An in-line float collar

Abstract

The utility model discloses an embedded float collar, it includes support body, has the mounting hole that penetrates along the axial direction, the connecting cone has the central hole that penetrates along the axial direction and with the mounting hole axis line is collinear, the connecting cone gradually increases from outside to inside diameter, the inner end of connecting cone is connected with support body, slip, the outside of connecting cone outer end is covered, float valve, can removeable installation in the mounting hole, and be used for sealing the mounting hole and the central hole, spring, make the float valve have the tendency of moving to the connecting cone. The utility model discloses by setting up connecting cone and slip, make support body not need to process and use the buckle type of sleeve pipe consistent, only need to use the sleeve inner diameter in the sleeve inner diameter range of embedded float collar corresponding can install and use, directly installs in the sleeve pipe and goes down with sleeve pipe and uses when using can.

Description

Technical Field

[0001] This utility model relates to the field of downhole tools for oil and gas, specifically to an embedded float ring. Background Technology

[0002] In the process of oil and gas exploration and development, cementing tools such as float collars and float shoes are frequently used. Float collars and float shoes are essentially one-way valves installed on and operating on the cementing casing string.

[0003] Currently, conventional float collars are fabricated with male and female threads. During use, the male thread of the float collar is connected to the female thread section of the casing through a snap-fit ​​connection. As the casing is lowered to the designed well depth, cementing operations are carried out. Cement slurry is then passed through the casing to the casing annulus to seal the casing and well wall. Before the cement slurry solidifies, the float collar acts as a one-way valve, preventing the cement slurry from flowing back into the casing before solidification.

[0004] Conventional float collars require a thread type that matches the casing being used for connection. However, in actual oil and gas exploration and development, the casing specifications and thread types used in different regions and well types often vary. This means that a float collar with a corresponding thread type needs to be specially manufactured for each different casing specification and thread type, which undoubtedly increases the cost and time of production and manufacturing. Furthermore, during field operations, if unforeseen circumstances such as temporary changes in casing thread type occur, conventional float collars may be unable to match the new thread type in time, affecting the smooth progress of cementing operations and thus delaying the entire oil and gas well exploration and development schedule, resulting in significant economic losses for the company. Utility Model Content

[0005] The purpose of this invention is to provide an embedded floating hoop to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides an embedded floating hoop, which includes: The support body has a mounting hole that extends through the axis; A connecting cone has a central hole that extends axially and is collinear with the axis of the mounting hole. The diameter of the connecting cone gradually increases from the outside to the inside. The inner end of the connecting cone is connected to the support body. The clasp is fitted onto the outer side of the outer end of the connecting cone. A float valve, movably mounted in the mounting hole and used to seal the mounting hole and the center hole; The spring causes the float valve to tend to move toward the connecting cone.

[0007] Furthermore, the support body and the connecting cone are connected by a sealing connector. The sealing connector has an axially penetrating connecting hole that is collinear with the axis of the mounting hole. The connecting hole is funnel-shaped and adapted to the float valve.

[0008] Furthermore, the outer surface of the sealing connector is provided with external locking teeth, and the inner wall of the support body and the inner wall of the connecting cone are both provided with internal locking teeth, the internal locking teeth being adapted to the external locking teeth.

[0009] Furthermore, the slip and the connecting cone are connected by a supporting cone, the outer end of the supporting cone is inserted into the interior of the slip, the outer side of the supporting cone is flush with the outer side of the slip, and the inner side of the supporting cone is adapted to the outer side of the connecting cone.

[0010] Furthermore, one-way ratchet teeth are provided on the inner side of the supporting cone and the outer side of the connecting cone to lock the locking position of the slip.

[0011] Furthermore, the outer end face of the supporting cone has an inclined surface that extends upward from the outside to the inside.

[0012] Furthermore, an installation groove is formed on the outer end face of the sealing connector, the installation groove corresponds to the inner end face of the connecting cone, and an O-ring is provided in the installation groove.

[0013] The beneficial effects of this utility model are as follows: By setting the connecting cone and slip, this utility model eliminates the need for the support body to be machined with the same thread type as the casing used. It can be installed and used as long as the inner diameter of the casing used is within the range of the inner diameter of the casing corresponding to the embedded float collar. When in use, it can be directly installed in the casing and used when the casing is lowered into the cementing well. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0015] The components are: 1. Support body; 2. Connecting cone; 3. Slipper; 4. Float valve; 5. Spring; 6. Sealing connector; 7. Supporting cone; 8. O-ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0018] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0019] like Figure 1 As shown, this utility model discloses an embedded floating hoop, which includes: Support body 1 has a mounting hole that extends through the axis; The connecting cone 2 has a central hole that runs through the axis and is collinear with the axis of the mounting hole. The diameter of the connecting cone 2 gradually increases from the outside to the inside. The inner end of the connecting cone 2 is connected to the support body 1. The clasp 3 is fitted onto the outer side of the outer end of the connecting cone 2; Float valve 4 is movably installed in the mounting hole and is used to seal the mounting hole and the center hole; Spring 5 causes the float valve 4 to tend to move toward the connecting cone 2.

[0020] During cementing operations, the connecting cone 2 and support body 1 of the embedded float valve 4 are installed together. The installation tool is connected to the connecting cone 2, with the outer cylinder of the installation tool abutting the outer end face of the slip 3. The inner wall of the casing female thread section is cleaned, and the embedded float collar and installation tool are inserted straight into the inner wall of the casing. The installation tool is connected to a hand pump for pressurization. The outer cylinder of the installation tool remains stationary against the slip 3, and the mandrel pulls the connecting cone outward. The slip 3 expands along the slope of the connecting cone 2, adhering to and tightly gripping the casing wall. The final pressurization and settling pressure varies depending on the casing size. In this embodiment, the maximum outer diameter of the connecting cone 2 is adapted to the outer diameter of the support body 1. The slip 3 can be a friction slip 3. The float valve 4 and spring 5 are existing technologies and will not be described further here.

[0021] This utility model, by setting the connecting cone 2 and the slip 3, makes the support body 1 not need to be processed with the same thread type as the casing used. It can be installed and used as long as the inner diameter of the casing used is within the range of the inner diameter of the casing corresponding to the embedded float collar. When in use, it can be directly installed in the casing and used when the casing is lowered into the cementing well.

[0022] In one embodiment, the support 1 and the connecting cone 2 are connected by a sealing connector 6. The sealing connector 6 has an axially penetrating connecting hole that is collinear with the axis of the mounting hole. The connecting hole is funnel-shaped and adapted to the float valve 4. This allows for a tighter and more precise fit between the float valve 4 and the connecting hole.

[0023] In one embodiment, the sealing connector 6 has external locking teeth on its outer surface, and both the inner walls of the support body 1 and the connecting cone 2 have internal locking teeth, which are adapted to the external locking teeth. The sealing connector 6 is first inserted and installed inside the support body 1, and then the connecting cone 2 is inserted and installed onto the sealing connector 6 before proceeding to the next step. This structure has higher connection strength and reliability. In the complex environment downhole, mechanical interlocking can better resist the effects of factors such as pressure, vibration, and impact, preventing the sealing connector 6 from loosening or separating from the support body 1 and the connecting cone 2, and ensuring the overall structural stability of the float collar.

[0024] In one embodiment, the slip 3 and the connecting cone 2 are connected by a supporting cone 7. The outer end of the supporting cone 7 is inserted into the interior of the slip 3, and the outer surface of the supporting cone 7 is flush with the outer surface of the slip 3. The inner surface of the supporting cone 7 is adapted to the outer surface of the connecting cone 2. Specifically, an annular groove extending from the outside to the inside is formed at the outer end of the supporting cone 7, and the slip 3 is fitted onto the outside of this annular groove. A retaining tooth is also provided on this annular groove, and a retaining groove is formed on the inner side of the slip 3, which is adapted to the retaining tooth. When subjected to external force, the retaining tooth can be tightly embedded in the retaining groove, preventing relative movement between the slip 3 and the supporting cone 7, thus ensuring the stability and reliability of the connection structure.

[0025] In one embodiment, both the inner surface of the supporting cone 7 and the outer surface of the connecting cone 2 are provided with one-way ratchet teeth for locking the slip 3 in the seated position. This ensures that the supporting cone 7 can only move upwards along the connecting cone 2 and cannot move downwards, thus locking the slip 3 in the seated position.

[0026] In this embodiment, the ratchet teeth have a certain tilt angle, and their tilt direction is opposite to the movement direction of the slip 3. During the upward movement of the slip 3 along the connecting cone 2 driven by the support cone 7, the inclined surface of the ratchet teeth guides the support cone 7 smoothly through without generating significant resistance. Once the slip 3 reaches the predetermined sitting position, pressure is released, at which point the one-way ratchet teeth come into play. Due to the tilt design of the ratchet teeth, the edge of the support cone 7 abuts against the vertical surface of the ratchet teeth, generating strong resistance and preventing the support cone 7 from moving downwards along the connecting cone 2. This means that only one-way movement of the slip 3 is allowed, and reverse movement is not permitted, thus firmly locking the slip 3 in the sitting position and ensuring the stable fixation of the float band within the well.

[0027] In one embodiment, the outer end face of the support cone 7 is formed with an inclined surface extending upward from the outside to the inside. During the fixing operation, it is convenient to install the outer cylinder of the tool against the outer end face of the support cone 7 and the slip 3.

[0028] In one embodiment, an installation groove is formed on the outer end face of the sealing connector 6, corresponding to the inner end face of the connecting cone 2, and an O-ring 8 is provided in the installation groove. During the assembly stage of the float ring, the O-ring 8 is carefully installed into the pre-formed installation groove on the outer end face of the sealing connector 6. Then, the connecting cone 2 is mated with the sealing connector 6, so that the inner end face of the connecting cone 2 is tightly fitted with the outer end face of the sealing connector 6. At this time, the O-ring 8 is squeezed between the installation groove and the inner end face of the connecting cone 2, and can still maintain good sealing performance under high pressure.

[0029] In this embodiment of the invention, the embedded floating clamp is directly installed on the inner diameter wall of the sleeve female thread end using an installation tool before the sleeve is lowered. The installation and usage steps are as follows: First, the sealing connector 6 is inserted into the support body 1. Then, the installation tool is connected to the connecting cone 2. The outer cylinder of the installation tool abuts against the outer end face of the support cone 7 and the slip 3.

[0030] Clean the inner wall of the sleeve female thread section, apply grease to the O-ring 8 and place it into the mounting groove on the sealing connector 6. Then, insert the connecting cone 2 into the sealing connector 6, ensuring that the inner end face of the connecting cone 2 is tightly fitted with the outer end face of the sealing connector 6. Finally, place the embedded floating hoop and installation tools straight into the inner wall of the sleeve.

[0031] Connect the installation tool to the hand pump for pressurization. Keep the outer cylinder of the installation tool pressed against the slip 3 without moving it. Pull the mandrel outward by pulling the connecting cone. The supporting cone 7 expands uphill along the connecting cone 2. The slip 3 adheres to and tightly grips the sleeve wall. The final pressurization pressure varies depending on the size of the sleeve.

[0032] After depressurization, because the outer surfaces of the support cone 7 and the connecting cone 2 have one-way ratchet teeth, the slip 3 can only move upward along the connecting cone 2 and cannot move downward, thus locking the slip 3 in the seated position.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An embedded floating hoop, characterized in that: include: The support body has a mounting hole that extends through the axis; A connecting cone has a central hole that extends axially and is collinear with the axis of the mounting hole. The diameter of the connecting cone gradually increases from the outside to the inside. The inner end of the connecting cone is connected to the support body. The clasp is fitted onto the outer side of the outer end of the connecting cone. A float valve, movably mounted in the mounting hole and used to seal the mounting hole and the center hole; The spring causes the float valve to tend to move toward the connecting cone.

2. The embedded floating hoop according to claim 1, characterized in that: The support body and the connecting cone are connected by a sealing connector. The sealing connector has an axially penetrating connecting hole that is collinear with the axis of the mounting hole. The connecting hole is funnel-shaped and adapted to the float valve.

3. The embedded floating hoop according to claim 2, characterized in that: The sealing connector has external locking teeth on its outer surface, and the inner wall of the support body and the inner wall of the connecting cone are both provided with internal locking teeth, which are adapted to the external locking teeth.

4. The embedded floating hoop according to claim 1, characterized in that: The slip and the connecting cone are connected by a supporting cone. The outer end of the supporting cone is inserted into the interior of the slip. The outer side of the supporting cone is flush with the outer side of the slip, and the inner side of the supporting cone is adapted to the outer side of the connecting cone.

5. An embedded floating hoop according to claim 4, characterized in that: One-way ratchet teeth are provided on the inner side of the supporting cone and the outer side of the connecting cone to lock the locking position of the slip.

6. An embedded floating hoop according to claim 4, characterized in that: The outer end face of the supporting cone has an inclined surface that extends upward from the outside to the inside.

7. An embedded floating hoop according to claim 2, characterized in that: An installation groove is provided on the outer end face of the sealing connector, and the installation groove corresponds to the inner end face of the connecting cone. An O-ring is provided in the installation groove.

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