CN209261536U - A kind of piston type delayed start-up toe-end sliding sleeve - Google Patents
A kind of piston type delayed start-up toe-end sliding sleeve Download PDFInfo
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- CN209261536U CN209261536U CN201821811355.9U CN201821811355U CN209261536U CN 209261536 U CN209261536 U CN 209261536U CN 201821811355 U CN201821811355 U CN 201821811355U CN 209261536 U CN209261536 U CN 209261536U
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- piston
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- toe
- pressure break
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Abstract
The utility model discloses a kind of piston type delayed start-up toe-end sliding sleeves, including top connection, shell, time-delay mechanism, central tube, opener and lower contact, top connection and lower contact connect with shell top and bottom respectively and seal cooperation, central tube upper end connect with top connection and seals cooperation, lower end and lower contact sealing cooperate, time-delay mechanism is set between shell and central tube, and opener is set in lower contact；Shell has been arranged radially pressure break collar extension, and central 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 time-delay mechanism；When wellbore fluid reaches setup pressure value, opener starting drives time-delay mechanism's starting, pushes unlatching piston is mobile until pressure break collar extension is communicated with pressure break internal orifice after setting duration.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 piston type delayed start-up toe-end sliding sleeves, change for realizing shale gas well first section pressure break
It makes, belongs to 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,
It 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, provide a kind of piston type delayed start-up
Toe-end sliding sleeve.The toe-end sliding sleeve cracking pressure error range that can effectively solve in the presence of the prior art using the utility model is severe
The technical problems such as quarter and unlatching success rate are low.
To achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of piston type delayed start-up toe-end sliding sleeve, it is characterised in that: including top connection, shell, time-delay mechanism, center
Pipe, opener and lower contact, top connection and lower contact connect with shell top and bottom respectively and seal cooperation, on central tube
End connect with top connection and seals cooperation, and lower end and lower contact sealing cooperate, and time-delay mechanism is set between shell and central tube,
Opener is set in lower contact；Shell has been arranged radially pressure break collar extension, and central 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 time-delay mechanism；When wellbore fluid reaches setting
When pressure value, opener starting drives time-delay mechanism's starting, pushes unlatching piston mobile until pressure break after setting duration
Collar extension is communicated with pressure break internal orifice.
Be provided with step on outer wall in the middle part of the central tube, be axially provided with clearance hole at step, and stepped outer surface with
Inner walls sealing cooperation.
The time-delay mechanism includes opening air chamber, opening piston, is delay chamber, batching pig, damping mouth, filter plate, hydraulic
Oil pocket and delay piston open air chamber, manage the gap between shell centered on be delayed chamber and hydraulic oil Qiang Zhuo, open air
Chamber is located at top connection and opens between piston, and delay chamber is in open between piston and central tube step, hydraulic fluid chamber is located at
Between heart pipe step and lower contact, open piston by unlatching shear pin and be fixed on center tube outer surface, and with shell and central tube
Sealing cooperation, batching pig is fixed on clearance hole close to delay chamber one end by cutting off, and seals and cooperate with clearance hole, and damping mouth connects
It is connected to the clearance hole other end, and seals and cooperates with clearance hole, filter plate setting is adjacent with damping mouth in hydraulic fluid chamber one end, delay
Piston is arranged in the hydraulic fluid chamber other end, and seals and cooperate with hydraulic fluid chamber, and hydraulic oil is injected in hydraulic fluid chamber.
The lower contact 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 lower contact, and with
Control hole sealing cooperation, control piston is fixed on inside sealing-plug by controlling shear pin, and is sealed and cooperated with sealing-plug inner wall；When
It controls shear pin to cut, when opener starts, controls piston motion to sealing-plug bottom, liquid enters hydraulic oil by pressure transmission hole
Chamber pushes delay piston to move up.
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 flows into pressure transmission 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 passes sequentially through gap, flowing hole and overcurrent annular groove between control piston and sealing-plug and flows into pressure transmission
Hole.
The delay piston moves up, and pushes hydraulic oil to enter damping mouth by filter plate and flows into clearance hole, works as clearance hole
When hydraulic oil reaches setup pressure value, cutting is cut off, hydraulic oil enters delay chamber start-up study mechanism, by setting duration, when
It when delay chamber hydraulic oil reaches setup pressure value, opens shear pin and cuts, push to open moving up into unlatching air chamber on piston, until
Pressure break collar extension is communicated with pressure break internal orifice.
The top connection and lower contact are connect with shell upper and lower side by threaded coaxial respectively, central tube upper end and top connection
It is connected by threaded coaxial, lower end and lower contact co-axial seal cooperate.
The damping mouth is connected to the clearance hole other end by threaded coaxial.
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, 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, shell, 3, time-delay mechanism, 4, central tube, 5, opener, 6, lower contact, 7,
Open air chamber, 8, open piston, 9, pressure break internal orifice, 10, pressure break collar extension, 11, open shear pin, 12, delay chamber, 13, cut off,
14, batching pig, 15, clearance hole, 16, damping mouth, 17, filter plate, 18, hydraulic fluid chamber, 19, delay piston, 20, pressure transmission hole, 21,
Control hole, 22, sealing-plug, 23, control piston, 24, control shear pin.
Specific embodiment
Embodiment 1
A kind of piston type delayed start-up toe-end sliding sleeve, including top connection 1, shell 2, time-delay mechanism 3, central tube 4, unlatching machine
Structure 5 and lower contact 6, top connection 1 and lower contact 6 connect with 2 top and bottom of shell respectively and seal cooperation, 4 upper end of central tube
Connect and seal cooperation with top connection 1, lower end and the sealing of lower contact 6 cooperate, time-delay mechanism 3 be set to shell 2 and central tube 4 it
Between, opener 5 is set in lower contact 6；Shell 2 has been arranged radially pressure break collar extension 10, corresponding 10 edge of pressure break collar extension of central tube 4
It has been arranged radially pressure break internal orifice 9, has been closed between pressure break collar extension 10 and pressure break internal orifice 9 by the unlatching piston 8 of time-delay mechanism 3；When
When wellbore fluid reaches setup pressure value, the starting of opener 5 drives time-delay mechanism 3 to start, and pushes and opens after setting duration
It is mobile up to pressure break collar extension 10 is communicated with pressure break internal orifice 9 to open piston 8.
It is provided with step on the 4 middle part outer wall of central tube, clearance hole 15, and stepped outer surface are axially provided at step
It seals and cooperates with 2 inner wall of shell.
The time-delay mechanism 3 includes opening air chamber 7, opening piston 8, delay chamber 12, batching pig 14, damping mouth 16, mistake
Filter plate 17, hydraulic fluid chamber 18 and delay piston 19 open air chamber 7, pipe 4 and shell centered on be delayed chamber 12 and 18 Zhuo of hydraulic fluid chamber
Gap between body 2, unlatching air chamber 7 are located at top connection 1 and open between piston 8, and delay chamber 12, which is located at, opens piston 8 in
Between 4 step of heart pipe, hydraulic fluid chamber 18 is located between 4 step of central tube and lower contact 6, opens piston 8 by opening shear pin 11
It is fixed on 4 outer surface of central tube, and is cooperated with shell 2 and the sealing of central tube 4, batching pig 14 is fixed on clearance hole by cutting off 13
15 close to delay 12 one end of chamber, and seal and cooperate with clearance hole 15, and damping mouth 16 is connected to 15 other end of clearance hole, and be isolated
The sealing cooperation of hole 15, the setting of filter plate 17 is adjacent with damping mouth 16 in 18 one end of hydraulic fluid chamber, and delay piston 19 is arranged hydraulic
18 other end of oil pocket, and seal and cooperate with hydraulic fluid chamber 18, hydraulic oil is injected in hydraulic fluid chamber 18.
The lower contact 6 has been arranged radially control hole 21, is axially provided with pressure transmission hole 20, and control hole 21 and pressure transmission hole 20 connect
It is logical.
The opener 5 includes sealing-plug 22 and control piston 23, and sealing-plug 22 is radially connected with lower contact 6 by screw thread
It connects, and seals and cooperate with control hole 21, control piston 23 is fixed on inside sealing-plug 22 by controlling shear pin 24, and and sealing-plug
The sealing cooperation of 22 inner walls；When control shear pin 24 is cut, when opener 5 starts, control piston 23 moves to 22 bottom of sealing-plug,
Liquid enters hydraulic fluid chamber 18 by pressure transmission hole 20 and delay piston 19 is pushed to move up.
Overcurrent annular groove is provided in the control hole 21, when control piston 23 moves to 22 bottom of sealing-plug, control is lived
Plug 23 with moved down at the sealing cooperation of sealing-plug 22, liquid passes sequentially through the gap controlled between piston 23 and sealing-plug 22 and cuts
Nail hole gap enters overcurrent annular groove, then flows into pressure transmission hole 20.
It is provided with radial flowing hole on the sealing-plug 22, flowing hole is connected to overcurrent annular groove, and control piston 23 moves
When to 22 bottom of sealing-plug, liquid passes sequentially through gap, flowing hole and overcurrent annular between control piston 23 and sealing-plug 22
Slot flows into pressure transmission hole 20.
The delay piston 19 moves up, and pushes hydraulic oil to enter damping mouth 16 by filter plate 17 and flows into clearance hole 15,
When 15 hydraulic oil of clearance hole reaches setup pressure value, 13 cuttings are cut off, hydraulic oil enters delay 12 start-up study mechanism 3 of chamber,
By setting duration, when 12 hydraulic oil of chamber that is delayed reaches setup pressure value, opens shear pin 11 and cut, push and open on piston 8
It moves up into and opens air chamber 7, until pressure break collar extension 10 is communicated with pressure break internal orifice 9.
The top connection 1 and lower contact 6 are connect with 2 upper and lower side of shell by threaded coaxial respectively, 4 upper end of central tube with it is upper
Connector 1 is connected by threaded coaxial, and lower end and 6 co-axial seal of lower contact cooperate.
The damping mouth 16 is connected to 15 other end of clearance hole by threaded coaxial.
The sealing-plug 22 is closed at one end, and other end perforation, perforation end is connected to pit shaft inner cavity.
Embodiment 2
As the preferred forms of the utility model, as shown, it mainly includes top connection 1, shell 2, delay machine
Structure 3, central tube 4, opener 5 and lower contact 6, the top connection 1 pass through screw thread with 2 upper and lower side of shell respectively with lower contact 6
Coaxially connected and sealing cooperation, 4 upper end of central tube connect by threaded coaxial with top connection 1 and seal cooperation, lower end and
The cooperation of 6 co-axial seal of lower contact, the time-delay mechanism 3 are set between shell 2 and central tube 4, and the opener 5 is set to
Inside lower contact 6.
In the present embodiment, shell 2 has been arranged radially pressure break collar extension 10.
In the present embodiment, central tube 4 has been arranged radially pressure break internal orifice 9, is axially provided at 4 middle bench of central tube
Clearance hole 15, and stepped outer surface and the sealing of 2 inner wall of shell cooperate.
In the present embodiment, time-delay mechanism 3 is mainly by unlatching air chamber 7, unlatching piston 8, delay chamber 12, batching pig 14, resistance
Buddhist nun's mouth 16, filter plate 17, hydraulic fluid chamber 18 and delay piston 19 form, and the unlatching piston 8 is fixed on by opening shear pin 11
4 outer surface of central tube, and cooperate simultaneously with shell 2 and the sealing of central tube 4, the batching pig 14 is fixed on isolation by cutting off 13
Hole 15 seals with clearance hole 15 and cooperates close to delay 12 one end of chamber, and the damping mouth 16 is connected to isolation by threaded coaxial
15 other end of hole, and seal and cooperate with clearance hole 15, the filter plate 17 is installed on 18 one end of hydraulic fluid chamber and damping 16 phase of mouth
Neighbour, the delay piston 19 is installed on 18 other end of hydraulic fluid chamber, and seals and cooperate with hydraulic fluid chamber 18, the hydraulic fluid chamber 18
Interior injection hydraulic oil.
In the present embodiment, lower contact 6 has been arranged radially control hole 21, is axially provided with pressure transmission hole 20, the control hole 21
Inside it is provided with overcurrent annular groove.
In the present embodiment, opener 5 is mainly made of sealing-plug 22 and control piston 23, and the sealing-plug 22 connects under
First 6 is radially connected by screw thread, and seals and cooperate with control hole 21, and the control piston 23 is fixed on close by control shear pin 24
Inside blocking 22, and seals and cooperate with 22 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 24 is cut,
Control piston 23 falls into 22 bottom of sealing-plug, i.e. opener starts, and liquid, which enters pressure transmission hole 20 by overcurrent annular groove, to be pushed
Delay piston 19 moves up, and delay piston 19 can push hydraulic oil to enter damping mouth 16 by filter plate 17 and flow into clearance hole 15
In, when 15 hydraulic oil of clearance hole reaches setup pressure value, 13 cuttings are cut off, hydraulic oil can enter delay chamber 12, that is, be delayed
Mechanism 3 starts, and by setting duration, when 12 hydraulic oil of chamber that is delayed reaches setup pressure value, opens shear pin 11 and cuts, can push away
Dynamic open moves up into unlatching air chamber 7 on piston 8, until pressure break collar extension 10 is communicated with pressure break internal orifice 9, i.e., toe-end sliding sleeve is opened.
Claims (10)
1. a kind of piston type delayed start-up toe-end sliding sleeve, it is characterised in that: including top connection (1), shell (2), time-delay mechanism
(3), central tube (4), opener (5) and lower contact (6), top connection (1) and lower contact (6) respectively with shell (2) upper end and
Lower end connection and sealing cooperation, central tube (4) upper end connect with top connection (1) and seal cooperation, and lower end and lower contact (6) seal
Cooperation, time-delay mechanism (3) are set between shell (2) and central tube (4), and opener (5) is set in lower contact (6)；Shell
Body (2) has been arranged radially pressure break collar extension (10), and central tube (4) corresponding pressure break collar extension (10) has been disposed radially pressure break internal orifice (9),
It is closed between pressure break collar extension (10) and pressure break internal orifice (9) by the unlatching piston (8) of time-delay mechanism (3)；When wellbore fluid reaches
When setup pressure value, opener (5) starting drives time-delay mechanism (3) starting, pushes after setting duration and opens piston (8)
Movement is until pressure break collar extension (10) are communicated with pressure break internal orifice (9).
2. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 1, it is characterised in that: the central tube (4)
It is provided with step on the outer wall of middle part, is axially provided at step clearance hole (15), and stepped outer surface and shell (2) inner wall seal
Cooperation.
3. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 2, it is characterised in that: the time-delay mechanism
(3) include open air chamber (7), open piston (8), delay chamber (12), batching pig (14), damping mouth (16), filter plate (17),
Hydraulic fluid chamber (18) and delay piston (19) are opened air chamber (7), delay chamber (12) and hydraulic fluid chamber and (are managed centered on 18) Zhuo
(4) gap between shell (2) opens air chamber (7) and is located at top connection (1) and opens between piston (8), is delayed chamber (12)
Positioned at opening between piston (8) and central tube (4) step, hydraulic fluid chamber (18) be located at central tube (4) step and lower contact (6) it
Between, piston (8) are opened by opening shear pin (11) and are fixed on central tube (4) outer surface, and close with shell (2) and central tube (4)
Envelope cooperation, batching pig (14) are fixed on clearance hole (15) close delay chamber (12) one end, and and clearance hole by cutting off (13)
(15) sealing cooperation, damping mouth (16) is connected to clearance hole (15) other end, and seals and cooperate with clearance hole (15), filter plate
(17) setting is adjacent with damping mouth (16) in hydraulic fluid chamber (18) one end, and delay piston (19) setting is another in hydraulic fluid chamber (18)
End, and seal and cooperate with hydraulic fluid chamber (18), hydraulic oil is injected in hydraulic fluid chamber (18).
4. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 3, it is characterised in that: the lower contact (6)
Control hole (21) have been arranged radially, have axially been provided with pressure transmission hole (20), and control hole (21) is connected to pressure transmission hole (20).
5. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 4, it is characterised in that: the opener
(5) include sealing-plug (22) and control piston (23), it is radially connected that sealing-plug (22) and lower contact (6) pass through screw thread, and with control
Drilling (21) seals cooperation, and control piston (23) is fixed on sealing-plug (22) inside, and and sealing-plug by controlling shear pin (24)
(22) inner wall sealing cooperation；When control shear pin (24) is cut, and opener (5) starts, control piston (23) moves to sealing
(22) bottom is filled in, liquid enters hydraulic fluid chamber (18) by pressure transmission hole (20) and delay piston (19) is pushed to move up.
6. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 5, it is characterised in that: the control hole (21)
It is inside provided with overcurrent annular groove, when control piston (23) moves to sealing-plug (22) bottom, controls piston (23) and sealing-plug
(22) it is moved down at sealing cooperation, liquid passes sequentially through between gap and shear pin hole between control piston (23) and sealing-plug (22)
Gap enters overcurrent annular groove, then flows into pressure transmission hole (20).
7. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 6, it is characterised in that: the sealing-plug (22)
On be provided with radial flowing hole, flowing hole is connected to overcurrent annular groove, and control piston (23) is when moving to sealing-plug (22) bottom,
Liquid passes sequentially through gap, flowing hole and overcurrent annular groove between control piston (23) and sealing-plug (22) and flows into pressure transmission hole
(20).
8. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 7, it is characterised in that: the delay piston
(19) it moves up, pushes hydraulic oil to enter damping mouth (16) by filter plate (17) and flow into clearance hole (15), when clearance hole (15)
When hydraulic oil reaches setup pressure value, (13) cutting is cut off, and hydraulic oil enters delay chamber (12) start-up study mechanism (3), passes through
Duration is set, when chamber (12) hydraulic oil that is delayed reaches setup pressure value, shear pin (11) is opened and cuts, push and open piston (8)
On move up into and open air chamber (7), until pressure break collar extension (10) communicate with pressure break internal orifice (9).
9. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 8, it is characterised in that: the top connection (1)
It is connect respectively with shell (2) upper and lower side by threaded coaxial with lower contact (6), central tube (4) upper end and top connection (1) pass through spiral shell
Line is coaxially connected, and lower end and lower contact (6) co-axial seal cooperate.
10. a kind of piston type delayed start-up toe-end sliding sleeve according to claim 9, it is characterised in that: the sealing-plug
(22) closed at one end, other end perforation, perforation end is connected to pit shaft inner cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821811355.9U CN209261536U (en) | 2018-11-05 | 2018-11-05 | A kind of piston type delayed start-up toe-end sliding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821811355.9U CN209261536U (en) | 2018-11-05 | 2018-11-05 | A kind of piston type delayed start-up toe-end sliding sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN209261536U true CN209261536U (en) | 2019-08-16 |
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ID=67559690
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821811355.9U Active CN209261536U (en) | 2018-11-05 | 2018-11-05 | A kind of piston type delayed start-up toe-end sliding sleeve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296349A (en) * | 2018-11-05 | 2019-02-01 | 中国石油集团川庆钻探工程有限公司 | Piston type delayed start-up toe-end sliding sleeve |
| CN110513095A (en) * | 2019-09-23 | 2019-11-29 | 中国石油集团川庆钻探工程有限公司 | A kind of well fracturing reforming technology for opening toe-end sliding sleeve using controllable time delay |
| CN111691853A (en) * | 2020-07-08 | 2020-09-22 | 中国石油天然气集团有限公司 | High-pressure energy-storage time-delay opening type toe end sliding sleeve and using method thereof |
-
2018
- 2018-11-05 CN CN201821811355.9U patent/CN209261536U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296349A (en) * | 2018-11-05 | 2019-02-01 | 中国石油集团川庆钻探工程有限公司 | Piston type delayed start-up toe-end sliding sleeve |
| CN109296349B (en) * | 2018-11-05 | 2023-09-15 | 中国石油集团川庆钻探工程有限公司 | Piston type delay opening toe end sliding sleeve |
| CN110513095A (en) * | 2019-09-23 | 2019-11-29 | 中国石油集团川庆钻探工程有限公司 | A kind of well fracturing reforming technology for opening toe-end sliding sleeve using controllable time delay |
| CN111691853A (en) * | 2020-07-08 | 2020-09-22 | 中国石油天然气集团有限公司 | High-pressure energy-storage time-delay opening type toe end sliding sleeve and using method thereof |
| CN111691853B (en) * | 2020-07-08 | 2024-01-19 | 中国石油天然气集团有限公司 | High-pressure energy storage time-delay opening type toe end sliding sleeve and use method thereof |
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