Well cementation compression packer
Technical field
The utility model relates to drilling technique field, in particular to a kind of well cementation compression packer.
Background technology
Conventionally packer is without permanent packing, and even needing can deblocking, carries out pipe string and trips out operation.Once setting but well cementation requires with compression packer, must form permanent packing effect, must not be because of pressure release in pit shaft, in pit shaft under the effect of other pressure and the tension force of packing element own and deblocking.Therefore need to once make packing element crimp, just no longer be subject to the impact of wellbore pressure for compression external casing packer design packing element anti-receding device for well cementation, realize sealed-for-life.But well cementation is with compression packer owing to limited by particular service requirement, and each part design limited space, can not adopt baroque system.
Therefore, need a kind of new well cementation compression packer, can realize permanent envelope every.
Utility model content
Technical problem to be solved in the utility model is, a kind of new well cementation compression packer is provided, can realize permanent envelope every.
In view of this; the utility model provides a kind of well cementation compression packer; comprise body, packing element and stopping means; described body is provided with sawtooth draw-in groove; described packing element is set on described body; described stopping means comprises a protection box and an elastic collar; described elastic collar is arranged in described protection box; described stopping means is arranged on one end of described packing element and described elastic collar and described protection box and is all set on described body, and the described packing element described elastic collar after envelope that rises coordinates to limit described packing element deblocking with described sawtooth draw-in groove.
In this technical scheme, protection box and elastic collar are arranged on the left side of packing element, between packing element and other assembly, adopt special construction design flexibility collar to coordinate with sawtooth draw-in groove, coordinate other devices of whole system to realize the sealed-for-life of packing element; After packing element rises by envelope, stop under the effect of packer other pressure and tension force of packing element own in pit shaft and deblocking, have simple in structure, easy to process, the feature that anti-back power is large.Sawtooth draw-in groove adopts the cooperation dovetail groove design identical with elastic collar, this kind of design is without using excessive groove depth just can obtain larger locked power, thereby can guarantee packer body intensity, after sawtooth draw-in groove coordinates with spacing jump ring, form forever locked, owing to adopting dovetail groove design, spacing jump ring can be under the effect of upper thrust distending, lose limit effect, tooth draw-in groove is according to design needs, the demand that adopts multilayer tooth slot structure to rise and seal to adapt to different hole diameters.Well cementation in the technical program utilizes stopping means to realize the object of packing element anti-back with compression packer, and it is simple in structure, easy to process.
As a kind of preferred embodiment, in described sawtooth draw-in groove, two inclined-planes of sawtooth are respectively 29~31 ° and 69~71 ° with respect to the angle of inclination of described body 1, for example, adopt the cooperation of 30 °, according to practical experience, and this angular range best results.
Accompanying drawing explanation
Fig. 1 and Fig. 2 are the structural representations under compression packer different conditions for new well cementation according to utility model embodiment;
Fig. 3 is the enlarged diagram that in Fig. 2, sawtooth draw-in groove coordinates with elastic collar.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.It should be noted that, in the situation that not conflicting, the application's embodiment and the feature in embodiment can combine mutually.
As shown in Figure 1, according to the well cementation compression packer of embodiment of the present utility model, comprise body 1, packing element 5 and stopping means, described body 1 is provided with sawtooth draw-in groove 2, described packing element 5 is set on described body 1, described stopping means comprises a protection box 4 and an elastic collar 3, described elastic collar 3 is arranged in described protection box 4, described stopping means is arranged on one end of described packing element 5 and described elastic collar 3 and described protection box 4 and is all set on described body 1, described packing element 5 rise envelope after described elastic collar 3 coordinate to limit described packing element 5 deblockings with described sawtooth draw-in groove 2.
In this technical scheme, protection box 4 and elastic collar 3 are arranged on the left side of packing element 5, between packing element 5 and other assembly 6, packing element 5 rises to be honored as a queen and forms the state shown in Fig. 2, elastic collar 3 coordinates other assembly 6 in compression packer for well cementation that withstands left side with sawtooth draw-in groove 2, restriction packing element 5 deblockings, realize forever setting; Adopt special construction design flexibility collar 3 to coordinate with sawtooth draw-in groove 2, coordinate other devices of whole system to realize the sealed-for-life of packing element; After packing element rises by envelope, stop under the effect of packer other pressure and tension force of packing element own in pit shaft and deblocking, have simple in structure, easy to process, the feature that anti-back power is large.Sawtooth draw-in groove 2 adopts the cooperation dovetail groove design identical with elastic collar 3, this kind of design is without using excessive groove depth just can obtain larger locked power, thereby can guarantee packer body intensity, after sawtooth draw-in groove 2 coordinates with spacing jump ring 3, form forever locked, owing to adopting dovetail groove design, spacing jump ring 3 can be under the effect of upper thrust distending, lose limit effect, tooth draw-in groove 2 is according to design needs, the demand that adopts multilayer tooth slot structure to rise and seal to adapt to different hole diameters.Well cementation in the technical program utilizes stopping means to realize the object of packing element anti-back with compression packer, and it is simple in structure, easy to process.
As a kind of preferred embodiment, in described sawtooth draw-in groove 2, two inclined-planes of sawtooth are respectively 29~31 ° and 69~71 ° with respect to the angle of inclination of described body 1, for example, adopt in Fig. 3 the cooperation of 30 °, according to practical experience, and this angular range best results.
In sum, content of the present utility model is not limited in the above-described embodiment, and those skilled in the art can propose other embodiment within technological guidance's thought of the present utility model, but within this embodiment is included in scope of the present utility model.