Winding filter
By designing the tapered contour structure of supporting components and windings and boron treatment technology, the existing winding filters are easily blocked, deformed and corroded, and a stronger and more durable filter is achieved, extending the service life and Improved filtering performance.
Patent Information
- Application Number
- CN202380038756.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-06
- Filing Date
- 2023-05-05
- Publication Date
- 2024-12-20
AI Technical Summary
Existing winding filters for filtering crude oil, natural gas and water are prone to clogging, deforming, corroding or eroding, and have a short service life.
The cross-sectional profile of the supporting element gradually becomes smaller in the radial direction and is not in contact. It is composed of at least boron-treated steel. The minimum distance of the winding filter is between 1 μm and 50 mm. The supporting element and winding are connected by welding technology. and boron treatment at high temperatures to enhance material hardness.
It significantly improves the robustness and corrosion resistance of the winding filter, extends the service life, reduces the frequency of clogging, and improves the filtering performance.
Smart Images
Figure CN119173318A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a wound wire filter for filtering crude oil, natural gas or water according to claim 1 and to a method for producing a wound wire filter according to claim 10 . Background Art
[0002] Filters for filtering crude oil, natural gas and water from reservoirs are known. In known filters, clogging of the filter, deformation of the filter, corrosion or erosion of the filter may occur. Therefore, there is a need to improve such filters and increase the service life of the filter. Summary of the invention
[0003] It is therefore an object of the present invention to provide an improved wire wound filter and method for manufacturing a wire wound filter and to provide a wire wound filter which is more robust and has a longer service life in use.
[0004] This object is achieved by the features of claims 1 and 10 .
[0005] The invention advantageously provides that the cross-sectional profiles of the support elements each taper outwardly in a radial direction and that the support elements are arranged relative to one another such that they do not touch, wherein at least the support structure and at least one winding consist of boron-treated steel.
[0006] The invention has the advantage that the wire wound filter is significantly more robust and shows less signs of corrosion and less signs of erosion in use. Furthermore, the wire wound filter has a better filtering performance, whereby clogging of the filter is less frequent in use. Since the wire wound filter consists of boron-treated steel and the boron penetrates into the material of the wire wound filter during boronizing, the boron does not separate in use. The overall surface hardness is also improved.
[0007] The cross-sectional profile of the at least one winding wire may taper inwardly in a radial direction.
[0008] At least for 50% of the surface of the wound filter, the minimum distance between two wound windings can be between 1 μm and 50 mm. The minimum distance can also be referred to as the slot width. The size of the minimum distance depends on the particle size of the surrounding area of the medium to be filtered.
[0009] In this way, crude oil, natural gas and water can be filtered in an optimal manner.
[0010] The minimum distance between two adjacent support elements may be greater than the minimum distance between two wound windings.
[0011] Internal perforated ducting may be arranged inside the support structure.
[0012] Within the support structure, the provided pipes may also be boron-treated or consist of boron-treated steel.
[0013] The outer diameter of the wire wound filter can be between 30 mm and 300 mm.
[0014] The wire wound filter may be connected, preferably welded, to an end ring at at least one of its two ends.
[0015] The support element and the wire windings may be made of stainless steel.
[0016] Furthermore, according to the present invention, there is provided a method for manufacturing a wire wound filter, the method comprising the following steps:
[0017] - providing support elements made of steel, each of which has a respective conically tapering cross-sectional profile,
[0018] - arranging the support elements so that the arranged support elements form the shape of a tubular support structure, and the cross-sectional profiles of the support elements each taper outwardly in a radial direction, the support elements being spaced apart from each other and not in contact,
[0019] - using a holding device to hold the support element in the arranged shape,
[0020] - providing at least one winding wire consisting of steel,
[0021] - winding the winding wire on the arranged support element held by the holding device,
[0022] -Connect the windings to the supporting element using welding techniques,
[0023] - remove the retaining device,
[0024] - Boron treatment of wire wound filters.
[0025] Boron treatment may include the following steps:
[0026] - placing the support element and the winding wire connected to the support element into a closed furnace,
[0027] - Heating in the presence of a boriding agent.
[0028] During heating, the furnace may be heated to a temperature of 750°C to 950°C.
[0029] The at least one winding may be manufactured such that a cross-sectional profile of the at least one winding tapers inwardly in a radial direction.
[0030] At least one wire can be wound on the support element such that for at least 50% of the surface of the wire wound filter the minimum distance between two wire windings is between 1 μm and 50 mm, preferably between 100 μm and 300 μm.
[0031] The support elements may preferably be arranged relative to one another and the winding wire may be wound onto the support elements such that a minimum distance between adjacent support elements is greater than a minimum distance between two winding wire windings. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.
[0033] The accompanying drawings schematically show:
[0034] Figure 1 A wire wound filter with a connecting element according to the invention,
[0035] Figure 2 is a wire wound filter according to the present invention,
[0036] Figure 3 yes Figure 1 Detail showing the end of the wire wound filter,
[0037] Figure 4 yes Figure 1 Cross-sectional view of a wire wound filter,
[0038] Figure 5 yes Figure 1 Details of the longitudinal section,
[0039] Figure 6 is the cross section of the supporting element and the winding,
[0040] Figure 7 is a surface analysis prior to corrosion testing,
[0041] Figure 8 Surface analysis after 2 hours of corrosion testing,
[0042] Fig. 9 It is the surface analysis after 48 hours of corrosion test.
[0043] Fig.10 is a macroscopic image after 48 hours of corrosion testing. DETAILED DESCRIPTION
[0044] Figure 1 A wire wound filter 1 with a connecting element 2 is shown. An end ring 4 is provided at the end of the wire wound filter 1. The wire wound filters can be used to filter reservoirs of crude oil, natural gas or water. For this purpose, they can be connected to a connecting element 2.
[0045] In an alternative embodiment not shown, the outer diameter of the wire wound filter can also be adapted to the outer diameter of the connecting element. Furthermore, the end ring can also be adapted to the outer diameter of the wire wound filter.
[0046] Wire wound filter 1 Figure 2 It is shown in a perspective view without the connecting element 2 .
[0047] from Figure 2 As can be seen in FIG. 2 , the wire filter 2 comprises a support element 6 forming a tubular support structure. In addition, at least one wire 8 is provided, which is wound on the support structure, and the at least one wire 8 and the support structure formed by the support element 6 are welded together.
[0048] The cross-sectional profiles of the support elements 6 each taper outwardly in a radial direction and the support elements 6 are arranged relative to each other such that they do not contact each other. The at least one support structure 6 and the at least one winding 8 consist of boron-treated steel.
[0049] Since the wire wound filter consists of boron treated steel and the boron penetrates into the material of the wire wound filter, the boron does not separate during use. The wire wound filter of the present invention is significantly stronger and shows fewer signs of corrosion and erosion during use. Since the entire wire wound filter is treated with boron, the entire wire wound filter has a particularly high surface hardness. The boron treatment does not round the edges of the wire windings, but the edges remain sharp. This is different from coatings in which the coating rounds the edges. Due to the sharp edges of the wire windings, less turbulence occurs during use. The pressure loss is smaller and the flow is improved.
[0050] In addition, Figure 2 As can be clearly seen in FIG, at least for 50% of the surface of the wire wound filter, the minimum distance between two wire windings can be between 1 μm and 50 mm. In the embodiment shown, the minimum distance between two wire windings is between 1 μm and 50 mm over the entire surface. It is particularly preferred that at least for 50% of the surface of the wire wound filter, the minimum distance between two wire windings is between 100 μm and 300 mm.
[0051] In this way, crude oil, natural gas and water can be filtered in an optimal manner.
[0052] Figure 3 Shows Figure 1 Detail of the end of the wound filter 1. There, the end ring 4 is connected to the wound filter 1, preferably welded to the wound filter 1. Furthermore, the end ring 4 is connected to a further connecting element 2. In addition, Figure 3 A detail of a longitudinal section of the wound filter 1 is also shown. Figure 5The longitudinal section is described in more detail. The wire wound filter 1 has an outer diameter D and an inner diameter d. In addition, Figure 3 A cross section through a wound filter 8 is shown. Furthermore, the cross section extends between two adjacent support elements 6 so that Figure 3 A side view of the support element 6 can be seen in FIG.
[0053] The outer diameter of the wire wound filter is usually expressed in inches. 1" is equal to 2.54 cm. The diameter of the wire wound filter may have an outer diameter preferably between 1" and 15", in particular between 1.5" and 10", particularly preferably between 1.9" and 7 5 / 8". More specifically, the wire wound filter may have the following outer diameters: 1.9" 2 3 / 8" 2 7 / 8" 3 1 / 2" 4 1 / 2" 5 1 / 2" 7.00" 7 5 / 8". However, the wire wound filter may also have any desired outer diameter therebetween.
[0054] Figure 4 is a cross-sectional view of a wire wound filter 1. There, a support element 6 forming a tubular support structure is shown in cross section. A view of at least one wire winding 8 can also be seen. The support element 6 tapers outwardly in a conical manner in the radial direction R. It can also be seen that the support elements are spaced apart.
[0055] Due to the cross-sectional profiles and the arrangement relative to one another of the support element and the windings provided by the invention, the winding filter has particularly good flow characteristics. Due to the good flow characteristics, fewer signs of erosion occur.
[0056] Figure 5 is a longitudinal section through a wire wound filter 1. At least one wire winding 8 is shown in section, and a view can be seen with respect to at least one supporting element 6. For 50% of the surface of the wire wound filter 1, the minimum distance A between two wire windings 8a, 8b can be between 1 μm and 50 mm. Furthermore, the cross-sectional profile of the at least one wire winding 8 can taper inwardly in a radial direction R. Thus, the cross-sectional profile of the supporting element tapers inwardly in a radial direction R, while the cross-sectional profile of the at least one wire wound filter tapers inwardly in a radial direction R.
[0057] Figure 6The cross-sectional profiles of at least one winding 8 and of the support element 6 are shown. The width C of the winding is preferably smaller than the width F of the support element. Furthermore, the height E of the at least one winding 8 is also preferably smaller than the height H of the support element 6. The cross-sectional profiles of the at least one winding and of the at least one support element have a similar shape, i.e. a tapering shape. However, as already described before with reference to the previous figures, the cross-sectional profiles are arranged differently, so that the cross-sectional profile of the support element tapers outwardly, while the cross-sectional profile of the at least one winding tapers inwardly.
[0058] Figure 7 The steps of a method for producing a wound filter are shown. In a first step, a steel support element is produced, the cross-sectional profile of which tapers conically.
[0059] Then, the support elements are arranged so that the arranged support elements form a tubular support structure, and the cross-sectional profiles of the support elements each taper outwardly in a radial direction, and the support elements are spaced apart from each other and do not contact each other.
[0060] These support elements are held in the arranged shape using holding means, not shown.
[0061] In a further step, not shown, at least one steel winding is produced. This is wound on a support element held by means of a holding device and the winding is connected to the support element using a welding method. In the second image, the support element after being connected to the winding is shown.
[0062] Thereafter, the holding device is removed and the wire wound filter is treated with boron. Here, the wire wound filter is preferably arranged in a closed furnace 10 and the furnace 10 is heated in the presence of a boronizing agent. This is shown in the third image. The furnace temperature during heating is preferably between 750° C. and 950° C. The wire wound filter is therefore treated with the chemical element boron at a temperature of preferably 750° C. to 950° C., so that the boron penetrates into the upper layers of the wire wound filter. These layers are preferably 100 to 250 μm thick. In this way, a strong wire wound filter is formed.
[0063] Erosion testing was performed on the wound filter of the present invention. Erosion testing was performed as described in the following publication: "Performance of Ceramic Sand Screen for High Rate Gas Application-Gas Sand Screen Erosion Testing" Nickolas Manning; Paul Cadogan; Peter Barth; Ben Hoskin; Trent Read; David Manning; Richard Jackson; Bhargava Gundemoni; SPE Asia Pacific Oil and Gas Conference and Exhibition, Brisbane, Australia; October 2018; Article Number: SPE-191942-MS.
[0064] In this publication, an erosion test and its use for evaluating erosion resistance are described. The erosion test is performed to simulate "accelerated" erosion conditions in a borehole. A gas-sand mixture is combined at a high flow rate in an acceleration pipe. The sand particles hit the filter to be tested at high speed (>80m*s-1). In this article, an erosion test was performed for 48 hours at maximum velocity (>80m*s-1) and a sand concentration of 750ppmw. It should be noted that the velocities mentioned in this report are significantly higher than those that conventional reservoir systems have to withstand.
[0065] In the erosion test, the test device is operated with compressed air. The main air flow is controlled via a volume flow controller. The auxiliary air flow is supplied to the controller in the bypass and used to inject the sand. The sand mass flow is regulated using a sand metering device with a worm gear and this mass flow is supplied to the bypass at atmospheric pressure. After the main and auxiliary air flows are merged, the air-sand mixture is passed through a horizontal pipe route, in which the particles are accelerated so that a set impact velocity is reached. The erosion of the test filter takes place in a sample chamber at the end of the pipe route, where the air-sand mixture impacts the filter surface vertically. The design of the sample chamber results in the separation of most of the particles directly on the floor of the chamber. The remaining particles in the air are removed from the exhaust air flow in a downstream cyclone separator.
[0066] Test conditions for corrosion testing:
[0067]
[0068] For this test, a surface profile of a cross section of the wire wound filter of the present invention was generated using a microscope Keyence VHX 2000 before and after the erosion test. Two erosion tests were performed, one erosion test for 2 hours and another erosion test for 48 hours. All erosion tests were performed under the above conditions.
[0069] First, a first surface profile analysis is performed before the first erosion test in order to be able to compare the filter with later measurements and detect possible damage. In this analysis, a strip along the filter surface is measured and a 3D model is generated. Then, the wound filter is placed in the test chamber. It is fastened to the cover of the sample chamber by a further flange so that the filter cannot move and the volume flow can hit the filter unhindered.
[0070] In order to be able to start the test device, the volume flow controller is first set to the desired value. When this value is reached, the required sand mass flow is injected into the air flow via the injector using a sand meter. The filter is sandblasted - as shown - for a period of 2 hours or 48 hours.
[0071] Before the erosion tests were carried out, surface analysis showed height differences of up to 100 μm between the meshes of the wire wound filters (see Figure 8 ).
[0072] Fig. 9 The surface profile of the same filter section after a 2-hour erosion test is shown. The surface shows no significant changes. The height difference of the individual webs is even slightly smaller than before. Similarly, after a 48-hour erosion test, no surface erosion along the contour line could be measured. The roughness of the individual webs was reduced even more. The height difference between the raised and non-raised surfaces is less than 50 μm. The three different lines in the figure show the results of three parallel comparative measurements. It should be noted that Figures 8 to 10 The scale of the measurements is different.
[0073] Fig.10 is a macroscopic image of the filter after a 48-hour erosion test. Slight wear of the surface can be detected at the point where the sand stream hits the filter. Comparison of the blasted and unblasted filter surfaces shows no significant height differences indicating erosion. During both the 2-hour and 48-hour treatments, erosion was so small that it was covered by the initial unevenness of the individual webs. Surface measurements of the filter sample that was only blasted for 48 hours showed a slightly more uniform surface than the original sample, which may indicate edge erosion.
[0074] However, in general, wire wound filters have very good erosion resistance.
Claims
1. A wire wound filter (1) for filtering crude oil, natural gas or water, comprising: at least one tubular support structure formed by support elements (6), at least one winding wire (8) wound around the support structure, the at least one winding wire (8) and the support structure formed by the support element (6) being welded to each other, It is characterized in that The cross-sectional profiles of the support elements (6) each taper outwardly in a radial direction and are arranged relative to each other such that they do not touch, wherein at least the support structure and the at least one winding (8) consist of boron-treated steel.
2. The wire wound filter (1) according to claim 1, characterized in that The cross-sectional profile of the at least one winding (8) tapers inwardly in the radial direction.
3. The wire wound filter (1) according to claim 1 or 2, characterized in that At least for 50% of the surface of the wire wound filter (1), the minimum distance (A) between two wire wound windings (8a, 8b) is between 1 μm and 50 mm.
4. The wire wound filter (1) according to any one of claims 1 to 3, characterized in that The minimum distance between adjacent support elements (6) is greater than the minimum distance (A) between two wound windings (8a, 8b).
5. The wire wound filter (1) according to any one of claims 1 to 4, characterized in that An internal perforated conduit is arranged inside the support structure.
6. The wire wound filter (1) according to claim 5, characterized in that The perforated pipe arranged inside the support structure is treated with boron.
7. The wire wound filter (1) according to any one of claims 1 to 6, characterized in that The outer diameter of the wire wound filter (1) is between 30 mm and 300 mm.
8. The wire wound filter (1) according to any one of claims 1 to 7, characterized in that The wire wound filter (1) is connected to an end ring (4) at least at one of the two ends, preferably welded to the end ring (4).
9. The wire wound filter (1) according to any one of claims 1 to 8, characterized in that The support structure and the at least one winding wire (8) are made of stainless steel.
10. A method for manufacturing a wire wound filter (1), comprising the steps of: Providing support elements (8) made of steel, each support element having a respective conically tapering cross-sectional profile; Arranging the support elements (8), wherein the support elements (8) are arranged so that the arranged support elements (8) form a tubular support structure, and the cross-sectional profiles of the support elements (8) each taper outwardly in the radial direction, and the support elements (8) are spaced apart from each other and do not contact each other; Using a retaining device to retain the support element (8) in the arranged shape; Providing at least one winding wire (6) consisting of steel; Winding the winding wire (6) on the arranged support element (8) held by the holding device; connecting the winding (6) to the supporting element (8) using welding techniques; removing the retaining device; The wire wound filter (1) is treated with boron.
11. The method according to claim 10, characterized in that The boron treatment comprises the following steps: placing the support element (8) and the winding wire (6) connected to the support element (8) into a closed furnace (10); The heating is carried out in the presence of a boriding agent.
12. The method according to claim 11, characterized in that The heating is up to 750°C to 950°C.
13. The method according to any one of claims 10 to 12, characterized in that The at least one winding wire (6) is manufactured such that a cross-sectional profile of the at least one winding wire (6) tapers gradually inwardly in the radial direction.
14. The method according to claim 13, characterized in that The at least one wire winding (6) is wound on the support element (8) such that, at least for 50% of the surface of the wire wound filter, the minimum distance between two wire windings is between 1 μm and 50 mm.
15. The method according to any one of claims 10 to 14, characterized in that The support elements are arranged relative to one another and the winding wire is wound on the support elements such that a minimum distance between adjacent support elements is greater than a minimum distance between two winding wire windings.