Multi-section type well cementation water stop device

Abstract

The utility model relates to the technical field of well cementation and water stop, in particular to a multi-section type well cementation and water stop device which comprises a ground, a well casing body is arranged in the ground, the bottom of the inner wall of the well casing body is filled with a stone layer, a clay ball layer is placed on the top of the stone layer, and a water stop bridge is placed on the top of the clay ball layer. A water stopping bridge is arranged on the well casing body, a water stopping plug frame is arranged in the middle, close to the inner wall of the water stopping bridge, of the water stopping bridge, and a filling pipe is arranged in the well casing body. And the third water stop adopts a'boot wearing and cap wearing 'water stop process and is subjected to'bridging' treatment, so that the multi-section water stop effect in the well cementation water stop process is realized.

Description

Technical Field

[0001] The utility model relates to a multi-section well cementing water-stopping device, belonging to the technical field of well cementing water-stopping. Background Art

[0002] Cementing and water-stopping are an essential step in the construction of hydrogeological drilling and water supply wells. Cementing and water-stopping technology includes casing running and cementing, that is, running casing into the well and injecting cement into the annular space between the wellbore and the casing. Its main purpose is to protect and support the casing in hydrogeological drilling and water supply wells, isolate non-water-extraction strata and aquifers, and isolate the hydraulic connection between non-target strata and target strata.

[0003] Since conventional cementing materials and cement slurry casing circulation cementing and water-stopping are mostly used in the current cementing and water-stopping construction process, the cement slurry in the conventional internal circulation cementing method is easily diluted during the well entry process, resulting in insufficient cement ring sealing height, reduced cement stone strength and poor cementing quality, which has brought certain adverse effects on actual use and therefore needs to be improved. Utility Model Content

[0004] The purpose of the present invention is to provide a multi-stage cementing water-stopping device. The present invention uses three water-stopping operations in succession during the cementing water-stopping operation. The first two water-stopping operations require the cement slurry to return to the surface, and the third water-stopping operation adopts a "boot-and-hat" water-stopping process and performs a "bridge-building" treatment, thereby achieving a multi-stage water-stopping effect in the cementing water-stopping process to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A multi-stage cementing and water-stopping device includes a ground surface, a well pipe body is opened inside the ground surface, the bottom of the inner wall of the well pipe body is filled with a stone layer, a clay ball layer is placed on the top of the stone layer, a water-stop bridge is placed on the top of the clay ball layer, a water-stop plug rack is placed on the water-stop bridge near the middle of its inner wall, and a filling pipe is placed inside the well pipe body.

[0007] Furthermore, the interior of the waterstop bridge is filled with cement slurry, and the cement slurry completely covers and fills the interior of the waterstop bridge.

[0008] Furthermore, the main body of the water stopper frame is a water stopper wooden plug, and the outside of the water stopper wooden plug is wrapped and connected with an expansion tape.

[0009] Furthermore, the number of the expansion tape is at least two layers, and the expansion tape of at least two layers is connected to the outer side of the top of the water stopper in a ring shape.

[0010] Furthermore, a sealing stretch sleeve is fixedly connected to the side surface of the water-stopping wooden plug near the top thereof, and the expansion tape is located in the inner wall of the sealing stretch sleeve.

[0011] Furthermore, the top of the filling pipe is an upper discharge pipe, the bottom of the upper discharge pipe is fixedly connected to an anti-corrosion rubber tube, the bottom end of the anti-corrosion rubber tube is fixedly connected to a lower discharge pipe, and the inner wall of the upper discharge pipe is fixedly connected to an anti-collision inclined panel.

[0012] Furthermore, the inner wall of the lower discharge pipe is fixedly connected to a side slide, the surface of the side slide is slidably connected to a buffer discharge cylinder, the side of the buffer discharge cylinder is fixedly connected to a shock-absorbing telescopic rod with a shock-absorbing spring, the bottom of the shock-absorbing telescopic rod is fixedly connected to the surface of the side slide, the bottom of the lower discharge pipe is rotatably connected to a one-way valve plate through a pin shaft seat with a torsion spring, the side of the inner wall of the lower discharge pipe is fixedly connected to a baffle, and the baffle is located directly above the one-way valve plate.

[0013] The beneficial effects of the utility model are:

[0014] The internal water-stopping operation in the well pipe body can be carried out three times in succession. The first two water-stopping operations require the cement slurry to return to the surface. The third water-stopping adopts the "boot-wearing and cap-wearing" water-stopping process, that is, "bridge-building" treatment is carried out before the third cementing and water-stopping. The water-stopping bridge is used to carry out water-stopping positioning and separation. The water-stopping material is filled in the bottom of the inner wall of the well pipe body, that is, the stone layer is first put in to retain the water-bearing section, and then the clay ball layer and cement slurry are added to carry out secondary reinforcement and water-stopping, both of which play the role of water-blocking layer. The cement slurry is then solidified at the bottom of the belt. After cementing, lower the filling pipe, use the one-way valve plate in the filling pipe to form a check grouting, and jet grouting from top to bottom through the inside of the anti-corrosion rubber tube to form a buffering aggregate discharge effect in the buffer discharge cylinder in the lower discharge pipe. The well wall pipe in the well pipe body is connected with a water stop plug rack for anti-collision, and the top side of the water stop plug rack is provided with multiple layers of wrapped expansion tape, and the external sealing stretch sleeve can help achieve a permanent water stop effect, carry out cementing and water stop work, and realize a multi-stage water stop effect in the cementing and water stop process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the specific embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of a multi-stage cementing and water-stopping device of the utility model;

[0017] Figure 2 This is a front cross-sectional view of a multi-stage cementing water-stopping device of the utility model;

[0018] Figure 3 This is a front view of a filling pipe in a multi-section cementing water-stopping device of the utility model;

[0019] Figure 4 This is a front cross-sectional view of an upper discharge pipe in a multi-section cementing water-stopping device of the present utility model;

[0020] Figure 5 This is a front cross-sectional view of a lower discharge pipe in a multi-section cementing water-stopping device of the utility model;

[0021] Figure 6 This is an enlarged view of point A of a multi-stage cementing water-stopping device of the utility model;

[0022] Numbers in the figure: 1. Ground; 2. Well pipe body; 3. Stone layer; 4. Clay ball layer; 5. Waterstop bridge; 6. Waterstop plug rack; 7. Filling pipe; 8. Cement slurry; 9. Expansion tape; 10. Sealing stretch sleeve; 11. Upper discharge pipe; 12. Anti-corrosion rubber pipe; 13. Lower discharge pipe; 14. Anti-collision inclined panel; 15. Side slide plate; 16. Buffer discharge barrel; 17. Shock-absorbing telescopic rod; 18. One-way valve plate; 19. Baffle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1, please refer to Figures 1-6 , the utility model provides a technical solution:

[0025] A multi-stage cementing and water-stopping device includes a ground surface 1, a well pipe body 2 is provided inside the ground surface 1, the bottom of the inner wall of the well pipe body 2 is filled with a stone layer 3, a clay ball layer 4 is placed on the top of the stone layer 3, a water-stop bridge 5 is placed on the top of the clay ball layer 4, a water-stop plug frame 6 is placed on the water-stop bridge 5 near the middle of its inner wall, and a filling pipe 7 is placed inside the well pipe body 2.

[0026] Specifically, such as Figures 1-6 As shown, the interior of the waterstop bridge 5 is filled with cement slurry 8, and the cement slurry 8 completely covers and fills the interior of the waterstop bridge 5. Adding cement slurry 8 can perform secondary reinforcement and water stopping, and both act as a water barrier.

[0027] Specifically, such as Figures 1-6As shown, the top of the filling pipe 7 is the upper discharge pipe 11, the bottom of the upper discharge pipe 11 is fixedly connected to an anti-corrosion rubber tube 12, the bottom end of the anti-corrosion rubber tube 12 is fixedly connected to a lower discharge pipe 13, and the inner wall of the upper discharge pipe 11 is fixedly connected to an anti-collision inclined panel 14. The inner wall of the lower discharge pipe 13 is fixedly connected with a side slide 15, and the surface of the side slide 15 is slidably connected with a buffer discharge cylinder 16, and the side of the buffer discharge cylinder 16 is fixedly connected with a shock-absorbing telescopic rod 17 with a shock-absorbing spring, and the bottom of the shock-absorbing telescopic rod 17 is fixedly connected to the surface of the side slide 15, and the bottom of the lower discharge pipe 13 is rotatably connected with a one-way valve plate 18 through a pin shaft seat with a torsion spring, and the side of the inner wall of the lower discharge pipe 13 is fixedly connected with a baffle 19, and the baffle 19 is located directly above the one-way valve plate 18. The material will first pass through the anti-collision inclined panel 14 in the upper discharge pipe 11 for buffering and water-stopping material, and then pass through the inside of the anti-corrosion rubber tube 12 for jet grouting from top to bottom. A buffering and aggregation discharge effect can be formed in the buffer discharge cylinder 16 in the lower discharge pipe 13, and the upper material is buffered and maintained during the descent process under the shock-absorbing unloading force of the shock-absorbing telescopic rod 17, and the water-stop material is discharged downward through the one-way valve plate 18.

[0028] Example 2, please refer to Figures 1-6 The difference between this embodiment and embodiment 1 is that the main body of the waterstop plug frame 6 is a waterstop wooden plug, and the outside of the waterstop wooden plug is wrapped with an expansion tape 9. The number of expansion tapes 9 is at least two layers, and the number of expansion tapes 9 of at least two layers is connected in a ring shape at the top outside of the waterstop wooden plug. A sealing stretch sleeve 10 is fixedly connected to the side of the waterstop wooden plug near its top, and the expansion tape 9 is located in the inner wall of the sealing stretch sleeve 10. The well wall pipe in the well pipe body 2 is connected to the waterstop plug frame 6 for anti-collision, and multiple layers of wrapped expansion tapes 9 are provided on the top side of the waterstop plug frame 6. The sealing stretch sleeve 10 used on the outside can help achieve a permanent waterstop effect and perform cementing and waterstop work.

[0029] Working principle of the present invention: when in use, according to the electric logging data, rock cuttings logging and drilling situation analysis, three water-stopping operations can be carried out successively. The first two water-stopping operations require the cement slurry 8 to return to the surface. The third water-stopping operation adopts the "boot-wearing and hat-wearing" water-stopping process, that is, a "bridge-building" process is carried out before the third cementing and water-stopping operation. The water-stopping layer is determined according to the electric logging data, the drilling coring situation and the specific position of the heat storage layer, and relatively hard, complete and regularly pore-diameter rocks are selected as the water-stopping section, thereby ensuring that the water-bearing section and the open hole water-taking section are separated. The water-stopping bridge 5 is used for water-stopping positioning and separation, and the water-stopping material is filled in the bottom of the inner wall of the well pipe body 2, that is, the stone layer 3 is first put in to retain the water-bearing section, and then the clay ball layer 4 and cement slurry 8 are added for secondary reinforcement and water-stopping, both of which act as a water-blocking layer, and then the water below it is brought in. After the mud 8 solidifies, the filling pipe 7 is lowered, and the one-way valve plate 18 in the filling pipe 7 is used to form a check grouting. The material will first pass through the anti-collision inclined plate 14 in the upper discharge pipe 11 for buffering and water-stopping material, and then pass through the inside of the anti-corrosion rubber tube 12 for jet grouting from top to bottom. A buffering and aggregate discharge effect can be formed in the buffer discharge cylinder 16 in the lower discharge pipe 13. The upper material is buffered and maintained during the descent process under the shock-absorbing unloading force of the shock-absorbing telescopic rod 17, and the water-stopping material is discharged downward through the one-way valve plate 18. The well wall pipe in the well pipe body 2 is connected to the water-stop plug rack 6 for anti-collision, and the top side of the water-stop plug rack 6 is provided with multiple layers of wrapped expansion tape 9, and the external sealing stretch sleeve 10 can help achieve a permanent water-stopping effect, perform cementing and water-stopping work, and realize a multi-stage water-stopping effect in the cementing and water-stopping process.

[0030] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage cementing and water-stopping device, comprising a ground surface (1), wherein a well pipe body (2) is provided inside the ground surface (1), characterized in that: The bottom of the inner wall of the well pipe body (2) is filled with a stone layer (3), a clay ball layer (4) is placed on the top of the stone layer (3), a water stop bridge (5) is placed on the top of the clay ball layer (4), a water stop plug frame (6) is placed on the water stop bridge (5) near the middle of its inner wall, and a filling pipe (7) is placed inside the well pipe body (2).

2. The multi-stage cementing water-stopping device according to claim 1, characterized in that: The interior of the waterstop bridge (5) is filled with cement slurry (8), and the cement slurry (8) completely covers and fills the interior of the waterstop bridge (5).

3. The multi-stage cementing water-stopping device according to claim 1, characterized in that: The main body of the water stopper frame (6) is a water stopper wooden plug, and the outside of the water stopper wooden plug is wrapped and connected with an expansion tape (9).

4. The multi-stage cementing water-stopping device according to claim 3, characterized in that: The number of the expansion tape (9) is at least two layers, and the number of the expansion tape (9) is at least two layers and is connected to the outer side of the top of the water stopper in a ring shape.

5. The multi-stage cementing water-stopping device according to claim 3, characterized in that: A sealing stretch sleeve (10) is fixedly connected to the side surface of the water-stopping wooden plug near the top thereof, and the expansion tape (9) is located in the inner wall of the sealing stretch sleeve (10).

6. The multi-stage cementing water-stopping device according to claim 1, characterized in that: The top of the filling pipe (7) is an upper discharge pipe (11), the bottom of the upper discharge pipe (11) is fixedly connected to an anti-corrosion rubber pipe (12), the bottom end of the anti-corrosion rubber pipe (12) is fixedly connected to a lower discharge pipe (13), and the inner wall of the upper discharge pipe (11) is fixedly connected to an anti-collision inclined panel (14).

7. The multi-stage cementing water-stopping device according to claim 6, characterized in that: The inner wall of the lower discharge pipe (13) is fixedly connected to a side slide (15), the surface of the side slide (15) is slidably connected to a buffer discharge cylinder (16), the side of the buffer discharge cylinder (16) is fixedly connected to a shock-absorbing telescopic rod (17) with a shock-absorbing spring, the bottom of the shock-absorbing telescopic rod (17) is fixedly connected to the surface of the side slide (15), the bottom of the lower discharge pipe (13) is rotatably connected to a one-way valve plate (18) through a pin shaft seat with a torsion spring, and the side of the inner wall of the lower discharge pipe (13) is fixedly connected to a baffle (19), and the baffle (19) is located directly above the one-way valve plate (18).

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