CN110242259A - The long well section segmented gravel filling tubing string and its process of horizontal well - Google Patents
The long well section segmented gravel filling tubing string and its process of horizontal well Download PDFInfo
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- CN110242259A CN110242259A CN201910550424.8A CN201910550424A CN110242259A CN 110242259 A CN110242259 A CN 110242259A CN 201910550424 A CN201910550424 A CN 201910550424A CN 110242259 A CN110242259 A CN 110242259A
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- screen casing
- string
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims description 15
- 238000005406 washing Methods 0.000 claims abstract description 59
- 239000002002 slurry Substances 0.000 claims abstract description 32
- 238000012856 packing Methods 0.000 claims abstract description 22
- 230000011218 segmentation Effects 0.000 claims abstract description 17
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 230000033228 biological regulation Effects 0.000 claims abstract description 11
- 239000004570 mortar (masonry) Substances 0.000 claims description 49
- 238000007789 sealing Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 239000003129 oil well Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000010985 leather Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of long well section of horizontal well segmentation gravel filling tubing string and its techniques, including interior tubing string and outer tubing string, said inner tube column includes the rod string being successively spirally connected from left to right, by-pass means, upper washing pipe, middle washing pipe and lower washing pipe, the middle washing pipe front end and rear end pass through filling valve system and upper washing pipe respectively, lower washing pipe connection, the filling valve system includes outer sleeve and unlatching spool, be spirally connected outer sleeve between upper washing pipe and middle washing pipe and lower washing pipe, the outer sleeve radial symmetric is equipped with pack hole, pack hole constitutes slurry placement channel by opening spool regulation；The outer tubing string includes the drill sleeve string being successively spirally connected from left to right, suspension arrangement, upper screen casing, upper seal bore, middle screen casing, lower seal cylinder and lower screen casing, and said inner tube column is placed in outer tubing string inner cavity, and affixed in one by reverse thread.The utility model has the advantages that the present invention makes full use of filling valve system regulation up and down, segmentation gravel packing operations are realized.
Description
Technical field
The invention belongs to technical field of petroleum extraction more particularly to a kind of long well section segmented gravel filling pipes of horizontal well
Column and its process.
Background technique
In horizontal well long well section gravel-packing process, the height of gravel packing effectiveness is for the sand control service life of oil well and oil
Well production life of well plays a crucial role.Currently, being more than 300 meters of gravel filling mainly using cage for horizontal section length
The sand control completion mode of system filling.This kind of filling method is difficult to fill gravel packing zone closely knit, and can not achieve long well section has
Effect filling and effective sand control.First is that using restraining liner sand control, which adds current solution in advance outside screen casing
Work installs pack gravel layer, then the G.I.H together with screen casing.Gravel tripping in together with screen casing be hampered risk is big, cost compared with
Height can not will be fully populated between screen casing and the borehole wall；Scheme second is that by the way of generally filling, this placement method for compared with
Long horizontal segment cannot achieve high efficiency filling, and leakiness is filled between screen casing and the borehole wall, is caused simultaneously because horizontal segment is too long
Gravel shifts to an earlier date deposition blocking, eventually leads to sand control failure.
Patent document publication number discloses the pressure-control valve in a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL tubing string, the filling tubing string
Including oil pipe, bleeder, washing pipe, gravel pack tools, tubing string of cementing the well includes casing and screen casing, and casing is located at vertical well section, sieve
Pipe be located at net horizontal section, oil pipe (3), bleeder (2), oil pipe (3), pressure-control valve (4), washing pipe (6), pressure-control valve (4),
Washing pipe (6), gravel pack tools (7) are from top to bottom sequentially connected；Pressure-control valve (4) is mounted on oil pipe (3) and gravel fills
Between tool (7)；2 or 2 or more pressure-control valves (4) are located in the screen casing (5) of net horizontal section；The pressure-control valve
It include: top connection, base tube, lower contact, top connection and lower contact are respectively and fixedly installed to the upper/lower terminal of base tube, it is characterized in that:
It is from top to bottom screw thread (18), spline (19), convex platform (20), lower convex platform (21), convex platform in the middle part of base tube (12) outer circle
(20) there is a Duan Guanti between lower convex platform (21), the length of tube body is greater than the length of leather cup (15)；On the convex platform (20)
Base tube (12) outer circle of side is sequentially arranged with leather cup (15), spring (14), pre-load nut (13)；The bowl of leather cup (15)
Mouth down, bottom of bowl are stuck in the top of convex platform (20), and leather cup (15) is slided along spline (19), expose base tube (12) upper spline (19)
Slot become backwater channel；Pre-load nut (13) is fixedly connected with the screw thread (18) of base tube (12)；It is convex under the base tube (12)
Centralizer (16) are fixedly installed with below platform (21).Above-mentioned patented technology is suitable for horizontal well, high angle hole gravel packing screen
Complete well construction operation, it is not in place in order to overcome the filling of existing level well gravel discontented or fill, lead to the development effectiveness of horizontal well
The deficiency of difference.But this technology is primarily present following deficiency: 1, the technique uses general filling method, can not be long to horizontal well
Well section carries out segmentation gravel pack service, and gravel packing effectiveness is not high.2, density gravel filling in technique use, work progress
Easily blocking causes construction to fail.3, technology sand retention pipe top after construction by cementing operation, later period needs operation
Sand retention pipe is salvaged producing well by Shi Wufa.
A kind of pack effectiveness that can be improved the segmentation gravel filling of horizontal well long well section is urgently researched and developed in oil exploitation, is extended anti-
The gravel in sand validity period and oil mining service life fills tubing string and process.
Summary of the invention
It is an object of the invention to overcome the shortcomings of above-mentioned technology, and provide a kind of long well section segmented gravel of horizontal well
Tubing string and its process are filled, is filled using low-density gravel, avoids high density gravel that filling is caused to be lost because of gravitational settling
It loses, the upper and lower opening valve of design, realizes horizontal well long well section segmentation gravel packing operations, it is ensured that pack effectiveness.
The present invention to achieve the above object, using following technical scheme: a kind of long well section segmentation gravel filling of horizontal well
Tubing string, it is characterized in that: including interior tubing string and outer tubing string, said inner tube column includes the rod string being successively spirally connected from left to right, streams
Device, upper washing pipe, middle washing pipe and lower washing pipe, the middle washing pipe front end and rear end pass through respectively filling valve system and upper washing pipe, under
Washing pipe connection, the filling valve system include outer sleeve, open spool and positioning circular ring plate, be spirally connected between upper washing pipe and middle washing pipe
Be spirally connected outer sleeve between outer sleeve, middle washing pipe and lower washing pipe, and the outer sleeve radial symmetric is equipped with pack hole, and pack hole is by opening
It opens spool regulation and constitutes slurry placement channel, the by-pass means are equipped with inlet opening and liquid backflow hole；The outer tubing string includes certainly
Drill sleeve string, suspension arrangement, upper screen casing, upper seal bore, middle screen casing, lower seal cylinder and the lower screen casing that left-to-right is successively spirally connected, institute
It states interior tubing string to be placed in outer tubing string inner cavity, and affixed in one by reverse thread.
The housing tube rear end is bolted with positioning circular ring plate, and positioning circular ring plate, which is placed in, to be opened on rear side of spool, plays opening valve
The positioning action of core.
The upper seal that the upper seal bore of the outer tubing string passes through interior tubing string, which is constituted, goes up self sealing structure, close under outer tubing string
Sealed tube constitutes lower self sealing structure by the lower seal of interior tubing string.
The suspension arrangement of the outer tubing string is suspended on the tail portion of bunch tube by slips.
The lower screen casing lower end of the outer tubing string is bolted with guide head.
A kind of process of segmented gravel filling tubing string, carries out gravel filling using segmented gravel filling tubing string and makees
It when industry, is filled using low-density gravel, using the regulation of filling valve system, completes segmentation gravel packing operations, specific steps are such as
Under:
Step 1: interior tubing string and outer tubing string reverse thread are linked together on the ground, by the upper seal bore of outer tubing string
Cooperate with the upper seal of interior tubing string, self sealing structure in realization, by the lower sealing of lower seal cylinder and interior tubing string on outer tubing string
Circle cooperation realizes lower self sealing structure, is sent to predetermined position in well together with rod string；
Step 2: interior tubing string and outer tubing string reach in well behind predetermined position, lifting from the top and puting down tubing string hangs over suspension arrangement seat
On bunch tube, it is pumped into the mortar of the gravel containing low-density from rod string, the annular between screen casing and oil reservoir is entered by inlet opening
Space, and flow forward, when mortar reaches the right end of tubing string, mortar continues by lower screen casing, lower washing pipe into interior tubing string
It flows to the left, mortar is flowed out from liquid backflow hole, into the annular space between rod string and bunch tube, is finally returned to ground；Sand
The gravel of slurry is blocked in the outside of lower screen casing, is gradually accumulated to form retrofilling layer；Continue pump note mortar, when mortar pressure rise
To 10MPa, pushes unlatching spool to move right to positioning circular ring plate position, lower slurry placement channel is opened；
Gravel slurry containing low-density is pumped into rod string step 3: continuing through, mortar by inlet opening enter screen casing and
Annular space between oil reservoir, when mortar reaches lower slurry placement channel, screen casing enters inside screen casing and passes through in mortar process
Lower slurry placement channel enters interior tubing string and flows to the left, flows out from liquid backflow hole, empty into the annular between rod string and bunch tube
Between, it is finally returned to ground, the gravel in mortar is blocked in the outside of middle screen casing, and is gradually accumulated and to form middle filling layer；After
Continuous pump note mortar pushes unlatching spool to move right to positioning circular ring plate position, upper mortar is filled when pressure rise to 15MPa
Fill channel is opened；
Gravel slurry containing low-density is pumped into rod string step 4: continuing through, mortar by inlet opening enter screen casing and
Annular space between oil reservoir, when mortar reaches upper slurry placement channel, inside screen casing of the mortar by the entrance of upper screen casing simultaneously
Enter interior tubing string through upper slurry placement channel to flow to the left, be flowed out from liquid backflow hole, into the annular between rod string and bunch tube
Space is finally returned to ground, and the gravel in mortar is blocked in the outside of screen casing, and is gradually accumulated and to form filling layer；
Step 5: rotating forward upper lifting pipe post after rod string 20 encloses on ground, realizes operation of giving up, interior tubing string is risen
Oil well, construction terminate；After above-mentioned steps, realizes and gravel packing operations are segmented to horizontal well long well section.
The utility model has the advantages that compared with prior art, the present invention makes full use of filling valve system regulation up and down, segmentation gravel is realized
Packing job improves gravel packing effectiveness；It is filled using low-density gravel, high density gravel is avoided to cause to fill because of gravitational settling
It fills out unsuccessfully；Automatic interference seal is realized using upper and lower sealing ring 9, sealing effect is reliable, shortens the construction waiting time；Technique side
Method process is simple, only needed in work progress tripping in one-trip string can be realized set and (lift from the top and put down tubing string), sublevel fill stoping,
It gives up and waits operations, construction risk is small；Sand retention pipe is suspended on cannula end using suspension arrangement by the technique simultaneously, works as oil well production
Suspension arrangement and sand retention pipe can be played into producing well by fishing tool after sand control failure, provide preferable wellbore for the operation in later period
Environment.
Detailed description of the invention
Fig. 1 is interior tubing string schematic diagram；
Fig. 2 is outer tubing string schematic diagram；
Fig. 3 is lower section gravel packing operations and the schematic diagram for regulating and controlling retrofilling valve system；
Fig. 4 is the schematic diagram that valve system is filled in middle section gravel packing operations and regulation；
Fig. 5 is the schematic diagram for completing upper section gravel packing operations；(Figure of abstract)
Fig. 6 is to stay well construction schematic diagram；
Fig. 7 is the structural schematic diagram for filling valve system.
In figure: 1. rod strings, 2. bunch tubes, 3. suspension arrangements, 4. by-pass means, screen casing on 5., washing pipe on 6., 7. oil
Layer, 8. open spools, 9. upper seals, position circular ring plate on 10., screen casing in 11., washing pipe in 12., 13. outer sleeves, under 14.
Sealing ring, 15. lower positioning circular ring plates, 16. lower screen casings, 17. lower washing pipes, 18. guide heads, 19. inlet openings, 20. liquid backflow holes, 21.
Upper slurry placement channel, 21-1. pack hole, 22. upper seal bores, 23. lower slurry placement channels, 24. lower seal cylinders are filled under 25.
Packing course, filling layer in 26., filling layer on 27..
Specific embodiment
Below with reference to the preferred embodiment specific embodiment that the present invention will be described in detail.
It is detailed in attached drawing 1,2, the present invention has passed through a kind of long well section segmentation gravel filling tubing string of horizontal well, including interior tubing string
With outer tubing string, said inner tube column include the rod string 1 being successively spirally connected from left to right, by-pass means 4, upper washing pipe 6, middle washing pipe 12,
With lower washing pipe 17, the middle washing pipe front end and rear end pass through filling valve system respectively and connect with upper washing pipe 6, lower washing pipe 17, described
Filling valve system includes outer sleeve 13, opens spool 8 and positioning circular ring plate 10, and be spirally connected housing between upper washing pipe 6 and middle washing pipe 12
Be spirally connected outer sleeve between cylinder, middle washing pipe 12 and lower washing pipe 17, and the outer sleeve radial symmetric is equipped with pack hole 21-1, and pack hole is logical
It crosses the regulation of unlatching spool and constitutes upper slurry placement channel 21, the by-pass means are equipped with inlet opening 19 and liquid backflow hole 20；It is described
Outer tubing string include the drill sleeve string 2 being successively spirally connected from left to right, suspension arrangement 3, upper screen casing 5, upper seal bore 22, middle screen casing 11,
Lower seal cylinder 24 and lower screen casing 16, said inner tube column are placed in outer tubing string inner cavity, and affixed in one by reverse thread.
The housing tube rear end is bolted with upper and lower positioning circular ring plate 10,15 respectively, after positioning circular ring plate is placed in unlatching spool
The positioning action for opening spool is played in side.
The upper seal bore 22 of the outer tubing string constitutes upper self sealing structure by the upper seal 9 of interior tubing string, outer tubing string
Lower seal cylinder 24 constitutes lower self sealing structure by the lower seal 14 of interior tubing string.
The suspension arrangement of the outer tubing string is suspended on the tail portion of bunch tube by slips.
The lower screen casing lower end of the outer tubing string is bolted with guide head 18.
It is detailed in attached drawing 7, filling valve system includes outer sleeve 13, opens spool 8 and positioning circular ring plate 10, and upper washing pipe 6 is in
Be spirally connected between outer sleeve, middle washing pipe 12 and lower washing pipe 17 outer sleeve that is spirally connected between washing pipe 12, and the outer sleeve radial symmetric is equipped with
Pack hole, pack hole constitute slurry placement channel 21 by opening spool regulation.It opens spool external peripheral surface and is equipped with groove, it is recessed
Anchor ring height is lower than right side anchor ring height on the left of slot.When work, mortar enters unlatching spool by the pack hole of outer sleeve
Groove in, act on the anchor ring at left and right sides of groove, the area of the left side anchor ring of further groove is less than right side annulus
The hydraulic thrust power of the area in face, such left side is greater than right side, when pressure reaches 10MPa or 15MPa, pushes opening valve
Core moves right, and is positioned on positioning circular ring plate position, while regulating and controlling the perforation of slurry placement channel.
The structure of detailed description segmentation gravel filling tubing string
Be detailed in attached drawing 1, interior tubing string from left to right respectively by rod string, inlet opening, by-pass means, liquid backflow hole, upper washing pipe, on
Fill channel, outer sleeve, upper seal, positioning circular ring plate, middle washing pipe, retrofilling channel, outer sleeve, lower seal, setting circle
Ring plate, the combination of lower washing pipe are formed by connecting.
Wherein, rod string is screwed together by lower thread and by-pass means, is sent into process pipe string by rod string
Into well.
Wherein, inlet opening 19 and liquid backflow hole 20 are machined on by-pass means.By-pass means are two-layer pipe, have inner tube and
Outer tube is machined with the identical circular hole of diameter in inner and outer tubes, is mounted between two circular holes with an other round tube
(referred to as intermediate tube) plays the role of connecting internal tube space and outside pipe space.When work, liquid is from internal tube stream
Enter into intermediate tube, be flowed into outside pipe from intermediate tube, is then flowed between inner tube and outer tube from the lower end of two-layer pipe
Annular space, realize circulation.(wherein inner tube lower end closed)
Wherein, by-pass means 4 are linked together by screw thread with upper washing pipe 6.
Wherein, upper washing pipe 6 is threadedly coupled with the outer sleeve 13 of filling valve system.
Wherein, it fills and radially processes perforation round hole on the outer sleeve of valve system 8, constitute filling channel.
Wherein, upper seal 9 is threadedly coupled with the outer sleeve 13 of filling valve system.
Wherein, positioning circular ring plate is threadedly coupled with outer sleeve.
Wherein, middle washing pipe 12 is connected through a screw thread with outer sleeve 13.
Wherein, outer sleeve 13 is threadedly coupled with lower seal 14.
Wherein, lower positioning circular ring plate 15 is threadedly coupled with lower washing pipe 17.
Be detailed in attached drawing 2, outer tubing string from left to right respectively by drill sleeve string 2, suspension arrangement 3, upper screen casing 5, upper seal bore 22,
Middle screen casing 11, lower seal cylinder 24, lower screen casing 16, the combination of guide head 18 are formed by connecting.
Wherein, suspension arrangement 3 is suspended on the tail portion of bunch tube 2 by slips.
Wherein, suspension arrangement 3 is together by a threaded connection with upper screen casing 5.
Wherein, upper screen casing 5 is together by a threaded connection with upper seal bore 22.
Wherein, upper seal bore 22 is together by a threaded connection with middle screen casing 11.
Wherein, middle screen casing 11 is together by a threaded connection with lower seal cylinder 24.
Wherein, lower seal cylinder 24 is together by a threaded connection with lower screen casing 16.
Wherein, lower screen casing 16 is together by a threaded connection with guide head 18.
It is detailed in attached drawing 3-5, lower section gravel packing operations of the present invention and the opening lower part opening valve course of work
A kind of process of segmented gravel filling tubing string, carries out gravel filling using segmented gravel filling tubing string and makees
It when industry, is filled using low-density gravel, using the regulation of filling valve system, completes segmentation gravel packing operations, specific steps are such as
Under:
Step 1: interior tubing string and outer tubing string reverse thread are linked together on the ground, by the upper seal bore of outer tubing string
Cooperate with the upper seal of interior tubing string, self sealing structure in realization, by the lower sealing of lower seal cylinder and interior tubing string on outer tubing string
Circle cooperation realizes lower self sealing structure, is sent to predetermined position in well together with rod string；
Step 2: interior tubing string and outer tubing string reach in well behind predetermined position, lifting from the top and puting down tubing string hangs over suspension arrangement seat
On bunch tube, it is pumped into the mortar of the gravel containing low-density from rod string, the annular between screen casing and oil reservoir is entered by inlet opening
Space, and flow forward, when mortar reaches the right end of tubing string, mortar continues by lower screen casing, lower washing pipe into interior tubing string
It flows to the left, mortar is flowed out from liquid backflow hole, into the annular space between rod string and bunch tube, is finally returned to ground；Sand
The gravel of slurry is blocked in the outside of lower screen casing, is gradually accumulated to form retrofilling layer；Continue pump note mortar, when mortar pressure rise
To 10MPa, pushes unlatching spool to move right to positioning circular ring plate position, lower slurry placement channel 23 is opened；
Gravel slurry containing low-density is pumped into rod string step 3: continuing through, mortar by inlet opening enter screen casing and
Annular space between oil reservoir, when mortar reaches lower slurry placement channel, screen casing enters inside screen casing and passes through in mortar process
Lower slurry placement channel enters interior tubing string and flows to the left, flows out from liquid backflow hole, empty into the annular between rod string and bunch tube
Between, it is finally returned to ground, the gravel in mortar is blocked in the outside of middle screen casing, and is gradually accumulated and to form middle filling layer；After
Continuous pump note mortar pushes unlatching spool to move right to positioning circular ring plate position, upper mortar is filled when pressure rise to 15MPa
Fill channel is opened；
Gravel slurry containing low-density is pumped into rod string step 4: continuing through, mortar by inlet opening enter screen casing and
Annular space between oil reservoir, when mortar reaches upper slurry placement channel, inside screen casing of the mortar by the entrance of upper screen casing simultaneously
Enter interior tubing string through upper slurry placement channel to flow to the left, be flowed out from liquid backflow hole, into the annular between rod string and bunch tube
Space is finally returned to ground, and the gravel in mortar is blocked in the outside of screen casing, and is gradually accumulated and to form filling layer；
Step 5: rotating forward upper lifting pipe post after rod string 20 encloses on ground, realizes operation of giving up, interior tubing string is risen
Oil well, construction terminate；After above-mentioned steps, realizes and gravel packing operations are segmented to horizontal well long well section.
It is detailed in attached drawing 6, the present invention stays well construction schematic diagram,
Upper lifting pipe post after rod string 20 encloses is rotated forward on ground, operation of giving up is realized, interior tubing string is played into producing well, is applied
Work terminates.
It is above-mentioned referring to embodiment to the long well section segmented gravel filling tubing string of the horizontal well a kind of and its process into
Capable detailed description is illustrative without being restrictive, and can enumerate several embodiments according to limited range, therefore
Change and modification in the case where not departing from present general inventive concept should belong within protection scope of the present invention.
Claims (6)
1. a kind of long well section segmentation gravel of horizontal well fills tubing string, it is characterized in that: including interior tubing string and outer tubing string, said inner tube
Column includes the rod string (1) being successively spirally connected from left to right, by-pass means (4), upper washing pipe (6), middle washing pipe (12) and lower washing pipe
(17), the middle washing pipe front end and rear end pass through filling valve system respectively and connect with upper washing pipe (6), lower washing pipe (17), described to fill
It fills out valve system to include outer sleeve (13), open spool (8) and positioning circular ring plate (10), between upper washing pipe (6) and middle washing pipe (12)
Be spirally connected between outer sleeve, middle washing pipe (12) and lower washing pipe (17) outer sleeve that is spirally connected, and the outer sleeve radial symmetric is equipped with pack hole,
Pack hole constitutes slurry placement channel (21) by opening spool regulation, and the by-pass means are equipped with inlet opening (19) and return liquid
Hole (20)；The outer tubing string includes the drill sleeve string (2) being successively spirally connected from left to right, suspension arrangement (3), upper screen casing (5), upper close
Sealed tube (22), middle screen casing (11), lower seal cylinder (24) and lower screen casing (16), said inner tube column is placed in outer tubing string inner cavity, and is led to
It is affixed in one to cross reverse thread.
2. the long well section segmentation gravel of horizontal well according to claim 1 fills tubing string, it is characterized in that: after the outer sleeve
End is bolted with positioning circular ring plate (10), and positioning circular ring plate, which is placed in, to be opened on rear side of spool, plays the positioning action for opening spool.
3. the long well section segmentation gravel of horizontal well according to claim 1 fills tubing string, it is characterized in that: the outer tubing string
Upper seal bore constitutes upper self sealing structure by the upper seal of interior tubing string, and the lower seal cylinder of outer tubing string passes through close under interior tubing string
Seal constitutes lower self sealing structure.
4. the long well section segmentation gravel of horizontal well according to claim 1 fills tubing string, it is characterized in that: the outer tubing string
Suspension arrangement is suspended on the tail portion of bunch tube by slips.
5. the long well section segmentation gravel of horizontal well according to claim 1 fills tubing string, it is characterized in that: the outer tubing string
Lower screen casing lower end is bolted with guide head (18).
6. a kind of process using the filling tubing string of segmented gravel described in power 1, it is characterized in that: being filled using segmented gravel
It when filling out tubing string progress gravel packing operations, is filled using low-density gravel, utilizes the regulation of filling valve system, complete segmentation gravel
Packing job, the specific steps are as follows:
Step 1: interior tubing string and outer tubing string reverse thread are linked together on the ground, by the upper seal bore of outer tubing string with it is interior
The upper seal of tubing string cooperates, and self sealing structure in realization matches the lower seal of lower seal cylinder and interior tubing string on outer tubing string
It closes, realizes lower self sealing structure, be sent to predetermined position in well together with rod string；
Step 2: interior tubing string and outer tubing string reach in well behind predetermined position, lifting from the top and puting down tubing string makes suspension arrangement seat hang over casing
On string, it is pumped into the mortar of the gravel containing low-density from rod string, enters the annular space between screen casing and oil reservoir by inlet opening,
And flow forward, when mortar reaches the right end of tubing string, mortar enters the continuation of interior tubing string by lower screen casing, lower washing pipe and flows to the left
Dynamic, mortar is flowed out from liquid backflow hole, into the annular space between rod string and bunch tube, is finally returned to ground；The gravel of mortar
Stone is blocked in the outside of lower screen casing, is gradually accumulated to form retrofilling layer；Continue pump note mortar, when mortar pressure rise extremely
10MPa pushes unlatching spool to move right to positioning circular ring plate position, lower slurry placement channel is opened；
Gravel slurry containing low-density is pumped into rod string step 3: continuing through, mortar enters screen casing and oil reservoir by inlet opening
Between annular space, when mortar reaches lower slurry placement channel, mortar pass through in screen casing enter inside screen casing and through lower sand
Slurry filling channel enters interior tubing string and flows to the left, flows out from liquid backflow hole, into the annular space between rod string and bunch tube, most
Ground is returned to eventually, and the gravel in mortar is blocked in the outside of middle screen casing, and is gradually accumulated and to form middle filling layer；Continue pump note
Mortar pushes unlatching spool to move right to positioning circular ring plate position, by upper slurry placement channel when pressure rise to 15MPa
It opens；
Gravel slurry containing low-density is pumped into rod string step 4: continuing through, mortar enters screen casing and oil reservoir by inlet opening
Between annular space, when mortar reaches upper slurry placement channel, inside the screen casing that mortar enters by upper screen casing and through upper
Slurry placement channel enters interior tubing string and flows to the left, flows out from liquid backflow hole, into the annular space between rod string and bunch tube,
It is finally returned to ground, the gravel in mortar is blocked in the outside of screen casing, and is gradually accumulated and to form filling layer；
Step 5: rotating forward upper lifting pipe post after rod string 20 encloses on ground, operation of giving up is realized, interior tubing string is risen fuel-displaced
Well, construction terminate；After above-mentioned steps, realizes and gravel packing operations are segmented to horizontal well long well section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910550424.8A CN110242259A (en) | 2019-06-24 | 2019-06-24 | The long well section segmented gravel filling tubing string and its process of horizontal well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910550424.8A CN110242259A (en) | 2019-06-24 | 2019-06-24 | The long well section segmented gravel filling tubing string and its process of horizontal well |
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| CN110242259A true CN110242259A (en) | 2019-09-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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