CN209780829U - Metal double-sealing casing head for gas storage well - Google Patents
Metal double-sealing casing head for gas storage well Download PDFInfo
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- CN209780829U CN209780829U CN201920585024.6U CN201920585024U CN209780829U CN 209780829 U CN209780829 U CN 209780829U CN 201920585024 U CN201920585024 U CN 201920585024U CN 209780829 U CN209780829 U CN 209780829U
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Abstract
The utility model discloses a gas storage well metal double-seal casing head, which belongs to the field of gas storage well casing heads, and comprises a casing head cross joint, a conversion flange and a casing head body, wherein the lower end of the casing head body is connected with a surface casing, a first casing slip hanger is arranged in the casing head body, the first casing slip hanger is connected with a technical casing in a hanging manner, a coupling is respectively designed above two casing slip hangers, the first casing slip hanger is connected with the technical casing through threads, two stop blocks are also designed, the stop blocks can block the metal seal and enable the metal seal to deform and hold the coupling tightly through compression, thereby realizing the metal seal, a BT seal ring is also designed, the effect of double insurance is achieved through the seal of the metal seal and the BT seal ring, a pressure test hole is designed at the left lower part of the conversion flange, the pressure of the casing annulus can be detected, once the pressure changes, effective measures can be taken to carry out the well sealing operation.
Description
Technical Field
The utility model relates to a gas storage well casing head field, more specifically say, relate to a gas storage well metal double containment casing head.
Background
With the rapid development of national economy and the increasing demand for energy, underground gas storage plays a more important role in the fields of oil and gas consumption and oil and gas safety in China, the target of building a reservoir extends and develops from the current peak regulation mode to the strategic reserve mode, and the technical level of reservoir building is continuously improved in practice. Underground gas storage has a great role in the development of the natural gas industry, so governments and enterprises pay high attention to the development. According to the deployment of national overall strategy, China will form four regional interconnected and coordinated gas storage groups: the system comprises a northeast gas storage group, a northChina gas storage group, a Yangtze river middle and downstream gas storage group and a Zhujiang delta gas storage group. In 2020, the country can plan to build more than 30 underground gas storage reservoirs, and the peak-adjustable total amount reaches 320 multiplied by 10 m.
Summary of the use of the previous casing head products, we find that the previous casing head can basically meet the requirements of drilling and production when applied to common well conditions such as oil extraction, water injection, fracturing and the like, but for a gas storage well, the concentration of corrosive gas under the gas storage well is extremely high, the requirement on the corrosion resistance of a casing head device is extremely high, the sealing assembly of the previous casing head is generally a common sealing process such as simple rubber sealing, and the like, for the gas storage well, in a short time, the sealing assembly of the previous casing head is corroded by corrosive gas media under the gas storage well, so that the sealing is particularly easy to fail and the sealing is finally failed, and for the structural design of the traditional casing head, once the sealing failure or leakage of the gas storage well occurs, the personal safety of operators on the well is seriously threatened, moreover, due to the structural limitation of the conventional casing head, the leakage is very troublesome to remedy once, and the working efficiency of the whole production flow is affected.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
Problem to exist among the prior art, an object of the utility model is to provide a gas storage well metal double containment casing head, it has the coupling through the top design respectively at two sleeve pipe slips hangers, it is connected with technical casing through the screw thread, it has two dogs still to design, the dog can block metal seal and impel it to warp through the compression and embrace the coupling tightly, thereby realize metal seal, the BT sealing washer has still been designed, through the sealing of metal seal with the BT sealing washer, play the effect of dual fail-safe, there is the pressure testing hole through the design of left side below at the conversion flange, can be used for detecting the annular pressure of sleeve pipe, in case pressure changes, can take effective measure to seal up the well operation.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
A metal double-sealing casing head for a gas storage well comprises a casing head cross joint, a conversion flange and a casing head body, wherein the lower end of the casing head body is connected with a surface casing, a first casing slip hanger is arranged in the casing head body, the first casing slip hanger is connected with a technical casing in a hanging manner, the upper end of the technical casing is connected with a first coupling, the upper end of the first coupling extends into the lower end of the interior of the casing head cross joint, the lower end of the interior of the casing head cross joint is respectively provided with a first BT sealing ring and a first metal seal, the lower end of the first metal seal is connected with a first stop dog in a contact manner, the first stop dog is sleeved with the upper end of the casing head body, a second casing slip hanger is arranged in the casing head cross joint, the second casing slip hanger is connected with an oil layer casing in a hanging manner, and the upper end of the oil layer casing is connected with a second coupling, the upper end of second coupling stretches into the inside lower extreme of conversion flange, install second BT sealing washer and second metal seal in the conversion flange respectively, the lower extreme contact of second metal seal is connected with the second dog, it has the coupling through the design respectively in the top of two sleeve pipe slips hangers, it is connected with technical casing through the screw thread, it has two dogs still to design, the dog can block metal seal and impel its deformation through the compression to hold the coupling tightly, thereby realize metal seal, the BT sealing washer has still been designed, through the sealed of metal seal and BT sealing washer, play the effect of dual fail-safe, through the design of the left side below at the conversion flange pressure testing hole, can be used for detecting the pressure of sleeve pipe annular space, in case pressure changes, can take effective measure to seal up the well operation.
Further, the sheathed tube outside in top layer is provided with the external screw thread, the inside of casing head body is provided with the internal thread, the sheathed tube external screw thread in top layer passes through threaded connection with the internal thread of casing head body, and through the internal screw thread cooperation of sheathed tube external screw thread in top layer and casing head body, can realize being connected of top layer sleeve pipe and casing head body.
Further, first gate valve and second gate valve are installed respectively to both sides about the casing head body, first gate valve passes through bolted connection with the casing head body, the second gate valve passes through threaded connection with the casing head body, can install the both sides at the casing head body respectively to first gate valve and second gate valve through the bolt.
Further, be provided with the internal thread in the first coupling, the outside of technology sheathed tube is provided with the external screw thread, the threaded connection is passed through with the internal thread of first coupling to the external screw thread of technology sheathed tube, and the installation of first coupling and technology sheathed tube can be realized to the internal thread through first contact and the external screw thread of technology sheathed tube.
Further, third gate valve and fourth gate valve are installed respectively to both sides about casing head cross, the third gate valve passes through bolted connection with casing head cross, the fourth gate valve passes through bolted connection with casing head cross, can install third gate valve and fourth gate valve in the both sides of casing head cross through the bolt.
Further, be provided with the internal thread in the second coupling, the upper portion of oil reservoir sheathed tube is provided with the external screw thread, the internal thread of second coupling passes through threaded connection with oil reservoir sheathed tube external screw thread, and through the cooperation of the internal thread of second coupling and oil reservoir sheathed tube external screw thread, can realize the installation of second coupling and oil reservoir sheathed tube.
Furthermore, the second stop block is sleeved at the upper end of the four-way joint of the casing head, pressure test holes are symmetrically formed in the two sides of the conversion flange, the pressure test holes can be used for detecting the pressure of the annular space of the casing, and once the pressure changes, effective measures can be taken for well sealing operation.
3. Advantageous effects
compared with the prior art, the utility model has the advantages of:
(1) This scheme has the coupling through the top design respectively at two sleeve pipe slips hangers, it is connected with technical casing through the screw thread, it has two dogs still to design, the dog can block metal seal and make its deformation hold the coupling tightly through the compression, thereby realize metal seal, the BT sealing washer has still been designed, through the sealed of metal seal and BT sealing washer, play the effect of dual fail-safe, there is the pressure testing hole through the design of left side below at the conversion flange, can be used for detecting the annular pressure of sleeve pipe, in case pressure changes, can take effective measure to seal the well operation.
(2) The sheathed tube outside in top layer is provided with the external screw thread, and the inside of casing head body is provided with the internal thread, and threaded connection is passed through with the internal thread of casing head body to the sheathed tube external screw thread in top layer, through the internal screw thread cooperation of the sheathed tube external screw thread in top layer and casing head body, can realize being connected of top layer sleeve pipe and casing head body.
(3) first gate valve and second gate valve are installed respectively to both sides about casing head body, and bolted connection is passed through with the casing head body to first gate valve, and threaded connection is passed through with the casing head body to the second gate valve, can install the both sides at the casing head body respectively to first gate valve and second gate valve through the bolt.
(4) Be provided with the internal thread in the first coupling, technical casing's outside is provided with the external screw thread, and technical casing's external screw thread passes through threaded connection with the internal thread of first coupling, and the installation of first coupling and technical casing can be realized to the internal thread through first contact and technical casing's external screw thread.
(5) The left side and the right side of the casing head four-way joint are respectively provided with a third gate valve and a fourth gate valve, the third gate valve is connected with the casing head four-way joint through a bolt, the fourth gate valve is connected with the casing head four-way joint through a bolt, and the third gate valve and the fourth gate valve can be arranged on two sides of the casing head four-way joint through bolts.
(6) Be provided with the internal thread in the second coupling, the upper portion of oil reservoir sheathed tube is provided with the external screw thread, and the internal thread of second coupling passes through threaded connection with the external screw thread of oil reservoir sheathed tube, through the cooperation of the internal thread of second coupling and oil reservoir sheathed tube external screw thread, can realize second coupling and oil reservoir sheathed tube installation.
(7) The second stop block is sleeved at the upper end of the casing head four-way joint, pressure test holes are symmetrically formed in the two sides of the conversion flange, the pressure of the casing annulus can be detected through the design of the pressure test holes, and once the pressure changes, effective measures can be taken for well sealing operation.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
The reference numbers in the figures illustrate:
The oil layer casing pipe 1, 2 technical casing pipes, 3 surface layer casing pipes, 4 first gate valves, 5 first check blocks, 6 first couplings, 7 third gate valves, 8 casing head cross joints, 9 second check blocks, 10 pressure test holes, 11 second couplings, 12 second BT sealing rings, 13 conversion flanges, 14 second metal seals, 15 second casing slip hangers, 16 fourth gate valves, 17 first BT sealing rings, 18 first metal seals, 19 first casing slip hangers, 20 second gate valves and 21 casing head bodies.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
Referring to fig. 1, a metal double-sealing casing head for a gas storage well comprises a casing head cross-joint 8, a conversion flange 13 and a casing head body 21, referring to fig. 1, the lower end of the casing head body 21 is connected with a surface casing 3, a first casing slip hanger 19 is arranged in the casing head body 21, the first casing slip hanger 19 is connected with a technical casing 2 in a hanging manner, the upper end of the technical casing 2 is connected with a first coupling 6, the upper end of the first coupling 6 extends into the lower end of the interior of the casing head cross-joint 8, the lower end of the interior of the casing head cross-joint 8 is respectively provided with a first BT seal ring 17 and a first metal seal 18, the lower end of the first metal seal 18 is connected with a first stopper 5 in a contacting manner, the first stopper 5 is sleeved with the upper end of the casing head body 21, a second casing slip hanger 15 is arranged in the casing head cross-joint 8, the second casing slip hanger 15 is connected with an oil layer, the upper end of the oil layer casing 1 is connected with a second coupling 11, the upper end of the second coupling 11 extends into the lower end of the interior of a conversion flange 13, a second BT sealing ring 12 and a second metal seal 14 are respectively installed in the conversion flange 13, and the lower end of the second metal seal 14 is in contact connection with a second stop block 9.
Please refer to fig. 1, the outside of the surface casing 3 is provided with an external thread, the inside of the casing head body 21 is provided with an internal thread, the external thread of the surface casing 3 is in threaded connection with the internal thread of the casing head body 21, the connection between the surface casing 3 and the casing head body 21 can be realized through the cooperation of the external thread of the surface casing 3 and the internal thread of the casing head body 21, the second stopper 9 is sleeved at the upper end of the casing head cross-joint 8, the bilateral symmetry of the conversion flange 13 is provided with the pressure test holes 10, the design of the pressure test holes 10 can be used for detecting the pressure of the casing annulus, once the pressure changes, effective measures can be taken for well sealing operation.
Referring to fig. 1, a first gate valve 4 and a second gate valve 20 are respectively installed on the left side and the right side of a casing head body 21, the first gate valve 4 is connected with the casing head body 21 through a bolt, the second gate valve 20 is connected with the casing head body 21 through a thread, the first gate valve 4 and the second gate valve 20 can be respectively installed on the two sides of the casing head body 21 through a bolt, a third gate valve 7 and a fourth gate valve 16 are respectively installed on the left side and the right side of a casing head cross-piece 8, the third gate valve 7 is connected with the casing head cross-piece 8 through a bolt, the fourth gate valve 16 is connected with the casing head cross-piece 8 through a bolt, and the third gate valve 7 and the fourth gate valve 16 can be installed on the two sides of the casing.
Please refer to fig. 1, an internal thread is provided in the first coupling 6, an external thread is provided outside the technical casing 2, the external thread of the technical casing 2 is in threaded connection with the internal thread of the first coupling 6, the installation of the first coupling 6 and the technical casing 2 can be realized through the internal thread of the first contact 6 and the external thread of the technical casing 2, an internal thread is provided in the second coupling 11, an external thread is provided on the upper portion of the oil casing 1, the internal thread of the second coupling 11 is in threaded connection with the external thread of the oil casing 1, and the installation of the second coupling 11 and the oil casing 1 can be realized through the matching of the internal thread of the second coupling 11 and the external thread of the oil casing 1.
The gas storage metal double-seal casing head is characterized in that a first coupling 6 is designed above a first casing slip hanger 19 and is connected with a technical casing 2 through threads, the first coupling and the technical casing 2 are hung above the first casing slip hanger 19 together, a first stop block 5 is designed inside a casing head body 21, the first stop block 5 can block a first metal seal 18 and enables the first metal seal 18 to deform and tightly hold the first coupling 6 through compression, so that metal sealing is realized, a first BT seal ring 17 is designed above the first metal seal 18, sealing can be realized through injecting sealing grease into the first metal seal 18, and the first metal seal 18 and the first BT seal ring 17 form double sealing to achieve the effect of double insurance; a second coupling 11 is designed above a second casing slip hanger 19 and is connected with an oil layer casing 1 through threads, the second coupling 11 and the oil layer casing are hung above a second casing slip hanger 15 together, a second stop block 9 is designed inside a casing head four-way joint 8, the second stop block 9 can block a second metal seal 14 and enables the second metal seal 14 to deform and hold the second coupling 11 tightly through compression, so that metal sealing is realized, a second BT sealing ring 12 is designed on the second metal seal 14, sealing can be realized through injecting sealing grease into the second metal seal, and the second metal seal 14 and the second BT sealing ring 12 form double sealing to achieve the effect of double insurance; a pressure test hole 10 is designed at the left lower part of the conversion flange 13 and can be used for detecting the pressure of the casing annulus, and once the pressure changes, effective measures can be taken for well sealing operation.
The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.
Claims (7)
1. The utility model provides a gas storage well metal double containment casing head, includes casing head cross (8), conversion flange (13) and casing head body (21), its characterized in that: the lower end of the casing head body (21) is connected with a surface casing (3), a first casing slip hanger (19) is arranged in the casing head body (21), the first casing slip hanger (19) is connected with a technical casing (2) in a hanging manner, the upper end of the technical casing (2) is connected with a first coupling (6), the upper end of the first coupling (6) extends into the inner lower end of the casing head cross (8), the inner lower end of the casing head cross (8) is respectively provided with a first BT sealing ring (17) and a first metal seal (18), the lower end of the first metal seal (18) is connected with a first check block (5) in a contact manner, the first check block (5) is sleeved with the upper end of the casing head body (21), the inner part of the casing head cross (8) is provided with a second casing slip hanger (15), the second casing slip hanger (15) is used for hanging an oil layer connecting casing (1), the upper end of oil layer sleeve pipe (1) is connected with second coupling (11), the inside lower extreme of conversion flange (13) is stretched into to the upper end of second coupling (11), install second BT sealing washer (12) and second metal seal (14) in conversion flange (13) respectively, the lower extreme contact of second metal seal (14) is connected with second stopper (9).
2. The gas storage well metal double-seal casing head according to claim 1, characterized in that: the outer side of the surface layer sleeve (3) is provided with an external thread, the inner part of the sleeve head body (21) is provided with an internal thread, and the external thread of the surface layer sleeve (3) is connected with the internal thread of the sleeve head body (21) through the thread.
3. The gas storage well metal double-seal casing head according to claim 1, characterized in that: first gate valve (4) and second gate valve (20) are installed respectively to the left and right sides of casing head body (21), bolted connection is passed through with casing head body (21) in first gate valve (4), threaded connection is passed through with casing head body (21) in second gate valve (20).
4. The gas storage well metal double-seal casing head according to claim 1, characterized in that: be provided with the internal thread in first coupling (6), the outside of technique sleeve pipe (2) is provided with the external screw thread, the external screw thread of technique sleeve pipe (2) passes through threaded connection with the internal thread of first coupling (6).
5. The gas storage well metal double-seal casing head according to claim 1, characterized in that: third gate valve (7) and fourth gate valve (16) are installed respectively to both sides about casing head cross (8), third gate valve (7) pass through bolted connection with casing head cross (8), fourth gate valve (16) pass through bolted connection with casing head cross (8).
6. The gas storage well metal double-seal casing head according to claim 1, characterized in that: the oil-well casing is characterized in that an internal thread is arranged in the second coupling (11), an external thread is arranged on the upper portion of the oil-well casing (1), and the internal thread of the second coupling (11) is in threaded connection with the external thread of the oil-well casing (1).
7. The gas storage well metal double-seal casing head according to claim 1, characterized in that: the second stop block (9) is sleeved at the upper end of the casing head four-way joint (8), and pressure test holes (10) are symmetrically arranged on two sides of the conversion flange (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920585024.6U CN209780829U (en) | 2019-04-26 | 2019-04-26 | Metal double-sealing casing head for gas storage well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920585024.6U CN209780829U (en) | 2019-04-26 | 2019-04-26 | Metal double-sealing casing head for gas storage well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209780829U true CN209780829U (en) | 2019-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920585024.6U Active CN209780829U (en) | 2019-04-26 | 2019-04-26 | Metal double-sealing casing head for gas storage well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209780829U (en) |
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2019
- 2019-04-26 CN CN201920585024.6U patent/CN209780829U/en active Active
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