Wellhead holder for blowout rescue and wellhead resetting method

Abstract

The invention provides a wellhead clamp holder for blowout emergency rescue, which comprises an emergency rescue mechanism, a clamping mechanism, a first flange, a second flange and a second flange, the emergency rescue mechanism comprises a short section, and the first flange is arranged at the downstream of the short section and is used for forming sealed connection with a wellhead; the clamping frame assembly is arranged outside the short section in a sleeving mode, the bracket is arranged between the clamping frame assembly and the emergency vehicle, the clamping arm assemblies are arranged in the clamping frame assembly and used for fixing the short section, the clamping frame assembly comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are oppositely arranged. And the supporting piece is arranged between the first clamping plate and the second clamping plate. The blowout out-of-control emergency rescue device has high clamping stability and fire resistance, so that the blowout out-of-control emergency rescue requirement can be met more easily, and more potential safety hazards can be reduced in the emergency rescue process so as to ensure the safety of rescue workers.

Description

Technical Field

[0001] The invention relates to the field of emergency rescue for uncontrolled blowouts, and in particular to a wellhead clamp used for emergency rescue for blowouts, and a method for resetting the wellhead. Background Art

[0002] At present, there are two main technologies used in the process of rescuing an uncontrolled blowout and installing a new wellhead.

[0003] First, the new wellhead is installed by crane hoisting and pressurizing with wire rope. However, since the wire rope is easily damaged or broken by shear force during the operation, it will cause serious safety hazards. In addition, due to the poor fire resistance and stability of the wire rope, there are many uncertainties for rescue workers working in the dangerous area near the wellhead.

[0004] Second, the new wellhead is installed by using the self-lifting, pressing and rotating functions of the power head of the rotary drilling rig. However, this method usually cannot be removed after the new wellhead is installed, and the rotary drilling rig must wait until the well pressure is stable before it can be reinstalled to achieve removal, which seriously affects the safety of the equipment itself. At the same time, the existence of the rotary drilling rig also brings many inconveniences to subsequent construction operations. In addition, due to the high production cost of the rotary drilling rig, if the rotary drilling rig is shelved for a long time, it is very easy to cause irreversible damage to its own parts, thereby seriously increasing the cost of production operations.

[0005] Therefore, it is desirable in the art to provide a wellhead clamp for blowout rescue to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a wellhead clamp for blowout rescue, which can remove the clamping mechanism after the emergency installation is completed, so that the blowout preventer, the ignition tube and the short joint remain at the wellhead and form a new wellhead to facilitate the subsequent aftermath work. In this way, the clamping mechanism has a good ability to be reused to improve its use value, and because the clamping mechanism can be recycled, the service life of its own parts is increased, thereby reducing the cost of production operations.

[0007] According to a first aspect of the present invention, a wellhead clamp for blowout rescue is provided, comprising a rescue mechanism, which comprises a short section, and a first flange arranged downstream of the short section and used to form a sealed connection with the wellhead,

[0008] The clamping mechanism comprises a clamping frame assembly sleeved outside the short section, and at least two clamping arm assemblies arranged in the clamping frame assembly and used to fix the short section, wherein the clamping frame assembly comprises a first clamping plate and a second clamping plate arranged opposite to each other, and a support member arranged between the first clamping plate and the second clamping plate.

[0009] In one embodiment, the first clamping plate and the second clamping plate are both configured as semi-annular structures.

[0010] In one embodiment, the support member is configured in a plate-like form, and at least two support members are provided along the circumference of the first clamping plate and the second clamping plate and are arranged at intervals.

[0011] In one embodiment, the short section is configured in the form of a hollow sleeve and is arranged concentrically with the first clamping plate and the second clamping plate, respectively.

[0012] In one embodiment, the clamping arm assembly includes a clamping cavity, a piston member extending radially outward from the clamping cavity and forming a sliding connection with the support member through a track, and a clamping plate disposed in the clamping cavity.

[0013] The piston member is configured to cause the clamping plate to move radially inward to form a sealed connection with the short section.

[0014] In one embodiment, the splint is composed of a plurality of splint segments arranged at intervals, and adjacent splint segments are connected via hinge axes.

[0015] In one embodiment, a plurality of slip teeth are arranged on the inner wall of the splint segment at intervals in the transverse and longitudinal directions, and the slip teeth are radially arranged on the splint segment.

[0016] In one embodiment, the wellhead clamp also includes a rotating mechanism, which includes slideways respectively arranged on the first clamping plate and the second clamping plate, and a pair of spaced annular portions sleeved on the outside of the short section, wherein a protrusion extending axially downward and used to form a rotational connection with the slideway is formed at the joint between the annular portion and the first clamping plate and the second clamping plate.

[0017] In one embodiment, the rescue mechanism further includes a blowout preventer disposed between the short section and the first flange, and a second flange disposed upstream of the short section, wherein the short section is fixedly connected to the ignition tube via the second flange.

[0018] According to a second aspect of the present invention, there is provided a method for resetting a wellhead using the wellhead clamp as described above, comprising the following steps:

[0019] S1, the rescue mechanism and the clamping mechanism are combined, and the short section is lowered to the wellhead,

[0020] S2, the first flange of the short section is aligned with the screw hole of the wellhead through the rotating mechanism, and the short section is fixed to the wellhead by bolts,

[0021] S3, the rescue mechanism and the clamping mechanism are disassembled, and the clamping mechanism is removed.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] First, the present invention has strong clamping stability and fire resistance, so it can more easily meet the requirements of emergency rescue of uncontrolled blowouts, and can reduce many safety hazards during the emergency rescue process to ensure the safety of rescue personnel.

[0024] Secondly, the present invention can complete the rotation and lifting adjustment of the short section under the action of the rotating mechanism and the bracket, and can effectively improve the stability of the short section during operation under the action of the clamping arm assembly to ensure that the first flange of the short section can be smoothly aligned with the screw hole on the flange of the wellhead, thereby completing the docking work at a faster speed.

[0025] Third, since the present invention has a 40-ton lifting capacity, it is easier to lift the blowout preventer, ignition tube and short joint together, and can smoothly move them to the wellhead. In addition, since the present invention has a 30-ton downward pressing capacity, it can ensure that the first flange of the short joint and the wellhead have good sealing performance, and the two can have a good sealing effect under the support of bolt fixing.

[0026] Fourthly, the present invention can remove the clamping mechanism after the rush installation is completed, so that the blowout preventer, the ignition tube and the short joint remain at the wellhead and form a new wellhead to facilitate the subsequent aftermath work. In this way, the clamping mechanism has a good ability to be reused to improve its use value, and because the clamping mechanism can be recycled, the service life of its own parts is increased, thereby reducing the cost of production operations.

[0027] In addition, since the overall structure of the clamping mechanism is relatively large, a larger construction space can be provided at the wellhead after the clamping mechanism is recovered, thereby providing a lot of convenience for subsequent construction operations.

[0028] Furthermore, the present invention has the ability to drop hands and evacuate quickly (remove the clamping mechanism), so the wellhead clamp used for blowout rescue can complete the installation work at a faster speed, thereby significantly reducing the damage caused by uncontrolled blowout. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0030] Figure 1 The structure of the wellhead clamp for blowout rescue according to the present invention is schematically shown;

[0031] Figure 2 An internal cross-sectional view of a wellhead clamp for blowout rescue according to the present invention;

[0032] Figure 3 The figure is a top view of a wellhead clamp for blowout rescue according to the present invention.

[0033] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0034] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0036] In the present invention, unless otherwise clearly stipulated and limited, terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0037] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Figure 1 The structure of a wellhead clamp 100 for blowout rescue according to the present invention is schematically shown.

[0040] Figure 2 FIG. 1 is an internal cross-sectional view of a wellhead clamp 100 for blowout rescue according to the present invention.

[0041] Figure 3 FIG. 1 is a top view of a wellhead clamp 100 for blowout rescue according to the present invention.

[0042] like Figure 1 As shown, according to the first aspect of the present invention, a wellhead clamp 100 for blowout rescue comprises a rescue mechanism, which comprises a short joint 10 , a first flange 101 and a second flange 102 .

[0043] Preferably, the short section 10 is constructed in the form of a hollow sleeve, so that after being installed on the wellhead, the flame in the well can be allowed to flow out, thereby improving the safety during the installation process.

[0044] Preferably, if Figure 1 As shown, the first flange 101 is disposed downstream of the short section 10, so as to facilitate subsequent alignment with the screw holes on the flange of the wellhead to form a sealed connection relationship with the wellhead, thereby improving safety during the rush installation process.

[0045] In one embodiment, a blowout preventer (not shown in the drawings) is further provided between the short joint 10 and the first flange 101, so as to improve the success rate of wellhead rescue. It is easy to understand that the blowout preventer is used to close the wellhead during operations such as oil testing, well repair, and well completion to prevent blowout accidents. It combines the functions of full sealing and semi-sealing into one, has the characteristics of simple structure, easy operation, high pressure resistance, etc., and is a safety sealing wellhead device commonly used in oil fields to prevent blowouts.

[0046] Preferably, the second flange 102 is disposed upstream of the short section 10, and the short section 10 can be fixedly connected with the ignition tube (not shown in the drawings) through the second flange 102. Thus, the flame generated in the well can be smoothly discharged through the ignition tube, thereby reducing the potential safety hazard in the well and improving the safety of the wellhead.

[0047] According to the present invention, the wellhead clamp 100 for blowout rescue also includes a clamping mechanism. Figure 1 As shown, the clamping mechanism includes a clamping frame assembly 20 and a clamping arm assembly 30. The clamping arm assembly 30 is arranged in the clamping frame assembly 20 through a track 301, and the clamping frame assembly 20 is sleeved outside the short section 10, and the clamping frame assembly 20 can effectively fix and limit the short section 10 through the clamping arm assembly 30, thereby ensuring that the short section 10 can rotate together with the clamping arm assembly 30, so as to improve the overall flexibility of the wellhead clamp 100 used for blowout rescue.

[0048] In one embodiment, Figure 1As shown, the clamping frame assembly 20 includes a first clamping plate 21, a second clamping plate 22 and a support member 33. Preferably, the first clamping plate 21 and the second clamping plate 22 have the same structure and are arranged opposite to each other. The support member 33 is arranged between the first clamping plate 21 and the second clamping plate 22, so as to effectively support the first clamping plate 21 and the second clamping plate 22 respectively.

[0049] In a preferred embodiment, the first clamping plate 21 and the second clamping plate 22 are both configured as a semi-annular structure. In this way, the short section 10 can be more easily inserted into the clamping frame assembly 20 and respectively form a rotational connection with the first clamping plate 21 and the second clamping plate 22, the contents of which are described below.

[0050] In addition, since the short section 10 is configured as a hollow sleeve, and the first clamping plate 21 and the second clamping plate 22 are configured as a semi-annular structure, the two can have a better effect during the installation and removal process, thereby improving the rescue speed of the wellhead clamp 100 used for blowout rescue.

[0051] According to the present invention, the wellhead clamp 100 for blowout rescue further comprises a rotating mechanism, which comprises slideways respectively arranged on the first clamping plate 21 and the second clamping plate 22 , and a pair of spaced annular portions sleeved outside the short joint 10 .

[0052] According to a specific embodiment of the present invention, Figure 1 As shown, the slideway includes a first slideway 41 provided on the first clamping plate 21 and a second slideway 42 provided on the second clamping plate 22. Preferably, the first slideway 41 and the second slideway 42 are both configured as semicircular structures, thereby facilitating the short section 10 to slide smoothly on the first clamping plate 21 and the second clamping plate 22.

[0053] According to a specific embodiment of the present invention, Figure 1 As shown, the annular portion includes a first annular portion 43 and a second annular portion 44. Preferably, the first annular portion 43 is located above the second annular portion 44, and the two are arranged at intervals so as to correspond one-to-one with the first slideway 41 and the second slideway 42.

[0054] Preferably, when the short section 10 is installed in the clamping frame assembly 20 , the first annular portion 43 of the short section 10 matches the first slideway 41 on the first clamping plate 21 , and the second annular portion 44 of the short section 10 matches the second slideway 42 on the second clamping plate 22 .

[0055] In one embodiment, Figure 1As shown, a protrusion 45 extending axially downward and used to form a rotational connection with the slideway is formed at the joint between the annular portion and the first clamping plate 21 and the second clamping plate 22. In other words, the protrusion 45 is provided on the first annular portion 43 and the second annular portion 44, so that the first annular portion 43 and the first slideway 41 and the second annular portion 44 and the second slideway 42 can have an effective sliding connection relationship through the protrusion 45.

[0056] It is easy to understand that the protrusions 45 on the first annular portion 43 and the second annular portion 44 ensure that the short section 10 can be rotated at a small angle on the first clamping plate 21 and the second clamping plate 22, thereby improving the stability of the rescue mechanism during the emergency installation process, thereby shortening the installation time and further improving the success rate of the emergency installation.

[0057] In a specific embodiment, the short section 10 has a rotation range of 1° to 12° on the first clamping plate 21 and the second clamping plate 22 (the content of which is introduced below), so that the first flange 101 located downstream of the short section 10 can be accurately fine-tuned to ensure that the first flange 101 can be smoothly aligned with the screw holes (not shown) on the flange of the wellhead.

[0058] In one embodiment, the support member 23 is configured in a plate-like form. Preferably, the support member 23 is configured in an arc-shaped plate. Therefore, the track 301 can be more easily arranged on the support member 23, so that the clamping arm assembly 30 can be more easily rotated on the support member 23 through the track 301, and further drive the short section 10 to rotate in the clamping frame assembly 20, so as to ensure that the first flange 101 can be smoothly aligned with the screw hole on the flange of the wellhead, thereby improving the firmness between the short section 10 and the wellhead.

[0059] In a specific embodiment, at least two spaced support members 23 are provided along the circumference of the first clamping plate 21 and the second clamping plate 22. In this way, on the one hand, the overall mass of the wellhead clamp 100 for blowout rescue can be effectively reduced, thereby improving flexibility and operability. On the other hand, the overall stability of the clamping frame assembly 20 can be effectively improved to ensure that the wellhead clamp 100 for blowout rescue can be installed smoothly, thereby quickly reducing the safety hazards caused by the blowout.

[0060] According to a specific embodiment of the present invention, the short section 10 is constructed in the form of a hollow sleeve and is arranged concentrically with the first clamping plate 21 and the second clamping plate 22, respectively. In this way, the short section 10 can always rotate along the same center under the action of the slideways (first slideway 41 and second slideway 42) on the first clamping plate 21 and the second clamping plate 22, so as to ensure that the first flange 101 can be smoothly aligned with the screw holes on the flange of the wellhead, so as to improve the firmness between the short section 10 and the wellhead. In addition, the concentric arrangement can ensure that the new wellhead (short section 10) is easier to align with the wellhead, and the screw holes on the first flange 101 are easier to align with the screw holes on the flange of the wellhead after rotation. Since the first flange 101 and the second flange 102 can only perform concentric circular motion, it can be ensured that the short section 10 does not produce radial displacement during the rotation process, thereby greatly shortening the alignment time between the screw holes.

[0061] In addition, the protrusions 45 on the first annular portion 43 and the second annular portion 44 ensure that the short section 10 can always be in the first slideway 41 on the first clamping plate 21 and the second slideway 42 on the second clamping plate 22, thereby effectively avoiding the derailment of the short section 10 during the installation process, thereby effectively improving the installation success rate of the wellhead clamp 100 for blowout rescue and shortening the installation time of the wellhead clamp 100 for blowout rescue.

[0062] In one embodiment, at least two clamping arm assemblies 30 are provided, and each clamping arm assemblies 30 are fixedly connected to each other to form an integral structure, thereby enabling the plurality of clamping arm assemblies 30 to rotate simultaneously in the same direction.

[0063] In one embodiment, Figure 3 As shown, the clamping arm assembly 30 includes a clamping cavity 31 and a clamping plate. The clamping plate is arranged in the clamping cavity 31, and the clamping plate can form a sealed connection with the outer wall surface of the short section 10 under the action of a piston member 32 (described below).

[0064] In one embodiment, Figure 3 As shown, the clamping arm assembly 30 further includes a piston member 32. The piston member 32 is radially extended outward from the clamping cavity 31, and the piston member 32 is slidably connected to the support member 23 through a track 301. Preferably, the track 301 is radially arranged on the support member 23, thereby allowing the piston member 32 to rotate on the support member 23 to achieve fine adjustment of the angle of the short section 10.

[0065] Preferably, the piston member 32 has a rotation range of 1° to 12° on the support member 23. Since the short section 10 can rotate at a small angle on the first clamping plate 21 and the second clamping plate 22 through the track 301, the stability of the rescue mechanism during the emergency installation process is improved, thereby shortening the installation time and further improving the success rate of the emergency installation.

[0066] According to a specific embodiment of the present invention, the piston member 32 is configured to cause the clamp to move radially inward, so that the clamp is radially abutted against the short section 10, to ensure that a sealed connection can be formed between the clamp and the short section 10, and further to ensure that the short section 10 can smoothly follow the clamping arm assembly 30 to rotate at a micro-angle, so as to ensure that the first flange 101 can be smoothly aligned with the screw hole on the flange of the wellhead.

[0067] In a specific embodiment, Figure 3 As shown, the piston member 32 further includes a cylinder 321 and a piston 322. The cylinder 321 is disposed at one end of the clamping chamber 31 away from the short section 10, and the first end of the piston 322 is in the cylinder 321, and the second end of the piston 322 is used to push the clamping plate and make the clamping plate firmly hold the short section 10.

[0068] In one embodiment, Figure 3 As shown, the clamping plate is composed of a plurality of clamping plate segments 33 arranged at intervals, and adjacent clamping plate segments 33 are connected by hinge shafts 34. In this way, the clamping plate segments 33 can more easily hold the outer wall of the short section 10 under the action of the piston member 32, and the clamping plate can have good flexibility during the holding process.

[0069] In one embodiment, a plurality of slip teeth (not shown) arranged at intervals in the transverse and longitudinal directions are provided on the inner wall of the clamping plate segment 33, and the slip teeth are radially arranged on the clamping plate segment 33. Therefore, when the clamping arm assembly 30 holds the outer wall of the short sub 10, the clamping plate segment 33 can have a greater friction force with the short sub 10 through the slip teeth, thereby improving the clamping force of the clamping arm assembly 30 on the short sub 10, and then when the first flange 101 is aligned with the screw hole on the flange of the wellhead, the short sub 10 can be fine-tuned in a stable posture, thereby completing the docking work at a faster speed.

[0070] In one embodiment, Figure 2 As shown, the clamping mechanism further includes a bracket 50. Preferably, the bracket 50 is disposed between the clamping frame assembly 20 and the rescue vehicle, thereby ensuring that the short section 10 can achieve a lifting effect.

[0071] In a preferred embodiment, the wellhead clamp 100 used for blowout rescue has the capability of lifting 40 tons and pressing down 30 tons.

[0072] It is easy to understand that the present invention can be used in conjunction with a rescue vehicle (not shown), wherein the rescue vehicle includes a mast (not shown) arranged in the longitudinal direction. Preferably, the bracket 50 in the wellhead clamp 100 for blowout rescue can be sleeved outside the mast. Thus, the bracket 50 slides on the mast in an orderly manner, thereby driving the overall structure of the wellhead clamp 100 for blowout rescue to achieve the purpose of lifting and lowering, so as to improve the flexibility of the wellhead clamp 100 for blowout rescue to adjust the short section 10.

[0073] According to a second aspect of the present invention, there is provided a method for resetting a wellhead using the rescue vehicle as described above, comprising the following steps:

[0074] The first step: the rescue mechanism and the clamping mechanism are combined, and the short section 10 is lowered to the wellhead.

[0075] First, the first flange 101 and the second flange 102 are respectively installed at both ends of the short section 10, and the assembled short section 10 is inserted into the clamping frame assembly 20 (the first annular portion 43 and the second annular portion 44 on the short section 10 are sealedly connected with the first slideway 41 on the first clamping plate 21 and the second slideway 42 on the second clamping plate 22 through the protrusion 45);

[0076] Then, the blowout preventer and the ignition tube are installed on the short section 10 respectively.

[0077] Afterwards, the piston 322 pushes the clamping plate segment 33 under the action of the oil cylinder 321 to realize the clamping function of the short section 10, and is raised and lowered on the mast through the bracket 50 to ensure that the short section 10 can be smoothly lowered to the wellhead.

[0078] Step 2: The first flange 101 of the short section 10 is aligned with the screw hole of the wellhead through the rotating mechanism, and the short section 10 is fixed to the wellhead through bolts (not shown).

[0079] Specifically, the first flange 101 on the short section 10 is adjusted at a slight angle in the clamping frame assembly 20 along with the clamping arm assembly 30, so that the screw holes on the first flange 101 are aligned with the screw holes of the flange at the wellhead, and the construction personnel rush to install it to ensure that the short section 10 is firmly fixed to the wellhead.

[0080] Step 3: Disassemble the rescue mechanism and the clamping mechanism, and remove the clamping mechanism.

[0081] Specifically, the clamping frame assembly 20 is separated from the short section 10, thereby leaving the blowout preventer, the ignition tube and the short section 10 at the wellhead to form a new wellhead, thereby achieving the purpose of emergency rescue and installation of uncontrolled blowout. The clamping mechanism is removed from the wellhead clamp 100 used for blowout rescue and recovered, thereby providing sufficient construction space for subsequent work such as well killing.

[0082] Compared with the prior art, the present invention has the following advantages.

[0083] First, the present invention has strong clamping stability and fire resistance, so it can more easily meet the requirements of emergency rescue of uncontrolled blowouts, and can reduce many safety hazards during the emergency rescue process to ensure the safety of rescue personnel.

[0084] Secondly, the present invention can complete the rotation and lifting adjustment of the short section 10 under the action of the rotating mechanism and the bracket 50, and can effectively improve the stability of the short section 10 during operation under the action of the clamping arm assembly 30, so as to ensure that the first flange 101 of the short section 10 can be smoothly aligned with the screw hole on the flange of the wellhead, thereby completing the docking work at a faster speed.

[0085] Third, since the present invention has a 40-ton lifting capacity, it is easier to lift the blowout preventer, the ignition tube and the short section 10 together, and can smoothly move them to the wellhead. In addition, since the present invention has a 30-ton downward pressing capacity, it can ensure that the first flange 101 of the short section 10 and the wellhead have good sealing performance, and the two can have a good sealing effect under the support of bolt fixing.

[0086] Fourthly, the present invention can remove the clamping mechanism after the rush installation is completed, so that the blowout preventer, the ignition tube and the short joint 10 remain at the wellhead and form a new wellhead to facilitate the subsequent aftermath work. In this way, the clamping mechanism has a good ability to be reused to improve its use value, and because the clamping mechanism can be recycled, the service life of its own parts is increased, thereby reducing the cost of production operations.

[0087] In addition, since the overall structure of the clamping mechanism is relatively large, a larger construction space can be provided at the wellhead after the clamping mechanism is recovered, thereby providing a lot of convenience for subsequent construction operations.

[0088] Furthermore, the present invention has the ability to drop and quickly evacuate (remove the clamping mechanism), so the wellhead clamp 100 used for blowout rescue can complete the installation work at a faster speed, thereby significantly reducing the damage caused by uncontrolled blowout.

[0089] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the disclosure scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A wellhead clamp for blowout rescue, comprising: The rescue mechanism comprises a short section (10) and a first flange (101) arranged downstream of the short section (10) and used to form a sealed connection with a wellhead. A clamping mechanism comprises a clamping frame assembly (20) sleeved outside the short section (10), and at least two clamping arm assemblies (30) arranged in the clamping frame assembly (20) and used to fix the short section (10), wherein the clamping frame assembly (20) comprises a first clamping plate (21) and a second clamping plate (22) arranged opposite to each other, and a support member (23) arranged between the first clamping plate (21) and the second clamping plate (22).

2. The wellhead clamp for blowout rescue according to claim 1, characterized in that: The first clamping plate (21) and the second clamping plate (22) are both configured as semi-annular structures.

3. The wellhead clamp for blowout rescue according to claim 2, characterized in that: The support member (23) is constructed in a plate-like form, and at least two support members (23) are arranged at intervals along the circumference of the first clamping plate (21) and the second clamping plate (22).

4. The wellhead clamp for blowout rescue according to claim 3 is characterized in that: The short section (10) is constructed in the form of a hollow sleeve and is arranged concentrically with the first clamping plate (21) and the second clamping plate (22), respectively.

5. The wellhead clamp for blowout rescue according to claim 4, characterized in that: The clamping arm assembly (30) comprises a clamping cavity (31), a piston member (32) extending radially outward from the clamping cavity (31) and forming a sliding connection with the support member (23) through a track (301), and a clamping plate arranged in the clamping cavity (31). The piston member (32) is configured to cause the clamping plate to move radially inward to form a sealed connection with the short section (10).

6. The wellhead clamp for blowout rescue according to claim 5, characterized in that: The splint is composed of a plurality of splint segments (33) arranged at intervals, and adjacent splint segments (33) are connected via hinge axes (34).

7. The wellhead clamp for blowout rescue according to claim 6, characterized in that: A plurality of slip teeth are arranged at intervals in the transverse and longitudinal directions on the inner wall of the splint segment (33), and the slip teeth are radially arranged on the splint segment (33).

8. The wellhead clamp for blowout rescue according to claim 7, characterized in that: The wellhead clamp also includes a rotating mechanism, which includes slideways respectively arranged on the first clamping plate (21) and the second clamping plate (22), and a pair of spaced annular portions sleeved on the outside of the short section (10), wherein a protrusion (45) extending axially downward and used to form a rotational connection with the slideway is formed at the junction between the annular portion and the first clamping plate (21) and the second clamping plate (22).

9. The wellhead clamp for blowout rescue according to claim 8, characterized in that: The rescue mechanism further comprises a blowout preventer arranged between the short section (10) and the first flange (101), and a second flange (102) arranged upstream of the short section (10), wherein the short section (10) is fixedly connected to the ignition tube via the second flange (102).

10. A method for resetting a wellhead using the wellhead holder according to any one of claims 1 to 9, comprising the following steps: S1, the rescue mechanism and the clamping mechanism are combined, and the short section (10) is lowered to the wellhead, S2, the first flange (101) of the short section (10) is aligned with the screw hole of the wellhead through the rotating mechanism, and the short section (10) is fixed to the wellhead by bolts, S3, the rescue mechanism and the clamping mechanism are disassembled, and the clamping mechanism is removed.

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