CN105822252B - Pipe string combination of cementing the well and cementing method - Google Patents
Pipe string combination of cementing the well and cementing method Download PDFInfo
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- CN105822252B CN105822252B CN201510002304.6A CN201510002304A CN105822252B CN 105822252 B CN105822252 B CN 105822252B CN 201510002304 A CN201510002304 A CN 201510002304A CN 105822252 B CN105822252 B CN 105822252B
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Abstract
A kind of well cementation pipe string combination of present invention offer and cementing method, well cementation pipe string combination includes float shoe, float collar, casing closing well sliding sleeve, hydraulic expanding packer and Duo Gen casings；Float shoe is placed on the lowermost end of well cementation pipe string combination；Float collar is placed on the upper end of float shoe, by casing connection between float collar and float shoe；Casing closing well sliding sleeve is placed on the upper end of float collar, by casing connection between casing closing well sliding sleeve and float collar；Hydraulic expanding packer is positioned over the upper end of casing closing well sliding sleeve, by casing connection between casing closing well sliding sleeve, hydraulic expanding packer is at least one group, include two hydraulic expanding packers in every group, one of them is positioned over the lower end of high pressure water layer, another is positioned over the upper end of high pressure water layer, by casing connection between hydraulic expanding packer；It is positioned on the hydraulic expanding packer of the upper end of high pressure water layer and places casing, casing connection to well head.
Description
Technical field
The present invention relates to reinforcing oil well technology more particularly to a kind of well cementation pipe string combination improving cementing quality and well cementation sides
Method.
Background technology
China's major part oil gas field is there are multilayer is developed on individual well longitudinal direction, and with the expansion again of exploration knowledge
Greatly, find that new oil-gas Layer is more and more having developed oil reservoir lower part, such as " Tahe is looked under Tahe " has become geology common recognition.
But since China major part oil field is developed using water filling body for mode, long-term injecting water causes part oil reservoir target zone high pressure to be rich in
Water.
It needs to cement the well when developing understratum, well cementation is empty to the annular between cylindrical shaft wall outside and well side by pipeline
Between injection proportion be more than mud slurries as a form of gel, mud is cemented out to and is consolidated the operation of cylindrical shaft wall from bottom to up.Gu
Well process is broadly divided into three steps：1, setting of casing；2, cementing；3, well head installation and casing pressure test.But in exploitation understratum
And when needing well cementation completion, since top Advance Water Injection early period straticulate exploration pressure is higher, cement slurry property cannot balance in advance
The strata pressure on water filling stratum causes water to immerse in cement mortar.Significant changes occur for cement slurry property, cause cementing quality poor, after
Phase pressure break packing property is poor, influences aerogenesis effect.
Currently, domestic and international project technical staff is mainly by adjusting the density of top cement mortar, to realize it is close evenly
Stressor layer, and then strata pressure is pushed down to realize, avoid water outlet from improving cementing quality.But this mode there are it is following not
Foot：First, if upper formation is there are lost-circulation zone, cement slurry density cannot infinitely expand, and can not complete equilibrium strata pressure
Requirement；Secondly, even if unavoidable formation fluid penetrates into cement mortar if generating the nearly balance pressure with stratum, from
And cement slurry property is caused to be deteriorated, influence cementing quality.
Invention content
A kind of well cementation pipe string combination of present invention offer and cementing method, can effectively insulate high pressure water layer, improve well cementation matter
Amount.
One aspect of the present invention provides a kind of well cementation pipe string combination, including：Float shoe, float collar, casing closing well sliding sleeve, hydraulic dilatation
Formula packer and Duo Gen casings；
Float shoe is placed on the lowermost end of well cementation pipe string combination；
Float collar is placed on the upper end of float shoe, by casing connection between float collar and float shoe；
Casing closing well sliding sleeve is placed on the upper end of float collar, by casing connection between casing closing well sliding sleeve and float collar；
Casing closing well sliding sleeve includes rubber plug, and the diameter of rubber plug is less than the interior of casing closing well sliding sleeve and hydraulic expanding packer
Diameter closes casing closing well sliding sleeve for replacing at liquid and operation to casing closing well sliding sleeve in well cementation pipe string combination；
Hydraulic expanding packer is positioned over the upper end of casing closing well sliding sleeve, is connected by casing between casing closing well sliding sleeve
It connects, it includes two hydraulic expanding packers that hydraulic expanding packer, which is at least in one group, every group, one of them is positioned over height
The lower end of water layer is pressed, another is positioned over the upper end of high pressure water layer, by casing connection between hydraulic expanding packer；
It is positioned on the hydraulic expanding packer of the upper end of high pressure water layer and places casing, one end of casing and be positioned over height
The hydraulic expanding packer connection of the upper end of water layer, the other end of casing is pressed to be connected to well head.
In one embodiment of this invention, aforementioned rubber plug one end is placed with bruising head.
In one embodiment of this invention, aforementioned casing closing well sliding sleeve further includes：Sliding sleeve inner casing, sliding sleeve shell, pin, cunning
Cover ontology；
The thickness of sliding sleeve ontology is more than the thickness of any casing；
Sliding sleeve shell is positioned in sliding sleeve ontology, and sliding sleeve shell is connect with sliding sleeve ontology, and cycle is placed in sliding sleeve shell
Channel is placed with circulation port on sliding sleeve side wall of outer shell, and circulation port is connect with circulation canal, and sliding sleeve shell is placed with sealing ring, uses
It is tightly connected in by sliding sleeve shell and sliding sleeve inner casing；
Pin is positioned between sliding sleeve shell and sliding sleeve inner casing, for connecting sliding sleeve inner casing and sliding sleeve shell, is made in sliding sleeve
Shell is higher than circulation port.
In one embodiment of this invention, aforementioned circulation port is 2.
In one embodiment of this invention, the diameter of aforementioned more casings is identical.
In one embodiment of this invention, the thickness of aforementioned sliding sleeve ontology is at least 2 times of casing thickness.
In one embodiment of this invention, aforementioned sliding sleeve ontology is placed with spiral shell close to one end of well cementation pipe string combination bottom end
Line is used between sliding sleeve ontology and sliding sleeve shell and is threadedly coupled.
In one embodiment of this invention, centralizer is placed on casing between aforementioned float collar and float shoe, is used for righting float shoe
With float collar, make float shoe and float collar that well cementation pipe string combination be guided to be located among pit shaft.
In one embodiment of this invention, aforementioned centralizer is spring centralizer.
Another aspect of the present invention provides a kind of cementing method, is carried out using the well cementation pipe string combination of such as aforementioned any embodiment
Well cementation, cementing method include：
The pipe string combination that will cement the well is down toward shaft bottom；
The cement injection into well cementation pipe string combination；
Rubber plug is put into from well head in well cementation pipe string combination, starts to replace construction；
Rubber plug replaces at operation to casing closing well sliding sleeve, closes casing closing well sliding sleeve；
Casing closing well sliding sleeve lower end sleeve closure builds the pressure, and from well cementation pipe string combination liquid feeding pressure, hydraulic expanding packer is held
Pressure, well cementation pipe string combination generate pressure difference up and down, set hydraulic expanding packer, hydraulic expanding packer inflation is expanded to well
Wall, the hydraulic expanding packer expansion that high pressure water layer lower end is positioned in every group of hydraulic expanding packer touch high pressure water layer
The borehole wall of lower end, the hydraulic expanding packer expansion for being positioned over high pressure water layer upper end touch the borehole wall of high pressure water layer upper end, make
It is sealed between high pressure water layer upper end and high pressure water layer lower end, insulates high pressure water layer, Hou Ning.
In an embodiment of the present invention, aforementioned closing casing closing well sliding sleeve specifically includes：
Rubber plug replaces at operation to casing closing well sliding sleeve, and connection sliding sleeve is cut in bruising head and the sliding sleeve inner casing bruising of rubber plug
The pin of inner casing and sliding sleeve shell, sliding sleeve inner casing come downwards to circulation canal, and the circulation port on closed circulation channel is closed casing and closed
Well sliding sleeve.
In an embodiment of the present invention, aforementioned to further include before cement injection into well cementation pipe string combination：To well cementation tubing string
Insulating liquid is noted in combination.
In an embodiment of the present invention, aforementioned well cementation pipe string combination is specifically included down toward shaft bottom：Well cementation pipe string combination is occupied
Middle pit shaft.
Well cementation pipe string combination provided by the invention and cementing method, by float shoe and float collar guiding well cementation pipe string combination down toward
Shaft bottom designated position, when replacing construction, rubber plug, which replaces, closes casing closing well sliding sleeve, casing closing well at operation to casing closing well sliding sleeve
Sliding sleeve lower end sleeve closure builds the pressure, hydraulic expanding packer pressure-bearing, sets hydraulic expanding packer, insulates high pressure water layer,
Improve cementing quality.
Description of the drawings
Fig. 1 is the well cementation pipe string combination structural schematic diagram that one embodiment of the invention provides；
Fig. 2 is the well cementation pipe string combination structural representation for the hydraulic expanding packer setting that one embodiment of the invention provides
Figure；
Fig. 3 is the well cementation pipe string combination structural schematic diagram that another embodiment of the present invention provides；
Fig. 4 A, Fig. 4 B are casing closing well sliding sleeve closing well process schematic provided by the invention；
Fig. 5 is the structural schematic diagram of casing closing well sliding sleeve provided by the invention；
Fig. 6 is the structural schematic diagram of casing closing well sliding sleeve closing well provided by the invention；
Fig. 7 is the well cementation pipe string combination structural representation for the hydraulic expanding packer setting that another embodiment of the present invention provides
Figure；
Fig. 8 is the cementing method flow chart that one embodiment of the invention provides.
Reference sign：
1- float shoes；2- centralizers；3- float collars；
4- casing closing well sliding sleeves；5- casings；6- hydraulic expanding packers；
7- rubber plugs；8- sliding sleeve inner casings；9- sliding sleeve shells；
10- pins；11- circulation ports；12- sliding sleeve ontologies；
71- bruising heads.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 is the well cementation pipe string combination structural schematic diagram that one embodiment of the invention provides, and Fig. 2 carries for one embodiment of the invention
The well cementation pipe string combination structural schematic diagram of the hydraulic expanding packer setting of confession.As depicted in figs. 1 and 2, the present invention provides one
Kind well cementation pipe string combination, including：Float shoe 1, float collar 3, casing closing well sliding sleeve 4, hydraulic expanding packer 6 and Duo Gen casings 5.
Float shoe 1 is placed on the lowermost end of well cementation pipe string combination；Float collar 3 is placed on the upper end of float shoe 1, float collar 3 and float shoe 1 it
Between by casing connection.
The placement specifically, float collar 3 and float shoe 1 match can guide well cementation pipe string combination along pit shaft smoothly down toward shaft bottom.
Casing connection is used between float collar 3 and float shoe 1, stays the block that a distance is conducive to liquid logical between float shoe 1 and float collar 3
It crosses.The diameter of more casings 5 is identical, and the present embodiment is not limited the number and length of casing, and specific number and length can
Depending on the actual conditions of drilling well.It should be noted that the concrete structure and base of float shoe 1 provided in this embodiment and float collar 3
Present principles are identical with the structure and basic principle of prior art float shoe and float collar, and details are not described herein.
Optionally, centralizer 2 is placed between float collar 3 and float shoe 1 on casing, centralizer 2 is used for righting float shoe 1 and float collar
3, make float shoe 1 and float collar 3 that well cementation pipe string combination be guided to be located among pit shaft.Specifically, centralizer 2 is spring centralizer.
Casing closing well sliding sleeve 4 is placed on the upper end of float collar 3, by casing connection between casing closing well sliding sleeve 4 and float collar 3.
Casing closing well sliding sleeve 4 includes rubber plug 7, and the diameter of rubber plug 7 is less than casing closing well sliding sleeve 4 and hydraulic expanding packer
6 internal diameter closes casing closing well sliding sleeve 4 for replacing at liquid and operation to casing closing well sliding sleeve 4 in well cementation pipe string combination.
Specifically, after cement mortar is injected in well cementation pipe string combination, rubber plug 7 is put into from well head in well cementation pipe string combination,
The cement mortar cemented the well in pipe string combination is expressed to outside well cementation pipe string combination by rubber plug 7, and cement mortar flows to well cementation pipe string combination and well
In the space of wall, rubber plug 7 replaces and closes casing closing well at cement mortar and operation to casing closing well sliding sleeve 4 in well cementation pipe string combination
Sliding sleeve 4.The diameter of rubber plug 7 is less than the internal diameter of casing closing well sliding sleeve 4 and hydraulic expanding packer 6, it is ensured that rubber plug 7 can be run
To casing closing well sliding sleeve 4.It should be noted that the liquid in the present embodiment in pipe string combination is not limited in cement mortar,
It can be insulating liquid.
Hydraulic expanding packer 6 is positioned over the upper end of casing closing well sliding sleeve 4, by casing between casing closing well sliding sleeve 4
Connection, it includes two hydraulic expanding packers 6 that hydraulic expanding packer 6, which is at least in one group, every group, one of to place
In the lower end of high pressure water layer, another is positioned over the upper end of high pressure water layer, by casing connection between hydraulic expanding packer 6.
Specifically, it includes two hydraulic expanding packers 6 that hydraulic expanding packer 6, which is at least in one group, every group,
In a lower end for being positioned over high pressure water layer, another is positioned over the upper end of high pressure water layer, it is ensured that hydraulic expanding packer 6
When setting, 6 dilator of hydraulic expanding packer of high pressure water layer lower end is positioned over to the borehole wall of high pressure water layer lower end, is positioned over
6 dilator of hydraulic expanding packer of high pressure water layer upper end makes high pressure water layer upper end and height to the borehole wall of high pressure water layer upper end
Pressure water layer seals between lower end, and then reaches packing high pressure water layer.Casing between adjusting hydraulic expanding packer 6 can be passed through
The number and length of casing ensure in every group that two hydraulic pressure expand between hydraulic expanding packer 6 and casing closing well sliding sleeve 4
One of them is positioned over the lower end of high pressure water layer for formula packer 6, another is positioned over the upper end of high pressure water layer.It needs to illustrate
It is that the concrete structure of hydraulic expanding packer 6 and realization principle are insulated with hydraulic expanding in the prior art in the present embodiment
Device is identical, and details are not described herein.
Be positioned on the hydraulic expanding packer 6 of the upper end of high pressure water layer and place casing, one end of casing be positioned over
The hydraulic expanding packer 6 of the upper end of high pressure water layer connects, and the other end of casing is connected to well head.
It should be noted that it is provided in this embodiment well cementation pipe string combination in float shoe 1, float collar 3, casing closing well sliding sleeve 4,
Several casings 5, hydraulic expanding packer 6 are all independent, when specifically used, need to only be wanted according to well cementation pipe string combination
Ask connection float shoe 1, float collar 3, casing closing well sliding sleeve 4, several casings 5, hydraulic expanding packer 6.
In the specific use process, float shoe 1 and float collar 3 guide well cementation tubing string group to well cementation pipe string combination provided in this embodiment
It closes down toward shaft bottom designated position；The cement injection into well cementation pipe string combination puts into rubber plug 7 in well cementation pipe string combination from well head,
Start to replace construction, cement mortar is made to be cemented out from bottom to up from well cementation pipe string combination；Rubber plug 7 replaces operation to casing closing well
At sliding sleeve 4, casing closing well sliding sleeve 4 is closed；4 lower end sleeve closure of casing closing well sliding sleeve builds the pressure, and hydraulic expanding packer 6 is held
Pressure, sets hydraulic expanding packer 6, is positioned over 6 dilator of hydraulic expanding packer of high pressure water layer lower end to high pressure water
The borehole wall of layer lower end, is positioned over 6 dilator of hydraulic expanding packer of high pressure water layer upper end to the borehole wall of high pressure water layer upper end,
Make to seal between high pressure water layer upper end and high pressure water layer lower end, insulates high pressure water layer.
Well cementation pipe string combination provided in this embodiment is referred to by float shoe 1 and the guiding well cementation pipe string combination of float collar 3 down toward shaft bottom
Positioning is set, and when replacing construction, rubber plug 7 replaces and closes casing closing well sliding sleeve 4 at operation to casing closing well sliding sleeve 4, and casing closing well is slided
It covers 4 lower end sleeve closures to build the pressure, 6 pressure-bearing of hydraulic expanding packer, sets hydraulic expanding packer 6, insulate high pressure water layer,
Improve cementing quality.
Fig. 3 is the well cementation pipe string combination structural schematic diagram that another embodiment of the present invention provides, and Fig. 4 A, Fig. 4 B carry for the present invention
The casing closing well sliding sleeve closing well process schematic of confession, Fig. 5 are the structural schematic diagram of casing closing well sliding sleeve provided by the invention, Fig. 6
For the structural schematic diagram of casing closing well sliding sleeve closing well provided by the invention, Fig. 7 is that the hydraulic pressure that another embodiment of the present invention provides expands
Open the well cementation pipe string combination structural schematic diagram of formula packer setting.It is provided by the invention as shown in Fig. 3, Fig. 4 A, Fig. 4 B, Fig. 5-7
Well cementation pipe string combination casing closing well sliding sleeve 4 further includes：Sliding sleeve inner casing 8, sliding sleeve shell 9, pin 10, sliding sleeve ontology 12.
The thickness of sliding sleeve ontology 12 is more than the thickness of any casing；Sliding sleeve shell 9 is positioned in sliding sleeve ontology 12, sliding sleeve
Shell 9 is connect with sliding sleeve ontology 12, and circulation canal is placed in sliding sleeve shell 9, circulation port is placed on 9 side wall of sliding sleeve shell
11, circulation port 11 is connect with circulation canal, and sliding sleeve shell 9 is placed with sealing ring, for sliding sleeve shell 9 and sliding sleeve inner casing 8 is close
Envelope connection；Pin 10 is positioned between sliding sleeve shell 9 and sliding sleeve inner casing 8, for connecting sliding sleeve inner casing 8 and sliding sleeve shell 9, makes cunning
It covers inner casing 8 and is higher than circulation port 11.
Optionally, 7 one end of rubber plug is placed with bruising head 71；Circulation port 11 is 2, and the thickness of sliding sleeve ontology 12, which is at least, to be covered
2 times of tube thickness；Sliding sleeve ontology 12 is placed with screw thread close to one end of well cementation pipe string combination bottom end, sliding sleeve ontology 12 with outside sliding sleeve
Using threaded connection between shell 9.
Specifically, the thickness of sliding sleeve ontology 12 is more than the thickness of any casing, it is ensured that sliding sleeve ontology 12 has enough
Bearing capacity.7 one end of rubber plug is placed with bruising head 71 so that when rubber plug 7 is run at casing closing well sliding sleeve 4,7 front end of rubber plug
The pin 10 of connection sliding sleeve inner casing 8 and sliding sleeve shell 9, sliding sleeve inner casing are cut in bruising head 71 and the 8 mating realization bruising of sliding sleeve inner casing
8 come downwards to circulation canal, block the circulation port 11 on circulation canal, close casing closing well sliding sleeve 4.
In the specific use process, float shoe 1 and float collar 3 guide well cementation tubing string group to well cementation pipe string combination provided in this embodiment
It closes down toward shaft bottom designated position；The cement injection into well cementation pipe string combination puts into rubber plug 7 in well cementation pipe string combination from well head,
Start to replace construction, cement mortar is made to be cemented out from bottom to up from well cementation pipe string combination；Rubber plug 7 replaces operation to casing closing well
At sliding sleeve 4, bruising head 71 and the 8 mating realization bruising of sliding sleeve inner casing of 7 front end of rubber plug are cut outside connection sliding sleeve inner casing 8 and sliding sleeve
The pin 10 of shell 9, sliding sleeve inner casing 8 come downwards to circulation canal, block the circulation port 11 on circulation canal, close casing closing well sliding sleeve
4；4 lower end sleeve closure of casing closing well sliding sleeve builds the pressure, and 6 pressure-bearing of hydraulic expanding packer sets hydraulic expanding packer 6,
6 dilator of hydraulic expanding packer of high pressure water layer lower end is positioned over to the borehole wall of high pressure water layer lower end, is positioned over high pressure water
6 dilator of hydraulic expanding packer of layer upper end makes high pressure water layer upper end and high pressure water layer to the borehole wall of high pressure water layer upper end
It is sealed between lower end, insulates high pressure water layer.
Well cementation pipe string combination provided in this embodiment, on the basis of the above embodiments, by placing casing closing well sliding sleeve
It is placed with bruising head 71 including sliding sleeve inner casing 8, sliding sleeve shell 9, pin 10, sliding sleeve ontology 12 and 7 one end of rubber plug so that top
When for operation, rubber plug 7 replaces at operation to casing closing well sliding sleeve 4, bruising head 71 and the 8 mating reality of sliding sleeve inner casing of 7 front end of rubber plug
The pin 10 of connection sliding sleeve inner casing 8 and sliding sleeve shell 9 is cut in existing bruising, and sliding sleeve inner casing 8 comes downwards to circulation canal, blocks cycle
Circulation port 11 on channel closes casing closing well sliding sleeve 4, and 4 lower end sleeve closure of casing closing well sliding sleeve builds the pressure, hydraulic expanding envelope
Every 6 pressure-bearing of device, hydraulic expanding packer 6 is set, can effectively insulate high pressure water layer, improves cementing quality.
Fig. 8 is the cementing method flow chart that one embodiment of the invention provides, as shown in figure 8, well cementation side provided by the invention
Method is cemented the well using the well cementation pipe string combination of such as above-mentioned any embodiment, including：
S801：The pipe string combination that will cement the well is down toward shaft bottom；
Specifically, 3 mating placement of float shoe 1 and float collar in well cementation pipe string combination, guiding well cementation pipe string combination is smooth along pit shaft
Down toward shaft bottom designated position.
Optionally, well cementation pipe string combination is specifically included down toward shaft bottom：The pipe string combination that will cement the well pit shaft placed in the middle.
Specifically, the centralizer 2 placed on casing between float shoe 3 and float collar 1 makes float shoe for righting float shoe 1 and float collar 3
1 and float collar 3 guiding well cementation pipe string combination be located among pit shaft.
S802：The cement injection into well cementation pipe string combination；
Specifically, the cement injection into well cementation pipe string combination of the cement pump truck on well head.It should be noted that the present embodiment
In cement pump truck into well cementation pipe string combination the detailed process of cement injection and identical in the prior art, details are not described herein.
Optionally, further include before cement injection into well cementation pipe string combination：Insulating liquid is noted into well cementation pipe string combination.Really
The cleaning that well cementing pipe group combines before cement injection into well cementation pipe string combination is protected, it being capable of more effective cement injection and replacement water
Mud.
S803：Rubber plug 7 is put into from well head in well cementation pipe string combination, starts to replace construction, makes cement mortar from well cementing pipe
Column combination cements out from bottom to up；
S804：Rubber plug 7 replaces at operation to casing closing well sliding sleeve 4, closes casing closing well sliding sleeve 4；
It is specifically included specifically, closing casing closing well sliding sleeve 4：Rubber plug 7 replaces at operation to casing closing well sliding sleeve 4, rubber plug 7
The pin 10 of connection sliding sleeve inner casing 8 and sliding sleeve shell 9, sliding sleeve inner casing 8 are cut in the bruising head 71 of front end and 8 bruising of sliding sleeve inner casing
Circulation canal is come downwards to, the circulation port 11 on circulation canal is blocked, closes casing closing well sliding sleeve 4.
S805：4 lower end sleeve closure of casing closing well sliding sleeve builds the pressure, from well cementation pipe string combination liquid feeding pressure, hydraulic expanding envelope
Every 6 pressure-bearing of device, well cementation pipe string combination generates pressure difference up and down, sets hydraulic expanding packer 6, hydraulic expanding packer 6 is swollen
Swollen to be expanded to the borehole wall, the hydraulic expanding packer 6 that high pressure water layer lower end is positioned in 6 every groups of hydraulic expanding packer is expanded
The borehole wall for touching high pressure water layer lower end, the expansion of hydraulic expanding packer 6 for being positioned over high pressure water layer upper end touch high pressure water layer
The borehole wall of upper end makes to seal between high pressure water layer upper end and high pressure water layer lower end, insulates high pressure water layer, Hou Ning.
Cementing method provided in this embodiment is cemented the well using the well cementation pipe string combination of such as above-mentioned any embodiment, is led to
Float shoe 1 and the guiding of float collar 3 well cementation pipe string combination are crossed down toward shaft bottom designated position, when replacing construction, rubber plug 7 replaces operation to casing
Casing closing well sliding sleeve 4 is closed at closing well sliding sleeve 4,4 lower end sleeve closure of casing closing well sliding sleeve builds the pressure, hydraulic expanding packer 6
Pressure-bearing sets hydraulic expanding packer 6, insulates high pressure water layer, improves cementing quality.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (13)
1. a kind of well cementation pipe string combination, which is characterized in that including：Float shoe, float collar, casing closing well sliding sleeve, hydraulic expanding packing
Device and Duo Gen casings；
The float shoe is placed on the lowermost end of the well cementation pipe string combination；
The float collar is placed on the upper end of the float shoe, by casing connection between the float collar and the float shoe；
Described sleeve pipe closing well sliding sleeve is placed on the upper end of the float collar, by casing between described sleeve pipe closing well sliding sleeve and the float collar
Connection；
Described sleeve pipe closing well sliding sleeve includes rubber plug, and the diameter of the rubber plug is less than described sleeve pipe closing well sliding sleeve and the hydraulic dilatation
The internal diameter of formula packer is closed for replacing at liquid and operation to described sleeve pipe closing well sliding sleeve in the well cementation pipe string combination
Described sleeve pipe closing well sliding sleeve；
The hydraulic expanding packer is positioned over the upper end of described sleeve pipe closing well sliding sleeve, between described sleeve pipe closing well sliding sleeve by
Casing connection, it includes two hydraulic expanding packers that the hydraulic expanding packer, which is at least in one group, every group,
In a lower end for being positioned over high pressure water layer, another is positioned over the upper end of high pressure water layer, the hydraulic expanding packer it
Between by casing connection；
Place casing on the hydraulic expanding packer of the upper end for being positioned over high pressure water layer, one end of described sleeve pipe with it is described
It is positioned over the hydraulic expanding packer connection of the upper end of high pressure water layer, the other end of described sleeve pipe is connected to well head.
2. well cementation pipe string combination according to claim 1, which is characterized in that described rubber plug one end is placed with bruising head.
3. well cementation pipe string combination according to claim 2, which is characterized in that described sleeve pipe closing well sliding sleeve further includes：Sliding sleeve
Inner casing, sliding sleeve shell, pin, sliding sleeve ontology；
The thickness of the sliding sleeve ontology is more than the thickness of any described sleeve pipe；
The sliding sleeve shell is positioned in the sliding sleeve ontology, and the sliding sleeve shell is connect with the sliding sleeve ontology, the sliding sleeve
It is placed with circulation canal in shell, circulation port, the circulation port and the circulation canal are placed on the sliding sleeve side wall of outer shell
Connection, the sliding sleeve shell are placed with sealing ring, for the sliding sleeve shell and the sliding sleeve inner casing to be tightly connected；
The pin is positioned between the sliding sleeve shell and the sliding sleeve inner casing, for connecting the sliding sleeve inner casing and the cunning
Shell is covered, the sliding sleeve inner casing is made to be higher than the circulation port.
4. well cementation pipe string combination according to claim 3, which is characterized in that the circulation port is 2.
5. well cementation pipe string combination according to claim 4, which is characterized in that the diameter of the more casings is identical.
6. well cementation pipe string combination according to claim 5, which is characterized in that the thickness of the sliding sleeve ontology is at least casing
2 times of thickness.
7. well cementation pipe string combination according to claim 6, which is characterized in that the sliding sleeve ontology is close to the well cementation tubing string
One end of combination bottom end is placed with screw thread, uses and is threadedly coupled between the sliding sleeve ontology and the sliding sleeve shell.
8. well cementation pipe string combination according to claim 1, which is characterized in that between the float collar and the float shoe on casing
Centralizer is placed, for float shoe described in righting and the float collar, the float shoe and the float collar is made to guide the well cementation tubing string group
It closes and is located among pit shaft.
9. well cementation pipe string combination according to claim 8, which is characterized in that the centralizer is spring centralizer.
10. a kind of cementing method, which is characterized in that carried out using such as claim 1-9 any one of them well cementation pipe string combination
Well cementation, the cementing method include：
By the well cementation pipe string combination down toward shaft bottom；
The cement injection into the well cementation pipe string combination；
Rubber plug is put into from well head in the well cementation pipe string combination, starts to replace construction；
The rubber plug replaces at operation to casing closing well sliding sleeve, closes described sleeve pipe closing well sliding sleeve；
Described sleeve pipe closing well sliding sleeve lower end sleeve closure builds the pressure, from the well cementation pipe string combination liquid feeding pressure, hydraulic expanding packing
Device pressure-bearing, the well cementation pipe string combination generate pressure difference up and down, set the hydraulic expanding packer, the hydraulic expanding envelope
It is sealed every the hydraulic expanding for being positioned over high pressure water layer lower end in device expanse to the borehole wall, every group of the hydraulic expanding packer
The borehole wall of high pressure water layer lower end is stated every device dilator residence, is positioned over the hydraulic expanding packer dilator of high pressure water layer upper end
The borehole wall of high pressure water layer upper end is stated in residence, makes to seal between high pressure water layer upper end and high pressure water layer lower end, and packing is high
Press water layer, Hou Ning.
11. cementing method according to claim 10, which is characterized in that the closing described sleeve pipe closing well sliding sleeve specifically wraps
It includes：
The rubber plug replaces at operation to casing closing well sliding sleeve, and connection is cut in bruising head and the sliding sleeve inner casing bruising of the rubber plug
The pin of the sliding sleeve inner casing and sliding sleeve shell, the sliding sleeve inner casing come downwards to circulation canal, close on the circulation canal
Circulation port closes described sleeve pipe closing well sliding sleeve.
12. cementing method according to claim 10, which is characterized in that into the well cementation pipe string combination cement injection it
Before further include：
Insulating liquid is noted into the well cementation pipe string combination.
13. cementing method according to claim 10, which is characterized in that the well cementation pipe string combination is specific down toward shaft bottom
Including：
By well cementation pipe string combination pit shaft placed in the middle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002304.6A CN105822252B (en) | 2015-01-04 | 2015-01-04 | Pipe string combination of cementing the well and cementing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002304.6A CN105822252B (en) | 2015-01-04 | 2015-01-04 | Pipe string combination of cementing the well and cementing method |
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| CN109403911B (en) * | 2017-08-15 | 2021-09-24 | 中国石油化工股份有限公司 | Well cementing pipe column and well cementing method |
| CN108119091B (en) * | 2017-09-08 | 2020-08-11 | 中国石油天然气股份有限公司 | Well cementation and completion pipe string and method |
| CN109882114B (en) * | 2019-03-13 | 2024-02-06 | 东营市友佳石油科技有限公司 | Zero-pollution well cementing tool for oil well production layer and process method |
| CN112443290A (en) * | 2019-08-28 | 2021-03-05 | 中国石油化工股份有限公司 | Anchoring packing cement surface control device and well cementation tubular column comprising same |
| US11767734B2 (en) | 2021-08-12 | 2023-09-26 | Saudi Arabian Oil Company | Off bottom cementing system |
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