Wellhead casing head device

Abstract

The invention discloses a wellhead casing head device, which relates to the technical field of oil well facilities, including a transition flange for connecting with an oil production tree, the transition flange is connected with the casing head, and the center lines of the inner holes of the two coincide, the upper part of the center hole of the casing head cooperates with a hanger, and the two ends of the center hole of the hanger are threadedly connected to the oil casing, and a through hole penetrating the center hole of the transition flange is provided on the side wall of the transition flange, and a sealing component 1 is provided on the outer opening of the through hole; a transition hole for optical fiber to pass through is provided on the side wall of the hanger, and the upper end of the transition hole faces the center hole of the transition flange, and the lower end faces the center hole of the casing head, and a sealing component 2 is provided on the opening of the transition hole. The optical fiber is fed into the through hole of the transition flange, surrounds the oil casing, and then extends from the transition hole of the hanger; at the same time, the sealing component 1 is used to realize the sealing of the optical fiber and the through hole, and the sealing component 2 is used to realize the sealing of the optical fiber and the transition hole, so that the hanger and the optical fiber do not interfere with each other, and the optical fiber is prevented from bending, thereby extending its service life.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum well facilities, in particular to a wellhead casing head device. Background Art

[0002] Casing head products are the wellhead guarantee conditions that must be provided in oil and gas well drilling, production and transportation operations. They mainly meet the need to install a wellhead blowout preventer group to prevent "blowouts" during drilling operations, as well as provide effective wellhead connections for production and transportation operations, and provide a safe, efficient and convenient way to connect the ground and underground for multiple engineering operations. In order to observe the downhole conditions of the oil well at any time after completion, the oil casing head hanger needs to use optical fiber to realize downhole video acquisition, and the optical fiber must not affect the performance of the hanger itself. However, the optical fiber arrangement in the existing technology has technical defects, and it is impossible to achieve non-interference with the hanger, and there is also a safety hazard of damaging the optical fiber during the operation of subsequent tools and equipment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a wellhead casing head device in view of the above-mentioned deficiencies in the prior art, which can effectively improve the operating reliability of the optical fiber and ensure the stable performance of the oil casing head hanger.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A wellhead casing head device comprises a transition flange for connecting with an oil production tree, wherein the transition flange is connected with the casing head by bolts, the center lines of the inner holes of the transition flange and the casing head coincide with each other, the upper part of the center hole of the casing head cooperates with a hanger, the two ends of the center hole of the hanger are threadedly connected with oil casing, and the oil casing at both ends extends into the center holes of the casing head and the transition flange; a through hole for passing an optical fiber is provided on the side wall of the transition flange, the through hole is connected with the center hole of the transition flange, and a sealing component 1 for sealing the optical fiber is provided at the outer opening of the through hole; a transition hole for passing an optical fiber is provided on the side wall of the hanger, the upper end of the transition hole faces the center hole of the transition flange, and the lower end faces the center hole of the casing head, and a sealing component 2 for sealing the optical fiber is provided at the opening of the transition hole; the optical fiber surrounds the outside of the oil casing at the upper end opening of the hanger, one end of the optical fiber passes through the through hole of the side wall of the transition flange and extends to the outside of the transition flange, and the other end of the optical fiber passes through the transition hole of the side wall of the hanger and extends downward along the center hole of the casing head.

[0006] Preferably, the transition hole is parallel to the center hole of the hanger, and the second sealing component is arranged at the upper end opening of the transition hole.

[0007] Preferably, the sealing component 1 includes a pressure cap, two first metal washers and several first rubber sealing rings, the two first metal washers and the several first rubber sealing rings have the same outer diameter, and the middle part of the pressure cap is provided with a through hole that fits tightly with the optical fiber; the middle part of the through hole is provided with a threaded hole that fits with the pressure cap and a blind hole that fits with the first metal washers, and the diameters of the threaded hole and the blind hole are both larger than the diameter of the through hole; and the several first rubber sealing rings are arranged in parallel between the two first metal washers.

[0008] Preferably, the minor diameter of the threaded hole of the through hole opening is larger than the diameter of the blind hole matched with the first metal washer, and the diameter of the middle through hole of the pressure cap is smaller than the outer diameter of the first metal washer.

[0009] Preferably, the second sealing component includes a clamping screw, two second metal washers and a plurality of second rubber sealing rings, the two second metal washers and the plurality of second rubber sealing rings have the same outer diameter, and the middle part of each of the two second metal washers is provided with a through hole that tightly fits the optical fiber, and the middle part of the clamping screw is provided with a through hole that loosely fits the optical fiber; the upper end opening of the transition hole is provided with a threaded hole that fits the clamping screw and a blind hole that fits the second metal washers, and the diameters of the threaded hole and the blind hole are both larger than the diameter of the transition hole; and the plurality of second rubber sealing rings are arranged in parallel between the two second metal washers.

[0010] Preferably, a countersunk hole for applying torque to the clamping screw is provided on the top of the clamping screw, and the minor diameter of the threaded hole of the transition hole opening is larger than the major diameter of the blind hole with the second metal washer.

[0011] Preferably, it also includes a locking piece that cooperates with the clamping screw, and the middle part of the locking piece is provided with an optical hole that cooperates with the optical fiber along its length direction; the two ends of the locking piece respectively cooperate with the clamping screw and the wrench to apply torque to the clamping screw.

[0012] Preferably, it also includes a locking piece that cooperates with the clamping screw, one end of the locking piece that cooperates with the clamping screw is a straight-shaped force-applying portion, the top of the clamping screw is a straight-shaped countersunk hole that cooperates with it, and the other end of the locking piece is a square portion that cooperates with a wrench.

[0013] The beneficial effects of the above technical solution are as follows: compared with the prior art, the present invention provides a through hole and a transition hole in the side wall of the transition flange and the hanger, and the optical fiber is fed into the through hole of the transition flange, wrapped around the oil casing, and then extended from the transition hole of the hanger, thereby avoiding bending of the optical fiber; at the same time, the sealing component 1 is used to seal the optical fiber and the through hole, and the sealing component 2 is used to seal the optical fiber and the transition hole. The present invention can achieve non-interference between the hanger and the optical fiber, ensure the safe operation of the optical fiber, and thus extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a wellhead casing head device provided by an embodiment of the present invention;

[0015] Figure 2 yes Figure 1 AA section view in;

[0016] Figure 3 yes Figure 1 A partial enlarged view of the middle sealing component 1;

[0017] Figure 4 yes Figure 1 A partial enlarged view of the middle sealing component 2;

[0018] Figure 5 is a schematic structural diagram of a locking member in one embodiment of the present invention;

[0019] In the figure: 1-transition flange, 2-casing head, 3-hanger, 4-oil casing, 5-optical fiber, 6-through hole, 7-sealing component one, 8-transition hole, 9-sealing component two, 10-locking piece, 11-light hole, 12-sealing gasket; 100-force-applying part, 101-square part; 71-pressure cap, 72-first metal gasket, 73-first rubber sealing ring; 91-pressing screw, 92-second metal gasket, 93-second rubber sealing ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] like Figure 1 , 2As shown, a wellhead casing head device provided by the present invention includes a transition flange 1 for connecting to an oil production tree, wherein the transition flange 1 is connected to the casing head 2 by bolts, the center lines of the inner holes of the transition flange 1 and the casing head 2 coincide with each other, the upper part of the center hole of the casing head 2 cooperates with the hanger 3, and at the same time, the upper end surface of the hanger 3 is sealed with the lower end surface of the transition flange 1 through a sealing gasket 12; the two ends of the center hole of the hanger 3 are threadedly connected to the oil casing 4, and the oil casing 4 at both ends extend into the center holes of the casing head 2 and the transition flange 1; a through hole 6 for the optical fiber 5 to pass through is provided on the side wall of the transition flange 1, and the through hole 6 is connected to the transition flange 1 is through-hole, and the outer opening of the through hole 6 is provided with a sealing component 1 7 for sealing the optical fiber 5; the side wall of the hanger 3 is provided with a transition hole 8 for the optical fiber 5 to pass through, the upper end of the transition hole 8 faces the center hole of the transition flange 1, and the lower end faces the center hole of the casing head 2, and the opening of the transition hole 1 is provided with a sealing component 2 9 for sealing the optical fiber 5; the optical fiber 5 is surrounded by the outer wall of the oil casing 4 at the upper opening of the hanger 3, one end of the optical fiber 5 passes through the through hole 6 of the side wall of the transition flange 1 and extends to the outside of the transition flange 1, and the other end of the optical fiber 5 passes through the transition hole 8 of the side wall of the hanger 3 and extends downward along the center hole of the casing head 2. The optical fiber is fed into the through hole of the transition flange, surrounds the oil casing, and then extends out of the transition hole of the hanger; at the same time, the sealing component 1 is used to realize the sealing of the optical fiber and the through hole, and the sealing component 2 is used to realize the sealing of the optical fiber and the transition hole, so as to realize the non-interference between the hanger and the optical fiber, avoid bending of the optical fiber, and also avoid interference of subsequent tools and equipment on the optical fiber during the working process, and avoid the phenomenon of damaging the optical fiber.

[0022] In a preferred embodiment of the present invention, Figure 1 As shown, the transition hole 8 is parallel to the central hole of the hanger 3, and the sealing component 9 is arranged at the upper end opening of the transition hole 8. This structure is convenient for processing and manufacturing, and also convenient for the installation and sealing operation of the optical fiber.

[0023] In a specific embodiment of the present invention, Figure 2 , 3As shown, the sealing assembly 7 includes a pressure cap 71, two first metal washers 72 and a plurality of first rubber seals 73. The two first metal washers 72 and the plurality of first rubber seals 73 have the same outer diameter and are provided with through holes in the middle thereof to fit tightly with the optical fiber 5. The middle of the pressure cap 71 is provided with a through hole to fit with the optical fiber 5. The opening of the through hole 6 is provided with a threaded hole to fit with the pressure cap 71 and a blind hole to fit with the first metal washers 72. The threaded hole and the blind hole have diameters greater than the diameter of the through hole 6. The plurality of first rubber seals 73 are arranged in parallel between the two first metal washers 72. The outer circle of the first rubber seal is in tight fit with the through hole. The plurality of first rubber seals are sleeved on the optical fiber to achieve sealing of the optical fiber in the through hole. The plurality of first rubber seals are protected by the two first metal washers to prevent the first rubber seals from shifting during the operation of the optical fiber. Finally, the pressure cap is used to press and fix the first metal washers and the first rubber seals, thereby achieving sealing and fixing of the optical fiber in the through hole.

[0024] Further optimize the above technical solution, such as Figure 3 As shown, the minor diameter of the threaded hole at the opening of the through hole 6 is larger than the blind hole diameter matched with the first metal washer 72, and the diameter of the middle through hole of the pressure cap 71 is smaller than the outer diameter of the first metal washer 72. This structure can ensure that the pressure cap presses the first metal washer tightly; at the same time, the middle through hole of the pressure cap is larger than the outer diameter of the optical fiber, which facilitates the optical fiber to freely pass through the pressure cap.

[0025] In a specific embodiment of the present invention, Figure 4 As shown, the sealing assembly 2 9 includes a clamping screw 91, two second metal washers 92 and a plurality of second rubber seals 93. The two second metal washers 92 and the plurality of second rubber seals 93 have the same outer diameter and are provided with through holes in the middle thereof to tightly fit with the optical fiber 5. The middle of the clamping screw 91 is provided with a through hole to loosely fit with the optical fiber 5. The upper end opening of the transition hole 8 is provided with a threaded hole to fit with the clamping screw 91 and a blind hole to fit with the second metal washers 92. The threaded hole and the blind hole have diameters greater than the diameter of the transition hole 8. The plurality of second rubber seals 93 are arranged in parallel between the two second metal washers 92. The outer circle of the second rubber seal is tightly fitted with the transition hole. The plurality of second rubber seals are sleeved on the optical fiber to achieve the sealing effect on the optical fiber. The two second metal washers protect the plurality of second rubber seals to prevent the second rubber seals from shifting during the operation of the optical fiber. Finally, the second metal washers and the second rubber seals are pressed and fixed by the clamping screw, thereby achieving the sealing and fixing of the optical fiber in the transition hole.

[0026] In a preferred embodiment of the present invention, Figure 4As shown, a countersunk hole 910 for applying torque to the clamping screw 91 is provided at the top of the clamping screw 91 , and the threaded hole minor diameter of the transition hole 8 is larger than the blind hole major diameter of the second metal washer 92 .

[0027] In a preferred embodiment of the present invention, a locking member 10 is further included which cooperates with the clamping screw 91. The middle part of the locking member 10 is provided with an optical hole 11 which cooperates with the optical fiber 5 along its length direction. The two ends of the locking member 10 cooperate with the clamping screw 91 and the wrench respectively, and are used to apply torque to the clamping screw 91. Among them, one end of the locking member 10 which cooperates with the clamping screw 91 is a straight-shaped force-applying portion 100, the top of the clamping screw 91 is a straight-shaped countersunk hole which cooperates with it, and the other end of the locking member 10 is a square portion 101 which cooperates with the wrench. The torque is applied by the square portion of the wrench and the locking member, and the torque is transmitted to the clamping screw through the straight-shaped force-applying portion of the locking member, thereby realizing the locking and fixing of the second metal washer.

[0028] After testing, it was found that both the device with a transition hole opened at the upper end of the hanger to install the sealing component 2 and the device with a through hole opened in the transition flange and the sealing component 1 installed can withstand a pressure of 35MPa, achieving the purpose of passing the optical fiber through the hanger for logging without affecting the performance of the hanger itself.

[0029] During the application of the present invention, a through hole is provided on the side wall of the transition flange to provide an outlet for the optical fiber, seal the optical fiber and carry the Christmas tree, and the optical fiber is wrapped around the outer wall of the oil casing through the oil casing threadedly tightened with the hanger to achieve a smooth transition, thereby preventing the optical fiber from being bent. The optical fiber passes through the outer wall of the oil casing, the inner hole of the oil casing and other operations performed by the hanger without causing damage to the optical fiber. The present invention does not affect the performance of the hanger, and subsequent tools and equipment will not interfere with the optical fiber, thereby avoiding the phenomenon of damaging the optical fiber.

[0030] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A wellhead casing head device, characterized in that: It comprises a transition flange for connecting with an oil production tree, the transition flange is connected with a casing head by bolts, the center lines of the inner holes of the transition flange and the casing head coincide with each other, the upper part of the center hole of the casing head cooperates with a hanger, the two ends of the center hole of the hanger are threadedly connected with oil casing, and the oil casing at both ends extends into the center holes of the casing head and the transition flange; a through hole for passing the optical fiber is provided on the side wall of the transition flange, the through hole is connected with the center hole of the transition flange, and a sealing component for sealing the optical fiber is provided on the outer opening of the through hole; the side wall of the hanger is provided with A transition hole for the optical fiber to pass through, the upper end of the transition hole faces the center hole of the transition flange, and the lower end faces the center hole of the casing head. The opening of the transition hole is provided with a sealing component 2 for sealing the optical fiber; the optical fiber surrounds the outside of the oil casing at the upper opening of the hanger, one end of the optical fiber passes through the through hole of the side wall of the transition flange and extends to the outside of the transition flange, and the other end of the optical fiber passes through the transition hole of the side wall of the hanger and extends downward along the center hole of the casing head; the transition hole is parallel to the center hole of the hanger, and the sealing component 2 is arranged at the upper opening of the transition hole; The sealing component 1 includes a pressure cap, two first metal washers and a plurality of first rubber sealing rings. The two first metal washers and the plurality of first rubber sealing rings have the same outer diameter and are provided with through holes in the middle thereof that are tightly matched with the optical fiber. The middle portion of the pressure cap is provided with a through hole that is loosely matched with the optical fiber. The through hole opening is provided with a threaded hole that is matched with the pressure cap and a blind hole that is matched with the first metal washers. The diameters of the threaded hole and the blind hole are both larger than the diameter of the through hole. The plurality of first rubber sealing rings are arranged in parallel between the two first metal washers.

2. The wellhead casing head device according to claim 1, characterized in that: The minor diameter of the threaded hole of the through hole opening is larger than the diameter of the blind hole matched with the first metal washer, and the diameter of the middle through hole of the pressure cap is smaller than the outer diameter of the first metal washer.

3. The wellhead casing head device according to claim 1 or 2, characterized in that: The second sealing component includes a clamping screw, two second metal washers and a plurality of second rubber sealing rings. The two second metal washers and the plurality of second rubber sealing rings have the same outer diameter and are provided with through holes in the middle thereof that are tightly matched with the optical fiber. The middle portion of the clamping screw is provided with a through hole that is loosely matched with the optical fiber. The upper end opening of the transition hole is provided with a threaded hole that is matched with the clamping screw and a blind hole that is matched with the second metal washers. The diameters of the threaded hole and the blind hole are both larger than the diameter of the transition hole. The plurality of second rubber sealing rings are arranged in parallel between the two second metal washers.

4. The wellhead casing head device according to claim 3, characterized in that: A countersunk hole for applying torque to the clamping screw is provided on the top of the clamping screw, and the threaded hole minor diameter of the transition hole opening is larger than the blind hole major diameter of the second metal washer.

5. The wellhead casing head device according to claim 3, characterized in that: It also includes a locking piece that cooperates with the clamping screw, and a light hole that cooperates with the optical fiber is provided in the middle of the locking piece along its length direction; the two ends of the locking piece respectively cooperate with the clamping screw and the wrench to apply torque to the clamping screw.

6. The wellhead casing head device according to claim 4, characterized in that: It also includes a locking piece that cooperates with the clamping screw, one end of the locking piece that cooperates with the clamping screw is a straight-shaped force-applying portion, the top of the clamping screw is a straight-shaped countersunk hole that cooperates with it, and the other end of the locking piece is a square portion that cooperates with a wrench.

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