A liner top packer

Abstract

This utility model relates to the field of tailpipe top packer technology, specifically to a tailpipe top packer, including a packer assembly and a packer main rod within the packer assembly, with a sealing component disposed on the outer side of the packer main rod; the sealing component includes a circular mounting ring, an upper spring fixedly connected to the lower surface of the circular mounting ring, and a conical sealing rubber pad fixedly connected to the bottom end of the upper spring, the conical sealing rubber pads being two in number and corresponding in position, fixedly connected to each other, an annular rubber ring fixedly connected to the outer side of the conical sealing rubber pad, and the inner surface of the circular mounting ring fixedly connected to the side surface of the packer main rod, forming a barrier to block debris through the annular rubber ring, the inclined structure of the conical pad guiding debris to slide off, and the spring ensuring the contact pressure, all together enhancing the effect of protecting against debris.

Description

Technical Field

[0001] This utility model relates to the field of tailpipe top packer technology, and in particular to a tailpipe top packer. Background Technology

[0002] The top packer of the tailpipe is a key tool in oil and gas drilling and completion, its development stemming from the need for sealing the annulus between the tailpipe and the upper casing. Early methods relied on cement return sealing, which suffered from problems such as easy cracking, poor adaptability, difficult maintenance, and low efficiency. To address these issues, mechanical or hydraulic packers emerged, providing reliable sealing, functioning as tailpipe suspension devices, adapting to high-temperature and high-pressure downhole environments, and being compatible with other tools. With the development of complex oil and gas reservoirs, packers are being upgraded towards extreme environment resistance, integration, intelligence, and high environmental protection requirements, making them indispensable equipment in modern well completion.

[0003] Patent CN209430154U discloses a top sealing assembly for a sealing tailpipe hanger, comprising, from top to bottom, a force transmission sleeve, a centralizing ring, an upper spacer ring, an upper bearing ring, a rubber sleeve, a lower bearing ring, and a lower spacer ring on the outer wall of the central tube. The force transmission sleeve is fixed to the centralizing ring, and the upper bearing ring, rubber sleeve, lower bearing ring, and lower spacer ring are sequentially fitted together by inclined surfaces. The lower spacer ring is fixed to the central tube. This invention provides better protection for the sealing rubber sleeve through the cooperation between the various components, significantly improves the annular sealing capability, and enhances the risk resistance.

[0004] While existing packer-type keel top packer assemblies offer better protection for the sealing sleeve and significantly improve annular sealing capabilities and risk resistance through the cooperation of various components, they face several prominent problems in practical use. Specifically, the device lacks sand or debris protection structures. If impurities such as sand or cement blocks are present in the wellbore, they may become embedded in the contact surface between the sleeve and casing, compromising the seal integrity, or enter the gaps between components, causing blockage. Therefore, to address these shortcomings of existing technology, we urgently need an innovative keel top packer to solve these problems. Utility Model Content

[0005] The purpose of this utility model is to provide a top packer for the tailpipe, which solves the problem that the lack of sand-proof or debris-proof structure means that impurities such as sand and cement blocks in the wellbore may embed into the contact surface between the rubber sleeve and the casing, damaging the seal integrity, or enter the gap between components and cause blockage.

[0006] To achieve the above objectives, this utility model provides a tailpipe top packer, including a packer assembly.

[0007] It also includes the main sealing rod in the sealing assembly, and a sealing assembly is provided on the outside of the main sealing rod;

[0008] The sealing assembly includes a circular mounting ring, an upper spring fixedly connected to the lower surface of the circular mounting ring, a conical sealing rubber pad fixedly connected to the bottom end of the upper spring, two conical sealing rubber pads in corresponding positions, a fixed connection between the two conical sealing rubber pads, an annular rubber ring fixedly connected to the outer side of the conical sealing rubber pad, and the inner surface of the circular mounting ring fixedly connected to the side surface of the sealing main rod.

[0009] The upper spring is fixedly connected to the inner wall of the upper conical sealing rubber pad at its bottom end. There are two annular rubber rings in corresponding positions. The two conical sealing rubber pads are fixedly connected to the side surface of the sealing main rod at their connection point. The lower spring is fixedly connected to the inner wall of the lower conical sealing rubber pad.

[0010] The bottom side surface of the sealing main rod is fixedly connected to a semi-enclosed cylinder. There are two semi-enclosed cylinders in corresponding positions. The bottom end of the lower spring is fixedly connected to the top of the two semi-enclosed cylinders. An annular groove is opened on the side surface of the two semi-enclosed cylinders.

[0011] The top side surface of the sealing main rod has four strip-shaped slots, which are evenly distributed on the top side surface of the sealing main rod. A connecting round rod is fixedly connected to the inner wall of the strip-shaped slot, and a cone head is fixedly connected to the bottom of the sealing main rod.

[0012] The connecting rod has a strip-shaped connecting plate that movably passes through its side surface. A friction plate is fixedly connected to the top of the strip-shaped connecting plate. A rubber friction block is fixedly connected to the outer surface of the friction plate. A telescopic rod is fixedly connected to the inner surface of the friction plate. The end of the telescopic rod is fixedly connected to the inner wall of the strip-shaped slot.

[0013] The telescopic rod has a circular connecting ring fixedly connected to its side surface, and a small spring fixedly connected to its side surface. The outer end of the small spring is fixedly connected to the inner surface of the friction plate.

[0014] This utility model discloses a top packer for a tailpipe. The device has a sealing assembly on its outer side, with a circular mounting ring fixed to the packer main rod. Two corresponding and mutually fixed conical sealing rubber pads are connected to the lower surface via an upper spring. An annular rubber ring is connected to the outer side of each pad. During sealing, axial force compresses the spring, causing the conical pads to expand and push the annular rubber ring against the inner wall of the sleeve to achieve a seal. During unsealing, the spring returns to its original position. In this structure, the annular rubber ring forms a barrier to block debris, the inclined structure of the conical pads guides debris to slide off, and the spring ensures the contact pressure, collectively enhancing the debris protection effect. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the main structure of the tailpipe top packer according to an embodiment of the present invention.

[0017] Figure 2 This is a side view of the packer at the top of the tailpipe according to an embodiment of the present invention.

[0018] Figure 3 This is the tailpipe top packer of this utility model embodiment. Figure 2 Enlarged schematic diagram of the structure at point A in the diagram.

[0019] Figure 4 This is a bottom view of the tailpipe top packer according to an embodiment of the present invention.

[0020] Figure 5 This is a top view of the packer at the top of the tailpipe according to an embodiment of the present invention.

[0021] 1. Sealing assembly; 101. Sealing main rod; 102. Semi-enclosed sleeve; 103. Conical head; 104. Annular groove; 105. Strip groove; 106. Connecting round rod; 107. Strip connecting plate; 108. Friction plate; 109. Rubber friction block; 110. Telescopic rod; 111. Circular connecting ring; 112. Small spring; 2. Sealing assembly; 201. Circular mounting ring; 202. Upper spring; 203. Conical sealing rubber gasket; 204. Annular rubber ring; 205. Lower spring. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0023] Please see Figures 1-5 A tailpipe top packer, comprising a packer assembly 1,

[0024] It also includes the sealing main rod 101 in the sealing assembly 1, and a sealing assembly 2 is provided on the outside of the sealing main rod 101;

[0025] The sealing assembly 2 includes a circular mounting ring 201, an upper spring 202 fixedly connected to the lower surface of the circular mounting ring 201, a conical sealing rubber pad 203 fixedly connected to the bottom end of the upper spring 202, two conical sealing rubber pads 203 in corresponding positions, the two conical sealing rubber pads 203 are fixedly connected to each other, an annular rubber ring 204 is fixedly connected to the outer side of the conical sealing rubber pad 203, and the inner surface of the circular mounting ring 201 is fixedly connected to the side surface of the sealing main rod 101.

[0026] The packer assembly 1 provides basic support and installation carrier, while the packer main rod 101 provides installation reference for the sealing assembly 2. In the sealing assembly 2, the circular mounting ring 201 fixes the sealing assembly 2 to the packer main rod 101. When the packer is set, the external force causes the upper spring 202 to compress, which drives the two corresponding conical sealing rubber pads 203 to expand outward, thereby making the outer annular rubber ring 204 tightly fit against the inner wall of the sleeve, achieving annular sealing. When unsealing, the upper spring 202 returns to its original position, the conical sealing rubber pad 203 contracts, and the annular rubber ring 204 disengages from the inner wall of the sleeve, releasing the sealing state.

[0027] Furthermore, the bottom end of the upper spring 202 is fixedly connected to the inner wall of the upper conical sealing rubber pad 203. Two annular rubber rings 204 are present and positioned correspondingly. The connection point of the two conical sealing rubber pads 203 is fixedly connected to the side surface of the sealing main rod 101. A lower spring 205 is fixedly connected to the inner wall of the lower conical sealing rubber pad 203. The bottom end of the upper spring 202 is fixed to the inner wall of the upper conical sealing rubber pad 203, providing elastic driving force for the upper conical sealing rubber pad 203. The two corresponding annular rubber rings 204 enhance the sealing contact area and improve sealing reliability. The connection point of the two conical sealing rubber pads 203 is fixed to the sealing main rod 101 to ensure structural stability. The lower spring 205 on the inner wall of the lower conical sealing rubber pad 203 provides additional elastic support, enhancing the expansion and reset capabilities of the conical sealing rubber pad 203.

[0028] Furthermore, two semi-enclosed cylinders 102 are fixedly connected to the bottom side surface of the packer main rod 101. The lower spring 205 is fixedly connected to the top of the two semi-enclosed cylinders 102 at its bottom. Annular grooves 104 are formed on the side surfaces of both semi-enclosed cylinders 102. The two corresponding semi-enclosed cylinders 102 at the bottom of the packer main rod 101 provide bottom support for the lower spring 205, allowing the elastic force of the lower spring 205 to act stably on the lower conical sealing rubber pad 203. The annular grooves 104 on the side surfaces of the semi-enclosed cylinders 102 can accommodate and limit external mating components, enhancing the connection stability between the packer bottom and other tools.

[0029] Furthermore, four strip-shaped slots 105 are formed on the top side surface of the packer main rod 101, evenly distributed on the top side surface of the packer main rod 101. A connecting round rod 106 is fixedly connected to the inner wall of the strip-shaped slot 105, and a cone head 103 is fixedly connected to the bottom of the packer main rod 101. The four evenly distributed strip-shaped slots 105 on the top of the packer main rod 101 provide installation space for components such as the connecting round rod 106 and the strip connecting plate 107; the connecting round rod 106 provides a movable fulcrum for the strip connecting plate 107; and the cone head 103 at the bottom facilitates the lowering of the packer into the wellbore, reducing downward resistance.

[0030] Furthermore, a strip-shaped connecting plate 107 is movably inserted through the side surface of the connecting rod 106. A friction plate 108 is fixedly connected to the top of the strip-shaped connecting plate 107. A rubber friction block 109 is fixedly connected to the outer surface of the friction plate 108, and a telescopic rod 110 is fixedly connected to the inner surface of the friction plate 108. The end of the telescopic rod 110 is fixedly connected to the inner wall of the strip-shaped slot 105. The strip-shaped connecting plate 107 can rotate around the connecting rod 106. When the packer is lowered or set, the friction plate 108 opens outward under the support of the telescopic rod 110, causing the rubber friction block 109 to contact the inner wall of the casing and generate friction, which plays a role in straightening and preventing slippage. The telescopic rod 110 can adapt to different inner diameters of the casing to ensure effective contact of the friction plate 108.

[0031] Furthermore, a circular connecting ring 111 is fixedly connected to the side surface of the telescopic rod 110, and a small spring 112 is fixedly connected to the side surface of the circular connecting ring 111. The outer end of the small spring 112 is fixedly connected to the inner surface of the friction plate 108. The circular connecting ring 111 fixes the small spring 112 to the telescopic rod 110. The small spring 112 applies an outward elastic force to the friction plate 108, enhancing the adhesion between the rubber friction block 109 and the inner wall of the sleeve, ensuring the stability of the friction straightening effect. At the same time, when the inner diameter of the sleeve changes, the small spring 112 can buffer the movement through telescopic movement, preventing the friction plate 108 from being damaged by excessive force.

[0032] Complete working process: When the packer is lowered into the wellbore, the cone 103 at the bottom of the packer main rod 101 reduces the downward resistance, facilitating the smooth lowering of the equipment; at the same time, the friction plate 108 in the top strip slot 105, under the elastic force of the small spring 112, opens outward through the strip connecting plate 107 around the connecting round rod 106, so that the rubber friction block 109 contacts the inner wall of the casing to generate friction. With the extension and retraction adjustment of the telescopic rod 110, the packer is straightened and prevented from moving during the downward process. When the sealing operation is performed, the external force is transmitted to the sealing main rod 101 through the sealing component 1, causing the sealing component 2 to start working: the circular mounting ring 201 is fixed to the sealing main rod 101 to provide stable support, the upper spring 202 is compressed to generate elastic driving force, pushing the upper conical sealing rubber pad 203 to expand outward; at the same time, the lower conical sealing rubber pad 203 expands synchronously under the action of the lower spring 205 supported by the semi-encasing 102. The two conical sealing rubber pads 203 work together through the fixed connection part to drive the two corresponding annular rubber rings 204 on the outside to tightly fit against the inner wall of the sleeve, forming a double seal and achieving effective annular sealing. When the seal is released, the external force is removed, the upper spring 202 and the lower spring 205 return to their original position and retract, causing the two conical sealing rubber pads 203 to retract inward, and the annular rubber ring 204 to detach from the inner wall of the casing, thus releasing the seal. At the same time, the friction plate 108, constrained by the inner wall of the casing, retracts and resets through the telescopic rod 110 and the small spring 112, facilitating the removal of the packer as a whole.

[0033] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tailpipe top packer, comprising a packer assembly, characterized in that, It also includes the main sealing rod in the sealing assembly, and a sealing assembly is provided on the outside of the main sealing rod; The sealing assembly includes a circular mounting ring, an upper spring fixedly connected to the lower surface of the circular mounting ring, a conical sealing rubber pad fixedly connected to the bottom end of the upper spring, two conical sealing rubber pads in corresponding positions, a fixed connection between the two conical sealing rubber pads, an annular rubber ring fixedly connected to the outer side of the conical sealing rubber pad, and the inner surface of the circular mounting ring fixedly connected to the side surface of the sealing main rod.

2. The tailpipe top packer as described in claim 1, characterized in that, The bottom end of the upper spring is fixedly connected to the inner wall of the upper conical sealing rubber pad. There are two annular rubber rings in corresponding positions. The connection between the two conical sealing rubber pads is fixedly connected to the side surface of the sealing main rod. The inner wall of the lower conical sealing rubber pad is fixedly connected to the lower spring.

3. The tailpipe top packer as described in claim 2, characterized in that, The bottom side surface of the sealing main rod is fixedly connected to a semi-enclosed cylinder. There are two semi-enclosed cylinders in corresponding positions. The bottom end of the lower spring is fixedly connected to the top of the two semi-enclosed cylinders. An annular groove is opened on the side surface of the two semi-enclosed cylinders.

4. The tailpipe top packer as described in claim 1, characterized in that, The top side surface of the sealing main rod has four strip-shaped slots, which are evenly distributed on the top side surface of the sealing main rod. A connecting round rod is fixedly connected to the inner wall of the strip-shaped slot, and a cone head is fixedly connected to the bottom of the sealing main rod.

5. The tailpipe top packer as described in claim 4, characterized in that, A strip-shaped connecting plate is movably connected through the side surface of the connecting rod. A friction plate is fixedly connected to the top of the strip-shaped connecting plate. A rubber friction block is fixedly connected to the outer surface of the friction plate. A telescopic rod is fixedly connected to the inner surface of the friction plate. The end of the telescopic rod is fixedly connected to the inner wall of the strip-shaped slot.

6. The tailpipe top packer as described in claim 5, characterized in that, A circular connecting ring is fixedly connected to the side surface of the telescopic rod, and a small spring is fixedly connected to the side surface of the circular connecting ring. The outer end of the small spring is fixedly connected to the inner surface of the friction plate.

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