Gap control for cable shear rams

Abstract

The present disclosure provides a shear gate system including an upper block coupled to a first arm, the upper block positioned to translate from a first position outside a bore to a second position inside the bore, the upper block including an upper blade having a cutout formed at a radially outward end, the cutout having a cutout profile. The shear gate system also includes a lower block coupled to a second arm, the lower block positioned to translate from a first position outside the bore to a second position inside the bore, the lower block including a gap control arm including a wear insert arranged axially higher than a lower blade, the gap control arm having an arm profile substantially coinciding with the cutout profile. The wear insert of the gap control arm is configured to engage the cutout when the upper block and the lower block are moved to the second position.

Description

Background Technology 1. Technical Field

[0002] This disclosure relates in general to oil and gas tools, and more particularly to systems and methods for cutting tubular bodies and / or cables.

[0003] 2. Description of related technologies

[0004] In oil and gas production, drilling and production can occur in high-pressure environments, where various tools can be used to control wellbore pressure. For example, blowout preventers (BOPs) can be placed at the wellbore inlet. During operation, equipment can pass through the BOP, and if necessary, the BOP can be used to seal the wellbore to reduce the possibility of uncontrolled release from the wellbore. One component of the BOP can be a shear ram. The shear ram can be a hydraulically driven component that drives the cutting edges of two components toward each other to contact and shear components between them, such as cables or pipes. However, shear rams can be subjected to excessive stress during operation and therefore can wear out rapidly. Furthermore, while maintaining the shearing capacity for cables, it may be difficult to effectively shear large-diameter pipes. Summary of the Invention

[0005] The applicant recognizes the problems mentioned above and has conceived and developed implementation schemes for systems and methods for shear gates according to this disclosure.

[0006] In one embodiment, the shear gate system includes an upper block coupled to a first arm, positioned to translate from a first position outside the bore to a second position inside the bore. The upper block includes an upper blade having a notch formed at a radially outward end, the notch having a notch profile. The shear gate system also includes a lower block coupled to a second arm, positioned to translate from the first position outside the bore to the second position inside the bore. The lower block includes a clearance control arm including a wear insert arranged axially above the lower blade, the clearance control arm having an arm profile substantially conforming to the notch profile. The wear insert of the clearance control arm is configured to engage the notch when the upper and lower blocks are moved to the second position.

[0007] In another embodiment, the wellhead includes a tubular body fluidly connected to the wellbore, the tubular body having a bore; and a pressure control device positioned to extend into the bore. The pressure control device includes a lower support arranged in a first position near the bore and a second position within the bore, the lower support including a clearance control arm arranged axially above a mounting base and including a recess configured to receive a removable wear insert. The pressure control device also includes a lower blade coupled to the lower support. The pressure control device also includes an upper support arranged in a first position near the bore and a second position within the bore. The pressure control device also includes an upper blade coupled to the upper support, the upper blade including a notch formed at a radially outward position relative to the cutting face of the upper blade, the notch having a notch profile configured to receive the clearance control arm when the lower and upper supports are in the second position.

[0008] In one embodiment, the blowout preventer includes a bore fluidly connected to the wellbore and a pressure control device positioned to extend into the bore. The pressure control device includes an upper block coupled to a first arm, positioned to translate from a first position outside the bore to a second position inside the bore. The upper block includes an upper blade having a notch formed at a radially outward end, the notch having a notch profile. The pressure control device also includes a lower block coupled to a second arm, positioned to translate from the first position outside the bore to the second position inside the bore. The lower block includes a clearance control arm including a wear insert arranged axially above the lower blade, the clearance control arm having an arm profile substantially conforming to the notch profile. The wear insert of the clearance control arm is configured to engage the notch when the upper and lower blocks are moved to the second position. Attached Figure Description

[0009] This technology will be better understood by reading the following detailed description of non-limiting embodiments and by viewing the accompanying drawings, wherein:

[0010] Figure 1 This is a side front view of one embodiment of a wellbore system according to the present disclosure;

[0011] Figure 2 This is a schematic perspective view of one embodiment of a shear gate system according to the present disclosure;

[0012] Figure 3 This is a side front view of one embodiment of a shear gate system according to the present disclosure;

[0013] Figure 4 This is a perspective view of one embodiment of a shear gate system according to the present disclosure;

[0014] Figure 5 This is a partial perspective view of one embodiment of a clearance control arm with a wear insert according to an embodiment of the present disclosure;

[0015] Figure 6 This is a perspective view of one embodiment of a wear insert according to the embodiments of this disclosure;

[0016] Figure 7 This is a perspective view of one embodiment of a cut formed in the upper blade according to an embodiment of the present disclosure;

[0017] Figure 8 This is a side view of one embodiment of a clearance control arm with a wear insert according to an embodiment of the present disclosure;

[0018] Figure 9 This is a front view of one embodiment of the lower block of the embodiments according to this disclosure;

[0019] Figure 10 This is a side view of one embodiment of a cut formed in the upper blade according to an embodiment of the present disclosure;

[0020] Figure 11 This is a front view of one embodiment of the upper block of the embodiments according to this disclosure;

[0021] Figure 12 This is a line diagram of an embodiment of the operating conditions of the upper and lower blocks according to the embodiments of this disclosure; and

[0022] Figure 13 It is a line diagram of an implementation of the operating conditions of the upper and lower blocks according to the implementation of this disclosure. Detailed Implementation

[0023] The foregoing aspects, features, and advantages of this technology will be further understood when considered with reference to the following description and accompanying drawings of preferred embodiments, wherein similar reference numerals denote similar elements. In describing preferred embodiments of the technology shown in the drawings, specific terminology will be used for clarity. However, this technology is not intended to be limited to the specific terminology used, and it should be understood that each specific term includes equivalents that operate in a similar manner to achieve similar purposes.

[0024] When describing elements of various embodiments of the invention, the articles “a,” “an,” “the,” and “the” are intended to mean the presence of one or more elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that additional elements may be present in addition to those listed. Any examples of operating parameters and / or environmental conditions do not exclude other parameters / conditions of the disclosed embodiments. Furthermore, it should be understood that references to “one embodiment,” “implementation,” “certain embodiments,” or “other embodiments” of the invention are not intended to be construed as excluding the existence of additional embodiments that also include the referenced features. Additionally, references to terms relating to orientation, such as “above,” “below,” “upper,” “lower,” “side,” “front,” “rear,” or other terms, are made with reference to the illustrated embodiments and are not intended to limit or exclude other orientations. Furthermore, for simplicity, similar numerals may be used for similar parts, but such numbering is not intended to limit this disclosure. Moreover, it should be understood that various features of one or more embodiments shown herein may be utilized in other embodiments.

[0025] This disclosure relates to blowout preventer (BOP) shear gate systems that can be used for both piping (e.g., tubular structures, housings, pipes, etc.) and cables. Various embodiments present clearance control arms, wear inserts, shear blade geometries, and shear gate geometries that enable the shear gate of the shear gate system to cut both pipes and cables. As will be discussed herein, the clearance control arm may be mounted on a lower support together with the wear insert, which engages with a removable blade attached to an upper support. However, it should be understood that various embodiments may mount the clearance control arm and insert on the upper support to engage a removable blade attached to the lower support. Embodiments of this disclosure provide a robust system that enables improved maintenance operations through the provision of removable replacement parts at the friction interface. Furthermore, various embodiments enable the cutting of large-diameter pipes while maintaining the ability to cut cables.

[0026] Various embodiments of this disclosure provide clearance control profiles directly integrated into detachable, separable components (e.g., blades) to enable clearance control between the block and the blade. Furthermore, various embodiments may include the use of two attachable and / or replaceable components to provide a clearance control interface. For example, in various embodiments, a wear insert and a blade may form an interface. Advantageously, this configuration allows for replacement of both interface components after field use to re-establish clearance control. Embodiments also provide blades capable of spanning the entire bore to capture cables located at any position within the bore, thereby enabling successful cable cutting. This is achievable even without a stabilizer for capturing cables located outside the blade span; however, it should be understood that embodiments of this disclosure may also incorporate cables.

[0027] As will be described below, in various embodiments, the profile of the clearance control arm can substantially correspond to the cut formed in the blade opposite the clearance control arm. Therefore, an interface connection can be made between the respective profiles, which may include replaceable parts at the primary friction interface, thereby improving maintenance operations and potentially increasing the overall service life of the system. In various embodiments, the system is capable of cutting the pipe across the full bore span, such that the cutting surface of the blade is substantially positioned within the clearance control arm and the cut. Additionally, various embodiments include a stepped geometry of the cut that allows for a tight fit, bringing the opposing blades together while maintaining the cutting interface between replaceable parts.

[0028] Figure 1 This is a schematic side view of an embodiment of a wellbore system 100, which includes a tool 102 (which may be part of a tool string) descending from a surface location 108 into a wellbore 104 formed in the formation 106. The wellbore system 100 shown may be referred to as a cable system because the tool 102 is transported via a cable 110 (such as an electrical cable). It should be understood that a cable system is shown for illustrative purposes, and the embodiments of this disclosure can also be used in other applications where the tubular structure extends into the wellbore 104. In various embodiments, the electrical cable may transmit electrical signals and / or energy from the surface location 108 into the wellbore, for example, to provide operating power to the tool 102 and / or to transmit data, such as data obtained from sensors arranged on the tool 102. In various embodiments, the tool 102 may be used to perform downhole logging operations, such as imaging tools, resistivity tools, nuclear tools, or any other logging tools that may be used in the downhole environment.

[0029] Wellbore system 100 includes a wellhead assembly 112 shown at the opening of wellbore 104 to provide pressure control of wellbore 104 and allow equipment (such as cable 110 and tool 102) into wellbore 104. In this example, cable 110 is a cable wound from service vehicle 114. Wellhead assembly 112 may include a blowout preventer (BOP) 116 (e.g., a pressure control device) including a shear gate for cutting components extending through BOP 116. As described below, in various embodiments, the shear gate may be energized to move from a position outside the bore of BOP 116 to a position inside the bore of BOP 116. In the illustrated embodiment, the shear gate may cut cable 110, thereby facilitating the closure of wellbore 104. Furthermore, it should be understood that the shear gate may also cut drill pipe, casing, shear substitutes or tubes, control lines, tubing, hoses and / or combinations of cables. Therefore, mentioning only the cutting of one of the pipes or cables is not intended to limit the scope of this disclosure, as it should be understood that embodiments may utilize the features described herein to achieve the cutting of multiple different components. Although Figure 1 While illustrated as surface operations, it should also be understood that various embodiments of this disclosure can be incorporated into other applications, such as seabed or marine applications. For example, embodiments can be incorporated into a BOP group positioned on the seabed.

[0030] Figure 2 This is a schematic isometric view of an embodiment of a shear gate system 200 (e.g., a pressure control device) that may be incorporated into or associated with a BOP (e.g., BOP 116). In the illustrated embodiment, the shear gate system 200 includes a pair of shear gates 202, 204. Shear gates 202, 204 may be referred to as the upper block and lower block, respectively. Shear gates 202, 204 are each coupled to arms 206, 208, which facilitates radial movement of gates 202, 204 in a first direction 210 and a second direction 212. In operation, the gates may be arranged outside a bore 214 of a wellbore tubular body 216, which may be part of the BOP, and may extend into the bore 214 when activated. In the illustrated embodiment, a cable 110 (which may be a wire) is arranged within the bore 214. It should be understood that cable 110 may be positioned within another tubular body (such as a housing) that also extends through bore 214. As will be described below, embodiments of this disclosure may facilitate the cutting of cable 110 and other tubular bodies positioned within bore 214.

[0031] Figure 3This is a schematic side view of an embodiment of a shear gate system 300, which, as described above, can be included within a BOP or other pressure control device associated with the wellbore. The illustrated shear gate system 300 is positioned to extend at least partially into the bore 214 and includes an upper block 302 and a lower block 304, which may also be referred to as a gate. In the illustrated embodiment, the upper block 302 and lower block 304 are gates. As those skilled in the art will understand, a shear gate is operable to shear and / or cut components within the wellbore. While the embodiments described herein may relate to a shear gate, it should be understood that other gates, such as pipe gates or double-biased gates, may also be utilized.

[0032] In various embodiments, the upper block 302 and the lower block 304 may each be formed of one or more components joined together. By way of example, an upper support 306 (e.g., an upper block support) and a lower support 308 (e.g., a lower block support) may respectively receive an upper blade 310 and a lower blade 312. In various embodiments, blades 310, 312 are coupled to supports 306, 308 via fasteners or the like, and therefore may be removable components that can be separated and replaced after one or more operating cycles. For example, blades 310, 312 may be dull, and therefore may need to be replaced. While the illustrated configuration includes removable components, it should be understood that other embodiments may include an integral support and blade without fasteners. Furthermore, in embodiments, one gate may include a removable component, while the other gate is an integral gate.

[0033] In the illustrated embodiment, the lower support 308 includes a clearance control arm 314 on each side. The clearance control arm 314 may be formed within the body portion of the lower support 308, for example, by performing one or more machining processes at selected locations. In this example, the clearance control arm is arranged radially outward from the lower blade 312; however, it should be understood that at least a portion of the clearance control arm 314 may overlap with at least a portion of the lower blade 312. However, in other embodiments, there may be no overlap between the clearance control arm 314 and the lower blade 314. As will be described, a wear insert 316 may be detachably coupled to each clearance control arm 314, for example, via fasteners. The wear insert 316 may be used with mating cutting surfaces to facilitate cutting both tubular objects and cables. It should be understood that in various embodiments, the wear insert 316 may also be integrally formed into the clearance control arm 314, thereby forming a single replaceable part. That is, the wear insert 316 may be part of the clearance control arm 314, which includes different metals, surface treatments, etc. that are integrally formed with and replaceable with the clearance control arm 314. For example, the wear insert 316 may be press-fitted to the clearance control arm 314.

[0034] In various embodiments, the upper blade 310 includes a notch 318, which is represented by a contour that will be described in more detail herein. The notch 318 may be substantially aligned with a wear insert 316 (e.g., with a clearance control arm 314) such that, in operation, the wear insert 316 contacts and engages the notch 318. This configuration allows the blades to remain together and / or close enough to cut cables, while also enabling the cutting of tubular structures within the bore 214.

[0035] Figure 4 This is a perspective view of a shear gate system 300, showing an upper block 302 and a lower block 304, including supports 306, 308 and blades 310, 312. As described, blades 310, 312 are each attached to the corresponding supports 306, 308 via one or more connectors (such as fasteners 400). However, it should be understood that various other coupling mechanisms can be used to attach blades 310, 312 to supports 306, 308. Furthermore, as described, in various embodiments, blades 310, 312 may be integrally formed into supports 306, 308. In various embodiments, it may be necessary to make blades 310, 312 removable to allow for repair and / or replacement during maintenance operations. The removability of blades 310, 312 can provide specific advantages, such as quick replacement in the field, as described herein. Furthermore, unique tolerance conditions can be achieved, for example, by including blades of different sizes. In addition, various implementation schemes can incorporate blades with different cutting profiles, and the detachability will allow for easy and quick replacement and adjustment of the cutting profile in the field.

[0036] The lower support 308 shown includes a clearance control arm 314 arranged axially higher than the lower cutting tool 312. That is, relative to the boring hole 214 ( Figure 3 In the illustrated embodiment, the gap control arm 314 is positioned higher than the lower blade 312. The gap control arm 314 is integrally formed with the body 402 of the lower support 308, and a gap 404 spaces the gap control arm 314 from the mounting base 406. As will be described below, the gap 404 receives at least a portion of the upper blade 310, which facilitates BOP operation. The mounting base 406 includes a vertical mounting surface 408 (e.g., a mounting interface) that receives and supports the lower blade 312. As described above, vertical is used to describe... Figure 4 The terminology is relative to the current orientation, and it should be understood that in various embodiments, the mounting surface 408 may include one or more bevels or ridges to facilitate securing the lower blade 312 to the lower support 308.

[0037] The clearance control arm 314 shown extends inward toward the support axis 410 such that the inner arm surface 412 is closer to the support axis 410 than the outer arm surface 414, which may form at least a portion of the outer diameter of the lower support 308. The arm thickness 416 is shown extending between the inner arm surface 412 and the inner surface 418 of the lower support. It should be understood that the arm thickness 416 can be specifically selected based on one or more operating conditions of the system. For example, certain conditions (such as high pressure or a thicker tubular body) may result in a thicker arm, while other conditions may favor a thinner arm.

[0038] In the illustrated embodiment, the clearance control arm 314 extends from the lower support surface 420 for a clearance control arm length 426 to the lower support wall 422, which forms at least a portion of a clearance hole 424 for receiving at least a portion of the upper blade 310 and / or the upper support 306. In this example, the inner arm surface 412 is substantially planar and constant along the clearance control arm length 426; however, it should be understood that in other embodiments, the inner arm surface 412 may vary along the length 426. By way of example, the inner arm surface 412 may include a ramp or step with a local thickness 416 that may be increased or decreased. It should be understood that these features may be specifically selected based on the intended operating conditions. Additionally, the inner arm surface 412 may not be substantially vertical, but may be inclined inward toward the axis 310, may be curved or arcuate, or any other reasonable shape.

[0039] The clearance control arm 314 also includes a recess 428 for receiving a wear insert 316, which in this example is secured to the clearance control arm 314 via an insert fastener 430. In various embodiments, the wear insert 316 may be considered a loose-fit or clearance-fit component, wherein the insert fastener 430 allows the wear insert 316 to make minute movements within the recess 428. As used herein, minute can refer to movements within tolerances, such as about 5% to 10% of the recess length and / or about 10% to 20% of the diameter of the fastener 430, and other potential ranges. As will be described below, the mating surface of the wear insert 316 may move axially along axis 410 in response to an external force, wherein the insert fastener 430 enables such movement while maintaining the position of the wear insert 316 within the recess 428. That is, a contact force may drive the wear insert 316 axially upward (e.g., away from the mounting base 406).

[0040] The clearance control arm 314 includes an arm profile 432, which may be specifically selected to correspond to and interface with a cut 318 (e.g., a clearance control cut) formed on the upper blade 310. In this example, the upper blade 310 includes cuts 318 at a radially outward portion 434 of the upper blade 310, each cut 318 being aligned with a corresponding clearance control arm 314 of the lower support 308. Thus, in operation, as the upper blade 310 and the lower blade 312 move toward each other, the upper blade 310 will interface with the lower support 308. Specifically, the cuts 318 will interface with the wear insert 316 and / or the clearance control arm 314.

[0041] In this example, cut 318 includes a cut profile 436 that substantially conforms to the arm profile 432, and in this example includes a cut wall 438 and a cut surface 440. The cut wall 438 shown is substantially vertical and arranged substantially perpendicular to the cut surface 440; however, it should be understood that this configuration is for illustrative purposes only, and in various embodiments, the wall 438 and / or surface 440 may be inclined or have a variable profile to interface with the arm profile 432. Cut 318 spans a cut length 442, extending from the upper support mounting surface 444 to the end 446 of the upper blade 310. It should be understood that cut 318 and its various dimensions may be specifically selected based on the anticipated operating conditions, as also described with respect to the characteristics of the clearance control arm 314.

[0042] As described above, various embodiments include inserts 310, 312 for capturing the entire boring hole. To facilitate the operation of inserts 310, 312, a guide cone 448 may be included. As shown, the guide cone 448 is inclined inward toward axis 410 and can be used to capture the cable within the boring hole.

[0043] Figure 5 This is a perspective view of one embodiment of the lower support 308 and the lower blade 312. The view also shows a clearance control arm 314 including a wear insert 316 disposed within a recess 428. As described above, in various embodiments, the wear insert 316 is secured to the lower support 308 via an insert fastener 430, which in this example is a fixing screw, but may include various pins, bolts, clamps, etc.

[0044] In this example, the gap 404 separates the lower blade 312 from the gap control arm 314. In this configuration, the gap control arm 314 extends beyond the mounting surface 408 to at least partially overlap with the lower blade 312. The arm profile 432 is also shown as including a planar contact surface 500 and an inner arm surface 412, which is shown to be substantially vertical and / or approximately perpendicular to the planar contact surface 400, but as mentioned above, it can include various bevels, shapes, etc. A leading edge 502 is disposed in front of the recess 428. In other words, the leading edge 502 provides separation, such that the leading edge 502 is closer to the end 504 of the lower blade 312. The illustrated recess 428 includes a recess profile 506, which is specifically shaped to conform to the wear insert 316. As described above, the fit between the recess 428 and the wear insert 316 can be loose, such that axial and / or lateral movement of the wear insert 316 can be achieved at least to a certain extent (e.g., within a threshold tolerance).

[0045] like Figure 5 As shown, the wear insert 316 includes an insert contact surface 508 that extends below the planar contact surface 500. However, it should be understood that the insert contact surface 508 may be substantially flush with or recessed relative to the planar contact surface 500. Furthermore, in various embodiments, the insert contact surface 508 may be below the planar contact surface 500 in a non-actuated position, but may be offset to be substantially flush with the planar contact surface 500 when interacting with the notch 318. In this configuration, the insert contact surface height 510 may be lower than the planar contact surface height 512. It should be understood that references to "higher" and "lower" surfaces are relative to each other. Figure 5 Regarding the orientation shown. As an example, in an inverted embodiment (e.g., with the clearance control arm 314 and wear insert 316 arranged on the upper support), it should be understood that if the clearance control arm 314 is on the lower support, the wear insert contact surface 308 will be higher than the clearance control contact surface 300. It should be understood that the wear insert 316 may be specifically selected as a replaceable or wearable component designed to wear out earlier or otherwise be maintained than the lower support 308. The illustrated insert contact surface 508 extends the insert length 514, which is at least a portion of the arm length 426; however, it should be understood that specific dimensions may be selected based on operating conditions. Furthermore, the wear insert 316 may be formed of a material different from that of the lower support 308. For example, the wear insert 316 may be formed of a softer metal.

[0046] Figure 5The wear insert 316 shown may not be aligned with the inner surface 412. For example, the wear insert 316 may include a vertical insert extension 516 that is biased or otherwise recessed into the recess 428 such that the inner surface 412 extends inward toward the axis 410 further than the vertical insert extension 516. However, it should also be understood that in other embodiments, the inner surface 412 and the vertical insert extension 516 may be substantially aligned. Furthermore, it should be understood that... Figure 5 The various surfaces and edges shown elsewhere in this document may include chamfers, bevels, fillets, J-grooves, etc. During operation, as the lower support 308 and upper support 306 move toward each other, the wear insert 316 can be positioned to contact the cut 318 to maintain gap control between the gates, thereby enabling the cutting of other tubular structures and cables, such as wires.

[0047] Figure 6 This is a perspective view of one embodiment of the wear insert 316. In this example, the wear insert 316 is essentially “J-shaped” or “boot-shaped,” but it should be understood that the wear insert 316 can be a variety of different shapes corresponding to the recess 428. For example, the wear insert 316 can be “T-shaped” or “U-shaped” or any other reasonable shape. This example shows the insert contact surface 508 and the vertical insert extension 516. Furthermore, the illustrated insert length 514 is shown, with the vertical insert extension 516 closer to one end than the other. As stated, this configuration is for illustrative purposes, and various positions and their corresponding dimensions of the components can be adjusted based on anticipated operating conditions.

[0048] In this example, lateral ridges 600 and vertical ridges 602 are shown along length 514 and vertical insert extension 516, respectively. These ridges 600, 602 may represent variations in insert thickness 604. As mentioned above, thickness 604 may vary at different locations, such that the wear insert 316 may not be flush with the inner arm surface 412. It should be understood that these features may be specifically selected based on operating conditions, etc., and furthermore, ridges 600, 602 may be pointed, curved, or any other reasonable shape. Additionally, ridges 600, 602 may be replaced by gaps or grooves.

[0049] Figure 7This is a perspective view of one embodiment of a cut 318 formed in the upper blade 310. In this example, the upper blade 310 is coupled to the upper bracket 306 at the upper bracket mounting surface 444. It should be understood that the overlapping portion 700 of the upper bracket mounting surface 444 is provided for illustrative purposes, and in other embodiments, the overlapping portion 700 may be omitted. Furthermore, in other embodiments, the upper bracket mounting surface 444 may include various holes and / or extensions for engaging the upper blade 310. In this example, the upper bracket 306 includes a body portion 702 with a stabilizing arm 704 arranged outward from the upper blade 310 (e.g., radially outward from axis 410). The stabilizing arm 704 may prevent lateral movement of the upper blade 310 and provide guidance for the mounting position of the upper blade 310; however, it should be understood that various configurations may omit or modify the stabilizing arm 704. Furthermore, the stabilizing arm 704 may include additional holes for securing the upper blade 310 to the upper bracket 306.

[0050] As described above, the cut 318 includes a cut profile 436 that may substantially correspond to the arm profile 432 and / or at least a portion of the wear insert 316 to facilitate contact between components. In this example, the cut 318 includes a variable cut thickness 706, wherein the front thickness 708 at the first region 710 is less than the rear thickness 712 at the second region 714. In this example, "front" refers to the cut edge and / or portion that will initially interact with the lower support 309. The translation portion 716 is positioned between the first region 710 and the second region 714 and includes an inclined surface 718. It should be understood that the construction of the cut 318 may also be described as having a stepped geometry. In operation, the first region 710, the second region 714, and / or the translation portion 716 may interact with the wear insert 316 and / or the clearance control arm 314 to facilitate cutting operations. For example, in some embodiments, the first region 710 gradually decreases to allow the blades to deflect when shearing a larger diameter tubular object without driving shear force loads into the wear insert 316 and the gap control arm 314. The translation portion 716 and the second region 714 may be selected to ensure that the blade gap is controlled when the two blades are shearing the edge / interface of the cable, while minimizing the amount of shear force load applied to the wear insert 316 and the gap control arm 314 during shearing of the tubular object. It should be understood that “minimizing” shear force refers to the process of reducing or substantially redirecting the shear force from the wear insert 316 and / or the gap control arm 314. For example, minimizing shear force may correspond to reducing the shear force applied to the wear insert 316 and / or the gap control arm 314 by a threshold amount or percentage, such as a reduction of approximately 10% to 50%, etc.

[0051] As described above, the illustrated embodiment includes a cut profile 436, wherein the cut wall 438 is positioned substantially perpendicular to the cut surface 440. In this example, the profile is positioned at a translational portion between the wall 438 and the surface 440, but as described above, various other translational portions may be included. The surface 440 extends a surface width 720 for most of the cut length 442; however, at the tip 722, the tip width 724 is greater than the surface width 720. This configuration is for illustrative purposes, and it should be understood that in various embodiments, the tip 722 may be omitted; however, the tip 722 and the increased tip width 724 improve alignment, allowing the wear insert 316 to be captured at the tip 722 and guided along the cut 318.

[0052] Based on the aforementioned variable thickness, the illustrated embodiment also shows a variable wall height 726, wherein the front wall height 728 is lower than the rear wall height 730.

[0053] Figure 8 This is a side view of the clearance control arm 314 positioned near the lower blade 312 coupled to the lower support 308. As described above, the illustrated embodiment includes an arm profile 432 having a planar contact surface 500 and an insert contact surface 508. The configuration shown illustrates a loose-fit arrangement of the wear insert 316, where minute movement is achieved within the recess 428. In this configuration, at least a portion of the wear insert 316 is arranged axially lower than the planar contact surface 500 (e.g., closer to the mounting base 406). Furthermore, the leading edge 502 is shown laterally forward of the wear insert 316, for example, closer to the end 504 of the lower blade 312.

[0054] Figure 9 This is a front view of the lower block 304. In this example, the lower blade 312 is connected to the lower support 308 via fasteners 400. It should be understood that although two fasteners 400 are shown in this example, more or fewer fasteners may be used. Furthermore, embodiments of this disclosure are not limited to threaded fasteners. By way of example, clamps, studs, etc., may also be used to secure the lower blade 312 to the lower support 308.

[0055] Figure 9The diagram also shows a lower axial arrangement of the insert contact surface 508 compared to the planar contact surface 500. This arrangement allows the wear insert 316 to first contact the opposing upper blade 310, thereby concentrating the frictional force along the wear insert 316, which, as mentioned above, is a removable and replaceable component. Therefore, compared to larger and more expensive components (such as supports 306, 308), operating costs are reduced by concentrating replacement and repair on removable components (such as the wear insert 316 and the upper blade 310). In operation, the gap 404 receives the upper blade 310 and provides gap control to keep the blades close together. Furthermore, this arrangement still allows for the full pipe width of the blades 310, 312, enabling the cutting of larger diameter pipes while still being able to cut cables.

[0056] Figure 10 This is a side view of the cut 318 positioned along the lower blade. As described above, the cut 318 includes a cut profile 436, which can be described as a geometrically stepped profile due to the height difference between the first region 710 and the second region 714. In this example, the tilting translation portion 716 is implemented to vary between regions 710 and 714, and this variation is at least partially illustrated by the variation in the thicknesses 708 and 712 of the associated regions. This configuration substantially conforms to the arm profile 432, thereby providing a close fit for cutting operations.

[0057] In this example, a notch 318 is formed in the upper blade 310, which, as described above, is a removable and replaceable part. Therefore, damage to the upper blade 310 and / or the notch 318 can be easily replaced, for example, by removing the fastener 400, rather than replacing or machining the entire component, such as the upper bracket 306.

[0058] Figure 11 This is a front view of the upper block 302, showing a cut 318 formed along the outer edge 434 of the upper blade 310. In this embodiment, the cut 318 is formed on the outside of the cutting surface of the upper blade 310. Additionally, in this example, configuring the system to capture the entire wellbore reduces or eliminates the need for a centralizer. The tip 722 is shown with a variable width, wherein the tip width 724 is greater than the surface width 720 due to the wall 438. Furthermore, a variable wall height 726 is shown according to the varying profile 436.

[0059] Figure 12This is a line drawing illustrating one embodiment of operating conditions 1200 of the interface between the clearance control arm 314 and the cut 318. In this example, the upper block 302 and the lower block 304 move toward each other to drive the blades 310, 312 together to cut tubular objects and / or cables. The illustrated example shows the interaction between the clearance control arms 314, which are arranged axially above the cut 318. In this example, initial contact occurs via the wear insert 316. It should be understood that in some embodiments, and in various embodiments, the clearance control arms 314 may initially contact and / or substantially simultaneously. As shown, the insert contact surface 508 engages the cut surface 440, specifically, in this example, the inclined surface 718. It may be necessary to focus the frictional contact interface on easily replaceable components such as the wear insert 316 and the upper blade 310, etc. Figure 12 As shown, this is to reduce operating costs or simplify maintenance operations.

[0060] Figure 13 This is a line drawing illustrating one embodiment of the operating conditions 1200 of the interface between the clearance control arm 314 and the cut 318. This continuous movement of the upper block 302 and the lower block 304 toward each other illustrates the contact between the insert contact surface 508 and the second region 714. Additionally, the variable height associated with the planar contact surface 500 can substantially correspond to the variable cut profile 436, thereby ensuring a tight fit between the components, which in some embodiments may also include contact between the clearance control element 314 and the lower blade 312. It should be understood that in various embodiments, the wear insert 316 may or may not contact the upper blade 310 at the end of the gate stroke.

[0061] Although the technology described herein has been illustrated with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the technology. Therefore, it should be understood that various modifications can be made to the exemplary embodiments and other arrangements can be designed without departing from the spirit and scope of the technology as defined by the appended claims.

Claims

1. A shear gate system, comprising: An upper block, connected to a first arm, is positioned to translate from a first position outside the boring hole to a second position inside the boring hole. The upper block includes an upper blade having a cut formed at a radially outward end, the cut having a cut profile. A lower block, connected to a second arm, is positioned to translate from a first position outside the bore to a second position inside the bore. The lower block includes a clearance control arm comprising a removable wear insert arranged axially above the lower blade, the wear insert being secured by a wear insert fastener. The clearance control arm has an arm profile conforming to the cut profile, and at least a portion of the clearance control arm overlaps with at least a portion of the lower blade, such that a gap is formed between the clearance control arm and the lower blade. When the upper block and the lower block move to the second position, the gap receives a portion of the upper blade, and the wear insert of the gap control arm engages the cut in the upper blade; The cut profile is a geometrically stepped profile with variable thickness along the cut length.

2. The shear gate system according to claim 1, wherein the planar contact surface of the gap control arm is axially higher than the insert contact surface of the wear insert.

3. The shear gate system according to claim 1, wherein the upper blade and the lower blade are each detachably connected to the respective upper block and lower block.

4. The shear gate system according to claim 1, wherein the gap control arm further comprises: A recess for receiving the wear insert, the recess including a recess profile corresponding to the wear insert.

5. The shear gate system according to claim 1, further comprising: A second cut is formed at the second radially outward end of the upper blade, and the second cut is positioned opposite to the cut. and A second clearance control arm having a second wear insert, the second clearance control arm being positioned opposite the clearance control arm; The cut is aligned with the gap control arm, and the second cut is aligned with the second gap control arm.

6. The shear gate system of claim 1, wherein both the cut and the gap control arm are arranged radially outward from the full bore span of the tubular body positioned between the upper block and the lower block.

7. The shear gate system of claim 1, wherein at least a portion of the cut overlaps with at least a portion of the lower blade at the second position.

8. A wellhead, comprising: A tubular body, the tubular body being fluidly connected to a wellbore, the tubular body having a bore; and A pressure control device, positioned to extend into the bore, the pressure control device comprising: The lower support is arranged in a first position near the boring hole and in a second position within the boring hole. The lower support includes a clearance control arm, which is arranged axially above the mounting base and includes a recess configured to receive a removable wear insert secured by a wear insert fastener. A lower blade is attached to the lower support; a wear insert is axially higher than the lower blade. Upper support, the upper support being arranged in a first position near the boring hole and in a second position within the boring hole; and An upper blade, coupled to an upper support, includes a slit formed at a radially outward position relative to the cutting surface of the upper blade, the slit having a slit profile configured to receive a gap control arm when the lower support and the upper support are in a second position, the gap control arm having an arm profile conforming to the slit profile and at least a portion of the gap control arm overlapping at least a portion of the lower blade, such that a gap is formed between the gap control arm and the lower blade; The cut profile formed in the upper blade includes a cut wall and a cut surface, and When the lower support and the upper support are in the second position, the gap receives a portion of the upper blade, and the insertion contact surface of the wear insert contacts the cutting surface of the upper blade. The cut profile is a geometrically stepped profile, and the thickness of the geometrically stepped profile varies along the cut length.

9. The wellhead of claim 8, wherein the removable wear insert is loosely fitted with the recess, and wherein the wear insert fastener is configured to allow axial movement of the removable wear insert in the recess when the removable wear insert contacts the upper blade before the clearance control arm.

10. The wellhead according to claim 8, wherein the wear insert comprises: The vertical insert extension, when the detachable wear insert is fixed in the recess, is flush with or offset from the inner surface of the gap control arm. When the removable wear insert is fixed in the recess, the contact surface of the insert is flush with or offset from the planar contact surface of the gap control arm.

11. The wellhead of claim 8, wherein the geometric stepped profile includes a translational portion having an inclined surface positioned to engage at least a portion of the wear insert when the upper support and the lower support are moved to the second position.

12. The wellhead of claim 8, wherein the upper blade is a detachable component connected to the upper support via fasteners.

13. The wellhead of claim 8, wherein the pressure control device is configured to shear the pipe and cut the cable.

14. A blowout preventer, comprising: Boring, wherein the boring hole is fluidly connected to the wellbore; and A pressure control device, positioned to extend into the bore, the pressure control device comprising: An upper block, connected to a first arm, is positioned to translate from a first position outside the boring hole to a second position inside the boring hole. The upper block includes an upper blade having a cut formed at a radially outward end, the cut having a cut profile. A lower block, connected to a second arm, is positioned to translate from a first position outside the bore to a second position inside the bore. The lower block includes a clearance control arm comprising a removable wear insert secured by a wear insert fastener. The wear insert is arranged axially higher than the lower blade and partially overlaps the lower blade, such that a gap is formed between the wear insert and the lower blade. The gap control arm has an arm profile that conforms to the cut profile; When the upper block and the lower block move to the second position, the gap receives a portion of the upper blade and the wear insert of the gap control arm engages with the cut in the upper blade. The cut profile is a geometrically stepped profile with variable thickness along the cut length.

15. The blowout preventer of claim 14, wherein the planar contact surface of the gap control arm is axially higher than the insert contact surface of the wear insert.

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