Hydraulic control casing head hanger system

Abstract

The utility model discloses a hydraulic control casing head hanger system, and belongs to the technical field of oil and gas drilling well head devices. A hydraulic control casing head hanger system comprises a casing head and a hanger, a plurality of liquid injection cavities are formed in the casing head in the radial direction, sealing pieces are arranged in the liquid injection cavities in a sliding mode, the sealing pieces divide the liquid injection cavities into inner hydraulic cavities and outer hydraulic cavities, and the inner hydraulic cavities and the outer hydraulic cavities are connected with external hydraulic equipment through inner cavity flow channels and outer cavity flow channels respectively; a jackscrew is fixedly connected to the sealing piece, the size of the jackscrew is smaller than that of the sealing piece, and the jackscrew penetrates through the liquid injection cavity and is in sliding connection with the casing head. According to the device, the jackscrews are hydraulically driven, so that the hanger is fixed, and the problems that the efficiency is low and the pre-tightening force consistency of the jackscrews is poor due to an existing manual fixing mode can be solved.

Description

Technical Field

[0001] This application relates to the field of oil and gas drilling wellhead equipment technology, and more specifically, to a hydraulically controlled casing head hanger system. Background Technology

[0002] In oil and gas drilling operations, the casing head hanger is a core component of the wellhead assembly. Its function is to suspend each layer of casing inside the wellhead shell, achieving interlayer sealing and pressure isolation. The precise positioning and reliable retention of the hanger directly affect the integrity of the wellhead, drilling safety, and the smooth progress of subsequent production operations. With the development of deepwater, ultra-deepwater, and high-pressure, high-temperature oil and gas fields, higher requirements are placed on the automation level, operational precision, and safety monitoring of wellhead assemblies.

[0003] A search revealed that Chinese patent CN115613993A discloses an anti-wear wellhead tubing head device. This device extends the lower end of the tubing hanger to below the interfaces on both sides of the four-way body, and covers the corresponding positions on the outer wall of the tubing hanger with an anti-wear layer. This prevents the fracturing fluid from directly scouring the tubing hanger when it enters the central main diameter from the interfaces on both sides of the four-way body, thus avoiding wear on the tubing hanger, reducing the scouring effect on the tubing, reducing tubing wear, and extending the service life of the tubing hanger and the tubing.

[0004] Similar to conventional technical solutions, the above-mentioned solutions use set screws to lock the hanger. However, there are many set screws, and manual tightening and unwinding are cumbersome. Therefore, we propose a hydraulically controlled casing head hanger system. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] The purpose of this application is to provide a hydraulically controlled casing head hanger system to solve the problems mentioned in the background art.

[0007] 2. Technical Solution

[0008] This application is achieved through the following technical solution:

[0009] A hydraulically controlled casing head hanger system includes a casing head and a hanger. The casing head has multiple injection chambers radially arranged. A sealing element is slidably disposed within each injection chamber, dividing the injection chamber into an inner hydraulic chamber and an outer hydraulic chamber. The inner and outer hydraulic chambers are respectively connected to external hydraulic equipment through an inner flow channel and an outer flow channel. A set screw is fixedly connected to the sealing element. The set screw is smaller than the sealing element, passes through the injection chamber, and is slidably connected to the casing head.

[0010] As an optional solution to the technical solution of this application, the inner cavity flow channel is formed on the set wire.

[0011] As an optional solution to the technical solution of this application, the injection chamber has an opening on the outer wall of the sleeve head, and a pressure cap is provided in the opening. The pressure cap is detachably connected to the sleeve head, and the set screw slides through the pressure cap. The pressure cap and the sealing element are located at the two ends of the outer hydraulic chamber, respectively.

[0012] As an optional solution to the technical solution of this application, the external cavity flow channel is formed on the pressure cap.

[0013] As an optional solution to the technical solution in this application, the pressure cap is threadedly connected to the sleeve head.

[0014] As an optional solution to the technical solution of this application, the inner wall of the sleeve head is provided with a first contact and a second contact, and the outside of the hanger is provided with a shorting member, which is used to short-circuit the first contact and the second contact.

[0015] As an optional solution to the technical solution in this application, a power supply and an indicator light are connected in series between the first contact and the second contact.

[0016] As an optional solution to the technical solution of this application, the sleeve head is provided with an inwardly protruding protrusion, and the first contact and the second contact are disposed on the surface of the protrusion.

[0017] As an optional solution to the technical solution of this application, a sealing ring is provided at the connection between the set screw and the sleeve head and the pressure cap, and a sealing ring is provided at the connection between the sealing element and the inner wall of the injection chamber.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] 1) This application solves the problems of low efficiency and poor consistency of preload of each set screw by using hydraulically driven set screws to fix the hanger.

[0021] 2) This application sets a contact inside the sleeve head and a shorting device on the hanger, which can determine whether the hanger is in the correct position by detecting the circuit connection between the two contacts. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a hydraulically controlled casing head hanger system;

[0023] Figure 2This is a schematic diagram of the injection chamber structure of a hydraulically controlled casing head hanger system;

[0024] In the diagram: 1. Sleeve head; 101. Injection chamber; 1011. Inner hydraulic chamber; 1012. Outer hydraulic chamber; 102. First contact; 103. Second contact; 104. Protrusion; 2. Hanger; 201. Short connector; 3. Seal; 4. Set screw; 401. Inner cavity flow channel; 5. Pressure cap; 501. Outer cavity flow channel. Detailed Implementation

[0025] The technical solution of this application will now be clearly and completely described in conjunction with the accompanying drawings.

[0026] Please see Figure 1 and Figure 2 This application provides a hydraulically controlled casing head hanger system, including a casing head 1 and a hanger 2. The casing head 1 has multiple injection chambers 101 radially. A sealing element 3 is slidably disposed in the injection chamber 101. The sealing element 3 divides the injection chamber 101 into an inner hydraulic chamber 1011 and an outer hydraulic chamber 1012. The inner hydraulic chamber 1011 and the outer hydraulic chamber 1012 are respectively connected to external hydraulic equipment through an inner cavity flow channel 401 and an outer cavity flow channel 501. A set screw 4 is fixedly connected to the sealing element 3. The size of the set screw 4 is smaller than that of the sealing element 3. The set screw 4 passes through the injection chamber 101 and is slidably connected to the casing head 1.

[0027] In this design, multiple injection chambers 101 are arranged in a ring with equal spacing on the sleeve head 1. When the hanger 2 needs to be installed, it is first lowered to the designated position inside the sleeve head 1. Hydraulic oil is then injected into the outer hydraulic chamber 1012 via an external hydraulic device. The sealing element 3 pushes the set screw 4 into the sleeve head 1 until it abuts against the hanger 2. Furthermore, a displacement sensor can be installed on the set screw 4 to acquire its displacement information. This displacement information ensures that the set screw 4 can move into position, thus reliably fixing the hanger 2.

[0028] When it is necessary to disassemble the hanger 2, hydraulic oil is injected into the inner hydraulic chamber 1011 through an external hydraulic device, and the set screw 4 is pushed to move outward of the sleeve head 1 through the seal 3, so that the set screw 4 is disengaged from the hanger 2, and the hanger 2 can be removed from the sleeve head 1.

[0029] As a preferred embodiment of this application, the inner cavity flow channel 401 is formed on the set screw 4, the injection cavity 101 has an opening on the outer wall of the sleeve head 1, and a pressure cap 5 is provided in the opening. The pressure cap 5 is detachably connected to the sleeve head 1. Preferably, the pressure cap 5 is threadedly connected to the sleeve head 1, and the set screw 4 slides through the pressure cap 5. The pressure cap 5 and the sealing element 3 are respectively located at both ends of the outer hydraulic cavity 1012, and the outer cavity flow channel 501 is formed on the pressure cap 5.

[0030] In a preferred embodiment of this application, the inner wall of the sleeve head 1 is provided with a first contact 102 and a second contact 103, and the outside of the hanger 2 is provided with a shorting member 201, which is used to short-circuit the first contact 102 and the second contact 103. After the hanger 2 is lowered into place, the shorting member 201 can connect to the first contact 102 and the second contact 103 simultaneously to realize the circuit conduction, and the hanger 2 can be judged to be lowered into place based on this signal.

[0031] In a preferred embodiment of this application, a power supply and an indicator light are connected in series between the first contact 102 and the second contact 103. After the hanger 2 is lowered into place and the circuit is turned on, the indicator light can illuminate under the power supply to lift the worker.

[0032] In a preferred embodiment of this application, the sleeve head 1 has an inwardly protruding protrusion 104 inside, the upper surface of the protrusion 104 is inclined at 45 degrees, and the first contact 102 and the second contact 103 are disposed on the surface of the protrusion 104. The protrusion 104 can limit the suspension 2 and transfer the load on the suspension 2 to the sleeve head 1.

[0033] As a preferred embodiment of this application, a sealing ring is provided at the connection between the set screw 4 and the sleeve head 1 and the pressure cap 5, and a sealing ring is provided at the connection between the sealing element 3 and the inner wall of the injection chamber 101, in order to increase the sealing performance between the inner hydraulic chamber 1011 and the outer hydraulic chamber 1012 and prevent hydraulic oil leakage.

[0034] In addition, a laser sensor can be installed on the upper surface of the suspension device 2. As the suspension device 2 is gradually lowered from the top of the wellhead to the bottom, the distance collected by the laser sensor will gradually increase due to the increasing distance. The distance digital signal can be converted into an electrical signal and remotely connected to the cylindrical light strip on the well site monitoring platform. As the suspension device 2 is lowered, the light strip also lights up from top to bottom to obtain the position information of the suspension device 2.

Claims

1. A hydraulically controlled casing head suspension system, characterized in that: The device includes a sleeve head (1) and a hanger (2). The sleeve head (1) has multiple injection chambers (101) in the radial direction. A sealing element (3) is slidably provided in the injection chamber (101). The sealing element (3) divides the injection chamber (101) into an inner hydraulic chamber (1011) and an outer hydraulic chamber (1012). The inner hydraulic chamber (1011) and the outer hydraulic chamber (1012) are respectively connected to external hydraulic equipment through an inner cavity flow channel (401) and an outer cavity flow channel (501). A set screw (4) is fixedly connected to the sealing element (3). The size of the set screw (4) is smaller than that of the sealing element (3). The set screw (4) passes through the injection chamber (101) and is slidably connected to the sleeve head (1).

2. The hydraulically controlled casing head suspension system according to claim 1, characterized in that: The inner cavity flow channel (401) is formed on the top wire (4).

3. The hydraulically controlled casing head suspension system according to claim 1, characterized in that: The injection chamber (101) has an opening on the outer wall of the sleeve head (1), and a pressure cap (5) is provided in the opening. The pressure cap (5) is detachably connected to the sleeve head (1). The set screw (4) slides through the pressure cap (5). The pressure cap (5) and the sealing element (3) are located at the two ends of the outer hydraulic chamber (1012).

4. The hydraulically controlled casing head suspension system according to claim 3, characterized in that: The external cavity flow channel (501) is opened on the pressure cap (5).

5. A hydraulically controlled casing head suspension system according to claim 3, characterized in that: The pressure cap (5) is threadedly connected to the sleeve head (1).

6. The hydraulically controlled casing head suspension system according to claim 1, characterized in that: The inner wall of the sleeve head (1) is provided with a first contact (102) and a second contact (103), and the outside of the hanger (2) is provided with a shorting member (201), which is used to short-circuit the first contact (102) and the second contact (103).

7. A hydraulically controlled casing head suspension system according to claim 6, characterized in that: A power supply and an indicator light are connected in series between the first contact (102) and the second contact (103).

8. A hydraulically controlled casing head suspension system according to claim 6, characterized in that: The sleeve head (1) has an inwardly protruding protrusion (104) inside, and the first contact (102) and the second contact (103) are disposed on the surface of the protrusion (104).

9. A hydraulically controlled casing head suspension system according to claim 3, characterized in that: The connection between the set screw (4) and the sleeve head (1) and the pressure cap (5) is provided with a sealing ring, and the connection between the sealing element (3) and the inner wall of the injection chamber (101) is provided with a sealing ring.

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