CN108915660A - Fracturing method of coiled tubing with internal blowout prevention function - Google Patents
Fracturing method of coiled tubing with internal blowout prevention function Download PDFInfo
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- CN108915660A CN108915660A CN201811019525.4A CN201811019525A CN108915660A CN 108915660 A CN108915660 A CN 108915660A CN 201811019525 A CN201811019525 A CN 201811019525A CN 108915660 A CN108915660 A CN 108915660A
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- sliding sleeve
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000002265 prevention Effects 0.000 title claims abstract description 36
- 238000010276 construction Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 36
- 239000010959 steel Substances 0.000 claims description 36
- 238000005516 engineering process Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 14
- 238000005192 partition Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002146 bilateral effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- 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
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a fracturing method of a coiled tubing with an internal blowout prevention function, which is characterized in that a coiled tubing connector, a safety joint, a bottom hole blowout prevention valve, an ejector, a coiled tubing bottom packer, a casing collar positioner and a centering head are sequentially connected from top to bottom through screw threads, and the bottom hole blowout prevention valve is connected between the ejector and the safety joint, so that the function of closing an oil discharge channel at the bottom hole in real time is realized, and the problem of well control risk caused by the breakage of the coiled tubing when the coiled tubing is pulled out or the position is adjusted is effectively avoided. The bottom blowout prevention valve adopts a double-channel structural design, has the functions of forward unblocked ball passing and reverse stopping, and simultaneously, the structural design of the internal differential pressure sliding sleeve ensures that the valve can remove the function of reverse stopping when needed, so that the bottom blowout prevention effect of the coiled tubing is realized, the well control risk is effectively reduced, and the influence on the coiled tubing dragging fracturing construction operation is avoided.
Description
Technical field
The invention belongs to oil gas field stimulation technology fields, and in particular to a kind of coiled tubing with interior blowout prevention function
Fracturing process, more particularly to the coiled tubing with interior blowout prevention function with the pressure break side of underseal drag fracturing process pipe string
Method is used in coiled tubing drag fracturing construction operation.
Background technique
Structure of the coiled tubing with underseal staged fracturing working string of domestic and international You Fu company research and development application is from top to bottom
Substantially take such as flowering structure：Coiled tubing connector, safety joint, injector, coiled tubing bottom packer, casing coupling
Locator, righting head enter the tool pipe string of well at least from injector to be freely connected to always inside and outside upper tube.When rise coiled tubing or
When dragging tubing string adjustment drilling tool position, once breakage occurs in the coiled tubing for acting lubricator, high pressure will in well
It is out of control from damage location ejection, it will be unable to continue lift pipe string, there are high well control risks.When encountering such case, if I
Emergency closing well measure can be pre-designed on working string, so that it may realize in bottom-hole shut-in, prevent high pressure warp in well
Coiled tubing is crossed to scurry out.
Summary of the invention
The present invention provides a kind of fracturing process of coiled tubing with interior blowout prevention function, and purpose is rising to connect first is that overcoming
When continuous oil pipe, easily there is breakage in coiled tubing, and high pressure is sprayed from breakage in well, caused by well control risk problem；Purpose second is that
While blowout prevention, reducing well control risk, coiled tubing drag fracturing construction operation is not impacted；Purpose is third is that in shaft bottom
Oil is closed in real time and puts channel, and well control risk caused by coiled tubing breakage is effectively reduced.
For this purpose, the present invention provides a kind of fracturing process of coiled tubing with interior blowout prevention function, using with interior anti-
The coiled tubing band underseal drag fracturing process pipe string of function is sprayed, it is continuous on coiled tubing including being sequentially connected in series from top to bottom
Oil pipe connector, safety joint, bottom hole blowout control valve, injector, coiled tubing bottom packer, casing collar locator (CCL) and righting
Head, the bottom hole blowout control valve include top connection and lower contact, and the lower end of top connection has external screw thread, and the upper end of lower contact has
Internal screw thread, internal and external threads are cooperatively connected, and the inner cavity of the top connection forms the hollow cavity being connected to the inner cavity of lower contact, hollow
Cavity is built-in with inner sliding sleeve and bushing, and the inner sliding sleeve outer wall is connect by shear pin and clamp-screw with top connection tube wall,
The lower end inner cavity of inner sliding sleeve is the conical surface, and the lower end outer wall of inner sliding sleeve is contacted with bushing upper end inner wall, and liner outer wall connects under being close to
Head inner wall, along being axially arranged with partition in the middle part of the bushing, partition by the inner cavity of bushing along axially spaced formation binary channels, each
One ball seat is installed in channel, the inner sliding sleeve and bushing are made of high rigidity bearing steel, top connection and lower contact into
Surface carburization processing is gone；
It further include following steps：
Step 1, lower brill
Connecting, there is the coiled tubing band underseal drag fracturing process pipe string of interior blowout prevention function to form tool string, will be under the tool string
Bore, keep the binary channels of bottom hole blowout control valve to there is a channel to be in unimpeded state always in going down process, to tool string transfer to
Behind predetermined position, the position for determining fracturing technology tubing string is adjusted by casing collar locator (CCL)；
Step 2, abrasive perforating and pressure break
Make coiled tubing bottom packer setting by lifting from the top and puting down tool string, then carries out hydraulic jet perforation and pressure break is applied
Work, if in the construction process, when sand plug occur and needing to carry out backwash operation, steel ball, steel ball are put into fracturing technology tubing string
Shear pin is cut, inner sliding sleeve slides downwards under pressure, and steel ball is sitting in the ball seat in binary channels in one of channel
On, and in the space being stuck between inner sliding sleeve lower end and bushing, another channel in binary channels is reversed fluid course, reversely
Fluid course is kept unimpeded, and carries out backwash operation；
Step 3, deblocking packer
After pressing crack construction, make coiled tubing bottom removing seal for packer by above mentioning tool string；
Step 4 adjusts fracturing technology tubing string position
After the removing seal for packer of coiled tubing bottom, is readjusted by casing collar locator (CCL) and determine fracturing technology tubing string position under
One section of interval for needing fracturing reform, when adjusting fracturing technology tubing string position, if there are high pressure, fracturing technology tubing string pipes in shaft bottom
It is gushed on interior highly pressurised liquid and steel ball is pushed to move up, steel ball is withstood under inner sliding sleeve in end cone face, and the flow channel of liquid from bottom to top closes
It closes, bottom hole blowout control valve is in reverse blocking state, prevents to gush on the highly pressurised liquid of shaft bottom, plays the role of bottom hole blowout control；
Step 5 pulls out of hole
Step 1~step 4 is repeated, until coiled tubing bottom packer or injector failure in fracturing technology tubing string, pull out of hole more
Tool string is changed, in trip-out process, can still be risen if there are high pressures in shaft bottom since bottom hole blowout control valve is still in reverse blocking state
It is acted on to bottom hole blowout control.
Further, balanced valve is installed, in step 3, if due to coiled tubing bottom on the packer of the coiled tubing bottom
Up and down there are pressure difference, coiled tubing bottom packer can not be unsealed normally packer, then above mention tool string and open balanced valve, balanced valve
The pressure difference of coiled tubing bottom packer or more is ganged up and is balanced in pressure.
Further, annular groove is radially offered in the middle part of the inner sliding sleeve outer wall, outer wall top extends outward to form
Protrusion, top connection inner wall are equipped with limited step, and circlip is equipped between top connection lower end surface and bushing upper surface, is cut in step 2
After shear pin, inner sliding sleeve slides downwards under pressure, is located on the limited step of top connection by protrusion, circlip card
Enter in annular groove, slide inner sliding sleeve will not upwards again after stress downslide.
Further, the bushing is made of upper bushing, neck bush and lower bushing from top to bottom, the inner wall of upper bushing and outer
Wall is arranged with multiple sealing rings, and the outer wall of the outer wall of neck bush and lower bushing is arranged multiple sealing rings.
Further, the inner wall of the neck bush is equipped with step at installation ball seat, and step is straight close to top connection one end
Diameter is greater than the diameter close to lower contact one end.
Further, the partition is equipped with step at installation ball seat, and wall thickness of the step close to top connection one end, which is less than, to be leaned on
The wall thickness of nearly lower contact one end.
Further, the inner sliding sleeve is made of direct tube section and conical surface inner cavity section, and the diameter of direct tube section is less than the straight of steel ball
The diameter of diameter, conical surface inner cavity section is greater than the diameter of steel ball.
Further, the upper bushing lower part is conical surface inner cavity, the conical surface inner cavity of the conical surface inner cavity and inner sliding sleeve lower part
It is smoothly connected.
Further, the top connection is connected with lower contact by stopping screw.
Beneficial effects of the present invention：The fracturing process of this coiled tubing with interior blowout prevention function provided by the invention,
Realize in coiled tubing construction blowout prevention function in shaft bottom, effectively reduce coiled tubing it is damaged caused by well control risk, tubing string
In increased bottom hole blowout control valve have the function of it is positive it is unimpeded cross ball, reversed cut-off and can release when necessary reversely end,
While playing the role of coiled tubing bottom hole blowout control, coiled tubing drag fracturing construction operation will not be impacted.
The present invention is described in further details below with reference to attached drawing.
Detailed description of the invention
Fig. 1 is the coiled tubing of interior blowout prevention function with the structural schematic diagram of underseal drag fracturing process pipe string.
Fig. 2 is the positive unimpeded status diagram of bottom hole blowout control valve.
Fig. 3 is bottom hole blowout control valve reverse blocking state schematic diagram.
Fig. 4 is that reversely cut-off effect releases status diagram to bottom hole blowout control valve.
Description of symbols：
1, coiled tubing connector；2, safety joint；3, bottom hole blowout control valve；4, injector；5, coiled tubing bottom packer；6, it covers
Pipe collar locator；7, righting head；
3.1, lower contact；3.2, lower bushing；3.3, bushing；3.4, steel ball；3.5, upper bushing；3.6, circlip；3.7, clamp-screw；
3.8, shear pin；3.9, stopping screw；3.10, inner sliding sleeve；3.11, top connection；3.12, partition；3.13, ball seat；3.14, ring
Connected in star；3.15, limited step；3.16, protrusion；3.17, neck bush.
Specific embodiment
Embodiment 1：
The fracturing process for present embodiments providing a kind of coiled tubing with interior blowout prevention function, using with interior blowout prevention function
Coiled tubing band underseal drag fracturing process pipe string, as shown in Figure 1, including being sequentially connected in series the company on coiled tubing from top to bottom
Continuous oil pipe connector 1, safety joint 2, bottom hole blowout control valve 3, injector 4, coiled tubing bottom packer 5, casing collar locator (CCL) 6
With righting head 7, the bottom hole blowout control valve 3 includes top connection 3.11 and lower contact 3.1, as shown in Figure 2 to 4, top connection
3.11 lower end has external screw thread, and the upper end of lower contact 3.1 has internal screw thread, the inner cavity of the top connection 3.11 and lower contact
3.1 inner cavity forms the hollow cavity of connection, and hollow cavity is built-in with inner sliding sleeve 3.10 and bushing 3.3, the inner sliding sleeve 3.10
Outer wall is connect by shear pin 3.8 and clamp-screw 3.7 with 3.11 tube wall of top connection, and the lower end inner cavity of inner sliding sleeve 3.10 is cone
Face, and the lower end outer wall of inner sliding sleeve 3.10 is contacted with 3.3 upper end inner wall of bushing, 3.3 outer wall of bushing is close to 3.1 inner wall of lower contact,
3.3 middle part of bushing is along partition 3.12 is axially arranged with, and partition 3.12 is by the inner cavity of bushing 3.3 along axially spaced formation bilateral
Road, a ball seat 3.13 is equipped in each channel, and the inner sliding sleeve 3.10 and bushing 3.3 use high rigidity bearing steel
At top connection 3.11 and lower contact 3.1 have carried out surface carburization processing；
It further include following steps：
Step 1, lower brill
Connecting, there is the coiled tubing band underseal drag fracturing process pipe string of interior blowout prevention function to form tool string, will be under the tool string
Bore, keep the binary channels of bottom hole blowout control valve 3 to there is a channel to be in unimpeded state always in going down process, to tool string transfer to
Behind predetermined position, the position for determining fracturing technology tubing string is adjusted by casing collar locator (CCL) 6；
Step 2, abrasive perforating and pressure break
Coiled tubing bottom packer 5 is set by lifting from the top and puting down tool string, then hydraulic jet perforation is carried out and pressure break is applied
Work, if in the construction process, when sand plug occur and needing to carry out backwash operation, steel ball 3.4 is put into fracturing technology tubing string, such as
Shown in Fig. 4, steel ball 3.4 cuts shear pin 3.8, and sliding, steel ball 3.4 are sitting in bilateral to inner sliding sleeve 3.10 downwards under pressure
On ball seat 3.13 in road in one of channel, and in the space being stuck between 3.10 lower end of inner sliding sleeve and bushing 3.3, bilateral
Another channel in road is reversed fluid course, and reversed fluid course is kept unimpeded, and carries out backwash operation；
Step 3, deblocking packer
After pressing crack construction, unseal coiled tubing bottom packer 5 by above mentioning tool string；
Step 4 adjusts fracturing technology tubing string position
Packer 5 solution in coiled tubing bottom is honored as a queen, and is readjusted by casing collar locator (CCL) 6 and is determined fracturing technology tubing string position extremely
The next section of interval for needing fracturing reform, when adjusting fracturing technology tubing string position, if there are high pressure, fracturing technology tubing strings in shaft bottom
Gushing on highly pressurised liquid in managing pushes steel ball 3.4 to move up, as shown in figure 3, steel ball 3.4 is withstood under inner sliding sleeve 3.10 in end cone face, liquid
The flow channel of body from bottom to top is closed, and bottom hole blowout control valve 3 is in reverse blocking state, is prevented to gush on the highly pressurised liquid of shaft bottom, be risen
To the effect of bottom hole blowout control；
Step 5 pulls out of hole
Step 1~step 4 is repeated, until coiled tubing bottom packer 5 or injector 4 fail in fracturing technology tubing string, is pulled out of hole
Tool string is replaced, in trip-out process, still may be used if there are high pressures in shaft bottom since bottom hole blowout control valve 3 is still in reverse blocking state
Play the role of bottom hole blowout control.
Specifically, the lower brill of step 1 includes that will bore under fastening means string, and tubing string should first rush full pit shaft before entering well
Sand, scraping and latus rectum treatment process, 3 inside binary channels of bottom hole blowout control valve has a channel to be in unimpeded shape always in going down process
State keeps unimpeded inside tubing string, transfers after tool string to predetermined position, by the casing collar locator (CCL) 6 in tubing string, lead to
Test casing collar locator (CCL) 6 is crossed by the size of induction force when casing coupling to adjust and determine tubing string position.
Step 2 includes set packer and abrasive perforating and pressure break：After to tubing string positioning, made by lifting from the top and puting down
Industry tubing string sets the realization of coiled tubing bottom packer 5.At this point, the inside and outside by-pass prot by injector 4 of tubing string is connected to；
After the completion of coiled tubing bottom packer 5 is set in tubing string, hydraulic jet perforation is carried out according to the requirement of detail design and adds sand pressure
Split construction, if in the construction process, there is situations such as sand plug, when needing to carry out backwash operation, can in such a way that pitching is suppressed,
The shear pin inside bottom hole blowout control valve 3 is cut, the inner sliding sleeve of bottom hole blowout control valve 3 is made to move down into designated position, at this point, shaft bottom is anti-
The reversed fluid course of spray valve is kept unimpeded, and reversed cutoff function releases, and can carry out normal backwash operation.
The deblocking packer of step 3 refers to after pressing crack construction, needs only upper lifting pipe post to be needed to grasp when deblocking packer
Make, release the bit pressure that is applied on 5 packing element of coiled tubing bottom packer, packing element will voluntarily restore to the original state deblocking.Solution
Feng Shi, if about 5 coiled tubing bottom packer, there are larger pressure difference, when upper lifting pipe post can take the lead in mentioning out coiled tubing bottom packer
The balance valve system specially designed on 5, forces to gang up and balance the pressure of packer or more, and " negative pressure bit freezing " phenomenon can't be
This occurs in coiled tubing band underseal drag fracturing process pipe string application with interior blowout prevention function.
Step 4 includes adjusting drilling tool position, after removing seal for packer, readjusts positioning drilling tool position extremely according to step 2
Next interval for needing fracturing reform.When adjusting drilling tool position, if there are high pressures in shaft bottom, manages and gush and can push on interior highly pressurised liquid
3 inside steel ball of bottom hole blowout control valve moves up, and withstands under 3 inner sliding sleeve of bottom hole blowout control valve in end cone face, and the flowing of liquid from bottom to top is logical
Road is closed.At this point, bottom hole blowout control valve 3 is in reverse blocking state, can prevent to gush on the highly pressurised liquid of shaft bottom, effectively avoid the occurrence of because
Coiled tubing, which has ruptured lubricator or the above coiled tubing of well head out, occurs that blowout out of control phenomenon is caused to occur when endurance failure, from
And play the role of bottom hole blowout control.
It should be strongly noted that bottom hole blowout control valve provided by the invention is designed using twin-channel structure, have just
Cross ball, reversed cut-off to unimpeded and the function of reversely ending can be released when necessary, play the role of coiled tubing bottom hole blowout control,
While well control risk is effectively reduced, coiled tubing drag fracturing construction operation will not be impacted；Bottom hole blowout control valve is not
While influencing former continuous oil pipe operation tubing string normal use, oil can be closed in real time in shaft bottom and put channel, continuous oil is effectively reduced
Well control risk caused by pipe is damaged.
Particularly, bottom hole blowout control valve uses the design of binary channels and pressure difference sliding sleeve, has used Anti-erosion on rapidoprint
Material, while the surface treatment of tool is enhanced, so that the binary channels can cross the reversed bottom hole blowout control valve of ball-type different from open well
Bottom blowout prevention valve can adapt to the environment of coiled tubing pressing crack construction, while as a part of tubing string with tubing string lower going-into-well
It is interior, oil being closed in real time in shaft bottom and putting channel, well control risk caused by coiled tubing breakage is effectively reduced.
The working principle of bottom hole blowout control valve is as follows：
In operating conditions such as lower brill, hydraulic jet perforation and pressing crack construction operations, under head of liquid effect, steel ball 3.4 is seated
The upper end ball seat position in the one of channel of 3.3 binary channels of bushing, at this point, another channel still maintains unimpeded, at this point, shaft bottom
Positive fluid course is kept unimpeded inside blowout prevention valve, and bottom hole blowout control valve is in the unimpeded state of direct circulation, as shown in Figure 2；Continuous
During oil pipe pulls out of hole or adjusts drilling tool position, shaft bottom gushes on highly pressurised liquid in pipe and steel ball 3.4 is pushed to move up there are when high pressure,
It withstands under inner sliding sleeve 3.10 in end cone face, the flow channel of liquid from bottom to top is closed.It is cut at this point, bottom hole blowout control valve is in reversed
Only state, as shown in figure 3, steel ball 3.4 prevent shaft bottom highly pressurised liquid on gush, avoid the occurrence of coiled tubing rupture go out lubricator when
Blowout out of control phenomenon is caused to occur；When needing backwash operation, in such a way that pitching is suppressed, shear pin 3.8, interior cunning are cut
The sliding downwards under pressure of set 3.10, is located on the limited step inside top connection 3.11, meanwhile, in upper bushing 3.5
End face is provided with circlip 3.6, slide inner sliding sleeve 3.10 will not upwards again after stress, steel ball 3.4 is stuck under inner sliding sleeve 3.10
In space between end and neck bush 3.3, it is not readily accessible on the 3.10 lower end ball seat conical surface of inner sliding sleeve, as shown in figure 4, at this point,
The reversed fluid course of bottom hole blowout control valve is kept unimpeded, and reversed cutoff function releases.
Embodiment 2：
On the basis of embodiment 1, balanced valve is installed, in step 3, if due to continuous on coiled tubing bottom packer 5
There are pressure difference, coiled tubing bottom packers 5 normally to unseal for about 5 oil pipe bottom packer, then above mentions tool string and open balance
Valve, balanced valve are forced to gang up and balance the pressure difference of about 5 coiled tubing bottom packer.
When deblocking, if about 5 coiled tubing bottom packer, there are larger pressure difference, when upper lifting pipe post, can take the lead in mentioning out continuous oil
The balance valve system specially designed on tube bottom packer 5, forces the pressure for ganging up and balancing packer or more, and " negative pressure bit freezing " is existing
As that can't occur in the coiled tubing with interior blowout prevention function band underseal drag fracturing process pipe string application.
Embodiment 3：
On the basis of embodiment 1, as shown in Fig. 2 Fig. 3, it is recessed that annular is radially offered in the middle part of 3.10 outer wall of inner sliding sleeve
Slot 3.14, outer wall top extend outward to form protrusion 3.16, and 3.11 inner wall of top connection is equipped with limited step 3.15, top connection 3.11
Circlip 3.6 is equipped between 3.3 upper surface of lower end surface and bushing, as shown in figure 4, after cutting shear pin 3.8 in step 2, interior cunning
The sliding downwards under pressure of set 3.10, is located on the limited step 3.15 of top connection 3.11, circlip by protrusion 3.16
3.6 are caught in annular groove 3.14, slide inner sliding sleeve 3.10 will not upwards again after stress downslide.
Bottom hole blowout control valve, which realizes, to close the function that oil puts channel in real time in shaft bottom, effectively reduce coiled tubing breakage
Caused by well control risk.The bottom hole blowout control valve remains the simple and reliable structure design of spherically seated check valve, using binary channels knot
Structure design, allows pitching to pass through, have the function of it is positive it is unimpeded, reversely end, meanwhile, the structure of pressure difference sliding sleeve designs can be
Unidirectional valve action is released when needing, i.e., can also realize that reacting cycle is unimpeded when necessary.In addition, there is the position of sealing demand to be respectively provided with
Sealing structure uses high temperature high voltage resistant sealing ring as sealing element, enhances the heat resisting and pressure resisting performance of the ball-and-seat.By
In hydraulic jet perforation operating condition to the internal key part erosive wear resistance requirement such as ball-and-seat channel structure, bushing and inner sliding sleeve
Higher, key part is all made of high rigidity bearing steel and is process inside the ball-and-seat, ensure that good anti-erosion property, together
When, surface carburization processing is carried out to exterior parts such as ontology and top connections, further improving binary channels, can to cross ball-type reversed
The whole scour resistance of ball-and-seat, whole design overcome the deficiency of current existing well bottom blowout prevention valve technology, the company of meeting
The requirement of bottom hole blowout control technology in continuous oil pipe underseal dragging staged fracturing construction.
Embodiment 4：
On the basis of embodiment 1, the bushing 3.3 is from top to bottom by 3.2 groups of upper bushing 3.5, neck bush 3.17 and lower bushing
At the inner and outer wall of upper bushing 3.5 is arranged with multiple sealing rings, the outer wall of the outer wall of neck bush 3.17 and lower bushing 3.2
It is arranged multiple sealing rings.
In the present embodiment, there is the position of sealing demand to be provided with sealing structure, is using high temperature high voltage resistant sealing ring
As sealing element, the heat resisting and pressure resisting performance of bottom hole blowout control valve is enhanced.
Embodiment 5：
On the basis of embodiment 4, the inner wall of the neck bush 3.17 is equipped with step at installation ball seat 3.13, and step is close to upper
The diameter of 3.11 one end of connector is greater than the diameter close to 3.1 one end of lower contact.The partition 3.12 is set at installation ball seat 3.13
There is step, wall thickness of the step close to 3.11 one end of top connection is less than the wall thickness close to 3.1 one end of lower contact.
As shown in Figure 2, Figure 3 and Figure 4, when steel ball 3.4 is stuck in ball seat 3.13, due to the neck bush contacted with steel ball 3.4
3.17 are relatively large in diameter, partition 3.12 is relatively thin, and what steel ball 3.4 can be smooth is stuck in ball seat 3.13, neck bush 3.17 and partition
In 3.12 spaces formed, when reverse blocking state releases, it can be moved up by ball seat 3.13 rapidly.
Embodiment 6：
On the basis of embodiment 1, the inner sliding sleeve 3.10 is made of direct tube section and conical surface inner cavity section, in order in reversely cut-off shape
When state, prevent steel ball 3.4 from moving up, the diameter of direct tube section is less than the diameter of steel ball 3.4, and the diameter of conical surface inner cavity section is greater than steel ball
3.4 diameter.
Embodiment 7：
On the basis of embodiment 4, in order to reduce resistance, facilitates and move up into inner sliding sleeve 3.10 on steel ball 3.4, the upper bushing
3.5 lower parts are conical surface inner cavity, and the conical surface inner cavity of the conical surface inner cavity and 3.10 lower part of inner sliding sleeve is smoothly connected.
Further, the top connection 3.11 and lower contact 3.1 are connected by stopping screw 3.9, and stopping screw 3.9 is used for
Lower contact 3.1 and top connection 3.11 are prevented because pressure disconnects.
The present invention in the coiled tubing drag fracturing process pipe string with blowout prevention function on the basis of routine work tubing string,
Increase between injector and safety joint and devise shaft bottom open flow valve, when effectively preventing coiled tubing trip-out or adjustment position
The problem of well control risk caused by due to coiled tubing breakage.Bottom hole blowout control valve involved in its fracturing process uses binary channels
Structure design, have the function of it is positive it is unimpeded cross ball, reversed cut-off and can release when necessary reversely end, playing continuously
While oil pipe bottom hole blowout control acts on, well control risk is effectively reduced, shadow will not be caused to coiled tubing drag fracturing construction operation
It rings.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.The portion that the present embodiment does not describe in detail
The well-known components and common structure or conventional means of part and the structure category industry, do not describe one by one here.
Claims (9)
1. a kind of fracturing process of the coiled tubing with interior blowout prevention function, which is characterized in that using has interior blowout prevention function
Coiled tubing band underseal drag fracturing process pipe string, including the coiled tubing connection being sequentially connected in series on coiled tubing from top to bottom
Device（1）, safety joint（2）, bottom hole blowout control valve（3）, injector（4）, coiled tubing bottom packer（5）, casing collar locator (CCL)
（6）With righting head（7）, the bottom hole blowout control valve（3）Including top connection（3.11）And lower contact（3.1）, top connection（3.11）
Lower end have external screw thread, lower contact（3.1）Upper end have internal screw thread, internal and external threads be cooperatively connected, the top connection
（3.11）Inner cavity and lower contact（3.1）Inner cavity form the hollow cavity of connection, hollow cavity is built-in with inner sliding sleeve（3.10）
And bushing（3.3）, the inner sliding sleeve（3.10）Outer wall passes through shear pin（3.8）And clamp-screw（3.7）With top connection
（3.11）Tube wall connection, inner sliding sleeve（3.10）Lower end inner cavity be the conical surface, and inner sliding sleeve（3.10）Lower end outer wall and bushing
（3.3）The contact of upper end inner wall, bushing（3.3）Outer wall is close to lower contact（3.1）Inner wall, the bushing（3.3）Middle part is set along axial direction
There is partition（3.12）, partition（3.12）By bushing（3.3）Inner cavity installed along axially spaced formation binary channels, each channel
There is a ball seat（3.13）, the inner sliding sleeve（3.10）And bushing（3.3）It is made of high rigidity bearing steel, top connection（3.11）
And lower contact（3.1）Surface carburization processing is carried out；
It further include following steps：
Step 1, lower brill
Connecting, there is the coiled tubing band underseal drag fracturing process pipe string of interior blowout prevention function to form tool string, will be under the tool string
It bores, bottom hole blowout control valve is kept in going down process（3）Binary channels there is a channel to be in unimpeded state always, to tool string transfer
To predetermined position, pass through casing collar locator (CCL)（6）Adjust the position for determining fracturing technology tubing string；
Step 2, abrasive perforating and pressure break
Make coiled tubing bottom packer by lifting from the top and puting down tool string（5）It sets, then carries out hydraulic jet perforation and pressure break
Construction, if in the construction process, when sand plug occur and needing to carry out backwash operation, putting into steel ball into fracturing technology tubing string
（3.4）, steel ball（3.4）Cut shear pin（3.8）, inner sliding sleeve（3.10）Sliding downwards under pressure, steel ball（3.4）It sits
Ball seat in binary channels in one of channel（3.13）On, and it is stuck in inner sliding sleeve（3.10）Lower end and bushing（3.3）Between
Space in, another channel in binary channels is reversed fluid course, and reversed fluid course is kept unimpeded, and carries out backwash work
Industry；
Step 3, deblocking packer
After pressing crack construction, make coiled tubing bottom packer by above mentioning tool string（5）Deblocking；
Step 4 adjusts fracturing technology tubing string position
Coiled tubing bottom packer（5）Solution is honored as a queen, and casing collar locator (CCL) is passed through（6）It readjusts and determines fracturing technology tubing string position
It sets to next section and needs the interval of fracturing reform, when adjusting fracturing technology tubing string position, if there are high pressure, fracturing technologies in shaft bottom
Promotion steel ball is gushed in tubing string pipe on highly pressurised liquid（3.4）It moves up, steel ball（3.4）Withstand on inner sliding sleeve（3.10）In lower end cone face, liquid
The flow channel of body from bottom to top is closed, bottom hole blowout control valve（3）In reverse blocking state, prevent to gush on the highly pressurised liquid of shaft bottom,
Play the role of bottom hole blowout control；
Step 5 pulls out of hole
Step 1~step 4 is repeated, until coiled tubing bottom packer in fracturing technology tubing string（5）Or injector（4）Failure,
Pull out of hole replacement tool string, in trip-out process, if there are high pressures in shaft bottom, due to bottom hole blowout control valve（3）Still in reversed cut-off shape
State can still play the role of bottom hole blowout control.
2. the fracturing process of the coiled tubing with interior blowout prevention function as described in claim 1, it is characterised in that：It is described continuous
Oil pipe bottom packer（5）On balanced valve is installed, in step 3, if due to coiled tubing bottom packer（5）Up and down there are pressure difference,
Coiled tubing bottom packer（5）It can not normally unseal, then above mention tool string and open balanced valve, balanced valve pressure is ganged up and the company of balance
Continuous oil pipe bottom packer（5）Upper and lower pressure difference.
3. the fracturing process of the coiled tubing with interior blowout prevention function as described in claim 1, it is characterised in that：The interior cunning
Set（3.10）Annular groove is radially offered in the middle part of outer wall（3.14）, outer wall top extends outward to form protrusion（3.16）, on
Connector（3.11）Inner wall is equipped with limited step（3.15）, top connection（3.11）Lower end surface and bushing（3.3）It is equipped between upper surface
Circlip（3.6）, shear pin is cut in step 2（3.8）Afterwards, inner sliding sleeve（3.10）Sliding downwards under pressure, by convex
It rises（3.16）It is located at top connection（3.11）Limited step（3.15）On, circlip（3.6）It is caught in annular groove（3.14）It is interior, make
Inner sliding sleeve（3.10）It will not be slid upwards again after stress downslide.
4. the fracturing process of the coiled tubing with interior blowout prevention function as described in claim 1, it is characterised in that：The bushing
（3.3）From top to bottom by upper bushing（3.5）, neck bush（3.17）With lower bushing（3.2）Composition, upper bushing（3.5）Inner wall and
Outer wall is arranged with multiple sealing rings, neck bush（3.17）Outer wall and lower bushing（3.2）Outer wall be arranged multiple sealing rings.
5. the fracturing process of the coiled tubing with interior blowout prevention function as claimed in claim 4, it is characterised in that：The liner
Set（3.17）Inner wall installation ball seat（3.13）Place is equipped with step, and step is close to top connection（3.11）The diameter of one end, which is greater than, to be leaned on
Nearly lower contact（3.1）The diameter of one end.
6. the fracturing process of the coiled tubing with interior blowout prevention function as claimed in claim 5, it is characterised in that：The partition
（3.12）In installation ball seat（3.13）Place is equipped with step, and step is close to top connection（3.11）The wall thickness of one end is less than close to lower contact
（3.1）The wall thickness of one end.
7. the fracturing process of the coiled tubing with interior blowout prevention function as described in claim 1, it is characterised in that：The interior cunning
Set（3.10）It is made of direct tube section and conical surface inner cavity section, the diameter of direct tube section is less than steel ball（3.4）Diameter, the conical surface inner cavity section
Diameter is greater than steel ball（3.4）Diameter.
8. the fracturing process of the coiled tubing with interior blowout prevention function as claimed in claim 4, it is characterised in that：The upper lining
Set（3.5）Lower part is conical surface inner cavity, the conical surface inner cavity and inner sliding sleeve（3.10）The conical surface inner cavity of lower part is smoothly connected.
9. the fracturing process of the coiled tubing with interior blowout prevention function as described in claim 1, it is characterised in that：It is connect on described
Head（3.11）And lower contact（3.1）Pass through stopping screw（3.9）Connection.
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| CN201811019525.4A CN108915660B (en) | 2018-09-03 | 2018-09-03 | Fracturing method of coiled tubing with internal blowout prevention function |
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| CN201811019525.4A CN108915660B (en) | 2018-09-03 | 2018-09-03 | Fracturing method of coiled tubing with internal blowout prevention function |
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| CN111963134A (en) * | 2020-09-14 | 2020-11-20 | 中国石油集团渤海钻探工程有限公司 | Throttling-free multi-stage separate-layer fracturing pipe column and multi-stage separate-layer fracturing construction method |
| CN112160736A (en) * | 2020-09-14 | 2021-01-01 | 中国石油集团渤海钻探工程有限公司 | Non-throttling sand blasting sliding sleeve |
| CN113107436A (en) * | 2021-04-29 | 2021-07-13 | 南方海洋科学与工程广东省实验室(湛江) | Underground self-locking safety valve for deep-sea natural gas hydrate double-layer pipe exploitation |
| CN114961680A (en) * | 2022-04-07 | 2022-08-30 | 中煤科工集团重庆研究院有限公司 | Near-coal-seam roof directional perforation-fracturing integrated device and application method thereof |
| CN116335579A (en) * | 2023-05-26 | 2023-06-27 | 大庆辰平钻井技术服务有限公司 | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method |
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| CN113107436A (en) * | 2021-04-29 | 2021-07-13 | 南方海洋科学与工程广东省实验室(湛江) | Underground self-locking safety valve for deep-sea natural gas hydrate double-layer pipe exploitation |
| CN113107436B (en) * | 2021-04-29 | 2022-04-08 | 南方海洋科学与工程广东省实验室(湛江) | Underground self-locking safety valve for deep-sea natural gas hydrate double-layer pipe exploitation |
| CN114961680A (en) * | 2022-04-07 | 2022-08-30 | 中煤科工集团重庆研究院有限公司 | Near-coal-seam roof directional perforation-fracturing integrated device and application method thereof |
| CN114961680B (en) * | 2022-04-07 | 2023-10-20 | 中煤科工集团重庆研究院有限公司 | Near-coal-seam roof directional perforation-fracturing integrated device and use method thereof |
| CN116335579A (en) * | 2023-05-26 | 2023-06-27 | 大庆辰平钻井技术服务有限公司 | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method |
| CN116335579B (en) * | 2023-05-26 | 2023-08-11 | 大庆辰平钻井技术服务有限公司 | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method |
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