Cement paste filling type well completion device
By designing the structure of grouting pipe and columnar blocks in the filling pipe, the cement slurry is prevented from flowing back, and the problems of interlayer squirting and filling pipe cleaning are solved, and the wellbore stability and production efficiency are improved.
Patent Information
- Application Number
- CN202421196326.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-29
AI Technical Summary
In oil well production, interlayer traversal causes water to enter the oil layer, affecting the oil well production and oil quality. The existing cement slurry filling method can easily lead to the need to be cleaned after the cement slurry in the filling pipe solidifies, which is time-consuming and labor-intensive and easy to damage the filling pipe.
A cement slurry filling-type well completion device was designed. The filling pipe was fitted with a grouting pipe, and a columnar block and groove were fixed at the bottom. The grouting pipe was connected to the groove, and the cement slurry was discharged through the slurry hole, and the completion was completed. Automatically block the cement slurry to prevent backflow and eliminate cleaning steps.
Effectively prevent cement slurry from entering the filling pipe, save manpower and material resources, improve the stability and safety of the wellbore, and simplify the construction process.
Smart Images
Figure CN222333750U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of well completion devices, in particular to a cement slurry filling type well completion device. Background Art
[0002] For oil fields with multiple reservoir types and large interlayer differences, interlayer channeling is an important problem that plagues the middle and late stages of oil well production. Interlayer channeling is the unexpected flow of fluid between the oil layer and the water layer due to the pressure difference between the oil layer and the water layer during the production of the oil well. That is, the water in the water layer enters the oil layer through cracks, faults or pores, affecting the production and quality of the oil well, reducing the production efficiency of the oil well and shortening the service life of the oil well. Filling the annular space outside the casing with cement slurry can seal the water layer to prevent interlayer channeling problems, and can also reinforce the wellbore, improve the stability and safety of the wellbore, and ensure that subsequent oil and gas production operations can proceed smoothly.
[0003] At present, the most commonly used filling method is to inject grout directly from the filling pipe. Although the construction is simple and the cost is low, when the annular space outside the pipe is filled with cement slurry, a large amount of cement slurry will be filled in the filling pipe. After the cement slurry solidifies, the cement slurry in the filling pipe needs to be cleared out by drilling the hole. This is not only labor-intensive and material-intensive, but also easy to damage the inner wall of the filling pipe when the drilling rig is sweeping the hole.
[0004] Based on the above problems, the utility model provides a cement slurry filling completion device, which can prevent cement slurry from entering the filling pipe, thereby eliminating the subsequent step of cleaning the cement slurry in the filling pipe, effectively saving manpower and material resources. Summary of the invention
[0005] The technical problem to be solved by the utility model is to design a cement slurry filling type well completion device, which can prevent cement slurry from flowing into the filling pipe during grouting.
[0006] In order to solve the above technical problems, the cement slurry filling completion device of the utility model includes a filling pipe, and its structural feature is that a grouting pipe is sleeved inside the filling pipe, a columnar block is coaxially fixed at the bottom of the filling pipe, a groove with an upward opening is provided in the columnar block, and a grouting hole connected to the groove is provided near the top of the columnar block. The grouting pipe is detachably connected to the support seat, the interior of the grouting pipe is connected to the groove, and a blocking component for isolating the grouting pipe and the grouting hole is provided in the groove.
[0007] With the above structure, the cement slurry discharged from the grouting pipe will squeeze the blocking component downward and enter the groove above the blocking component, and the cement slurry will be discharged through the slurry discharge hole. When the cement slurry is not discharged, the blocking component can cover the slurry discharge hole, and the groove can be in a sealed state.
[0008] Preferably, the upper surface of the columnar block is fixedly connected to a support seat, the upper surface of the support seat is fixedly connected to a positioning sleeve, the grouting pipe is sleeved outside the positioning sleeve, and a first through hole connecting the groove and the positioning sleeve is opened inside the support seat. The cement slurry discharged from the grouting pipe passes through the positioning sleeve and the first through hole in the support seat in turn to squeeze the blocking component downward, so that the cement discharge process is more stable.
[0009] Preferably, the blocking assembly includes a blocking member slidably connected inside the groove, the bottom surface of the blocking member is fixedly connected to the upper ends of a group of springs distributed in a circular array, and the lower end of the spring is fixedly connected to the bottom wall of the groove. During grouting, the cement slurry will press the blocking member to move downward, and the blocking member will compress the spring when it moves downward.
[0010] Preferably, the blocking member is cylindrical, and the diameter of the blocking member is adapted to the inner diameter of the groove. The blocking member and the groove are clearance-matched, which can prevent cement slurry from falling between the blocking member and the bottom wall of the groove without affecting the up and down sliding of the blocking member.
[0011] Preferably, the outer wall of the positioning sleeve is interference fit with the inner wall of the grouting pipe, and the support seat and the positioning sleeve are used to support and position the grouting pipe, which facilitates the installation of the grouting pipe and can improve the stability of the grouting pipe during use.
[0012] Preferably, a limiting rod is fixedly connected at the center position of the bottom surface of the blocking member. By setting the limiting rod, the maximum distance that the blocking member can move downward can be limited. When the limiting rod moves downward to contact the bottom wall of the groove, the top of the blocking member is flush with the bottom wall of the slurry discharge hole, and at the same time, the damage to the spring can be reduced.
[0013] Preferably, a cover plate is provided above the filling pipe, and a second through hole compatible with the grouting pipe is opened on the cover plate. The grouting pipe extends downward into the filling pipe through the second through hole. When installing the grouting pipe, the cover plate can be firstly put on the grouting pipe to facilitate the subsequent connection between the grouting pipe and the positioning sleeve.
[0014] Preferably, a plurality of positioning bosses are fixedly mounted on the upper end of the filling tube, and positioning holes matching the positioning bosses are opened on the cover plate, and the positioning bosses can be snapped into the inside of the positioning holes. The arrangement of the positioning bosses and the positioning holes facilitates the connection between the grouting tube and the positioning sleeve.
[0015] Preferably, a plurality of the slurry discharge holes are provided, and the plurality of slurry discharge holes are distributed in a circular array along the circumference of the columnar block. The provision of the slurry discharge holes facilitates and quickly discharges cement slurry into the annular space between the filling pipe and the wellbore.
[0016] Preferably, the lower end of the grouting pipe is a trumpet-shaped opening, and the trumpet-shaped opening facilitates the plugging and connection between the grouting pipe and the positioning sleeve.
[0017] To sum up, the beneficial effect of the utility model is that when using this scheme for grouting, the cement slurry is discharged from the slurry discharge hole into the annular space between the filling pipe and the wellbore, and after the filling is completed, the slurry discharge hole can be automatically blocked to make the groove in a sealed state, thereby preventing cement slurry from entering the filling pipe, thereby eliminating the subsequent step of cleaning the cement slurry in the filling pipe, and effectively saving manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:
[0019] Figure 1 This is a schematic diagram of the overall structure of a cement slurry filling type well completion device of the utility model;
[0020] Figure 2 This is a schematic diagram of the connection between a filling pipe and a columnar block of a cement slurry filling type well completion device of the utility model;
[0021] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part A in the middle.
[0022] In the figure: 1. filling pipe; 2. columnar block; 3. grouting pipe; 4. groove; 5. support seat; 6. positioning sleeve; 7. slurry discharge hole; 8. blocking member; 9. spring; 10. cover plate; 11. positioning hole; 12. positioning boss; 13. second through hole; 14. limit rod; 15. first through hole. DETAILED DESCRIPTION
[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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 application.
[0025] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0027] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.
[0028] Refer to the attached Figure 1 The utility model discloses a cement slurry filling completion device, which structure includes a filling pipe 1, a grouting pipe 3 is sleeved in the filling pipe 1, the lower end of the grouting pipe 3 is a trumpet-shaped opening, a columnar block 2 is coaxially fixed to the bottom of the filling pipe 1, a groove 4 with an upward opening is provided in the columnar block 2, and a slurry discharge hole 7 connected with the groove 4 is provided near the top of the columnar block 2. Preferably, a plurality of slurry discharge holes 7 are provided, and the plurality of slurry discharge holes 7 are distributed in a circular array around the columnar block 2. The grouting pipe 3 is detachably connected to the support seat 5, the interior of the grouting pipe 3 is connected with the groove 4, and a blocking component for isolating the grouting pipe 3 and the slurry discharge hole 7 is provided in the groove 4.
[0029] As a further explanation of this embodiment, refer to the attached Figure 1 A support seat 5 is fixedly connected to the upper surface of the columnar block 2, and a positioning sleeve 6 is fixedly connected to the upper surface of the support seat 5. The height of the positioning sleeve 6 is higher than the height of the trumpet-shaped opening. The grouting pipe 3 is sleeved outside the positioning sleeve 6, and a first through hole 15 connecting the groove 4 and the positioning sleeve 6 is opened inside the support seat 5.
[0030] Specifically, there are four slurry discharge holes 7. The cement slurry discharged from the grouting pipe 3 will pass through the positioning sleeve 6 and the first through hole 15 in sequence, and then squeeze the blocking component downward and enter the groove 4 above the blocking component. The cement slurry will be discharged through the slurry discharge holes 7. When the cement slurry is not discharged, the blocking member 8 can block the slurry discharge holes 7, and the groove 4 can be in a sealed state.
[0031] As a further explanation of this embodiment, refer to the attached Figure 1The blocking assembly includes a blocking member 8 slidably connected to the inside of the groove 4, the bottom surface of the blocking member 8 is fixedly connected to the upper ends of a group of springs 9 distributed in a circular array, and the lower end of the spring 9 is fixedly connected to the bottom wall of the groove 4. Preferably, the number of springs 9 is four. During grouting, the cement slurry will press the blocking member 8 to move downward, and the blocking member 8 will compress the spring 9 when it moves downward.
[0032] As a further explanation of this embodiment, refer to the attached Figure 1 The blocking member 8 is cylindrical, and the diameter of the blocking member 8 is adapted to the inner diameter of the groove 4. The blocking member 8 and the groove 4 are clearance-matched, which can prevent cement slurry from falling between the blocking member 8 and the bottom wall of the groove 4 without affecting the up and down sliding of the blocking member 8.
[0033] As a further explanation of this embodiment, refer to the attached Figure 1 The outer wall of the positioning sleeve 6 is interference fit with the inner wall of the grouting pipe 3. The support seat 5 and the positioning sleeve 6 are used to support and position the grouting pipe 3, which facilitates the installation of the grouting pipe 3 and improves the stability of the grouting pipe 3 during use.
[0034] As a further explanation of this embodiment, refer to the attached Figure 1 A limiting rod 14 is fixedly connected at the center position of the bottom surface of the blocking member 8. By setting the limiting rod 14, the maximum distance that the blocking member 8 can move downward can be limited. When the limiting rod 14 moves downward to contact the bottom wall of the groove 4, the top of the blocking member 8 is flush with the bottom wall of the slurry discharge hole 7.
[0035] As a further explanation of this embodiment, refer to the attached Figure 1 and attached Figure 2 A cover plate 10 is arranged above the filling pipe 1, and a second through hole 13 adapted to the grouting pipe 3 is opened on the cover plate 10. The grouting pipe 3 extends downward into the filling pipe 1 through the second through hole 13. When installing the grouting pipe 3, the cover plate 10 can be firstly sleeved onto the grouting pipe 3.
[0036] As a further explanation of this embodiment, refer to the attached Figure 1 and attached Figure 3 A plurality of positioning bosses 12 are fixedly installed on the upper end of the filling tube 1, and a positioning hole 11 matched with the positioning boss 12 is opened on the cover plate 10, and the positioning boss 12 can be engaged in the inside of the positioning hole 11. After the cover plate 10 is sleeved on the grouting tube 3, the positioning boss 12 is engaged in the inside of the positioning hole 11. At this time, when the grouting tube 3 is moved downward, the grouting tube 3 can be accurately plugged into the positioning sleeve 6.
[0037] Working principle of the utility model: in this device, except for the grouting pipe 3, other structures are filling auxiliary mechanisms. When filling the wellbore, first lower the filling auxiliary mechanism to the designed depth to ensure that the cement slurry is poured from the bottom and gradually rises until it is full. The cover plate 10 is sleeved on the grouting pipe 3 and the positioning boss 12 on the filling pipe 1 is engaged with the positioning hole 11 on the cover plate 10. Then, the grouting pipe 3 is continuously transported into the filling pipe 1 so that the grouting pipe 3 and the positioning sleeve 6 are plugged in and the inner wall of the grouting pipe 3 and the outer wall of the positioning sleeve 6 are interference fit. The grouting pipe 3 is detachably connected to the support seat 5, and then cement slurry can be transported through the grouting pipe 3, and pressure is applied to the cement slurry so that the cement slurry passes through the positioning sleeve 6 and the support seat 5 in turn. The first through hole 15 on the upper surface enters into the interior of the groove 4, that is, the part inside the groove 4 and above the blocking member 8. The cement slurry will press the blocking member 8 to move downward. The downward movement of the blocking member 8 will compress the spring 9 and leak out the slurry discharge hole 7 on the columnar block 2, so that the cement slurry will be discharged from the slurry discharge hole 7 into the annular space between the filling pipe 1 and the wellbore until the annular space is filled. Then the injection of cement slurry is stopped. After the cement slurry is filled, the grouting pipe 3 is taken out. At this time, under the action of the spring 9, the blocking member 8 will move upward to block the slurry discharge hole 7, thereby preventing the external cement slurry from backflowing, thereby preventing the filling pipe 1 from entering the cement slurry, eliminating the subsequent step of cleaning the cement slurry in the filling pipe 1, and effectively saving manpower and material resources.
[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, multiple improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. A cement slurry filling completion device, comprising a filling pipe (1), characterized in that The filling pipe (1) is sleeved with a grouting pipe (3), a columnar block (2) is coaxially fixed at the bottom of the filling pipe (1), a groove (4) with an opening facing upward is provided in the columnar block (2), a grouting hole (7) communicating with the groove (4) is provided near the top of the columnar block (2), the grouting pipe (3) is detachably connected to the support seat (5), the interior of the grouting pipe (3) is communicated with the groove (4), and a blocking component for isolating the grouting pipe (3) and the grouting hole (7) is provided in the groove (4); The blocking assembly comprises a blocking member (8) slidably connected inside the groove (4), the bottom surface of the blocking member (8) being fixedly connected to the upper ends of a group of springs (9) distributed in a circular array, and the lower ends of the springs (9) being fixedly connected to the bottom wall of the groove (4); The blocking member (8) is cylindrical, and the diameter of the blocking member (8) matches the inner diameter of the groove (4). A limiting rod (14) is fixedly connected to the center position of the bottom surface of the blocking member (8).
2. The cement slurry filling completion device according to claim 1, characterized in that The upper surface of the columnar block (2) is fixedly connected to a support seat (5), the upper surface of the support seat (5) is fixedly connected to a positioning sleeve (6), the grouting pipe (3) is sleeved outside the positioning sleeve (6), and a first through hole (15) connecting the groove (4) and the positioning sleeve (6) is provided inside the support seat (5).
3. The cement slurry filling completion device according to claim 2, characterized in that The outer wall of the positioning sleeve (6) is interference-fitted with the inner wall of the grouting pipe (3).
4. The cement slurry filling completion device according to claim 1, characterized in that A cover plate (10) is arranged above the filling pipe (1), and a second through hole (13) adapted to the grouting pipe (3) is provided on the cover plate (10), and the grouting pipe (3) passes through the second through hole (13) and extends downward into the filling pipe (1).
5. The cement slurry filling completion device according to claim 4, characterized in that A plurality of positioning bosses (12) are fixedly mounted on the upper end of the filling tube (1), and a positioning hole (11) matching the positioning bosses (12) is provided on the cover plate (10), and the positioning bosses (12) can be engaged inside the positioning holes (11).
6. The cement slurry filling completion device according to claim 1, characterized in that A plurality of the slurry discharge holes (7) are provided, and the plurality of slurry discharge holes (7) are distributed in a circular array along the circumference of the columnar block (2).
7. The cement slurry filling completion device according to claim 1, characterized in that The lower end of the grouting pipe (3) is a trumpet-shaped opening.