A downhole sand control screen with multi-layer filtering function
By adopting a multi-layer filter structure in the underground sandproof screen pipe and using the combination of filter sleeve and filter line net, the problem of easy blockage of existing sandproof screen pipes is solved, achieving more efficient sand gravel filtration and improving production efficiency.
Patent Information
- Application Number
- CN202421680665.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The existing sandproof screen pipes only have one layer of screen mesh, the hole diameters of the screen holes are the same and fine, and are prone to clogging, affecting the transportation efficiency of oil, gas and water.
A downhole sandproof screen tube with multi-layer filtration function is designed, and a combined structure of a filter sleeve and a filter line net is adopted. The filter line net is used to filter sand with larger particle sizes, and the filter sleeve is used to filter more fine sand with larger gravel and realize layered filtration.
Through the multi-layer filter structure, blockage is avoided, the fineness of sand prevention is improved, the efficiency of oil, gas and water is enhanced, and the service life of underground equipment is extended.
Smart Images
Figure CN222716887U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground sand prevention, in particular to an underground sand prevention screen pipe with a multi-layer filtering function. Background Art
[0002] Downhole sand control screens are also called downhole water filter pipes. They can be used in the oil, gas and water well sand control industries. They are one of the core components of mechanical sand control technology and have a great impact on the sand control effect, cost and production of oil and gas wells. Their function is to prevent bottom sediments and impurities from entering the wellbore, thereby protecting downhole equipment and extending the service life of oil and gas wells.
[0003] The current sand control screen has only one layer of screen. In order to improve the fineness of sand control, the screen holes of the single layer of screen are very fine, but the particle sizes of gravel are different. Gravel with larger particle sizes can easily clog the screen holes, which will affect the transportation efficiency of oil, gas and water, thereby affecting production efficiency. Utility Model Content
[0004] 1. Technical issues to be solved
[0005] The technical problem to be solved by the utility model is that the current sand control screen pipe has only one layer of screen mesh, and the screen holes have the same fine apertures, which are prone to clogging and will affect production efficiency.
[0006] (II) Technical solution
[0007] In order to solve the above technical problems, the technical solution provided by the utility model is: a downhole sand control screen with a multi-layer filtering function, comprising a base pipe, a shell is provided at one end of the base pipe, an annular mounting cavity is provided between the outer wall of the base pipe and the inner wall of the shell, a second connecting hole and a first connecting hole that cooperate with each other are respectively provided in the base pipe and the shell, a filter sleeve is slidably sleeved on the base pipe, the filter sleeve cooperates with the first connecting hole and the second connecting hole, an annular mounting plate that cooperates with the annular mounting cavity is slidably sleeved on the filter sleeve, the annular mounting plate cooperates with the first connecting hole and the second connecting hole, the filter sleeve is provided with at least one sieve hole evenly arranged in a ring shape, and a filter wire mesh that cooperates with the sieve hole is fixedly connected to one side of the annular mounting plate.
[0008] As an improvement, the annular mounting plate and the filter sleeve are both provided with mounting holes that match the first connecting hole and the second connecting hole.
[0009] As an improvement, the filter wire mesh is composed of spirally wound steel bars, and the pitch is greater than the inner diameter of the sieve hole.
[0010] As an improvement, a sealing gasket that cooperates with the annular mounting plate and the filter sleeve is adhered to the inner wall of the annular mounting cavity.
[0011] As an improvement, a gasket cooperating with the bolt is adhered to the shell around the first connecting hole.
[0012] (III) Beneficial effects
[0013] The advantage of the utility model over the prior art is that any or all of the filter sleeve and the filter wire net can be installed in the annular installation cavity between the base tube and the shell by using the connection hole one and the connection hole two. The filter wire net has the advantages of strong corrosion resistance, high mechanical strength and simple maintenance to first filter the larger particle size of gravel on the outside, and then use the finer aperture on the filter sleeve to filter the gravel. The gravel can be filtered in layers, which has a better effect of avoiding clogging. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of a downhole sand control screen pipe with multi-layer filtering function without filtering sleeve and filtering wire net. Figure 1 .
[0015] Figure 2 This is a schematic diagram of the structure of a downhole sand control screen pipe with multi-layer filtering function without filtering sleeve and filtering wire net. Figure 2 .
[0016] Figure 3 The utility model is a structural schematic diagram of a downhole sand control screen pipe with multi-layer filtering function without a filtering wire mesh.
[0017] Figure 4 The utility model is a structural schematic diagram of a filter wire net of an underground sand control screen pipe with a multi-layer filtering function.
[0018] Figure 5 The utility model is an assembly state diagram of an underground sand prevention screen pipe with a multi-layer filtering function.
[0019] As shown in the figure: 1. Base pipe; 2. Outer shell; 3. Annular mounting cavity; 4. Connection hole 1; 5. Connection hole 2; 6. Filter sleeve; 7. Sieve hole; 8. Filter wire mesh; 9. Annular mounting plate. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0021] Embodiment 1
[0022] like Figure 1 , Figure 2 and Figure 3 As shown, a downhole sand control screen with a multi-layer filtering function comprises a base pipe 1, one end of the base pipe 1 is provided with a shell 2, an annular mounting cavity 3 is provided between the outer wall of the base pipe 1 and the inner wall of the shell 2, a connecting hole 2 5 and a connecting hole 1 4 which cooperate with each other are respectively provided in the base pipe 1 and the shell 2, a filtering sleeve 6 is slidably sleeved on the base pipe 1, and the filtering sleeve 6 cooperates with the connecting hole 1 4 and the connecting hole 2 5.
[0023] Through the above structure, the filter sleeve 6 can be installed around the base pipe 1. The specific structure of how to install the filter wire mesh 8 is as follows:
[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an annular mounting plate 9 cooperating with the annular mounting cavity 3 is slidably sleeved on the filter sleeve 6, and the annular mounting plate 9 cooperates with the connecting hole 1 4 and the connecting hole 2 5. The filter sleeve 6 is provided with at least one sieve hole 7 evenly arranged in an annular shape, and a filter wire mesh 8 cooperating with the sieve hole 7 is fixedly connected to one side of the annular mounting plate 9. The annular mounting plate 9 and the filter sleeve 6 are both provided with mounting holes cooperating with the connecting hole 1 4 and the connecting hole 2 5. The filter wire mesh 8 is composed of a spirally wound steel bar, and the pitch is greater than the inner diameter of the sieve hole 7. A sealing gasket cooperating with the annular mounting plate 9 and the filter sleeve 6 is adhered to the inner wall of the annular mounting cavity 3.
[0025] Through the above structure, the filter wire net 8 can be installed and cooperated with the filter sleeve 6 to play the role of layered filtering.
[0026] Embodiment 2
[0027] like Figure 4 As shown, a gasket cooperating with the bolt is adhered to the shell 2 around the connecting hole 1 4 .
[0028] With the above structure, the stability when tightening the bolt can be improved.
[0029] When the utility model is implemented, when it is needed to be used, when installing the filter sleeve, it is sleeved on the base pipe and slid until it extends into the annular installation cavity, and then the aligned connection hole 1, connection hole 2 and the installation hole on the filter sleeve are threadedly connected together by bolts, and the installation of the filter sleeve is completed;
[0030] When the filter mesh needs to be installed, before connecting the bolts on the filter sleeve, put it on the filter sleeve and slide it until the annular mounting plate extends into the annular mounting cavity. When the mounting holes on the filter sleeve and the annular mounting plate are aligned with the connecting holes one and two, use bolts to thread the mounting holes with the connecting holes one and two, and the filter sleeve and the filter mesh are completed. At this time, the filter mesh can filter gravel with larger particle sizes, and the sieve holes on the filter sleeve can filter finer gravel. This can achieve double-layer graded filtration to avoid serious blockage that affects production efficiency.
[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
[0033] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.
Claims
1. A downhole sand control screen with multi-layer filtering function, characterized in that: The invention comprises a base tube (1), one end of which is provided with a shell (2), an annular installation cavity (3) is provided between the outer wall of the base tube (1) and the inner wall of the shell (2), a second connecting hole (5) and a first connecting hole (4) which cooperate with each other are provided in the base tube (1) and the shell (2), a filter sleeve (6) is slidably sleeved on the base tube (1), and the filter sleeve (6) cooperates with the first connecting hole (4) and the second connecting hole (5); The filter sleeve (6) is slidably sleeved with an annular mounting plate (9) that cooperates with the annular mounting cavity (3); the annular mounting plate (9) cooperates with the connecting hole 1 (4) and the connecting hole 2 (5); the filter sleeve (6) is provided with at least one sieve hole (7) that is evenly arranged in an annular shape; one side of the annular mounting plate (9) is fixedly connected with a filter wire net (8) that cooperates with the sieve hole (7).
2. The downhole sand control screen with multi-layer filtering function according to claim 1, characterized in that: The annular mounting plate (9) and the filter sleeve (6) are both provided with mounting holes that match the first connecting hole (4) and the second connecting hole (5).
3. The downhole sand control screen with multi-layer filtering function according to claim 1, characterized in that: The filter wire mesh (8) is composed of steel bars wound in a spiral shape, and the pitch of the spiral is greater than the inner diameter of the sieve hole (7).
4. The downhole sand control screen with multi-layer filtering function according to claim 1, characterized in that: A sealing gasket that cooperates with the annular mounting plate (9) and the filter sleeve (6) is adhered to the inner wall of the annular mounting cavity (3).
5. The downhole sand control screen with multi-layer filtering function according to claim 2, characterized in that: A gasket matching the bolt is adhered to the outer shell (2) around the connection hole 1 (4).