CN209261535U - A kind of delayed start-up toe-end sliding sleeve - Google Patents
A kind of delayed start-up toe-end sliding sleeve Download PDFInfo
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- CN209261535U CN209261535U CN201821782468.0U CN201821782468U CN209261535U CN 209261535 U CN209261535 U CN 209261535U CN 201821782468 U CN201821782468 U CN 201821782468U CN 209261535 U CN209261535 U CN 209261535U
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Abstract
The utility model discloses a kind of delayed start-up toe-end sliding sleeves, the upper housing top and bottom of sliding sleeve are fixedly connected with top connection outer wall and transition joint outer wall respectively and seal cooperation, lower case top and bottom are fixedly connected with transition joint outer wall and lower contact outer wall respectively and seal cooperation, upper center tube upper end and the sealing of top connection inner wall cooperate, lower end is fixedly connected with transition joint inner wall and seals cooperation, lower center tube upper end is fixedly connected with transition joint inner wall and seals cooperation, and lower end and the sealing of lower contact inner wall cooperate；Upper time-delay mechanism is arranged in transition joint upper end, and opener is set to inside transition joint；Upper housing has been arranged radially pressure break collar extension, and upper center tube corresponds to pressure break collar extension and has been disposed radially pressure break internal orifice, is closed between pressure break collar extension and pressure break internal orifice by the unlatching piston of upper time-delay mechanism.It is harsh and open the technical problems such as success rate is low to can effectively solve the toe-end sliding sleeve cracking pressure error range in the presence of the prior art using the utility model.
Description
Technical field
The utility model relates to a kind of delayed start-up toe-end sliding sleeves to belong to for realizing shale gas well first section fracturing reform
The manufacturing technology field of industrial gas oil underground operation tool.
Background technique
At present there are two types of shale gas well first section fracturing reform modes: one is coiled tubing transmission perforations；Another kind is toe
Hold sliding sleeve.Coiled tubing transmission perforation mode technology maturation is reliable, but timeliness of constructing is low, and tripping in is limited in ultra-long horizontal well；
Toe-end sliding sleeve mode directly builds the pressure unlatching, and construction timeliness is high, is not limited by horizontal section length.Toe-end sliding sleeve is relative to continuous oil
Pipe transmission perforation mode has the advantages such as operation timeliness is high, at low cost, risk is small, depth of implements is unrestricted, but since toe-end is sliding
Set technology is immature, and unlatching success rate is low, and shale gas first section pressure break channel is still based on coiled tubing transmission perforation at present.Due to
Shale gas reservoir permeability is extremely low, and shale gas yield and drilling hole number and pressure break scale are closely related, continuous with drilling technology
Progress, ultra-long horizontal section (2500 meters or more) horizontal well by be Efficient Development shale gas development trend, coiled tubing transmission penetrates
Hole mode has been unable to meet deep layer, ultra-long horizontal well first section pressure break perforation demand.
Existing toe-end sliding sleeve technology unlatching success rate is low, is primarily present following technological deficiency:
1, need full well pressure testing 90MPa to examine pit shaft leakproofness before domestic shale gas well pressing crack construction, the current country makes
It is 15000psi with ground high pressure pipe joint pressure-bearing grade, highest pressure limiting does not allow more than 100MPa when construction, therefore, existing toe-end
Sliding sleeve, which opens pump pressure, to allow cracking pressure error range harsh within the scope of 90-100MPa.
2, existing toe-end sliding sleeve is largely opened by the way of rupture, to its cracking pressure after cement slurry sets
There is larger impact, causes toe-end sliding sleeve to open success rate lower.
Summary of the invention
The purpose of the utility model is to overcome the above problems of the existing technology, and it is sliding to provide a kind of delayed start-up toe-end
Set.Can effectively solve using the utility model toe-end sliding sleeve cracking pressure error range in the presence of the prior art it is harsh and
Open the technical problems such as success rate is low.
To achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of delayed start-up toe-end sliding sleeve, including top connection, upper housing, upper time-delay mechanism, upper center tube, transition joint,
Opener, lower center tube, lower case and lower contact, upper housing top and bottom are respectively and outside top connection outer wall and transition joint
Wall is fixedly connected with and seals cooperation, lower case top and bottom be fixedly connected respectively with transition joint outer wall and lower contact outer wall and
Sealing cooperation, upper center tube upper end and the sealing of top connection inner wall cooperate, and lower end, which is fixedly connected and seals with transition joint inner wall, matches
It closes, lower center tube upper end is fixedly connected with transition joint inner wall and seals cooperation, and lower end and the sealing of lower contact inner wall cooperate；On prolong
When mechanism be arranged in transition joint upper end, and between upper housing and upper center tube, opener is set in transition joint
Portion；Upper housing has been arranged radially pressure break collar extension, and upper center tube corresponds to pressure break collar extension and has been disposed radially pressure break internal orifice, pressure break collar extension
It is closed between pressure break internal orifice by the unlatching piston of upper time-delay mechanism；When wellbore fluid reaches setup pressure value, machine is opened
Structure starting drives upper time-delay mechanism's starting, and it is mobile until pressure break collar extension and pressure break internal orifice to open piston for promotion after setting duration
It communicates.
The utility model further includes lower time-delay mechanism, and lower time-delay mechanism is arranged in transition joint lower end, and is located at lower case
Between lower center tube, lower case has been disposed radially pressure break collar extension, and pressure break collar extension is corresponded on lower center tube and has been disposed radially
Pressure break internal orifice is closed between pressure break collar extension and pressure break internal orifice by the unlatching piston of lower time-delay mechanism；It is set when wellbore fluid reaches
When level pressure force value, opener starting drives the starting of lower time-delay mechanism, the unlatching of mechanism when pushing downward after setting duration
Piston is mobile until pressure break collar extension is communicated with pressure break internal orifice.
The upper time-delay mechanism is identical with lower time-delay mechanism structure, and upper time-delay mechanism's structure includes opening air chamber, opening
Piston, delay chamber and damping mouth, open piston by unlatching shear pin be fixed on central tube, and respectively with upper housing and upper center
Seal of tube cooperation, damping mouth are connect by threaded coaxial with transition joint and seal cooperation；Pipe and shell centered on unlatching air chamber
Gap between body, and be located at and open between piston and damping mouth；The gap being delayed centered on chamber between pipe and shell, and be located at
It opens between piston and connector.
The transition joint has been arranged radially control hole, is axially provided with pressure transmission hole, and control hole is connected to pressure transmission hole.
The opener includes sealing-plug and control piston, and sealing-plug is radially connected by screw thread with transition joint, and
It seals and cooperates with control hole, control piston is fixed on inside sealing-plug by controlling shear pin, and is sealed and cooperated with sealing-plug inner wall；
When control shear pin is cut, when opener starts, control piston motion to sealing-plug bottom, liquid flows into pressure transmission hole through overdamp
Mouth flows into delay chamber.
Be provided with overcurrent annular groove in the control hole, when controlling piston motion to sealing-plug bottom, control piston with it is close
Moved down at the sealing cooperation of blocking, liquid pass sequentially through control piston and sealing-plug between gap and shear pin interporal lacuna entered
Annular groove is flowed, then pressure transmission hole is flowed by the gap between sealing-plug and control hole.
Radial flowing hole is provided on the sealing-plug, flowing hole is connected to overcurrent annular groove, and control piston motion is to close
When blocking bottom, liquid pass sequentially through control piston and sealing-plug between gap, flowing hole, overcurrent annular groove and sealing-plug with
Gap between control hole flows into pressure transmission hole.
The upper center tube upper end and top connection inner wall co-axial seal cooperate, and lower end and transition joint are connected by threaded coaxial
Connect and seal cooperation, lower center tube upper end connect by threaded coaxial with transition joint and seal cooperation, in lower end and lower contact
The cooperation of wall co-axial seal.
The upper time-delay mechanism and lower time-delay mechanism are symmetrically disposed on transition joint both ends, lower case and upper housing structure phase
Together, lower center tube is identical as upper center tube structure.
The sealing-plug is closed at one end, and other end perforation, perforation end is connected to pit shaft inner cavity.
Using utility model has the advantages that
1, opener replaces rupture disc structures using piston cylinder operator, makes it have isolation cement slurry function, reduces
Cracking pressure error reduces the influence after cement slurry sets to toe-end sliding sleeve cracking pressure.
2, time-delay mechanism can open sliding sleeve by one section of delay process, expand toe-end lower than starting under pressure test pressure
Sliding sleeve cracking pressure allowable error range, improves unlatching success rate.
3, using double acting time-delay mechanism organization plan, two pressure break channels can be opened, and are independent of each other, unlatching is improved
Success rate.
4, the utility model is for realizing shale gas well first section fracturing reform, in the presence of can effectively solve the prior art
Toe-end sliding sleeve cracking pressure error range is harsh and opens the technical problems such as success rate is low, can effectively reduce shale gas exploitation at
This, has a extensive future.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is that the liquid after the starting of the utility model opener flows to enlarged diagram；
In the figure, it is marked as 1, top connection, 2, upper housing, 3, upper time-delay mechanism, 4, upper center tube, 5, transition joint, 6, open
Open mechanism, 7, lower time-delay mechanism, 8, lower center tube, 9, lower case, 10, lower contact, 11, open air chamber, 12, open piston,
13, pressure break internal orifice, 14, pressure break collar extension, 15, unlatching shear pin, 16, delay chamber, 17, damping mouth, 18, pressure transmission hole, 19, control work
Plug, 20, sealing-plug, 21, control hole, 22, control shear pin.
Specific embodiment
Embodiment 1
A kind of delayed start-up toe-end sliding sleeve, including top connection 1, upper housing 2, upper time-delay mechanism 3, upper center tube 4, in indirectly
First 5, opener 6, lower center tube 8, lower case 9 and lower contact 10,2 top and bottom of upper housing respectively with 1 outer wall of top connection
Be fixedly connected with and seal cooperation with 5 outer wall of transition joint, 9 top and bottom of lower case respectively with 5 outer wall of transition joint and under connect
First 10 outer wall is fixedly connected with and seals cooperation, and 4 upper end of upper center tube and the sealing of 1 inner wall of top connection cooperate, lower end and transition joint 5
Inner wall is fixedly connected with and seals cooperation, and 8 upper end of lower center tube is fixedly connected with 5 inner wall of transition joint and seals cooperation, lower end with
The sealing cooperation of 10 inner wall of lower contact；Upper time-delay mechanism 3 is arranged in 5 upper end of transition joint, and is located at upper housing 2 and upper center tube 4
Between, opener 6 is set to inside transition joint 5；Upper housing 2 has been arranged radially pressure break collar extension 14, the corresponding pressure of upper center tube 4
It splits collar extension 14 and has been disposed radially pressure break internal orifice 13, opening by upper time-delay mechanism 3 between pressure break collar extension 14 and pressure break internal orifice 13
Open the closing of piston 12；When wellbore fluid reaches setup pressure value, the starting of opener 6 drives upper time-delay mechanism 3 to start, and passes through
It is pushed after setting duration and opens the movement of piston 12 until pressure break collar extension 14 is communicated with pressure break internal orifice 13.
The utility model further includes lower time-delay mechanism 7, and lower time-delay mechanism 7 is arranged in 5 lower end of transition joint, and is located at lower casing
Between body 9 and lower center tube 8, lower case 9 has been disposed radially pressure break collar extension, and pressure break collar extension is corresponded on lower center tube 8 radially
It is provided with pressure break internal orifice, is closed between pressure break collar extension and pressure break internal orifice by the unlatching piston of lower time-delay mechanism 7；Work as wellbore fluid
When reaching setup pressure value, opener starting drives lower time-delay mechanism 7 to start, mechanism when pushing downward after setting duration
7 unlatching piston is mobile until pressure break collar extension is communicated with pressure break internal orifice.
The upper time-delay mechanism 3 is identical with lower 7 structure of time-delay mechanism, upper 3 structure of time-delay mechanism include open air chamber 11,
Piston 12, delay chamber 16 and damping mouth 17 are opened, piston 12 is opened and is fixed on upper center tube 4 by opening shear pin 15, and point
Do not cooperate with upper housing 2 and the sealing of upper center tube 4, damping mouth 17 is connect by threaded coaxial with transition joint 5 and seals cooperation；
The gap between shell is managed centered on unlatching air chamber, and is located at and is opened between piston and connector；Be delayed chamber centered on pipe with
Gap between shell, and be located at and open between piston and damping mouth.
The transition joint 5 has been arranged radially control hole 21, is axially provided with pressure transmission hole 18, control hole 21 and pressure transmission hole 18
Connection.
The opener 6 includes sealing-plug 20 and control piston 19, and sealing-plug 20 and transition joint 5 pass through screw thread radial direction
Connection, and with control hole 21 seal cooperate, control piston 19 by control shear pin 22 be fixed on inside sealing-plug 20, and with sealing
Fill in the sealing cooperation of 20 inner walls；When control shear pin 22 is cut, when opener 6 starts, control piston 19 moves to 20 bottom of sealing-plug
Portion, liquid flow into pressure transmission hole 18 and flow into delay chamber 16 through overdamp mouth 17.
Overcurrent annular groove is provided in the control hole 21, when control piston 19 moves to 20 bottom of sealing-plug, control is lived
Plug 19 with moved down at the sealing cooperation of sealing-plug 20, liquid passes sequentially through the gap controlled between piston 19 and sealing-plug 20 and cuts
Nail hole gap enters overcurrent annular groove, then flows into pressure transmission hole 18 by the gap between sealing-plug 20 and control hole 21.
It is provided with radial flowing hole on the sealing-plug 20, flowing hole is connected to overcurrent annular groove, and control piston 19 moves
When to 20 bottom of sealing-plug, liquid passes sequentially through gap between control piston 19 and sealing-plug 20, flowing hole, overcurrent annular groove
Gap between sealing-plug 20 and control hole 21 flows into pressure transmission hole 18.
4 upper end of upper center tube and 1 inner wall co-axial seal of top connection cooperate, and lower end is same by screw thread with transition joint 5
Axis connection and sealing cooperation, 8 upper end of lower center tube connect by threaded coaxial with transition joint 5 and seal cooperation, and lower end is under
The cooperation of 10 inner wall co-axial seal of connector.
The upper time-delay mechanism 3 is symmetrically disposed on 5 both ends of transition joint with lower time-delay mechanism 7.
The sealing-plug 20 is closed at one end, and other end perforation, perforation end is connected to pit shaft inner cavity.
The lower case 9 is identical as 2 structure of upper housing, and lower center tube 8 is identical as 4 structure of upper center tube.
Embodiment 2
As the preferred forms of the utility model, as shown, its mainly include top connection 1, upper housing 2, on prolong
When mechanism 3, upper center tube 4, transition joint 5, opener 6, lower time-delay mechanism 7, lower center tube 8, lower case 9 and lower contact
10,2 upper and lower end of upper housing is connect by threaded coaxial with top connection 1, transition joint 5 respectively and seals cooperation, under described
9 upper and lower end of shell connect with transition joint 5, lower contact 10 by threaded coaxial respectively and seals cooperation, the upper center tube 4
Upper end and 1 inner wall co-axial seal of top connection cooperate, and lower end connect by threaded coaxial with transition joint 5 and seal cooperation, described
8 upper end of lower center tube connect by threaded coaxial with transition joint 5 and seals cooperation, lower end and 10 inner wall co-axial seal of lower contact
Cooperation.The upper time-delay mechanism 3 is symmetrically disposed on 5 both ends of transition joint with lower time-delay mechanism 7, and is located at shell and center simultaneously
Between pipe, the opener 6 is set to inside transition joint 5.
In the present embodiment, upper housing 2 has been arranged radially pressure break collar extension 14, and the lower case 9 is identical as 2 structure of upper housing.
In the present embodiment, upper center tube 4 has been arranged radially pressure break internal orifice 13, the lower center tube 8 and 4 structure of upper center tube
It is identical.
In the present embodiment, transition joint 5 has been arranged radially control hole 21, is axially provided with pressure transmission hole 18, the control hole
Overcurrent annular groove is provided in 21.
In the present embodiment, upper time-delay mechanism 3 is mainly by unlatching air chamber 11, unlatching piston 12, delay chamber 16 and damping mouth
17 compositions, the unlatchings piston 12 are fixed on 4 outer surface of upper center tube by unlatching shear pin 15, and simultaneously with upper housing 2 and upper
The sealing cooperation of central tube 4, the damping mouth 17 connect by threaded coaxial with transition joint 5 and seal cooperation, the lower delay
Mechanism 7 is identical as upper 3 structure of time-delay mechanism.
In the present embodiment, opener 6 is mainly made of sealing-plug 20 and control piston 19, the sealing-plug 20 and centre
Connector 5 is radially connected by screw thread, and seals and cooperate with control hole 21, and the control piston 19 is fixed on by controlling shear pin 22
Inside sealing-plug 20, and seals and cooperate with 20 inner wall of sealing-plug.
Its workflow and principle are as follows:
Contraction in Site carries out full wellbore pressure test, and when wellbore fluid reaches setup pressure value, control shear pin 22 is cut,
Control piston 19 falls into 20 bottom of sealing-plug, i.e. opener 6 starts, and liquid, which flows into pressure transmission hole 18 by overcurrent annular groove, to be passed through
It damps mouth 17 to flow into delay chamber 16, Ji Shang time-delay mechanism 3 starts, by setting duration, when delay 16 fluid of chamber reaches setting
It when pressure value, opens shear pin 15 and cuts, can push to open to move up on piston 12 and open air chamber 11, until pressure break collar extension 14
It is communicated with pressure break internal orifice 13, similarly, lower time-delay mechanism 7 is also started up, i.e., toe-end sliding sleeve opens two pressure break channels simultaneously.
Claims (8)
1. a kind of delayed start-up toe-end sliding sleeve, it is characterised in that: including top connection (1), upper housing (2), upper time-delay mechanism (3),
Upper center tube (4), transition joint (5), opener (6), lower center tube (8), lower case (9) and lower contact (10), upper housing
(2) top and bottom are fixedly connected with and seal cooperation, lower case (9) with top connection (1) outer wall and transition joint (5) outer wall respectively
Top and bottom are fixedly connected with and seal cooperation, upper center tube (4) with transition joint (5) outer wall and lower contact (10) outer wall respectively
Upper end and the sealing of top connection (1) inner wall cooperate, and lower end is fixedly connected with transition joint (5) inner wall and seals cooperation, lower center tube
(8) upper end is fixedly connected with and seals cooperation with transition joint (5) inner wall, and lower end and the sealing of lower contact (10) inner wall cooperate；On prolong
When mechanism (3) be arranged in transition joint (5) upper end, and between upper housing (2) and upper center tube (4), opener (6) is set
It is internal to be placed in transition joint (5)；Upper housing (2) has been arranged radially pressure break collar extension (14), the corresponding pressure break collar extension of upper center tube (4)
(14) it has been disposed radially pressure break internal orifice (13), has passed through upper time-delay mechanism (3) between pressure break collar extension (14) and pressure break internal orifice (13)
Unlatching piston (12) closing；When wellbore fluid reaches setup pressure value, opener (6) starting drives upper time-delay mechanism
(3) start, pushed after setting duration and open piston (12) movement until pressure break collar extension (14) are communicated with pressure break internal orifice (13).
2. a kind of delayed start-up toe-end sliding sleeve according to claim 1, it is characterised in that: under the toe-end sliding sleeve further includes
Time-delay mechanism (7), lower time-delay mechanism (7) are arranged in transition joint (5) lower end, and be located at lower case (9) and lower center tube (8) it
Between, lower case (9) has been disposed radially pressure break collar extension, corresponds to pressure break collar extension on lower center tube (8) and has been disposed radially in pressure break
Mouthful, it is closed between pressure break collar extension and pressure break internal orifice by the unlatching piston of lower time-delay mechanism (7)；When wellbore fluid reaches setting pressure
When force value, opener (6) starting drives lower time-delay mechanism (7) starting, mechanism (7) when pushing downward after setting duration
It is mobile up to pressure break collar extension is communicated with pressure break internal orifice to open piston.
3. a kind of delayed start-up toe-end sliding sleeve according to claim 2, it is characterised in that: the upper time-delay mechanism (3) and
Lower time-delay mechanism (7) structure is identical, and upper time-delay mechanism's (3) structure includes opening air chamber (11), opening piston (12), delay chamber
(16) with damping mouth (17), open piston (12) by open shear pin (15) be fixed on upper center tube (4), and respectively with upper casing
Body (2) and upper center tube (4) sealing cooperation, damping mouth (17) are connect by threaded coaxial with transition joint (5) and seal cooperation；
The gap between shell is managed centered on unlatching air chamber, and is located at and is opened between piston and connector；Be delayed chamber centered on pipe with
Gap between shell, and be located at and open between piston and damping mouth.
4. a kind of delayed start-up toe-end sliding sleeve according to claim 3, it is characterised in that: the transition joint (5) is radial
Control hole (21) are provided with, are axially provided with pressure transmission hole (18), and control hole (21) is connected to pressure transmission hole (18).
5. a kind of delayed start-up toe-end sliding sleeve according to claim 4, it is characterised in that: the opener (6) includes
Sealing-plug (20) and control piston (19), sealing-plug (20) is radially connected by screw thread with transition joint (5), and and control hole
(21) sealing cooperation, by controlling shear pin (22), to be fixed on sealing-plug (20) internal for control piston (19), and with sealing-plug (20)
Inner wall sealing cooperation；When control shear pin (22) is cut, and opener (6) starts, control piston (19) moves to sealing-plug
(20) bottom, liquid flow into pressure transmission hole (18) and flow into delay chamber (16) through overdamp mouth (17).
6. a kind of delayed start-up toe-end sliding sleeve according to claim 5, it is characterised in that: setting in the control hole (21)
There is overcurrent annular groove, when control piston (19) moves to sealing-plug (20) bottom, control piston (19) is close with sealing-plug (20)
Envelope cooperation at move down, liquid pass sequentially through control piston (19) and sealing-plug (20) between gap and shear pin interporal lacuna entered
Annular groove is flowed, then pressure transmission hole (18) are flowed by the gap between sealing-plug (20) and control hole (21).
7. a kind of delayed start-up toe-end sliding sleeve according to claim 6, it is characterised in that: be arranged on the sealing-plug (20)
Have radial flowing hole, flowing hole is connected to overcurrent annular groove, and control piston (19) is when moving to sealing-plug (20) bottom, liquid according to
Secondary gap, flowing hole, overcurrent annular groove and sealing-plug (20) and control by between control piston (19) and sealing-plug (20)
Gap between hole (21) flows into pressure transmission hole (18).
8. a kind of delayed start-up toe-end sliding sleeve according to claim 7, it is characterised in that: upper center tube (4) upper end
Cooperate with top connection (1) inner wall co-axial seal, lower end connect by threaded coaxial with transition joint (5) and seals cooperation, it is lower in
Heart pipe (8) upper end connect by threaded coaxial with transition joint (5) and seals cooperation, and lower end and lower contact (10) inner wall are coaxially close
Envelope cooperation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821782468.0U CN209261535U (en) | 2018-10-31 | 2018-10-31 | A kind of delayed start-up toe-end sliding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821782468.0U CN209261535U (en) | 2018-10-31 | 2018-10-31 | A kind of delayed start-up toe-end sliding sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN209261535U true CN209261535U (en) | 2019-08-16 |
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ID=67559365
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821782468.0U Active CN209261535U (en) | 2018-10-31 | 2018-10-31 | A kind of delayed start-up toe-end sliding sleeve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296348A (en) * | 2018-10-31 | 2019-02-01 | 中国石油集团川庆钻探工程有限公司 | Delayed start-up toe-end sliding sleeve |
| CN115199248A (en) * | 2021-03-25 | 2022-10-18 | 中石化石油工程技术服务有限公司 | Toe end sliding sleeve electric control hydraulic locking device |
| US11473401B2 (en) | 2020-02-05 | 2022-10-18 | University Of Electronic Science And Technology Of China | Method for controlling toe-end sliding sleeve of horizontal well based on efficient decoding communication |
-
2018
- 2018-10-31 CN CN201821782468.0U patent/CN209261535U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296348A (en) * | 2018-10-31 | 2019-02-01 | 中国石油集团川庆钻探工程有限公司 | Delayed start-up toe-end sliding sleeve |
| CN109296348B (en) * | 2018-10-31 | 2023-09-15 | 中国石油集团川庆钻探工程有限公司 | Toe end sliding sleeve capable of being opened in time delay mode |
| US11473401B2 (en) | 2020-02-05 | 2022-10-18 | University Of Electronic Science And Technology Of China | Method for controlling toe-end sliding sleeve of horizontal well based on efficient decoding communication |
| CN115199248A (en) * | 2021-03-25 | 2022-10-18 | 中石化石油工程技术服务有限公司 | Toe end sliding sleeve electric control hydraulic locking device |
| CN115199248B (en) * | 2021-03-25 | 2024-04-26 | 中石化石油工程技术服务有限公司 | Toe end sliding sleeve electric control hydraulic locking device |
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