CN106437641B - The long-acting two-tube water injection string of independent safety - Google Patents
The long-acting two-tube water injection string of independent safety Download PDFInfo
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- CN106437641B CN106437641B CN201510489189.XA CN201510489189A CN106437641B CN 106437641 B CN106437641 B CN 106437641B CN 201510489189 A CN201510489189 A CN 201510489189A CN 106437641 B CN106437641 B CN 106437641B
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Abstract
The invention discloses the long-acting two-tube water injection strings of independent safety, including the inner tube being independently arranged and the outer tube being independently arranged, said inner tube coaxial-type is arranged in outer tube, said inner tube center cavity is as the interior waterflood path for being connected to lower oil reservoir, annular space is formed by between said inner tube and outer tube as the outer waterflood path for being connected to upper oil reservoir, in described, annular space position between outer tube upper end and outer tube upper end outer wall and casing is respectively provided with safety control, respectively inner tube safety valve, annulus safety valve and annular space safe containment device, inner tube is controlled respectively, inner and outer pipes annular space and outer tube and three axial passages of casing annulus, it is totally-enclosed when the realization pit shaft state of emergency；Said inner tube lower end connects interior water injection string, and the outer tube lower end connects outer water injection string.Present invention mainly solves security controls existing in the prior art, and unreliable, inner and outer pipes shunt the problem of not in place, outer tube is easy failure, tubing string force unbalance.
Description
Technical field
The present invention relates to oil exploitation downhole water injection strings；The specifically long-acting two-tube water injection string of independent safety.
Background technique
The water injection technology that marine water injection well uses at present is mainly open-core type separate zone waterflooding technology and concentric double pipe water filling skill
Art.The former is adjusted using survey online to water injection well progress of tune integrated technique is surveyed with one heart.But due to being limited by hole deviation, bottom pressure
Greatly, the constraint of temperature high condition, leverages and is measured and tuned into power, constrains the urgent need of marine fining water filling.Mesh
Although preceding concentric double pipe water filling can be deployed with ground, there is survey to adjust, and simple, injection allocation is accurate, saves the spy of a large amount of workload
Point realizes effective seperated layer water injection of big pressure difference oil reservoir.But the technique is equally limited by hole deviation in the application, bottom pressure is big,
The constraint of temperature high condition.It is mainly shown as: under outer tube in place after, tripping in bottom end have sealing plug inner tube, work as well
When environment is dirtier in oblique larger or well, the inner sealing surface of inner tube sealing plug and internal sealed current divider is not able to cooperate sealing.
Particularly with Dongying Formation deep-well, when water filling operating condition changes, string creep, high temperature and pressure cause inner sealing surface to damage, and lead
It causes inner and outer pipes that cannot effectively shunt, affects the effect of offshore oilfield fining water filling.In addition, the use of annulus safety valve will be interior
Pipe weight almost all is added in outer tube top, increases the probability of outer tube failure, directly affects the service life of water injection string.
By retrieval, publication number 102953716A, the patent application of publication date 2013-03-06 discloses a kind of parallel double
Pipe separate layer water injection string, the tubing string fill the water pipe nipple, insertion by oil pipe, oil pipe, dual tubing packing, single tube packer, hydraulic slip
Sealing, seating and sealing unit, screen casing, silk plug composition, wherein oil pipe, single tube packer, hydraulic slip, sets dress at dual tubing packing
It sets, screen casing, silk plug are fixedly connected sequentially；Oil pipe and oil pipe are installed in parallel on dual tubing packing, the installation of dual tubing packing lower part
The water filling pipe nipple.The tubing string is injected separately into pair by the oil jacket annulus between screen casing, water filling pipe nipple and casing and oil pipe, oil pipe
The water filling layer answered, realizes the purpose of seperated layer water injection, and well head water distribution valve can be with accurate measurement and allotment water injection rate.In the art
The interior prior art without finding with the application same structure.We have found that this open source literature is parallel in order to solve the problems, such as to use
Two-tube, first conceives not identical with present invention, and the second technical effect for being embodied is not identical.
By retrieval, it was found that open (bulletin) number 101775977A, the open text of open (bulletin) day 2010-07-14
It offers and discloses a kind of dual-tube injection well safety production string, including ground control system, liquid controling pipe line, annulus safety valve, annular space
Packer, positioning injection valve, sealing plug, tubing string, injection safety valve, injection layer separating packer, injection valve, silk plug, bottom filter
Sandpipe, anchor, sand control packer, sand control screen, sand control pipe, casing string and water injection string.The water injection string top peace
Loaded in casing string, lower part is installed in sand control pipe.Sand control pipe is installed in casing string.Sand control pipe top is equipped with outstanding
Hang packer, middle part, which is sequentially installed, is connected with sand control screen, sand control packer, sand control screen, lower part sequentially with anchoring device, bottom
Portion's sand screen, silk plug are connected.Annulus safety valve, annular packer, positioning injection valve, injection are sequentially installed on water injection string
Safety valve, injection layer separating packer, injection valve and silk plug, by liquid controling pipe line between annulus safety valve and ground hydraulic control system
It is connected.This open source literature is similar with the application, but has the following defects after comparing the application, in open source literature
It dispenses two-tube and lower section water injection string to be an integral structure, not only load itself is very big in this way, and especially water injection pressure is sent out
When changing, anchoring device or the packer institute installed are loaded very big, and use is unstable, and integral structure is also easy damage
Each component life of bad influence；The sealing plug of lower end is not easy to be inserted into position in use, and after shunting radially, axially,
It is unstable that slanting glide path causes shunting；Annular packer as entire integral structure safe containment device pressure too
Greatly, security reliability is very low；The setting of packer does not have balance, because open source literature only discloses two packer difference
Positioned at the top of upper oil reservoir and the top of lower oil reservoir, two such oil reservoir produces imbalance, and string creep is very big, affects
Tubing string bulk life time.
Summary of the invention
The purpose of the present invention is to provide the long-acting two-tube water injection strings of independent safety, are pacified using annulus safety valve, inner tube
Full valve and annular space safe containment device ensure the downhole safety in each channel respectively, using interior compression packer packing every inside and outside pipe ring
Shape space, uses internal and external equilibrium packer as the soft anchoring of tubing string, which mainly solves peace existing in the prior art
Unreliable, inner and outer pipes are controlled entirely shunts the problem of not in place, string creep and outer tube stress are easy greatly very much failure.
In order to achieve the above objectives, present invention employs following technical solution, the long-acting two-tube water injection string of independent safety,
Including the inner tube being independently arranged and the outer tube being independently arranged, said inner tube coaxial-type is arranged in outer tube, said inner tube
The chambers of the heart is formed by annular space as being connected to and oils as the interior waterflood path for being connected to lower oil reservoir between said inner tube and outer tube
The outer waterflood path of layer, the annular space position between the inner and outer pipe upper end and outer tube upper end outer wall and casing is respectively provided with safety
Control device, respectively inner tube safety valve, annulus safety valve and annular space safe containment device control inner tube, inside and outside pipe ring respectively
Empty and outer tube and three axial passages of casing annulus, it is totally-enclosed when realizing the pit shaft state of emergency；The connection of said inner tube lower end
Interior water injection string, the outer tube lower end connect outer water injection string.
The outer water injection string, including sequentially connected two outer screen pipes up and down, the outer tube bottom end is sequentially connected two
Outer screen pipe, wherein the corresponding upper oil reservoir of the outer screen pipe of top, the corresponding lower oil reservoir of the outer screen pipe of lower section, and the outer screen pipe upper end of top
Outer wall installs layer separating packer, and the outer screen pipe upper end outer wall of lower section installs lower leaf packer, and higher slice packer is located at upper
Oil reservoir top position, lower leaf packer are located at lower oil reservoir top position, and the outer screen pipe lower end outer wall of lower section is equipped with outer balance
Packer, outer balance packer are located at lower oil reservoir lower position, and the water injection string bottom end opening blocks big silk plug.
The interior water injection string, including interior screen casing, small silk plug, said inner tube bottom end connects interior screen casing, under interior screen casing is corresponding
The bottom end opening of the outer screen pipe and lower oil reservoir of side, water injection string blocks small silk plug, the interior water injection string and outer water injection string
Between install in compression packer, position of the interior compression packer between upper and lower two outer screen pipes, the interior screen casing lower end
Inner equilibrium packer is installed, inner equilibrium packer is located at lower oil reservoir lower position between outer wall and the outer screen pipe outer wall of lower section.
The annular space safe containment device, higher slice packer, lower leaf packer, interior compression packer, outer balance envelope
Pass through a liquid controling pipe line every device, inner equilibrium packer and is connected to ground control system, the annular space safe containment device band
There is locking device, suppressed by ground and once set, pressure release does not unseal, and higher slice packer, lower leaf packer, interior compression
Packer, outer balance packer, inner equilibrium packer are to suppress to set, and realize seperated layer water injection, and pressure release packing element unseals completely, real
The huge discharge anti-flushing well of existing pit shaft.
The annulus safety valve upper end is connected to ground control system by liquid controling pipe line, inside be equipped with seal operation cylinder and
Spare waterflood path；The inner tube safety valve upper end equally passes through liquid controling pipe line and is connected to ground control system, internal same
Equipped with spare waterflood path；Said inner tube tubing string upper end is additionally provided with sealing plug, with the sealing inside the annulus safety valve
Seating nipple is used cooperatively.
Compared to the prior art, the invention has the following advantages:
(1) security control part uses inner tube safety valve, annulus safety valve and annular space safe containment device, passes through hydraulic control pipe
Line individually controls three axial passages in pit shaft, when an unexpected situation occurs, pipeline releasing pressure automatically, inner tube safety valve and ring
Empty safety valve is automatically closed under the driving of internal mechanism, and annular space safe containment device is located always under the action of retaining mechanism
In setting state, keep downhole safety relatively reliable；
(2) inner and outer tubes, which are completely independent, separates, and reduces the load that inner tube is attached on outer tube, improves outer tube and use the longevity
Life；
(3) when site operation, it is only necessary to for two sets of processes with regard to both of which tripping in, working procedure is simple, saves construction cost,
Annulus safety valve and inner tube safety valve all have spare waterflood path simultaneously, when liquid controling pipe line failure, still can be realized
Safety injection, while reducing operating cost；Packing element, washer, cushion rubber all use heat resistant and wear resistant material, adapt to high temperature
The use of high-pressure well, high angle hole, deep-well；
(4) interior compression packer is suppressed by ground is inwardly compressed packing element, realizes that stablizing for concentric double pipe water filling shunts, solution
Determined former sealing plug because in well too big etc. various reasons of too dirty, hole deviation insert it is not in place caused by shunt insecure problem；
(5) all packers all use hydraulic control mode, can be controlled with ground, easy to operate, and it is anti-that huge discharge also may be implemented
Well-flushing；
(6) it fills the water inside and outside tubing portion and is all made of balance design, string creep can be substantially reduced, improve a whole set of pipe
The service life of column.
In short, the invention can be avoided safety and environmental protection accident when fortuitous event occurs, meets maritime safety production needs, apply
Work process is relatively easy, while a whole set of design of string pipe greatly prolongs the service life of water injection string, reduces operating cost, especially full
The needs of the two-tube water filling of the exceptional wells such as sufficient oil field high angle hole, hp-ht well.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the long-acting two-tube water injection string of independent safety of the invention.
In figure: ground control system 1, casing 2, liquid controling pipe line 3, liquid controling pipe line 4, liquid controling pipe line 5, annulus safety valve 6, close
Seal plug 7, inner tube safety valve 8, waterflood path 9, annular space safe containment device 10, outer tube 11, inner tube 12, higher slice packer 13,
Outer screen pipe 14, interior compression packer 15, lower leaf packer 16, interior screen casing 17, outer balance packer 18, inner equilibrium packer
19, small silk plug 20, big silk plug 21.
Specific embodiment
Detailed description for the present invention and technology contents, cooperation Detailed description of the invention it is as follows, however attached drawing only provides reference with
Purposes of discussion is not intended to limit the present invention.
According to Fig. 1, independent safety long-acting two-tube water injection string including the inner tube 12 being independently arranged and is independently arranged
Outer tube 11, for the setting of said inner tube coaxial-type in outer tube, said inner tube center cavity is logical as the interior water filling for being connected to lower oil reservoir
Road is formed by annular space as the outer waterflood path for being connected to upper oil reservoir, the inner and outer pipes upper end between said inner tube and outer tube
It is respectively provided with safety control, including inner tube safety valve 8, annulus safety valve 6 and annular space safe containment device 10, respectively in control
Pipe, three axial passages of inner and outer pipes annular space and outer tube and casing annulus, realize the pit shaft state of emergency when it is totally-enclosed, it is described outside
Pipe lower end is water filling device, including higher slice packer 13, outer screen pipe 14, interior compression packer 15, lower leaf packer 16, outer
Screen casing 14, outer balance packer 18, inner equilibrium packer 19, big silk plug 21, said inner tube lower end water filling device is relatively easy, packet
Include interior screen casing 14 and small silk plug 20.
When site operation, according to shown in Fig. 1, the big silk plug 21 on outer tube outer wall, inner equilibrium packer 19, outer balance are sealed
Every device 18, outer screen pipe 14, lower leaf packer 16, interior compression packer 15, higher slice packer 13, annular space safe containment device
10, inner tube is then descended again, outer wall of inner tube is relatively easy, the small silk plug 20 of tail band and interior screen casing to after position under annulus safety valve 6
14, top has sealing plug 7 and inner tube safety valve 8, and the sealing plug is used in addition to cooperation annulus safety valve, packing
Outside annular location, it also has the function of positioning inner tube position.Former first lower outer pipe has been abandoned in entire construction, descends inner tube afterwards, so
It is followed by dual control safety valve, thereafter lower outer pipe again, finally descends these cumbersome processes of inner tube and thus bring tests that envelope is cumbersome to ask
Topic, the construction only need two steps that can complete, and it is simpler to test envelope.
The inner equilibrium packer 19, outer balance packer 18, lower leaf packer 16, interior compression packer 15, on
Layer separating packer 13, annular space safe containment device 10 are connected to ground control system 1, the annular space safety by liquid controling pipe line 3
Valve is connected to ground control system by liquid controling pipe line 5, while it is internally integrated seal operation cylinder and alternate channel, described
Inner tube safety valve is connected to ground control system by liquid controling pipe line 4, and the liquid controling pipe line 3 and liquid controling pipe line 5 pass through protection
Clamp is fixed on 11 top of outer tube, and the liquid controling pipe line 4 is by protecting clamp to be fixed on 12 top of inner tube.
When normal injection, the liquid controling pipe line 3 is suppressed to certain value by ground control system 1, inner equilibrium is insulated
Device 19, outer balance packer 18, lower leaf packer 16, interior compression packer 15, higher slice packer 13, annular space safe containment
10 packing element of device is set, and wherein packing inner and outer pipes annular space, annular space is inwardly compressed in inner equilibrium packer and interior compression packer
When safe containment device reaches certain pressure, packing element is set, this packer is once suppressed simultaneous with locking device, forever
Sitting envelope, then liquid controling pipe line 4 is suppressed to certain value, pushes lower valve plates open, it is unimpeded to realize that inner tube flows to, finally by liquid controling pipe line
5 suppress to certain value, open the sliding sleeve of control inner and outer pipes annular space, realize that inner and outer pipes annular space is unimpeded；Outer tube injection
Water successively passes through waterflood path 9 on annulus safety valve, the outer screen pipe 14 on upper layer, higher slice packer and lower leaf packer
Annular space injects upper oil reservoir, and inner tube injection water successively passes through inner tube safety valve, sealing plug, interior screen casing, interior compression packer
It is infused with the annular space of the annular space of inner equilibrium packer, the outer screen pipe of lower layer, lower leaf packer and outer balance packer
Enter lower oil reservoir.Meanwhile when normally filling the water, packing element bearing up-down force is balance, reduces water filling operating condition variation bring
String creep improves the tubing string service life, and when liquid controling pipe line failure, the waterflood path of annulus safety valve and inner tube safety valve is not
It can normally open, can be opened by injection water, when water injection pressure reaches certain value, cut the shear pin of spare waterflood path,
Water injection valve is pushed, equally can be realized normal water filling.
When needing reacting cycle well-flushing, by ground control system 1 by 3 pressure release of liquid controling pipe line, interior compression packer,
Inner equilibrium packer and higher slice packer, lower leaf packer, outer balance packer unseal completely, realize that inner and outer pipes connect
It is logical, it realizes the requirement of huge discharge anti-flushing well, enables inner tube and outer tube Safety Purge.
When water filling is abnormal, by ground control system 1 by 5 automatically unloading of the liquid controling pipe line 4 and liquid controling pipe line,
Under the action of the spring, piston retraction, valve plate is automatically closed for inner tube safety valve and annulus safety valve, at this time annular space safe containment device according to
So in the state that sets, realizes the rapid closing of the entire pit shaft under abnormal conditions, meet maritime safety environmental requirement.
The foregoing is merely presently preferred embodiments of the present invention, non-to limit the scope of the patents of the invention, other are with this
The equivalence changes of the patent spirit of invention should all belong to the scope of the patents of the invention.
Claims (3)
1. the long-acting two-tube water injection string of independent safety, which is characterized in that including the inner tube being independently arranged and be independently arranged
Outer tube, the setting of said inner tube coaxial-type in outer tube, said inner tube center cavity as the interior waterflood path for being connected to lower oil reservoir,
Annular space is formed by between said inner tube and outer tube as the outer waterflood path for being connected to upper oil reservoir, the inner and outer pipe upper end with
And the annular space position between outer tube upper end outer wall and casing is respectively provided with safety control, respectively inner tube safety valve, annular space peace
Full valve and annular space safe containment device control three inner tube, inner and outer pipes annular space and outer tube and casing annulus axial passages respectively,
It is totally-enclosed when the realization pit shaft state of emergency；Said inner tube lower end connects interior water injection string, the outer water filling of outer tube lower end connection
Tubing string；
The interior water injection string, including interior screen casing, small silk plug, said inner tube bottom end connect interior screen casing, the corresponding lower section of interior screen casing
The bottom end opening of outer screen pipe and lower oil reservoir, water injection string blocks small silk plug, between the interior water injection string and outer water injection string
Compression packer in installing, position of the interior compression packer between upper and lower two outer screen pipes, the interior screen casing lower end outer wall
Inner equilibrium packer is installed between the outer screen pipe outer wall of lower section, inner equilibrium packer is located at lower oil reservoir lower position；
The annulus safety valve upper end is connected to ground control system by liquid controling pipe line, internal equipped with seal operation cylinder and spare
Waterflood path；The inner tube safety valve upper end equally passes through liquid controling pipe line and is connected to ground control system, and inside is again provided with
Spare waterflood path；Said inner tube tubing string upper end is additionally provided with sealing plug, with the seal operation inside the annulus safety valve
Cylinder is used cooperatively.
2. the long-acting two-tube water injection string of independent safety according to claim 1, which is characterized in that the outer water injection pipe
Column, including sequentially connected two outer screen pipes, the outer tube bottom end are sequentially connected two outer screen pipes up and down, wherein the outer sieve of top
The corresponding upper oil reservoir of pipe, the corresponding lower oil reservoir of the outer screen pipe of lower section, and also the outer screen pipe upper end outer wall of top installs layer separating packer,
The outer screen pipe upper end outer wall of lower section installs lower leaf packer, and higher slice packer is located at upper oil reservoir top position, lower leaf envelope
It is located at lower oil reservoir top position every device, the outer screen pipe lower end outer wall of lower section is equipped with outer balance packer, outer balance packer position
In lower oil reservoir lower position, the water injection string bottom end opening blocks big silk plug.
3. the long-acting two-tube water injection string of independent safety according to claim 1, which is characterized in that the annular space safety
Packer, higher slice packer, lower leaf packer, interior compression packer, outer balance packer, inner equilibrium packer pass through
A piece liquid controling pipe line is connected to ground control system, and the annular space safe containment device has locking device, suppressed by ground
It once sets, pressure release does not unseal, and higher slice packer, lower leaf packer, interior compression packer, outer balance packer, interior
Balancing packer is to suppress to set, and realizes seperated layer water injection, and pressure release packing element unseals completely, realizes the huge discharge anti-flushing well of pit shaft.
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| CN201510489189.XA CN106437641B (en) | 2015-08-11 | 2015-08-11 | The long-acting two-tube water injection string of independent safety |
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| CN201510489189.XA CN106437641B (en) | 2015-08-11 | 2015-08-11 | The long-acting two-tube water injection string of independent safety |
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| CN106437641B true CN106437641B (en) | 2018-12-04 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108222853B (en) * | 2017-05-02 | 2019-08-09 | 中国石油化工股份有限公司 | A kind of two-tube water injection string of offshore oilfield and method |
| CN106988712B (en) * | 2017-06-09 | 2023-05-23 | 上海飞舟博源石油装备股份有限公司 | Single-pipe column multi-pipe type oilfield layered water injection device and water injection and backwashing method thereof |
| CN109252834B (en) * | 2017-07-13 | 2024-05-24 | 中国石油化工股份有限公司 | Concentric double-channel long-acting layered water injection device and method |
| CN112709556B (en) * | 2019-10-24 | 2022-12-06 | 中国石油化工股份有限公司 | Rapid well completion pipe string for offshore oilfield water injection well and construction method |
| CN114482949B (en) * | 2020-10-27 | 2023-08-22 | 中国石油天然气股份有限公司 | Pressurizing water injection device |
| CN114607326A (en) * | 2021-11-11 | 2022-06-10 | 孙承跃 | Wellhead partial pressure water injection method and device for ground seal inspection and single-layer independent well flushing |
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