High-strength sealing anti-falling centralizing thermal recovery packer
By using a seat sealing mechanism of U-shaped sealing ring and thermal expansion liquid in the steam injection sealer, combined with the design of the straightening slider spring and joint bearing, the problems of insufficient sealing and prone to fracture in the prior art are solved, and the tail tube is easily broken, so as to achieve Highly efficient sealing and long-life thermal packer.
Patent Information
- Application Number
- CN202421107159.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing steam injection sealer is insufficiently sealed under high temperature and high pressure conditions, resulting in heat loss and easy breakage of the tail pipe, affecting the efficiency and cost of heavy oil mining.
A high-strength seal anti-release and positive thermal extraction packer is designed, using a U-shaped seal ring and thermal expansion liquid to push the cone into the sealing sleeve at high temperature to realize seat sealing, automatic unsealing at low temperatures, and through the straightening slider spring and The joint bearing absorbs vibration stress to prevent fatigue and fracture of the lower joint.
Effectively reduce heat loss, improve the performance and service life of the packer, and ensure steam injection quality and working efficiency.
Smart Images
Figure CN222276634U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit board production and processing, in particular to a high-strength sealing anti-detachment and righting thermal recovery packer. Background Art
[0002] At present, in the production of heavy oil and extra-heavy oil in my country, wells are usually insulated by steam injection packers. Because the steam injection quality of traditional packers is poor, in order to improve the steam injection quality and protect the oil well casing, users must let the packers avoid the casing change section and install the packers above the oil layer perforation section and the casing change section.
[0003] Existing steam injection packers usually include upper joints, sealing rings, transition joints, sealing sleeves, center pipes, cones, cylinder liners, thermal expansion springs, U-shaped sealing rings, righting sliders, righting slider springs, self-aligning sleeves and self-aligning lower joints and other components. These components work together to handle high-temperature and high-pressure steam during the steam injection production process to ensure sealing. When the steam temperature exceeds 200°C, the seal will start and seal quickly, the spherical bearing will dissipate the vibration and rotation force generated when the steam is ejected from the tail pipe, the righting slider and its spring will absorb the vibration from the tail pipe, keep the packer stable, and ensure that the sealing sleeve is in the best sealing state to improve production efficiency and extend the service life of the equipment.
[0004] A tail pipe is connected to the lower end of the packer to allow the injected steam to reach the middle of the oil layer directly to reduce heat loss. This method is effective, but some tail pipe accidents often occur, and the lower joint of the packer will be broken or disengaged. All tail pipes can be salvaged in one salvage, but in some heavy oil wells with serious sand production, the sand will bury the tail pipe completely, making the salvage work difficult and even requiring overhaul operations, resulting in increased heavy oil production costs. Therefore, a high-strength sealing, anti-detachment and righting thermal recovery packer is proposed. Utility Model Content
[0005] In order to make up for the above shortcomings, the utility model provides a high-strength sealing anti-detachment and righting thermal recovery packer, which aims to improve the problem of poor steam injection quality in the prior art, easy heat loss and low working efficiency.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-strength sealing anti-detachment and righting thermal recovery packer, comprising an upper joint, an upper joint sealing ring is arranged inside the upper joint, a transition joint is fixedly connected inside the upper joint, a sealing sleeve is arranged inside the transition joint, a center pipe is threadedly connected to the inner wall of the transition joint, an aligning sleeve is threadedly connected to the inner wall of the center pipe, a cone is arranged on the outer wall of the center pipe, a cylinder sleeve is arranged on the outer wall of the cone, and a righting slider is arranged inside the center pipe.
[0007] Furthermore, the straightening slider is provided with a plurality of straightening slider springs.
[0008] Furthermore, a plurality of the righting slider springs are linearly distributed inside the righting slider.
[0009] Furthermore, a self-aligning sleeve is threadedly connected to the outer wall of the central tube, and the inner wall of the self-aligning sleeve is rotatably connected to the outer wall of the straightening slider.
[0010] Furthermore, one side of the outer wall of the straightening slider abuts against the inner wall of the cylinder sleeve.
[0011] Furthermore, a self-aligning lower joint is rotatably connected inside the self-aligning sleeve.
[0012] Furthermore, the upper surface of the transition joint abuts against the outer wall of the upper joint sealing ring.
[0013] Furthermore, a U-shaped sealing ring is arranged inside the cone, and a thermal expansion liquid is arranged inside the U-shaped sealing ring.
[0014] The utility model has the following beneficial effects:
[0015] 1. In the utility model, steam is injected to make the U-shaped sealing ring push the cone to move, and then the cone is inserted into the sealing sleeve, so that the sealing sleeve opens outward and fits the well wall for sealing, thereby achieving the effect of seat sealing, reducing heat loss, and improving the performance of the packer. When the temperature drops, the cone will retract into the cylinder sleeve under gravity and negative pressure to achieve the effect of automatic unsealing, thereby improving the practicability of the packer and meeting the needs of thermal recovery.
[0016] 2. In the utility model, the pre-tightening force of the righting slider spring is applied to the righting slider, so that the packer is always located in the center of the wellbore, which can absorb the influence of the tail vibration on the sealing sleeve. The joint bearing formed between the self-aligning lower joint and the self-aligning sleeve can effectively avoid fatigue fracture of the lower joint, thereby achieving the effect of extending the service life of the packer. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic cross-sectional structure diagram of a high-strength sealing anti-detachment and righting thermal recovery packer proposed by the utility model;
[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0019] Figure 3 for Figure 1 Enlarged view of point B in the middle.
[0020] Legend:
[0021] 1. Upper joint; 2. Upper joint sealing ring; 3. Transition joint; 4. Sealing sleeve; 5. Center tube; 6. Cone; 7. Cylinder liner; 8. Thermal expansion fluid; 9. U-shaped sealing ring; 10. Centering slider; 11. Centering slider spring; 12. Aligning sleeve; 13. Aligning lower joint. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] Reference Figure 1 and Figure 2 The utility model provides an embodiment: a high-strength sealing anti-detachment and righting thermal recovery packer, comprising an upper joint 1, an upper joint sealing ring 2 is arranged inside the upper joint 1, a transition joint 3 is fixedly connected inside the upper joint 1, a sealing sleeve 4 is arranged inside the transition joint 3, a center pipe 5 is threadedly connected to the inner wall of the transition joint 3, a centering sleeve 12 is threadedly connected to the inner wall of the center pipe 5, a cone 6 is arranged on the outer wall of the center pipe 5, a cylinder sleeve 7 is arranged on the outer wall of the cone 6, and a righting slider 10 is arranged inside the center pipe 5.
[0024] Specifically, after normal steam injection begins, high-temperature and high-pressure steam enters the oil layer. When the steam temperature exceeds 200°C, the hot expansion liquid 8 vaporizes to generate thrust, the lower sealing ring prevents pressure loss, the upper sealing ring pushes the cone 6 to move, the cone 6 is inserted into the sealing sleeve 4, the sealing sleeve 4 is sealed against the well wall, and the sealing is achieved to reduce heat loss. During the steam injection process, the sealing sleeve 4 maintains the sealing state. When the steam injection is completed and the temperature is lower than 200°C, the expansion liquid liquefies and the volume is reduced, the cone 6 retracts, the sealing sleeve 4 cools and retracts to the initial position, and the packer is automatically unsealed, which improves the working efficiency of the packer.
[0025] Reference Figure 1 , Figure 2 and Figure 3 The righting slider 10 is provided with a plurality of righting slider springs 11, and the plurality of righting slider springs 11 are linearly distributed inside the righting slider 10. A self-aligning sleeve 12 is threadedly connected to the outer wall of the center tube 5, and the inner wall of the self-aligning sleeve 12 is rotatably connected to the outer wall of the righting slider 10. One side of the outer wall of the righting slider 10 abuts against the inner wall of the cylinder sleeve 7, and a self-aligning lower joint 13 is rotatably connected inside the self-aligning sleeve 12. The upper surface of the transition joint 3 abuts against the outer wall of the sealing ring 2 of the upper joint 1, a U-shaped sealing ring 9 is provided inside the cone 6, and a thermal expansion liquid 8 is provided inside the U-shaped sealing ring 9.
[0026] Specifically, under the action of the preload force of the righting slider spring 11, the righting slider 10 ensures that the packer is firmly located in the center of the wellbore and effectively buffers the influence of the vibration from the lower tail pipe on the sealing effect of the sealing sleeve 4. When high-temperature and high-pressure steam is ejected from the tail pipe below the packer, the violent swinging and rotation caused by it will cause stress to concentrate at the root of the lower joint of the packer, which may cause fatigue fracture of the lower joint. These stresses can be effectively resolved by the spherical bearing between the self-aligning lower joint 13 and the self-aligning sleeve 12.
[0027] Working principle: When it is necessary to use a high-strength sealing anti-detachment and righting thermal recovery packer, when high-temperature and high-pressure steam passes through the packer, the thermal expansion liquid 8 vaporizes, thereby generating a huge thrust in the annular space between the cylinder sleeve 7 and the U-shaped sealing ring 9, the U-shaped sealing ring 9 is fixed, and the resistance is lost from the threaded part, and then the U-shaped sealing ring 9 pushes the cone 6 to move so that the cone 6 is inserted into the sealing sleeve 4, so that the sealing sleeve 4 opens and fits tightly against the well wall, achieving a sealing effect, thereby reducing heat loss and improving the performance of the packer. The righting slider 10 is under the preload of the righting slider spring 11, so that the packer is always in the center of the wellbore, achieving the effect of improving work efficiency. The slider spring 11 can also absorb part of the force generated by the vibration of the tail, thereby improving the working stability of the packer. After the steam injection is completed, the temperature drops and the volume of the thermal expansion liquid 8 decreases, so that the cone 6 retracts into the cylinder sleeve 7 under the influence of gravity and negative pressure, and the sealing sleeve 4 returns to its original position, thereby achieving the effect of automatic unlocking of the packer and improving the practicality of the packer. The high-temperature steam ejected from the tail of the packer will generate vibration stress, causing the tail of the packer to swing and rotate violently, which in turn causes the lower joint of the packer to be prone to fatigue fracture. The spherical bearing formed by the self-aligning lower joint 13 and the self-aligning sleeve 12 can effectively resolve this stress, thereby extending the service life of the packer.
[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A high-strength sealing anti-dropout and righting thermal recovery packer, comprising an upper joint (1), characterized in that: An upper joint sealing ring (2) is arranged inside the upper joint (1), a transition joint (3) is fixedly connected inside the upper joint (1), a sealing sleeve (4) is arranged inside the transition joint (3), a center pipe (5) is threadedly connected to the inner wall of the transition joint (3), an aligning sleeve (12) is threadedly connected to the inner wall of the center pipe (5), a cone (6) is arranged on the outer wall of the center pipe (5), a cylinder sleeve (7) is arranged on the outer wall of the cone (6), and a straightening slider (10) is arranged inside the center pipe (5).
2. A high-strength sealing anti-detachment and righting thermal recovery packer according to claim 1, characterized in that: The straightening slider (10) is provided with a plurality of straightening slider springs (11).
3. A high-strength sealing anti-detachment and righting thermal recovery packer according to claim 2, characterized in that: A plurality of the straightening slider springs (11) are linearly distributed inside the straightening slider (10).
4. A high-strength sealing anti-detachment and righting thermal recovery packer according to claim 1, characterized in that: The outer wall of the central tube (5) is threadedly connected with a self-aligning sleeve (12), and the inner wall of the self-aligning sleeve (12) is rotatably connected to the outer wall of the straightening slider (10).
5. A high-strength sealing anti-detachment and righting thermal recovery packer according to claim 4, characterized in that: One side of the outer wall of the straightening slider (10) abuts against the inner wall of the cylinder sleeve (7).
6. A high-strength sealing anti-detachment and righting thermal recovery packer according to claim 5, characterized in that: The center-aligning sleeve (12) is rotatably connected to a center-aligning lower joint (13).
7. A high-strength sealing anti-detachment and righting thermal recovery packer according to claim 1, characterized in that: The upper surface of the transition joint (3) abuts against the outer wall of the upper joint sealing ring (2).
8. The high-strength sealing anti-detachment and righting thermal recovery packer according to claim 1, characterized in that: A U-shaped sealing ring (9) is arranged inside the cone (6), and a thermal expansion liquid (8) is arranged inside the U-shaped sealing ring (9).