CN201386838Y - Mandatory check valve - Google Patents
Mandatory check valve Download PDFInfo
- Publication number
- CN201386838Y CN201386838Y CN200920079054U CN200920079054U CN201386838Y CN 201386838 Y CN201386838 Y CN 201386838Y CN 200920079054 U CN200920079054 U CN 200920079054U CN 200920079054 U CN200920079054 U CN 200920079054U CN 201386838 Y CN201386838 Y CN 201386838Y
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- CN
- China
- Prior art keywords
- seat
- valve
- main body
- spring
- righting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a mandatory check valve which belongs to blowout preventers in oil and gas drill strings. The mandatory check valve comprises a fixed connector, a main body, an O-type seal ring, a valve seat, a valve core, a valve sleeve, a spring, a righting seat and a righting sleeve, wherein the inner thread at the upper part of the fixed connector is connected with a drilling tool, the outer thread at the lower part is connected with the inner thread of the main body, the outer thread at the lower part of the main body is connected with the drilling tool or a drill bit, the valve seat is positioned between the fixed connector and a shoulder of the main body, the outer thread of the valve core is connected with the inner thread of the valve sleeve, the spring is sheathed on the valve core, the upper end of the spring pushes against the valve core, the lower end sits on the righting seat, a cylindrical rod at the lower part of the valve core penetrates the righting seat, the inner thread of the righting seat is connected with the outer thread of the righting sleeve, the righting seat sits on the inner step at the lower part of the main body, and lubricating oil is filled in the righting sleeve. The mandatory check valve can effectively avoid the fracture of the spring or the failure of locking dead of the mandatory check valve, lead the mandatory check valve to be capable of normally opening or sealing a drilling liquid circulation passage and ensure the safety of drilling operation.
Description
Technical field
A kind of pressure safety check is used for the oil and gas well drilling operation and prevents that drilling fluid refluxes in the drill string, belongs to blowout prevention equipment manufacturing technology field in the oil and gas well drilling drill string.
Background technique
Both at home and abroad when implementing oil and gas well drilling,, generally safety check is installed in a bottom joint drill collar top, thereby realizes blowout prevention function in the drill string at present in order to prevent that drilling fluid refluxes in the drill string.Optional safety check is in the little situation lower seal difficulty of return pressure, the general employing seldom, and the pressure safety check that spring is housed uses more, but the existing spring that the pressure safety check of spring is housed is to be exposed in the drilling fluid, impurity particles such as the silt in the drilling fluid are piled up easily even are clamped on and cause spring to follow the string in the middle of the spring even rupture, in order to satisfy the requirement of other complex situations such as down-hole high pressure, impure, high temperature, need a kind of pressure safety check that can realize blowout prevention in the drill string effectively, safely of design.
Summary of the invention
The purpose of this utility model is at the existing problem that spring lost efficacy easily when forcing safety check to be used for blowout prevention in the drill string, has designed a kind of pressure safety check that can effectively protect spring.
The technical solution of the utility model is: the utility model comprises permanent joint, main body, O RunddichtringO, valve seat, spool, valve pocket, spring, sets upright seat, supporting positive cover.
The permanent joint upper internal threaded is connected with drilling tool, lower external thread is connected with the main body internal thread, the lower body part outside thread is connected with drilling tool or drill bit, valve seat is between permanent joint and main body shoulder, the spool outside thread is connected with the valve pocket internal thread, the valve core housing upper spring, the spring upper end withstands on the spool, the lower end is sitting in to be set upright on the seat, spool lower cylindrical bar passes sets upright seat, sets upright an internal thread and is connected with the supporting positive cover outside thread, sets upright seat and is sitting on the interior step of lower body part, 2 O RunddichtringOs are housed on the valve seat cylindrical, and irritating in the supporting positive cover has lubricant oil.
The utility model is not when having circulation of drilling fluid, because spring action, spool and valve base sealing; When normal drilling well, move down at drilling fluid effect lower valve core, open the drilling fluid passage, realize the drilling fluid direct circulation; When bottom pressure greater than drilling well liquid columnpressure, when drilling fluid upwards flows from the shaft bottom, hydrodynamic pressure promotes spool and moves up, impel spool to contact and seal drilling fluid with valve seat, stop drilling fluid anti-circulation in drilling tool, valve pocket and set upright the seat can stop drilling fluid directly to wash away spring, avoid spring breakage or be stuck inefficacy.
The utility model beneficial effect is: can effectively avoid forcing the check-valve spring fracture or inefficacys that be stuck, the pressure safety check is normally opened in the oil and gas well drilling process or be sealed the circulation of drilling fluid passage, guarantee drillng operation safety.
Description of drawings:
Fig. 1 is the utility model cross-sectional view.
Embodiment:
The utility model comprises permanent joint 1, main body 2, O RunddichtringO 3, valve seat 4, spool 5, valve pocket 6, spring 7, sets upright seat 8, supporting positive cover 9.
When there not being drilling fluid to do the time spent, under spring 7 effects, spool 5 and valve seat 4 sealings; Do the time spent as drilling fluid, drilling liquid pressure acts on the spool 5, promotes spool 5 and moves down, and opens the drilling fluid passage, is implemented in direct circulation in the drilling tool; When drilling well liquid columnpressure refluxes less than the strata pressure drilling fluid, under drilling fluid makes progress the flowing pressure effect, promote spool 5 and move up, realize spool 5 and valve seat 4 sealings, stop drilling fluid in drilling tool inner counter circulation purpose thereby reach.Valve pocket 6 and set upright seat 8 and can stop drilling fluid directly to wash away spring 7 is avoided spring 7 fracture or the inefficacies that are stuck, thereby has guaranteed that the utility model can normally open or seal the circulation of drilling fluid passage.
Claims (3)
1. pressure safety check, comprise permanent joint, main body, the O RunddichtringO, valve seat, spool, valve pocket, spring, set upright seat, supporting positive cover, it is characterized in that: the permanent joint upper internal threaded is connected with drilling tool, lower external thread is connected with the main body internal thread, the lower body part outside thread is connected with drilling tool or drill bit, valve seat is between permanent joint and main body shoulder, the spool outside thread is connected with the valve pocket internal thread, the valve core housing upper spring, the spring upper end withstands on the spool, and the lower end is sitting in to be set upright on the seat, and spool lower cylindrical bar passes sets upright seat, set upright an internal thread and be connected, set upright seat and be sitting on the interior step of lower body part with the supporting positive cover outside thread.
2. a kind of pressure safety check according to claim 1 is characterized in that being equipped with on the valve seat cylindrical 2 O RunddichtringOs.
3. a kind of pressure safety check according to claim 1 is characterized in that filling has lubricant oil in the supporting positive cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920079054U CN201386838Y (en) | 2009-02-16 | 2009-02-16 | Mandatory check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920079054U CN201386838Y (en) | 2009-02-16 | 2009-02-16 | Mandatory check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201386838Y true CN201386838Y (en) | 2010-01-20 |
Family
ID=41579371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920079054U Expired - Fee Related CN201386838Y (en) | 2009-02-16 | 2009-02-16 | Mandatory check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201386838Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561995A (en) * | 2012-01-17 | 2012-07-11 | 中国石油大学(华东) | Underground floating valve with high-temperature resistance, high-pressure resistance and corrosion resistance |
| CN103363169A (en) * | 2012-04-06 | 2013-10-23 | 重庆博张机电设备有限公司 | Pressure regulating valve |
| CN103953759A (en) * | 2014-04-27 | 2014-07-30 | 张志雄 | Flange joint copper alloy five-blade connecting rib check valve |
-
2009
- 2009-02-16 CN CN200920079054U patent/CN201386838Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561995A (en) * | 2012-01-17 | 2012-07-11 | 中国石油大学(华东) | Underground floating valve with high-temperature resistance, high-pressure resistance and corrosion resistance |
| CN102561995B (en) * | 2012-01-17 | 2015-06-24 | 中国石油大学(华东) | Underground floating valve with high-temperature resistance, high-pressure resistance and corrosion resistance |
| CN103363169A (en) * | 2012-04-06 | 2013-10-23 | 重庆博张机电设备有限公司 | Pressure regulating valve |
| CN103363169B (en) * | 2012-04-06 | 2015-07-08 | 重庆博张机电设备有限公司 | Pressure regulating valve |
| CN103953759A (en) * | 2014-04-27 | 2014-07-30 | 张志雄 | Flange joint copper alloy five-blade connecting rib check valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20170216 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |