CN107178335A - A kind of multi-functional setting ball seat and its application method - Google Patents
A kind of multi-functional setting ball seat and its application method Download PDFInfo
- Publication number
- CN107178335A CN107178335A CN201710534118.6A CN201710534118A CN107178335A CN 107178335 A CN107178335 A CN 107178335A CN 201710534118 A CN201710534118 A CN 201710534118A CN 107178335 A CN107178335 A CN 107178335A
- Authority
- CN
- China
- Prior art keywords
- seat
- ball seat
- lower contact
- setting ball
- top connection
- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a kind of multi-functional setting ball seat and its application method, including top connection, lower contact, and it is arranged on setting ball seat and ball-and-seat in top connection and lower contact, balance pipe is provided with top connection, feed liquor throttling passage is provided with lower contact, the opening and closing that slide switch is used to control feed liquor throttling passage is provided with lower contact, the bottom of lower contact is provided with pressure guide hole, top connection is connected through a screw thread with lower contact, is arranged on the CO using permanent packer2Driving injection string bottom is used to realize downhole closing operation.The present invention can realize in going down process oily casing pressure balanced, drilling tool in place after, can set packer, downhole closing can be realized during trip-out again.
Description
Technical field
The invention belongs to the drilling completion technical field in oil, the construction of natural gas fields, and in particular to one kind is applied to CO2Drive
The multi-functional setting ball seat and its application method of injection string.
Background technology
In CO2Drive injection string be frequently necessary to tubing string in going down process can oily casing pressure balanced, under tubing string in place after, tool
There is set packer function, there is feed pathway during injection, being capable of downhole closing when stopping note, it is therefore desirable to while using setting ball seat
With ball-and-seat, but conventional setting ball seat and ball-and-seat tool combinations can cause function above can not be while realizing：First, sit
Need to destroy setting ball seat after sealed packer, but this will have influence on the normal work of bottom ball-and-seat；2nd, ball-and-seat will cause
Casing pressure is higher than oil pressure in going down process, and tubing string is swum in wellbore fluid, it is difficult to tripping in；3rd, the reliability of single-stage ball-and-seat has
Treat in lifting.
Therefore in order to be integrated together function above, it is necessary to redesign a kind of multi-functional setting ball seat.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of multi-functional seat
Blocking seat and its application method, installed in the CO using permanent packer2Injection string bottom is driven, makes tubing string in going down process
Can oily casing pressure balanced, beneficial to tubing string tripping in, under tubing string in place after, with set packer function, in injection process, passage
It is unobstructed；When stopping note, downhole closing can be realized.
The present invention uses following technical scheme：
A kind of multi-functional setting ball seat, including top connection, lower contact, and be arranged in the top connection and lower contact
It is provided with setting ball seat and ball-and-seat, the top connection in balance pipe, the lower contact and is provided with feed liquor throttling passage, under described
The opening and closing that slide switch is used to control the feed liquor throttling passage is provided with joint, the bottom of the lower contact is provided with pilot
Hole, the top connection is connected through a screw thread with lower contact, is arranged on the CO using permanent packer2Driving injection string bottom is used for
Realize downhole closing operation.
Further, the setting ball seat is arranged in the top connection, the ball-and-seat be arranged on the top connection with
Between lower contact.
Further, the setting ball seat is fixed in the top connection by shear pin.
Further, it is provided with sealing ring between the setting ball seat and the top connection.
Further, baffle plate is provided between the ball-and-seat and lower contact, if being provided with dry hole on the baffle plate.
Further, the top of the lower contact is used to fix the baffle plate provided with step.
Further, the slide switch includes being arranged on the sliding sleeve in the middle part of the lower contact, and the sliding sleeve passes through inside and outside
Chock pressure difference, opens or closes the feed liquor throttling passage.
Further, it is provided with lower seal between the sliding sleeve and the lower contact.
Further, the ball-and-seat includes valve seat and valve ball, and the valve ball is arranged in the valve seat.
A kind of application method of multi-functional setting ball seat, comprises the following steps：
Oil pipe is connected with sleeve pipe by balance pipe in S1, going down process, oily casing pressure balanced, complete lower bore；
Under S2, tubing string in place after, throw solvable ball and be seated on setting ball seat, build the pressure set packer, continue to boost and cut
Shear pin, moves down setting ball seat, closes balance pipe；
Liquid enters from feed liquor throttling passage when S3, trip-out, promotes valve ball to seal up valve seat, realizes that the first order is close in oil pipe
Envelope, if seal failure, in the presence of chock pressure difference, liquid promotes sliding sleeve to move up through pressure guide hole, closes feed liquor throttling passage,
Realize secondary seal.
Compared with prior art, the present invention at least has the advantages that：
The multi-functional setting ball seat of the present invention includes top connection, lower contact, and the seat being arranged in top connection and lower contact
Blocking seat and ball-and-seat, top can be achieved to throw solvable ball set packer, while bottom is integrated with two-stage equivalent to setting ball seat
Ball-and-seat, when stopping injection, when casing pressure is higher than oil pressure, promotes sliding sleeve to move up closing feed liquor throttling passage by chock pressure difference,
If this level fails, altered in liquid continuation, valve ball will be promoted to block valve seat, coordinated with permanent packer, realize that underground is closed
Well, can now carry out the operation such as pull out of hole, it is adaptable to CO2Injection string, installed in CO2Injection string bottom is driven, makes tubing string under
During brill can oily casing pressure balanced, under tubing string in place after, with set packer function, while should also have downhole closing work(
Can, as a result of twin-stage single current valve arrangement, make downhole closing relatively reliable.
Further, by setting perforated baffle to have two benefits, one is that can keep off valve ball with lattice, prevents valve in going down process
Ball drops, and two be that can reduce flow resistance by perforate.
Further, balance pipe is designed, and is realized oil jacket UNICOM during lower bore, is solved under being caused due to increase ball-and-seat
Tubing string floating is in a liquid during brill, it is difficult to the problem of tripping in.
Further, setting ball seat structure optimization, and coordinate solvable ball, realize that throwing solvable ball under tubing string afterwards in place sets envelope
Every device, continue to boost afterwards to cut pin, setting ball seat moves down closing balance pipe, while solvable ball is all molten in design time
It has been solved that, solve the problem of ball-and-seat and setting ball seat are interfered with each other, it is ensured that tubing string it is unobstructed.
Further, twin-stage ball-and-seat is designed, the reliability of downhole closing is improved, second is controlled by feed liquor throttling passage
The opening and closing of level ball-and-seat.
Further, by setting sliding sleeve to control feed liquor throttling passage to have two benefits, liquid titanium dioxide when being positive injection
Carbon can be thence through stratum be entered, and two be that, when stopping note, if single current valve ball is set not sternly, now formation fluid will be from feed liquor
Throttling passage enters oil pipe, while being limited by the aperture of feed liquor throttling passage, liquid is throttled, and produces the throttling between tubing and casing
Pressure difference, closing feed liquor throttling passage will be moved up in the promotion low sleeve of chock pressure difference.Because being equipped with sealing ring, Neng Goubao on sliding sleeve
Demonstrate,prove reliable sealing effectiveness.
Further, the benefit for setting balance pipe is exactly the contradiction for solving setting ball seat Yu singly staying valve group to be produced when closing,
If i.e. without balance pipe, because ball-and-seat is closed during lower brill, causing to be full of air in oil pipe, oil pipe is swum in liquid
In, lower brill difficulty is larger.By setting balance pipe fluid to enter oil pipe from balance pipe, the buoyancy of oil pipe is reduced, is easy to oil
Pipe tripping in.
The invention also discloses a kind of method of multi-functional setting ball seat, oil pipe and sleeve pipe are passed through into balance in going down process
Hole is connected, oily casing pressure balanced, complete it is lower bore, under tubing string in place after, throw solvable ball and be seated on setting ball seat, build the pressure and set packing
Device, continues to boost and cuts shear pin, move down setting ball seat, close balance pipe, liquid enters from feed liquor throttling passage during trip-out
Enter, promote valve ball to seal up valve seat, realize that the first order is sealed in oil pipe, if seal failure, in the presence of chock pressure difference, liquid
Body promotes sliding sleeve to move up through pressure guide hole, closes feed liquor throttling passage, realizes secondary seal.The multi-functional setting ball seat passes through balance
Hole and the design and Mechanism Optimization of sliding sleeve feed liquor throttling passage, coordinate solvable playing skill art, and realize setting ball seat and ball-and-seat
Organic assembling, meet CO2Drive requirement of boring, inject, stop noting and pull out of hole under tubing string safety.
In summary, the present invention can realize in going down process oily casing pressure balanced, drilling tool in place after, can set packer,
Downhole closing can be realized during trip-out again.
Below by drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is the structural representation of multi-functional setting ball seat of the invention.
Wherein：1. top connection；2. setting ball seat；3. on sealing ring；4. shear pin；5. balance pipe；6. valve seat；7. valve
Ball；8. baffle plate；9. hole；10. feed liquor throttling passage；11. sliding sleeve；12. lower seal；13. lower contact；14. pressure guide hole.
Embodiment
In the description of the invention, it is to be understood that term " " center ", " on ", " under ", " top ", " bottom ", " interior ",
The orientation or position relationship of instructions such as " outer " are, based on orientation shown in the drawings or position relationship, to be for only for ease of and describe this hair
Bright and simplified description, rather than instruction or the signified device of hint or element must be with specific orientation, with specific orientation
Construction and operation, therefore be not considered as limiting the invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
The invention provides a kind of multi-functional setting ball seat, designed for installed in the CO using permanent packer2Drive note
Enter tubing string bottom, top can be achieved to throw solvable ball set packer, while bottom is integrated with two-stage single current equivalent to setting ball seat
Valve, when stopping injection, when casing pressure is higher than oil pressure, promotes sliding sleeve to move up closing feed liquor throttling passage by chock pressure difference, if
This level is failed, and is altered in liquid continuation, and valve ball will be promoted to block valve seat, coordinate with permanent packer, realize downhole closing, this
When can carry out the operation such as pull out of hole.
Referring to Fig. 1, multi-functional setting ball seat of the invention, including top connection 1, lower contact 13, setting ball seat 2 and single current
Valve, top connection 1 is connected through a screw thread with lower contact 13, and setting ball seat 2 is arranged in top connection 1, on the side outer wall of top connection 1
Balance pipe 5 is provided with, ball-and-seat is arranged between the top connection 1 and lower contact 13, and feed liquor throttling passage is provided with lower contact 13
10 as injection channel, and the opening and closing that slide switch is used to control feed liquor throttling passage 10, lower contact are provided with lower contact 13
13 bottom is provided with pressure guide hole 14.
Slide switch includes the sliding sleeve 11 for being arranged on the middle part of lower contact 13, sliding sleeve 11 by inside and outside chock pressure difference, open or
Feed liquor throttling passage 10 is closed, lower seal 12 is provided between sliding sleeve 11 and lower contact 13.
Baffle plate 8 is provided between ball-and-seat and lower contact 13, if being provided with dry hole 9 on baffle plate 8, the top of lower contact 13 is provided with
Step is used to fix the baffle plate 8.
Setting ball seat 2 is fixed in top connection 1 by shear pin 4, is provided between setting ball seat 2 and top connection 1
Sealing ring 3.
The top of multi-functional setting ball seat is used to realize setting ball seat function, and the bottom of multi-functional setting ball seat is used to realize
Ball-and-seat function, can be achieved bottom-hole shut-in.
Ball-and-seat includes valve seat 6 and valve ball 7, and the valve ball 7 is arranged in the valve seat 6.
Embodiment is as follows：
Oil pipe is connected with sleeve pipe by balance pipe 5 in going down process, oily casing pressure balanced, lower safely can be bored；
Under tubing string in place after, throw solvable ball and be seated on setting ball seat 2, build the pressure set packer, the cutting that continues to boost is cut
Pin 4 is cut, setting ball seat 2 is moved down, balance pipe 5 is closed；
Liquid enters from feed liquor throttling passage 10 during trip-out, promotes valve ball 7 to seal up valve seat 6, realizes the first order in oil pipe
Sealing, if due to the level failure of the reasons such as fouling, in the presence of chock pressure difference, because casing pressure is higher than oil pressure, liquid is through leading
Pressure hole 14 promotes sliding sleeve 11 to move up, and closes feed liquor throttling passage 10, realizes secondary seal.
The technological thought of above content only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within claims of the present invention
Protection domain within.
Claims (10)
1. a kind of multi-functional setting ball seat, it is characterised in that including top connection (1), lower contact (13), and be arranged on described
Balance pipe (5) is provided with setting ball seat (2) and ball-and-seat in joint (1) and lower contact (13), the top connection (1), it is described
Feed liquor throttling passage (10) is provided with lower contact (13), slide switch is provided with the lower contact (13) described for controlling
The opening and closing of feed liquor throttling passage (10), the bottom of the lower contact (13) is provided with pressure guide hole (14), and the top connection (1) is with
Joint (13) is connected through a screw thread, and is arranged on the CO using permanent packer(2)Driving injection string bottom is used to realize downhole closing
Operation.
2. a kind of multi-functional setting ball seat according to claim 1, it is characterised in that the setting ball seat (2) is arranged on
In the top connection (1), the ball-and-seat is arranged between the top connection (1) and lower contact (13).
3. a kind of multi-functional setting ball seat according to claim 2, it is characterised in that the setting ball seat (2) is by cutting
Pin (4) is cut to be fixed in the top connection (1).
4. a kind of multi-functional setting ball seat according to claim 3, it is characterised in that the setting ball seat (2) with it is described
Sealing ring (3) is provided between top connection (1).
5. a kind of multi-functional setting ball seat according to claim 2, it is characterised in that the ball-and-seat and lower contact (13)
Between be provided with baffle plate (8), the baffle plate (8) if on be provided with dry hole (9).
6. a kind of multi-functional setting ball seat according to claim 5, it is characterised in that the top of the lower contact (13) is set
There is step to be used to fix the baffle plate (8).
7. a kind of multi-functional setting ball seat according to claim 1, it is characterised in that the slide switch includes being arranged on
Sliding sleeve (11) in the middle part of the lower contact (13), the sliding sleeve (11) opens or closes the feed liquor by inside and outside chock pressure difference
Throttling passage (10).
8. a kind of multi-functional setting ball seat according to claim 7, it is characterised in that the sliding sleeve (11) with it is described under connect
Lower seal (12) is provided between head (13).
9. a kind of multi-functional setting ball seat according to claim 1, it is characterised in that the ball-and-seat includes valve seat (6)
With valve ball (7), the valve ball (7) is arranged in the valve seat (6).
10. a kind of application method of multi-functional setting ball seat as claimed in claim 1, it is characterised in that comprise the following steps：
Oil pipe is connected with sleeve pipe by balance pipe in S1, going down process, oily casing pressure balanced, complete lower bore；
Under S2, tubing string in place after, throw solvable ball and be seated on setting ball seat, build the pressure set packer, continue to boost and cut shearing
Pin, moves down setting ball seat, closes balance pipe；
Liquid enters from feed liquor throttling passage when S3, trip-out, promotes valve ball to seal up valve seat, realizes that the first order is sealed in oil pipe,
If seal failure, in the presence of chock pressure difference, liquid promotes sliding sleeve to move up through pressure guide hole, closes feed liquor throttling passage, real
Existing secondary seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534118.6A CN107178335B (en) | 2017-07-03 | 2017-07-03 | Multifunctional setting ball seat and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534118.6A CN107178335B (en) | 2017-07-03 | 2017-07-03 | Multifunctional setting ball seat and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107178335A true CN107178335A (en) | 2017-09-19 |
| CN107178335B CN107178335B (en) | 2019-12-06 |
Family
ID=59845950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710534118.6A Active CN107178335B (en) | 2017-07-03 | 2017-07-03 | Multifunctional setting ball seat and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107178335B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108457620A (en) * | 2018-03-16 | 2018-08-28 | 江苏航天鸿鹏数控机械有限公司 | Pass through the electro-hydraulic driving back-pressure valve and its control method of remote control |
| CN108533216A (en) * | 2018-05-23 | 2018-09-14 | 中国石油集团渤海钻探工程有限公司 | Liquid switch valve is returned in a kind of anti-tubing string |
| CN110847875A (en) * | 2019-11-19 | 2020-02-28 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Short-time throttling pipe column and short-time throttling method |
| CN111878036A (en) * | 2020-08-05 | 2020-11-03 | 中石化石油工程技术服务有限公司 | Multifunctional fluid one-way injection device and use method thereof |
| CN112922564A (en) * | 2021-02-04 | 2021-06-08 | 西安石油大学 | Underground throttling device based on special degradable alloy ball conical plug adjustment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536183A (en) * | 2012-01-31 | 2012-07-04 | 中国石油化工股份有限公司 | Underground gas injection pipe column |
| CN203308443U (en) * | 2013-05-24 | 2013-11-27 | 中国石油化工股份有限公司 | Circulating gas injection pipe column |
| WO2016139315A1 (en) * | 2015-03-04 | 2016-09-09 | Fmc Kongsberg Subsea As | Method and valve assembly for flushing of debris |
| CN206144523U (en) * | 2016-11-04 | 2017-05-03 | 天津汇铸石油设备科技有限公司 | Two overhead paddle check valves |
-
2017
- 2017-07-03 CN CN201710534118.6A patent/CN107178335B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536183A (en) * | 2012-01-31 | 2012-07-04 | 中国石油化工股份有限公司 | Underground gas injection pipe column |
| CN203308443U (en) * | 2013-05-24 | 2013-11-27 | 中国石油化工股份有限公司 | Circulating gas injection pipe column |
| WO2016139315A1 (en) * | 2015-03-04 | 2016-09-09 | Fmc Kongsberg Subsea As | Method and valve assembly for flushing of debris |
| CN206144523U (en) * | 2016-11-04 | 2017-05-03 | 天津汇铸石油设备科技有限公司 | Two overhead paddle check valves |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108457620A (en) * | 2018-03-16 | 2018-08-28 | 江苏航天鸿鹏数控机械有限公司 | Pass through the electro-hydraulic driving back-pressure valve and its control method of remote control |
| CN108533216A (en) * | 2018-05-23 | 2018-09-14 | 中国石油集团渤海钻探工程有限公司 | Liquid switch valve is returned in a kind of anti-tubing string |
| CN110847875A (en) * | 2019-11-19 | 2020-02-28 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Short-time throttling pipe column and short-time throttling method |
| CN110847875B (en) * | 2019-11-19 | 2023-12-05 | 中国石油天然气集团有限公司 | Short-time throttling pipe column and short-time throttling method |
| CN111878036A (en) * | 2020-08-05 | 2020-11-03 | 中石化石油工程技术服务有限公司 | Multifunctional fluid one-way injection device and use method thereof |
| CN112922564A (en) * | 2021-02-04 | 2021-06-08 | 西安石油大学 | Underground throttling device based on special degradable alloy ball conical plug adjustment |
| CN112922564B (en) * | 2021-02-04 | 2023-06-30 | 西安石油大学 | Underground throttling device based on special degradable alloy ball taper plug adjustment |
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| Publication number | Publication date |
|---|---|
| CN107178335B (en) | 2019-12-06 |
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