Sand screen for oil and gas wells

Abstract

The utility model relates to the field of sand control screen pipe, especially oil and gas well sand control screen pipe. Including two base pipes and connecting pipe, the outer circular arc surface fixed connection of base pipe has flow guide pipe, the outer circular arc surface fixed connection of flow guide pipe has sand filter pipe, the outer circular arc surface fixed connection of sand filter pipe has protection tube, the both ends of connecting pipe are equipped with adjusting structure, the adjusting structure includes two butt -joint rings, butt -joint ring and connecting pipe fixed connection, the both ends of base pipe all fixed connection have butt -joint, the inner wall slide connection of butt -joint and butt -joint ring, the outer circular arc surface of connecting pipe and butt -joint ring has two connecting plates of clamping, the utility model provides a kind of oil and gas well sand control screen pipe, can be quickly connected and disconnect two base pipes, the clamping of clamping rod and clamping groove ensures firm connection, spring drive adjusting plate automatically locks connecting plate, improves installation efficiency and connection reliability, is applicable to the advantages of oil and gas well sand control operation.

Description

Technical Field

[0001] This utility model relates to the field of sand control screen pipes, and in particular to a sand control screen pipe for oil and gas wells. Background Technology

[0002] Sand screens are a key downhole tool in oil and gas well development, especially for loose sandstone formations. Their main function is to be run into the oil layer to form a filter barrier that allows oil and gas fluids to pass through but effectively blocks formation sand particles.

[0003] Existing technologies, such as the utility model patent with publication number CN211851791U, disclose a sand screen pipe and an oil and gas tubing string. This patent uses an outer tube body and an inner tube body; the inner tube body is coaxially arranged inside the outer tube body; a support part is provided between the outer wall of the inner tube body and the inner wall of the outer tube body, and the support part is used to support the inner wall of the outer tube body; a first sequence of through holes is formed on the tube wall of the inner tube body, and a second sequence of through holes is formed on the tube wall of the outer tube body, and the first sequence of through holes and the second sequence of through holes are interconnected.

[0004] The inventors discovered the following problems in the use of sand control screens during their daily work: In the long well sections of oil and gas wells, it is usually necessary to connect multiple sand control screens to form a complete sand control string. Currently, the connection between screens is mostly done using the traditional threaded connection method. However, this connection method has many drawbacks: threading and unthreading requires specific tools and a large operating torque. In environments with limited space downhole or on the platform, the installation efficiency is low, and it is time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of this invention is to solve the shortcomings of existing technologies, such as time-consuming, labor-intensive, and inefficient connection operations between adjacent sand-proof screens.

[0006] To solve the above-mentioned technical problems, this utility model provides a sand control screen pipe for oil and gas wells, comprising: two base pipes and a connecting pipe. A guide pipe is fixedly connected to the outer arc surface of each base pipe, a sand filter pipe is fixedly connected to the outer arc surface of the guide pipe, and a protective pipe is fixedly connected to the outer arc surface of the sand filter pipe. The connecting pipe is located at one end of the two base pipes that is close to each other. Adjustment structures are provided at both ends of the connecting pipe, each adjustment structure including two mating rings fixedly connected to the connecting pipe. A butt joint is fixedly connected to both ends of each base pipe, and the butt joint is slidably connected to the inner wall of the mating ring. Two connecting plates are engaged with the outer arc surfaces of the connecting pipe and the mating ring. Two locking rods are fixedly connected to the sides of the two connecting plates that are close to each other. Two locking grooves are opened on the surface of the connector. The inner wall of the locking groove is engaged with the locking rod. Two fixing plates are fixedly connected to the outer arc surface of the connecting tube. The two fixing plates are centrally symmetrically distributed with the connecting tube as the center. Two sliding rods are slidably connected to the inner wall of the fixing plates. An adjusting plate is fixedly connected to the end of the two sliding rods away from the fixing plates. The adjusting plate is slidably connected to the outer arc surface of the connecting tube. A spring is sleeved on the arc surface of the sliding rod. The two ends of the spring are fixedly connected to the fixing plate and the adjusting plate respectively. The end of the adjusting plate away from the sliding rod is engaged with the connecting plate.

[0007] The above components achieve the following effects: they can quickly connect and disconnect two base pipes; the locking of the clamp rod and the clamp slot ensures a firm connection; the spring-driven adjusting plate automatically locks the connecting plate, improving installation efficiency and connection reliability, and are suitable for sand control operations in oil and gas wells.

[0008] Preferably, both adjustment plates are threaded with positioning rods, and the outer arc surface of the connecting pipe is provided with a plurality of positioning holes, the inner wall of the positioning holes being engaged with the positioning rods.

[0009] The effects achieved by the above components are: the cooperation between the positioning rod and the positioning hole allows the adjustment plate to be temporarily fixed, making it easy for the adjustment plate to maintain its position after being moved, facilitating single-person operation, and improving the convenience of installation and disassembly.

[0010] Preferably, both ends of the connecting pipe are fixedly connected with sealing rings, specifically fluororubber rings.

[0011] The effects achieved by the above components are as follows: the sealing ring can effectively ensure the sealing between the connecting pipe and the joint, preventing fluid leakage in the oil and gas well; the fluororubber ring has high temperature resistance and corrosion resistance, and is suitable for harsh downhole environments.

[0012] Preferably, the end of the lever away from the connecting plate is arc-shaped.

[0013] The effect achieved by the above components is that the arc-shaped design at the end of the lever makes it easier for the lever to slide smoothly into the slot, reducing jamming and wear, and making the connection process smoother.

[0014] Preferably, a bellows is fitted onto the arc surface of the slide rod at the position corresponding to the spring, and the two ends of the bellows are fixedly connected to the fixed plate and the adjusting plate, respectively.

[0015] The effects achieved by the above components are: the bellows can protect the spring from contamination by mud and debris in the well, extend the service life of the spring, and improve the durability of the structure.

[0016] Preferably, the surface of the adjusting plate is provided with a reserved groove, which is an arc-shaped groove.

[0017] The effect achieved by the above components is that the reserved slot provides a point of leverage for manually operating the adjustment plate, making it easier for users to apply force to move the adjustment plate and improving the ease of operation.

[0018] Compared with related technologies, the sand control screen pipe for oil and gas wells provided by this utility model has the following beneficial effects:

[0019] This utility model provides a sand control screen pipe for oil and gas wells. Through an adjustable structure, two base pipes and a connecting pipe can be quickly connected and locked. This structure automatically drives the adjusting plate to reset and lock the connecting plate using spring force, ensuring the locking rod is securely engaged in the slot of the connector, guaranteeing high efficiency and reliability of the connection. The entire connection process requires no complex tools or complicated operations, significantly improving the installation and maintenance efficiency of downhole screen pipes. It is especially suitable for single-person operation in space-constrained environments. This design not only ensures the structural strength of the connection and effectively transmits the tubing load, but its built-in sealing ring further enhances the sealing performance of the connection, preventing formation sand intrusion and thus ensuring the long-term stable operation of the sand control screen pipe under complex oil and gas well conditions. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a sand control screen pipe for oil and gas wells provided by this utility model;

[0021] Figure 2 for Figure 1 A partial structural schematic diagram of the adjustment structure shown;

[0022] Figure 3 for Figure 1 The diagram shows the disassembled structure of the adjustment mechanism.

[0023] Figure 4 for Figure 1 The diagram shows the disassembled structure of the connecting pipe.

[0024] Figure 5 for Figure 4 The diagram shows the disassembly structure of the adjustment plate.

[0025] The following are the labels in the diagram: 1. Base pipe; 2. Guide pipe; 3. Sand filter pipe; 4. Protective pipe; 5. Connecting pipe; 6. Adjusting structure; 601. Butt ring; 602. Joint; 603. Sealing ring; 604. Connecting plate; 605. Locking rod; 606. Locking groove; 607. Fixing plate; 608. Slide rod; 609. Adjusting plate; 610. Spring; 611. Bellows; 612. Positioning rod; 613. Positioning hole; 614. Reserved groove. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0028] Please see Figures 1 to 4 The present invention provides a sand screen pipe for oil and gas wells, comprising: two base pipes 1 and a connecting pipe 5. A guide pipe 2 is fixedly connected to the outer arc surface of the base pipe 1, a sand filter pipe 3 is fixedly connected to the outer arc surface of the guide pipe 2, a protective pipe 4 is fixedly connected to the outer arc surface of the sand filter pipe 3, and the connecting pipe 5 is located at one end of the two base pipes that are close to each other. Adjustment structures 6 are provided at both ends of the connecting pipe 5.

[0029] In the embodiments of this utility model, please refer to Figures 1 to 5The adjusting structure 6 includes two docking rings 601, which are fixedly connected to the connecting pipe 5. Both ends of the base pipe 1 are fixedly connected to connectors 602, which are slidably connected to the inner walls of the docking rings 601. Two connecting plates 604 are engaged with the outer arc surfaces of the connecting pipe 5 and the docking rings 601. Two locking rods 605 are fixedly connected to the sides of the two connecting plates 604 that are close to each other. Two slots 606 are formed on the surface of the connectors 602, and the inner walls of the slots 606 engage with the locking rods 605. Two fixing plates 607 are fixedly connected to the outer arc surface of the connecting pipe 5, and the two fixing plates 607 are centrally symmetrically distributed around the connecting pipe 5. Two sliding rods are slidably connected to the inner walls of the fixing plates 607. 608. An adjusting plate 609 is fixedly connected to the end of each sliding rod 608 away from the fixed plate 607. The adjusting plate 609 is slidably connected to the outer arc surface of the connecting pipe 5. A spring 610 is fitted onto the arc surface of the sliding rod 608. Both ends of the spring 610 are fixedly connected to the fixed plate 607 and the adjusting plate 609 respectively. The end of the adjusting plate 609 away from the sliding rod 608 is engaged with the connecting plate 604, allowing for quick connection and disconnection of the two base pipes 1. The engagement of the locking rod 605 and the locking groove 606 ensures a secure connection. The adjusting plate 609, driven by the spring 610, automatically locks the connecting plate 604, improving installation efficiency and connection reliability. This is suitable for sand control operations in oil and gas wells. Positioning rods 6 are threaded into the surfaces of both adjusting plates 609. 12. Several positioning holes 613 are provided on the outer arc surface of the connecting pipe 5. The inner wall of the positioning hole 613 is engaged with the positioning rod 612. The cooperation between the positioning rod 612 and the positioning hole 613 allows the adjusting plate 609 to be temporarily fixed, which facilitates the adjustment plate 609 to maintain its position after movement, making it easy for a single person to operate and improving the convenience of installation and disassembly. Both ends of the connecting pipe 5 are fixedly connected with sealing rings 603. The sealing rings 603 are specifically fluororubber rings. The sealing rings 603 can effectively ensure the sealing between the connecting pipe 5 and the butt joint 602 to prevent fluid leakage in the oil and gas well. The fluororubber rings have high temperature resistance and corrosion resistance, and are suitable for harsh downhole environments. The end of the clamping rod 605 away from the connecting plate 604 is arc-shaped. The arc-shaped design at the end of the lever 605 facilitates its smooth sliding into the slot 606, reducing jamming and wear, and making the connection process smoother. The arc surface of the slide rod 608 is fitted with a bellows 611 corresponding to the position of the spring 610. The two ends of the bellows 611 are fixedly connected to the fixed plate 607 and the adjusting plate 609, respectively. The bellows 611 can protect the spring 610 from the contamination of mud and debris in the well, extend the service life of the spring 610, and improve the durability of the structure. The surface of the adjusting plate 609 is provided with a reserved groove 614. The reserved groove 614 is an arc-shaped groove. The reserved groove 614 provides a force point for manually operating the adjusting plate 609, making it easy for the user to apply force to move the adjusting plate 609 and improving the ease of operation.

[0030] The working principle of the sand control screen pipe for oil and gas wells provided by this utility model is as follows: By setting the adjustment structure 6, first rotate the positioning rod 612. The positioning rod 612 moves away from the connecting pipe 5 along the adjustment plate 609 by means of the thread. The positioning rod 612 disengages from the corresponding positioning hole 613, releasing the limitation on the adjustment plate 609. Then, the adjustment plate 609 moves towards the fixed plate 607. The adjustment plate 609 moves along the arc surface of the connecting pipe 5 in cooperation with the sliding rod 608. During this process, the sliding rod 608 always moves along the fixed plate 607, and the spring 610 is in a compressed state. When the adjustment plate 609 disengages from the connecting plate 607... 04. Release the limiting position on the connecting plate 604. At this time, the user can rotate the positioning rod 612 in the opposite direction to move the positioning rod 612 into the corresponding positioning hole 613, temporarily limiting the adjusting plate 609 for easy single-person operation. Similarly, operate the other adjusting plate 609 on the connecting pipe 5, and then move the two connecting plates 604 away from the connecting pipe 5. Next, operate the two base pipe 1 connectors 602 to move into the connecting rings at both ends of the connecting pipe 5, and keep the slots 606 on the connectors 602 in position. Then, operate the two connecting plates 604 to engage with the connecting pipe 5. The connecting plates 604 drive the locking rods 605 at both ends. The two connectors 602 are respectively moved into the slots 606 on the two mating joints 602. Then, the adjusting plate 609 is released. Under the action of the spring force of the spring 610, the adjusting plate 609 moves away from the fixed plate 607. The moving adjusting plate 609 blocks the connecting plate 604, fixing the position of the connecting plate 604. This fixes the two mating joints 602 at both ends of the connecting pipe 5, and the two base pipes 1 are connected. The cooperation between the positioning rod 612 and the positioning hole 613 allows the adjusting plate 609 to be temporarily fixed, making it easy for the adjusting plate 609 to maintain its position after movement. This facilitates single-person operation and improves the convenience of installation and disassembly. The sealing ring 603 can... The system effectively ensures the sealing between the connecting pipe 5 and the butt joint 602, preventing fluid leakage in the oil and gas well. The fluororubber ring has high temperature and corrosion resistance, making it suitable for harsh downhole environments. The arc-shaped design at the end of the clamping rod 605 facilitates its smooth sliding into the clamping groove 606, reducing jamming and wear, and making the connection process smoother. The corrugated pipe 611 protects the spring 610 from contamination by downhole mud and debris, extending the service life of the spring 610 and improving the durability of the structure. The reserved groove 614 provides a point of leverage for manually operating the adjustment plate 609, making it easy for users to apply force to move the adjustment plate 609 and improving operational convenience.

[0031] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A sand-control screen pipe for oil and gas wells, characterized in that, include: Two base pipes (1) and a connecting pipe (5). A guide pipe (2) is fixedly connected to the outer arc surface of the base pipe (1). A filter pipe (3) is fixedly connected to the outer arc surface of the guide pipe (2). A protective pipe (4) is fixedly connected to the outer arc surface of the filter pipe (3). The connecting pipe (5) is located at one end of the two base pipes (1) that is close to each other. An adjustment structure (6) is provided at both ends of the connecting pipe (5). The adjustment structure (6) includes two docking rings (601). The docking rings (601) are fixedly connected to the connecting pipe (5). A butt joint (602) is fixedly connected to both ends of the base pipe (1). The butt joint (602) is slidably connected to the inner wall of the docking ring (601). Two connecting plates (604) are snapped onto the outer arc surface of the connecting pipe (5) and the docking ring (601). Two clamping rods (604) are fixedly connected to the side of the two connecting plates (604) that are close to each other. 5) The surface of the connector (602) has two slots (606). The inner wall of the slot (606) is engaged with the locking rod (605). The outer arc surface of the connecting pipe (5) is fixedly connected to two fixing plates (607). The two fixing plates (607) are centrally symmetrically distributed with the connecting pipe (5) as the center. The inner wall of the fixing plate (607) is slidably connected to two sliding rods (608). The end of the two sliding rods (608) away from the fixing plate (607) is fixedly connected to an adjusting plate (609). The adjusting plate (609) is slidably connected to the outer arc surface of the connecting pipe (5). The arc surface of the sliding rod (608) is fitted with a spring (610). The two ends of the spring (610) are fixedly connected to the fixing plate (607) and the adjusting plate (609) respectively. The end of the adjusting plate (609) away from the sliding rod (608) is engaged with the connecting plate (604).

2. The sand control screen pipe for oil and gas wells according to claim 1, characterized in that, Both adjustment plates (609) are threaded with positioning rods (612), and the outer arc surface of the connecting pipe (5) is provided with several positioning holes (613), the inner wall of the positioning holes (613) is engaged with the positioning rods (612).

3. The sand control screen pipe for oil and gas wells according to claim 1, characterized in that, Both ends of the connecting pipe (5) are fixedly connected with sealing rings (603), and the sealing rings (603) are specifically fluororubber rings.

4. A sand control screen for oil and gas wells according to claim 1, characterized in that, The end of the lever (605) away from the connecting plate (604) is arc-shaped.

5. A sand control screen for oil and gas wells according to claim 1, characterized in that, A bellows tube (611) is fitted on the arc surface of the slide rod (608) corresponding to the position of the spring (610). The two ends of the bellows tube (611) are fixedly connected to the fixing plate (607) and the adjusting plate (609) respectively.

6. A sand control screen for oil and gas wells according to claim 1, characterized in that, The surface of the adjustment plate (609) is provided with a reserved groove (614), which is an arc-shaped groove.

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