Hydraulic permanent type gas well packer

Abstract

The invention discloses a hydraulic permanent type gas well packer which comprises a setting mechanism, a sealing mechanism and an anchoring mechanism. The setting mechanism comprises an upper central pipe and a lower central pipe, and the upper central pipe is in threaded connection with the lower central pipe; the sealing mechanism comprises a rubber sleeve assembly, and the rubber sleeve assembly is arranged on the outer wall of the upper center pipe in a sleeving mode and enables the two ends of the rubber sleeve assembly to form an upper annulus and a lower annulus respectively after setting. The anchoring mechanism comprises a locking ring assembly and C-shaped slips arranged in pairs, the two C-shaped slips are arranged on the two sides of the rubber sleeve assembly respectively and detachably connected with the upper center pipe, the tooth top directions of the two C-shaped slips are opposite, and the upper center pipe is sleeved with the locking ring assembly which is used for limiting displacement of the C-shaped slips. Due to the fact that the two C-shaped slips with the tooth tips opposite in direction are arranged, more meshing points are increased, setting of the packer is more stable, and the risk of sealing loss is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of packers, and in particular to a hydraulic permanent gas well packer. Background Art

[0002] Gas well packers are a kind of completion tools in oil drilling projects, mainly used for completion, production and suspension of gas storage systems. Since the well conditions in different regions vary greatly, the packers in gas storages need to have higher reliability and safety.

[0003] The invention patent with publication number CN110821440B publicly authorizes a packer, which comprises a packer body, a first fixing component, a second fixing component and a control component to form the main structure of the packer; further, the control component is connected with the first regulating chamber, and the liquid enters the first regulating chamber and squeezes the slider, so that the slider drives the cava to move in a direction perpendicular to the axis of the packer body, so that it is firmly pressed against the inner wall of the pipeline, thereby enhancing the stability of the connection between the packer and the pipeline during the sealing process.

[0004] However, the slips in the above-mentioned packer cannot be guaranteed to be evenly broken during the actual setting, and the slips are broken into several pieces after breaking, with a small contact area with the casing and limited anchoring force, which is prone to unreliable anchoring, thereby causing the hidden danger of loss of sealing; in addition, since the packer needs to pass through adjacent components before the force is transmitted to the slips during the process of bearing loads, the risk of loss of sealing is also increased. That is, the above-mentioned structure cannot effectively suppress the risk of loss of sealing and enhance the stability of setting. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a hydraulic permanent gas well packer to solve the technical problems in the prior art that the risk of losing the seal cannot be effectively suppressed and the stability of the seal cannot be enhanced.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a hydraulic permanent gas well packer, comprising a setting mechanism, a sealing mechanism and an anchoring mechanism; the setting mechanism comprises an upper center tube and a lower center tube, and the upper center tube is threadedly connected to the lower center tube; the sealing mechanism comprises a rubber sleeve assembly, and the rubber sleeve assembly is sleeved on the outer wall of the upper center tube so that the rubber sleeve assembly forms an upper annulus and a lower annulus at both ends after setting; the anchoring mechanism comprises a locking ring assembly and a C-type slip arranged in pairs, the two C-type slips are arranged on both sides of the rubber sleeve assembly and are detachably connected to the upper center tube, the tooth tips of the two C-type slips are arranged in opposite directions, and the locking ring assembly is sleeved on the upper center tube and is used to limit the displacement of the C-type slips.

[0007] In some embodiments, the locking ring assembly includes a locking ring, a locking ring seat and a limit member, one end of the locking ring seat is connected to the lower center tube, the other end of the locking ring seat is connected to the C-shaped cava located on the lower side of the rubber cylinder assembly, the outer end thread of the locking ring is threadedly connected to the upper center tube, the inner end thread of the locking ring is threadedly connected to the locking ring seat, and the limit member is inserted into the locking ring and the locking ring seat and limits the rotation of the locking ring.

[0008] In some embodiments, the locking ring is a C-shaped structure.

[0009] In some embodiments, the thread of the locking ring is a unidirectional tooth profile, and the thread profile of the locking ring is opposite to the tooth profile of the upper center pipe.

[0010] In some embodiments, the limiting member is configured as a hexagon socket head screw.

[0011] In some embodiments, the C-type slips are barrel-shaped.

[0012] In some embodiments, a shear pin is connected between the C-type slip and the upper center pipe.

[0013] In some embodiments, a connecting sleeve, a piston sleeve and a piston are provided between the upper center tube and the lower center tube, and the two ends of the connecting sleeve are threadedly connected to the piston sleeve and the locking ring seat respectively. The connecting sleeve, the piston sleeve and the piston form a piston structure and are slidably sleeved in the upper center tube and the lower center tube.

[0014] In some embodiments, the sealing mechanism further includes an O-ring, and the O-ring is sleeved on the outer wall of the lower center tube.

[0015] In some embodiments, the O-rings are provided in pairs.

[0016] Compared with the prior art, the hydraulic permanent gas well packer provided by the present invention has C-type slips arranged in pairs, and the tooth tips of the two C-type slips are arranged in opposite directions, so that the two C-type slips limit the axial movement of the packer; further, by providing a locking ring assembly and sleeved on the upper center pipe and used to limit the downward displacement of the C-type slips, the risk of loss of sealing is effectively suppressed and the stability of the sealing is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a partial cross-sectional view of a hydraulic permanent gas well packer provided by an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of the medium C-type slip; Description of reference numerals: 100, sealing mechanism; 110, upper center tube; 120, lower center tube; 200, sealing mechanism; 210, rubber cylinder assembly; 220, O-ring; 300, anchoring mechanism; 310, locking ring assembly; 311, locking ring; 312, locking ring seat; 313, limiter; 320, C-type slip; 400, shear pin; 500, connecting sleeve; 600, piston sleeve; 700, piston; 800, anti-drilling mechanism; 810, pressure plate; 820, hexagon socket flat-end set screw. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem of being unable to effectively suppress the risk of seal failure and enhance the stability of seal setting, the present invention provides a hydraulic permanent gas well packer that can effectively suppress the risk of seal failure and enhance the stability of seal setting.

[0020] It should be noted that the hydraulic permanent gas well packer described in the present invention is used for but not limited to gas well packers, etc. For the convenience of explanation, in the present invention, only a hydraulic permanent gas well packer applied to gas well packer equipment is used as an example for explanation, and the principle of applying a hydraulic permanent gas well packer to other types of equipment is essentially the same as the principle applied to gas well packer equipment, which will not be repeated here.

[0021] See also Figure 1 , Figure 1 It is a partial cross-sectional view of a hydraulic permanent gas well packer in one embodiment of the present invention, a hydraulic permanent gas well packer, including a sealing mechanism 100, a sealing mechanism 200 and an anchoring mechanism 300; the sealing mechanism 100 includes an upper center pipe 110 and a lower center pipe 120, and the upper center pipe 110 is threadedly connected to the lower center pipe 120; the sealing mechanism 200 includes a rubber sleeve assembly 210, the rubber sleeve assembly 210 is sleeved on the outer wall of the upper center pipe 110 and makes the rubber sleeve assembly 210 form an upper annulus and a lower annulus at both ends after the sealing; the anchoring mechanism 300 includes a locking ring assembly 310 and a C-type slip 320 arranged in pairs, the two C-type slips 320 are arranged on both sides of the rubber sleeve assembly 210 and are detachably connected to the upper center pipe 110, the tooth tips of the two C-type slips 320 are arranged in opposite directions, the locking ring assembly 310 is sleeved on the upper center pipe 110 and is used to limit the displacement of the C-type slip 320.

[0022] In this embodiment, the present invention provides a hydraulic permanent gas well packer, which is provided by C-type cava 320 arranged in pairs, and the tooth tips of the two C-type cava 320 are arranged in opposite directions, so that the two C-type cava 320 limit the axial movement of the packer; further, by providing a locking ring assembly 310 and sleeved on the upper center pipe 110 and used to limit the displacement of the C-type cava 320, the risk of losing the seal is effectively suppressed, and the stability of the setting is improved (that is, the stability of the sealing function of the packer after the setting, which will not be repeated below).

[0023] In one embodiment, see Figure 1 The locking ring assembly 310 includes a locking ring 311, a locking ring seat 312 and a limit piece 313. The locking ring seat 312 is connected to the lower center tube 120, and the other end of the locking ring seat 312 is connected to the C-shaped cava 320 located on the lower side of the rubber cylinder assembly 210. The outer end thread of the locking ring 311 is threadedly connected to the upper center tube 110, and the inner end thread of the locking ring 311 is threadedly connected to the locking ring seat 312. The limit piece 313 is inserted into the locking ring 311 and the locking ring seat 312 and limits the rotation of the locking ring 311.

[0024] In this embodiment, by moving the lock ring 311 and the lock ring seat 312 upward to form a locking structure with the upper central pipe 110, when the packer is loaded, the load is directly transmitted to the C-type slip 320 through the locking structure, and the force transmission process does not need to pass through the components at the lower end of the locking structure, thereby reducing the risk of failure and improving the overall load-bearing capacity of the packer (the force transmission process is: central pipe 110 → lock ring 311 → lock ring seat 312 → C-type slip 320 located below the rubber cartridge assembly 210) In one embodiment, see Figure 1 , the locking ring 311 is a C-shaped structure.

[0025] In one embodiment, see Figure 1 The thread of the locking ring 311 is a one-way tooth shape, and the thread tooth shape of the locking ring 311 is opposite to the tooth direction of the upper center pipe 110.

[0026] In one embodiment, see Figure 1 The limiting member 313 is configured as a hexagon socket head screw.

[0027] In this embodiment, the internal and external threads of the locking ring 311 are both one-way tooth shapes similar to a ratchet mechanism. The external serrations are connected to the locking ring seat 312, and its rotation is limited by the hexagonal cylindrical head screw. The internal serrations are aligned with the upper center tube, and the tooth directions are opposite, so it can only move in one direction. After sealing, the anchoring mechanism 300 cannot move downward, which effectively improves the stability of the packer after sealing.

[0028] In one embodiment, see Figure 1 , Figure 2, C-type Cava 320 is barrel-shaped.

[0029] In this embodiment, the C-type slip 320 is barrel-shaped, has more bite points, is easy to open when sealing, will not break, and evenly fits the casing (the pipe that must be lowered for downhole operations) when sealing, ensuring stability after sealing.

[0030] In one embodiment, see Figure 1 A shear pin 400 is connected between the C-type slip 320 and the upper center pipe 110 .

[0031] In this embodiment, a large number of shear pins 400 are present at the connection points of various parts, and are used to achieve local connection and shearing after pressing.

[0032] In one embodiment, see Figure 1 A connecting sleeve 500, a piston sleeve 600 and a piston 700 are provided between the upper center tube 110 and the lower center tube 120. The two ends of the connecting sleeve 500 are threadedly connected to the piston sleeve 600 and the locking ring seat 312 respectively. The connecting sleeve 500, the piston sleeve 600 and the piston 700 form a piston structure and are slidably sleeved in the upper center tube 110 and the lower center tube 120.

[0033] In this embodiment, the composition of the piston structure is conducive to achieving a greater setting force under the same setting pressure, thereby facilitating the setting of the packer and facilitating the stability and feasibility of the setting.

[0034] In one embodiment, see Figure 1 The sealing mechanism 200 further includes an O-ring 220 , which is sleeved on the outer wall of the lower center tube 120 .

[0035] In one embodiment, see Figure 1 , O-rings 220 are arranged in pairs.

[0036] In order to facilitate the drilling and removal of the packer, an anti-drilling mechanism 800 is provided, which includes a pressure plate 810 and a hexagon socket flat-end set screw 820. When the packer needs to be drilled out, since the C-type slip 320 is anchored on the casing and cannot rotate, the pressure plate 810 and the C-type slip 320 are fixed on the upper central pipe 110, so the pressure plate 810 fixes the upper central pipe 110 and also cannot rotate, thereby facilitating the drilling and removal of the packer.

[0037] In order to better understand the present invention, the following Figure 1 to Figure 2 The technical solution of the present invention is described in detail: First, when the packer is set, pressure is applied to the oil pipe, and the hydraulic pressure enters the upper piston chamber (the upper piston chamber is the gap between the piston sleeve 600, the upper center tube 110, and the lower center tube 120) through the pressure transmission hole on the upper center tube 110, and the pressure transmission hole on the lower center tube 120 enters the lower piston chamber (the lower piston chamber is the gap between the piston 700 and the lower center tube 120). Due to the pressure difference between the inside and outside of the piston chamber, the corresponding piston structure is pushed upward. When the pressure reaches the shearing value of the shear pin 400, the shear pin 400 is sheared, and the packer starts to be pre-seated.

[0038] Continue to pressurize the oil pipe, the pressure pushes the corresponding piston structure to continue to move upward, and then pushes the C-type slip 320 located below the rubber cylinder assembly 210 to move upward, at this time the shear pin 400 (here the shear pin 400 is the other shear pin 400 provided at the corresponding position in the setting mechanism 100) is cut off, pushing the rubber cylinder assembly 210 to continue to move upward, and after the whole continues to move upward, until the rubber cylinder assembly 210 and the C-type slip 320 are completely set. In the above process, since the C-type slips 320 with tooth tips facing each other are arranged in pairs, and the combination design of the lock ring 311 and the lock ring seat 312 makes the packer have no displacement after setting, and the setting is more stable, and the C-type slip 320 makes the bite more uniform, effectively reducing the risk of losing the seal, and effectively improving the stability of the setting.

[0039] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydraulic permanent gas well packer, characterized in that: include: A setting mechanism, the setting mechanism comprising an upper center tube and a lower center tube, the upper center tube being threadedly connected to the lower center tube; A sealing mechanism, the sealing mechanism comprising a rubber sleeve assembly, the rubber sleeve assembly being sleeved on the outer wall of the upper center pipe so that the two ends of the rubber sleeve assembly after setting respectively form an upper annulus and a lower annulus; and Anchoring mechanism, the anchoring mechanism includes a locking ring assembly and a C-type cava arranged in pairs, the two C-type cava are arranged on both sides of the rubber cylinder assembly and are detachably connected to the upper center tube, the tooth tips of the two C-type cava are arranged in opposite directions, the locking ring assembly is sleeved on the upper center tube and is used to limit the displacement of the C-type cava.

2. A hydraulic permanent gas well packer according to claim 1, characterized in that: The locking ring assembly includes a locking ring, a locking ring seat and a limit piece. One end of the locking ring seat is connected to the lower center tube, and the other end of the locking ring seat is connected to the C-shaped cava located on the lower side of the rubber cylinder assembly. The outer end thread of the locking ring is threadedly connected to the upper center tube, and the inner end thread of the locking ring is threadedly connected to the locking ring seat. The limit piece is inserted into the locking ring and the locking ring seat and limits the rotation of the locking ring.

3. A hydraulic permanent gas well packer according to claim 2, characterized in that: The locking ring is a C-shaped structure.

4. A hydraulic permanent gas well packer according to claim 2, characterized in that: The thread of the locking ring is a one-way tooth shape, and the thread tooth shape of the locking ring is opposite to the tooth direction of the upper center pipe.

5. A hydraulic permanent gas well packer according to claim 2, characterized in that: The limiting member is configured as a hexagon socket head screw.

6. A hydraulic permanent gas well packer according to claim 1, characterized in that: The C-type slip is barrel-shaped.

7. A hydraulic permanent gas well packer according to claim 1, characterized in that: A shear pin is connected between the C-shaped slip and the upper center pipe.

8. A hydraulic permanent gas well packer according to claim 2, characterized in that: A connecting sleeve, a piston sleeve and a piston are provided between the upper center tube and the lower center tube. The two ends of the connecting sleeve are respectively threadedly connected to the piston sleeve and the locking ring seat. The connecting sleeve, the piston sleeve and the piston form a piston structure and are slidably sleeved in the upper center tube and the lower center tube.

9. A hydraulic permanent gas well packer according to claim 1, characterized in that: The sealing mechanism also includes an O-ring, and the O-ring is sleeved on the outer wall of the lower center tube.

10. A hydraulic permanent gas well packer according to claim 9, characterized in that: The O-rings are arranged in pairs.

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