Oilfield well flushing fluid filtration device

Abstract

The utility model discloses an oilfield well washing fluid filtering device, including filter box, be provided with filter plate in the filter box, the lower extreme of filter plate is connected with the bottom wall in filter box, the filter plate is in front -back direction and is in proper order for the front end, the angle, the back end, the front end is connected with the inner front wall of filter box, the back end is connected with the inner side wall of filter box, the filter plate is set up filter hole between the front end, the angle, the part of filter box in the angle is the liquid inlet chamber, the part of filter box outside the angle is the liquid outlet chamber. The utility model can prevent sundries from entering the well, improve well washing quality, ensure that oil -water well can long -term normal production, can improve well repairing quality when being used for well repairing operation, avoid sundries and block the formation, prevent oil layer pollution.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically to an oilfield well washing fluid filtration device. Background Technology

[0002] When production anomalies occur during oil well production, the most common method to eliminate them is well washing. This involves injecting washing fluid into the casing, through the bottom of the tubing string, and back to the surface. Well washing removes sand, wax, scale, and other substances that affect production from the wellbore and tubing, potentially restoring the well to normal operation. Some wax-laden wells and heavy oil wells maintain production through periodic well washing (known on-site as hot washing), and water injection wells also have periodic washing regulations. Well washing is also a procedure during oil and water well workover operations. When well pressure is high, washing fluid is injected to prevent blowouts. Therefore, large quantities of washing fluid need to be injected into wells during oilfield production and workover. Currently, the washing fluid used is generally oilfield water separated from produced fluid at the oil gathering station, transported by tanker trucks to the well site, and then pumped into the well using cement pump trucks. The well-washing fluid becomes contaminated during multiple transfers, mixing with a lot of debris. If this debris is injected into the well, it will clog the formation, causing oil layer pollution and seriously affecting the production and water injection of oil and water wells. On the other hand, after the debris enters the downhole tools, due to the complex flow channels of the downhole tools, the debris will remain inside, causing the downhole tools to malfunction, such as the valve ball of the oil pump not being able to open and close normally.

[0003] Announcement No. CN217757106U discloses an oilfield water injection filtration device, including a housing. Both sides of the inner cavity of the housing are fixedly connected to partitions, and a first valve body is fixedly connected between the two partitions. A filter plate, an activated carbon filter screen, and an ultrafiltration membrane filter screen are sequentially fixedly connected to the bottom of the inner cavity and the displacement partitions. A first motor is fixedly connected to the top of the housing, and a stirring rod is fixedly connected to the output end of the first motor.

[0004] When this existing technology is in use, impurities continuously deposit on the filter plate, which creates a throttling effect and affects the flow rate.

[0005] Announcement No. CN219558949U discloses an oil production sand control device, including a sand control component. The sand control component includes: a housing three with an oil inlet pipe on its side; an oil outlet pipe on one side of the housing three; a filter plate installed inside the housing three, with at least one; and a discharge pipe on the outer wall of the housing three, with at least one. During oil production, when the oil is filtered through the filter plate, the motor is turned on, causing the rod to drive the brush to rotate and clean the filter plate. The cleaned sand and gravel fall into the discharge pipe. After closing the valve on the discharge pipe, the sealing cover at the bottom of the discharge pipe can be opened to clean the sand and gravel inside the discharge pipe. This ensures that the filter plate is continuously cleaned while the oil is being filtered during oil production, preventing the filter plate from being blocked by sand and gravel, which would affect the normal transportation of oil, and facilitating the cleaning of sand and gravel in the discharge pipe.

[0006] When the prior art is in use, impurities impact the filter plate with high kinetic energy, and some impurities will flush the filter plate. The filtration effect of the prior art is not as good as that of this patent.

[0007] Publication No. CN116422037A discloses a fluid filtration device, system, and method of use. The fluid filtration device includes a filter cylinder, a filter plate assembly, a filter inlet, and a filter outlet disposed on the filter cylinder. The filter plate assembly includes at least two filter plates, which are sequentially and obliquely placed in the filter cylinder from the filter inlet to the filter outlet. The angle between the filter surface of the at least two filter plates and the horizontal plane is an acute angle, so that the filtered impurities directly reach the bottom of the filter cylinder and do not accumulate on the filter plates.

[0008] When the prior art is in use, impurities impact the filter plate with high kinetic energy, and some impurities will flush the filter plate. The filtration effect of the prior art is not as good as that of this patent.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides an oilfield well washing fluid filtration device.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] An oilfield well-washing fluid filtration device includes a filter box, a filter plate disposed inside the filter box, and the lower end of the filter plate being connected to the bottom wall of the filter box. The filter plate has a front end, a bend, and a rear end in the front-to-back direction. The front end is connected to the inner front wall of the filter box, and the rear end is connected to the inner side wall of the filter box. Filter holes are provided between the front end and the bend in the filter plate. The portion of the filter box inside the bend is the inlet chamber, and the portion of the filter box outside the bend is the outlet chamber.

[0013] Furthermore, the filter box is connected to a cleaning mechanism;

[0014] Specifically, the cleaning mechanism includes a support adjustment rod and a debris removal component;

[0015] Specifically, the filter plate has support holes between the front end and the bend.

[0016] Specifically, the support adjustment rod rotates into the filter box, the support adjustment rod is connected to the filter box through a sealing assembly, and the support adjustment rod rotates through the support hole;

[0017] Specifically, the support adjustment rod has a drive handle on the portion outside the filter box;

[0018] Specifically, the support adjustment rod is connected to a cleaning component inside the liquid inlet chamber. The cleaning component can contact the filter holes, and the cleaning component can rotate around the support adjustment rod to completely cover the filter holes.

[0019] Furthermore, the filter box is connected to an inlet connector, an outlet connector, and a drain connector;

[0020] Specifically, the inlet connector is connected to the liquid inlet chamber, and the projection of the axis of the inlet connector and the axis of the filter hole on the bottom surface of the filter box intersects.

[0021] Specifically, the drain connector is connected to the liquid inlet chamber and is located on the bottom wall of the filter box;

[0022] Specifically, the outlet connector is connected to the liquid outlet chamber and is located on the rear wall of the filter box.

[0023] Furthermore, the filter box is a square box, and the drain connector is connected to a valve.

[0024] Furthermore, the sealing assembly includes a support tube and a sealing cap;

[0025] Specifically, the support adjustment rod is provided with an optical axis section and a threaded section;

[0026] Specifically, the optical axis segment passes through the filter box and through the support hole;

[0027] Specifically, the support tube is sleeved on the optical axis section located outside the filter box. The support tube is connected to the filter box. A sealing groove is provided on the inner wall of the end of the support tube away from the filter box. A sealing element is filled between the sealing groove and the support adjustment rod. A sealing cap is connected to the end of the sealing groove away from the filter box. The sealing cap presses the sealing element.

[0028] Specifically, the threaded section is located outside the filter box, and an adjusting nut is threaded onto the threaded section.

[0029] Furthermore, the filter holes are arranged in a multi-layered circumferential array with the center of the support hole as the center;

[0030] Specifically, the cleaning component includes a cleaning plate, the center of which is connected to the optical axis section of the support adjustment rod, the length of which is greater than the outer diameter of the multi-layer circumferential array filter holes, and the end face of the cleaning plate facing the filter holes is provided with bristles.

[0031] Furthermore, the support adjustment rod passes through the filter box wall corresponding to the liquid inlet chamber.

[0032] Furthermore, the sealing element is a packing material.

[0033] Furthermore, the drive handle is located at the end of the threaded section away from the optical axis section, and the drive handle is a wrench handle.

[0034] Furthermore, a cover is provided at the top of the filter box, the upper surface of the filter plate is flush with the upper surface of the filter box, and the cover and the filter box are sealed with sealing strips.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. This utility model is installed on the well washing pipeline. After the well washing fluid injected into the well flows through this utility model, the impurities in the well fluid are filtered out, and the well washing fluid injected into the well is a cleaning fluid. Therefore, this utility model can prevent impurities from entering the well, improve the quality of well washing, ensure that oil and water wells can produce normally for a long time, and improve the quality of well repair operations when used for well repair operations, avoid impurities clogging the formation, and prevent oil layer pollution.

[0037] 2. This utility model allows the cleaning plate to be brought closer to the filter plate by rotating the adjusting nut, and the debris blocked by the filter plate can be dislodged by rotating the support adjusting rod. Then, high-pressure water is used to backwash the impurities through the outlet connector to the sewage discharge connector. Therefore, this utility model can clean the dirt without opening the inside, which is very convenient to use, has good practicality, and has significant economic and social benefits. Attached Figure Description

[0038] Figure 1This is a top view schematic diagram of the internal structure of an oilfield well washing fluid filtration device according to this utility model.

[0039] Figure 2 This is a schematic diagram of the external front view of an oilfield well washing fluid filtration device according to this utility model.

[0040] Figure 3 This is a schematic diagram of the filter plate in this utility model.

[0041] In the diagram: 1. Inlet connector; 2. Filter box; 3. Cleaning component; 4. Filter plate; 4-1. Filter hole; 4-2. Support hole; 5. Outlet connector; 6. Drain connector; 7. Support pipe; 8. Sealing cap; 9. Sealing component; 10. Adjusting nut; 11. Support adjusting rod; 11-1. Drive handle; 12. Box cover; 13. Liquid inlet chamber; 14. Liquid outlet chamber. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Example 1:

[0044] Please see Figures 1 to 3 This utility model provides an oilfield well washing fluid filtration device, including a filter box 2, a filter plate 4 disposed inside the filter box 2, the lower end of the filter plate 4 being connected to the inner bottom wall of the filter box 2, the filter plate 4 having a front end, a bend, and a rear end in the front-to-back direction, the front end being connected to the inner front wall of the filter box 2, and the rear end being connected to the inner side wall of the filter box 2, the filter plate 4 having a filter hole 4-1 between the front end and the bend, the portion of the filter box 2 inside the bend being an inlet chamber 13, and the portion of the filter box 2 outside the bend being an outlet chamber 14, the filter box 2 being connected to a cleaning mechanism, the cleaning component 3 of the cleaning mechanism being able to contact the filter hole 4-1 in the inlet chamber 13; impurities in the liquid in the inlet chamber 13 are deposited under gravity and blocked by the filter hole 4-1 of the filter plate 4, so that the liquid entering the outlet chamber 14 is a cleaning fluid.

[0045] Specifically, the filter box 2 is a square box.

[0046] Specifically, the filter box 2 is connected to an inlet connector 1, an outlet connector 5, and a drain connector 6. The inlet connector 1 is connected to the inlet chamber 13, and the projection of the axis of the inlet connector 1 and the axis of the filter hole 4-1 on the bottom surface of the filter box 2 intersects, preferably perpendicularly. The drain connector 6 is connected to the inlet chamber 13 and is located on the bottom wall of the filter box 2. The outlet connector 5 is connected to the outlet chamber 14 and is located on the rear wall of the filter box 2. Well fluid enters the inlet chamber 13 from the inlet connector 1. The space becomes larger and the flow rate slows down. Impurities in the liquid are deposited under the action of gravity and blocked by the filter holes 4-1 of the filter plate 4, so that the liquid entering the outlet chamber 14 is a cleaning liquid, which is then discharged through the outlet connector 5 for use. During cleaning, cleaning liquid is returned through the outlet connector 5 to flush the filter holes 4-1, and the sediment at the bottom of the inlet chamber 13 is discharged through the drain connector 6.

[0047] Specifically, the drain connector 6 is connected to a valve for easy cleaning.

[0048] Specifically, the bend angle is a 90° bend angle. By bend angle and the axis of inlet connector 1 being perpendicular to the axis of filter hole 4-1, the direction of liquid flow changes. Impurities are confined in the liquid inlet chamber 13 under the action of inertia and then deposited at the bottom of the liquid inlet chamber 13.

[0049] Furthermore, the cleaning mechanism includes a support adjustment rod 11 and a cleaning component 3. The filter plate 4 has a support hole 4-2 between its front end and the bend. The support adjustment rod 11 rotates and passes through the filter box 2. The support adjustment rod 11 and the filter box 2 are connected by a sealing assembly. The support adjustment rod 11 rotates through the support hole 4-2. The part of the support adjustment rod 11 outside the filter box 2 has a drive handle 11-1. The support adjustment rod 11 is connected to the cleaning component 3 in the liquid inlet chamber 13. The cleaning component 3 can contact the filter hole 4-1. The cleaning component 3 can completely cover the filter hole 4-1 when it rotates around the support adjustment rod 11 for one revolution.

[0050] Specifically, the filter holes 4-1 are arranged in a multi-layered circular array with the support hole 4-2 as the center.

[0051] Specifically, the support adjustment rod 11 passes through the wall of the filter box 2 corresponding to the liquid inlet chamber 13.

[0052] Specifically, the sealing assembly includes a support tube 7 and a sealing cap 8. The support adjusting rod 11 is provided with a smooth axis section and a threaded section. The smooth axis section passes through the filter box 2 and through the support hole 4-2. The support tube 7 is sleeved on the smooth axis section located outside the filter box 2. The support tube 7 is welded to the filter box 2. A sealing groove is provided on the inner wall of the end of the support tube 7 away from the filter box 2. A sealing element 9 is filled between the sealing groove and the support adjusting rod 11. The sealing cap 8 is connected to the end of the sealing groove away from the filter box 2. The sealing cap 8 presses the sealing element 9 so that the liquid in the liquid inlet chamber 13 cannot flow out from the support tube 7. An adjusting nut 10 is threadedly connected to the threaded section. The distance between the cleaning element 3 and the filter plate 4 can be adjusted by rotating the adjusting nut 10.

[0053] Specifically, the sealing element 9 is a packing material. By compressing the packing, the packing expands and squeezes the optical axis section or threaded section of the support adjustment rod 11 to achieve the sealing function.

[0054] Specifically, the drive handle 11-1 is located at the end of the threaded section away from the optical axis section. The drive handle 11-1 is a wrench-shaped clamp. The cleaning component 3 is rotated by rotating the support adjustment rod 11 through the drive handle 11-1.

[0055] Specifically, the cleaning component 3 includes a cleaning plate. The center of the cleaning component 3 is connected to the optical axis section of the support adjustment rod 11 by a thread and positioned by a step. The length of the cleaning component 3 is greater than the maximum diameter of the multi-layer circumferential array filter holes. The cleaning component 3 can rotate to completely cover all filter holes 4-1. The end face of the cleaning plate facing the filter holes 4-1 is provided with bristles.

[0056] Furthermore, a cover 23 is provided at the upper end of the filter box 2, and the upper end face of the filter plate 4 is flush with the upper end face of the filter box 2, so that after the cover 23 is installed, the liquid inlet chamber 13 and the liquid outlet chamber 14 in the filter box 2 are connected only through the filter hole 4-1. The cover 23 and the filter box 2, and the cover 23 and the filter plate 4 are sealed with rubber strips.

[0057] Example 2:

[0058] Based on Example 1, a method for using an oilfield well-washing fluid filtration device in well-washing operations includes the following steps:

[0059] Step 1: Connect the inlet and outlet ports of the well washing fluid filtration device to the front end ports of the plunger pumps of the well washing water tanker and the pump truck; specifically, connect the inlet connector 1 to the bottom outlet of the well washing water tanker through a pipe universal joint, and connect the outlet connector 5 to the inlet of the plunger pump of the pump truck through a pipe universal joint.

[0060] Step 2: During normal well washing, the outlet gate of the well washing water tanker is opened. The well washing fluid enters the filter box 2 of the filter device for filtration, and then enters the pump truck process. It is pressurized by the plunger pump and enters the oil well casing for well washing. During the entire well washing process, impurities in the well washing fluid are filtered out and will not enter the oil well, thus improving the quality of well washing.

[0061] Step 3: During the well cleaning process, when the filter holes 4-1 on the filter plate 4 are blocked by debris, the cleaning component 3 is brought close to the filter holes 4-1 by rotating the adjusting nut 10. The cleaning component 3 is then cleaned by rotating the support adjusting rod 11 through the drive handle 11-1. The impurities fall into the bottom of the filter box 2, ensuring that the filter holes 4-1 are unobstructed and do not cause throttling.

[0062] Step 4: After the well is cleaned, the filter device is disassembled. The filter hole 4-1 is cleaned by rotating the support adjustment rod 11 to drive the cleaning part 3. The impurities fall into the bottom of the filter box 2. After cleaning, high pressure water can enter from the outlet connector 5. The sewage and impurities in the filter box 2 are discharged into the sewage collection container through the sewage discharge connector 6 using the backwashing principle to avoid pollution when disassembling the device cover 12. The operation is completed.

[0063] Example 3:

[0064] Based on Example 1, a method for using an oilfield well-washing fluid filtration device for water injection operation includes the following steps:

[0065] Step 1: Connect the inlet and outlet ports of the well cleaning fluid filter device to the inlet pipeline of the water injection pump; specifically, connect inlet connector 1 to the inlet pipeline through a pipe universal joint, and connect outlet connector 5 to the inlet of the water injection pump through a pipe universal joint.

[0066] Step 2: After the low-pressure injection water enters the filter box 2 of the filter device for filtration, it enters the water injection pump for pressurization. During the entire injection process, impurities in the injection water are filtered out and will not enter the well, thus improving the quality of the injection water.

[0067] Step 3: During the well cleaning process, when the filter holes 4-1 on the filter plate 4 are blocked by debris, the cleaning component 3 is brought close to the filter holes 4-1 by rotating the adjusting nut 10. The cleaning component 3 is then cleaned by rotating the support adjusting rod 11 through the drive handle 11-1. The impurities fall into the bottom of the filter box 2, ensuring that the filter holes 4-1 are unobstructed and do not cause throttling.

[0068] Step 4: After the injection is completed, remove the filter device and use the rotating support adjustment rod 11 to drive the cleaning part 3 to clean the filter hole 4-1. The impurities fall into the bottom of the filter box 2. After cleaning, high pressure water can enter from the outlet connector 5 and the sewage impurities in the filter box 2 can be discharged into the sewage collection container through the sewage discharge connector 6 using the backwashing principle. This avoids pollution when removing the device cover 12 and completes the operation.

[0069] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0070] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0071] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0072] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oilfield well flushing fluid filtering device comprising a filter box, a filter plate is arranged in the filter box, characterized in that, The lower end of the filter plate is connected to the bottom wall of the filter box; The filter plate consists of a front end, a bend, and a rear end in the front-to-back direction. The front end is connected to the inner front wall of the filter box, the rear end is connected to the inner side wall of the filter box, and the filter plate has filter holes between the front end and the bend. The portion of the filter box inside the bend is the inlet chamber, and the portion outside the bend is the outlet chamber.

2. The oilfield well-washing fluid filtration device according to claim 1, characterized in that, The filter box is connected to the cleaning mechanism; The cleaning mechanism includes a support adjustment rod and a debris removal component; The filter plate has support holes between its front end and the corner. The support adjustment rod rotates and passes through the filter box, and the support adjustment rod is connected to the filter box through a sealing assembly. The support adjustment rod rotates and passes through the support hole. The support adjustment rod has a drive handle on the part outside the filter box; The support adjustment rod is connected to a cleaning component inside the liquid inlet chamber. The cleaning component can contact the filter holes, and the cleaning component can completely cover the filter holes when rotated around the support adjustment rod.

3. The oilfield well-washing fluid filtration device according to claim 2, characterized in that, The filter box is connected to an inlet connector, an outlet connector, and a sewage discharge connector. The inlet connector is connected to the liquid inlet chamber, and the projection of the axis of the inlet connector and the axis of the filter hole on the bottom surface of the filter box intersects. The drain connector is connected to the liquid inlet chamber and is located on the bottom wall of the filter box; The outlet connector is connected to the liquid outlet chamber and is located on the rear wall of the filter box.

4. A well flushing fluid filter apparatus as claimed in claim 3, wherein, The filter box is a square box, and the drain connector is connected to a valve.

5. The oilfield well-washing fluid filtration device according to claim 3, characterized in that, The sealing assembly includes a support tube and a sealing cap; The support adjustment rod is provided with an optical axis section and a threaded section; The optical axis segment passes through the filter box and through the support hole; The support tube is sleeved on the optical axis section located outside the filter box. The support tube is connected to the filter box. A sealing groove is provided on the inner wall of the end of the support tube away from the filter box. A sealing element is filled between the sealing groove and the support adjustment rod. A sealing cap is connected to the end of the sealing groove away from the filter box. The sealing cap presses the sealing element. The threaded section is located outside the filter box, and an adjusting nut is threaded onto the threaded section.

6. The oilfield well-washing fluid filtration device according to claim 5, characterized in that, The filter holes are arranged in a multi-layered circular array with the center of the support hole as the center; The cleaning component includes a cleaning plate, the center of which is connected to the optical axis section of the support adjustment rod, the length of which is greater than the outer diameter of the multi-layer circumferential array filter holes, and the end face of the cleaning plate facing the filter holes is provided with bristles.

7. The oilfield well-washing fluid filtration device according to claim 2, characterized in that, The support adjustment rod passes through the filter box wall corresponding to the liquid inlet chamber.

8. The oilfield well-washing fluid filtration device according to claim 5, characterized in that, The sealing element is a packing material.

9. The oilfield well-washing fluid filtration device according to claim 5, characterized in that, The drive handle is located at the end of the threaded section away from the optical axis section, and the drive handle is a wrench handle.

10. The oilfield well-washing fluid filtration device according to claim 1, characterized in that, The filter box is provided with a cover at the top, and the upper surface of the filter plate is flush with the upper surface of the filter box. The cover and the filter box, as well as the cover and the filter plate, are sealed with sealing strips.

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