with a primary spring 32. The secondary spring 42 is fixedly connected to one end of the secondary pressure sliding sleeve 41 of the shallow final pressure regulating module 4, and the primary spring 32 is fixedly connected to one end of the primary pressure sliding sleeve 31 of the middle layer pressure triggering module 3. The deep layer priority start module 2 is a normally open bottom screen pipe structure. The bottom screen pipe 21 is fixedly connected to the lower end of the injection string 1. The overall structure forms a pressure gradient through the stiffness difference between the primary spring 32 and the secondary spring 42, so that each module is activated sequentially from deep to middle layer and finally to shallow layer, thereby realizing the precise layered injection of thermal injection agent.
[0025] The deep-first start module 2 is installed at the bottom of the injection column 1. The deep-first start module 2 includes a bottom screen tube 21 fixedly connected to the bottom end of the injection column 1. A vortex generator 22 is fixedly connected to the inner wall of the bottom screen tube 21. The spiral blades of the vortex generator 22 are fixed to the inner wall of the bottom screen tube 21 by welding, and the edge of the spiral blades is in contact with the inner wall of the bottom screen tube 21 to ensure the swirling effect while avoiding leakage of the injection. A sand-collecting cap 23 is fixedly connected to the lower end of the bottom screen tube 21. The sand-collecting cap 23 is connected to the bottom screen tube 21 by threads for easy disassembly and cleaning. When the hot injection begins to be injected, the initial pressure is low, and the middle and shallow modules are in the closed state. The injection is only transported downward through the normally open channel of the bottom screen tube 21. When flowing through the vortex generator 22, the spiral blades cause the injection to form a swirling flow, reducing the deposition of impurities on the inner wall of the screen tube. The sand-collecting cap 23 guides the impurities generated during the injection process to gather towards the center, avoiding blockage of the flow channel of the bottom screen tube 21 and ensuring the stable execution of deep injection.
[0026] The intermediate layer pressure trigger module 3 is installed in the middle of the injection string 1. The intermediate layer pressure trigger module 3 includes a primary spring 32 fixedly connected to the inner wall of the injection string 1. A primary pressure sleeve 31 is fixedly connected to the other end of the primary spring 32. Pressure transmission holes 33 penetrate the wall of the injection string 1, with one end leading to the end face of the primary pressure sleeve 31 away from the primary spring 32. The pressure transmission holes 33 are evenly distributed circumferentially along the injection string 1, and their diameter is smaller than that of the intermediate layer injection hole 34, ensuring that pressure is evenly transmitted to the end face of the primary pressure sleeve 31 while preventing excessive leakage of the injected material from the pressure transmission holes 33. The intermediate layer injection hole 34 is opened in the wall of the injection string 1 and is located within the coverage area of the primary pressure sleeve 31. The inner wall of the injection string 1 corresponds to the movement of the primary pressure sleeve 31. In the moving area, a guide groove 35 is provided along the axial direction. A slider 36 adapted to the guide groove 35 is fixed on the outer periphery of the primary pressure sleeve 31. The slider 36 is embedded in the guide groove 35. The two ends of the guide groove 35 are provided with rounded corners 6, which can reduce the frictional resistance and rigid collision when the slider 36 slides to the end, and avoid jamming or component wear. When the injection pressure gradually increases to the preload threshold of the primary spring 32, the pressure is transmitted to the end face of the primary pressure sleeve 31 through the pressure transmission hole 33, pushing the sleeve to compress the primary spring 32. The slider 36 slides stably along the guide groove 35, ensuring that the primary pressure sleeve 31 moves along the axial direction and gradually gets rid of the cover of the middle layer injection hole 34. The hot injection agent enters the middle layer area through the middle layer injection hole 34 and works with the deep layer module to complete the middle and deep layer hot injection operation.
[0027] The shallow final pressure regulating module 4 is installed on the upper part of the injection string 1. The shallow final pressure regulating module 4 includes a secondary spring 42 fixedly connected to the inner wall of the injection string 1. The other end of the secondary spring 42 is fixedly connected to a secondary pressure sleeve 41. The stiffness of the secondary spring 42 is greater than that of the primary spring 32. A shallow injection hole 43 is opened in the wall of the injection string 1. The shallow injection hole 43 is located within the coverage area of the secondary pressure sleeve 41. A guide rail 44 is fixedly connected axially to the inner wall of the injection string 1 corresponding to the movement area of the secondary pressure sleeve 41. A locking block 45 adapted to the guide rail 44 is fixed to the outer periphery of the secondary pressure sleeve 41. The locking blocks 45 are evenly distributed along the outer periphery of the secondary pressure sliding sleeve 41, and the number of locking blocks 45 corresponds one-to-one with the number of guide rails 44, ensuring that the secondary pressure sliding sleeve 41 is subjected to balanced force and moves smoothly. The locking blocks 45 are embedded in the guide rails 44. When the injection pressure continues to rise to the pre-tightening threshold of the secondary spring 42, the pressure pushes the secondary pressure sliding sleeve 41 to compress the secondary spring 42. The locking blocks 45 slide stably along the guide rails 44, so that the secondary pressure sliding sleeve 41 moves axially and is removed from the coverage of the shallow injection hole 43. The hot injection agent then enters the shallow area through the shallow injection hole 43, realizing the full-layer hot injection operation.
[0028] Example 2
[0029] In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that the conical outer wall of the sedimentation cap 23 is provided with anti-slip ridges 5 evenly distributed along the circumference, which can enhance the friction between the sedimentation cap 23 and the surrounding soil, avoid positional displacement caused by injection impact or soil loosening during the injection process, and improve the stability of the deep module. The two ends of the guide rail groove 35 are provided with rounded corners 6, which can reduce the frictional resistance and rigid collision when the slider 36 slides to the port, avoid jamming or component wear, and ensure the smooth movement of the first-level pressure sliding sleeve 31.
[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An in situ thermal injection well comprising: The injection string is characterized in that: the injection string is internally sequentially fixed from top to bottom along the axis with a shallow final pressure regulating module, a middle pressure trigger module and a deep preferential starting module, the shallow final pressure regulating module is internally provided with a secondary spring and a secondary pressure sleeve, the middle pressure trigger module is internally provided with a primary spring and a primary pressure sleeve, the secondary spring is fixedly connected with one end of the secondary pressure sleeve of the shallow final pressure regulating module, and the primary spring is fixedly connected with one end of the primary pressure sleeve of the middle pressure trigger module; the deep preferential starting module is a constant-opening bottom screen pipe structure, which is connected with the lower end of the injection string.
2. The in situ thermal injection well of claim 1, wherein: The deep preferential starting module is installed at the lowermost end of the injection string, the deep preferential starting module comprises a bottom screen pipe fixedly connected with the lower end of the injection string, a vortex generator is fixedly connected to the inner wall of the bottom screen pipe, the vortex generator is a spiral blade structure, and a sand setting cap is fixedly connected to the lower end of the bottom screen pipe.
3. The in situ thermal injection well of claim 1, wherein: The middle pressure trigger module is installed in the middle part of the injection string, one end of the primary spring is fixedly connected with the inner wall of the injection string, the other end of the primary spring is fixedly connected with the primary pressure sleeve, a pressure conduction hole is formed in the wall of the injection string, the pressure conduction hole penetrates through the wall of the injection string, a middle injection hole is formed in the wall of the injection string and located in the coverage range of the primary pressure sleeve, a guide rail groove is formed in the inner wall of the injection string corresponding to the movement area of the primary pressure sleeve along the axis, a sliding block fixedly connected with the guide rail groove is arranged on the outer periphery of the primary pressure sleeve, and the sliding block is embedded in the guide rail groove.
4. The in situ thermal injection well of claim 1, wherein: The shallow final pressure regulating module is installed in the upper part of the injection string, one end of the secondary spring is fixedly connected with the inner wall of the injection string, the other end of the secondary spring is fixedly connected with the secondary pressure sleeve, the rigidity of the secondary spring is greater than that of the primary spring, a shallow injection hole is formed in the wall of the injection string, the shallow injection hole is located in the coverage range of the secondary pressure sleeve, a guide rail is fixedly connected with the inner wall of the injection string corresponding to the movement area of the secondary pressure sleeve along the axis, a clamping block fixedly connected with the guide rail is arranged on the outer periphery of the secondary pressure sleeve, and the clamping block is embedded in the guide rail.
5. The in situ thermal injection well of claim 2, wherein: The conical outer wall of the sand setting cap is provided with anti-skid edges uniformly distributed in the circumferential direction.
6. The in situ thermal injection well of claim 3 wherein: The two end ports of the guide rail groove are provided with round corners.
7. The in situ thermal injection well of claim 2, wherein: The wall of the bottom screen pipe is provided with screen holes, and the screen holes are uniformly distributed in a spiral shape along the circumferential direction of the bottom screen pipe.
8. The in situ thermal injection well of claim 4, wherein: The clamping blocks are uniformly distributed along the outer periphery of the secondary pressure sleeve, and the number of clamping blocks corresponds to the number of guide rails.
9. The in situ thermal injection well of claim 3 wherein: The pressure conduction holes are uniformly distributed along the circumferential direction of the injection string, and the hole diameter of the pressure conduction holes is smaller than the hole diameter of the middle injection hole.
10. The in situ thermal injection well of claim 3 wherein: The hole positions of the middle injection hole and the shallow injection hole are axially staggered.