CN212671598U - Casing thread structure for well drilling casing gas sealing - Google Patents
Casing thread structure for well drilling casing gas sealing Download PDFInfo
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- CN212671598U CN212671598U CN202020783953.0U CN202020783953U CN212671598U CN 212671598 U CN212671598 U CN 212671598U CN 202020783953 U CN202020783953 U CN 202020783953U CN 212671598 U CN212671598 U CN 212671598U
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Abstract
The utility model discloses a sleeve pipe thread structure for well drilling sleeve pipe is airtight, include: the coupling and the symmetry set up the sleeve pipe at coupling both ends the middle part of coupling is provided with interface channel the symmetry has interior conical thread on the coupling inner wall at interface channel both ends interior conical thread is provided with interior conical thread back-off cutter process groove on being close to the coupling inner wall of interface channel one end interior conical thread back-off cutter process groove is provided with interior annular conical surface on being close to the coupling inner wall of interface channel one end be provided with annular circular arc seal groove on the coupling inner wall between interior annular conical surface and the interface channel be provided with the outer cone screw thread of mutually supporting with interior conical thread on the sheathed tube outer wall be provided with the outer annular conical surface of mutually supporting with interior annular conical surface on the sleeve pipe outer wall that outer cone screw thread is close to interface channel one end.
Description
Technical Field
The utility model relates to an oil field especially relates to a sleeve pipe thread structure for well drilling sleeve pipe is airtight.
Background
In the oil exploitation operation, the drilling operation is realized by connecting a coupling and a casing, the API standard casing threaded connection is generally adopted in the published patent, the requirement of only realizing water seal with rated pressure of 35MPa can be realized according to the specification, and the air seal requirement can not be reached.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the casing thread structure for the gas seal of the well drilling casing with good sealing effect is provided.
In order to solve the technical problem, the utility model discloses a technical scheme is: a casing thread form for gas sealing of a well casing, comprising: a coupling and sleeves symmetrically arranged at the two ends of the coupling, a connecting channel is arranged in the middle of the coupling, inner conical threads are symmetrically arranged on the inner wall of the coupling at the two ends of the connecting channel, inner conical thread tool withdrawal process grooves are arranged on the inner wall of the coupling at one end of the inner conical threads close to the connecting channel, an inner annular conical surface is arranged on the inner wall of the coupling at one end of the inner cone thread tool retracting process groove close to the connecting channel, an annular arc sealing groove is arranged on the inner wall of the coupling between the inner annular conical surface and the connecting channel, the outer wall of the sleeve is provided with outer conical threads matched with the inner conical threads, the outer wall of the sleeve, close to one end of the connecting channel, of the outer conical threads is provided with an outer annular conical surface matched with the inner annular conical surface, and an annular arc sealing bulge matched with the annular arc sealing groove is arranged on the end face of the sleeve pipe, close to one end of the connecting channel, of the outer annular conical surface.
In order to better solve the technical problem, the utility model discloses a further technical scheme is: the included angle between the inner annular conical surface and the axis of the sleeve and the included angle between the outer annular conical surface and the axis of the sleeve are both 6.5-7.5 degrees.
The utility model has the advantages that: above-mentioned a sleeve pipe thread structure for well drilling sleeve pipe is airtight, coupling and sleeve pipe offset through the inner ring conical surface separately on the sealed basis of threaded connection and realize interference fit secondary seal, and the sealed arch of annular circular arc of sleeve pipe tip can firmly offset with the sealed recess of annular circular arc on the coupling and realize the tertiary seal, it is sealed effectual, the restriction that can break through API specified rated pressure 35MPa reaches 105MPa, can also realize airtight requirement simultaneously, can realize the drilling equipment requirement of superhigh pressure, and possess airtight effect, make the on-the-spot well drilling degree of depth improve greatly, show the output that promotes the oil gas field, and the work efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of the casing thread structure for hermetic sealing of a well casing according to the present invention.
FIG. 2 is a schematic view of the collar of FIG. 1.
Fig. 3 is a schematic view of the structure of the bushing of fig. 1.
In the figure: 1. the connecting device comprises a coupling, 11, a connecting channel, 12, an inner conical thread, 13, an inner conical thread tool withdrawal process groove, 14, an inner annular conical surface, 15, an annular circular arc sealing groove, 2, a sleeve, 21, an outer conical thread, 22, an outer annular conical surface, 23 and an annular circular arc sealing protrusion.
Detailed Description
The following detailed description of the present invention will be made in conjunction with the accompanying drawings and specific embodiments.
As shown in fig. 1, 2 and 3, the casing thread structure for gas sealing of a well casing comprises: coupling 1 and the symmetry setting are at the sleeve pipe 2 at coupling 1 both ends coupling 1's middle part is provided with interface channel 11 the symmetry has interior taper screw 12 on the coupling 1 inner wall at interface channel 11 both ends interior taper screw 12 is provided with interior taper screw and moves back sword process groove 13 on being close to coupling 1 inner wall of interface channel 11 one end interior taper screw moves back sword process groove 13 and is provided with interior annular cone 14 on being close to coupling 1 inner wall of interface channel 11 one end interior annular cone 14 is provided with annular circular arc sealing groove 15 on coupling 1 inner wall between interface channel 11 be provided with the outer cone screw 21 of mutually supporting with interior taper screw 12 on the outer wall of sleeve pipe 2 outer cone screw 21 is provided with the outer annular cone 22 of mutually supporting with interior annular cone 14 on the sleeve pipe 2 outer wall that is close to interface channel 11 one end outer annular cone 22 is provided with annular circular arc sealing concave on the sleeve pipe 2 terminal surface that is close to interface channel 11 one end The grooves 15 are matched with annular arc sealing bulges 23.
As shown in fig. 1, 2 and 3, in this example, the included angle between the inner annular tapered surface 14 and the axis of the sleeve 2 and the included angle between the outer annular tapered surface 22 and the axis of the sleeve 2 are both 6.5 ° to 7.5 °.
During installation, the sleeve 2 is screwed into the inner conical thread 12 in the coupling 1 through the outer conical thread 21, when the outer annular conical surface 22 on the sleeve 2 is abutted against the inner annular conical surface 14 in the coupling 1, the interference fit is realized by continuously screwing, and meanwhile, the annular circular arc sealing bulge 23 at the end part of the sleeve 2 is also inserted into the annular circular arc sealing groove 15 in the coupling 1 and is firmly abutted against the annular circular arc sealing groove, and at the moment, the sealing installation is realized.
Claims (2)
1. A sleeve pipe thread structure for well drilling sleeve pipe is airtight, its characterized in that: the method comprises the following steps: coupling (1) and symmetry set up sleeve pipe (2) at coupling (1) both ends coupling (1)'s middle part is provided with interface channel (11) symmetry on coupling (1) inner wall at interface channel (11) both ends has interior taper screw thread (12) are provided with interior taper screw thread back-off sword process groove (13) on coupling (1) inner wall near interface channel (11) one end interior taper screw thread back-off sword process groove (13) are provided with interior annular cone face (14) on coupling (1) inner wall near interface channel (11) one end be provided with annular circular arc sealing groove (15) on coupling (1) inner wall between interior annular cone face (14) and interface channel (11) be provided with outer cone screw thread (21) of mutually supporting with interior taper screw thread (12) on the outer wall of sleeve pipe (2) that outer cone screw thread (21) are close to interface channel (11) one end be provided with interior ring on sleeve pipe (2) outer wall And the end surface of the sleeve (2) at one end of the outer annular conical surface (22) close to the connecting channel (11) is provided with an annular arc sealing bulge (23) matched with the annular arc sealing groove (15).
2. The casing thread structure for gas sealing of well casing according to claim 1, wherein: the included angle between the inner annular conical surface (14) and the axis of the sleeve (2) and the included angle between the outer annular conical surface (22) and the axis of the sleeve (2) are both 6.5-7.5 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020783953.0U CN212671598U (en) | 2020-05-13 | 2020-05-13 | Casing thread structure for well drilling casing gas sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020783953.0U CN212671598U (en) | 2020-05-13 | 2020-05-13 | Casing thread structure for well drilling casing gas sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212671598U true CN212671598U (en) | 2021-03-09 |
Family
ID=74814572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020783953.0U Active CN212671598U (en) | 2020-05-13 | 2020-05-13 | Casing thread structure for well drilling casing gas sealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212671598U (en) |
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2020
- 2020-05-13 CN CN202020783953.0U patent/CN212671598U/en active Active
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