CN201321852Y - Constant-pressure blanking plug - Google Patents
Constant-pressure blanking plug Download PDFInfo
- Publication number
- CN201321852Y CN201321852Y CNU2008202117734U CN200820211773U CN201321852Y CN 201321852 Y CN201321852 Y CN 201321852Y CN U2008202117734 U CNU2008202117734 U CN U2008202117734U CN 200820211773 U CN200820211773 U CN 200820211773U CN 201321852 Y CN201321852 Y CN 201321852Y
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- China
- Prior art keywords
- pressure
- adapter sleeve
- blanking plug
- piston
- lower house
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- Expired - Fee Related
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Abstract
The utility model relates to a constant-pressure blanking plug, which mainly solves the problem of partial pressure water injection and realizes pressure-limiting effect on local over permit pressure bed. The constant-pressure blanking plug is characterized in that a cam shell (4) is connected with an upper shell connecting sleeve (5), a lower shell connecting sleeve (8), a shell (10) and a guide head (4) in sequence, wherein the side surfaces of the upper shell connecting sleeve (5) and the lower shell connecting sleeve (8) are respectively provided with a pressure guide hole (6) and a water discharge hole (9); the lower end of the lower shell connecting sleeve (8) is fixed at the upper part of a piston cavity (11); pressure-adjusting pistons (7) are arranged in the piston cavity (11) and in the upper inner hole and the lower inner hole of the lower shell connecting sleeve (8); and two end surfaces of each pressure-adjusting piston (7) have the same area, and pressure-adjusting springs (12) are arranged on the lower end of the pressure-adjusting pistons (7). The blanking plug can automatically adjust an injection pressure to achieve a constant-pressure water injection effect.
Description
Technical field
The utility model relates to the downhole tool that oil-field flooding operation is used, and relates to a kind of constant voltage blanking plug specifically.
Background technology
Conventional blanking plug is generally adopted in oil-field flooding both at home and abroad at present, and its principle is to utilize the principle of damming, and changes the individual layer injected water volume by adjusting the water nozzle diameter.For the big injection well of interlayer contradiction, injection rate or injection pressure thin for satisfying, poor layer had both made the strong interval of water absorbing capacity, and the water nozzle diameter transfers to minimum, still can surpass to annotate or superpressure; And, both made the water nozzle diameter transfer to maximum for thin, difference interval, because the annular pressure deficiency, it is not enough water injection rate often to occur, does not reach the effect of the displacement of reservoir oil.Therefore the blanking plug of this routine can't satisfy the waterflooding requirement of the bigger injection well of interlayer contradiction.
The utility model content
For solving water injection well behind the well head pressure-raising, super notes problem appears in the interval water filling that water absorbing capacity is stronger, and the utility model provides a kind of constant voltage blanking plug, and this constant voltage blanking plug can be adjusted injection pressure automatically, reaches the effect of constant voltage water blockoff.
The technical solution of the utility model is: a kind of constant voltage blanking plug, mainly comprise cam shell, described cam shell connects upper shell adapter sleeve, lower house adapter sleeve, housing and guide head successively, and the side of upper shell adapter sleeve and lower house adapter sleeve has pressure guide hole and weep hole respectively; Shoulder fixedly has the piston cavity top of inlet opening in top in the lower end of lower house adapter sleeve, be equipped with relief piston in the endoporus up and down of piston cavity and lower house adapter sleeve, and relief piston is with axial corresponding emboss pit with the lower house connection, and relief piston both ends of the surface area equates, its lower end and be fixed between the vent valve of piston cavity lower end centre bore and be equipped with pressure spring.
Be between described cam shell, upper shell adapter sleeve, lower house adapter sleeve, housing and guide head and be threaded;
Between described lower house adapter sleeve and piston cavity for being threaded;
Be equipped with sealing ring respectively between the upper and lower side external diameter of described relief piston and the endoporus of upper shell adapter sleeve and piston cavity.
The beneficial effects of the utility model are: owing to adopt technique scheme, the upper shell adapter sleeve is provided with pressure guide hole, inside is provided with relief piston, and relief piston two balance face areas equate, and the relief piston lower surface is under the effect of spring, compress with upper shell adapter sleeve inner face, no matter injection pressure is much, the restriction that the motion of relief piston all the is subjected to upper shell adapter sleeve inner face axially-movable that can not make progress, guarantee that the water outlet aperture is constant this moment, thereby guarantee that injection pressure is constant; And when the sleeve annular pressure meets or exceeds the spring preload pressure, acting on the upper surface of relief piston by pressure guide hole, relief piston will be descending and be closed weep hole; When annular pressure was lower than the spring preload pressure, relief piston was up under the effect of spring, opens weep hole, recovered water filling, had so just realized the constant voltage water blockoff.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model.
1-fishing rod 2-gland 3-camshaft 4-cam shell 5-upper shell adapter sleeve 6-pressure guide hole 7-relief piston 8-lower house adapter sleeve 9-weep hole 10-housing 11-piston cavity 12-pressure spring 13-gas-tight screw 14-guide head 15-inlet opening 16-sealing ring 17-inner face
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
Shown in accompanying drawing 1, the fishing rod 1 on this constant voltage blanking plug top gland 2 that is threaded, the cam shell 4 that gland 2 is threaded and is equipped with camshaft 3, upper shell adapter sleeve 5, lower house adapter sleeve 8, housing 10 and guide head 14 and cam shell 4 is threaded successively; And the side of upper shell adapter sleeve 5 and lower house adapter sleeve 8 has pressure guide hole 6 and weep hole 9 respectively; The external diameter on piston cavity 11 tops of inlet opening 15 is arranged at the interior fixedly top of the lower end shoulder hole of lower house adapter sleeve 8, be equipped with relief piston 7 in the endoporus up and down of piston cavity 11 and lower house adapter sleeve 8, relief piston 7 has axial corresponding emboss pit to form tank with lower house adapter sleeve 8, relief piston 7 both ends of the surface areas equate, and its lower end and 13 of vent valves being fixed in piston cavity 11 lower end centre bores are equipped with pressure spring 12.Be equipped with sealing ring 16 respectively between the upper and lower side external diameter of relief piston 7 and upper shell adapter sleeve 5 and piston cavity 11.Housing 10 and guide head 14 carry piston cavity 11, relief piston 7, pressure spring 12 screw-in lower house adapter sleeves 8, and relief piston 11 upper surfaces and upper shell adapter sleeve 5 inner faces 17 compress.
During work, after the constant voltage blanking plug drops into eccentric injection mandrel, oil pipe is suppressed, injecting fluid crosses annular space inflow oil pipe, the sleeve pipe of tank, piston cavity 11 upper portion side wall inlet openings 15 and relief piston 7 and 8 formation of lower house adapter sleeve and goes up the annular space of lower packet formation through guide head 14, piston cavity 11 outer walls, the interior liquid of oil sets annular space this moment acts on relief piston 7 upper surfaces by pressure guide hole 6, claim that this pressure is feedback force, be the stressed pretightning force that shows as feedback force, pressure spring 12 of relief piston, and deadweight and frictional force can be ignored.When annular pressure surpassed pressure spring 12 pretightning forces, relief piston 7 will be descending and be closed weep hole 9, suspends water filling; And when annular pressure was lower than the preload pressure of spring 12, relief piston 7 was up, opened weep hole 9, recovered water filling, and when relief piston 7 axially moves, and the sealing ring sealing is arranged between the endoporus of upper shell adapter sleeve 5 and piston cavity 11, avoid pressure release.The oil jacket annular pressure just maintains in the setup pressure value scope all the time like this, forms the constant voltage water filling in theory.
Claims (4)
1, a kind of constant voltage blanking plug, mainly comprise cam shell (4), it is characterized in that: cam shell (4) connects upper shell adapter sleeve (5), lower house adapter sleeve (8), housing (10) and guide head (14) successively, and the side of upper shell adapter sleeve (5) and lower house adapter sleeve (8) has pressure guide hole (6) and weep hole (9) respectively; Shoulder fixedly has piston cavity (11) top of inlet opening (15) in top in the lower end of lower house adapter sleeve (8), be equipped with relief piston (7) in the endoporus up and down of piston cavity (11) and lower house adapter sleeve (8), and relief piston (7) has axial corresponding emboss pit with lower house adapter sleeve (8), and relief piston (7) both ends of the surface area equates, its lower end and be fixed between the vent valve (13) of piston cavity (11) lower end centre bore and be equipped with pressure spring (12).
2, constant voltage blanking plug according to claim 1 is characterized in that: be between cam shell (4), upper shell adapter sleeve (5), lower house adapter sleeve (8), housing (10) and guide head (14) and be threaded.
3, constant voltage blanking plug according to claim 1 is characterized in that: between lower house adapter sleeve (8) and piston cavity (11) for being threaded.
4, constant voltage blanking plug according to claim 1 is characterized in that: be equipped with sealing ring (16) respectively between the upper and lower side external diameter of relief piston (7) and upper shell adapter sleeve (5) and piston cavity (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202117734U CN201321852Y (en) | 2008-12-21 | 2008-12-21 | Constant-pressure blanking plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202117734U CN201321852Y (en) | 2008-12-21 | 2008-12-21 | Constant-pressure blanking plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201321852Y true CN201321852Y (en) | 2009-10-07 |
Family
ID=41159237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202117734U Expired - Fee Related CN201321852Y (en) | 2008-12-21 | 2008-12-21 | Constant-pressure blanking plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201321852Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239952A (en) * | 2015-09-28 | 2016-01-13 | 梁伟成 | Blowout prevention tool for water injection well |
| CN105370237A (en) * | 2014-08-29 | 2016-03-02 | 中国石油天然气股份有限公司 | Stopper |
-
2008
- 2008-12-21 CN CNU2008202117734U patent/CN201321852Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370237A (en) * | 2014-08-29 | 2016-03-02 | 中国石油天然气股份有限公司 | Stopper |
| CN105370237B (en) * | 2014-08-29 | 2018-05-08 | 中国石油天然气股份有限公司 | A kind of blanking plug |
| CN105239952A (en) * | 2015-09-28 | 2016-01-13 | 梁伟成 | Blowout prevention tool for water injection well |
| CN105239952B (en) * | 2015-09-28 | 2018-05-08 | 梁伟成 | Water injection well jet-preventing tool |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091007 Termination date: 20171221 |