Casing head device for oil and gas production

Abstract

The present invention provides a casing head device for oil and gas production, comprising a casing head body, a straight through hole cavity is opened in the middle of the casing head body, the straight through hole cavity is used to install a first spindle hanger and a second spindle hanger, the hole cavity adjustment mechanism comprises N hole cavity adjustment plate assemblies, the N hole cavity adjustment plate assemblies surround an installation cavity for installing the first spindle hanger and the second spindle hanger, and the N hole cavity adjustment plate assemblies can move towards or away from each other to reduce or increase the cavity diameter size of the installation cavity; the present invention can adjust the cavity diameter size of the installation cavity by adjusting the hole cavity adjustment mechanism, so that a single type of casing head body can be suitable for the installation of multiple types of first spindle hangers and second spindle hangers through the installation cavity, so that the single type of casing head body has a wider application range, thereby greatly reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas production equipment, and in particular to a casing head device for oil and gas production. Background Art

[0002] The casing head is the basic part of the wellhead device of the oil and gas well, which is mainly used to fix and connect the downhole casing, reliably seal the space of each layer of casing, and control the pressure of the casing space. The commonly used two-stage casing head is mainly composed of a conversion flange, a casing head body, a first mandrel hanger, a second mandrel hanger, a base and a slip hanger. The conversion flange and the casing head body are connected together by connecting bolts and locking nuts. A straight-through cavity is arranged in the casing head body, wherein the first mandrel hanger is assembled in the straight-through upper cavity of the casing head body, the second mandrel hanger is assembled in the straight-through lower cavity of the casing head body, the base is connected to the bottom end of the casing head body, and the slip hanger (not shown in the figure) is assembled on the upper part of the second mandrel hanger. However, the diameter of the through hole of the existing single casing head body cannot be adjusted. Therefore, for adaptation, only a single-sized first spindle hanger and a second spindle hanger can be installed. Large-sized first spindle hangers and second spindle hangers cannot be installed in the through hole. After small-sized first spindle hangers and second spindle hangers are installed in the through hole, there is a large gap between them and the wall of the through hole, resulting in a problem of loose fixation. In order to solve the above problems, the present invention proposes a casing head device for oil and gas production. Summary of the invention

[0003] To achieve the above-mentioned purpose, the present invention provides a casing head device for oil and gas production, including a casing head body, a straight through hole cavity is opened in the middle of the casing head body, the straight through hole cavity is used to install a first spindle hanger and a second spindle hanger, and a hole adjustment mechanism is arranged in the straight through hole cavity and used to adjust the aperture of the straight through hole cavity, the hole adjustment mechanism includes N hole adjustment plate assemblies, the N hole adjustment plate assemblies surround an installation cavity for installing the first spindle hanger and the second spindle hanger, the N hole adjustment plate assemblies can move towards or away from each other to reduce or increase the cavity diameter size of the installation cavity, wherein N is a positive integer greater than or equal to 2.

[0004] Optionally, the cavity adjustment mechanism also includes a second guide limit assembly for driving the cavity adjustment plate assembly to move radially along the through cavity, the two ends of the second guide limit assembly are respectively fixedly connected to the side wall of the cavity adjustment plate assembly and the side wall of the through cavity, the second guide limit assembly includes a second guide limit rod, a second guide limit cylinder and a second guide limit spring, the second guide limit rod is movably inserted in the second guide limit cylinder, the second guide limit spring is wound outside the second guide limit rod, and the two ends of the second guide limit spring are respectively fixedly connected to the side wall of the second guide limit rod and the outer wall of the second guide limit cylinder.

[0005] Optionally, the cavity adjustment mechanism also includes a first driving structure, which includes a rotating shaft fixedly arranged on the side wall of the cavity adjustment plate assembly, the free end of the rotating shaft is rotatably connected to a threaded rod, the threaded rod is threadedly inserted in a threaded hole, the threaded hole is opened on the casing head body, and the end of the threaded rod away from the rotating shaft is fixedly connected to the adjustment plate.

[0006] Optionally, the cavity adjustment plate assembly includes a cavity adjustment plate body, and a buffer cavity opened in the cavity adjustment plate body, a push column is movably inserted into the cavity adjustment plate body, the push column is connected to the rotating shaft, one end of the push column located in the buffer cavity is fixedly connected to a push plate, the push plate is movably arranged in the buffer cavity, a buffer mechanism is arranged in the buffer cavity, and both ends of the buffer mechanism are respectively fixedly connected to the lower end surface of the push plate and the bottom wall of the buffer cavity.

[0007] Optionally, the buffer mechanism is a first guide limit assembly, which includes a first guide limit rod, a first guide limit cylinder and a first guide limit spring, the first guide limit rod is movably inserted in the first guide limit cylinder, the first guide limit spring is wound and arranged outside the first guide limit rod, and the two ends of the first guide limit spring are respectively fixedly connected to the side wall of the first guide limit rod and the outer side wall of the first guide limit cylinder.

[0008] Optionally, it also includes a prompt mechanism, which includes a fixed tube fixedly set on the lower end surface of the push plate, M first impact balls fixedly set on the inner side wall of the fixed tube, a second metal ball is set directly below the fixed tube, the second metal ball is movably set in the buffer hole cavity, the lower end of the second metal ball is fixedly connected to the first connecting rod, the lower end of the first connecting rod is fixedly connected to the bottom wall of the buffer hole cavity, wherein the M first impact balls are divided into two groups, the two groups of first impact balls are symmetrically arranged about the vertical center line of the fixed tube, and M is a positive even number greater than or equal to 2.

[0009] Optionally, it also includes a snap-in tooth assembly, wherein a plurality of the snap-in tooth assemblies are provided, and the plurality of the snap-in tooth assemblies are divided into two groups, and the two groups of the snap-in tooth assemblies are symmetrically arranged about the central axis of the push plate, and the snap-in tooth assembly includes a snap-in tooth body fixedly arranged on the lower end surface of the push plate, and a through hole connected to the buffer hole cavity is opened on the hole adjustment plate body, and the through hole is matched with the snap-in tooth body.

[0010] Optionally, it also includes a second driving structure, which includes a driving cylinder, which is fixedly arranged on the first support ring, a second connecting rod is fixedly connected to the inner side wall of the first support ring, the free end of the second connecting rod is fixedly connected to the side wall of the casing head body, the driving end of the driving cylinder is connected to a cylinder arm, the free end of the cylinder arm is fixedly connected to a support plate, the end of the support plate away from the cylinder arm is fixedly connected to a sliding rod, the sliding rod is movably inserted into the casing head body, and the end of the sliding rod away from the support plate is fixedly connected to the side wall of the cavity adjustment plate assembly.

[0011] Optionally, it also includes a third driving structure, wherein the third driving structure includes a driving motor, a side wall of the driving motor is fixedly connected to a third connecting rod, the free end of the third connecting rod is fixedly connected to the side wall of the casing head body, the driving end of the driving motor is connected to a fourth connecting rod, the fourth connecting rod is fixedly sleeved with a first gear outside the fourth connecting rod, the first gear and the second gear are meshed with each other, the second gear is fixedly sleeved outside the second support ring, the rear end of the second support ring is fixedly connected to a third gear, the third gear and the fourth gear are meshed with each other, the fourth gear is fixedly sleeved outside the inner spiral cylinder, the inner spiral cylinder is rotatably arranged on the third support ring, a fifth connecting rod is fixedly connected to the inner side wall of the third support ring, the free end of the fifth connecting rod is fixedly connected to the casing head body, the inner thread of the inner spiral cylinder is plugged with an outer spiral rod, the outer spiral rod is movably plugged into the third support ring, and one end of the outer spiral rod located outside the inner spiral cylinder is fixedly connected to the supporting plate.

[0012] Optionally, the third driving structure also includes a support assembly, and a plurality of the support assemblies are provided. The plurality of the support assemblies are arranged in an equidistant ring on the second support ring, and the support assembly includes a sixth connecting rod, one end of the sixth connecting rod is fixedly connected to the side wall of the casing head body, and the other end of the sixth connecting rod is fixedly connected to a U-shaped support plate, and the U-shaped support plate is buckled on the outside of the second support ring, and a support slider is fixedly provided on the inner top wall and the inner bottom wall of the second support ring, and the support slider is slidably provided in an annular groove, and the two annular grooves are respectively provided on the upper end surface and the lower end surface of the second support ring.

[0013] The beneficial effects of the present invention are as follows:

[0014] The present invention provides a bore adjustment mechanism in the straight bore of the casing head body. The provision of the bore adjustment mechanism can add an installation cavity for installing a first spindle hanger and a second spindle hanger in the straight bore. The bore adjustment mechanism has a reasonable structural design. The bore diameter of the installation cavity can be adjusted by adjusting the bore adjustment mechanism. Thus, a single-model casing head body can be suitable for the installation of multiple-model first spindle hangers and second spindle hangers through the installation cavity, thereby making the application range of a single-model casing head body wider, thereby greatly reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the existing oil and gas production casing head;

[0016] Figure 2 It is a structural schematic diagram of a first embodiment of a casing head device for oil and gas production according to the present invention;

[0017] Figure 3 The casing head device for oil and gas production of the present invention Figure 2 A schematic diagram of the enlarged structure in the middle;

[0018] Figure 4 It is a structural schematic diagram of a second embodiment of a casing head device for oil and gas production according to the present invention;

[0019] Figure 5 It is a cross-sectional schematic diagram of a first driving structure of a second embodiment of a casing head device for oil and gas production according to the present invention;

[0020] Figure 6 It is a schematic structural diagram of a cavity adjustment plate assembly in a casing head device for oil and gas production according to the present invention;

[0021] Figure 7 It is a structural schematic diagram of a cavity adjustment plate assembly in a casing head device for oil and gas production according to the present invention;

[0022] Figure 8 The casing head device for oil and gas production of the present invention Figure 7 Middle B is an enlarged schematic diagram of the structure;

[0023] Fig. 9 It is a schematic structural diagram of a clamping tooth assembly in a casing head device for oil and gas production according to the present invention;

[0024] Fig.10 It is a schematic diagram of a second driving structure of a second embodiment of a casing head device for oil and gas production according to the present invention;

[0025] Fig.11 It is a schematic diagram of the third driving structure of the second embodiment of the casing head device for oil and gas production of the present invention;

[0026] Fig.12 It is a schematic diagram of a partially enlarged bottom view of the second support ring in the casing head device for oil and gas production of the present invention;

[0027] Fig.13 The casing head device for oil and gas production of the present invention Fig.11 A magnified schematic diagram of the local structure;

[0028] Fig.14 The casing head device for oil and gas production of the present invention Fig.13 Schematic diagram of the structure in cross-section;

[0029] Fig.15 The casing head device for oil and gas production of the present invention Fig.11 Schematic diagram of the left-side cross-sectional structure of the middle support assembly.

[0030] Reference numerals

[0031] Casing head body 1, straight hole cavity 2, first mandrel hanger 3, second mandrel hanger 4,

[0032] Cavity adjustment mechanism 5, cavity adjustment plate assembly 51, cavity adjustment plate body 511, buffer cavity 512, push column 513, push plate 514, first guide limiting assembly 515, first guide limiting rod 5151, first guide limiting cylinder 5152, first guide limiting spring 5153, second guide limiting assembly 52, second guide limiting rod 521, second guide limiting cylinder 522, second guide limiting spring 523, rotating shaft 53, threaded rod 54, threaded hole 55, adjustment plate 56,

[0033] Prompt mechanism 6, fixed tube 61, first impact ball 62, second metal ball 63, first connecting rod 64,

[0034] The card-joint tooth assembly 7, the card-joint tooth body 71, the through hole 72,

[0035] The second driving structure 8, the driving cylinder 81, the first supporting ring 82, the second connecting rod 83, the cylinder arm 84, the supporting plate 85, the sliding rod 86,

[0036] The third driving structure 9, the driving motor 91, the third connecting rod 92, the fourth connecting rod 93, the first gear 94, the second gear 95, the second support ring 96, the fifth connecting rod 97, the third gear 98, the fourth gear 99, the inner spiral cylinder 910, the third support ring 911, the outer spiral rod 913, the support assembly 914, the sixth connecting rod 9141, the U-shaped support plate 9142, the support slider 9143, and the annular groove 9144. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field of the present invention. The words "including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0038] The diameter of the through hole 2 of the existing casing head body 1 cannot be adjusted. Figure 1 As shown, for the purpose of adaptation, a single model of the casing head body 1 can only adapt to a single model of the first mandrel hanger 3 and the second mandrel hanger 4. Thus, in order to adapt to different models of the first mandrel hanger 3 and the second mandrel hanger 4, different models of the casing head body 1 need to be produced, which will greatly increase the production cost.

[0039] In view of the problems existing in the prior art, an embodiment of the present invention provides a casing head device for oil and gas production, such as Figure 2 As shown, it includes a casing head body 1, a through hole 2 is opened in the middle of the casing head body 1, and the through hole 2 is used to install a first spindle hanger 3 and a second spindle hanger 4; and a hole adjustment mechanism 5 is arranged in the through hole 2 and used to adjust the aperture of the through hole 2; the hole adjustment mechanism 5 includes N hole adjustment plate assemblies 51, and the N hole adjustment plate assemblies 51 surround an installation cavity for installing the first spindle hanger 3 and the second spindle hanger 4. It is worth noting that the installation cavity and the through hole 2 The coaxial setting can be understood as that the central axis of the through hole cavity 2 and the installation cavity are on the same vertical center line; the N cavity adjustment plate assemblies 51 can move towards or away from each other (which can be understood as the radial movement of the cavity adjustment plate assembly 51 along the through hole cavity 2) to reduce or increase the cavity diameter of the installation cavity, wherein N is a positive integer greater than or equal to 2. In actual use, the number of the cavity adjustment plate assemblies 51 can be set to two, and the two cavity adjustment plate assemblies 51 are symmetrically arranged about the center of the through hole cavity 2, such as Figure 2As shown, of course in other examples, the number of the cavity adjustment plate assemblies 51 can also be set to 3, 4, 5, or more. When the number of the cavity adjustment plate assemblies 51 is 3, 4, 5, or more, preferably, they are arranged in a ring shape with equal distances around the central axis of the straight cavity 2.

[0040] It is worth noting that the N cavity adjustment plate assemblies 51 can move towards or away from each other to reduce or increase the diameter of the installation cavity, so that a single type of casing head body 1 can be installed with more different types of first spindle hangers 3 and second spindle hangers 4, thereby making the casing head body 1 more applicable. At the same time, it can also achieve the effect of convenient installation and disassembly of the first spindle hanger 3 and the second spindle hanger 4. In this way, when the first spindle hanger 3 and the second spindle hanger 4 are damaged, the first spindle hanger 3 and the second spindle hanger 4 can be replaced or maintained more conveniently.

[0041] When the cavity adjustment plate assembly 51 moves in the through cavity 2, in order to ensure that the cavity adjustment plate assembly 51 always moves in the radial direction of the through cavity 2, in one embodiment, Figure 3 As shown, the cavity adjustment mechanism 5 also includes a second guide and limit assembly 52 for driving the cavity adjustment plate assembly 51 to move along the radial direction of the through cavity 2. The two ends of the second guide and limit assembly 52 are respectively fixedly connected to the side wall of the cavity adjustment plate assembly 51 and the side wall of the through cavity 2. The second guide and limit assembly 52 includes a second guide and limit rod 521, a second guide and limit cylinder 522 and a second guide and limit spring 523. The second guide and limit rod 521 is movably inserted in the second guide and limit cylinder 522. The second guide and limit spring 523 is wound and arranged outside the second guide and limit rod 521. The two ends of the second guide and limit spring 523 are respectively fixedly connected to the side wall of the second guide and limit rod 521 and the outer wall of the second guide and limit cylinder 522. The arrangement of the second guide and limit assembly 52 can not only enable the cavity adjustment plate assembly 51 to move in the radial direction of the through cavity 2, but also enable the movement of the cavity adjustment plate assembly 51 to always be in the radial direction of the through cavity 2.

[0042] In order to achieve operability and convenient operation of the movement of the cavity adjustment plate assembly 51, in one embodiment, as Figure 3As shown, the cavity adjustment mechanism 5 also includes a first driving structure, which includes a rotating shaft 53 fixedly arranged on the side wall of the cavity adjustment plate assembly 51, and the free end of the rotating shaft 53 is rotatably connected to a threaded rod 54, and the threaded rod 54 is threadedly inserted in a threaded hole 55. The threaded hole 55 is provided on the casing head body 1, and the end of the threaded rod 54 away from the rotating shaft 53 is fixedly connected to an adjustment plate 56. The adjusting plate 56 is screwed manually or by a tool, and the rotation of the adjusting plate 56 will move the threaded rod 54. Since the threaded rod 54 is threadedly inserted in the threaded hole 55, the threaded rod 54 will rotate to move inward or outward of the straight bore 2, thereby pushing or pulling the bore adjusting plate assembly 51 to move closer to or away from the central axis of the straight bore 2 along the radial direction of the straight bore 2; when moving closer to the central axis of the straight bore 2, the first spindle hanger 3 and the second spindle hanger 4 will be clamped and fixed, or the casing head body 1 will be suitable for the first spindle hanger 3 and the second spindle hanger 4 of small size; when moving away from the central axis of the straight bore 2, the first spindle hanger 3 and the second spindle hanger 4 will be loosened and unlocked, or the casing head body 1 will be suitable for the first spindle hanger 3 and the second spindle hanger 4 of large size.

[0043] It can be understood that, assuming that the aperture of the through-hole cavity 2 is twice the standard diameter, the sizes of the first mandrel hanger 3 and the second mandrel hanger 4 are compared with the standard sizes of the first mandrel hanger 3 and the second mandrel hanger 4, and the standard sizes of the first mandrel hanger 3 and the second mandrel hanger 4 are matched with the standard sizes of the through-hole cavity 2. It can be understood that the first mandrel hanger 3 and the second mandrel hanger 4 of standard sizes can be just installed in the through-hole cavity 2 of standard sizes.

[0044] By adjusting the bore adjustment plate assembly 51, the bore adjustment plate assembly 51 is squeezed onto the surface of the first spindle hanger 3 and the second spindle hanger 4. In order to avoid damaging the first spindle hanger 3, the second spindle hanger 4 or the bore adjustment plate assembly 51, in one embodiment, Figure 6 As shown, the cavity adjustment plate assembly 51 includes a cavity adjustment plate body 511, and a buffer cavity 512 opened in the cavity adjustment plate body 511, a push column 513 is movably inserted on the cavity adjustment plate body 511, and the push column 513 is connected to the rotating shaft 53, and one end of the push column 513 located in the buffer cavity 512 is fixedly connected to a push plate 514, and the push plate 514 is movably set in the buffer cavity 512, and a buffer mechanism is set in the buffer cavity 512, and the two ends of the buffer mechanism are respectively fixedly connected to the lower end surface of the push plate 514 and the bottom wall of the buffer cavity 512.

[0045] During operation, when the cavity adjustment plate body 511 is squeezed onto the surfaces of the first spindle hanger 3 and the second spindle hanger 4, as the thrust continues to be provided, the push column 513 will move into the buffer cavity 512, thereby pushing the push plate 514 to move downward in the buffer cavity 512. The downward movement of the push plate 514 will cause the first guide limit assembly 515 to be squeezed, and the elastic force of the first guide limit assembly 515 itself will play a buffering role, thereby protecting the first spindle hanger 3, the second spindle hanger 4 or the cavity adjustment plate assembly 51; at the same time, the setting of the first guide limit assembly 515 can also limit the push plate 514 to move only in the vertical direction, thereby preventing the push plate 514 from being damaged by the tilting movement, and at the same time, when the push plate 514 loses the downward thrust, a reset force will be provided for the reset of the push plate 514.

[0046] In order to achieve better limiting and buffering effects, in one embodiment, Figure 6 As shown, the buffer mechanism is a first guide limit assembly 515, which includes a first guide limit rod 5151, a first guide limit cylinder 5152 and a first guide limit spring 5153. The first guide limit rod 5151 is movably inserted in the first guide limit cylinder 5152, and the first guide limit spring 5153 is wound around the outside of the first guide limit rod 5151. The two ends of the first guide limit spring 5153 are respectively fixedly connected to the side wall of the first guide limit rod 5151 and the outer side wall of the first guide limit cylinder 5152.

[0047] In order to remind the operator to receive the reminder that the cavity adjustment plate body 511 is squeezed to the first spindle hanger 3 and the second spindle hanger 4 in time, in one embodiment, as Figure 7 and Figure 8As shown, the casing head device for oil and gas production also includes a prompting mechanism 6, which includes a fixed tube 61 fixedly arranged on the lower end surface of the pushing plate 514, and M first impact balls 62 are fixedly arranged on the inner side wall of the fixed tube 61. A second metal ball 63 is arranged directly below the fixed tube 61, and the second metal ball 63 is movably arranged in the buffer cavity 512. The lower end of the second metal ball 63 is fixedly connected to a first connecting rod 64, and the lower end of the first connecting rod 64 is fixedly connected to the bottom wall of the buffer cavity 512. When the second metal ball 63 impacts and passes over the first impact ball 62, a first connecting rod 64 is formed. The vibration and sound generated thereby serve as a reminder to the operator. Preferably, both the first impact ball 62 and the second metal ball 63 are made of metal; wherein, the M first impact balls 62 are divided into two groups, and the two groups of the first impact balls 62 are symmetrically arranged about the vertical center line of the fixed tube 61, and M is a positive even number greater than or equal to 2. Such an arrangement enables the second metal ball 63 to better and more effectively impact the first impact ball 62, and during the impact, the two sides of the first impact ball 62 are impacted by the second metal ball 63 in unison, so that the second metal ball 63 can move upward in the vertical direction.

[0048] In order to make the cavity adjustment plate body 511 have a better fixing effect with the first mandrel hanger 3 and the second mandrel hanger 4, in one embodiment, as Fig. 9 As shown, the casing head device for oil and gas production also includes a clamping tooth assembly 7, and the clamping tooth assembly 7 is provided with a plurality of the clamping tooth assemblies 7, and the plurality of the clamping tooth assemblies 7 are divided into two groups, and the two groups of the clamping tooth assemblies 7 are symmetrically arranged about the central axis of the pushing plate 514, and the clamping tooth assembly 7 includes a clamping tooth body 71 fixedly arranged on the lower end surface of the pushing plate 514, and the cavity adjustment plate body 511 is provided with a through hole 72 connected to the buffer cavity 512, and the through hole 72 is matched with the clamping tooth body 71. The setting of the clamping tooth assembly 7 is used to assist the cavity adjustment plate body 511 in the clamping and fixing process of the first spindle hanger 3 and the second spindle hanger 4, which can play a further fixing effect.

[0049] During operation, after the cavity adjustment plate body 511 is squeezed onto the first spindle hanger 3 and the second spindle hanger 4, as the push plate 514 continues to move downward, it will move downward with the engaging tooth body 71, and the engaging tooth body 71 will extend out of the through hole 72, through the extrusion contact and engaging with the first spindle hanger 3 and the second spindle hanger 4, the fastening effect is further improved, so that the first spindle hanger 3 and the second spindle hanger 4 are more firmly fixed in the straight cavity 2.

[0050] In one example, the number of the cavity adjustment plate assemblies 51 is set to 4. Figure 4 , Figure 5 and Fig.10 As shown, the four cavity adjustment plate assemblies 51 are arranged in an equidistant ring shape. By increasing the number of the cavity adjustment plate assemblies 51, the cavity adjustment plate assemblies 51 can more evenly clamp and fix the first spindle hanger 3 and the second spindle hanger 4, thereby preventing the first spindle hanger 3 and the second spindle hanger 4 from being subjected to force only on one side or only locally. This can not only make the first spindle hanger 3 and the second spindle hanger 4 more firmly fixed, but also avoid damage to the first spindle hanger 3 and the second spindle hanger 4 when subjected to force only on one side or locally.

[0051] When the number of the cavity adjustment plate assemblies 51 is four, or three, five or more, in order to make the operation process more convenient and intelligent, in one embodiment, Fig.10 As shown, the casing head device for oil and gas production also includes a second driving structure 8, and the second driving structure 8 includes a driving cylinder 81, and the driving cylinder 81 is fixedly arranged on the first support ring 82, and the second connecting rod 83 is fixedly connected to the inner side wall of the first support ring 82, and the free end of the second connecting rod 83 is fixedly connected to the side wall of the casing head body 1, and the driving end of the driving cylinder 81 is connected to a cylinder arm 84, and the free end of the cylinder arm 84 is fixedly connected to a supporting plate 85, and the end of the supporting plate 85 away from the cylinder arm 84 is fixedly connected to a sliding rod 86, and the sliding rod 86 is movably inserted into the casing head body 1, and the end of the sliding rod 86 away from the supporting plate 85 is fixedly connected to the side wall of the cavity adjustment plate assembly 51.

[0052] The setting of the second driving structure 8 can be controlled by electricity, which can make the movement process of the cavity adjustment plate assembly 51 more convenient and intelligent; specifically, during operation, when the cavity adjustment plate assembly 51 needs to be adjusted, the driving cylinder 81 is started, and the movement of the driving cylinder 81 will bring about the movement of the cylinder arm 84, and the movement of the cylinder arm 84 will bring about the radial movement of the cavity adjustment plate assembly 51 along the through cavity 2 through the supporting plate 85 and the sliding rod 86.

[0053] When the movement of the cavity adjustment plate assembly 51 is adjusted by the second driving structure 8, a single second driving structure 8 can only adjust a single cavity adjustment plate assembly 51 at the same time. When adjusting in this way, due to the control of multiple systems, it is impossible to achieve the effect of synchronous control of the cavity adjustment plate assembly 51, resulting in the first spindle hanger 3 and the second spindle hanger 4 being fixed deviating from the central axis of the straight-through cavity 2; and the control systems of the multiple sets of second driving structures 8 are also more prone to damage. In order to solve the above problems, in one embodiment, as Fig.11 , Fig.12 , Fig.13 and Fig.14 As shown, the casing head device for oil and gas production also includes a third driving structure 9, which includes a driving motor 91. The side wall of the driving motor 91 is fixedly connected to a third connecting rod 92. The free end of the third connecting rod 92 is fixedly connected to the side wall of the casing head body 1. The driving end of the driving motor 91 is connected to a fourth connecting rod 93. The fourth connecting rod 93 is fixedly sleeved with a first gear 94. The first gear 94 and the second gear 95 are meshed with each other. The second gear 95 is fixedly sleeved outside a second support ring 96. The rear end of the second support ring 96 is fixedly connected to a third gear. Wheel 98, the third gear 98 and the fourth gear 99 are meshed with each other, the fourth gear 99 is fixedly sleeved on the outside of the inner spiral cylinder 910, the inner spiral cylinder 910 is rotatably set on the third support ring 911, and the fifth connecting rod 97 is fixedly connected to the inner side wall of the third support ring 911, and the free end of the fifth connecting rod 97 is fixedly connected to the casing head body 1, the inner thread of the inner spiral cylinder 910 is inserted with an outer spiral rod 913, and the outer spiral rod 913 is movably inserted on the third support ring 911, and the end of the outer spiral rod 913 located outside the inner spiral cylinder 910 is fixedly connected to the supporting plate 85.

[0054] Compared with the second driving structure 8, the third driving structure 9 can adjust multiple cavity adjustment plate assemblies 51 at the same time, thereby realizing synchronous control of multiple cavity adjustment plate assemblies 51, which can ensure that the adjustment amplitudes of multiple cavity adjustment plate assemblies 51 are consistent and improve the adjustment effect. In addition, the driving of the third driving structure 9 only requires one set of power control system, thereby greatly reducing the probability of equipment damage. When working, the drive motor 91 is started, and the drive motor 91 rotates the first gear 94 through the fourth connecting rod 93. The rotation of the first gear 94 rotates the second support ring 96 clockwise through the second gear 95. The clockwise rotation of the second support ring 96 rotates the third gear 98 clockwise. The rotation of the third gear 98 rotates the spiral barrel 910 through the fourth gear 99. Since the inner spiral barrel 910 is internally threaded with the outer spiral rod 913, the rotation of the spiral barrel 910 causes the outer spiral rod 913 to move outward from the inner spiral barrel 910. The movement of the outer spiral rod 913 pushes the support plate 85 and the sliding rod 86 to move the cavity adjustment plate assembly 51. In this embodiment, the clockwise rotation of the third gear 98 can simultaneously rotate multiple fourth gears 99, thereby synchronously moving multiple cavity adjustment plate assemblies 51 through the combined structure of the outer spiral rod 913, the support plate 85 and the sliding rod 86.

[0055] In order to ensure that the second support ring 96 rotates only in the vertical plane and rotates with the fixed center from the outside to the inside as the axis, Fig.11 As shown, in one embodiment, Fig.15 As shown, the third driving structure 9 also includes a support assembly 914, and a plurality of the support assemblies 914 are provided. The plurality of the support assemblies 914 are arranged in an equidistant ring on the second support ring 96. The support assembly 914 includes a sixth connecting rod 9141, one end of the sixth connecting rod 9141 is fixedly connected to the side wall of the casing head body 1, and the other end of the sixth connecting rod 9141 is fixedly connected to a U-shaped support plate 9142, and the U-shaped support plate 9142 is buckled on the outside of the second support ring 96. Support sliders 9143 are fixedly provided on the inner top wall and the inner bottom wall of the second support ring 96, and the support slider 9143 is slidably provided in an annular groove 9144, and the two annular grooves 9144 are respectively provided on the upper end surface and the lower end surface of the second support ring 96.

[0056] The beneficial effects of the present invention are as follows:

[0057] The present invention provides a bore adjustment mechanism 5 in the straight bore 2 of the casing head body 1. The provision of the bore adjustment mechanism 5 can add an installation cavity for installing the first spindle hanger 3 and the second spindle hanger 4 in the straight bore 2. The structure of the bore adjustment mechanism 5 is reasonably designed. The bore diameter of the installation cavity can be adjusted by adjusting the bore adjustment mechanism 5. Therefore, a single type of casing head body 1 can be suitable for the installation of multiple types of first spindle hangers 3 and second spindle hangers 4 through the installation cavity, thereby making the application range of the single type of casing head body 1 wider, thereby greatly reducing the production cost.

[0058] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A casing head device for oil and gas production, characterized in that: The invention comprises a casing head body (1), a through hole (2) is provided in the middle of the casing head body (1), the through hole (2) is used to install a first spindle hanger (3) and a second spindle hanger (4), and a hole adjustment mechanism (5) is arranged in the through hole (2) and is used to adjust the aperture of the through hole (2), the hole adjustment mechanism (5) comprises N hole adjustment plate assemblies (51), the N hole adjustment plate assemblies (51) surround an installation cavity for installing the first spindle hanger (3) and the second spindle hanger (4), the N hole adjustment plate assemblies (51) can move towards or away from each other to reduce or increase the cavity diameter of the installation cavity, wherein N is a positive integer greater than or equal to 2; The cavity adjustment plate assembly (51) comprises a cavity adjustment plate body (511) and a buffer cavity (512) provided in the cavity adjustment plate body (511); a push column (513) is movably inserted into the cavity adjustment plate body (511); the push column (513) is connected to the rotating shaft (53); one end of the push column (513) located in the buffer cavity (512) is fixedly connected to a push plate (514); the push plate (514) is movably arranged in the buffer cavity (512); a buffer mechanism is arranged in the buffer cavity (512); two ends of the buffer mechanism are respectively fixedly connected to the lower end surface of the push plate (514) and the bottom wall of the buffer cavity (512); The device also comprises a prompt mechanism (6), the prompt mechanism (6) comprising a fixed tube (61) fixedly arranged on the lower end surface of the push plate (514), M first impact balls (62) fixedly arranged on the inner side wall of the fixed tube (61), a second metal ball (63) arranged directly below the fixed tube (61), the second metal ball (63) movably arranged in the buffer cavity (512), the lower end of the second metal ball (63) fixedly connected to a first connecting rod (64), the lower end of the first connecting rod (64) fixedly connected to the bottom wall of the buffer cavity (512), wherein the M first impact balls (62) are divided into two groups, the two groups of the first impact balls (62) are symmetrically arranged about the vertical center line of the fixed tube (61), and M is a positive even number greater than or equal to 2.

2. The casing head device for oil and gas production according to claim 1, characterized in that: The cavity adjustment mechanism (5) further comprises a second guide and limit assembly (52) for driving the cavity adjustment plate assembly (51) to move radially along the through cavity (2); the two ends of the second guide and limit assembly (52) are respectively fixedly connected to the side wall of the cavity adjustment plate assembly (51) and the side wall of the through cavity (2); the second guide and limit assembly (52) comprises a second guide and limit rod (521), a second guide and limit cylinder (522) and a second guide and limit spring (523); the second guide and limit rod (521) is movably inserted in the second guide and limit cylinder (522); the second guide and limit spring (523) is wound around the outside of the second guide and limit rod (521); the two ends of the second guide and limit spring (523) are respectively fixedly connected to the side wall of the second guide and limit rod (521) and the outer wall of the second guide and limit cylinder (522).

3. The casing head device for oil and gas production according to claim 1, characterized in that: The cavity adjustment mechanism (5) further comprises a first driving structure, the first driving structure comprising a rotating shaft (53) fixedly arranged on the side wall of the cavity adjustment plate assembly (51), a threaded rod (54) being rotatably connected to the free end of the rotating shaft (53), the threaded rod (54) being threadedly inserted into a threaded hole (55), the threaded hole (55) being provided on the casing head body (1), and an end of the threaded rod (54) away from the rotating shaft (53) being fixedly connected to the adjustment plate (56).

4. The casing head device for oil and gas production according to claim 1, characterized in that: The buffer mechanism is a first guide limit assembly (515), the first guide limit assembly (515) comprising a first guide limit rod (5151), a first guide limit cylinder (5152) and a first guide limit spring (5153), the first guide limit rod (5151) being movably inserted in the first guide limit cylinder (5152), the first guide limit spring (5153) being wound around the outside of the first guide limit rod (5151), and the two ends of the first guide limit spring (5153) being respectively fixedly connected to the side wall of the first guide limit rod (5151) and the outer side wall of the first guide limit cylinder (5152).

5. The casing head device for oil and gas production according to claim 1, characterized in that: It also includes a snap-in tooth assembly (7), wherein a plurality of the snap-in tooth assemblies (7) are provided, and the plurality of the snap-in tooth assemblies (7) are divided into two groups, and the two groups of the snap-in tooth assemblies (7) are symmetrically arranged about the central axis of the push plate (514), and the snap-in tooth assembly (7) includes a snap-in tooth body (71) fixedly arranged on the lower end surface of the push plate (514), and a through hole (72) connected to the buffer hole cavity (512) is opened on the hole adjustment plate body (511), and the through hole (72) is matched with the snap-in tooth body (71).

6. The casing head device for oil and gas production according to claim 1, characterized in that: The invention also comprises a second driving structure (8), wherein the second driving structure (8) comprises a driving cylinder (81), wherein the driving cylinder (81) is fixedly arranged on the first supporting ring (82), wherein a second connecting rod (83) is fixedly connected to the inner side wall of the first supporting ring (82), wherein the free end of the second connecting rod (83) is fixedly connected to the side wall of the casing head body (1), wherein the driving end of the driving cylinder (81) is connected to a cylinder arm (84), wherein the free end of the cylinder arm (84) is fixedly connected to a supporting plate (85), wherein one end of the supporting plate (85) away from the cylinder arm (84) is fixedly connected to a sliding rod (86), wherein the sliding rod (86) is movably plugged into the casing head body (1), and one end of the sliding rod (86) away from the supporting plate (85) is fixedly connected to the side wall of the cavity adjustment plate assembly (51).

7. The casing head device for oil and gas production according to claim 6, characterized in that: The third driving structure (9) further comprises a driving motor (91), wherein the third driving structure (9) comprises a driving motor (91), a side wall of the driving motor (91) is fixedly connected to a third connecting rod (92), a free end of the third connecting rod (92) is fixedly connected to the side wall of the casing head body (1), a driving end of the driving motor (91) is connected to a fourth connecting rod (93), a first gear (94) is fixedly sleeved outside the fourth connecting rod (93), the first gear (94) and the second gear (95) are meshed with each other, the second gear (95) is fixedly sleeved outside a second supporting ring (96), a rear end of the second supporting ring (96) is fixedly connected to a third gear (98), and the third The gear (98) and the fourth gear (99) are meshed with each other. The fourth gear (99) is fixedly sleeved outside the inner spiral cylinder (910). The inner spiral cylinder (910) is rotatably arranged on the third support ring (911). A fifth connecting rod (97) is fixedly connected to the inner side wall of the third support ring (911). The free end of the fifth connecting rod (97) is fixedly connected to the casing head body (1). An outer spiral rod (913) is inserted into the inner thread of the inner spiral cylinder (910). The outer spiral rod (913) is movably inserted into the third support ring (911). One end of the outer spiral rod (913) located outside the inner spiral cylinder (910) is fixedly connected to the support plate (85).

8. The casing head device for oil and gas production according to claim 7, characterized in that: The third driving structure (9) further comprises a support assembly (914), wherein a plurality of the support assemblies (914) are provided, and the plurality of the support assemblies (914) are arranged in an equidistant ring shape on the second support ring (96), wherein the support assembly (914) comprises a sixth connecting rod (9141), wherein one end of the sixth connecting rod (9141) is fixedly connected to the side wall of the casing head body (1), and the other end of the sixth connecting rod (9141) is fixedly connected to a U-shaped support plate (9142), wherein the U-shaped support plate (9142) is buckled onto the outside of the second support ring (96), and support sliders (9143) are fixedly provided on the inner top wall and the inner bottom wall of the second support ring (96), and the support sliders (9143) are slidably provided in an annular groove (9144), and the two annular grooves (9144) are respectively provided on the upper end surface and the lower end surface of the second support ring (96).

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