Wellhead gas collection sealing device of seismic fluid observation well

Abstract

The utility model relates to an earthquake fluid observation well mouth gas collection sealing device, and belongs to the technical field of earthquake monitoring. The device mainly comprises a lower connecting flange, an annular sealing block, an upper connecting flange, a sealing ring, a plugging block, a sealing rubber ring, a communicating pipe, an air outlet pipe, a sealing plug, a sealing ring and a cable. The annular sealing block is arranged between the lower connecting flange and the observation well wall, the lower abutting bolt abuts against the annular sealing block, sealing at the position is enhanced, the sealing ring is arranged between the upper connecting flange and the lower connecting flange, the sealing rubber rings are installed at the connecting positions of the plugging block, the upper connecting flange and the inner well wall of the observation well, and the upper abutting bolt abuts against the sealing rubber rings. Sealing is guaranteed from multiple parts, the possibility of gas leakage in the observation well is reduced, the connecting positions of the round holes and the cables are coated with sealant, gas can be effectively prevented from leaking from cable channels, the situation that the sealing performance of the whole device is affected is avoided, meanwhile, normal work of the cables can be protected, and connectivity between the cables and underground equipment is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of earthquake monitoring technology, specifically relating to a wellhead gas collection and sealing device for earthquake fluid observation wells. Background Technology

[0002] Seismic fluid observation wells are important facilities for monitoring seismic activity. They can obtain earthquake precursor information by measuring the physical and chemical properties of underground fluids. In seismic fluid observation wells, the wellhead gas collection and sealing device is a very critical component. Its main function is to prevent gas leakage inside the observation well and ensure the accuracy and reliability of gas collection.

[0003] However, existing wellhead gas collection sealing devices have some problems in practical applications, mainly manifested in unreasonable sealing structure design, poor sealing effect, easy leakage of gas inside the observation well, and affecting the accuracy and reliability of gas collection. Utility Model Content

[0004] To overcome the problems of unreasonable sealing structure design and poor sealing effect of existing sealing devices, this utility model provides a gas collection sealing device for the wellhead of a seismic fluid observation well. An annular sealing block is set between the lower connecting flange and the observation well wall, and is tightened by a lower clamping bolt to enhance the seal at this point. A sealing ring is set between the upper and lower connecting flanges. Sealing rubber rings are installed at the connection points between the sealing block and the upper connecting flange and the inner wall of the observation well, and are tightened by an upper clamping bolt to ensure the seal from multiple points, reducing the possibility of gas leakage inside the observation well. The connection point between the round hole and the cable is coated with sealant, which can effectively prevent gas from leaking from the cable channel, avoid affecting the overall sealing performance of the device, and also protect the normal operation of the cable, ensuring the connectivity with the downhole equipment.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A wellhead gas collection and sealing device for seismic fluid observation wells mainly includes a lower connecting flange, an annular sealing block, an upper connecting flange, a sealing ring, a sealing block, a sealing rubber ring, a connecting pipe, an outlet pipe, a sealing plug, a sealing ring, and a cable. The lower connecting flange has a threaded hole, through which fastening bolts pass to install the lower connecting flange onto the well wall. The annular sealing block is installed between the lower connecting flange and the outer well wall of the observation well, fitting tightly against both. A lower clamping bolt is provided on the lower connecting flange to abut the annular sealing block. The upper connecting flange is installed on the top of the lower connecting flange by fastening bolts. An installation groove is provided on the flange, and the sealing ring is installed in the installation groove. The sealing block is installed on the upper connecting flange, located at the top of the observation well opening. Sealing rings are installed at the connection between the upper connecting flange and the sealing block, and at the connection between the inner wall of the observation well and the sealing block. The upper connecting flange is provided with an upper tightening bolt for abutting the sealing ring at the connection between the sealing block and the upper connecting flange. The connecting pipe and the vent pipe are installed on the top of the sealing block and are connected to the observation well. The sealing plug is installed on the connecting pipe and the vent pipe. Sealing rings are installed at the connection between the connecting pipe and the sealing plug, and at the connection between the vent pipe and the sealing plug. The sealing plug on the connecting pipe has a round hole, through which the cable extends into the observation well. Sealing glue is applied between the connection between the cable and the round hole.

[0006] Both the lower and upper clamping bolts are equipped with flexible sealing blocks at their ends.

[0007] The annular sealing block is made of copper alloy material with high strength and wear resistance, suitable for high temperature, high pressure and corrosive environments.

[0008] The sealing ring is made of rubber material with good elasticity and adaptability, which can adapt to a certain degree of wellhead deformation in the observation well.

[0009] The beneficial effects of this utility model are:

[0010] This device effectively solves the problems of unreasonable sealing structure design and poor sealing effect of existing sealing devices through the design of multiple sealing structures. An annular sealing block is set between the lower connecting flange and the observation well wall, and is tightened by a lower clamping bolt to enhance the seal at this point. A sealing ring is set between the upper and lower connecting flanges. Sealing rubber rings are installed at the connection points between the sealing block and the upper connecting flange and the inner wall of the observation well, and are tightened by an upper clamping bolt. Sealing is ensured from multiple points, reducing the possibility of gas leakage inside the observation well. This allows for accurate collection of unleashed original gas inside the observation well during gas collection. The connection between the round hole and the cable is coated with sealant, which can effectively prevent gas from leaking from the cable channel, avoiding affecting the overall sealing performance of the device. At the same time, it can also protect the cable and ensure the normal operation of the cable and ensure the connectivity with the downhole equipment. Attached Figure Description

[0011] Figure 1 This is an isometric schematic diagram of the present invention.

[0012] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0013] Figure 3 This is a schematic diagram of the structure of this utility model viewed from below.

[0014] Figure 4 This is a partial cross-sectional view of the present invention.

[0015] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0016] Figure 6 yes Figure 4 A magnified view of a section at point B. Detailed Implementation

[0017] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0018] This utility model discloses a wellhead gas collection and sealing device for seismic fluid observation wells. The device mainly includes a lower connecting flange 1, an annular sealing block 2, an upper connecting flange 3, a sealing ring 4, a plugging block 5, a sealing rubber ring 6, a connecting pipe 7, an outlet pipe 8, a sealing plug 9, a sealing ring 10, and a cable 11. The lower connecting flange 1 has a threaded hole 13, through which a fastening bolt passes to install the lower connecting flange 1 onto the well wall of the observation well 12. The annular sealing block 2 is installed between the lower connecting flange 1 and the outer well wall of the observation well 12, fitting tightly against both. The lower connecting flange 1 is provided with a lower clamping bolt 14 for abutting the annular sealing block 2. The upper connecting flange 3 is installed on the top of the lower connecting flange 1 by a fastening bolt. Installation points are provided on both the lower connecting flange 1 and the upper connecting flange 3. The mounting groove 31 is used to install the sealing ring 4. The sealing block 5 is installed on the upper connecting flange 3 and located at the top of the wellhead of the observation well 12. Sealing rings 6 are installed at the connection between the upper connecting flange 3 and the sealing block 5, and at the connection between the inner wall of the observation well 12 and the sealing block 5. The upper connecting flange 3 is provided with an upper tightening bolt 32 for abutting the sealing ring 6 at the connection between the sealing block 5 and the upper connecting flange 3. The connecting pipe 7 and the air outlet pipe 8 are installed at the top of the sealing block 5 and are connected to the observation well 12. The sealing plug 9 is installed on the connecting pipe 7 and the air outlet pipe 8. Sealing rings 10 are installed at the connection between the connecting pipe 7 and the sealing plug 9, and at the connection between the air outlet pipe 8 and the sealing plug 9. The sealing plug 9 on the connecting pipe 7 has a round hole 91. The cable 11 extends through the round hole 91 into the interior of the observation well 12. The connection between the cable 11 and the round hole 91 is coated with sealant.

[0019] The lower connecting flange 1 is fixed to the well wall of the observation well 12 using fastening bolts and threaded holes 13, ensuring that the lower connecting flange 1 is firmly installed and tightly fitted to the well wall of the observation well 12. An annular sealing block 2 is placed between the lower connecting flange 1 and the outer well wall of the observation well 12, and tightened using the lower clamping bolt 14. The annular sealing block 2 should fit tightly against both the lower connecting flange 1 and the well wall of the observation well 12 to provide the first seal. Then, the upper connecting flange 3 is installed on top of the lower connecting flange 1 using fastening bolts, ensuring that the upper connecting flange 3 is aligned and tightly connected with the lower connecting flange 1. A sealing ring 4 is installed in the mounting groove 31 of the upper connecting flange 3 and the lower connecting flange 1, which helps to enhance the sealing between the upper connecting flange 3 and the lower connecting flange 1, further enhancing the sealing performance. A sealing block 5 is installed on the upper connecting flange 3, positioned at the top of the wellhead of the observation well 12. Simultaneously, at the connection between the sealing block 5 and the upper connecting flange 3, and at the connection between the inner well wall of the observation well 12 and the sealing block 5… Install sealing rings 6 at the connection points to ensure a good seal. Use upper tightening bolts 32 to tighten the sealing rings 6 at the connection between the sealing block 5 and the upper connecting flange 3 to ensure a good seal. Install sealing plugs 9 on the connecting pipe 7 and the vent pipe 8. Install sealing rings 10 at the connection between the connecting pipe 7 and the sealing plug 9, and at the connection between the vent pipe 8 and the sealing plug 9, to provide additional sealing protection. Apply sealant to the connection between the cable 11 and the round hole 91 of the sealing plug 9 on the connecting pipe 7. Then extend the cable 11 through the round hole 91 into the observation well 12. This can prevent gas leakage and allow the connection of sensors and other equipment for monitoring via the cable 11.

[0020] like Figure 4 , Figure 6 As shown, flexible sealing blocks 15 are installed at the ends of the lower clamping bolt 14 and the upper clamping bolt 32 to prevent the lower clamping bolt 14 and the upper clamping bolt 32 from directly pressing against the annular sealing block 2 and the sealing ring 6, thereby preventing damage to the annular sealing block 2 and the sealing ring 6 and extending the service life of the annular sealing block 2 and the sealing ring 6.

[0021] The annular sealing block 2 is made of copper alloy material with high strength and wear resistance, suitable for high temperature, high pressure and corrosive environments.

[0022] The sealing ring 6 is made of rubber material with good elasticity and adaptability, which can adapt to a certain degree of deformation of the wellhead of the observation well 12.

[0023] Work process:

[0024] The lower connecting flange 1 is fixed to the well wall of the observation well 12 using fastening bolts and threaded holes 13, ensuring that the lower connecting flange 1 is firmly installed and tightly fitted to the well wall of the observation well 12. An annular sealing block 2 is placed between the lower connecting flange 1 and the outer well wall of the observation well 12, and tightened using the lower clamping bolt 14. The annular sealing block 2 should fit tightly against both the lower connecting flange 1 and the well wall of the observation well 12 to provide the first seal. Then, the upper connecting flange 3 is installed on top of the lower connecting flange 1 using fastening bolts, ensuring that the upper connecting flange 3 is aligned and tightly connected with the lower connecting flange 1. A sealing ring 4 is installed in the mounting groove 31 of the upper connecting flange 3 and the lower connecting flange 1, which helps to enhance the sealing between the upper connecting flange 3 and the lower connecting flange 1, further enhancing the sealing performance. A sealing block 5 is installed on the upper connecting flange 3, positioned at the top of the wellhead of the observation well 12. Simultaneously, at the connection between the sealing block 5 and the upper connecting flange 3, and at the connection between the inner well wall of the observation well 12 and the sealing block 5… A sealing ring 6 is installed at the connection to ensure a good seal. The upper tightening bolt 32 is used to tighten the sealing ring 6 at the connection between the sealing block 5 and the upper connecting flange 3 to ensure a sealing effect. A sealing plug 9 is installed on the connecting pipe 7 and the gas outlet pipe 8. A sealing ring 10 is installed at the connection between the connecting pipe 7 and the sealing plug 9, and at the connection between the gas outlet pipe 8 and the sealing plug 9, to provide additional sealing protection. Sealant is applied to the connection between the cable 11 and the round hole 91 of the sealing plug 9 on the connecting pipe 7. Then the cable 11 is extended through the round hole 91 into the inside of the observation well 12. This can prevent gas leakage and allow the connection of sensors and other equipment for monitoring through the cable 11. Through the multiple sealing structures, including the annular sealing block 2, the sealing ring 4, the sealing ring 6, and the sealing ring 10, working together, gas leakage is prevented at the wellhead of the observation well 12 and at each connecting component, ensuring the accuracy and reliability of gas collection, so as to obtain earthquake precursor information by measuring the physical and chemical properties of underground fluids.

[0025] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A wellhead gas collection and sealing device for seismic fluid observation wells, characterized in that: The aforementioned wellhead gas collection and sealing device for seismic fluid observation wells includes a lower connecting flange (1), an annular sealing block (2), an upper connecting flange (3), a sealing ring (4), a plugging block (5), a sealing rubber ring (6), a connecting pipe (7), an outlet pipe (8), a sealing plug (9), a sealing ring (10), and a cable (11). The lower connecting flange (1) has a threaded hole (13), and a fastening bolt passes through the threaded hole (13) to install the lower connecting flange (1) on the well wall of the observation well (12). An annular sealing block (2) is installed between the lower connecting flange (1) and the outer wall of the observation well (12), and fits tightly against the lower connecting flange (1) and the outer wall of the observation well (12). The lower connecting flange (1) is provided with a lower clamping bolt (14) for clamping the annular sealing block (2). The upper connecting flange (3) is installed on the top of the lower connecting flange (1) by fastening bolts. The lower connecting flange (1) and the upper connecting flange (3) are provided with mounting grooves (31), and the sealing ring (4) is installed in the mounting groove (31). The plugging block (5) is installed on the upper connecting flange (3) at the top of the wellhead of the observation well (12). Sealing rings (6) are installed at the connection between the upper connecting flange (3) and the plugging block (5), and at the connection between the inner wall of the observation well (12) and the plugging block (5). An upper tightening bolt (32) is provided on the upper connecting flange (3) to tighten the sealing ring (6) at the connection between the plugging block (5) and the upper connecting flange (3). A connecting pipe (7) and an air outlet pipe (8) are installed at the top of the plugging block (5) to connect... Pipe (7) and air outlet pipe (8) are connected to observation well (12). A sealing plug (9) is installed on the connecting pipe (7) and air outlet pipe (8). A sealing ring (10) is installed at the connection between the connecting pipe (7) and the sealing plug (9) and at the connection between the air outlet pipe (8) and the sealing plug (9). The sealing plug (9) on the connecting pipe (7) has a round hole (91). The cable (11) passes through the round hole (91) and extends into the observation well (12). The connection between the cable (11) and the round hole (91) is coated with sealant.

2. The wellhead gas collection and sealing device for seismic fluid observation wells as described in claim 1, characterized in that: Flexible sealing blocks (15) are installed at the ends of the lower clamping bolt (14) and the upper clamping bolt (32).

3. A wellhead gas-collecting sealing device for seismic fluid observation wells as described in claim 1 or 2, characterized in that: The annular sealing block (2) is made of copper alloy material with high strength and wear resistance, suitable for high temperature, high pressure and corrosive environment.

4. A wellhead gas-collecting sealing device for seismic fluid observation wells as described in claim 1 or 2, characterized in that: The sealing ring (6) is made of rubber material that is elastic and adaptable and can adapt to a certain degree of deformation of the wellhead of the observation well (12).

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