Self-filling type intubation grouting well completion tool
By using the socket tube and slider of the self-filling intubation grouting and completion tool in combination, the self-filling and effective seating of the low-pressure casing in an acidic geological environment is achieved, solving the problems of susceptibility to corrosion and lax sealing of the casing, and improving construction stability.
Patent Information
- Application Number
- CN202422141443.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing low-pressure casing is prone to corrosion and damage in acidic and corrosive geological environments, and foreign matters are prone to poor sealing during drilling, causing cement slurry to penetrate into the casing, causing the equipment to fail to go down the well or the casing to rupture, reducing construction stability.
The self-filling tube grouting completion tool is used to combine the socket tube and the slider to allow cement slurry to be injected into the well hole through the through holes on the slider. There is no need to open the flip plate through the pressure of the cement slurry to realize self-filling. After grouting, use a striker to push the slider out of the socket tube. The flip plate automatically closes the casing to prevent cement slurry from entering the casing.
It effectively avoids cement slurry entering the casing or causing it to rupture, improves the stability of mine grouting completion construction, and avoids the explosion of low-pressure casing and the scrapping of the whole well.
Smart Images
Figure CN222909985U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of grouting and cementing, and in particular relates to a self-filling intubation grouting completion tool. Background Art
[0002] In order to reinforce and stabilize the wellbore after drilling for mineral development, cement slurry needs to be poured into the wellbore through the casing. Filling the rock cracks and cavities inside the wellbore with cement slurry can enhance the mechanical properties of the rock mass, improve the overall stability and bearing capacity of the geological body, and prevent accidents such as rock collapse, rock formation deformation or collapse. Most of the existing casings are made of steel pipes, and a float valve that can be automatically closed is provided at one end of the casing close to the bottom of the well. During grouting, the grouting pipe is inserted into the casing, and cement slurry with a certain pressure is output through the grouting pipe to push the flap of the float valve open, so that cement slurry is injected into the wellbore. When the cement slurry stops being output, the flap automatically closes the casing. However, for some geological environments containing acidic and corrosive substances, steel pipes are easily corroded and damaged, resulting in a low service life of the casing.
[0003] At present, in order to meet the needs of mineral development, low-pressure casing made of PVC is mostly used for mines containing acidic and corrosive substances. Since low-pressure casing is sensitive to pressure, it is impossible to grout by opening the float valve with cement slurry, otherwise it is easy to cause the low-pressure casing to burst. After the grouting of the low-pressure casing is completed, the pressure seat seal method is mostly used to seal the two sides of the low-pressure casing close to the bottom of the well and the wellhead respectively. The pressure seat seal is to fix two annular limit blocks on the outside of the grouting pipe, and an annular step is provided on the inner wall of the low-pressure casing close to the bottom of the well. The gravity of the grouting pipe is used to make the annular limit block close to the bottom of the well abut against the annular step, and the other annular limit block is fixedly connected to the inner wall of the low-pressure casing by thread, so as to realize the seat seal of the casing, and the grouting pipe is taken out after the cement slurry in the wellbore solidifies.
[0004] However, during drilling, foreign objects such as stones in the mud are easy to fall on the annular steps of the low-pressure casing, resulting in poor sealing between the annular steps and the annular limit blocks. When the amount or pressure of cement slurry poured into the wellbore is large, the cement slurry will penetrate into the low-pressure casing through the gap between the annular steps and the annular limit blocks, causing a large amount of cement slurry to infiltrate the low-pressure casing, resulting in the failure of the equipment used in the subsequent production of the mine to be smoothly lowered into the well. What is more serious is that when the annular limit block at the wellhead is tightly sealed with the low-pressure casing, the cement slurry pressure in the low-pressure casing will continue to increase. When the threads at the connection between adjacent low-pressure casings cannot withstand the pressure, the low-pressure casing will rupture from the inside out, causing the entire well to be scrapped and reducing the stability of the mine grouting completion construction. Utility Model Content
[0005] In view of this, the utility model provides a self-filling tube grouting completion tool to solve the deficiencies in the prior art. The utility model can effectively seal the casing, thereby preventing cement slurry from entering the casing or causing it to rupture, thereby improving the stability of mine grouting completion construction.
[0006] The technical solution of the utility model is: a self-filling plug-in grouting completion tool, which is configured and connected to a casing in a wellbore, and the casing is sealed after the grouting pipe is grouted into the wellbore through the casing, including a socket pipe coaxially arranged in the casing, the socket pipe is fixedly and sealedly connected to the inner wall of the casing, a slider is arranged in the socket pipe, the slider abuts against the inner wall of the socket pipe, a through hole is opened on the slider along the center line direction of the socket pipe, cement slurry is injected into the wellbore through the through hole, a flap is hinged to one end of the socket pipe close to the bottom of the well, the flap abuts against one end of the slider, an elastic member is arranged on the hinge shaft of the flap, and is used to drive the flap to flip to the side close to the socket pipe, a striker is fixedly arranged at the end of the grouting pipe, and the striker pushes the slider to move downward and slide out of the socket pipe, so that the flap is buckled on the socket pipe to close it.
[0007] Preferably, a limiting hole is opened on one side of the socket tube along its radial direction, a stop pin is passed through the limiting hole, the stop pin is slidably connected to the limiting hole along its center line direction, an annular limiting groove is opened on the outer side of the slider around its circumference, one end of the stop pin extends into the annular limiting groove and abuts against it.
[0008] Preferably, a first annular step is provided on the inner wall of the socket tube and is coaxial with the center line thereof, the first annular step is located at one end of the socket tube close to the bottom of the well, an arc-shaped protrusion is fixedly provided on the outer side of the slider and is coaxial with the center line of the socket tube, the arc-shaped protrusion abuts against the first annular step, and when the slider slides out of the socket tube, the flap is buckled on the first annular step and abuts against it.
[0009] Preferably, an O-ring is fixedly provided on the first annular step, and the arc-shaped protrusion abuts against the O-ring, and the flap abuts against the O-ring when the flap is buckled.
[0010] Preferably, a second annular step is provided on the side of the socket tube close to the wellhead, a plug tube is fixedly provided at the end of the grouting tube and is coaxial with the center line of the grouting tube, the plug tube is cooperatively connected to the second annular step, and one end of the striker is fixedly connected to the plug tube and is parallel to the center line of the plug tube.
[0011] Preferably, the striker is in a tubular shape, the tubular shape is coaxial with the center line of the plug tube, and is detachably fixedly connected to the plug tube.
[0012] Preferably, a cross-shaped connecting frame is provided at one end of the through hole away from the flap, the cross-shaped connecting frame is perpendicular to the center line of the through hole, and the end of the cross-shaped connecting frame is fixedly connected to the inner wall of the through hole.
[0013] Preferably, a chamfer is provided on the inner side of one end of the socket pipe close to the wellhead, and a centralizing wing is fixedly provided on the outer side of the grouting pipe, and the centralizing wing is cooperatively connected with the chamfer.
[0014] Preferably, it also includes a guide shoe and an outer sleeve, wherein the outer sleeve is fixedly sleeved on the outside of the socket pipe, the outer sleeve is fixedly and sealedly connected to the inner wall of the sleeve, and the guide shoe is fixed at one end of the outer sleeve away from the wellhead.
[0015] Preferably, the interior of the guide shoe is hollow and communicated with the outer sleeve, and a plurality of slurry outlet holes are arranged around the guide shoe, and the slurry outlet holes are communicated with the interior of the guide shoe.
[0016] Compared with the prior art, the utility model provides a self-grouting tube-inserted grouting completion tool, which is used in conjunction with a socket tube and a slider, so that the flap and the socket tube cannot be closed during grouting, and the socket tube is in an open state. Cement slurry is injected into the wellbore through the through hole on the slider, and there is no need to open the flap for grouting by the pressure of cement slurry, thereby realizing self-grouting of special well types such as low-pressure casing that cannot withstand large displacement and high pressure. At the same time, after grouting, the grouting tube is used to drive the striker to push the slider downward to slide out of the socket tube, and the flap is automatically buckled on the socket tube to seal it, effectively sealing the casing, thereby preventing cement slurry from entering the casing or causing it to rupture, thereby improving the stability of mine grouting completion construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the grouting equipment of the utility model;
[0018] Figure 2 It is a front view of the socket tube of the utility model;
[0019] Figure 3 It is a side view of the socket tube of the utility model;
[0020] Figure 4 It is a cross-sectional view of the socket tube of the utility model;
[0021] Figure 5 It is a top view of the first embodiment of the slider of the utility model;
[0022] Figure 6 It is a cross-sectional view of the first embodiment of the slider of the utility model;
[0023] Figure 7 It is a top view of a second embodiment of the slider of the utility model;
[0024] Figure 8 It is a cross-sectional view of a second embodiment of the slider of the utility model;
[0025] Fig. 9 It is a top view of the flap of the utility model;
[0026] Fig.10 This utility model Fig. 9 BB section view in;
[0027] Fig.11 It is a front view of the spring of the utility model;
[0028] Fig.12 It is a top view of the spring of the utility model;
[0029] Fig.13 It is a cross-sectional view of the outer sleeve of the utility model;
[0030] Fig.14 This utility model Fig.13 A is an enlarged schematic diagram;
[0031] Fig.15 It is a cross-sectional view of the guide shoe of the utility model;
[0032] Fig.16 It is a cross-sectional view of the guide shoe connector of the utility model;
[0033] Fig.17 It is a cross-sectional view of the head of the guide shoe of the utility model;
[0034] Fig.18 It is a partial cross-sectional view of the grouting pipe of the utility model;
[0035] Fig.19 This is a grouting state diagram of the first embodiment of the grouting equipment of the utility model;
[0036] Fig. 20 This is a closed state diagram of the first embodiment of the grouting equipment of the utility model;
[0037] Fig.21 This is a grouting state diagram of the second embodiment of the grouting equipment of the utility model;
[0038] Fig. 22 It is a closed state diagram of the second embodiment of the grouting equipment of the utility model. DETAILED DESCRIPTION
[0039] The utility model provides a self-filling intubation grouting completion tool, which is combined with Figures 1 to 22 The utility model is described with reference to the structural schematic diagram of FIG.
[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solution of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0041] At present, in order to meet the needs of mineral development, low-pressure casing made of PVC is mostly used for mines containing acidic and corrosive substances. Since low-pressure casing is sensitive to pressure, it is impossible to grout by opening the float valve with cement slurry, otherwise it is easy to cause the low-pressure casing to burst. After the grouting of the low-pressure casing is completed, the pressure seat seal method is mostly used to seal the two sides of the low-pressure casing close to the bottom of the well and the wellhead respectively. The pressure seat seal is to fix two annular limit blocks on the outside of the grouting pipe, and an annular step is provided on the inner wall of the low-pressure casing close to the bottom of the well. The gravity of the grouting pipe is used to make the annular limit block close to the bottom of the well abut against the annular step, and the other annular limit block is fixedly connected to the inner wall of the low-pressure casing by thread, so as to realize the seat seal of the casing, and the grouting pipe is taken out after the cement slurry in the wellbore solidifies.
[0042] However, during drilling, foreign objects such as stones in the mud are easy to fall on the annular steps of the low-pressure casing, resulting in poor sealing between the annular steps and the annular stopper. When the amount or pressure of cement slurry poured into the wellbore is large, the cement slurry will penetrate into the low-pressure casing through the gap between the annular steps and the annular stopper, causing a large amount of cement slurry to infiltrate the low-pressure casing, resulting in the failure of the equipment used in the subsequent production of the mine to be smoothly lowered into the well. More seriously, when the annular stopper at the wellhead is tightly sealed with the low-pressure casing (since the threads can be flushed with water at the wellhead, the annular stopper at the wellhead can avoid poor sealing between the low-pressure casing), the cement slurry pressure in the low-pressure casing will continue to increase. When the threads at the connection between adjacent low-pressure casings cannot withstand the pressure, the low-pressure casing will rupture from the inside out, causing the entire well to be scrapped, reducing the stability of the mine grouting completion construction.
[0043] Based on the above problems, an embodiment of the utility model provides a self-grouting tube grouting completion tool, which is used in conjunction with a socket tube and a slider, so that the flap and the socket tube cannot be closed during grouting, and the socket tube is in an open state. Cement slurry is injected into the wellbore through the through hole on the slider. There is no need to open the flap for grouting by the pressure of cement slurry, thereby realizing self-grouting of special well types such as low-pressure casing that cannot withstand large displacement and high pressure. At the same time, after grouting, the grouting tube is used to drive the striker to push the slider downward to slide out of the socket tube, and the flap automatically buckles on the socket tube to seal it, effectively sealing the casing, thereby preventing cement slurry from entering the casing or causing it to rupture, thereby improving the stability of mine grouting completion construction.
[0044] Reference Figure 1 This is a structural schematic diagram of the grouting equipment of this embodiment, a self-filling plug-in grouting completion tool, which is configured and connected to the casing in the wellbore. The grouting pipe is sealed after grouting into the wellbore through the casing, including a socket pipe 2 coaxially arranged in the casing, the socket pipe 2 is fixedly and sealedly connected to the inner wall of the casing, a slider 4 is arranged in the socket pipe 2, the slider 4 abuts against the inner wall of the socket pipe 2, a through hole is opened on the slider 4 along the center line direction of the socket pipe 2, cement slurry is injected into the wellbore through the through hole, a flap 3 is hinged to one end of the socket pipe 2 close to the bottom of the well, the flap 3 abuts against one end of the slider 4, an elastic member is arranged on the hinge shaft of the flap 3, and is used to drive the flap 3 to flip to the side close to the socket pipe 2, a striker 11 is fixedly arranged at the end of the grouting pipe, and the striker 11 pushes the slider 4 to move downward and slide out of the socket pipe 2, so that the flap 3 is buckled on the socket pipe 2 to close it.
[0045] The self-filling intubation grouting completion tool disclosed in this embodiment is used in conjunction with a socket pipe and a slider. Fig.19 This is a grouting state diagram of the first embodiment of the grouting equipment, which can make the flap in the open state during grouting, so that cement slurry can be injected into the wellbore through the through hole on the slider, without the need to open the flap by the pressure of the cement slurry, so as to realize the self-grouting of the special well type of low-pressure casing that cannot withstand large displacement and high pressure. At the same time, after grouting, the grouting pipe is used to push the striker to make the slider move downward and slide out of the socket pipe. Fig. 20 This is a closed state diagram of the first embodiment of the grouting equipment, which enables the flap to automatically snap onto the socket pipe to seal it, thereby preventing cement slurry from pushing open the flap and effectively sealing the low-pressure bushing.
[0046] Reference Figure 3 is a side view of the socket tube of this embodiment. A mounting groove is provided at one end of the socket tube 2 close to the bottom of the well. The hinge shaft is provided on the mounting groove and is rotatably connected to the socket tube 2. Fig. 9 is a top view of the flap of this embodiment, Fig.10The sectional view of the flap 3 shows that two connecting plates 31 are provided on one side of the flap 3 close to the mounting groove and are perpendicular to the hinge axis. The hinge axis passes through the connecting plates 31 and is fixedly connected to the connecting plates 31. Fig.11 is a front view of the elasticity of this embodiment, Fig.12 The elastic top view of this embodiment shows that the elastic member adopts spring 7, which is specifically a torsion spring. The torsion spring is sleeved on the hinge shaft and located between the two connecting plates. A recessed groove is provided on the flap 3, and the output arm of the torsion spring is placed in the recessed groove.
[0047] In addition, the material of the torsion spring 7 may be 60Si2Mn / 50CrVA.
[0048] As a further optimization scheme, in this embodiment, a limiting hole 20 is opened along the radial direction of the socket tube 2 on one side thereof, and a stop pin 21 is passed through the limiting hole 20, and the stop pin 21 is slidably connected with the limiting hole 20 along the center line direction thereof, Figure 6 This is a top view of the first embodiment of the slider. An annular limiting groove 40 is provided on the outer side of the slider 4 around its circumference. One end of the stop pin 21 extends into the annular limiting groove 40 and abuts against it.
[0049] In this embodiment, the stop pin 21 in the limit hole 20 is used in conjunction with the annular limit groove 40 on the slider 4 to fix the slider 4, thereby preventing the slider 4 from moving downward during grouting and causing the flap to be buckled on the socket tube 2, resulting in incorrect sealing of the sleeve. After the grouting is completed, when the striker pushes the slider 4 to move downward, the stop pin 21 automatically breaks into two parts, allowing the slider 4 to slide out of the socket tube 2 smoothly, allowing the flap 3 to smoothly close the socket tube 2.
[0050] In addition, refer to Figure 7 is a top view of a second embodiment of a slider, Figure 8 It is a cross-sectional view of the second embodiment of the slider. The outer diameter of the slider 4 away from the flap 3 gradually increases from the end close to the striker 11 to the other end. In essence, the outer contour of the slider 4 close to the striker 11 is conical.
[0051] The self-filling intubation grouting completion tool disclosed in this embodiment is used in conjunction with a socket pipe and a slider. Fig.21 This is a grouting state diagram of the second embodiment of the grouting equipment, which can make the flap in the open state during grouting, so that cement slurry can be injected into the wellbore through the through hole on the slider, without the need to open the flap by the pressure of the cement slurry, so as to realize the self-grouting of the special well type of low-pressure casing that cannot withstand large displacement and high pressure. At the same time, after grouting, the grouting pipe is used to push the striker to make the slider move downward and slide out of the socket pipe. Fig. 22 This is a closed state diagram of the second embodiment of the grouting equipment, which enables the flap to automatically snap onto the socket pipe to seal it, thereby preventing cement slurry from pushing open the flap and effectively sealing the low-pressure bushing.
[0052] The above embodiment introduces a second embodiment of the slider. When the outer contour of the slider 4 close to the striker 11 is conical, a plurality of grouting holes 41 can be opened at equal intervals along the center line direction of the slider 4 close to the striker 11, which can effectively increase the flow rate of the grouting.
[0053] As a further optimization scheme, in this embodiment, a first annular step is provided on the inner wall of the socket tube 2 and is coaxial with the center line thereof. The first annular step is located at one end of the socket tube 2 close to the bottom of the well. An arc-shaped protrusion is fixedly provided on the outer side of the slider 4 and is coaxial with the center line of the socket tube 2. The arc-shaped protrusion abuts against the first annular step. When the slider 4 slides out of the socket tube 2, the flap 3 is buckled on the first annular step and abuts against it.
[0054] In this embodiment, the first annular step on the inner wall of the socket tube 2 is used in conjunction with the arc-shaped protrusion on the slider 4 to limit the slider 4, thereby preventing the cement slurry from pushing the slider 4 to move upward and preventing the flap 3 from automatically snapping onto the socket tube 2. At the same time, after the grouting is completed, when the slider slides out of the socket tube 2, the first annular step is used to increase the contact area with the flap 3, thereby preventing the cement slurry from causing a loose seal between the socket tube 2 and the flap 3, thereby further improving the sealing effect.
[0055] Reference Figure 4 It is a cross-sectional view of the socket tube of this embodiment. As a further optimization scheme, in this embodiment, an O-ring 22 is fixedly provided on the first annular step, the arc-shaped protrusion abuts against the O-ring 22, and the flap 3 abuts against the O-ring 22 when buckled.
[0056] In this embodiment, the O-ring 22 is used in conjunction with the arc-shaped protrusion and the stop pin 21 to further improve the stability of the slider 4. At the same time, the O-ring 22 is used in conjunction with the flap 3. The elasticity of the O-ring 22 can further prevent cement slurry from causing a loose seal between the socket tube 2 and the flap 3, thereby improving the sealing of the socket tube 2.
[0057] In the present embodiment, when installing the O-ring 22, evenly apply 8018 epoxy slow-drying glue on the bottom of the R arc of the first annular step to ensure that the O-ring 22 will not fall off, apply ink on the lower end surface of the O-ring, check the fit between the flap 3 and the O-ring, and use a file to trim the flap 3 if necessary. Pour water from the upper end of the socket tube 2 to check for water leakage and check the sealing performance of the flap 3 and the O-ring.
[0058] As a further optimization scheme, in this embodiment, a second annular step is opened on the side of the socket tube 2 close to the wellhead, and a plug tube 1 is fixedly provided at the end of the grouting pipe and is coaxial with the center line of the grouting pipe. The plug tube 1 is cooperatively connected with the second annular step, and one end of the striker 11 is fixedly connected with the plug tube 1 and is parallel to the center line of the plug tube 1.
[0059] In this embodiment, the plug tube 1 on the grouting pipe is extended into the socket tube 2 for grouting. When it is necessary to use the striker 11 to push the slider 4 out of the socket tube 2, a second annular step is provided on the socket tube 2, so that when the plug tube 1 moves downward to the second annular step, the striker completely pushes the slider 4 out of the socket tube 2.
[0060] As a further optimization solution, in this embodiment, the striker 11 is of tubular type, which is coaxial with the center line of the plug tube 1 and is detachably fixedly connected to the plug tube 1 .
[0061] In this embodiment, the firing pin 11 is configured as a tube, so that during grouting, the firing pin 11 can be used to push the slider 4 downward. At the same time, the firing pin 11 can push the slider 4 downward more stably.
[0062] Reference Figure 5 It is a top view of the first embodiment of the slider. As a further optimization scheme, in this embodiment, a cross-shaped connecting frame 41 is provided at the end of the through hole away from the flap 3. The cross-shaped connecting frame 41 is perpendicular to the center line of the through hole, and the end of the cross-shaped connecting frame 41 is fixedly connected to the inner wall of the through hole.
[0063] In this embodiment, the cross-shaped connecting frame 41 is used to further improve the stability of the striker 11 pushing the slider 4 to move downward.
[0064] Reference Fig.18 It is a partial cross-sectional view of the grouting pipe. As a further optimization scheme, in this embodiment, a chamfer is provided on the inner side of one end of the socket pipe 2 close to the wellhead, and a straightening wing 12 is fixed on the outer side of the grouting pipe, and the straightening wing 12 is connected with the chamfer.
[0065] In this embodiment, the righting wing 12 cooperates with the chamfer on the inner side of the socket tube 2 so that when the grouting tube moves downward to the chamfer, the striker completely pushes the slider 4 out of the socket tube 2 .
[0066] As a further optimization scheme, the present embodiment also includes a guide shoe 5 and an outer sleeve 6. The outer sleeve 6 is fixedly mounted on the outside of the socket tube 2. The outer sleeve 6 is fixedly and sealedly connected to the inner wall of the sleeve. The guide shoe 5 is fixed at one end of the outer sleeve 6 away from the wellhead.
[0067] Reference Figure 2 This is a front view of the socket tube of this embodiment. A plurality of limiting structures are arranged on the outside of the socket tube 2, such as an annular protrusion and an annular groove. Fig.13 This is a cross-sectional view of the outer sleeve of this embodiment. A limiting structure is correspondingly provided on the inner wall of the outer sleeve 6 so that the socket tube 2 and the outer sleeve 6 are fixedly and sealedly connected.
[0068] In this embodiment, the socket tube 2 is connected to the guide shoe 5 through the outer sleeve 6, so that the socket tube 2 can be smoothly guided down to the bottom of the well. Fig.14 It is an enlarged schematic diagram of point A on the outer sleeve. At the same time, a thread is provided on the inner wall of the outer sleeve 6 away from the guide shoe 5 to facilitate connection with the installation equipment.
[0069] As a further optimization solution, in this embodiment, the interior of the guide shoe 5 is hollow and connected to the outer sleeve 6. A plurality of slurry outlet holes 50 are arranged around the guide shoe 5, and the slurry outlet holes 50 are connected to the interior of the guide shoe 5.
[0070] In this embodiment, the interior of the guide shoe 5 is hollow, and in particular, one end of the guide shoe 5 connected to the outer sleeve 6 is configured to be tubular, and the guide shoe 5 and the outer sleeve 6 are welded and fixed.
[0071] Reference Fig.15 The cross-sectional view of the guide shoe of this embodiment, the guide shoe 5 comprises a guide shoe connector 51 and a guide shoe head 52, Fig.16 The cross-sectional view of the guide shoe connector of this embodiment, the two ends of the guide shoe connector 51 are respectively provided with mounting interfaces, refer to Fig.17 This is a cross-sectional view of the guide shoe head portion of this embodiment. An installation interface is also provided at the end of the guide shoe head portion 52. The guide shoe head portion 52 is connected to one end of the guide shoe connector 51 by using the installation interface and then welded and fixed. The other end of the guide shoe connector 51 is connected to the outer sleeve 6 by using the installation interface and then welded and fixed.
[0072] The grouting equipment of the utility model can carry out grouting before well completion. During the well completion operation, the striker carried by the front of the grouting pipe can knock off the slider by its own pressure, so that the positive injection and reverse sealing can be achieved and the bottom of the well can be completely sealed. After the well completion operation, the grouting pipe can be pulled out immediately without waiting for the cement slurry to solidify, thereby effectively improving the work efficiency (avoiding the situation in the prior art where, due to the low specific gravity of the cement slurry, it is necessary to wait for 8 hours before the next operation can be carried out to ensure the solidification quality of the cement ring glue, which reduces the construction efficiency) to avoid the bursting of low-pressure casing and reduce the risk of grouting in mines. The striker is detachable and replaceable when damaged, and can be used for conventional well types. It can also be used for special well types that cannot withstand large displacement and high pressure but need to realize self-grouting. The striker is pushed by the dead weight of the grouting pipe to knock open the float valve, thereby realizing a well completion tool with a single-flow function.
[0073] The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. A self-filling intubation grouting completion tool, which is connected to the casing in the wellbore, and the grouting pipe is grouted into the wellbore through the casing to seal the casing, characterized in that: include: A socket tube (2) is coaxially arranged in the sleeve, and the socket tube (2) is fixedly and hermetically connected to the inner wall of the sleeve; A slider (4) is arranged in the socket tube (2), the slider (4) abuts against the inner wall of the socket tube (2), a through hole is opened on the slider (4) along the center line direction of the socket tube (2), and cement slurry is injected into the wellbore through the through hole; A flap (3) is hinged to one end of the socket tube (2) close to the bottom of the well, and the flap (3) abuts against one end of the slider (4); An elastic member, arranged on the hinge shaft of the flap (3), and used for driving the flap (3) to flip toward a side close to the socket tube (2); The striker (11) is fixedly mounted on the end of the grouting pipe. The striker (11) pushes the slider (4) to move downward and slide out of the socket pipe (2), so that the flap (3) is buckled on the socket pipe (2) to seal it.
2. The self-priming intubation grouting completion tool according to claim 1 is characterized in that: A limiting hole (20) is provided on one side of the socket tube (2) along its radial direction, a stop pin (21) is inserted into the limiting hole (20), and the stop pin (21) is slidably connected to the limiting hole (20) along its center line direction. An annular limiting groove (40) is provided on the outer side of the slider (4) around its circumference, and one end of the stop pin (21) extends into the annular limiting groove (40) and abuts against it.
3. The self-priming intubation grouting completion tool according to claim 1, characterized in that: A first annular step is provided on the inner wall of the socket tube (2) and is coaxial with the center line thereof. The first annular step is located at one end of the socket tube (2) close to the bottom of the well. An arc-shaped protrusion is fixedly provided on the outer side of the slider (4) and is coaxial with the center line of the socket tube (2). The arc-shaped protrusion abuts against the first annular step. When the slider (4) slides out of the socket tube (2), the flap (3) is buckled on the first annular step and abuts against it.
4. The self-filling intubation grouting completion tool according to claim 3 is characterized in that: An O-ring (22) is fixedly arranged on the first annular step, the arc-shaped protrusion abuts against the O-ring (22), and the flap (3) abuts against the O-ring (22) when it is buckled.
5. The self-priming intubation grouting completion tool according to claim 1, characterized in that: A second annular step is provided on one side of the socket pipe (2) close to the wellhead, a plug pipe (1) is fixedly provided at the end of the grouting pipe and is coaxial with the center line of the grouting pipe, the plug pipe (1) is cooperatively connected to the second annular step, and one end of the striker (11) is fixedly connected to the plug pipe (1) and is parallel to the center line of the plug pipe (1).
6. The self-priming intubation grouting completion tool according to claim 5, characterized in that: The striker (11) is in the form of a tube, which is coaxial with the center line of the plug tube (1) and is detachably fixedly connected to the plug tube (1).
7. The self-priming intubation grouting completion tool according to claim 1, characterized in that: A cross-shaped connecting frame (41) is provided at one end of the through hole away from the flap (3), the cross-shaped connecting frame (41) is perpendicular to the center line of the through hole, and the end of the cross-shaped connecting frame (41) is fixedly connected to the inner wall of the through hole.
8. The self-priming intubation grouting completion tool according to claim 1, characterized in that: A chamfer is provided on the inner side of one end of the socket pipe (2) close to the wellhead, and a centralizing wing (12) is fixedly provided on the outer side of the grouting pipe, and the centralizing wing (12) is connected in a matching manner with the chamfer.
9. The self-filling intubation grouting completion tool according to claim 1, characterized in that: Also includes: A guide shoe (5) and an outer sleeve (6), wherein the outer sleeve (6) is fixedly sleeved on the outside of the socket tube (2), the outer sleeve (6) is fixedly and sealedly connected to the inner wall of the sleeve, and the guide shoe (5) is fixed to one end of the outer sleeve (6) away from the wellhead.
10. The self-filling intubation grouting completion tool according to claim 9, characterized in that: The interior of the guide shoe (5) is hollow and communicated with the outer sleeve (6). A plurality of slurry outlet holes (50) are arranged around the guide shoe (5), and the slurry outlet holes (50) are communicated with the interior of the guide shoe (5).