Integral rescue base flange

Abstract

This utility model provides an integrated emergency bottom flange, including an upper connecting flange, a slip seat, a tapered slip assembly, a sealing rubber sleeve, and a rubber sleeve cap. The slip seat has an inverted conical hole for installing the tapered slip assembly and an annular stepped hole for installing the sealing rubber sleeve. The sealing rubber sleeve is equipped with double rubber seals. The rubber sleeve cap is connected to the slip seat and is used to tighten the sealing rubber sleeve. This utility model improves sealing reliability by designing a BT seal and a three-stage sealing barrier with a double-stage sealing rubber sleeve. It allows for casing sealing pressure testing before well shut-in, and can inject grease to achieve secondary sealing in case of leakage during operation. The main sealing rubber sleeve can be replaced separately if it fails. The integrated emergency bottom flange and the wellhead blowout preventer are installed as a single unit, which is more convenient and faster than traditional bottom flange installation, greatly shortening the emergency installation time and improving the success rate of emergency repairs.

Description

Technical Field

[0001] This utility model relates to the field of emergency rescue technology after oil and gas well blowout, and in particular to an integral emergency bottom flange. Background Technology

[0002] After an oil and gas well blowout, if it catches fire out of control, it will damage well site equipment and render the wellhead equipment unusable. In this case, the original wellhead equipment should be removed and a new wellhead equipment installed as soon as possible to restore control of the blowout-out well. If the bottom flange of the wellhead is damaged, it needs to be cut off and removed, and a new bottom flange needs to be installed to provide conditions for the installation and fixation of the well control blowout preventer. Currently, there are integrated bottom flanges for oil and gas well blowout emergency repairs (201821966874.2), integrated wellhead devices for oil and gas well emergency repairs (201811427363.8), and an oil and gas well emergency casing head (200720080185.7) suitable for resetting the wellhead during oil and gas well blowout emergency repairs after casing cutting.

[0003] However, existing technologies have technical difficulties such as low success rate of installing bottom flanges on bare casing, insufficient reliability of bottom flange sealing, and difficulties in wellhead installation under blowout runaway conditions. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to solve the problems existing in the prior art. For example, the purpose of this utility model is to provide a bottom flange suitable for emergency repairs of smooth casing, solving problems such as difficulty in centering during bottom flange resetting, insufficient device stability, and long installation time. The device ensures personnel safety, is easy to install, and has high reliability during installation and use, effectively controlling blowout accidents, improving the timeliness and effectiveness of blowout accident emergency response, and avoiding greater economic losses and resource waste.

[0005] To achieve the above objectives, this utility model provides an integral emergency rescue bottom flange, including an upper connecting flange, a slip seat, a tapered slip assembly, slip seat connecting bolts, a sealing rubber sleeve, and a rubber sleeve cover;

[0006] The upper connecting flange and the slip seat are fixedly connected by the slip seat connecting bolts;

[0007] The slip seat is hollow, with an inverted conical hole at the upper end for installing the conical slip assembly, and an annular stepped hole at the lower end for installing the sealing sleeve;

[0008] The rubber sleeve cap is connected to the slip seat and is used to press and seal the rubber sleeve.

[0009] Furthermore, the upper end face of the upper connecting flange is connected with wellhead connecting bolts, and the side is provided with a pressure test hole, a BT sealing ring and an upper connecting flange grease injection valve. The BT sealing ring adopts a type B double contact sealing design.

[0010] Furthermore, a rubber sleeve sealing test hole is provided in the middle of the outer circle of the slip seat, and a slip seat grease injection valve is installed. The slip seat grease injection valve is a one-way valve design.

[0011] Furthermore, the conical slip assembly is formed by cutting a whole circle into four segments, and the slit width meets the sleeve clamping requirements.

[0012] Furthermore, the sealing tube is provided with upper and lower double rubber seals, and a metal gasket is provided in the middle, with an opening in the middle of the metal gasket.

[0013] Furthermore, a slip seat gasket is installed between the upper connecting flange and the slip seat.

[0014] Furthermore, the clasp seat cover adopts a hollow two-part design.

[0015] Furthermore, the rubber sleeve cap has a hollow design, with an annular boss at the top and a tapered hole at the bottom.

[0016] Furthermore, a rubber tube cover gasket is provided between the rubber tube cover and the clamp seat, and is fixedly connected by rubber tube cover connecting bolts. The rubber tube cover gasket adopts a hollow two-lobed design.

[0017] Furthermore, it also includes a slip seat sealing ring, which is installed on the outer circle above the slip seat.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model features a BT seal and a three-stage sealing barrier with a double-stage sealing sleeve, improving sealing reliability. It allows for casing sealing pressure testing before well shut-in, and secondary sealing can be achieved by injecting grease if leakage occurs during operation. The main sealing sleeve can be replaced separately if it fails. The integrated emergency bottom flange and wellhead blowout preventer are installed as a single unit, which is more convenient and faster than traditional bottom flange installation, greatly shortening the emergency installation time and improving the success rate of emergency repairs. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a detailed structural diagram of the conical slip assembly of this utility model;

[0023] Figure 3 This is a detailed structural diagram of the sealing rubber tube of this utility model;

[0024] Figure 4 This diagram illustrates the connection and installation of the integral emergency bottom flange and well control blowout preventer assembly of this utility model.

[0025] Explanation of main reference numerals: 1. Upper connecting flange; 2. Upper connecting flange grease injection valve; 3. Slip seat; 4. Conical slip assembly; 5. Slip seat grease injection valve; 6. Rubber sleeve gland gasket; 7. Rubber sleeve gland; 8. Rubber sleeve gland connecting bolt; 9. Slip seat connecting bolt; 10. Sealing rubber sleeve; 101. Rubber seal; 102. Metal gasket; 103. Opening; 11. Rubber sleeve seal test pressure hole; 12. Slip seat gasket; 13. Slip seat sealing ring; 14. Test pressure hole; 15. BT sealing ring; 16. Wellhead connecting bolt. Detailed Implementation

[0026] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Contents not described in detail in the embodiments of this utility model belong to the prior art known to those skilled in the art.

[0027] It should be noted that terms such as "upper," "lower," "inner," and "outer" are used only to facilitate the description and formation of relative orientations or positional relationships, and do not indicate or imply that the component referred to must have that specific orientation or position.

[0028] Exemplary Example 1

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 2 This is a detailed structural diagram of the conical slip assembly of this utility model, wherein, Figure 2 Figure a in the diagram is the front view, and figure b is the left view. The following section will combine... Figure 1 and Figure 2 This exemplary embodiment will be described below.

[0030] like Figure 1As shown, an integral emergency bottom flange includes an upper connecting flange 1, a slip seat 3, a tapered slip assembly 4, slip seat connecting bolts 9, a sealing rubber sleeve 10, and a rubber sleeve cover 7.

[0031] The upper connecting flange 1 and the slip seat 3 are fixedly connected by the slip seat connecting bolts 9.

[0032] The slip seat 3 is hollow, with an inverted conical hole at the upper end for installing the conical slip assembly 4, and an annular stepped hole at the lower end for installing the sealing sleeve 10.

[0033] The rubber sleeve cap 7 is connected to the slip seat 3 and is used to press and seal the rubber sleeve 10.

[0034] In this embodiment, the upper end face of the upper connecting flange 1 is connected with a wellhead connecting bolt 16, and the side is provided with a pressure test hole 14, a BT sealing ring 15 and an upper connecting flange grease injection valve 2. The BT sealing ring 15 adopts a type B double contact sealing design, which improves the sealing reliability.

[0035] In this embodiment, the upper connecting flange grease injection valve 2 is a one-way valve design and can be connected to a grease injection gun; the BT sealing ring 15 is preferably a rubber vulcanized product.

[0036] The upper connecting flange 1 is hollow, with a sealing gasket groove on the upper end face and an inverted cone inner hole, so that the diameter of the cone top hole is consistent with the inner hole diameter of the wellhead blowout preventer assembly. The lower part of the inner hole is provided with two-stage annular steps.

[0037] In this embodiment, the slip seat 3 is hollow, with an inverted conical hole at the top and an annular stepped hole at the bottom. A conical slip assembly 4 is installed in the conical hole, and a sealing rubber sleeve 10 is installed in the annular stepped hole. An O-ring rubber seal is installed on the outer circumference of the slip seat, and a rubber sleeve sealing test hole 11 is provided in the middle of the outer circumference. A slip seat grease injection valve 5 is installed in the middle of the outer circumference. The slip seat grease injection valve 5 is a one-way valve design and can be connected to a grease injection gun.

[0038] like Figure 2 As shown, the conical slip assembly 4 is made by cutting a whole circle into four pieces, and the width of the cut meets the requirements for sleeve clamping.

[0039] Exemplary Example 2

[0040] Based on exemplary embodiment 1, such as Figure 3 As shown, the sealing rubber cylinder 10 is provided with upper and lower double rubber seals 101, and a metal gasket 102 is provided in the middle. The metal gasket 102 has an opening 103 in the middle, which connects the inner diameter and outer circle of the sealing rubber cylinder 10. The sealing rubber cylinder 10 is a combined rubber vulcanized product.

[0041] In this embodiment, a slip seat gasket 12 is installed between the upper connecting flange 1 and the slip seat 3. The slip seat gasket 12 adopts a hollow two-lobed design, and the slip seat connecting bolt 9 passes through the middle hole of the slip seat gasket 12.

[0042] The rubber tube cap 7 has a hollow design, with an annular boss at the top and a conical hole at the bottom. A rubber tube cap gasket 6 is provided between the rubber tube cap 7 and the slip seat 3 to fix the relative positions of the rubber tube cap 7 and the slip seat 3, and is fixedly connected by a rubber tube cap connecting bolt 8. The rubber tube cap gasket 6 adopts a hollow two-part design, and the rubber tube cap connecting bolt 8 passes through the middle hole of the rubber tube cap gasket 6.

[0043] The integral emergency flange described in this embodiment also includes a slip seat sealing ring 13, which is embedded in the outer circle above the slip seat 3.

[0044] To better understand the above exemplary embodiments, the following is combined with Figure 1 , 3 Section 4 further illustrates the installation process of an integral emergency rescue bottom flange of this utility model, which includes:

[0045] Step 1: After an emergency occurs at the wellhead, connect the wellhead blowout preventer assembly A to the upper connecting flange 1 and secure it with the wellhead connecting bolts 16.

[0046] Step 2: The installed and fixed integrated emergency bottom flange and wellhead blowout preventer assembly are guided into the casing B through the tapered hole of the rubber sleeve cap 7, and the upper inner hole step of the upper connecting flange 1 contacts and limits the contact with the top of the casing B.

[0047] Step 3: Inject sealing grease through the upper connecting flange grease injection valve 2 to form a preliminary seal between the upper connecting flange 1 and the casing B, preventing gas flow in the well from returning from the connection between the upper connecting flange 1 and the casing B.

[0048] Step 4: Remove the slip seat gasket 12, tighten the slip seat connecting bolt 9, move the slip seat upward and squeeze the slip to clamp the outer wall of the sleeve B, and clamp the connecting flange onto the sleeve B.

[0049] Step 5: Remove the rubber tube cover gasket 6, tighten the rubber tube cover connecting bolt 8, and the rubber tube pressure block will press the sealing rubber tube tightly to make it expand and fit tightly against the outer wall of the sleeve B to achieve a two-stage main seal.

[0050] Step 6: Inject the medium into the metal gasket 102 annular groove of the sealing rubber sleeve 10 through the sealing test hole 11 to test the sealing effect.

[0051] Step 7: Shut down the blowout preventer assembly to achieve effective control of the runaway wellhead.

[0052] In this embodiment, if the test fails in step six, sealant is injected through the grease injection valve 5 of the slip seat and the test is repeated; or the sealant sleeve cap 7 is removed by loosening the sealant sleeve cap connecting bolt 8 and the sealant sleeve 10 is replaced from the bottom of the slip seat 3.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should fall within the protection scope of the present utility model's technical solution.

Claims

1. An integral emergency rescue bottom flange, characterized in that, Includes an upper connecting flange (1), a slip seat (3), a tapered slip assembly (4), slip seat connecting bolts (9), a sealing rubber sleeve (10), and a rubber sleeve gland (7); The upper connecting flange (1) and the slip seat (3) are fixedly connected by the slip seat connecting bolts (9); The slip seat (3) is hollow, with an inverted conical hole at the upper end for installing the conical slip assembly (4), and an annular stepped hole at the lower end for installing the sealing sleeve (10); The rubber tube cap (7) is connected to the slip seat (3) and is used to press and seal the rubber tube (10).

2. The integral emergency rescue bottom flange according to claim 1, characterized in that, The upper connecting flange (1) is connected to a wellhead connecting bolt (16) on its upper end face, and is provided with a test pressure hole (14), a BT sealing ring (15) and an upper connecting flange grease injection valve (2) on its side. The BT sealing ring (15) adopts a type B double contact sealing design.

3. The integral emergency rescue bottom flange according to claim 1, characterized in that, The outer circle of the slip seat (3) is provided with a rubber tube sealing test hole (11) and a slip seat grease injection valve (5) is installed. The slip seat grease injection valve (5) is a one-way valve design.

4. The integral emergency rescue bottom flange according to claim 1, characterized in that, The conical slip assembly (4) is made by cutting a whole circle into four pieces, and the width of the cut meets the requirements for sleeve clamping.

5. The integral emergency rescue bottom flange according to claim 1, characterized in that, The sealing tube (10) is provided with upper and lower double rubber seals (101) and a metal gasket (102) in the middle, and the metal gasket (102) has an opening (103) in the middle.

6. The integral emergency rescue bottom flange according to claim 1, characterized in that, A slip seat gasket (12) is installed between the upper connecting flange (1) and the slip seat (3).

7. The integral emergency rescue bottom flange according to claim 6, characterized in that, The clasp cover (12) adopts a hollow two-lobed design.

8. The integral emergency rescue bottom flange according to claim 1, characterized in that, The rubber sleeve cap (7) has a hollow design, with an annular boss at the top and a tapered hole at the bottom.

9. The integral emergency rescue bottom flange according to claim 1, characterized in that, A rubber tube cover gasket (6) is provided between the rubber tube cover (7) and the slip seat (3), and is fixedly connected by a rubber tube cover connecting bolt (8). The rubber tube cover gasket (6) adopts a hollow two-lobed design.

10. The integral emergency rescue bottom flange according to claim 1, characterized in that, It also includes a slip seat sealing ring (13), which is embedded in the outer circle above the slip seat (3).

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