CN107191146B - Coal bed gas sand clean out pipe string and its sand washing method - Google Patents
Coal bed gas sand clean out pipe string and its sand washing method Download PDFInfo
- Publication number
- CN107191146B CN107191146B CN201710588651.0A CN201710588651A CN107191146B CN 107191146 B CN107191146 B CN 107191146B CN 201710588651 A CN201710588651 A CN 201710588651A CN 107191146 B CN107191146 B CN 107191146B
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- pipe column
- flushing pipe
- sealing
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- 239000004576 sand Substances 0.000 title claims abstract description 149
- 238000005406 washing Methods 0.000 title claims abstract description 71
- 239000003245 coal Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 81
- 238000011010 flushing procedure Methods 0.000 claims abstract description 80
- 238000002955 isolation Methods 0.000 claims abstract description 19
- 210000002445 nipple Anatomy 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000004880 explosion Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000006748 scratching Methods 0.000 claims description 3
- 230000002393 scratching effect Effects 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 2
- 238000006062 fragmentation reaction Methods 0.000 claims description 2
- 238000005422 blasting Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000012856 packing Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 206010024453 Ligament sprain Diseases 0.000 description 2
- 208000010040 Sprains and Strains Diseases 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a kind of coal bed gas sand clean out pipe string and its sand washing methods, the isolation tubing string of the tripping in of well head is hung over including sitting, from the sand-flushing pipe column of well head tripping in, it is mounted on sand-flushing pipe column front, the sand washing head close to sand washing face, the self-styled sand control circulation seal device being mounted in the middle part of sand-flushing pipe column, sand-flushing pipe column upper end stretch out well head, between sand-flushing pipe column and well head by sealing device seal, sand washing medium by entrance injection sand-flushing pipe column with annular space between tubing string is isolated；When sand washing, sand washing medium by entrance inject sand washing oil pipe with annular space between tubing string is isolated, since the packing of well mouth sealing device, self-styled sand control circulating sub Self-sealing valve and packoff nipple sealing element acts on, medium can only enter sand-flushing pipe column by self-styled sand control circulating sub circulation port, it is sprayed from sand washing head, realizes sand washing.When being returned on sand washing medium, since packoff nipple packing sand-flushing pipe column returns out well head from the annular space of disrance sleeve and completion tubular column with tubing annulus, sand washing medium is isolated.Side sand washing as a result, side lower tubular column, the technique for realizing continuous sand flushing.
Description
Technical field
The present invention relates to coal bed gas well sand washing technology, especially a kind of coal bed gas sand clean out pipe string and its sand washing method.
Background technique
Currently, domestic coal bed gas well mostly uses greatly casing or sieve tube completion, in recovery process coal ash with coal bed gas into
Enter pit shaft, be gradually accumulated, influence gas production, needs periodically to carry out sand-flushing.Domestic existing sand washing technology mainly has continuously
Oil pipe sand washing technology and conventional oil pipe sand washing technology.
Using coiled tubing sand washing, coordinative composition of equipments is at high cost, cannot obtain good economic benefit, and conventional oil pipe rushes
Sand, sand washing medium are injected by well mouth oil pipe, make up a joint and termination of pumping is needed to operate, and sand washing process is discontinuous, and coal dust is fallen after rise at this time, are held
Easily there is the risk of sand card.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of coal bed gas sand clean out pipe string and its sand washing methods, can not
The technology of continuous sand flushing is realized using coiled tubing.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that: a kind of coal bed gas sand clean out pipe string, including sit
The isolation tubing string for hanging over the tripping in of well head is mounted on sand-flushing pipe column front, close to sand washing face from the sand-flushing pipe column of well head tripping in
Well head, sand-flushing pipe column are stretched out in sand washing head, the self-styled sand control circulation seal device being mounted in the middle part of sand-flushing pipe column, sand-flushing pipe column upper end
Between well head by sealing device seal, sand washing medium by entrance injection sand-flushing pipe column with annular space between tubing string is isolated；
Self-styled sand control circulation seal device, including the self-styled sand control circulating sub component that is located above and underlying close
Seal short-pitch components, self-styled sand control circulating sub component and packoff nipple component pass through the connecting tube covered in the two outer wall and be linked to be one
Body；
Self-styled sand control circulating sub component include top connection, circulating sub, protective case, circlip, sealing ring, explosion plate valve,
Movable sleeve, sealing ring, cut off, top connection, connecting tube and circulating sub are connected through a screw thread, and will be mounted on by clearance fit
Protective case outside circulating sub is fixed, and movable sleeve is mounted on circulating sub internal upper part, realizes sealing by two groups of sealing rings, living
Dynamic set initial position is limited by cutting off, and movable sleeve inner upper end, which is formed with, extends out step, and explosion plate valve is mounted on movable set upper side
Extend out in step, realize sealing by two groups of sealing rings, the top of explosion plate valve is fixed by circlip；In circulating sub inner wall
Lower part is provided with limiting stand, for controlling movable sleeve downward storke after cutting off, in limiting stand and positioned at the guarantor of initial position
Design has along the axial and circumferential directions that equally distributed circulation port, limiting stand block downlink on circulating sub ontology between sheath lower end
Movable sleeve when, movable sleeve downlink close circulation port；
Packoff nipple component includes central tube, multiple fixed rings, multiple sealing elements and lower contact, connecting tube, central tube, under
It is threadedly coupled between connector, multiple sealing elements are covered on central tube using interference fit, between two neighboring sealing element, connecting tube
Between adjacent seals, fixed ring is respectively set between lower contact and adjacent seals, and limit is tightened by upper and lower connector
Position；Sealing element is the internal rotary table for having through-hole, the minor diameter bottom end of rotary table outer wall is provided with outer step, inside sealing element
Through-hole structure are as follows: the circular hole with center pipe outside diameter interference fit, close to rotary table major diameter bottom end, circular hole is connected in turn outer
The interior step and horn mouth expanded, the male cone (strobilus masculinus) of rotary table are the sealing cone with isolated tube column sealing, and horn mouth provides for sealing element
Extruding allowance, fixed ring match with outer step and interior step, and outer step and interior step are for blocking fixed ring；
Top connection connects sand-flushing pipe column to sealing wellhead, terminates above sand-flushing pipe column to sand face under lower contact.
The protective case is gap-matched with circulating sub, fit clearance 0.05-0.1mm.
The circulation port aperture of circulating sub design is 5mm, circumferentially with axial uniform Boulez.
It is provided with chamfering on the male cone (strobilus masculinus) contacted with isolation tubing string, avoids scratching sealing when up and down convenient for tubing string
Part upper surface.
The sealing element is made of the high abrasion fluorubber of addition graphite content.
The sealing element installs 2 altogether.
The sand washing method of above-mentioned coal bed gas sand clean out pipe string, comprising the following steps:
(1) equipment is installed: installation wellhead assembly, and tripping in, which is isolated tubing string and is sat, hangs over well head, installs well mouth sealing device, even
Connect sand-flushing pipe column and sand washing head；50 meters are above mentioned above sand-flushing pipe column to sand face；First self-styled sand control circulation seal device is connected,
Installation site is recorded, top sand-flushing pipe column is connected；
(2) turn on pump sand washing continues lower sand-flushing pipe column, in sand washing under sand-flushing pipe column；Transfer self-styled sand control circulation seal dress
When setting to 20 meters above isolation tubing string lower end, termination of pumping；
(3) turn on pump, injection liquid, which is sprained, out of sand-flushing pipe column presses the circulating sub group of the self-styled sand control circulation seal device of closing
Part punctures explosion plate valve, termination of pumping；
(4) second self-styled sand control circulation seal device and sand-flushing pipe column, turn on pump, from well head injection sand cleaning fluid punching are connected
Sand；
(5) step (2)-(4) are repeated, until sand washing terminates；
(6) sand-flushing pipe column out is played, acts isolation tubing string, gas producing device is installed.
The isolation pipe string running depth is 100-500 meters.
The beneficial effects of the present invention are: routine oil pipe can be used to realize continuous sand washing technique；Save coiled tubing sand washing at
This.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of coal bed gas sand clean out pipe string of the present invention.
Fig. 2 is the structural schematic diagram for the self-styled sand control circulating sub component that the present invention can close self-styled circulation isolating tool.
Fig. 3 is the structural schematic diagram of the packoff nipple component of the self-styled sand control circulation seal device of the present invention.
Fig. 4 is the structural schematic diagram of the sealing element of the packoff nipple component of the self-styled sand control circulation seal device of the present invention.
Structural schematic diagram when Fig. 5 is the work of the self-styled sand control circulation seal device of the present invention.
Structural schematic diagram when Fig. 6 is the closing of the self-styled sand control circulation seal device of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description:
As shown in figures 1 to 6, coal bed gas sand clean out pipe string of the invention hangs over the isolation tubing string of the tripping in of well head 49 including sitting
41, from the sand-flushing pipe column 42 of 49 tripping in of well head, it is mounted on 42 front of sand-flushing pipe column, the sand washing head 43 close to sand washing face 44, is installed
Well head 49 is stretched out in self-styled sand control circulation seal device at the middle part of sand-flushing pipe column 42,42 upper end of sand-flushing pipe column, sand-flushing pipe column 42 with
Sealed between well head 49 by sealing device 47, sand washing medium by entrance 48 inject sand-flushing pipe column 42 be isolated between tubing string 41
Annular space；
Self-styled sand control circulation seal device, including the self-styled sand control circulating sub component 31 that is located above and underlying
Packoff nipple component 32, self-styled sand control circulating sub component and packoff nipple component 32 pass through the connecting tube 30 covered in the two outer wall
It is connected；
Self-styled sand control circulating sub component 31 includes top connection 1, circulating sub 2, protective case 3, circlip 4, sealing ring 5, quick-fried
Fragmentation valve 6 movable sleeve 7, sealing ring 8, cuts off 9, top connection 1, connecting tube 30 and circulating sub 2 and is connected through a screw thread, and will lead to
It crosses the protective case 3 that clearance fit is mounted on outside circulating sub 2 to fix, movable sleeve 7 is mounted on 2 internal upper part of circulating sub, passes through
Two groups of sealing rings 8 realize sealing, and 7 initial position of movable sleeve is limited by cutting off 9, and 7 inner upper end of movable sleeve, which is formed with, extends out step,
Explosion plate valve 6 is mounted on the extending out in step of 7 upper end of movable sleeve, passes through two groups of sealing rings 5 and realizes sealing, the top of explosion plate valve 6
End is fixed by circlip 4；2 inner wall lower of circulating sub is provided with limiting stand 11, for controlling movable sleeve 7 after cutting off 9
Downward storke, designing on 2 ontology of circulating sub between limiting stand 11 and 3 lower end of protective case positioned at initial position has along axis
To with circumferential equally distributed circulation port 2-1, when limiting stand 11 blocks the movable sleeve 7 of downlink, 7 downlink of movable sleeve closes circulation port
2-1；
Packoff nipple component 32 includes central tube 22, multiple fixed rings, multiple sealing elements 24 and lower contact 28, connecting tube
30, it is threadedly coupled between central tube 22, lower contact 28, multiple sealing elements 24 are covered on central tube 22 using interference fit, adjacent
It is set respectively between two sealing elements 24, between connecting tube 30 and adjacent seals 24, between lower contact 28 and adjacent seals 24
Fixed ring is set, and limit is tightened by upper and lower connector；Sealing element 24 is the internal rotary table for having through-hole, in the small of rotary table outer wall
Diameter base end is provided with outer step 24-5, the through-hole structure inside sealing element 24 are as follows: with 22 outer diameter of central tube interference fit
Circular hole 24-6, close to rotary table major diameter bottom end, circular hole 24-6 is connected with the interior step 24-4 and horn mouth 24-2 extended out in turn,
The male cone (strobilus masculinus) 24-3 of rotary table be with sealing cone tubing string 41 be isolated sealed, horn mouth 24-2 provides extruding allowance for sealing element,
Fixed ring matches with outer step 24-5 and interior step 24-4, and outer step 24-5 and interior step 24-4 are for blocking fixed ring；
Top connection 1 connects sand-flushing pipe column to sealing wellhead, the lower termination sand-flushing pipe column of lower contact 28 to sand face top.
The protective case 3 is gap-matched with circulating sub 2, fit clearance 0.05-0.1mm.
The aperture circulation port 2-1 that the circulating sub 2 designs is 5mm, circumferentially with axial uniform Boulez.
It is provided with chamfering 24-1 on the male cone (strobilus masculinus) 24-3 contacted with isolation tubing string 41, is kept away when up and down convenient for tubing string
Exempt to scratch sealing element upper surface.
The sealing element 24 is made of the high abrasion fluorubber of addition graphite content.
The sealing element 24 installs 2 altogether.
The sand washing method of above-mentioned coal bed gas sand clean out pipe string, comprising the following steps:
(1) equipment is installed: installation wellhead assembly, and tripping in, which is isolated tubing string and is sat, hangs over well head, installs well mouth sealing device, even
Connect sand-flushing pipe column and sand washing head；50 meters are above mentioned above sand-flushing pipe column to sand face；First self-styled sand control circulation seal device is connected,
Installation site is recorded, top sand-flushing pipe column is connected；
(2) turn on pump sand washing continues lower sand-flushing pipe column, in sand washing under sand-flushing pipe column；Transfer self-styled sand control circulation seal dress
When setting to 20 meters above isolation tubing string lower end, termination of pumping；
(3) turn on pump, injection liquid, which is sprained, out of sand-flushing pipe column presses the circulating sub group of the self-styled sand control circulation seal device of closing
Part punctures explosion plate valve, termination of pumping；
(4) second self-styled sand control circulation seal device and sand-flushing pipe column, turn on pump, from well head injection sand cleaning fluid punching are connected
Sand；
(5) step (2)-(4) are repeated, until sand washing terminates；
(6) sand-flushing pipe column out is played, acts isolation tubing string, gas producing device is installed.
The isolation pipe string running depth is 100-500 meters.
After self-styled sand control circulating sub component 31 is connect with sand-flushing pipe column, due to the plugging action of its explosion plate valve 6, sand washing
Medium cannot be injected by well head sand-flushing pipe column, can only be injected from annular space, then enter lower part sand clean out pipe from the tool circulation port
Column realizes sand washing.So that realization sand washing process makes up a joint, not termination of pumping is worked continuously.It needs directly to be perfused from well head top oil pipe
When sand washing, circulation port 2-1 can be closed, pressure of spraining breakdown 6 valve block of explosion plate valve is connected to lower tubular column.It can be from well head top oil
Sand washing is directly perfused in pipe, and the compression shear that needs to sprain is disconnected to cut off 9 closing circulation port 2-1, continues to sprain and breakdown 6 valve block of explosion plate valve is pressed to make up and down
Tubing string connection.
After packoff nipple component 32 is connect with sand-flushing pipe column, due to 24 male cone (strobilus masculinus) 24-1 of its sealing element be isolated in tubing string 41
Surface gluing, sealing, fluid cannot pass through sand-flushing pipe column and flow up and down with the annular space being isolated between tubing string 41.Sealing element 24 uses
The high abrasion fluorubber of addition graphite content is made, and has heat resistant and wear resistant effect.The design of sealing element 24 has outer step 24-5, interior
Step 24-4, horn mouth 24-2, male cone (strobilus masculinus) 24-3.Outer step 24-5, interior step 24-4 match for fixed ring 23,25,26,27
Close, male cone (strobilus masculinus) 24-3 be be isolated tubing string 41 seal sealing cone.The sealing element that is designed as of horn mouth 24-2 is provided more than extruding
Amount.It avoids scratching sealing element upper surface when chamfering 24-1 is up and down convenient for tubing string between male cone (strobilus masculinus) 24-3 and upper surface.The work
Tool connect with sand-flushing pipe column after, due to the sealing function of its sealing element, fluid cannot pass through sand-flushing pipe column be isolated between tubing string
Annular space flow up and down.
When the two synergy, top connection 1 connects sand-flushing pipe column to sealing wellhead, the lower termination sand-flushing pipe column of lower contact 28 to sand
Above face.It tripping in isolation tubing string 41 and sits first and hangs over well head, then tripping in sand-flushing pipe column and self-styled circulation can be closed insulate
Tool is connected on sand-flushing pipe column, by the self-styled circulating sub component of its design, packoff nipple component, realizes sand washing medium not
Injected by well mouth oil pipe, and by sand clean out pipe with the injection of the outer annular space of tubing string 41 be isolated, without termination of pumping when making up a joint, realization is continuously
The function of sand washing.
Sand flushing device upper end connects sand-flushing pipe column 42 to well head, and it is close to pass through sealing device 47 between sand-flushing pipe column 42 and well head
Envelope.Lower end connects sand-flushing pipe column 42 and starts the cycle over to 44 top 20m of sand face or so.When sand washing, sand washing medium passes through 48 note of entrance
Enter sand-flushing pipe column 42 with annular space between tubing string 41 is isolated, due to well mouth sealing device 47, self-styled sand control circulating sub component 32 from
The packing effect of valve and 32 sealing element of packoff nipple component is sealed, medium can only be recycled by self-styled sand control circulating sub component 31
Hole enters sand-flushing pipe column 42, sprays from sand washing head 43, realizes sand washing.When being returned on sand washing medium, due to 32 envelope of packoff nipple component
Well head is returned out from the annular space of isolation tubing string 41 and completion tubular column 40 with 41 annular space of tubing string, sand washing medium is isolated every sand-flushing pipe column 42
49.Side sand washing as a result, side lower tubular column, the technique for realizing continuous sand flushing.When packoff nipple component 32 is soon detached from isolation tubing string 41
When losing sealing effect, self-styled 31 circulation port of circulating sub component is closed by the disconnected pin of compression shear of spraining, continues pressure opening circulation of spraining
Then 31 Self-sealing valve of short-pitch components accesses a set of sand flushing device and continues to construct, again until sand washing terminates.
Briefly, sand washing medium from well head inject, through can be closed self-styled circulation isolating tool upper end sand-flushing pipe column and every
From tubing annulus, due to the effect of packoff nipple component, medium can only enter in sand-flushing pipe column through circulating sub circulation port, due to
The packing of explosion plate valve acts on, make sand washing medium can only downlink, finally sprayed from sand washing head, through isolation tubing string 41 and completion tubular column
35 annular spaces return out well head.To realize that the sand-flushing pipe column not termination of pumping that makes up a joint continuously is constructed.With the continuous downlink of sand-flushing pipe column, when close
Seal under short-pitch components is more than seal failure when being isolated deep under tubing string deeply.Therefore, when packoff nipple component is soon detached from isolation tubing string
When losing sealing effect, self-styled circulation shorted component circulation port is closed, circulating sub Self-sealing valve is opened, then accesses a set of punching again
Sand device continues to construct, until sand washing terminates.
In conclusion the contents of the present invention are not limited in the above embodiments, the knowledgeable people in same area can
Can propose other embodiments easily within technological guidance's thought of the invention, but this embodiment is included in this hair
Within the scope of bright.
Claims (8)
1. a kind of coal bed gas sand clean out pipe string, which is characterized in that the isolation tubing string (41) that the tripping in of well head (49) is hung over including sitting, from
The sand-flushing pipe column (42) of well head (49) tripping in is mounted on sand-flushing pipe column (42) front, the sand washing head (43) close to sand washing face (44),
Well head (49) are stretched out in the self-styled sand control circulation seal device being mounted in the middle part of sand-flushing pipe column (42), sand-flushing pipe column (42) upper end, punching
It is sealed between sandpipe column (42) and well head (49) by sealing device (47), sand washing medium injects sand-flushing pipe column by entrance (48)
(42) with annular space between tubing string (41) is isolated；
Self-styled sand control circulation seal device, including the self-styled sand control circulating sub component (31) that is located above and underlying close
It seals short-pitch components (32), self-styled sand control circulating sub component and packoff nipple component (32) pass through the connecting tube covered in the two outer wall
(30) it is connected；
Self-styled sand control circulating sub component (31) includes top connection (1), circulating sub (2), protective case (3), circlip (4), first
Sealing ring (5), explosion plate valve (6), movable sleeve (7), the second sealing ring (8), cut off (9), top connection (1), connecting tube (30) with
Circulating sub (2) is connected through a screw thread, and will be mounted on the external protective case (3) of circulating sub (2) by clearance fit and be fixed,
Movable sleeve (7) is mounted on circulating sub (2) internal upper part, realizes sealing by two group of second sealing ring (8), movable sleeve (7) is initial
Position is limited by cutting off (9), and movable sleeve (7) inner upper end, which is formed with, extends out step, and explosion plate valve (6) is mounted on movable sleeve (7)
Upper end extends out in step, realizes sealing by two group of first sealing ring (5), the top of explosion plate valve (6) is solid by circlip (4)
It is fixed；In circulating sub (2), inner wall lower is provided with limiting stand (11), controls every trade under movable sleeve (7) afterwards for cutting off (9)
Journey, designing on circulating sub (2) ontology between limiting stand (11) and movable sleeve (7) lower end positioned at initial position has along axis
To with circumferential equally distributed circulation port (2-1), when limiting stand (11) blocks movable sleeve (7) of downlink, movable sleeve (7) downlink is closed
Closed loop hole (2-1)；
Packoff nipple component (32) includes central tube (22), multiple fixed rings, multiple sealing elements (24) and lower contact (28), connection
It is threadedly coupled between pipe (30) and central tube (22) and between central tube (22) and lower contact (28), multiple sealing elements (24) are adopted
With interference engagement sleeves on central tube (22), between two neighboring sealing element (24), connecting tube (30) and adjacent seals (24)
Between, between lower contact (28) and adjacent seals (24) fixed ring is respectively set, and limit is tightened by upper and lower connector；It is close
Sealing (24) is the internal rotary table for having through-hole, is provided with outer step (24-5) in the minor diameter bottom end of rotary table outer wall, is sealed
The internal through-hole structure of part (24) are as follows: the circular hole (24-6) with central tube (22) outer diameter interference fit, close to rotary table major diameter bottom
Face end, circular hole (24-6) are connected with the interior step (24-4) and horn mouth (24-2) extended out, the male cone (strobilus masculinus) (24-3) of rotary table in turn
For with sealing cone that tubing string (41) sealing is isolated, horn mouth (24-2) provides extruding allowance, fixed ring and between outer land for sealing element
Rank (24-5) and interior step (24-4) match, and outer step (24-5) and interior step (24-4) are for blocking fixed ring；
Top connection (1) connects sand-flushing pipe column (42) to sealing wellhead, terminates above sand-flushing pipe column (42) to sand face under lower contact (28).
2. coal bed gas sand clean out pipe string according to claim 1, which is characterized in that the protective case (3) is adopted with circulating sub (2)
With clearance fit, fit clearance 0.05-0.1mm.
3. coal bed gas sand clean out pipe string according to claim 1, which is characterized in that the circulation port of circulating sub (2) design
The aperture (2-1) is 5mm, circumferentially with axial uniform Boulez.
4. coal bed gas sand clean out pipe string according to claim 1, which is characterized in that it is described be isolated tubing string (41) sealing outer cone
It is provided with chamfering (24-1) on face (24-3), avoids scratching sealing element upper surface when up and down convenient for tubing string.
5. coal bed gas sand clean out pipe string according to claim 1, which is characterized in that the sealing element (24) using addition graphite at
The high abrasion fluorubber divided is made.
6. coal bed gas sand clean out pipe string according to claim 1, which is characterized in that the sealing element (24) installs 2 altogether.
7. the sand washing method of coal bed gas sand clean out pipe string as described in claim any one of 1-6, which is characterized in that sand washing method includes
Following steps:
(1) equipment is installed: installation wellhead assembly, and tripping in, which is isolated tubing string and is sat, hangs over well head, installs well mouth sealing device, connection punching
Sandpipe column and sand washing head；50 meters are above mentioned above sand-flushing pipe column to sand face；Connect first self-styled sand control circulation seal device, record
Installation site connects top sand-flushing pipe column；
(2) turn on pump sand washing continues lower sand-flushing pipe column, in sand washing under sand-flushing pipe column；Transfer self-styled sand control circulation seal device extremely
When being isolated above tubing string lower end 20 meters, termination of pumping；
(3) turn on pump, injection liquid, which is sprained, out of sand-flushing pipe column presses the circulating sub component of the self-styled sand control circulation seal device of closing, hits
Drilling and blasting fragmentation valve, termination of pumping；
(4) second self-styled sand control circulation seal device and sand-flushing pipe column are connected, turn on pump injects sand cleaning fluid sand washing from well head；
(5) step (2)-(4) are repeated, until sand washing terminates；
(6) sand-flushing pipe column out is played, acts isolation tubing string, gas producing device is installed.
8. the sand washing method of coal bed gas sand clean out pipe string according to claim 7, which is characterized in that the isolation tubing string tripping in is deep
Degree is 100-500 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710588651.0A CN107191146B (en) | 2017-07-18 | 2017-07-18 | Coal bed gas sand clean out pipe string and its sand washing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710588651.0A CN107191146B (en) | 2017-07-18 | 2017-07-18 | Coal bed gas sand clean out pipe string and its sand washing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107191146A CN107191146A (en) | 2017-09-22 |
| CN107191146B true CN107191146B (en) | 2019-04-12 |
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| CN104695915A (en) * | 2015-03-16 | 2015-06-10 | 山东普瑞思德石油技术有限公司 | Sand washing and prevention integrated completion pipe string and control method thereof |
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| US5320178A (en) * | 1992-12-08 | 1994-06-14 | Atlantic Richfield Company | Sand control screen and installation method for wells |
| CN2871805Y (en) * | 2006-01-18 | 2007-02-21 | 中海油田服务股份有限公司 | Positive-punch and reverse-circulation sand-washing tool |
| CN2898267Y (en) * | 2006-06-04 | 2007-05-09 | 冯力 | Positive sand washer |
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