CN107939335A - The well cementation double rubber plug systems of wear-resisting anti-backflow and application method - Google Patents
The well cementation double rubber plug systems of wear-resisting anti-backflow and application method Download PDFInfo
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- CN107939335A CN107939335A CN201711137889.8A CN201711137889A CN107939335A CN 107939335 A CN107939335 A CN 107939335A CN 201711137889 A CN201711137889 A CN 201711137889A CN 107939335 A CN107939335 A CN 107939335A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
Abstract
Include wear-resisting anti-backflow top cement plug, bottom plug, impacting seat and aerial drainage basket with the double rubber plug systems of wear-resisting anti-backflow and application method, system the invention discloses one kind well cementation；Fin and seal head are provided with wear-resisting anti-backflow top cement plug, self-locking tooth is provided with seal head, fin has back rake angle；The fin with back rake angle is provided with bottom plug；Impacting seat includes shell and self-locking impacting seat, and shell and self-locking impacting seat are axially through the sealing of self-locking impacting seat is fixed inside the shell, is provided with self-locking impacting seat inner wall and the matched self-locking structure of self-locking tooth on seal head；After the fin deformation of the bottom plug, the maximum outside diameter at bottom plug fin is less than self-locking impacting seat internal diameter；The aerial drainage basket cooperatively forms fluid passage in cementing operation with bottom plug.The present invention can realize being effectively isolated for cement mortar and front and rear mud in casing.
Description
Technical field
The invention discloses a kind of double rubber plug systems of wear-resisting anti-backflow for oil gas field cementing operation operation and user
Method, belongs to the manufacture of oil-gas field downhole operation instrument and using technical field.
Background technology
After spudder completes, in order to make can smoothly to produce from now on, it is necessary to carry out well cementing operation, but implementing
Before well cementing operation, due to there is the drilling mud for not returning out ground in well, implement conventional cementing operation, carry out water filling
Before and after mud, it is required for separating the mud of the mud in casing, the cement mortar of injection and replacement using rubber plug, keeps away
Exempt to cause the slurry of drilling mud and cementing slurry, reaching prevents cementing slurry from being occurred by the problem of drilling mud pollution.
The rubber plug in well is put under the promotion of well cementation pump fluid injection body, bruising at impacting seat is come downwards to from well head, is finally reached casing shoe
Place forms the effect of good cement sealing quality.
In the prior art, Chinese patent " 200810102991.9 " discloses a kind of Skidproof well cementing rubber plug, described anti-skidding solid
Well rubber plug includes：Chock plug, collet, the multistage plate-like wing and skid resistant course, are distributed with multiple pits or prominent on the lower surface of skid resistant course
Rise.In cementing job, the lower surface of skid resistant course and cements, for dimpled Skidproof well cementing rubber plug, cement meeting
It is filled into skid resistant course pit.Chinese patent " CN203603840U " discloses a kind of wear-resisting rubber plug of well cementation, and the well cementation is used
Wear-resisting rubber plug includes pedestal and rubber plug body, and the rubber plug body rear portion is cylindrical in shape in spherical or ellipsoid, front portion, and rubber plug body is anterior
It is connected on pedestal, fin is provided with the outer wall of rubber plug body front portion.After in the utility model sleeve pipe, side is contacted with tube wall
Face is larger, and due to the motive force of rubber plug top pumping liquid, can remain has larger contact force between side and tube wall
And contact area, form the automatic compensation effect after abrasion.
Existing conventional cementing rubber plug, mainly there is two types.One kind is single rubber plug, only a bruising rubber plug, during well cementation
Follow and entering behind cementing slurry for well, cement mortar and mud are isolated, and the cement mortar on casing wall is cleaned, then
With the impacting seat bruising in shaft bottom, " 200810102991.9 " disclose Skidproof well cementing rubber plug and " CN203603840U " is disclosed admittedly
Well belongs to such rubber plug with wear-resisting rubber plug, can control the length of cement plug.These rubber plugs in well cementation cannot to cement mortar and
Mud above is isolated, and cement mortar can form substantial amounts of slurry in casing with mud above, which ties in well cementation
The top of annular space is run to during beam, it is impossible to be frozen into the Behavior of Hardened Cement Paste of densification, influence the sealing quality on annular space top.
Another kind is double rubber plug, including bottom plug and top cement plug, and during well cementation, bottom plug is dropped in before cement mortar, on
Rubber plug is followed behind cement mortar, breakdown under bottom plug to certain pressure during impacting seat, can continue to inject cement mortar, top cement plug
During to impacting seat, runner is blocked, prevents from, for sky, ensureing cement plug length.Top cement plug and bottom plug all to cement mortar and mud into
Row isolation, and cleans the mud on casing wall and cement mortar, can to avoid cement mortar front and rear in casing
Slurry is formed with mud, had not only improved the cementing quality on annular space top, but also can guarantee that the accurate control of lower cement plug.
Single rubber plug for using at present and double rubber plugs, all there are technical deficiency, during the well cementation of scene, for various reasons,
Float collar is caused to fail sometimes, and since the density of annular space cement mortar is higher than the density of mud, annular pressure is higher than casing
Interior pressure, cement mortar will flow back, and rubber plug is fallen back, and causes lower cement plug overlength, and also increase is bored the plug time, meanwhile, annular space top
Cement mortar lacks, and leakage envelope, cementing quality is with regard to poor.Cemented the well using single rubber plug, cement mortar front portion just forms a large amount of slurries in pipe, fortune
Row arrives annular space top, also influences float collar quality.The above situation, can all give and bury hidden danger to later oil well production, even
Trigger well cementation accident.
The content of the invention
It is an object of the invention to overcome the above problem existing in the prior art, there is provided one kind well cementation is double with wear-resisting anti-backflow
Rubber plug system and application method.After sleeve pipe of the present invention, being effectively isolated for cement mortar and front and rear mud is realized in casing,
Particularly top cement plug, has wear automatic-compensation, and isolation effect is more excellent, can realize long horizontal sections well efficient isolation and
Tube wall cleans, and bottom plug is through impacting seat and then than puncturing, top cement plug and impacting seat bruising sealing self-locking, the reliable self-locking of single-stage,
Even if float collar fails, cement mortar will not flow back, so as to fulfill the accurate control of cement plug.
To achieve the above object, the technical solution adopted by the present invention is as follows：
One kind well cementation double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：Including wear-resisting anti-backflow top cement plug, bottom plug, touch
Wedge and aerial drainage basket；Fin and seal head are provided with wear-resisting anti-backflow top cement plug, self-locking tooth, fin tool are provided with seal head
There is back rake angle；The fin with back rake angle is provided with bottom plug；Impacting seat includes shell and self-locking impacting seat, shell and self-locking
Impacting seat is fixed inside the shell axially through the sealing of, self-locking impacting seat, be provided with self-locking impacting seat inner wall with seal head
The matched self-locking structure of self-locking tooth；After the fin deformation of the bottom plug, the maximum outside diameter at bottom plug fin is less than certainly
Lock impacting seat internal diameter；The aerial drainage basket cooperatively forms fluid passage in cementing operation with bottom plug.
The wear-resisting anti-backflow top cement plug includes wear-resisting rubber plug body, top cement plug core, self-locking tooth and seal head, wear-resisting rubber plug body
On be provided with multiple fins with back rake angle, wear-resisting rubber plug body is fixed and is set on top cement plug core, seal head and top cement plug core
It is fixedly connected.
Be arranged at intervals with multiple annular grooves on the top cement plug outer core, wear-resisting rubber plug body correspond to annular groove be provided with it is multiple
Raised line, wear-resisting rubber plug body are embedded in annular groove by raised line and vulcanize on top cement plug core.
The wear-resisting rubber plug body rear portion is in sphere or spheroid, and front portion is in cylinder, be arranged at intervals with cylinder it is multiple have after
The fin at inclination angle.
The seal head is threadedly attached in the front end of top cement plug core, and seal head front portion is hollow cone cylinder, and rear end is
Blind end, is provided with annular groove on the cylinder of hollow cone cylinder, sealing ring I is provided with annular groove.
The self-locking tooth is cylindrical, and the inner cylinder face front end of self-locking tooth is in horn-like, and the outer wall of self-locking tooth is zigzag
Screw thread or multiple equidistant zigzag slots.
The bottom plug includes common rubber plug body and bottom plug core, is provided with common rubber plug body multiple with back rake angle
Fin, common rubber plug body are set on bottom plug core, and it is identical with bottom plug core outside diameter to be arranged rear common rubber plug body outside diameter.
The bottom plug core is cylindrical, and the head of bottom plug core is bulb, and annular groove, ring are provided with bottom plug core
External screw thread is provided with connected in star, common rubber plug body insertion vulcanization is on the external screw thread of bottom plug core annular groove.
The top of the aerial drainage basket is formed in the annular shape of middle perforate, bottom opening, side wall by more ribs, more muscle
Bar is connected to form aerial drainage basket with top and bottom.
A kind of application method cemented the well with the double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：
Casing string structure, is followed successively by from top to bottom：Guide shoe+casing shoe+float collar or float shoe+bunch tube+float collar+aerial drainage basket+casing
String+impacting seat+bunch tube, impacting seat are located at the tip position of cement plug；
During the well cementation of scene, casing string structure is lowered into well, after carrying out cementing operation preparation, insulating liquid before first injecting, then
Bottom plug is put into, reinjects cement mortar；
After cement mortar has been noted, wear-resisting anti-backflow top cement plug is put into, is then replaced into mud, when bottom plug runs to impacting seat, commonly
Fin on rubber plug body deforms, and bottom plug is continued to run with integrally through impacting seat, general when bottom plug runs to aerial drainage basket
The bulb of logical rubber plug body enters in the perforate of aerial drainage basket, fin is turned down forward, forms fluid passage；
Continue for slurry, cement mortar is by bottom plug, aerial drainage basket, into annular space, when wear-resisting anti-backflow top cement plug runs to impacting seat
When, seal head enters bruising self-locking in self-locking impacting seat, and self-locking tooth is stuck in self-locking impacting seat, and cementing operation terminates.
Advantage using the present invention is：
First, rubber plug body side surface and tube wall contact surface of the present invention are larger, under fluid power effect, have wear-compensating effect, and rubber plug
Good integrity, frictional resistance is smaller, so as to improve the isolation of rubber plug and cleaning effect in Holes of Complicated Wells and long horizontal sections well, realizes cement plug
Accurate control, saves and bores the plug time.
2nd, in the present invention, the bottom plug includes common rubber plug body and bottom plug core, and common rubber plug body is multiple to be provided with
（General 4~5）There is the cylinder of the fin of back rake angle, the bottom plug core middle part sets external screw thread, the common rubber plug
On the external screw thread in bottom plug core centre position, the bottom plug stable structure is reliable, can be partitioned into cementing slurry for well for body insertion vulcanization
With mud above, prevent cement mortar from forming slurry in pipe with mud above, the cementing quality on annular space top can be improved.
3rd, in the present invention, the bottom plug cylinder outside diameter is significantly less than the diameter of self-locking impacting seat inner cylinder face, described to let out
The basket shape structure that stream basket links together the bottom of the annulus at top and middle perforate by more ribs for a side wall, should
The advantages of structure, is that bottom plug can pass through impacting seat, is then blocked by aerial drainage basket, and the fin of bottom plug is overturned, and is kept away
Exempt from bottom plug and run to float collar position to block pipe inner flow passage, so as to keep pipe inner flow passage unimpeded, ensure that cement mortar is smoothly replaced into ring
It is empty.
4th, in the present invention, the bottom plug cylinder outside diameter is significantly less than the diameter of self-locking impacting seat inner cylinder face, it is described on
The front end of rubber plug core is connected with seal head and self-locking tooth, and seal head and self-locking tooth coordinate with self-locking impacting seat.The advantages of structure
It is, bottom plug can pass through impacting seat, wear-resisting anti-backflow top cement plug and impacting seat single-stage bruising self-locking, better reliability,
Seal pressure higher, can prevent that cement mortar flows back when float collar from failing, and adapts to big pressure difference special cementing, so as to ensure lower cement
The accurate control of plug, prevents cement mortar refluxing annulus top cement mortar missing, improves cementing quality, also avoid cement mortar reflux from arranging
Shi Gaosai, saves and bores the plug time.
5th, in the present invention, the aerial drainage basket is for a side wall by more ribs the annulus at top and the bottom of middle perforate
The basket shape structure that portion links together, mouth down are inverted and are placed in the casing on float collar, can avoid bottom plug directly with floating
Float collar hydrophthalmia is blocked in hoop contact.
To sum up, the present invention can realize when cementing the well in casing cement mortar and mud above and mud below carry out respectively every
From top cement plug has wear automatic-compensation, and isolation effect is more excellent, adapts to being effectively isolated for long horizontal sections well, gluing
Plug can seal self-locking with impacting seat bruising, can effectively prevent cement mortar reflux, can improve cementing quality, accurately control cement plug.
Brief description of the drawings
Fig. 1 is the wear-resisting anti-backflow top cement plug structure diagram of the present invention；
Fig. 2 is bottom plug structure diagram of the present invention；
Fig. 3 is impacting seat structure diagram of the present invention；
Fig. 4 is aerial drainage basket structure diagram of the present invention；
Fig. 5 is the wear-resisting anti-backflow top cement plug of the present invention and the structure diagram after impacting seat bruising self-locking.
In figure mark for：1st, wear-resisting anti-backflow top cement plug, 2, bottom plug, 3, impacting seat, 4, aerial drainage basket, 5, wear-resisting rubber plug
Body, 6, top cement plug core, 7, self-locking tooth, 8, seal head, 9, sealing ring I, 10, common rubber plug body, 11, bottom plug core, 12, shell,
13rd, self-locking impacting seat, 14, sealing ring II.
Embodiment
Embodiment 1
One kind well cementation wear-resisting anti-backflow pair rubber plug systems, including wear-resisting anti-backflow top cement plug 1, bottom plug 2, impacting seat 3 and let out
Flow basket 4；Fin and seal head 8 are provided with wear-resisting anti-backflow top cement plug 1, self-locking tooth 7 is provided with seal head 8, fin has
Back rake angle；The fin with back rake angle is provided with bottom plug 2；Impacting seat 3 includes shell 12 and self-locking impacting seat 13, shell 12
With self-locking impacting seat 13 axially through the sealing of self-locking impacting seat 13 is fixed in shell 12, is set on 13 inner wall of self-locking impacting seat
It is equipped with and the 7 matched self-locking structure of self-locking tooth on seal head 8；After the fin deformation of the bottom plug 2,2 fin of bottom plug
The maximum outside diameter at place is less than 13 internal diameter of self-locking impacting seat；The aerial drainage basket 4 cooperatively forms fluid in cementing operation with bottom plug 2
Passage.
The wear-resisting anti-backflow top cement plug 1 includes wear-resisting rubber plug body 5, top cement plug core 6, self-locking tooth 7 and seal head 8, wear-resisting
Multiple fins with back rake angle are provided with rubber plug body 5, wear-resisting rubber plug body 5 is fixed and is set on top cement plug core 6, seal head 8
It is fixedly connected with top cement plug core 6.
Multiple annular grooves are arranged at intervals with 6 outer wall of top cement plug core, the wear-resisting correspondence of rubber plug body 5 annular groove is provided with more
A raised line, wear-resisting rubber plug body 5 are embedded in annular groove by raised line and vulcanize on top cement plug core 6.
5 rear portion of wear-resisting rubber plug body is in sphere or spheroid, and front portion is in cylinder, be arranged at intervals with cylinder it is multiple have after
The fin at inclination angle.
The seal head 8 is threadedly attached in the front end of top cement plug core 6, and the front portion of seal head 8 is hollow cone cylinder, rear end
For blind end, annular groove is provided with the cylinder of hollow cone cylinder, sealing ring I9 is provided with annular groove.
The self-locking tooth 7 is cylindrical, and the inner cylinder face front end of self-locking tooth 7 is in horn-like, and the outer wall of self-locking tooth 7 is sawtooth
Shape screw thread or multiple equidistant zigzag slots.
The bottom plug 2 includes common rubber plug body 10 and bottom plug core 11, and being provided with common rubber plug body 10 multiple has
The fin of back rake angle, common rubber plug body 10 are set on bottom plug core 11, and are arranged rear common 10 outside diameter of rubber plug body and bottom plug
11 outside diameter of core is identical.
The bottom plug core 11 is cylindrical, and the head of bottom plug core 11 is bulb, and annular is provided with bottom plug core 11
Groove, external screw thread, external screw thread of the common insertion of rubber plug body 10 vulcanization in 11 annular groove of bottom plug core are provided with annular groove
On.
The top of the aerial drainage basket 4 is formed in the annular shape of middle perforate, bottom opening, side wall by more ribs, more
Rib is connected to form aerial drainage basket with top and bottom.
A kind of application method cemented the well with the double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：
Casing string structure, is followed successively by from top to bottom：Guide shoe+casing shoe+float collar or float shoe+bunch tube+float collar+aerial drainage basket+casing
String+impacting seat+bunch tube, impacting seat are located at the tip position of cement plug；
During the well cementation of scene, casing string structure is lowered into well, after carrying out cementing operation preparation, insulating liquid before first injecting, then
Bottom plug is put into, reinjects cement mortar；
After cement mortar has been noted, wear-resisting anti-backflow top cement plug is put into, is then replaced into mud, when bottom plug runs to impacting seat, commonly
Fin on rubber plug body deforms, and bottom plug is continued to run with integrally through impacting seat, general when bottom plug runs to aerial drainage basket
The bulb of logical rubber plug body enters in the perforate of aerial drainage basket, fin is turned down forward, forms fluid passage；
Continue for slurry, cement mortar is by bottom plug, aerial drainage basket, into annular space, when wear-resisting anti-backflow top cement plug runs to impacting seat
When, seal head enters bruising self-locking in self-locking impacting seat, and self-locking tooth is stuck in self-locking impacting seat, and cementing operation terminates.
Embodiment 2
As shown in the figure, a kind of well cementation wear-resisting anti-backflow pair rubber plug systems, including wear-resisting anti-backflow top cement plug 1, bottom plug 2, touch
Wedge 3, aerial drainage basket 4, wear-resisting anti-backflow top cement plug 1 include wear-resisting rubber plug body 5, top cement plug core 6, self-locking tooth 7 and seal head 8 etc.,
Bottom plug 2 includes common rubber plug body 10 and bottom plug core 11, and impacting seat 3 includes shell 12 and self-locking impacting seat 13.It is described wear-resisting
5 rear portion of rubber plug body is in sphere or spheroid, and front portion is in cylinder, and multiple fins for having back rake angle are arranged at intervals with cylinder, described
6 external rear wall of top cement plug core is arranged at intervals with multiple annular grooves, and anterior outer wall is cone cylinder, and wear-resisting rubber plug body insertion vulcanization is upper
On rubber plug core 6.
The seal head 8 is threadedly attached in the front end of top cement plug core 6, and the front portion of seal head 8 is hollow cone cylinder,
Annular groove is provided with the cylinder of hollow cone cylinder, sealing ring I9 is provided with annular groove.
Big angle is fallen in the inner cylinder face front end of the self-locking tooth 7, and the outer wall of the self-locking tooth 7 is saw-tooth thread or multiple etc.
Away from zigzag slot, 7 side wall of self-locking tooth is axially provided with perforation notch, and the self-locking tooth 7 is installed on the middle part of seal head 8
On small cylindrical surface, the small cylindrical surface and the anterior cylinder conical surface at the middle part of seal head 8 are excessive.
The self-locking impacting seat 13 is provided with sealing ring II14, the self-locking bruising by being threadably mounted in shell
13 inner cylinder faces of seat are relatively large in diameter, and big angle is fallen in the rear end of inner cylinder face, is additionally provided with inner wall cylindrical surface mutual with seal head
The saw-tooth thread of cooperation or multiple equidistant zigzag skewed slots.
The common rubber plug body 10 is multiple to be provided with（General 4~5）There are the cylinder of the fin of back rake angle, the lower glue
Fill in 11 middle part of core and external screw thread is set, its head is bulb（Or frustum forming head）, its afterbody is cylinder, the common glue
The cylinder outside diameter of cock body 10 is consistent with the bulb outside diameter of the cylinder of the afterbody of bottom plug core 11 and head, and is significantly less than self-locking and touches
The diameter of 13 inner cylinder face of wedge, the common insertion of rubber plug body 10 vulcanization is on the external screw thread in 11 centre position of bottom plug core.
The aerial drainage basket 4 links together the bottom of the annulus at top and middle perforate by more ribs for a side wall
Basket shape structure.
A kind of application method cemented the well with the double rubber plug systems of wear-resisting anti-backflow, onsite application casing string structure, from top to bottom
It is followed successively by：Guide shoe+casing shoe+float collar（Float shoe）+ bunch tube+float collar+aerial drainage basket 4（Mouth down is inverted）+ bunch tube+impacting seat 3+
Bunch tube, impacting seat 3 are placed in the tip position of cement plug, when scene is cemented the well, are lowered into well, do by above-mentioned casing string structure
After good cementing operation prepares, insulating liquid before first injecting, then puts into bottom plug 2, reinjects cement mortar, after cement mortar has been noted, throws
Enter wear-resisting anti-backflow top cement plug 1, then replace into mud, when bottom plug 2 runs to impacting seat 3, the fin on common rubber plug body 10
The deformation of bigger occurs, bottom plug 2 is continued to run with integrally through impacting seat 3, when bottom plug 2 runs to aerial drainage basket 4, common rubber plug
Fin on body 10 turns down forward, forms fluid passage, continues for slurry, cement mortar is by bottom plug 2, aerial drainage basket 4, into ring
Sky, when wear-resisting anti-backflow top cement plug 1 runs to impacting seat 3, seal head 8 enters in self-locking impacting seat 13, and self-locking tooth 7 is stuck in certainly
Lock in impacting seat 13, as shown in figure 5, seal head 8 realizes that bruising self-locking bidirectional seals with impacting seat 3, so as to fulfill cementing operation
Positive bruising and direction anti-backflow, cementing operation terminate.
Claims (10)
1. one kind well cementation double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：Including wear-resisting anti-backflow top cement plug（1）, lower glue
Plug（2）, impacting seat（3）With aerial drainage basket（4）；Wear-resisting anti-backflow top cement plug（1）On be provided with fin and seal head（8）, seal head
（8）On be provided with self-locking tooth（7）, fin has back rake angle；Bottom plug（2）On be provided with the fin with back rake angle；Impacting seat
（3）Including shell（12）With self-locking impacting seat（13）, shell（12）With self-locking impacting seat（13）Axially through self-locking impacting seat
（13）Sealing is fixed on shell（12）It is interior, self-locking impacting seat（13）It is provided with inner wall and seal head（8）On self-locking tooth（7）Phase
The self-locking structure of cooperation；The bottom plug（2）Fin deformation after, bottom plug（2）Maximum outside diameter at fin is touched less than self-locking
Wedge（13）Internal diameter；The aerial drainage basket（4）In cementing operation and bottom plug（2）Cooperatively form fluid passage.
2. the well cementation according to claim 1 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The wear-resisting anti-backflow
Top cement plug（1）Including wear-resisting rubber plug body（5）, top cement plug core（6）, self-locking tooth（7）And seal head（8）, wear-resisting rubber plug body（5）On set
It is equipped with multiple fins with back rake angle, wear-resisting rubber plug body（5）Fixation is set in top cement plug core（6）On, seal head（8）With gluing
Fill in core（6）It is fixedly connected.
3. the well cementation according to claim 2 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The top cement plug core
（6）Multiple annular grooves, wear-resisting rubber plug body are arranged at intervals with outer wall（5）Corresponding annular groove is provided with multiple raised lines, wear-resisting rubber plug
Body（5）Annular groove is embedded in by raised line and is vulcanized in top cement plug core（6）On.
4. the well cementation according to claim 3 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The wear-resisting rubber plug body
（5）Rear portion is in sphere or spheroid, and front portion is in cylinder, and multiple fins for having back rake angle are arranged at intervals with cylinder.
5. the well cementation according to claim 4 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The seal head（8）
It is threadedly attached in top cement plug core（6）Front end, seal head（8）Front portion is hollow cone cylinder, and rear end is blind end, hollow cone
Annular groove is provided with the cylinder of cylinder, sealing ring I is provided with annular groove.
6. the well cementation according to claim 5 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The self-locking tooth（7）
It is cylindrical, self-locking tooth（7）Inner cylinder face front end be in horn-like, self-locking tooth（7）Outer wall be saw-tooth thread or multiple etc.
Away from zigzag slot.
7. the well cementation according to claim 6 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The bottom plug（2）
Including common rubber plug body（10）With bottom plug core（11）, common rubber plug body（10）On be provided with multiple fins with back rake angle,
Common rubber plug body（10）It is set in bottom plug core（11）On, and it is arranged rear common rubber plug body（10）Outside diameter and bottom plug core（11）Outside
Footpath is identical.
8. the well cementation according to claim 7 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The bottom plug core
（11）It is cylindrical, bottom plug core（11）Head be bulb, bottom plug core（11）On be provided with annular groove, in annular groove
It is provided with external screw thread, common rubber plug body（10）Embedded vulcanization is in bottom plug core（11）On the external screw thread of annular groove.
9. the well cementation according to claim 8 double rubber plug systems of wear-resisting anti-backflow, it is characterised in that：The aerial drainage basket（4）
Top be in middle perforate annular shape, bottom opening, side wall formed by more ribs, and more ribs are connected with top and bottom
Form aerial drainage basket（4）.
10. a kind of application method cemented the well with the double rubber plug systems of wear-resisting anti-backflow according to claim 1, its feature exist
In：
Casing string structure, is followed successively by from top to bottom：Guide shoe+casing shoe+float collar or float shoe+bunch tube+float collar+aerial drainage basket+casing
String+impacting seat+bunch tube, impacting seat are located at the tip position of cement plug；
During the well cementation of scene, casing string structure is lowered into well, after carrying out cementing operation preparation, insulating liquid before first injecting, then
Bottom plug is put into, reinjects cement mortar；
After cement mortar has been noted, wear-resisting anti-backflow top cement plug is put into, is then replaced into mud, when bottom plug runs to impacting seat, commonly
Fin on rubber plug body deforms, and bottom plug is continued to run with integrally through impacting seat, general when bottom plug runs to aerial drainage basket
The bulb of logical rubber plug body enters in the perforate of aerial drainage basket, fin is turned down forward, forms fluid passage；
Continue for slurry, cement mortar is by bottom plug, aerial drainage basket, into annular space, when wear-resisting anti-backflow top cement plug runs to impacting seat
When, seal head enters bruising self-locking in self-locking impacting seat, and self-locking tooth is stuck in self-locking impacting seat, and cementing operation terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711137889.8A CN107939335B (en) | 2017-11-16 | 2017-11-16 | Wear-resistant anti-backflow double-rubber-plug system for well cementation and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711137889.8A CN107939335B (en) | 2017-11-16 | 2017-11-16 | Wear-resistant anti-backflow double-rubber-plug system for well cementation and using method |
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| Publication Number | Publication Date |
|---|---|
| CN107939335A true CN107939335A (en) | 2018-04-20 |
| CN107939335B CN107939335B (en) | 2020-09-25 |
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|---|---|---|---|
| CN201711137889.8A Active CN107939335B (en) | 2017-11-16 | 2017-11-16 | Wear-resistant anti-backflow double-rubber-plug system for well cementation and using method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720092A (en) * | 2020-07-03 | 2020-09-29 | 常熟市石油固井工具有限公司 | Spherical high-pressure rubber plug for well cementation operation |
| CN113010132A (en) * | 2021-03-24 | 2021-06-22 | 成都维泰油气能源技术有限公司 | Auxiliary system and method for intelligent well control |
| US11828132B2 (en) | 2022-02-28 | 2023-11-28 | Saudi Arabian Oil Company | Inflatable bridge plug |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111720092A (en) * | 2020-07-03 | 2020-09-29 | 常熟市石油固井工具有限公司 | Spherical high-pressure rubber plug for well cementation operation |
| CN113010132A (en) * | 2021-03-24 | 2021-06-22 | 成都维泰油气能源技术有限公司 | Auxiliary system and method for intelligent well control |
| CN113010132B (en) * | 2021-03-24 | 2023-04-18 | 成都维泰油气能源技术有限公司 | Auxiliary system and method for intelligent well control |
| US11828132B2 (en) | 2022-02-28 | 2023-11-28 | Saudi Arabian Oil Company | Inflatable bridge plug |
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