A water injection device for oil and gas field development

Abstract

The utility model discloses a water injection unit for oil and gas field development, including drain pipe, the bottom of drain pipe is fixed with first groove board, the left side insertion of first groove board has the second groove board, the inside fixed support board of second groove board, the lateral wall of support board is provided with filter piece, the outer wall of second groove board has set up the sliding slot, just the inside sliding connection of sliding slot has the rotating block, the outside fixed of rotating block has the fixed sleeve pipe. After three filters preliminary separation oil and water, water flow passes through filter core and filter oil piece's double filtration in proper order, and filter core adopts the multilayer composite structure of polyester fibre layer, activated carbon layer and glass fibre layer, can high -efficient intercepts the impurity in water, and filter oil piece adopts polypropylene fibre multilayer folding design, utilizes surface tension adsorption tiny oil drop, and the symmetrical distribution of cooperation limit piece ensures that filter piece stable operation, significantly reduces the oil content and impurity content in water, satisfies the strict requirement of oil and gas field water injection to water quality.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field development technology, specifically to a water injection device for oil and gas field development. Background Technology

[0002] In the process of oil and gas field development, water injection is a key link to maintain reservoir pressure and improve recovery rate. Its core is to inject treated water stably and cleanly into the underground reservoir. At present, the industry generally uses three filters to perform preliminary oil-water separation treatment on oil and gas field wastewater, and then transports the separated water to the water injection pipeline through the drainage pipe to finally complete the water injection operation. However, existing water injection devices have significant technical defects in practical applications: On the one hand, tiny oil droplets may still remain in the water after separation by the three-stage filter. Due to their small particle size, these oil droplets are difficult to completely remove by conventional separation methods. As the water flows into the water injection pipeline, they tend to adhere and deposit on the pipe wall. Long-term operation can lead to a reduction in the flow cross-section of the pipeline, or even cause local blockage, affecting the water injection efficiency. On the other hand, during the drainage process of the three-stage filter, the impact of the water flow can easily lift up solid impurities deposited at the bottom of the filter. These impurities, after entering the water injection pipe with the water flow, can be trapped by pipe bends, valves, and other structures, gradually causing blockage inside the water injection pipe. Once a blockage occurs, not only does it require shutdown for pipeline cleaning, increasing maintenance costs and downtime, but it may also cause pipeline damage due to a sudden increase in local pressure, posing a safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a water injection device for oil and gas field development to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a water injection device for oil and gas field development, comprising a drain pipe, a first groove plate fixed to the bottom end of the drain pipe, a second groove plate inserted into the left side of the first groove plate, a support plate fixed inside the second groove plate, a filter element provided on the side wall of the support plate, a sliding groove provided on the outer wall of the second groove plate, and a rotating block slidably connected inside the sliding groove, a fixing sleeve fixed to the outer side of the rotating block, a connecting plate threadedly connected to the inner wall of the fixing sleeve, and the unthreaded side of the connecting plate connected to the outer wall of the first groove plate, and a support element provided on the left side of the second groove plate.

[0005] Preferably, a sealing ring is machined at the connection between the first groove plate and the second groove plate.

[0006] Preferably, a threaded hole is provided at the center of the support plate.

[0007] Preferably, the filter element includes a fixing rod, which is threadedly connected to the inside of the support plate. A support rod is fixed to the right side of the fixing rod, and a filter element is rotatably connected to the outer wall of the support rod. An oil filter element is provided on the left side of the filter element, and the inner side of the oil filter element is rotatably connected to the support rod. Limiting blocks are fixed to the outer walls of both the filter element and the oil filter element, and the limiting blocks are inserted into the inside of the second groove plate.

[0008] Preferably, the oil filter element is composed of polypropylene fibers, which can effectively adsorb and filter tiny oil particles in the water.

[0009] Preferably, the support includes a flexible hose, which is fixed to the left side of the second groove plate. A water injection pipe is fixed to one end of the flexible hose away from the second groove plate. Insert rods are symmetrically fixed on both sides of the outer wall of the water injection pipe. A sleeve is sleeved on the outer wall of the insert rod, and the inner side of the sleeve is connected to the outer wall of the second groove plate.

[0010] Preferably, one side of the outer wall of the insertion rod is threaded, and after being inserted into the sleeve, the insertion rod can be limited and fixed by a nut.

[0011] Compared with the prior art, the beneficial effects of this utility model are: After initial separation of oil and water by three filters, the water flows through a dual filtration process involving a filter element and an oil filter element. The filter element adopts a multi-layer composite structure consisting of a polyester fiber layer, an activated carbon layer, and a glass fiber layer, which can efficiently intercept impurities in the water. The oil filter element adopts a multi-layer folded design of polypropylene fiber, which uses surface tension to adsorb tiny oil droplets. Combined with the symmetrical distribution of limiting blocks, it ensures stable operation of the filter element, significantly reducing the oil content and impurity content in the water, and meeting the stringent water quality requirements for water injection in oil and gas fields. The first and second slot plates adopt a plug-in design, which enables quick disassembly and assembly through the threaded connection of the rotating block, the fixing sleeve and the connecting plate. Combined with the sealing ring, the connection is sealed. The filter element is threaded to the support plate through the fixing rod. The filter element and oil filter can be taken out as a whole with the support rod. Cleaning or replacement can be completed without disassembling the whole device, which greatly shortens the maintenance time and reduces the difficulty of operation. The second groove plate slides and rotates together, allowing the fixed sleeve position to be adjusted according to connection requirements, adapting to different installation scenarios; the flexible hose in the support component enables the water injection pipe to have angle adjustment capability, and the telescopic structure of the insertion rod and sleeve facilitates the adjustment of the relative position of the water injection pipe and the groove body, improving the installation flexibility of the device under complex working conditions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Detailed view of the connection structure in cross-section; Figure 3 for Figure 2 Detailed view of the connection structure of the right-side cross-section of the central support plate; Figure 4 for Figure 2 Detailed view of the connection structure of the right side section of the second groove plate.

[0013] In the diagram: 1. Drain pipe, 2. First trough plate, 3. Second trough plate, 4. Support plate, 5. Fixing rod, 6. Support rod, 7. Filter element, 8. Oil filter element, 9. Limiting block, 10. Rotating block, 11. Fixing sleeve, 12. Connecting plate, 13. Hose, 14. Water injection pipe, 15. Insert rod, 16. Sleeve. Detailed Implementation

[0014] 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.

[0015] Please see Figure 1-4 This utility model provides a technical solution for a water injection device for oil and gas field development: A water injection device for oil and gas field development includes a drain pipe 1, with a three-stage filter connected to the top of the drain pipe 1. After the three-stage filter separates oil and water, water is discharged from the drain pipe 1. A valve is installed on the outer wall of the drain pipe 1. A first groove plate 2 is fixed to the bottom end of the drain pipe 1, and the first groove plate 2 is connected to the bottom end of the drain pipe 1 to form a preliminary water flow channel. A second groove plate 3 is inserted into the left side of the first groove plate 2. The second groove plate 3 is adapted to the specifications of the first groove plate 2 and forms a cavity structure inside to accommodate a support plate 4 and filter elements. The support plate 4 is fixed inside the second groove plate 3 and welded to the inner wall of the second groove plate 3 to form an installation support structure for the filter elements, which are distributed in a ring array. To ensure smooth flow of filtered water, a filter element is provided on the side wall of the support plate 4. A sliding groove is provided on the outer wall of the second trough plate 3, and a rotating block 10 is slidably connected inside the sliding groove. The rotating block 10 can slide up and down in the sliding groove, which facilitates threaded connection with the connecting plate 12. After connecting and fixing the first trough plate 2 and the second trough plate 3, a fixing sleeve 11 is fixed on the outer side of the rotating block 10. The inner wall of the fixing sleeve 11 is threadedly connected to the connecting plate 12, and the unthreaded side of the connecting plate 12 is connected to the outer wall of the first trough plate 2. The connecting plate 12 is a metal strip, and one end is machined with an external thread that matches the fixing sleeve 11. A support element is provided on the left side of the second trough plate 3. A sealing ring is machined at the connection between the first trough plate 2 and the second trough plate 3. A threaded hole is provided at the center of the support plate 4.

[0016] The filter element includes a fixing rod 5, which is threaded into the inside of the support plate 4. A support rod 6 is fixed to the right side of the fixing rod 5. The length of the support rod 6 matches the total length of the filter element 7 and the oil filter element 8 to ensure that both can be fully supported. The filter element 7 is rotatably mounted on the outer wall of the support rod 6. The filter element 7 is made of multi-layer composite filter material, consisting of a polyester fiber layer, an activated carbon layer, and a glass fiber layer from the inside out, which can perform preliminary filtration. An oil filter element 8 is set on the left side of the filter element 7. The oil filter element 8 is made of polypropylene fiber through a special process and adopts a multi-layer folded structure to increase the contact area with the water flow. It adsorbs tiny oil droplets in the water through surface tension. The inner side of the oil filter element 8 is rotatably connected to the support rod 6. Limiting blocks 9 are fixed to the outer walls of both the filter element 7 and the oil filter element 8. Four limiting blocks 9 are evenly distributed on each filter element in a symmetrical distribution to ensure that the filter element is evenly stressed after installation and will not tilt. The limiting blocks 9 are inserted into the inside of the second groove plate 3. The oil filter element 8 is composed of polypropylene fiber and can effectively adsorb and filter tiny oil particles in the water.

[0017] The support includes a hose 13, which is fixed to the left side of the second groove plate 3. A water injection pipe 14 is fixed to the end of the hose 13 away from the second groove plate 3. The water injection pipe 14 is used to transport the filtered oil to the underground oil layer. Insert rods 15 are symmetrically fixed on both sides of the outer wall of the water injection pipe 14. After the insert rods 15 are inserted into the inside of the sleeve 16, they can be limited and supported. The sleeve 16 is sleeved on the outer wall of the insert rod 15, and the inner side of the sleeve 16 is connected to the outer wall of the second groove plate 3. One side of the outer wall of the insert rod 15 is threaded. After being inserted into the inside of the sleeve 16, the insert rod 15 can be limited and fixed by a nut.

[0018] Working Principle: When a water injection device for oil and gas field development is first put into use, after the wastewater has been separated by three filters, the water enters the interior of the first tank plate 2 and the second tank plate 3 through the drain pipe 1. The filter element 7 can perform preliminary filtration of impurities in the water. Then, the special material of the oil filter element can adsorb and filter the tiny oil particles in the water. The filtered water enters the interior of the water injection pipe 14 through the hose 13 and is then transported to the underground oil layer or the water storage tank. When it is necessary to clean and replace the filter element 7 and the oil filter element 8, the user first removes the nut on the outer wall of the insertion rod 15, and then rotates the fixing sleeve 11. When rotating, the slider 10 rotates simultaneously to limit the fixing sleeve 11. The fixing sleeve 11 is threadedly connected to the connecting plate 12. When rotating, it drives the second tank plate 3 to move to the left. During the movement, the sleeve 16 moves on the outer wall of the insertion rod 15. After the first groove plate 2 and the second groove plate 3 are separated to a suitable position, the user rotates the support rod 6. When rotating, the fixed rod 5 rotates simultaneously and rotates out from inside the support plate 4. Then, the user pulls the filter element 7 and oil filter element 8 to the right through the support rod 6 and removes them from inside the second groove plate 3 for replacement or cleaning. After replacement, the user inserts the fixed rod 5 into the threaded hole of the support plate 4 and rotates it. After the support rod 6 and the fixed rod 5 are connected to the support plate 4, the filter element 7 and oil filter element 8 can be fixed and supported. Then, the user pulls the second groove plate 3 to the right to make the fixed sleeve 11 fit with the connecting plate 15. Then, the fixed sleeve 11 is rotated. When rotating, it is threadedly connected to the connecting plate 15 and moves to the right, which also makes the second groove plate 3 move to the right at the same time until the first groove plate 2 and the second groove plate 3 are fitted together and then the rotation stops.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water injection device for oil and gas field development, comprising a drain pipe (1), characterized in that, The bottom end of the drain pipe (1) is fixed with a first groove plate (2), and a second groove plate (3) is inserted into the left side of the first groove plate (2). A support plate (4) is fixed inside the second groove plate (3). A filter element is provided on the side wall of the support plate (4). A sliding groove is opened on the outer wall of the second groove plate (3), and a rotating block (10) is slidably connected inside the sliding groove. A fixing sleeve (11) is fixed on the outer side of the rotating block (10). A connecting plate (12) is threadedly connected to the inner wall of the fixing sleeve (11), and the side of the connecting plate (12) without threads is connected to the outer wall of the first groove plate (2). A support element is provided on the left side of the second groove plate (3). The filter element includes a fixing rod (5), which is threaded to the inside of the support plate (4). A support rod (6) is fixed to the right side of the fixing rod (5). A filter element (7) is rotatably connected to the outer wall of the support rod (6). An oil filter element (8) is provided on the left side of the filter element (7). The inner side of the oil filter element (8) is rotatably connected to the support rod (6). Limiting blocks (9) are fixed to the outer walls of both the filter element (7) and the oil filter element (8). The limiting blocks (9) are inserted into the inside of the second groove plate (3).

2. A water injection device for oil and gas field development according to claim 1, characterized in that, A sealing ring is machined at the connection between the first groove plate (2) and the second groove plate (3).

3. A water injection device for oil and gas field development according to claim 1, characterized in that, A threaded hole is provided at the center of the support plate (4).

4. A water injection device for oil and gas field development according to claim 1, characterized in that, The oil filter element (8) is composed of polypropylene fibers, which can effectively adsorb and filter small oil particles in the water.

5. A water injection device for oil and gas field development according to claim 1, characterized in that, The support includes a hose (13), which is fixed to the left side of the second groove plate (3). A water injection pipe (14) is fixed to one end of the hose (13) away from the second groove plate (3). Insert rods (15) are symmetrically fixed on both sides of the outer wall of the water injection pipe (14). A sleeve (16) is sleeved on the outer wall of the insert rod (15), and the inner side of the sleeve (16) is connected to the outer wall of the second groove plate (3).

6. A water injection device for oil and gas field development according to claim 5, characterized in that, The outer wall of one side of the insertion rod (15) is threaded. After being inserted into the sleeve (16), the insertion rod (15) can be fixed by a nut.

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