CN202370965U - Positioning screw special for outer centralizer for low stress damage type casing pipe - Google Patents
Positioning screw special for outer centralizer for low stress damage type casing pipe Download PDFInfo
- Publication number
- CN202370965U CN202370965U CN2011205512898U CN201120551289U CN202370965U CN 202370965 U CN202370965 U CN 202370965U CN 2011205512898 U CN2011205512898 U CN 2011205512898U CN 201120551289 U CN201120551289 U CN 201120551289U CN 202370965 U CN202370965 U CN 202370965U
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- Prior art keywords
- nut
- screw
- centralizer
- low stress
- stress damage
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Abstract
The utility model relates to the technical field of positioning screws and discloses a positioning screw special for an outer centralizer for a low stress damage type casing pipe. The positioning screw comprises a screw and a nut, wherein the upper end of the screw and the nut are fixedly connected with each other; a groove is formed at the lower end of the screw; and the conical groove has a narrow upper part and a wide lower part. The positioning screw has a reasonable and compact structure and is convenient to use; the groove of the screw ensures that two fulcrums are formed between the screw and a casing string, the contact pressure is increased and the formed frictional resistance is increased, so that the positioning force provided by the centralizer is improved, and the positioning screw has high stability; and meanwhile, a stressed point is divided into two fulcrums, and is dispersed when the force is applied to the positioning screw, so that the casing string cannot be extruded and damaged easily.
Description
Technical field
the utility model relates to the positioning screwn technical field, is the special-purpose positioning screwn of a kind of outer centralizer of low stress damage molded cannula.
Background technique
for improving the centralizer of completion casing post in well, need install centralizer additional on casing string in the oil gas well drilling process; The location of centralizer on casing string relies on positioning ring or positioning screwn to realize; The structure of positioning ring is complicated, and manufacture cost is higher; The positioning screwn structure is simpler; Only need the correct position on centralizer; Get out screw, after screwing in screw, the centralizer fixed position of on casing string, the designing screw of screwing; The surface friction drag that utilizes the pressure between screw end and casing string outer surface to form is realized the location of centralizer on casing string; Plain screw commonly used at present, its end construction are divided into flush end and two kinds at tip; But the screw of these two kinds of end constructions is when being applied to the location of centralizer on casing string; Between screw and casing string, has only a fulcrum; Make that like this contact pressure between screw and the casing string is lower; The surface friction drag that forms is less, and less for the detent force that centralizer provides, the centralizer position stability is poor; The screw of cutting-edge structure because its force bearing point is concentrated, makes the casing string extruding impaired easily simultaneously.
Summary of the invention
the utility model provides a kind of outer centralizer of low stress damage molded cannula special-purpose positioning screwn; Overcome the deficiency of above-mentioned existing technology; It can effectively solve the employing plain screw; Make the position stability difference and employing most advanced and sophisticated get plain screw of centralizer, make the impaired problem of casing string extruding easily with respect to casing string.
The technological scheme of
the utility model realizes through following measure: the special-purpose positioning screwn of a kind of outer centralizer of low stress damage molded cannula comprises screw rod and nut; The upper end and the fixed by nut of screw rod link together; Lower end at screw rod is fluted.
Be to the further optimization of above-mentioned model utility technological scheme below or/and improve:
above-mentioned groove can be up-narrow and down-wide conical socket.
Annular groove can be arranged at the top of
above-mentioned screw rod.
above-mentioned nut can adopt hexagon head nut or crosshead nut or square nut or interior hexagon nut.
the utility model reasonable and compact in structure, easy to use; The groove of screw rod makes and forms two fulcrums between screw rod and the casing string, and contact pressure is increased, and the surface friction drag of formation increases, thereby improves the detent force that centralizer provides, and stability is strong; Force bearing point is divided into two fulcrums simultaneously, and when the utility model was exerted oneself, force bearing point disperseed, and is difficult for making the casing string extruding impaired.
Description of drawings
accompanying drawing 1 is looked the broken section structural representation for the master of the utility model most preferred embodiment.
Coding in
accompanying drawing is respectively: 1 is screw rod, and 2 is nut, and 3 is groove, and 4 is annular groove.
Embodiment
the utility model does not receive following embodiment's restriction, can confirm concrete mode of execution according to the technological scheme and the actual conditions of the utility model.
Below in conjunction with embodiment and accompanying drawing the utility model is further described:
shown in accompanying drawing 1, the special-purpose positioning screwn of this outer centralizer of low stress damage molded cannula comprises screw rod 1 and nut 2; The upper end of screw rod 1 and nut 2 are fixed together; In the lower end of screw rod 1 fluted 3.Through the utility model centralizer is located on casing string, the tapped hole that centralizer is passed in the lower end of screw rod 1 withstands on the outside of casing string; In this process, form two fulcrums between screw rod 1 and the casing string, contact pressure is increased, the surface friction drag of formation increases, thereby improves the detent force of centralizer, and stability is strong; Force bearing point is divided into two fulcrums simultaneously, when the utility model is exerted oneself, is difficult for producing stress and concentrates, and make the casing string extruding impaired.
Can according to actual needs the special-purpose positioning screwn of the above-mentioned outer centralizer of low stress damage molded cannula be done further to optimize or/and improve:
shown in accompanying drawing 1, groove 3 is up-narrow and down-wide conical socket.Be convenient to the processing of groove 3 like this.
shown in accompanying drawing 1, have annular groove 4 on the top of screw rod 1.When the top of screw rod 1 and nut 2 receive the external force extruding, screw rod 1 can be cut off at annular groove 4 places, guarantees that screw rod 1 bottom contacts with the sleeve pipe contact segment all the time, plays location and supporting effect to centralizer.
as required, nut 2 adopts hexagon head nut or crosshead nut or square nut or interior hexagon nuts.
above technical characteristics has constituted the most preferred embodiment of the utility model, and it has stronger adaptability and best implementation result, can increase and decrease non-essential technical characteristics according to actual needs, satisfies the demand of different situations.
Claims (5)
1. the special-purpose positioning screwn of the outer centralizer of low stress damage molded cannula is characterized in that comprising screw rod and nut; The upper end and the fixed by nut of screw rod link together; Lower end at screw rod is fluted.
2. the special-purpose positioning screwn of the outer centralizer of low stress damage molded cannula according to claim 1 is characterized in that groove is up-narrow and down-wide conical socket.
3. the special-purpose positioning screwn of the outer centralizer of low stress damage molded cannula according to claim 1 and 2 is characterized in that annular groove is arranged at the top of screw rod.
4.. the special-purpose positioning screwn of the outer centralizer of low stress damage molded cannula according to claim 1 and 2 is characterized in that nut adopts hexagon head nut or crosshead nut or square nut or interior hexagon nut.
5. the special-purpose positioning screwn of the outer centralizer of low stress damage molded cannula according to claim 3 is characterized in that nut adopts hexagon head nut or crosshead nut or square nut or interior hexagon nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205512898U CN202370965U (en) | 2011-12-26 | 2011-12-26 | Positioning screw special for outer centralizer for low stress damage type casing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205512898U CN202370965U (en) | 2011-12-26 | 2011-12-26 | Positioning screw special for outer centralizer for low stress damage type casing pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202370965U true CN202370965U (en) | 2012-08-08 |
Family
ID=46594669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205512898U Expired - Lifetime CN202370965U (en) | 2011-12-26 | 2011-12-26 | Positioning screw special for outer centralizer for low stress damage type casing pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202370965U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104514793A (en) * | 2014-11-27 | 2015-04-15 | 苏州速腾电子科技有限公司 | Precision outer-diameter inner-circle positioning bolt |
| CN105026774A (en) * | 2013-01-31 | 2015-11-04 | 空中客车营运有限公司 | Fastener |
| CN110159633A (en) * | 2019-06-04 | 2019-08-23 | 海盐鼎丰紧固件有限公司 | A kind of high-strength bolt for being not easy to twist into two parts |
-
2011
- 2011-12-26 CN CN2011205512898U patent/CN202370965U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105026774A (en) * | 2013-01-31 | 2015-11-04 | 空中客车营运有限公司 | Fastener |
| CN104514793A (en) * | 2014-11-27 | 2015-04-15 | 苏州速腾电子科技有限公司 | Precision outer-diameter inner-circle positioning bolt |
| CN110159633A (en) * | 2019-06-04 | 2019-08-23 | 海盐鼎丰紧固件有限公司 | A kind of high-strength bolt for being not easy to twist into two parts |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |
|
| CX01 | Expiry of patent term |