CN105972250A - Slurry equivalent density control valve - Google Patents
Slurry equivalent density control valve Download PDFInfo
- Publication number
- CN105972250A CN105972250A CN201610521935.3A CN201610521935A CN105972250A CN 105972250 A CN105972250 A CN 105972250A CN 201610521935 A CN201610521935 A CN 201610521935A CN 105972250 A CN105972250 A CN 105972250A
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- minute
- suppress
- pressure valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a slurry equivalent density control valve. The body of the slurry equivalent density control valve comprises a strong-pressure valve body, a strong-pressure valve sleeve, a strong-pressure valve sleeve jackscrew, a strong-pressure valve seat, a strong-pressure valve cover, a strong-pressure valve cover sealing cover, a strong-pressure valve cover sealing sleeve, a strong-pressure valve core, a strong-pressure valve rod, a strong-pressure bearing, a micro-pressure valve body, a micro-pressure valve sleeve jackscrew, a micro-pressure valve sleeve, a micro-pressure valve seat, a micro-pressure valve cover, a micro-pressure valve cover sealing cover, a micro-pressure valve cover sealing sleeve, a micro-pressure valve rod, a micro-pressure bearing and a micro-pressure valve core. By special structural design, the slurry equivalent density control valve disclosed by the invention is capable of realizing stepped control on strong pressure and micro pressure in order to realize precise control on equivalent density of the slurry, so the regulation on the slurry equivalent density can be effectively improved and the well bottom pressure can be controlled. The slurry equivalent density control valve disclosed by the invention is simple in structure, is convenient to operate and maintain and is an effective tool for quickly regulating the equivalent density of the slurry.
Description
Technical field
The present invention relates to a kind of valve, especially a kind of mud equal yield density control valve.
Background technology
Probing during, mud be realize bottom pressure control important medium, its have cutting carring,
Cool down drill bit, equilibrium strata pressure and prevent the functions such as cave-in.Mud enters drilling rod by faucet
In, flow out from bit port, return to ground by the annular space between drilling rod and the borehole wall.Mud in drilling process
The design of density size, does not require nothing more than and can maintain wellbore stability, prevent the borehole wall extension fracture (leakage) and
Shearing is collapsed (well slough), and borehole pressure to be able to maintain that balances, it is to avoid in a large amount of access wall of formation fluid,
Cause formation fluid to the pollution of mud and the engineering accident such as leakage, blowout, differential sticking.
Bottom pressure in drilling process generally has three kinds of states: overbalance, nearly balance and underbalance.Cross flat
Weighing apparatus drilling well, the determination of mud density is usually on the basis of the formation pore pressure gradient that barefoot interval is the highest,
Bottom pressure is consistently greater than strata pressure.Near-balance drilling technology, for overbalance, bottom pressure
Slightly larger than strata pressure, it is considered to swabbing pressure during trip-out, bottom pressure may be less than formation pore pressure,
But conceptive at near-balance drilling, bottom hole pressure difference should be always positive differential pressure.Under balance pressure drilling refers to mineshaft annulus
The bottom pressure of middle circulatory mediator is less than formation pore pressure, it is allowed to formation fluid controlledly enters pit shaft also
It is recycled to the drilling technology that ground is effectively treated.
When drilling deep layer bad ground, owing to the window between pore pressure and fracture pressure is smaller,
The drilling problems such as well kick, leakage, poisonous gas leakage, bit freezing, trip time be long often occur, no
But prolongation drilling period, but also the problem bringing the aspect such as safety and environment.If it is right in drilling process
Down-hole pressure is implemented effectively to control, and can preferably solve these challenges, and controlled pressure drilling technology is to alleviate
The effective ways of above-mentioned complex situations.
Controlled pressure drilling technology is mainly by wellhead back pressure, fluid density, fluid rheology, annular space liquid level
With the Comprehensive Control of flow resistance, make the pressure of whole pit shaft maintain formation pore pressure and fracture pressure it
Between, be balanced or near-balance drilling, effectively control formation fluid and invade well, reduce well kick, leakage,
The multiple drilling complexity situation such as bit freezing.Controlled pressure drilling is mainly used in accurately controlling the annular pressure of whole well and cuts open
Face, it is therefore intended that determine bottom pressure scope, thus control annular pressure section.
The main method that controlled pressure drilling realizes is that to reach quickly to regulate mud equivalent close by controlling circulating pressure
Degree, and then realize the drilling technologies such as overbalance, nearly balance and underbalance, especially there is leakage, well kick etc.
Quickly regulate the equal yield density of mud during bottom pressure exception, be quick one of important method solving problem.
Especially during gas well drilling, if there is gas cut in well, the mud density in well is made to reduce,
Part mud in gas displacement well so that the mud equal yield density in well reduces, if processing not in time,
Bottom pressure can be caused to reduce, and then cause more gas to invade pit shaft, make to return out the mud of pit shaft simultaneously
Amount increases, and causes the dangerous situations such as overflow, well kick even blowout.The most quickly it is adjusted to suitable mud work as
Metric density is significant for processing the complicated dangerous situation in drilling process.
Although having the special manifold of controlled pressure drilling at present, but its structure being complicated, involves great expense, therefore controlling
The development aspect of bottom pressure technology defines restraining factors.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of mud equal yield density scientific and reasonable for structure and controls
Valve.
In order to solve above-mentioned technical problem, the present invention includes suppressing valve and micropressure valve,
Described valve of suppressing includes suppressing valve body, suppressing spool and suppress valve rod, described in suppress valve body in be formed
Mud sprue, suppressing earial drainage road and minute-pressure earial drainage road, described mud sprue is connected at the bottom of swivel control head
On seat, described in suppress earial drainage road and be connected on slurry tank, described in suppress spool and be arranged on mud sprue, strong
Intersection between pressure earial drainage road and minute-pressure earial drainage road logical closes with control between three runners, and this suppresses spool
Being additionally provided with a minute-pressure discharge orifice on outer wall, described minute-pressure discharge orifice can make when suppressing spool and closing
Connect between mud sprue and minute-pressure earial drainage road, described in suppress valve stem seal and be arranged on and suppress valve body, should
Suppress valve rod and be connected with suppressing spool, and this is suppressed valve rod and controls to drive to suppress spool also by high-pressure and hydraulic
Logical close；
Described micropressure valve includes minute-pressure valve body, minute-pressure spool and minute-pressure valve rod, is formed in described micropressure valve body
Mud branch flow passage and mud discharge runner, and described mud branch flow passage and described minute-pressure are let out flow passage and arranged, institute
Stating mud discharge runner to be connected on slurry tank, described minute-pressure spool is in mud branch flow passage and mud discharges stream
Logical closing with control between two runners between road, described micropressure valve rod seal is arranged on minute-pressure valve body, should
Minute-pressure valve rod is connected with minute-pressure spool, and this minute-pressure valve rod controls to drive minute-pressure spool also by low-pressure hydraulic
Logical close.
Described valve of suppressing also includes suppressing valve pocket, suppresses valve pocket jackscrew, suppresses valve seat, suppresses valve gap, suppresses
Valve bonnet seal lid, suppress valve bonnet seal set and suppress bearing, described in suppress valve pocket, suppress valve pocket jackscrew and strong
Pressure valve seat is arranged in mud sprue, described in suppress valve seat and be oppositely arranged with described spool of suppressing, described by force
Pressure valve is set on to be suppressed valve pocket jackscrew and suppresses between valve seat；Described valve gap of suppressing is arranged on and suppresses on valve body,
Described valve bonnet seal set of suppressing is sleeved on and suppresses on valve rod, and this is suppressed valve bonnet seal set and suppresses between valve gap
Suppress bearing described in being additionally provided with, described in suppress bearing pass through described in suppress valve bonnet seal lid and suppressed valve by press seal
In lid.
Described micropressure valve also includes minute-pressure valve pocket jackscrew, minute-pressure valve pocket, minute-pressure valve seat, minute-pressure valve gap, minute-pressure
Valve bonnet seal lid, minute-pressure valve gap sealing shroud and minute-pressure bearing, described minute-pressure valve pocket jackscrew, minute-pressure valve pocket and micro-
Pressure valve seat is arranged in mud branch flow passage, and described minute-pressure valve seat is oppositely arranged with described minute-pressure spool, described micro-
Pressure valve is set between minute-pressure valve pocket jackscrew and minute-pressure valve seat；Described minute-pressure valve gap is arranged on minute-pressure valve body,
Described minute-pressure valve gap sealing shroud is sleeved on minute-pressure valve rod, and between this minute-pressure valve gap sealing shroud and minute-pressure valve gap
Be additionally provided with described minute-pressure bearing, described minute-pressure bearing by described minute-pressure valve bonnet seal lid by press seal at micropressure valve
In lid.
The invention has the beneficial effects as follows: suppressed and minute-pressure by minute-pressure earial drainage and achieving by the way of suppressing earial drainage
Grading control, reached the accurate control of mud equal yield density.In addition present configuration is simple, just with behaviour
Make and safeguard.The regulation to mud equal yield density can be effectively improved, it is achieved to shaft bottom by the use of the present invention
Pressure controlled quick regulation, is to process strata pressure and gas cut, the water enchroachment (invasion)s etc. such as leakage, well kick, well slough
The powerful during complex situations caused, for the behaviour that the process offer of the down hole problem in probing is strong
Support.
Accompanying drawing explanation
Fig. 1 is the structural representation of mud equal yield density control valve of the present invention；
Fig. 2 is the A-A profile in Fig. 1；
Fig. 3 is the B close-up schematic view in Fig. 2.
Detailed description of the invention
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings:
Seeing Fig. 1 to Fig. 3, the mud equal yield density control valve of the present invention includes suppressing valve and micropressure valve.Mud
Equal yield density control valve, including suppressing valve body 1, suppresses valve pocket 3, suppresses valve pocket jackscrew 2, suppress valve seat 4,
Suppress valve gap 5, suppress valve bonnet seal lid 6, suppress valve bonnet seal set 7, suppress spool 8, suppress valve rod 9,
Suppress bearing 10, minute-pressure valve body 11, minute-pressure valve pocket jackscrew 12, minute-pressure valve pocket 13, minute-pressure valve seat 14, micro-
Pressure valve lid 15, minute-pressure valve bonnet seal lid 16, minute-pressure valve gap sealing shroud 17, minute-pressure valve rod 18, minute-pressure bearing
19, minute-pressure spool 20.
Mud equal yield density control valve, mainly by suppressing valve and micropressure valve forms, is suppressed valve and micropressure valve is sealed even
Connecing, micropressure valve is in the side, minute-pressure earial drainage road 22 suppressing valve.
Suppressing spool 8 and have minute-pressure discharge orifice 23, minute-pressure discharge orifice 23, in side, minute-pressure earial drainage road 22, makes mud
Slurry flows into minute-pressure earial drainage road 22 through minute-pressure discharge orifice 23 in due course.
Suppress valve rod 9 and minute-pressure valve rod 18 uses different hydraulic controls respectively, suppress valve rod 9 and use high pressure
Hydraulic control, minute-pressure valve rod 18 uses low-pressure hydraulic control.
Suppress spool 8 and suppress valve rod 9 and connect, using hydraulic control to suppress valve rod 9 and drive and suppress spool 8,
And then control suppress spool 8 and the aperture suppressed between valve seat 4, the most then can control mud sprue and
That suppresses between earial drainage road, minute-pressure earial drainage road logical closes, and i.e. suppresses spool 8 in a closed condition, mud master
Runner, suppress and between earial drainage road, minute-pressure earial drainage road three, do not connect (mud sprue and minute-pressure earial drainage road mutually
Between connected by only minute-pressure discharge orifice 23), suppress spool 8 in the open state, mud sprue,
Suppress and be interconnected between earial drainage road, minute-pressure earial drainage road three.
Minute-pressure spool 20 and minute-pressure valve rod 18 connect, and use hydraulic control minute-pressure valve rod 18 to drive minute-pressure spool
20, and then control the aperture between minute-pressure spool 20 and minute-pressure valve seat 14.The most then can control mud to prop up
What runner and mud were discharged between runner logical closes, and i.e. minute-pressure spool 20 is in a closed condition, mud branch flow passage
With mud discharges between runner and do not connects, minute-pressure spool 20 in the open state, mud branch flow passage and mud
Discharge and connect between runner.
Suppressing valve for realizing stronger Stress control, micropressure valve is used for realizing less Stress control.Work as institute
When needing circulating pressure relatively low, mud, through mud sprue and the minute-pressure discharge orifice 23 suppressing spool 8, flows through
Minute-pressure earial drainage road 22 flows into micropressure valve.The control of less pressure is realized, when required circulating pressure by micropressure valve
Time higher, suppressing spool 8 and open, minute-pressure discharge orifice 23 is closed, and mud flows into and suppresses earial drainage road 21, thus
The regulation realizing annular space mesolow and high pressure controls.
Suppress valve and be connected to swivel control head base, suppress valve and swivel control head is tightly connected, suppress valve strong
Pressure earial drainage road 21 is connected to slurry tank, can close suppressing valve when required, make mud only pass through minute-pressure
Discharge orifice 23 flows into micropressure valve.
Micropressure valve one end is connected to suppress valve minute-pressure earial drainage road 22, and the other end is connected to slurry tank, when there is a need to
Time micropressure valve can be closed, make mud cannot pass through micropressure valve.
By suppressing the regulation of valve and micropressure valve, it is achieved the regulation of annular pressure, so reach regulate mud work as
The purpose of metric density, when needs mud crosses stream, the control pressure being suppressed valve and micropressure valve by regulation is adjusted
Joint suppresses spool 8 and the aperture of minute-pressure spool 20, enables mud to be flowed into by mud equal yield density control valve
Slurry tank.When need not mud and crossing stream, suppress the pressure of valve and micropressure valve by regulation and close and suppress valve
Core 8 and minute-pressure spool 20, make mud can not pass through mud equal yield density control valve.
The present invention realizes suppressing the grading control with minute-pressure by special structure design, to reach to work as mud
The accurate control of metric density, can effectively improve the regulation to mud equal yield density, it is achieved to bottom pressure
Control, mud equal yield density control valve simple in construction in addition, it is simple to operation and maintenance, be to realize to shaft bottom again
Miscellaneous situation fast reaction and the effective tool of process, have preferable economic benefit and social value.
In sum, present disclosure is not limited in the above embodiments, those skilled in the art
Other embodiment can be proposed within technological guidance's thought of the present invention, but these embodiments are included in
Within the scope of the present invention.
Claims (3)
1. a mud equal yield density control valve, it is characterised in that: include suppressing valve and micropressure valve,
Described valve of suppressing includes suppressing valve body (1), suppressing spool (8) and suppress valve rod (9), described in suppress
It is formed with mud sprue in valve body (1), suppresses earial drainage road (21) and minute-pressure earial drainage road (22), described
Mud sprue is connected on swivel control head base, described in suppress earial drainage road (21) and be connected on slurry tank,
Described spool (8) of suppressing is arranged on mud sprue, suppresses earial drainage road (21) and minute-pressure earial drainage road (22)
Between intersection logical close with control between three runners, this is suppressed, and to be additionally provided with one on spool (8) outer wall micro-
Pressure discharge orifice (23), described minute-pressure discharge orifice (23) can make when suppressing spool (8) and closing
Connect between mud sprue and minute-pressure earial drainage road (22), described in suppress valve rod (9) and be sealingly mounted at by force
Pressure valve body (1), this suppresses valve rod (9) and suppresses spool (8) and be connected, and this to suppress valve rod (9) the most logical
Cross the voltage-controlled system of high pressure liquid and drive logical the closing suppressing spool (8)；
Described micropressure valve includes minute-pressure valve body (11), minute-pressure spool (20) and minute-pressure valve rod (18), described
Being formed with mud branch flow passage in minute-pressure valve body (11) and mud discharges runner, described mud branch flow passage is with described
Minute-pressure earial drainage road (22) connection is arranged, and described mud is discharged runner and is connected on slurry tank, described micropressure valve
Core (20) is in mud branch flow passage and mud and discharges and logical close with control between two runners between runner, institute
State minute-pressure valve rod (18) to be sealingly mounted on minute-pressure valve body (11), this minute-pressure valve rod (18) and micropressure valve
Core (20) connects, and this minute-pressure valve rod (18) controls to drive minute-pressure spool (20) also by low-pressure hydraulic
Logical close.
2. according to the mud equal yield density control valve described in claim 1, it is characterised in that suppress valve described in:
Also include suppressing valve pocket (3), suppress valve pocket jackscrew (2), suppress valve seat (4), suppress valve gap (5), strong
Pressure valve bonnet seal lid (6), suppress valve bonnet seal set (7) and suppress bearing (10), described in suppress valve pocket (3),
Suppress valve pocket jackscrew (2) and suppress valve seat (4) and be arranged in mud sprue, described in suppress valve seat (4)
Be oppositely arranged with described spool (8) of suppressing, described in suppress valve pocket (3) and be arranged on and suppress valve pocket jackscrew (2)
And suppress between valve seat (4)；Described valve gap (5) of suppressing is arranged on and suppresses on valve body (1), described in suppress
Valve bonnet seal set (7) is sleeved on to be suppressed on valve rod (9), and this is suppressed valve bonnet seal set (7) and suppresses valve
Lid (5) between be additionally provided with described in suppress bearing (10), described in suppress bearing (10) pass through described in suppress valve
Lid seal lid (6) by press seal in suppressing valve gap (5).
3. according to the mud equal yield density control valve described in claim 1, it is characterised in that: described micropressure valve
Also include minute-pressure valve pocket jackscrew (12), minute-pressure valve pocket (13), minute-pressure valve seat (14), minute-pressure valve gap (15),
Minute-pressure valve bonnet seal lid (16), minute-pressure valve gap sealing shroud (17) and minute-pressure bearing (19), described micropressure valve
Set jackscrew (12), minute-pressure valve pocket (13) and minute-pressure valve seat (14) are arranged in mud branch flow passage, described micro-
Pressure valve seat (14) is oppositely arranged with described minute-pressure spool (20), and described minute-pressure valve pocket (13) is arranged on micro-
Between pressure valve set jackscrew (12) and minute-pressure valve seat (14)；Described minute-pressure valve gap (15) is arranged on micropressure valve
On body (11), described minute-pressure valve gap sealing shroud (17) is sleeved on minute-pressure valve rod (18), and this minute-pressure
Described minute-pressure bearing (19), described minute-pressure it is additionally provided with between valve bonnet seal set (17) and minute-pressure valve gap (15)
Bearing (19) by described minute-pressure valve bonnet seal lid (16) by press seal in minute-pressure valve gap (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610521935.3A CN105972250B (en) | 2016-07-04 | 2016-07-04 | Mud equal yield density control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610521935.3A CN105972250B (en) | 2016-07-04 | 2016-07-04 | Mud equal yield density control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105972250A true CN105972250A (en) | 2016-09-28 |
| CN105972250B CN105972250B (en) | 2018-03-13 |
Family
ID=56955260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610521935.3A Active CN105972250B (en) | 2016-07-04 | 2016-07-04 | Mud equal yield density control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105972250B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1174143A (en) * | 1966-09-09 | 1969-12-10 | Chirana Zd Y Zdravotnicke Tech | Improvements in or relating to Three-Way Valves |
| US6347644B1 (en) * | 2000-03-03 | 2002-02-19 | Chemical Engineering Corporation | Bypass valve for water treatment system |
| CN103148245A (en) * | 2013-03-12 | 2013-06-12 | 四川广汉阀门厂 | Multifunctional electric control pressure release device, as well as electric control system and electric control method thereof |
| CN203499990U (en) * | 2013-08-26 | 2014-03-26 | 中国石油化工集团公司 | High-pressure backflow pipe manifold pneumatic control valve for drilling |
| CN204457467U (en) * | 2015-02-13 | 2015-07-08 | 中国石油集团渤海钻探工程有限公司 | The cavate continuous cyclic drilling control manifold that gas-liquid is general |
-
2016
- 2016-07-04 CN CN201610521935.3A patent/CN105972250B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1174143A (en) * | 1966-09-09 | 1969-12-10 | Chirana Zd Y Zdravotnicke Tech | Improvements in or relating to Three-Way Valves |
| US6347644B1 (en) * | 2000-03-03 | 2002-02-19 | Chemical Engineering Corporation | Bypass valve for water treatment system |
| CN103148245A (en) * | 2013-03-12 | 2013-06-12 | 四川广汉阀门厂 | Multifunctional electric control pressure release device, as well as electric control system and electric control method thereof |
| CN203499990U (en) * | 2013-08-26 | 2014-03-26 | 中国石油化工集团公司 | High-pressure backflow pipe manifold pneumatic control valve for drilling |
| CN204457467U (en) * | 2015-02-13 | 2015-07-08 | 中国石油集团渤海钻探工程有限公司 | The cavate continuous cyclic drilling control manifold that gas-liquid is general |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105972250B (en) | 2018-03-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022105945A1 (en) | Method and system for managed pressure well cementing based on deep wellbore cement slurry system simulation | |
| CN111502545B (en) | Near-horizontal pressurized directional drilling equipment and method for complex broken stratum under coal mine | |
| CN102226382A (en) | Uninterrupted circulating pup joint for petroleum well drilling and continuous slurry circulation method | |
| CN110284847B (en) | Drilling fluid circulation system for reducing drilling tripping suction pressure | |
| US11739611B2 (en) | Single sleeve, multi-stage cementer | |
| CN105672927A (en) | Well-killing method after gas drilling blowout | |
| CN106368607A (en) | System and method for conducting well killing in deepwater dual gradient drilling | |
| CN105715220B (en) | A kind of drilling well control pressure system | |
| GB2566403A (en) | Systems and methods for managing fluid pressure in a borehole during drilling operations | |
| US10472923B2 (en) | Trim for choke | |
| CN108999591A (en) | A kind of fracturing sliding bush | |
| CN104234648A (en) | Underground real-time control system for density of drilling fluid | |
| US8863823B1 (en) | Universal underground hydro-slotting perforation system controlled by working fluid pressure for activation and intensification of gas, oil, and hydro-geological wells | |
| CN202850930U (en) | Overflow automatic control device for drilling | |
| CN105972250A (en) | Slurry equivalent density control valve | |
| CN204492714U (en) | A kind of Novel control pressure well system | |
| AU2019202012A1 (en) | Drilling fluid density segmented regulation device | |
| CN102472088B (en) | Well completion method | |
| CN104895548A (en) | Seabed wellhead pressure indicating and automatic adjusting device for deepwater dual-gradient well drilling | |
| CN204024536U (en) | Continuous cyclic drilling diverter | |
| CN203961939U (en) | A kind of erosion resistant switching regulator fracturing sliding bush | |
| CN208073428U (en) | A kind of setting ball seat with secondary opening function | |
| CN205479525U (en) | Check valve in pit | |
| He et al. | How to improve sweep efficiency of horizontal wells for offshore fluvial oil reservoir by ICD inflow control device | |
| CN106949264A (en) | A kind of underground check-valves |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210907 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Huanghai Road 106 Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
|
| TR01 | Transfer of patent right |