Circular seam type sand filtering pipe

Abstract

The utility model relates to the technical field of sand filtering pipes, in particular to a circular seam type sand filtering pipe which comprises an upper central pipe, a lower central pipe, a connecting part and an elastic filtering assembly, the lower end of the upper central pipe is connected with the lower central pipe through the connecting part, an upper pressing ring is installed on the outer side of the upper central pipe, and a lower pressing ring is in threaded connection with the outer side of the lower central pipe. An elastic filtering assembly arranged on the connecting part in a sleeving mode is arranged between the upper pressing ring and the lower pressing ring, and the elastic filtering assembly can be compressed to reduce the filtering gap. The sand filtering pipe is reasonable and compact in structure and convenient to use, the elastic filtering assembly is compressed by adjusting the position of the lower pressing ring and applying pressure to the elastic filtering assembly, then the filtering gap is adjusted, different sand prevention requirements are met, the problem that in the prior art, the gap size is inconvenient to adjust is solved, and the universality and use flexibility of the sand filtering pipe are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand filter pipes and is an annular seam type sand filter pipe. Background Art

[0002] The commonly used downhole sand control screens in oil and gas fields mainly include metal wire-wound screens, slotted screens, mesh screens, metal felt sand control pipes, ceramic sand control screens, etc. The metal wire-wound screens and slotted screens have limited manufacturing process and tooling, which limits the lower screen gap accuracy. Especially for wells with screen gaps less than 0.15 mm, the screen gap manufacturing error (greater than 10%) is difficult to meet the sand control needs, resulting in sand penetration in wide gaps and easy blockage in narrow gaps. At the same time, due to the different sorting and rounding degrees of formation sand, for wells with poor oil layer sorting and low median particle size, fine sand particles with a particle size lower than the gap width can still pass through the sand filter, resulting in sand control failure. For some strata with poor sand and gravel sorting, silty sand with low median particle size and high mud content, the sand control screen is easy to be blocked and sand is produced due to different gap sizes, resulting in a short effective period of sand control and unsatisfactory sand control effect. The sand retaining accuracy of the mesh screen can meet the sand control needs, but the screen is easy to be blocked due to the adsorption of silty sand and mud clay particles, and the sand particles are dissolved in steam injection thermal recovery wells. Therefore, the sand control screen with existing structure, sand retaining accuracy and material can hardly meet the actual needs of the project.

[0003] In the prior art, CN217632386U discloses a ring-slit high-precision sand filter tube, including a central screen tube, an upper pressure cap, a sand filter ring sheet and a lower adjustment ring. The sand filter ring sheets are stacked and sleeved on the central screen tube, and fixed on the central screen tube by the upper pressure cap and the lower adjustment ring. After being installed, the upper pressure cap and the lower adjustment ring are tightened to compress the sand filter ring sheets and form a uniform high-precision gap, which is used for filtering sand. A number of transparent holes are evenly arranged on the central screen tube. The lower side of the sand filter ring sheet is a plane, and a boss is arranged on the upper side. The protruding height of the boss is the set sand filter gap width. Multiple sand filter ring sheets are stacked on the central screen tube in order to form multiple annular sand filter flow systems. The gap accuracy, permeability, permeability, corrosion resistance and wear resistance, and manufacturing process of the utility model are superior to those of the commonly used wire wound screen tubes. The sand filter gap formed by the overlapping sand filter rings is narrow on the outside and wide on the inside. Fine sand particles below the gap radius are difficult to stay in the sand filter gap and are more easily carried out by the liquid flow.

[0004] The prior art solution uses an annular disc structure to play a filtering role. It sets a convex structure on the upper part of the annular disc to form a support, and then forms a filtering gap. However, the size of the filtering gap in the above technical solution is not easy to adjust. When it is necessary to change the size of the filtering gap, annular discs of different specifications need to be replaced, which reduces its versatility. Moreover, the prior art uses the method of opening holes on the central screen pipe to pass liquid. This method causes only the annular discs at the hole-opening parts to play a filtering role, easily resulting in a relatively fast liquid flow rate at the hole-opening parts, and thus the annular discs at the hole-opening parts are vulnerable to damage under the impact of the fluid. Summary of the Invention

[0005] The utility model provides an annular slit sand control pipe, which overcomes the deficiencies of the above prior art and can effectively solve the problems that the existing sand control pipe is not easy to adjust the filtering gap and has low versatility.

[0006] The technical solution of the utility model is realized by the following measures: an annular slit sand control pipe, which includes an upper central pipe, a lower central pipe, a connecting component and an elastic filtering component. The lower end of the upper central pipe is connected to the lower central pipe through the connecting component. An upper pressing ring is installed on the outer side of the upper central pipe, and a lower pressing ring is threadedly connected to the outer side of the lower central pipe. An elastic filtering component sleeved on the connecting component is arranged between the upper pressing ring and the lower pressing ring, and the elastic filtering component can be compressed to reduce the filtering gap.

[0007] The following is a further optimization or / and improvement of the above technical solution of the utility model:

[0008] Preferably, the elastic filtering component includes a plurality of filtering rings and elastic warping pieces. The filtering rings are sleeved on the connecting component, and a plurality of elastic warping pieces are arranged along the circumference on the upper side or the lower side of each filtering ring. The elastic warping pieces are in a "匚" shape.

[0009] Preferably, the connecting component is a connecting rod.

[0010] Preferably, gaskets are arranged on the lower side of the upper pressing ring and the upper side of the lower pressing ring.

[0011] Preferably, it further includes a locking bolt, and a locking bolt capable of tightly pressing the lower central pipe is arranged on the lower pressing ring.

[0012] The structure of the utility model is reasonable and compact, and it is convenient to use. By adjusting the position of the lower pressing ring to apply pressure to the elastic filtering component, the elastic filtering component is compressed, and then the filtering gap is adjusted to adapt to different sand control requirements, solving the problem that the gap size in the prior art is not easy to adjust, and improving the versatility and use flexibility of the sand control pipe. Brief Description of the Drawings

[0013] Attached Figure 1 is the main sectional structural schematic diagram of the embodiment of the utility model.

[0014] Attached Figure 2For attachment Figure 1 Schematic upward view structure diagram of the filter ring in Figure 1 .

[0015] The codes in the attached drawings are respectively: 1 is the upper central pipe, 2 is the lower central pipe, 3 is the connecting rod, 4 is the filter ring, 5 is the elastic fin, 6 is the washer, 7 is the locking bolt, 8 is the upper pressing ring 8, and 9 is the lower pressing ring 9. Specific implementation mode

[0016] The present utility model is not limited by the following embodiments, and the specific implementation mode can be determined according to the technical solution of the present utility model and the actual situation.

[0017] In the present utility model, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the attached drawings of the specification. For example, the position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the attached drawings of the specification. Figure 1 The position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the attached drawings of the specification.

[0018] The present utility model will be further described below in conjunction with the embodiments and the attached drawings:

[0019] Embodiment 1: As shown in Figure 1 Figure 1 、 2 This annular slit sand filter tube includes an upper central pipe 1, a lower central pipe 2, a connecting component, and an elastic filtering component. The lower end of the upper central pipe 1 is connected to the lower central pipe 2 through the connecting component. An upper pressing ring 8 is installed outside the upper central pipe 1, and a lower pressing ring 9 is threadedly connected outside the lower central pipe 2. An elastic filtering component sleeved on the connecting component is arranged between the upper pressing ring 8 and the lower pressing ring 9, and the elastic filtering component can be compressed to reduce the filtering gap.

[0020] During operation, through the elastic filtering component between the upper pressing ring 8 and the lower pressing ring 9, a filtering structure is formed, thereby realizing filtration. By adjusting the position of the lower pressing ring 9, the lower pressing ring 9 squeezes the elastic filtering component, the elastic filtering component is compressed, and thus the filtering gap between the elastic filtering components is reduced, thereby realizing the adjustment of the filtering distance. There is no need to replace the internal components, which is more convenient and has a high filtering gap adjustment accuracy.

[0021] According to actual needs, the above annular slit sand filter tube can be further optimized or / and improved:

[0022] Embodiment 2: As shown in Figure 1 Figure 1 、 2 The elastic filtering component includes a plurality of filter rings 4 and elastic fins 5. The filter rings 4 are sleeved on the connecting component. A plurality of elastic fins 5 are arranged along the circumference on the upper side or the lower side of each filter ring 4, and the elastic fins 5 are in a C shape. The elastic fins 5 are stamped on the filter rings 4 and can be compressed. The filter rings 4 and the elastic fins 5 are made of wear-resistant and corrosion-resistant materials. The opening direction of the elastic fins 5 can be set according to needs.

[0023] Embodiment 3: As attached Figure 1 As shown, the connecting component is a connecting rod 3. The connecting rod 3 increases the passing surface, effectively avoiding the problem of excessive local flow velocity caused by the ring sheet at the opening only filtering in the prior art, making the fluid more evenly distributed in the sand filter tube and reducing the erosion of the filter structure by the fluid impact.

[0024] Embodiment 4: As attached Figure 1 As shown, washers 6 are provided on the lower side of the upper pressure ring 8 and the upper side of the lower pressure ring 9. The washers 6 have the effect of buffering and reducing erosion.

[0025] Embodiment 5: As attached Figure 1 As shown, it also includes a locking bolt 7, and the lower pressing ring 9 is provided with a locking bolt 7 that can tighten the lower central tube 2. The lower pressing ring 9 is further fixed by arranging the locking bolt 7 to maintain the filtering gap of the elastic filtering assembly.

[0026] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An annular seam type sand filter pipe, characterized in that It includes an upper central tube, a lower central tube, a connecting component and an elastic filtering component. The lower end of the upper central tube is connected to the lower central tube through the connecting component. An upper pressing ring is installed outside the upper central tube, and a lower pressing ring is threadedly connected to the outside of the lower central tube. An elastic filtering component sleeved on the connecting component is arranged between the upper pressing ring and the lower pressing ring, and the elastic filtering component can be compressed to reduce the filtering gap.

2. The annular seam type sand filter pipe according to claim 1, characterized in that The elastic filtering component includes a plurality of filtering rings and elastic fins. The filtering rings are sleeved on the connecting component, and a plurality of elastic fins are arranged along the circumference on the upper side or the lower side of each filtering ring. The elastic fins are in a C shape.

3. The annular seam type sand filter pipe according to claim 1 or 2, characterized in that The connecting component is a connecting rod.

4. The annular seam type sand filter pipe according to claim 1 or 2, characterized in that Gaskets are provided on the lower side of the upper pressing ring and the upper side of the lower pressing ring.

5. The annular seam type sand filter pipe according to claim 3, characterized in that Gaskets are provided on the lower side of the upper pressing ring and the upper side of the lower pressing ring.

6. The annular seam type sand filter pipe according to claim 1, 2 or 5, characterized in that It further includes a locking bolt, and a locking bolt capable of tightly pressing against the lower central tube is provided on the lower pressing ring.

7. The annular seam type sand filter pipe according to claim 3, characterized in that It further includes a locking bolt, and a locking bolt capable of tightly pressing against the lower central tube is provided on the lower pressing ring.

8. The annular seam type sand filter pipe according to claim 4, characterized in that It further includes a locking bolt, and a locking bolt capable of tightly pressing against the lower central tube is provided on the lower pressing ring.

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