Filtering device for water injection well

Abstract

The utility model relates to a water injection well filtering device which comprises a multi-way pipe, the multi-way pipe is provided with a water inlet pipe opening and a water outlet pipe opening which are coaxially arranged in a back-to-back mode, the multi-way pipe is further provided with a filtering blow-off pipe opening perpendicular to the direction of the water inlet pipe opening and the direction of the water outlet pipe opening, and a flow guide reversing partition is arranged at the junction of an inner cavity of the multi-way pipe. The flow guide reversing partition is provided with an overflowing hole which is through in the facing direction of the filtering blow-off pipe opening, so that a water flow channel which allows water flowing in from the water inlet pipe opening to flow through the overflowing hole after reversing and flow out from the water outlet pipe opening after reversing again is formed in the inner cavity of the multi-way pipe, and a first plugging piece is mounted at the filtering blow-off pipe opening; a filter pipe is installed between the first plugging piece and the flow guide reversing partition, the extending direction of the filter pipe is the same as that of the overflowing hole, and water flowing out of the overflowing hole flows into the filter pipe and flows to the water outlet pipe opening after being filtered through the pipe wall of the filter pipe. After high-pressure water is reversed for multiple times through the flow guide reversing partition, the impact and scouring of the high-pressure water to the filter pipe are greatly weakened, so that the filter pipe is protected from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a water injection well filtering device. Background Technique

[0002] The water meter of the water injection pipeline represents the pressure of the formation injection water, which is an important parameter for formation water injection. Formation water injection is implemented according to the pressure of the water meter in the water injection pipeline. After long-term corrosion and mechanical wear of the oilfield pipeline, there are a large amount of dirt and rust flakes. Then, under the impact of high-pressure water, the dirt particles and rust flakes corroded and worn inside the pipeline fall off. When water is injected, the fallen dirt particles and rust flakes are washed to the water meter by the water flow, jamming the water meter, resulting in inaccurate water volume measurement and even damage to the water meter, affecting the daily management work.

[0003] In order to effectively solve the problem of water meter damage caused by long-term corrosion and mechanical wear of the oilfield pipeline, a filtering device for a water meter disclosed in the Chinese utility model patent with the authorization announcement number CN212491831U specifically discloses a cross-shaped pipeline. The cross-shaped pipeline is hollow inside. An inlet and an outlet are respectively arranged in the horizontal pipe direction, and a cylindrical filter screen is arranged in the vertical pipe direction. A filter screen water inlet pipe opening is opened near the inlet of the cylindrical filter screen, and the filter screen water inlet pipe opening is communicated with the inlet. A filter screen top cover is arranged at the top of the cylindrical filter screen, and a sewage discharge outlet is arranged at the bottom. A sealing plug is arranged in the sewage discharge outlet. When in use, the above filter is installed at the inlet of the water meter. Water enters from the inlet of the cross-shaped pipeline, enters the cylindrical filter screen through the filter screen water inlet pipe opening for filtering, filters the dirt particles and rust flakes and discharges them through the sewage discharge outlet, which can solve the technical problem that the fallen dirt particles and rust flakes are washed to the water meter during water injection, causing water meter damage. However, when the water injection pipeline conducts formation water injection, it is in a high-pressure state, and the water pressure in the pipeline is very high. When using this filtering device for filtering, the filtering device is easily damaged due to the high water pressure.

[0004] To solve the problem of high-pressure water damaging the filtering device, for example, the Chinese utility model patent with the authorized announcement number CN210613111U discloses a pipeline filter for oilfield water injection. Specifically, it discloses a cylindrical body with a four-way structure, which forms a filtering cavity inside. The filtering cavity is used to install a filter net. The upper end of the vertical cylindrical body is sealed by welding a blind plate, and the lower end is open to form a sewage discharge channel. Water inlets and water outlets are respectively arranged on the side walls on both sides; a pressure-bearing filter plate is welded in the middle of the vertical cylindrical body. The pressure-bearing filter plate is a steel plate obliquely arranged inside the vertical cylindrical body, and it is provided with a number of uniformly distributed round holes. The pressure-bearing plate divides the interior of the vertical cylindrical body into two parts, a sedimentation cavity and a buffer cavity. The buffer cavity is located above the pressure-bearing plate and is used to relieve the water flow. The sedimentation cavity is located below the filter net and is used to sediment and accommodate the sedimented impurities. A double-layer filtering device is formed by the filter net and the pressure-bearing plate, which can achieve water injection filtration. However, since there is a certain angle between the pressure-bearing plate and the water flow direction, the pressure from the high-pressure water is decomposed into a force along the direction of the pressure-bearing plate and a force perpendicular to the pressure-bearing plate. Compared with the previous filtering device, this filter relieves part of the impact force of the high-pressure water. However, in fact, the pressure of formation water injection is often as high as 6 Mpa, and the incoming water flushes the filter net at high speed and high pressure, which is also likely to cause damage to the filter net. Therefore, the effect of relieving the impact of high-pressure water is relatively limited. Utility Model Content

[0005] The purpose of the present utility model is to provide a filtering device for injection wells, so as to solve the technical problem that the filtering components in the prior art are easily damaged by water pressure.

[0006] To achieve the above purpose, the technical solution of a filtering device for injection wells provided by the present utility model is as follows: It includes a multi-way pipe. The multi-way pipe has an inlet pipe orifice and an outlet pipe orifice arranged coaxially and in opposite directions, and also has a filtering and sewage discharge pipe orifice perpendicular to the orientations of the inlet and outlet pipe orifices. A diversion and commutation partition is provided at the intersection position in the inner cavity of the multi-way pipe. The diversion and commutation partition has a flow-through hole penetrating in the orientation direction of the filtering and sewage discharge pipe orifice, so as to form a water flow channel in the inner cavity of the multi-way pipe for the water flowing in from the inlet pipe orifice to flow through the flow-through hole after commutation, and then flow out from the outlet pipe orifice after commutation again. A first plugging member is detachably installed at the filtering and sewage discharge pipe orifice. A filter pipe is installed in the inner cavity of the multi-way pipe between the first plugging member and the diversion and commutation partition. The extending direction of the filter pipe is the same as the extending direction of the flow-through hole. The water flowing out through the flow-through hole flows into the filter pipe and flows towards the outlet pipe orifice after being filtered by the pipe wall of the filter pipe.

[0007] Beneficial effects: The present utility model provides a new filtering device for injection wells, which adopts a multi-way pipe structure and is provided with a diversion and commutation partition at the intersection of the inner cavity of the multi-way pipe. When in use, high-pressure water enters the multi-way pipe from the water inlet pipe orifice, flows into the flow-through holes after being commuted by the diversion and commutation partition, enters the filter pipe, and flows to the water outlet pipe after being filtered through the pipe wall of the filter pipe; after the high-pressure water is commuted multiple times by the diversion and commutation partition, the impact and scouring of the high-pressure water on the filter pipe are greatly weakened, so as to achieve the purpose of protecting the filter pipe from being damaged.

[0008] Furthermore, the diversion and commutation partition includes a middle partition, the middle partition extends perpendicular to the orientation of the filtering and sewage discharge pipe orifice and is located in the middle of the cross-section of the water inlet pipe orifice, and the flow-through holes are located on the middle partition; the diversion and commutation partition further includes an inlet diversion partition and an outlet diversion partition at both ends of the middle partition, and both the inlet diversion partition and the outlet diversion partition extend along the direction of the filter pipe.

[0009] Furthermore, the inlet diversion partition is in a tile shape and is flush with the inner wall of the filtering and sewage discharge pipe orifice, the outer diameter of the filter pipe is equal to the inner diameter of the inlet diversion partition, the filter pipe is inserted into the inner cavity of the multi-way pipe from the filtering and sewage discharge pipe orifice, and is pressed on the middle partition by the first plugging member.

[0010] Furthermore, the first plugging member is a sewage plug, and a limiting boss is provided on the inner end face of the sewage plug, and the end of the filter pipe is sleeved outside the limiting boss of the sewage plug.

[0011] Furthermore, the size of the filter pipe is equal to that of the inner cavity of the multi-way pipe where it is located.

[0012] Furthermore, the outlet diversion partition is in a tile shape and is flush with the inner wall of the filtering and sewage discharge pipe orifice.

[0013] Furthermore, water passing holes are provided on the inlet diversion partition and / or the outlet diversion partition.

[0014] Furthermore, the multi-way pipe is a cross-shaped four-way pipe, and one end pipe orifice facing away from the filtering and sewage discharge pipe orifice is a cleaning pipe orifice, and a second plugging member is detachably installed in the cleaning pipe orifice.

[0015] Furthermore, the second plugging member is a cleaning plug. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a filtering device for injection wells of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the four-way pipe and the diversion and commutation partition in the filtering device for injection wells of the present utility model;

[0018] Figure 3 is in the filtering device for injection wells of the present utility model Figure 2 top view;

[0019] Figure 4 is the side view of the filtering device for water injection wells of the present utility model Figure 2 ;

[0020] Figure 5 is the structural schematic diagram of the sewage plug of the filtering device for water injection wells of the present utility model

[0021] In the figure: 1, four-way pipe; 2, filter pipe; 3, sewage plug; 31, limiting boss; 4, cleaning plug; 5, diversion and commutation partition; 51, middle partition; 52, inlet diversion partition; 53, outlet diversion partition; 54, water passing hole; 55, flow passing hole; 6, water outlet pipe orifice; 7, water inlet pipe orifice; 8, filtering and sewage pipe orifice; 9, cleaning pipe orifice Specific embodiments

[0022] The features and performance of the present utility model will be further described in detail below in conjunction with the embodiments

[0023] A filtering device for water injection wells of the present utility model is mainly designed for high-pressure water injection pipelines in oil fields. In oil field engineering, problems often occur such as the water meter being blocked and inaccurate measurement due to dirt particles and rust flakes falling off in the pipeline. In the prior art, a filtering device is generally installed at the water meter inlet to filter dirt particles and falling rust flakes, and the sundries are isolated far away from the water meter. However, in fact, the formation water injection pressure is often as high as 6 Mpa. The existing filtering devices either do not consider the impact and scouring of high-pressure water on the filter screen at all, or consider the impact and scouring of high-pressure water on the filter screen, but the compressive strength is insufficient

[0024] Therefore, the present application provides a new filtering device for water injection wells. On the one hand, by arranging a diversion and commutation partition in the multi-way pipe, the high-pressure water is changed direction multiple times to weaken the impact and scouring of the high-pressure water on the filter pipe, and the water after commutation then enters the filtering structure for filtration. On the other hand, the structural strength of the part impacted by high-pressure water is enhanced, such as processing the structure of the part impacted by high-pressure water by an integral forming process and designing water passing holes at corresponding positions, so as to achieve the purpose of alleviating the impact and scouring of high-pressure water on this structure

[0025] Based on the above concept, the present utility model provides the following embodiments for illustration

[0026] A filtering device for water injection wells of the present utility model, as shown in Figure 1 and Figure 2As shown in the figure, it includes a multi-way pipe. The multi-way pipe has a water inlet 7 and a water outlet 6 that are coaxially and oppositely arranged, and also has a filter and sewage discharge pipe orifice 8 that is perpendicular to the orientations of the water inlet and outlet. In the inner cavity of the multi-way pipe, a diversion and commutation partition 5 is provided at the intersection position. The diversion and commutation partition 5 has a flow-through hole 55 that penetrates in the orientation direction of the filter and sewage discharge pipe orifice 8, so as to form a water flow channel in the inner cavity of the multi-way pipe for the water flowing in from the water inlet 7 to flow through the flow-through hole 55 after commutation, and then flow out from the water outlet 6 after commutation again. A first plugging member is detachably installed at the filter and sewage discharge pipe orifice 8. A filter pipe 2 is installed in the inner cavity of the multi-way pipe between the first plugging member and the diversion and commutation partition 5. The extending direction of the filter pipe 2 is the same as the extending direction of the flow-through hole 55. The water flowing out through the flow-through hole 55 flows into the filter pipe 2 and flows to the water outlet 6 after being filtered through the pipe wall of the filter pipe 2. The utility model provides a new filtering device for injection wells. It adopts a multi-way pipe structure, and a diversion and commutation partition 5 is arranged at the intersection of the inner cavity of the multi-way pipe. When in use, high-pressure water enters the multi-way pipe from the water inlet 7, flows into the filter pipe 2 through the flow-through hole 55 after commutation by the diversion and commutation partition 5, and flows to the water outlet pipe 6 after being filtered through the pipe wall of the filter pipe 2; after the high-pressure water is commuted multiple times by the diversion and commutation partition 5, the impact and scouring of the high-pressure water on the filter pipe are greatly weakened, so as to achieve the purpose of protecting the filter pipe from being damaged.

[0027] The utility model provides a more optimal embodiment. As Figure 2-4 shown in the figure, the diversion and commutation partition 5 includes a middle partition 51. The middle partition 51 extends perpendicular to the orientation of the filter and sewage discharge pipe orifice 8 and is located in the middle of the cross-section of the water inlet 7. The flow-through hole 55 is located on the middle partition 51; the diversion and commutation partition 5 further includes an inlet diversion partition 52 and an outlet diversion partition 53 at both ends of the middle partition 51. The inlet diversion partition 52 and the outlet diversion partition 53 both extend along the direction of the filter pipe 2. By designing the diversion and commutation partition 5 into a "Z" shape, when in use, high-pressure water enters the multi-way pipe through the water inlet 7, flows in the opposite direction of the filter and sewage discharge pipe orifice 8 after the first commutation by the inlet diversion partition 52 on the diversion and commutation partition 5, and then flows into the filter pipe 2 after the second commutation through the flow-through hole 55 on the diversion and commutation partition 5, and flows to the outlet pipe orifice 6 after being filtered through the pipe wall of the filter pipe 2. The filtered water flow flows to the water meter inlet.

[0028] In one embodiment, both the inlet diversion partition 52 and the outlet diversion partition 53 extend along the direction of the filter pipe 2 and are welded to the inner wall of the multi-way pipe. Welding the inlet diversion partition 52 and the outlet diversion partition 53 to the inner wall of the multi-way pipe can also achieve the corresponding filtering and commutation functions. The commutation alleviates the impact and scouring of the high-pressure water on the filter pipe 2 to a certain extent. However, in actual engineering, the water pressure is very high, and the formation injection pressure often reaches up to 6 Mpa. Only through commutation cannot completely reduce the impact and scouring of the high-pressure water on the filter pipe 2. For this reason, this application provides a more optimal embodiment. As Figure 2and Figure 3 As shown, both the inlet diversion partition 52 and the outlet diversion partition 53 are in the shape of a tile and are flush with the inner wall of the filter sewage discharge pipe 8. The manufacturing process of the inlet diversion partition 52, the outlet diversion partition 53 and the filter sewage discharge pipe 8 is integrally cast and formed in cooperation with the machining process. That is to say, the inlet diversion partition 52 and the outlet diversion partition 53 are integrally formed with the inner wall of the multi-way pipe. By manufacturing the multi-way pipe and the diversion reversing partition 5 through the integral forming process, the filtering device of the present application has strong compressive capacity and effectively reduces the impact force of high-pressure water during the water injection process.

[0029] The present application provides a more optimal embodiment. As shown in Figure 1 and Figure 2 As shown, the outer diameter of the filter tube 2 is equal to the inner diameter of the inlet diversion partition 52. The filter tube 2 is inserted into the inner cavity of the multi-way pipe from the filter sewage discharge pipe 8 and is pressed on the middle partition 51 by the first plugging member. By inserting the filter tube 2 into the inlet diversion partition 52 and plugging the other end with the first plugging member, the filter tube 2 is well fixed in the inlet diversion partition 52, and the filter tube 2 will not be displaced by the impact and scouring of water when high-pressure water is injected into the formation.

[0030] Based on the above embodiments, the filtering device for injection wells of the present utility model can not only solve the problem of the water meter being blocked but also protect the filter tube from being damaged by high-pressure impact. To further optimize the above embodiments, as shown in Figure 2 and Figure 3 As shown, in this embodiment, water passing holes 54 can be provided on the inlet diversion partition 52, or water passing holes 54 can be provided on the outlet diversion partition 53, or water passing holes 54 can be provided on both the inlet diversion partition 52 and the outlet diversion partition 53. By designing the water passing holes 54, part of the water flow flows out through the water passing holes 54 during the high-pressure water injection into the formation, which is beneficial to alleviating the impact and scouring force of the high-pressure water on the inlet diversion partition 52 and the outlet diversion partition 53, and protecting the inlet diversion partition 52 and the outlet diversion partition 53 from being deformed and damaged. Secondly, when the water injection into the formation is very urgent, the water passing holes 54 can also be used as filtering holes to filter the high-pressure water injected into the formation, increasing the filtering area of the entire filtering device.

[0031] The present application provides a more optimal embodiment. As shown in Figure 1 and Figure 5 As shown, the first plugging member is a sewage plug 3. A limiting boss 31 is provided on the inner end face of the sewage plug 3. The end of the filter tube 2 is sleeved outside the limiting boss 31 of the sewage plug 3. By sleeving the filter tube 2 on the limiting boss 31 of the sewage plug 3, it is more convenient and fast to disassemble and assemble the filter tube during sewage discharge. In other embodiments, the filter tube 2 and the sewage plug 3 are fixedly connected together and are integrally screwed into or out of the filter sewage discharge pipe 8 during use and removal.

[0032] In one embodiment, when the size of the filter tube 2 is different from that of the inner cavity of the multi-way pipe it is located in, specifically, the outer diameter of the filter tube 2 is smaller than the size of the inner cavity of the multi-way pipe it is located in. At this time, there is a certain gap between the filter tube 2 and the inner cavity wall of the multi-way pipe. The filter tube 2 is fixed in the inner cavity of the multi-way pipe by relying on the limiting boss 31. In order to increase the filtration area of the filter tube as much as possible and improve its stability at the same time, the present application provides a more optimal embodiment, such as Figure 1 shown, the size of the filter tube 2 is equal to that of the inner cavity of the multi-way pipe it is located in. By designing the outer diameter size of the filter tube 2 to be equal to the size of the inner cavity of the multi-way pipe, the inner cavity wall of the multi-way pipe can play a role in limiting and holding the filter tube.

[0033] In one embodiment, the multi-way pipe is designed as a three-way pipe, which are the water inlet pipe orifice 7, the water outlet pipe orifice 6, and the filter and sewage discharge pipe orifice 8 respectively. The filter tube 2 is inserted into the inner cavity of the three-way pipe from the filter and sewage discharge pipe orifice 8 and is pressed on the middle partition 51 by the sewage plug 3. When sewage discharge is required, first close the valves on the water inlet and outlet pipe orifices at the same time, then remove the sewage plug 3, and then take out the filter tube 2 to perform the sewage discharge operation. When there is not much impurity deposition, it is rather troublesome to perform the sewage discharge operation in the above manner. For this reason, the present application provides a more optimal embodiment, such as Figure 1 and Figure 2 shown, the multi-way pipe is a cross-shaped four-way pipe 1, and one end orifice facing away from the filter and sewage discharge pipe orifice 8 is the cleaning pipe orifice 9, and a second plugging member is detachably installed in the cleaning pipe orifice 9. When there is not much impurity deposition in the filter and sewage discharge pipeline, the second plugging member can be removed, the water valve at the water outlet pipe orifice 6 is closed, and the water valve at the water inlet pipe orifice 7 is opened. The water flows into the four-way pipe 1 through the water inlet pipe orifice 7 and takes out the small amount of impurities in the filter and sewage discharge pipeline from the cleaning pipe orifice 9 to achieve impurity cleaning. The impurity cleaning operation is simple and convenient in this way, and the filter tube 2 will not move during the impurity cleaning. When there is a lot of impurity deposition or even blockage in the filter and sewage discharge pipeline, the impurities cannot be completely cleaned out by the above method. At this time, it is necessary to close the water valves at the water inlet and outlet orifices at the same time, open the sewage plug 3, and take out the filter tube 2 for manual cleaning of the impurities to clean the impurities completely.

[0034] In one embodiment, the second plugging member is a blind plate, and the cleaning pipe orifice 9 can be plugged by setting the blind plate to achieve the corresponding impurity cleaning. The present application provides another more optimal embodiment, and the second plugging member is a cleaning plug 4. By designing the second plugging member as a cleaning plug, it has a good sealing effect, and it is more convenient and fast to screw in and out by threads during disassembly.

[0035] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A filtering device for injection wells, characterized in that, It includes a multi-way pipe. The multi-way pipe has a water inlet and a water outlet which are coaxially arranged in opposite directions, and also has a filter and sewage discharge pipe opening perpendicular to the orientations of the water inlet and outlet. A flow guiding and reversing partition is provided at the intersection position in the inner cavity of the multi-way pipe. The flow guiding and reversing partition has a flow through hole that penetrates in the orientation direction of the filter and sewage discharge pipe opening, so as to form a water flow channel in the inner cavity of the multi-way pipe for the water flowing in from the water inlet to flow through the flow through hole after being reversed, and then flowing out from the water outlet after being reversed again. A first plugging member is detachably installed at the filter and sewage discharge pipe opening. A filter pipe is installed in the inner cavity of the multi-way pipe between the first plugging member and the flow guiding and reversing partition. The extending direction of the filter pipe is the same as that of the flow through hole. The water flowing out through the flow through hole flows into the filter pipe and flows to the water outlet after being filtered by the pipe wall of the filter pipe.

2. The water injection well filtering device according to claim 1, characterized in that, The flow guiding and reversing partition includes a middle partition. The middle partition extends perpendicular to the orientation of the filter and sewage discharge pipe opening and is located in the middle of the cross-section of the water inlet. The flow through hole is located on the middle partition. The flow guiding and reversing partition also includes an inlet flow guiding partition and an outlet flow guiding partition at both ends of the middle partition. The inlet flow guiding partition and the outlet flow guiding partition both extend along the direction of the filter pipe.

3. The injection well filtering device according to claim 2, characterized in that, The inlet flow guiding partition is in a tile shape and is flush with the inner wall of the filter and sewage discharge pipe opening. The outer diameter of the filter pipe is equal to the inner diameter of the inlet flow guiding partition. The filter pipe is inserted into the inner cavity of the multi-way pipe from the filter and sewage discharge pipe opening and is pressed against the middle partition by the first plugging member.

4. The injection well filtering device according to claim 3, characterized in that, The first plugging member is a sewage plug. A limiting boss is provided on the inner end face of the sewage plug. The end of the filter pipe is sleeved outside the limiting boss of the sewage plug.

5. The injection well filtering device according to claim 4, characterized in that, The size of the filter pipe is equal to that of the inner cavity of the multi-way pipe where it is located.

6. The injection well filtering device according to claim 2, characterized in that, The outlet flow guiding partition is in a tile shape and is flush with the inner wall of the filter and sewage discharge pipe opening.

7. The injection well filtration device according to any one of claims 2-6, characterized in that The inlet flow guiding partition and / or the outlet flow guiding partition is provided with a water passing hole.

8. The injection well filtering device according to any one of claims 1-6, characterized in that, The multi-way pipe is a cross-shaped four-way pipe. One end opening facing away from the filter and sewage discharge pipe opening is a cleaning pipe opening, and a second plugging member is detachably installed in the cleaning pipe opening.

9. The injection well filtering device according to claim 8, characterized in that, The second plugging member is a cleaning plug.

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