A self-supporting sand control screen
By designing a self-supporting sand-proof screen pipe with equal diameter outer wall and a self-supporting sand-proof screen pipe that uses oil pipes to press and soluble stabilization nails, the problem of sand-proof screen pipes being easily damaged and difficult to pull out during the well and production process is solved, achieving more efficient sand-proofing effects and lower maintenance costs.
Patent Information
- Application Number
- CN202520385295.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2035-03-06
AI Technical Summary
The existing sandproof screen pipes are prone to collision and damage during the process of going down the well, and during the production process, the screen pipes are difficult to pull out due to sand burial, which increases maintenance costs and may lead to oil and gas well pollution.
A self-help formal sandproof screen pipe is designed, with its outer wall equal to the main part of the lower central pipe, forming an outer wall of equal diameter to avoid collision and damage. Through the oil pipe pressing and the use of soluble stabilization nails, the screen pipe is straightened and the opening of the channel is simplified.
It effectively avoids damage to the sand barrier during the well down process, simplifies the process of straightening and pulling out the screen pipe, reduces maintenance costs, and avoids pollution in oil and gas wells.
Smart Images
Figure CN222731531U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand prevention and well completion in petroleum exploitation, in particular to a self-supporting sand prevention screen pipe. Background Art
[0002] At present, many oil and gas wells need sand control due to loose reservoirs and sand production. Due to its long-term production, mechanical sand control accounts for more than 90%, and sand control screens are the core tools in mechanical sand control. At present, conventional sand control screens are mainly composed of couplings, perforated base pipes, sand retaining layers (such as precision mesh, wire-wound seams, and sintered solidified proppants), and other components. The sand retaining layer is placed on the outside of the base pipe. In actual production, the main problems faced are as follows:
[0003] The sand retaining layer is placed outside the base pipe. Since the sand retaining layer is higher and more fragile outside the base pipe, it is easy to damage the sand retaining layer during the process of the screen pipe going down the well, resulting in the failure of the sand retaining layer to prevent sand. Some screen pipes use a side flow protection cover outside the sand retaining layer, which is beneficial to the anti-collision protection of the screen pipe sand retaining layer when going down the well, and can also prevent the production fluid from directly eroding the sand retaining layer, but the sand retaining layer + protective layer has a larger outer diameter and protrusion.
[0004] When the screen is lowered into the oil and gas well, during filling and sand prevention or production, the filled proppant or formation sand will gradually bury the screen. As production progresses, when the oil and gas well screen is pierced by liquid flow and sand blocks the wellbore, or the migration of particles causes the seepage channel to be blocked, resulting in a sharp drop in production, the screen needs to be pulled out and sand prevention construction is carried out again to restore the production capacity of the oil and gas well. However, due to the different outer diameters of the coupling, base pipe and sand retaining layer, the outside of the screen is uneven, and the outside of the screen is buried by proppant or formation sand. When repairing such sand prevention wells, it is very difficult to pull out the screen, especially for the long well section screen in the horizontal well. Even if corresponding measures such as force-enhanced salvage or inverted installation are adopted, it is either impossible to pull it out or it is time-consuming and labor-intensive. The cost of the repair operation is extremely high. Due to the long time of well pressure repair operation, the oil and gas wells are seriously polluted and the production capacity is affected. Utility Model Content
[0005] The purpose of the utility model is to provide a self-supporting sand control screen pipe in view of the above-mentioned defects in the prior art. The wall thickness formed by the utility model is equal to the main part of the lower center pipe, forming an outer wall of equal diameter, which will not bump against the wire when going down the well; in addition, by pressurizing the oil pipe, the shear nails are disconnected, and the lower part of the straightening sleeve and the locking ring are pushed upward, squeezing the straightening leaf spring to arch up, so that the screen pipe body is centered in the wellbore of the oil and gas well, realizing the straightening function; and the straightening leaf spring has limited strength and small resistance, so that the screen pipe is easy to pull out.
[0006] The utility model discloses a self-supporting sand control screen tube, and its technical scheme is: including an upper joint, an outer tube, soluble stabilizing nails, soluble rubber, wire wrapping, supporting ribs, a lower center tube, a straightening sleeve, a straightening leaf spring, a locking ring, a movable sleeve, a shear nail, and a lower joint. The upper end of the lower center tube is provided with an upper joint, the lower end of the lower center tube is provided with a lower joint, an inner wire wrapping screen cylinder composed of supporting ribs and wire wrapping is provided in the middle and upper part of the lower center tube, and an outer tube is arranged outside the inner wire wrapping screen cylinder to form a connection with the lower center tube. The main body of the core tube has an equal outer diameter, and a plurality of mounting holes are distributed on the outer tube, and soluble stabilizing nails with soluble rubber are installed in the mounting holes; a centralizer composed of a centralizing sleeve, a centralizing leaf spring, a locking ring, a movable sleeve, and a shearing nail is provided at the middle and lower part of the lower central tube, and a plurality of centralizing leaf springs are provided on the centralizing sleeve, and the lower end of the centralizing sleeve is in contact with the locking ring and the movable sleeve, and the lower part of the movable sleeve is provided with a shearing nail, and a pressure transmission hole is provided at the lower part of the lower central tube, and a movable sleeve is installed outside the pressure transmission hole;
[0007] The inner wall of the lock ring is provided with one or more one-way teeth, and the outer wall of the lower center tube is provided with fixed teeth matching with the one-way teeth.
[0008] Preferably, the above-mentioned wire winding is wound around the outside of the supporting ribs and fixed by welding to form an inner wire winding screen cylinder; it is connected to the lower center tube through an upper joint, the inner wire winding screen cylinder is placed inside the outer tube, mounting holes are evenly distributed on the outer tube in an staggered manner, soluble rubber is pressed into the mounting holes, and it is fixed by soluble stabilizing nails.
[0009] The above-mentioned gap of the winding wire has a structure of being narrow outside and wide inside.
[0010] Preferably, the above-mentioned movable sleeve comprises a movable sleeve main body, an internal thread, an upper positioning platform, an upper sealing ring groove, a lower sealing ring groove, and a shear nail hole. The upper end of the movable sleeve main body is provided with an internal thread, and the lower side of the internal thread is provided with an upper positioning platform. An upper sealing ring groove is provided in the middle part of the inner wall of the upper positioning platform for cooperating with the first O-ring, and a lower sealing ring groove is provided on the inner wall of the movable sleeve main body below the upper positioning platform for cooperating with the second O-ring, and a shear nail hole is provided in the lower part of the inner wall of the movable sleeve main body.
[0011] Preferably, the shear pins mentioned above pass through the shear pin holes at the lower part of the movable sleeve and are movably connected to the outer wall of the lower joint.
[0012] The beneficial effects of the utility model are as follows: the wall thickness formed by the utility model is equal to the main part of the lower center pipe, forming an outer wall of equal diameter, which will not bump against the wire when going down the well; in addition, by pressurizing the oil pipe, the shear nails are disconnected, pushing the lower part of the straightening sleeve and the lock ring upward, squeezing the straightening leaf spring to arch up, so that the screen body is centered in the wellbore of the oil and gas well, and the straightening function is realized; in addition, when the screen is buried in sand, due to the limited strength and small resistance of the only raised straightening leaf spring, the overall contact area of the sand-buried screen outside is smaller, the resistance to pulling out the screen will be smaller, and the screen is easy to pull out; in addition, the soluble stabilizing nails and the soluble rubber are dissolved under the action of well fluid and well temperature, or a solvent is added to help them dissolve, so as to open the internal and external channels of the screen; the maintenance operation cost is reduced, and the problem of oil and gas well pollution affecting production capacity is avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the structure of the utility model when righting;
[0015] Figure 3 It is a schematic diagram of the structure of the mobile set;
[0016] Figure 4 It is an enlarged schematic diagram of the lock ring when it moves;
[0017] Figure 5 It is an enlarged schematic diagram of the connection between the inner wire-wound screen cylinder and the outer tube;
[0018] In the above figure: upper joint 1, outer tube 2, soluble stabilizing nail 3, soluble rubber 4, wire winding 5, supporting rib 6, lower center tube 7, straightening sleeve 8, straightening leaf spring 9, locking ring 10, first O-ring 11, movable sleeve 12, second O-ring 13, shear nail 14, lower joint 15, pressure transmission hole 16, one-way tooth 10.1, fixed tooth 10.2, movable sleeve body 12.1, internal thread 12.2, upper limit platform 12.3, upper sealing ring groove 12.4, lower sealing ring groove 12.5, shear nail hole 12.6. DETAILED DESCRIPTION
[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0020] Example 1, reference Figure 1 and Figure 2The utility model mentions a self-supporting sand control screen pipe, comprising an upper joint 1, an outer pipe 2, a soluble stabilizing nail 3, a soluble rubber 4, a wire wrap 5, a support rib 6, a lower center pipe 7, a straightening sleeve 8, a straightening leaf spring 9, a locking ring 10, a first O-ring 11, a movable sleeve 12, a second O-ring 13, a shear nail 14, and a lower joint 15. The upper end of the lower center pipe 7 is provided with an upper joint 1, and the lower end of the lower center pipe 7 is provided with a lower joint 15. An inner wire wrap screen cylinder composed of support ribs 6 and wire wrap 5 is provided in the middle and upper part of the lower center pipe 7. An outer pipe 2 is arranged outside the inner wire wrap screen cylinder to form an outer diameter equal to that of the main part of the lower center pipe 7. A plurality of mounting holes are distributed on the outer pipe 2. A soluble stabilizing nail 3 with soluble rubber 4 is installed in the mounting hole; a centralizer consisting of a centralizing sleeve 8, a centralizing leaf spring 9, a locking ring 10, a first O-ring 11, a movable sleeve 12, a second O-ring 13, and a shear nail 14 is provided at the middle and lower part of the lower center tube 7, the centralizing sleeve 8 is provided with multiple groups of centralizing leaf springs 9, the lower end of the centralizing sleeve 8 is in contact with the locking ring 10 and the movable sleeve 12, the lower part of the movable sleeve 12 is provided with a shear nail 14, a pressure transmission hole 16 is provided at the lower part of the lower center tube 7, and the movable sleeve 12 is installed outside the pressure transmission hole 16, a first O-ring 11 is provided between the movable sleeve 12 and the lower center tube 7, and a second O-ring 13 is provided between the movable sleeve 12 and the lower joint 15.
[0021] Among them, the above-mentioned wire wrapping 5 is wound around the outside of the supporting rib 6 and is welded and fixed to form an inner wire wrapping screen cylinder; it is connected to the lower center tube 7 through the upper joint 1, and the inner wire wrapping screen cylinder is placed inside the outer tube 2. The mounting holes are staggered and evenly distributed on the outer tube 2, and the soluble rubber 4 is pressed into the mounting holes, and is connected and fixed by the soluble stabilizing nails 3.
[0022] Reference Figure 3 The movable sleeve 12 mentioned in the utility model includes a movable sleeve body 12.1, an internal thread 12.2, an upper limit positioning platform 12.3, an upper sealing ring groove 12.4, a lower sealing ring groove 12.5, and a shear nail hole 12.6. The upper end of the movable sleeve body 12.1 is provided with an internal thread 12.2, and the lower side of the internal thread 12.2 is provided with an upper limit positioning platform 12.3. An upper sealing ring groove 12.4 is provided in the middle of the inner wall of the upper limit positioning platform 12.3 for cooperating with the first O-ring 11, and a lower sealing ring groove 12.5 is provided on the inner wall of the movable sleeve body 12.1 below the upper limit positioning platform 12.3 for cooperating with the second O-ring 13, and a shear nail hole 12.6 is provided in the lower part of the inner wall of the movable sleeve body 12.1.
[0023] Reference Figure 4 The inner wall of the lock ring 10 mentioned in the utility model is provided with more than one set of one-way teeth 10.1, and the outer wall of the lower center tube 7 is provided with fixed teeth 10.2 matched with the one-way teeth 10.1.
[0024] The shear pins 14 pass through the shear pin holes 12 . 6 at the lower part of the movable sleeve 12 and are movably connected to the outer wall of the lower joint 15 .
[0025] The working principle of the utility model is:
[0026] (1) Safe running: After the inner wire screen drum and the outer pipe 2 are matched, the wall thickness formed is equal to the main part of the lower center pipe 7, and forms an outer wall with the same diameter as the outer walls of the upper joint 1 and the lower joint 15. Therefore, when running into the well, the wire 5 will not be hit, causing damage to the sand retaining layer and premature failure;
[0027] (2) Pressurized straightening: By pressurizing the oil pipe connected from the upper part, when the pressure reaches the designed value, the movable sleeve 12 cuts off the shear pins 14 and moves upward, pushing the lower part of the straightening sleeve 8 and the locking ring 10 upward, and the locking ring 10 can only be locked upward, thereby squeezing the straightening leaf spring 9 to arch up, so that the screen body can be centered in the wellbore of the oil and gas well, realizing the straightening function;
[0028] (3) Opening of production channel: the soluble stabilizer nail 3 and the soluble rubber 4 are dissolved or a solvent is added to assist their dissolution under the action of well fluid and well temperature, thereby opening the channels inside and outside the screen tube;
[0029] (4) Easy to pull out the screen: When the screen is buried in sand, the strength of the only protruding straightening leaf spring 9 is limited and the resistance is small, resulting in a smaller overall contact area on the outside of the sand-buried screen. The resistance to pulling out the screen will be smaller, making it easier to pull out the screen.
[0030] Embodiment 2, a self-supporting sand control screen mentioned in the utility model, comprises an upper joint 1, an outer tube 2, a soluble stabilizing nail 3, a soluble rubber 4, a wire wrap 5, a support rib 6, a lower center tube 7, a straightening sleeve 8, a straightening leaf spring 9, a locking ring 10, a first O-ring 11, a movable sleeve 12, a second O-ring 13, a shear nail 14, and a lower joint 15, wherein the upper end of the lower center tube 7 is provided with an upper joint 1, the lower end of the lower center tube 7 is provided with a lower joint 15, an inner wire wrap screen cylinder composed of a support rib 6 and a wire wrap 5 is provided in the middle and upper part of the lower center tube 7, and an outer tube 2 is arranged outside the inner wire wrap screen cylinder to form a connection with the lower center tube 7 The main body part has an outer diameter equal to that of the main body part, and a plurality of mounting holes are distributed on the outer tube 2, and a soluble stabilizing nail 3 with a soluble rubber 4 is installed in the mounting hole; a centralizer consisting of a centralizing sleeve 8, a centralizing leaf spring 9, a locking ring 10, a first O-ring 11, a movable sleeve 12, a second O-ring 13, and a shear nail 14 is provided at the middle and lower part of the lower center tube 7, and the centralizing sleeve 8 is provided with a plurality of centralizing leaf springs 9, and the lower end of the centralizing sleeve 8 is in contact with the locking ring 10 and the movable sleeve 12, and the lower part of the movable sleeve 12 is provided with a shear nail 14, and a pressure transmission hole 16 is provided at the lower part of the lower center tube 7, and the movable sleeve 12 is installed outside the pressure transmission hole 16.
[0031] The difference from Example 1 is:
[0032] Reference Figure 5 The gap of the wire wrap 5 mentioned in the utility model is a narrow outer and wide inner structure, which has a self-cleaning function and can effectively prevent the flow of particles from migrating and clogging the screen pipe, thus having a long-term sand control production function.
[0033] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.
Claims
1. A self-supporting sand control screen, characterized by: The invention comprises an upper joint (1), an outer tube (2), a soluble stabilizing nail (3), a soluble rubber (4), a wire wrap (5), a supporting rib (6), a lower center tube (7), a straightening sleeve (8), a straightening leaf spring (9), a locking ring (10), a movable sleeve (12), a shear nail (14), and a lower joint (15). The upper end of the lower center tube (7) is provided with an upper joint (1), the lower end of the lower center tube (7) is provided with a lower joint (15), an inner wire wrap screen cylinder composed of supporting ribs (6) and a wire wrap (5) is provided at the middle and upper part of the lower center tube (7), and an outer tube (2) is arranged outside the inner wire wrap screen cylinder to form an outer diameter equal to that of the main part of the lower center tube (7). , a plurality of mounting holes are distributed on the outer tube (2), and soluble stabilizing nails (3) with soluble rubber (4) are installed in the mounting holes; a centralizer consisting of a centralizing sleeve (8), a centralizing leaf spring (9), a locking ring (10), a movable sleeve (12), and a shear nail (14) is provided at the middle and lower part of the lower center tube (7); the centralizing sleeve (8) is provided with a plurality of groups of centralizing leaf springs (9); the lower end of the centralizing sleeve (8) is in contact with the locking ring (10) and the movable sleeve (12); the lower part of the movable sleeve (12) is provided with a shear nail (14); a pressure transmission hole (16) is provided at the lower part of the lower center tube (7), and the movable sleeve (12) is installed outside the pressure transmission hole (16); The inner wall of the lock ring (10) is provided with one or more one-way teeth (10.1), and the outer wall of the lower center tube (7) is provided with fixed teeth (10.2) that cooperate with the one-way teeth (10.1).
2. The self-supporting sand control screen according to claim 1 is characterized by: The wire wrap (5) is wound around the outside of the support rib (6) and fixed by welding to form an inner wire wrap screen cylinder; the inner wire wrap screen cylinder is connected to the lower center tube (7) via an upper joint (1), the inner wire wrap screen cylinder is placed inside the outer tube (2), mounting holes are evenly distributed on the outer tube (2), soluble rubber (4) is pressed into the mounting holes, and connected and fixed via soluble stabilizing nails (3).
3. The self-supporting sand control screen according to claim 2 is characterized by: The gap of the winding wire (5) is a structure that is narrow outside and wide inside.
4. The self-supporting sand control screen according to claim 3 is characterized by: The movable sleeve (12) comprises a movable sleeve body (12.1), an internal thread (12.2), an upper limit positioning platform (12.3), an upper sealing ring groove (12.4), a lower sealing ring groove (12.5), and a shear nail hole (12.6). The upper end of the movable sleeve body (12.1) is provided with an internal thread (12.2), the lower side of the internal thread (12.2) is provided with an upper limit positioning platform (12.3), an upper sealing ring groove (12.4) is provided in the middle of the inner wall of the upper limit positioning platform (12.3) for matching with the first O-ring (11), a lower sealing ring groove (12.5) is provided on the inner wall of the movable sleeve body (12.1) below the upper limit positioning platform (12.3) for matching with the second O-ring (13), and a shear nail hole (12.6) is provided in the lower part of the inner wall of the movable sleeve body (12.1).
5. The self-supporting sand control screen according to claim 4 is characterized by: The shear pin (14) passes through the shear pin hole (12.6) at the bottom of the movable sleeve (12) and is movably connected to the outer wall of the lower joint (15).