CN2216141Y - Self-filling casing back-pressure valve - Google Patents
Self-filling casing back-pressure valve Download PDFInfo
- Publication number
- CN2216141Y CN2216141Y CN 95203304 CN95203304U CN2216141Y CN 2216141 Y CN2216141 Y CN 2216141Y CN 95203304 CN95203304 CN 95203304 CN 95203304 U CN95203304 U CN 95203304U CN 2216141 Y CN2216141 Y CN 2216141Y
- Authority
- CN
- China
- Prior art keywords
- valve
- valve body
- self
- spool
- contact surface
- 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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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The utility model relates to a self-filling pipe-sleeve back-pressure valve, which is used for cementing operation during putting a sleeve in exploration and development for petroleum and natural gas. The self-filling pipe-sleeve back-pressure valve is composed of a valve body, a valve core and a one-way sealing device, and the one-way sealing device is composed of a valve cover, a torsion spring, etc. One end of the valve core is fixed in the valve body through a cutting pin, and the other end of the valve core props up the valve cover. The utility model has the advantages of simple structure, high grout filling efficiency and good one-way sealing performance, has a self-locking function and a safe cutting function, and is an ideal self-filling pipe-sleeve back-pressure valve.
Description
The utility model relates to a kind of self filling type sleeve pipe back-pressure valve, and it is used for petroleum natural gas exploration casing cementing operation at present.Use it can guarantee that cement paste returns to desired depth, thereby reach the purpose of well cementation.
At present, the design feature and the defective of several self filling type sleeve pipe back-pressure valves of domestic normal use are as follows: (1) adopts the ball float hermetically-sealed construction, the easily erosion of circulation back, lose its one-way sealing property, for avoiding the generation of this class problem, present domestic most of float collar has adopted two ball float structures, to improve its one-way sealing property.(2) the self filling type sleeve pipe back-pressure valve of present domestic use all is plug basically, just has the one-way sealing effect after the bruising, thorn leakage phenomenon takes place in cementing head in the mud process in case replace, and then can't guarantee normally carrying out of cementing operation, very easily irritates " sausage " accident.(3) grout hole of the prior design of most of employing, and mostly be the lateral irrigation formula, grouting effect can not guarantee a mouth mouthful well ideal, easily causes return mud in grout hole obstruction and generation down-hole complexity or the sleeve pipe, influences the operation of trapping.(4) the self filling type sleeve pipe back-pressure valve major part of present domestic use is not emptied function, and it also is unsettled emptying that this function is arranged individually, easily causes the down-hole complexity.(5) most of self filling type sleeve pipe back-pressure valve does not have auto-lock function, is unable to cope with because the down hole problem that grout hole occurs when being pressed off suddenly again after stopping up.Just because of there being these defectives, cause present self filling type sleeve pipe back-pressure valve to fail to popularize in an all-round way at home application.
The purpose of this utility model is at above-mentioned shortcoming of the prior art, and provide a kind of simple in structure, one-way sealing property good, and has auto-lock function and safety is emptied the self filling type sleeve pipe back-pressure valve of function.
The purpose of this utility model is to realize like this, it is made up of valve body 1, spool 5 and valve gap 7, the grout hole of spool 5 is straight filling formula grout hole, one end of spool 5 is fixed in the valve body 1 by cutting off 3, the other end jack-up valve gap 7 of spool 5, valve gap 7 is contained on the journal stirrup 9 on valve body 1 side by support plate 10 and bearing pin 8, and torsion spring 6 is housed on bearing pin 8, one end of torsion spring 6 is pressed on the valve gap 7, valve body 1 is a conical contact surface with the contact surface of valve gap 7, is provided with O RunddichtringO 4 on this taper seat.Valve gap 7 can be selected ball type of contact surface or conical contact surface with the contact surface of valve body 1.For guaranteeing sealing performance, on valve body 1, be provided with O RunddichtringO 2, guarantee the sealing performance between valve body 1 and sleeve pipe.
Use of the present utility model is: the spool that the suitable dimension grout hole is arranged according to selections such as casing programme, mud properties, the assembling back connects with casing coupling, together in the lower going-into-well, at this moment drilling fluid is because pressure differential and grout hole by spool 5 pours in the sleeve pipe automatically, as being hampered or meeting when card midway, but the turn on pump circulation.After having descended sleeve pipe, the good mud of circular treatment, connecing the pressing steel balls of will spraining before the cementing head drops in the sleeve pipe, turn on pump is cut off and is cut off 3, and spool 5 is ejected outside the valve body 1, and have one-way sealing function from irritating valve this moment, the intact back of cementing operation is because the pressure differential that cement paste causes and the effect of torsion spring 6, promote 7 of valve gaps and on " O " RunddichtringO 4, played the effect of one-way sealing, and reached the purpose of well cementation.
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 be structural representation of the present utility model,
As shown in Figure 1, the utility model is made up of valve body 1, spool 5 and valve gap 7, and valve body 1 left end is the cover pipe thread, on the right side of cover pipe thread O RunddichtringO 2 is housed, and an end of spool 5 cuts off 3 by two and is fixed in the valve body 1.Valve gap 7, torsion spring 6, support plate 10, journal stirrup 9, bearing pin 8 formed the one-way sealing devices, and support plate 10 and valve gap 7 be for being welded to connect, among the figure double dot dash line represent to cut off 3 cut off after, contact with valve body 1 situation of realization one-way sealing of valve gap 7.The valve gap 7 of present embodiment is a ball type of contact surface with the contact surface of valve body 1, has guaranteed one-way sealing property.O RunddichtringO 4 is contained in the seal groove that is positioned at valve body 1 taper surface.
Its operating principle is described below in conjunction with design feature of the present utility model:
In the setting of casing process, mud is under the effect of pressure reduction, from the grout hole of spool 5, pour in the sleeve pipe, for guaranteeing the grouting effect ideal, spool design is interchangeable, the spool that the suitable dimension grout hole is promptly arranged according to selections such as casing programme, mud properties since adopt large scale, single, directly irritate the grout hole of formula, grouting effect is excellent.In case grout hole takes place to be stopped up; after pressure reduction in annular space and the sleeve pipe surpasses certain numerical value; cutting off 3 is cut off; spool 5 is pushed in the upper sleeve; valve gap 7 is pushed " O " RunddichtringO 4 to and is realized one-way sealing under the effect of pressure reduction, stop mud to enter in the sleeve pipe, guarantees the annular space liquid-column height; guarantee downhole safety, therefore the utlity model has auto-lock function.Setting of casing drops into steel ball to the predetermined well depth of emptying, and turn on pump cuts off 3 and cut off, spool 5 is pushed to down in the parts casing pipe, valve gap 7 and " O " RunddichtringO 4 are realized one-way sealings, and what guaranteed to determine in the sleeve pipe empties＜i.e. design empty height 〉, thereby the utlity model has safety and empty function.Valve gap 7 is selected the processing of high-quality steel for use, adopts spherical sealing surface, has guaranteed one-way sealing property.Flow out in the grout hole of setting of casing process middle-opening pump mud by spool 5, can not influence grouting and one-way sealing property.After having descended sleeve pipe, the good mud of circular treatment, drop into the pressing steel balls of spraining before connecing cementing head, turn on pump is cut off and is cut off 3, and spool 5 is pushed in the valve body lower portion sleeve pipe, and promptly have one-way sealing property from irritating valve this moment, cementing and replaced mud after, under the effect of cement paste pressure reduction and torsion spring 6, valve gap 7 is pushed to sealing ring 4, realizes one-way sealing.For guaranteeing sealing performance, on valve body 1, designed " O " RunddichtringO 2, guarantee the sealing performance between valve body 1 and sleeve pipe.
The utility model has the advantages that simple in structure, grouting efficiency is high, one-way sealing property good, and have auto-lock function and safety empty function, be a kind of comparatively ideal Self-filling casing back-pressure valve.
Claims (4)
1, a kind of self filling type sleeve pipe back-pressure valve, it is characterized in that it is made up of valve body 1, spool 5 and valve gap 7, the grout hole of spool 5 is straight filling formula grout hole, one end of spool 5 is fixed in the valve body 1 by cutting off 3, the other end jack-up valve gap 7 of spool 5, valve gap 7 is contained on the journal stirrup 9 on valve body 1 side by support plate 10 and bearing pin 8, and torsion spring 6 is housed on bearing pin 8, one end of torsion spring 6 is pressed on the valve gap 7, valve body 1 is a conical contact surface with the contact surface of valve gap 7, is provided with O RunddichtringO 4 on this taper seat.
2, back-pressure valve according to claim 1 is characterized in that the valve gap 7 and the contact surface of valve body 1 are ball type of contact surface.
3, back-pressure valve according to claim 1 is characterized in that the valve gap 7 and the contact surface of valve body 1 are conical contact surface.
4,, it is characterized in that on valve body 1, being equipped with O RunddichtringO 2 according to claim 1 or 2 or 3 described back-pressure valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95203304 CN2216141Y (en) | 1995-01-26 | 1995-01-26 | Self-filling casing back-pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95203304 CN2216141Y (en) | 1995-01-26 | 1995-01-26 | Self-filling casing back-pressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2216141Y true CN2216141Y (en) | 1995-12-27 |
Family
ID=33856194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95203304 Expired - Fee Related CN2216141Y (en) | 1995-01-26 | 1995-01-26 | Self-filling casing back-pressure valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2216141Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993855A (en) * | 2014-05-07 | 2014-08-20 | 中国石油化工集团公司 | Well drilling and well cementation mud-backflow-preventing device |
-
1995
- 1995-01-26 CN CN 95203304 patent/CN2216141Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993855A (en) * | 2014-05-07 | 2014-08-20 | 中国石油化工集团公司 | Well drilling and well cementation mud-backflow-preventing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |