Filter pipe with detachable and replaceable screen pipe

Abstract

The utility model belongs to the field of filtering equipment, and particularly relates to a filtering pipe with a detachable and replaceable screen pipe. Comprising a drilling center pipe and a wire-wrapped screen pipe, the wire-wrapped screen pipe is arranged on the outer side of the drilling center pipe in the circumferential direction of the drilling center pipe, and the drilling center pipe and the wire-wrapped screen pipe form a layered structure; specifically, the drilling center pipe is divided into two parts, one part is a filtering part, the other part is a connecting part, the two ends of the filtering part are a fixing end and a penetrating and sleeving end respectively, the wire winding screen pipe penetrates and sleeves the outer side of the filtering part from the penetrating and sleeving end, and the two ends of the wire winding screen pipe are fixed through two baffle rings respectively; the connecting part is connected with fixing equipment through threads or flanges. The utility model has the advantages that the wire-wound screen pipe is connected with the drilling central pipe in a penetrating and sleeving manner, so that the field operation of replacing the filter pipe is facilitated, the waste of equipment is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of filtering equipment, in particular to a filtering tube with a detachable and replaceable screen tube. Background Art

[0002] In many industrial productions, filter tube equipment is often used. For example, in the process of oil extraction, filter tubes composed of an outer wire-wound screen tube and an inner drilled center tube are often used. During the operation of the filter tube, the outer wire-wound screen tube is often impacted and blocked, and sometimes it is also affected by factors such as environmental pressure and filter media, and often suffers damage. In order not to affect the filtering work, it is necessary to remove the filter tube as a whole from the fixed equipment and replace it with a new one or reinstall it after maintenance.

[0003] However, the overall replacement or repair of the filter tube needs to be carried out at the filtration site, and the filter tube needs to be removed from the fixed equipment, which brings a lot of inconvenience to the operation; moreover, if only the outer wire-wrapped screen tube is damaged and the internal drilled center tube is not damaged, the overall replacement of the filter tube will lead to a waste of equipment and increase the production cost. Utility Model Content

[0004] The utility model aims to provide a filter tube with a detachable and replaceable screen tube, which is used to solve the problem of inconvenience in operation and production waste caused by the need to remove the filter tube as a whole from a fixed device once the wire-wrapped screen tube is blocked or damaged during use of the filter tube.

[0005] The technical scheme of the utility model is: a filter tube with a detachable and replaceable screen tube, comprising a drilled central tube and a wire-wrapped screen tube, wherein the wire-wrapped screen tube is arranged on the outer side of the drilled central tube along the circumference of the drilled central tube, and the drilled central tube and the wire-wrapped screen tube form a layered structure; specifically, the drilled central tube is divided into two parts, one part is a filtering part, and the other part is a connecting part, the two ends of the filtering part are respectively a fixed end and a sleeve-through end, the wire-wrapped screen tube is sleeved on the outer side of the filtering part from the sleeve-through end, and the two ends of the wire-wrapped screen tube are fixed by two retaining rings respectively; the connecting part is connected to a fixing device by a thread or a flange.

[0006] Furthermore, in order to facilitate the fixing of the wire-wrapped screen tube on the outside of the drilled center tube, the retaining rings are respectively a fixed retaining ring and a sleeve retaining ring. The fixed retaining ring is located at the fixed end of the drilled center tube, the fixed retaining ring is sleeved on the filter part, and is limited by the retaining ring on the drilled center tube; the sleeve retaining ring is located at the sleeve end of the filter part and is fixed by a nut.

[0007] Furthermore, in order to better fix the two ends of the wire-wrapped screen tube, corresponding stoppers are respectively provided on the fixed baffle ring and the sleeve baffle ring, and the two ends of the wire-wrapped screen tube are fixed by the stoppers on the fixed baffle ring and the sleeve baffle ring, and the size of the stoppers is just enough to accommodate the wire-wrapped screen tube.

[0008] Furthermore, in order to protect the two ends of the wire-wrapped screen tube from damage, rubber rings are respectively provided on the contact surfaces of the fixed retaining ring and the sleeve retaining ring with the wire-wrapped screen tube.

[0009] Furthermore, in order to improve the adaptability of the filter tube, the holes on the drilled central tube can be determined according to actual working conditions, and circular holes and / or strip holes are evenly distributed on the drilled central tube.

[0010] The beneficial effects of the utility model are as follows: the utility model uses a movable connection between the wire-wrapped screen tube and the drilled center tube, and particularly adopts a sleeve-through manner to be arranged on the outside of the filter portion of the drilled center tube. When the wire-wrapped screen tube is blocked or damaged, the wire-wrapped screen tube can be easily removed from the drilled center tube, making it convenient to replace a new wire-wrapped screen tube and facilitating on-site operation of the filter tube; when the outer layer of the filter tube is blocked or damaged, only the wire-wrapped screen tube needs to be replaced, and the inner layer of the drilled center tube can still be used, thereby reducing waste on equipment and lowering production costs.

[0011] A fixed retaining ring and a sleeve retaining ring are arranged on the filter tube, and corresponding stoppers are arranged on the fixed retaining ring and the sleeve retaining ring respectively, and the size of the stoppers is just consistent with the outer diameter of the wire-wrapped screen tube. When the wire-wrapped screen tube is sleeved on the drilled center tube, its two ends are respectively fixed by the fixed retaining ring and the corresponding stoppers on the sleeve retaining ring, which can improve the fixation degree of the wire-wrapped screen tube on the filter tube; when the wire-wrapped screen tube needs to be replaced, it is only necessary to open the sleeve retaining ring and remove the wire-wrapped screen tube from the drilled center tube, which does not affect the operation of replacing the wire-wrapped screen tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the preferred three-dimensional structure of the filter tube of the utility model;

[0013] Figure 2 This is a schematic diagram of the preferred three-dimensional structure of the drilling center tube of the utility model;

[0014] Figure 3 This is a schematic diagram of the preferred three-dimensional structure of the fixed baffle ring of the utility model;

[0015] Figure 4 It is a schematic diagram of the preferred three-dimensional structure of the sleeve-through retaining ring of the utility model.

[0016] In the figure:

[0017] 1. Drilling center tube 101, connecting part 102, filtering part

[0018] 103, retaining ring 104, screw 2, wire-wound screen tube

[0019] 201, fixed retaining ring 2011, lower stop 202, sleeve retaining ring

[0020] 2021, Top stop DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0022] It should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model 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 cannot be understood as a limitation on the utility model.

[0023] See also Figures 1 to 4

[0024] A filter tube with a detachable and replaceable screen tube, the filter tube 102 used comprises a drilled central tube 1 and a wire-wound screen tube 2, a retaining ring 103 is arranged on the outer side of the drilled central tube 1 along the circumferential direction, the retaining ring 103 divides the outer side of the drilled central tube 1 into two parts, the retaining ring 103 to one end of the drilled central tube 1 is a filter part 102, 5 to 6 circular holes are evenly opened at fixed intervals along the outer circumference of the filter part 102, the wall of the drilled central tube 1 blocks impurities or large particles in the filter medium, the circular holes are used for the fluid in the filter medium to pass through, and a screw 104 is fixedly arranged on the circular side surface of the filter part 1;

[0025] The other end from the retaining ring 103 to the drilling center pipe 1 is a connecting part 101, on which a thread is arranged, and the connecting part 101 is connected to a fixing device through the thread.

[0026] The wire-wrapped screen tube 2 is arranged on the filter part 102 along the outer side of the borehole center pipe 1, and forms a layered structure with the wire-wrapped screen tube 2; the two ends of the filter part 102 are respectively a fixed end and a sleeve-through end, the wire-wrapped screen tube is inserted from the sleeve-through end and sleeved on the outer side of the filter part 102, and the two ends of the wire-wrapped screen tube 2 are respectively fixed by a fixed retaining ring 201 and a sleeve-through retaining ring 202; corresponding stoppers are respectively arranged on the fixed retaining ring 201 and the sleeve-through retaining ring 202, and after the fixed retaining ring 201 is sleeved on the filter part 102, it can be fixed on the retaining ring 103 by bolts, The fixed stop ring 201 is provided with a stop with an inwardly recessed annular groove, which is the lower stop 2011, and a rubber ring is provided inside the lower stop 2011; the sleeve stop ring 202 is provided with a stop with an inwardly recessed annular groove, which is the upper stop 2021, and a rubber ring is provided inside the upper stop 2021. The upper stop 2021 is sleeved on the screw 104 of the filter part 102 and fixed by a nut; the direction of the upper stop 2021 is opposite to that of the lower stop 2011, and the size of the upper stop 2021 and the lower stop 2011 is just enough to accommodate the two ends of the wire-wrapped screen tube 2.

[0027] In actual use, during oil production, the filter tube is used for sand prevention. The filter tube for sand prevention is lowered into the wellhead of the oil well. When fine sand, impurities and other substances entrained in the filter medium pass through the filter tube, the particulate matter in the fluid is blocked by the wall of the borehole center tube 1 and the wall of the wire-wrapped screen tube 2, and the fluid flows out through the holes on the borehole center tube 1 and the wire-wrapped screen tube 2. When the wire-wrapped screen tube 2 is blocked and the wire-wrapped screen tube 2 cannot perform sand prevention filtering work, it is necessary to replace the wire-wrapped screen tube 2, open the nut on the screw 104, remove the sleeve retaining ring 202 from the filter part 102, and remove the sleeved wire-wrapped screen tube 2 from the filter part 102. After replacing it with a new wire-wrapped screen tube 2, install the sleeve retaining ring 202 and tighten the nut on the screw 104 to complete the replacement of the wire-wrapped screen tube 2 on the outer layer of the filter tube.

[0028] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A filter tube with a detachable and replaceable screen tube, comprising a drilled center tube and a wire-wrapped screen tube, wherein the wire-wrapped screen tube is arranged outside the drilled center tube along the circumference of the drilled center tube, and the drilled center tube and the wire-wrapped screen tube form a layered structure; characterized in that: The drilled center pipe is divided into two parts, one part is the filter part, and the other part is the connection part. The two ends of the filter part are a fixed end and a sleeve end respectively. The wire-wrapped screen tube is sleeved on the outside of the filter part from the sleeve end, and the two ends of the wire-wrapped screen tube are fixed by two retaining rings respectively; the connection part is connected to the fixed equipment by threads or flanges.

2. The filter tube with a detachable and replaceable screen tube according to claim 1, characterized in that: The retaining rings are respectively a fixed retaining ring and a sleeve retaining ring. The fixed retaining ring is located at the fixed end of the drilled center tube, the fixed retaining ring is sleeved on the filter part, and is limited by the retaining ring on the drilled center tube; the sleeve retaining ring is located at the sleeve end of the filter part and is fixed by a nut.

3. The filter tube with a detachable and replaceable screen tube according to claim 2, characterized in that: The fixed retaining ring and the sleeve retaining ring are respectively provided with corresponding stoppers, and the wire-wrapped screen tube is fixed at both ends by the stoppers on the fixed retaining ring and the sleeve retaining ring, and the size of the stoppers is just enough to accommodate the wire-wrapped screen tube.

4. The filter tube with a detachable and replaceable screen tube according to claim 3, characterized in that: The fixed retaining ring and the sleeve retaining ring are respectively provided with rubber rings on the contacting surfaces with the wire-wrapped screen tube.

5. The filter tube with a detachable and replaceable screen tube according to any one of claims 1 to 4, characterized in that: Circular holes and / or strip holes are evenly distributed on the drilled central tube.

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