CN109707358A - Fracturing string and its fracturing process - Google Patents
Fracturing string and its fracturing process Download PDFInfo
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- CN109707358A CN109707358A CN201711008136.7A CN201711008136A CN109707358A CN 109707358 A CN109707358 A CN 109707358A CN 201711008136 A CN201711008136 A CN 201711008136A CN 109707358 A CN109707358 A CN 109707358A
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- fracturing
- sleeve
- string
- sliding bush
- pressure break
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- 229920001971 elastomer Polymers 0.000 claims description 14
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- 239000004568 cement Substances 0.000 claims description 11
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Earth Drilling (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of fracturing string and its fracturing process, fracturing string includes: casing string, the intelligent pitching fracturing sliding bush of more sets and pressure difference sliding sleeve；Casing string, You Duogen casing compose in series；It is cover intelligent pitching fracturing sliding bush more, at least a set of intelligent pitching fracturing sliding bush of concatenation is connected on the casing of each separate layer position；Pressure difference sliding sleeve is serially connected with described sleeve pipe column bottom layer position.
Description
Technical field
The present invention relates to a kind of fracturing string and fracturing process, specifically, more particularly to a kind of for petroleum gas
The fracturing string and fracturing process of the big orifice intelligence pitching of winning apparatus.
Background technique
During oil and gas exploitation, fracturing work is a kind of very effective method for increasing, and especially layering changes
The technology of making has become the important means of Low permeable oil and gas reservoirs volume increase, and sleeve type staged fracturing technology is unconventional oil and gas resource exploitation
Important means, be widely used in the fracturing yield increasing of shale gas, hyposmosis payzone, the straight well of oil sheet, directional well, horizontal well
Transformation.
Conventional sliding sleeve includes ball-throwing type sliding sleeve, fluid pressure type sliding sleeve and mechanical switch sliding sleeve.
Ball-throwing type sliding sleeve is usually used cooperatively with open hole packer, its working principle is that, in well head pitching, ball reaches sliding sleeve
Ball seat position and sliding sleeve tee, which are formed, to be sealed.When suppressing pressure and reaching setting value, pin is cut, sliding sleeve is mobile, exposes pressure break
Through-hole establishes pressure break channel.But since the size of sliding sleeves at different levels and ball is there are differential, pressure break series is restricted, and is pressed
After the completion of splitting, needs tripping in drilling tool to bore except sliding sleeve tee, increase duty cycle and operating cost.
Fluid pressure type sliding sleeve is commonly positioned at the most next stage of fracturing strings, its working principle is that, it has set all naked
After eye packer, continue to suppress.Sliding sleeve is opened after pressure reaches the cracking pressure of fluid pressure type sliding sleeve, is then carried out pressure break and is applied
Work.And fluid pressure type sliding sleeve can only be individually used for level-one, and need to match with ball-throwing type sliding sleeve and complete multistage fracturing.
Mechanical switch sliding sleeve needs switching tools with fracturing string together G.I.H, its main feature is that by switching tools into
Row opens and closes, and does not need to throw the ball that builds the pressure, therefore performance and stability requirement height to switching tools.
Therefore, it is badly in need of developing a kind of unrestricted fracturing string of pressure break reservoir digit and fracturing process.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of fracturing string, wherein includes:
Casing string, You Duogen casing compose in series；
Cover intelligent pitching fracturing sliding bush, each separate layer position is connected at least a set of intelligent pitching pressure break of concatenation more
Sliding sleeve；
Pressure difference sliding sleeve is serially connected with described sleeve pipe column bottom layer position
Above-mentioned fracturing string, wherein each intelligent pitching fracturing sliding bush includes sequentially connected top connection, connection
Set, sleeve body and lower contact, the top connection are attached to the bottom end of the described sleeve pipe in portion, and the lower contact is connected under it
The top of the described sleeve pipe in portion, each intelligent pitching fracturing sliding bush further include:
Fluid cylinder set is installed in the top connection；
Fluid cylinder is installed in the fluid cylinder set；
Elastomer is installed in the fluid cylinder；
Elastic sealing element is sheathed on the elastomer.
Above-mentioned fracturing string, wherein each intelligent pitching fracturing sliding bush further include:
Transition sleeve is set in the top connection, and one end of the transition sleeve is connected to the fluid cylinder；
Elastic component is sheathed on the transition sleeve, one end of the elastic component against the transition sleeve, the elastic component
The other end is against the connector sleeve.
Above-mentioned fracturing string, wherein each fracturing sliding bush further include:
Orbitron, part of it are located in the connector sleeve, and another part of the orbitron is located in the sleeve body,
One end of the orbitron is connected to the other end of the transition sleeve, wherein the fluid cylinder drives the elastomer, the transition
Set and the orbitron are axially movable；
Change is sheathed on the orbitron and between the connector sleeve and the sleeve body；
Guide pin penetrates the change and is connected on the orbitron.
Above-mentioned fracturing string, wherein each fracturing sliding bush further includes opening set, is installed in the sleeve body,
Described one end for opening set is interval in the orbitron.
Above-mentioned fracturing string, wherein the lower contact is connect with sleeve body, and the fracturing sliding bush further includes elastic packing
Seat, the elastic seal seat are installed between the opening set and the lower contact, and one end of the elastic seal seat is connected to
The lower contact, the opening set state elastic seal seat in rear enclosure residence axially movable.
Above-mentioned fracturing string, wherein along the circumferential direction offered on the outer wall of Yu Suoshu orbitron multiple long tracks and
Multiple short tracks, the long track are arranged alternately and are interconnected with the short track.
Above-mentioned fracturing string, wherein the other end of the elastic seal seat is provided with multiple claws.
Above-mentioned fracturing string, wherein be additionally provided with step limiting section on the inner wall of the sleeve body, the opening set against
The step limiting section setting.
Above-mentioned fracturing string, wherein each fracturing sliding bush further includes stop configurations, is installed in the sleeve body
On inner wall, set counter motion is opened described in backstop after elastic seal seat is stated in rear enclosure residence to opening set axially movable.
Above-mentioned fracturing string, wherein further include:
Multiple section packers are installed in correspondingly in the described sleeve pipe of each separate layer position；And
Guide shoe is connected to the fracturing string bottom.
Above-mentioned fracturing string, wherein further include:
Bruising pipe nipple, one end are connected to the pressure difference sliding sleeve；
Float collar, one end are connected to the lower end of the bruising pipe nipple；And
Float shoe, one end are connected to the lower end of the float collar.
The present invention provides a kind of fracturing process using the fracturing string described in any one of aforementioned, wherein further include with
Lower step:
After the quantity for determining fracturing sliding bush according to oil reservoir actual conditions, the fracturing string is assembled；
According to the instruction of fracturing string table, fracturing string described in tripping in is in place；
Pressure difference sliding sleeve is opened when being suppressed the fracturing string to a setting value, establishes fluid channel with reservoir；
After bottom pressure break, pressure break ball is successively put into, pressure break is carried out to remaining target reservoir.
Above-mentioned fracturing process, wherein further include:
The intelligent pitching fracturing sliding bush of each target reservoir corresponding at least one；
It is that n-th of pressure break ball is opened afterwards in place that each fracturing sliding bush, which is arranged, and n is positive integer；
When n-th of pressure break ball in place after, the pressure of pressure break ball bottom at least one fracturing sliding bush
It splits and forms sealing in sliding sleeve；
Hydraulic fracturing is carried out, the target reservoir is opened.
Above-mentioned fracturing process, wherein further include:
Well cementing operation separation layer position, fracturing string described in tripping in place after, connect cementing pipeline, inject cement, tripping in
Cementing plug replaces cement slurry, and after cementing plug, which runs to bruising pipe nipple, carries out bruising, replacement is finished, and carries out cement time and coagulates,
It completes well cementation separation layer position.
Above-mentioned fracturing process, wherein further include:
Layer separating packer layering, each layer of position be by section packers isolation two adjacent in described sleeve pipe and
At, fracturing string described in tripping in place after, the fracturing string is suppressed, each section packer is set, will need to press
The layer position of the target reservoir split separates.
The present invention is directed to the prior art its effect and is:
1, cased hole completion and barefoot completion are adapted to, is not limited by well type, it is adaptable, give engineer's more more options；
2, bridge plug technology ratio is bored with speed, without pump plug, perforation and bores plug, realizes efficient pressure break, reduce pressure break expense；
3, compared with conventional open hole packer combination sliding sleeve technology, guarantee pressure break efficiency simultaneously, latus rectum does not become smaller, and guarantees
The integrality of pit shaft, while theoretically pressure break series is unrestricted；
4, the counting of many grades can be set in intelligent ball count, engineer as needed, counts with level-one and uses one
Ball can disposably open one or more sliding sleeve, pressure break of freely arranging in pairs or groups as needed；
5, full-bore after pressing is conducive to the operations such as subsequent production, well workover, secondary fracturing, extends the individual well service life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of fracturing string first embodiment of the present invention；
Fig. 2 is the structural schematic diagram of this practical fracturing sliding bush；
Fig. 3 is the partial enlarged view of A in Fig. 2；
Fig. 4 is the partial enlarged view of B in Fig. 2；
Fig. 5 is the status diagram that set is opened when not working in Fig. 2；
Fig. 6 is that pressure break ball passes through the status diagram of opening set when working in Fig. 2；
Fig. 7 is the anti-status diagram that set is opened when arranging in Fig. 2；
Fig. 8 is the structural schematic diagram of fracturing string second embodiment of the present invention；
Fig. 9 is the flow chart of fracturing process first embodiment of the present invention；
Figure 10 is the flow chart step by step of step S4 in Fig. 9；
Figure 11 is the flow chart of fracturing process second embodiment of the present invention.
Specific embodiment
Hereby detailed content and technology for the present invention explanation is now described further with a preferred embodiment, but not
It should be interpreted the limitation of implementation of the invention.
Fig. 1-4 is please referred to, Fig. 1 is the structural schematic diagram of fracturing string first embodiment of the present invention；Fig. 2 is this practical pressure break
The structural schematic diagram of sliding sleeve；Fig. 3 is the partial enlarged view of A in Fig. 1；Fig. 4 is the partial enlarged view of B in Fig. 2.As shown in Figs 1-4,
Fracturing string of the invention includes casing string, multiple intelligence pitching fracturing sliding bush Y and pressure difference sliding sleeve C；Casing string is covered by more
Pipe M is composed in series；At least a set of intelligent pitching fracturing sliding bush Y of concatenation is connected between the casing M of each separate layer position G；Pressure difference
Sliding sleeve C is serially connected with the layer position of the bottom casing M.
Fracturing sliding bush of the present invention includes sequentially connected top connection 1, connector sleeve 9, sleeve body 10 and lower contact 15, and pressure break is sliding
Set further include: fluid cylinder set 2, fluid cylinder 3, elastic sealing element 4 and elastomer 5；Top connection 1 is attached to the lower end of the casing M in portion,
Lower contact 15 is connected to the upper end of the casing string M of its underpart, and each intelligence pitching fracturing sliding bush further includes；Fluid cylinder set 2 is installed in
In top connection 1；Fluid cylinder 3 is installed in fluid cylinder set 2；Elastomer 5 is installed in fluid cylinder 3；Elastic sealing element 4 is sheathed on elastomer 5
On.Wherein, in the present embodiment, elastomer 5 is metal elastomer, but the present invention is not limited thereto.
Further, intelligent pitching fracturing sliding bush further include: transition sleeve 6 and elastic component 7；Transition sleeve 6 is set to top connection 1
Interior, one end of transition sleeve 6 is connected to fluid cylinder 3；Elastic component 7 is sheathed on transition sleeve 6, one end of elastic component 7 against transition sleeve 6,
The other end of elastic component 7 is connected set 9, wherein take spring as preferable embodiment of elastic component, but the present invention not with
This is limited.
Still further, intelligent pitching fracturing sliding bush further include: orbitron 8, change 11 and guide pin 12；Orbitron 8
A part be located in connector sleeve 9, another part of orbitron 8 is located in sleeve body 10, and one end of orbitron 8 is connected to transition
The other end of set 6, ball in place hydraulic-driven fluid cylinder 3 after elastomer 5, axially simultaneously move to transition sleeve 6 and orbitron 8；
Change 11 is sheathed on orbitron 8 and between connector sleeve 9 and sleeve body 10；Guide pin 12 penetrates change 11 and is connected to rail
Deferent 8.Wherein, in along the circumferential direction offering multiple long track C1 and multiple short track C2, long track on the outer wall of orbitron 8
C1 is arranged alternately and is interconnected with short track C2.
Further, intelligent pitching fracturing sliding bush further includes opening set 13, elastic seal seat 14 and stop configurations 16, dress
In sleeve body 10, the one end for opening set 13 is interval in the other end of orbitron 8；Lower contact 15 is connected with sleeve body 10, bullet
Property seal receptacle 14 be installed in opening set 13 and lower contact 15 between, one end of elastic seal seat 14 is connected to lower contact 15, open
Set 13 can entangle elastic seal seat 14 axially movable；The other end of elastic seal seat 14 is provided with multiple claws 141, opens
Set 13 is fastened on multiple claws 141；It is equipped with step limiting section 101 on the inner wall of sleeve body 10, opens set 13 and is limited against step
Position portion 101 is arranged；Stop configurations 16 are installed on the inner wall of sleeve body 10, and it is close to entangle elasticity after opening set 13 axially movable
It seals after seat 14 and opens the counter motion of set 13 with backstop.
In the present embodiment, fluid cylinder 3, elastic sealing element 4 and elastomer 5 constitute soft seal holder assembly；Soft seal holder assembly,
Elastic component 7, orbitron 8 (the outer long track C1 and short track C2 for having connection of pipe), change 11 and guide pin 12 constitute intelligent meter
Number mechanism；It opens set 13 and elastic seal seat 14 constitutes slider mechanism；Pressure break ball reaches the formation of soft seal holder assembly and faces after pitching
When piston transfer force to orbitron 8 under pressure, orbitron 8 moves once on short track C2, orbitron 8 drive
Guide pin 12, guide pin 12 drive change 11 to rotate, and then elastic component 7 drives soft seal holder assembly to reset.Every investment one
A pressure break ball just rotates once, and when turning to specified position, orbitron 8 enters long track C1, and orbitron 8 transmits power
It onto slider mechanism, pushes and opens set 13, will be moved on elastic seal seat 14 after opening 13 downlinks of set, force elastic seal seat
It shrinks internal diameter to become smaller, pressure break ball is located to be sealed here, can carry out fracturing work at this time.If this layer of position is adjacent
Multiple layers of position need a pitching to open multiple sliding sleeves, in this layer of position or multiple layers of adjacent position inside the multiple sliding sleeves in front
Uneasiness dress elastic seal seat, only installs elastic seal seat on the last one sliding sleeve, and ball with smooth opening sliding sleeve and can be located at
On the last one sliding sleeve, fracturing work is carried out, one or more layer of position can be pressed off.Thus since sliding sleeve can be set in total
At opening after investment n-th ball, and the mountable multiple sliding sleeves of every level-one are opened simultaneously, thus fracturing sliding bush of the invention not by
The limitation of the fractured layer position number of plies；Simultaneously because sliding sleeve is opened by Intelligent-counting, because the internal diameter of each sliding sleeve can be identical, because
This makes sliding sleeve that can retain maximum latus rectum, does not influence later period operation.
Further, fracturing string further include: multiple section packers 17 and guide shoe 18；Multiple section packers 17 1
On the one corresponding casing M for being installed in each separate layer position G, each separate layer position G is by two segmentations adjacent on casing M
Packer 17 is isolated；Guide shoe 18 is connected to pressure difference sliding sleeve C.
Referring to figure 5. -7, Fig. 5 is the status diagram that set is opened when not working in Fig. 2；Fig. 6 is pressure break when working in Fig. 2
Ball is by opening the status diagram covered；Fig. 7 is the state signal for the opening set that anti-ball when arranging moves to upper level sliding sleeve in Fig. 8
Figure, the course of work of fracturing string and fracturing sliding bush of the present invention is illustrated below in conjunction with Fig. 1-7.It should be noted that retouching below
The specific value the stated course of work of the invention by way of example only, the present invention is not limited thereto.
According to oil reservoir actual conditions and FRACTURING DESIGN, determine the fracturing sliding bush Y on fracturing string position and quantity and
The position of pressure difference sliding sleeve C and quantity, according to fracturing string table, tripping in fracturing string is in place.In the fracturing string, pressure difference sliding sleeve
C is mounted in the sliding sleeve of lowermost end, by suppressing setting value to fracturing string, applies to open pressure difference sliding sleeve C and carry out pressure break
Work, pressure difference sliding sleeve C are to establish fluid channel for opening reservoir.Intelligent pitching fracturing sliding bush Y is after sliding sleeve is opened in pitching
Carry out fracturing work.Since section packer 17 is arranged thus may not need carry out well cementing operation.
Fracturing work is carried out according to FRACTURING DESIGN, fracturing string is suppressed first, sets each segmentation of entire fracturing string
Packer 17 separates the layer position for needing pressure break.After the completion of section packer 17 is set, continue to increase pressure, opening is
The pressure difference sliding sleeve C of bottommost carries out bottom fracturing work, establishes fluid channel.Then throw pressure break ball again, due to storage
Layer establishes runner, therefore can pump pressure break ball in place in horizontal well operations.Pressure break ball is every by an intelligent pitching pressure break
Sliding sleeve Y, fracturing sliding bush Y are counted.When intelligent pitching fracturing sliding bush Y setting n-th ball in place after, the intelligence pitching pressure break
Sliding sleeve Y is opened, and ball will not be by the sliding sleeve, and sealing, Ke Yijin are formed on the ball seat in intelligence pitching fracturing sliding bush Y
Row hydraulic fracturing job, pressure break ball rest on the seal receptacle of intelligence pitching fracturing sliding bush Y.If some layer of position is adjacent
Multiple layers of position be corresponding with after X intelligence pitching fracturing sliding bush Y be arranged at n-th pressure break ball in place, pressure break ball can pass through
Whole fracturing sliding bush Y of front, and sealing is formed on the intelligent pitching fracturing sliding bush Y of lowermost end, it, should when carrying out hydraulic fracturing
X sliding sleeve on layer position or multiple layers of adjacent position is pressed off by waterpower, and pressure break ball rests on the intelligence of this layer of position lowermost end always
On energy pitching fracturing sliding bush Y.It is required according to FRACTURING DESIGN, carries out the fracturing work of other layers of position.Due to each intelligent pitching
Fracturing sliding bush Y may be designed to by opening after n-th ball, and can open X sliding sleeve each time, and therefore, intelligence is thrown
The number of ball fracturing sliding bush Y can fully meet the requirement of entire fracturing string design, not by fracturing string size and length
Limitation, and maximum latus rectum is kept, later period operation is not influenced.
Wherein the specific work process of intelligent pitching fracturing sliding bush Y is as follows:
110 millimeters of fracturing sliding bush smallest passage flexibility internal diameter when not pitching, 118 millimeters of rigid internal diameter.It is put into when work low
Pressure break ball, when pressure break ball is reached at 110 millimeters of soft seal ring internal diameter, pressure break ball is temporarily blocked by metal elastomer 5, is built the pressure, rail
Deferent 8 moves under the action of metal elastomer 5 and fluid cylinder 3.When pressure difference is more than 3MPa, pressure break ball passes through metal elastomer 5, and
And pass through elastic seal seat 14.Orbitron 8 returns to counting position under the action of the spring.When pressure break ball n-th pitching builds the pressure,
Intelligent counter (not shown) reaches setting value, the long track of several guide pins 12 while injection pipe 8, so that orbitron
8 can move relatively long distance to push opening set 13 to move down, and pressure break hole is opened.It opens 13 lower ends of set and entangles elastic seal seat
14, force the elasticity for making elastic seal seat 14 to grab contraction in rigidity, when pressure difference is more than 3MPa, pressure break ball passes through metal elastomer
5, it falls on elastic seal seat 14, pressure break ball is sealed with elastic seal seat 14.The cunning of same counting can be opened by this time building the pressure
Covering one or more, (multiple sliding sleeves are respectively provided with by opening after N ball, in addition to the last one sliding sleeve is mounted with hard seal receptacle 14
Outside, several sliding sleeves are fitted without elastic seal seat 14 before, do not influence opening set 13 and are opened, ball is passed through and is located at most
On the sliding sleeve of lower end), stratum is suppressed out, pressure break ball is opened set 13 and located always under differential pressure action when elastic seal seat 14 builds the pressure
In low level.When all laminations are split and finished, well head bleeds off pressure that stratum is counter to arrange, and ball moves under the elastic seal seat 14 of a sliding sleeve
Side, after opening set 13 moves up a distance under suppressing action, 16 backstop of stop mechanism opens set 13, elastic seal seat (14)
It opens, pressure break ball upwardly through elastic seal seat 14 and metal elastomer 5, be caught the capture of ball device (not shown) by the anti-well head that is discharged to.
Wherein, pressure break ball reaches the flexible inner radius of metal elastomer 5, and pressure break ball is temporarily blocked, in the upper end of pressure break ball
When applying certain pressure, pressure break ball can pass through metal elastomer 5.It therefore can be close by adjusting metal elastomer 5 and elasticity
Sealing 4 passes through the pressure of metal elastomer 5 to change ball.Pressure break ball reaches the flexible inner radius of metal elastomer 5, arrives pressure break ball
Before metal elastomer 5, metal elastomer 5 and elastic sealing element 4 and pressure break ball form interim piston, and fluid cylinder 3 can when building the pressure
To provide axial thrust, but after pressure break ball passes through, piston effect disappears.
Along the circumferential direction offered on the outer wall of orbitron 8 multiple long track C1 and multiple short track C2, long track C1 with
Short track C2 is arranged alternately and is interconnected, multiple long track C1, multiple short track C2, change 11 and guide pin 12, jointly
Counter is formed, wherein change 11 and guide pin 12 work on the slot of orbitron 8, and it is N number of to set counter before going into the well
Ball seat is opened after ball.Work ball reaches metal elastomer 5 and builds the pressure, and interim piston provides axial thrust, when orbitron 8 is axially moved
Under the action of guide pin 12 and change 11, change 11 is forced to turn over certain angle.The thrust that interim piston provides is by short rail
C2 limitation in road can not act directly on opening set 13, and opening set 13 can not open.After pressure break ball passes through metal elastomer 5, liquid
The axial thrust that cylinder 3 provides disappears, and orbitron 8 returns to Counts position under the action of spring 7.After putting into N number of ball, work as counting
When device goes back to No. 0 position, in long track C1, the thrust that fluid cylinder 3 provides can be applied on opening set 13 interim pistons work, be opened
Set 13 is opened.
Fig. 8 is please referred to, Fig. 8 is the structural schematic diagram of fracturing string second embodiment of the present invention.As shown in figure 8, pressure break pipe
Column includes casing string, multiple intelligence pitching fracturing sliding bush Y and pressure difference sliding sleeve C；Casing string is composed in series by more casing M；Often
The one layer position separated is respectively connected at least one intelligent pitching fracturing sliding bush Y of concatenation；Pressure difference sliding sleeve C is serially connected with casing string most bottom
The layer position at end；Unlike Fig. 1, fracturing string is due to being not provided with section packer 17 and guide shoe 18 in the present embodiment, thus
Increase bruising pipe nipple 19, float collar 20 and float shoe 21；One end of bruising pipe nipple 19 is connected to pressure difference sliding sleeve C；One end of float collar 20
It is connected to the other end of bruising pipe nipple 19；One end of float shoe 21 is connected to the other end of float collar 20.According to the structure of the present embodiment,
Well cementation stratified operation is carried out after tripping in fracturing string, connects cementing pipeline, injects cement 22, and tripping in cementing plug replaces water
Mud 22, after cementing plug, which runs to bruising pipe nipple 19, carries out bruising, replacement is finished, and is carried out the time of cement 22 and is coagulated, well cementation layering is made
Industry is completed.Remaining course of work of the present embodiment is identical as the course of work of Fig. 1, and details are not described herein again.
Fig. 9-10 is please referred to, Fig. 9 is the flow chart of fracturing process first embodiment of the present invention；Figure 10 is step S5 in Fig. 9
Flow chart step by step.As shown in figs. 9-10, fracturing process of the present invention includes:
S1: after determining that well needs the layer position of pressure break and the quantity of fracturing sliding bush according to oil reservoir actual conditions, pressure break pipe is assembled
Column；
S2: according to the instruction of fracturing string table, tripping in fracturing string is in place；
S3: after tripping in place, suppressing fracturing string, sets each section packer, will need the target reservoir of pressure break
Layer position separate, complete zone isolation；
S4: pressure difference sliding sleeve is opened when being suppressed fracturing string to a setting value, establishes fluid channel with reservoir；
S5: bottom pressure break finishes successively investment pressure break ball, carries out pressure break to remaining target reservoir.
Further, step S5 also includes:
S51: the intelligent pitching fracturing sliding bush of each target reservoir corresponding at least one；
S52: each intelligent pitching fracturing sliding bush of setting is that n-th of pressure break ball is opened afterwards in place, and n is positive whole
Number；
S53: when n-th of pressure break ball in place after, the pressure break ball in at least one intelligent pitching fracturing sliding bush most
Sealing is formed in the fracturing sliding bush of bottom；
S54: hydraulic fracturing is carried out, the target reservoir is opened.
Figure 11 is please referred to, Figure 11 is the flow chart of fracturing process second embodiment of the present invention.As shown in figure 11, pressure of the present invention
Cracking method includes:
S1 ': after determining that well needs the layer position of pressure break and the quantity of fracturing sliding bush according to oil reservoir actual conditions, pressure break pipe is assembled
Column；
S2 ': according to the instruction of fracturing string table, fracturing string described in tripping in is in place；
S3 ': after tripping in place, connecting cementing pipeline, injects cement, and tripping in cementing plug replaces cement slurry, works as well cementation
After rubber plug runs to the progress bruising of bruising pipe nipple, replacement is finished, and is carried out cement time and is coagulated, and interlayer is completed in well cementing operation layering completion
Isolation；
S4 ': opening pressure difference sliding sleeve when being suppressed the fracturing string to a setting value, it is logical to establish fluid with reservoir
Road；
S5 ': bottom pressure break finishes successively investment pressure break ball, carries out pressure break to remaining target reservoir.Wherein step S5 '
Identical as aforementioned step S5, details are not described herein again.
It is worth noting that, in the present embodiment due to can be omitted setting by the way of well cementing operation layering
Section packer.
In conclusion the invention has the following advantages that
1, cased hole completion and barefoot completion are adapted to, is not limited by well type, it is adaptable, give engineer's more more options；
2, bridge plug technology ratio is bored with speed, without pump plug, perforation and bores plug, realizes efficient pressure break, reduce pressure break expense；
3, compared with conventional open hole packer combination sliding sleeve technology, guarantee pressure break efficiency simultaneously, latus rectum does not become smaller, and guarantees
The integrality of pit shaft, concurrent fracturing series are unrestricted；
4, the counting of many grades can be set in intelligent ball count, engineer as needed, counts with level-one and uses one
Ball can disposably open one or more sliding sleeve, pressure break of freely arranging in pairs or groups as needed；
5, full-bore after pressing is conducive to the operations such as subsequent production, well workover, secondary fracturing, extends the individual well service life.
It above are only present pre-ferred embodiments, be not used to limit the scope of implementation of the present invention, without departing substantially from this
In the case where spirit and its essence, those skilled in the art make various corresponding changes in accordance with the present invention
And deformation, but these corresponding changes and modifications all should fall within the scope of protection of the appended claims of the present invention.
Claims (16)
1. a kind of fracturing string characterized by comprising
Casing string, You Duogen casing compose in series；
It is cover intelligent pitching fracturing sliding bush more, at least a set of intelligent pitching of concatenation is connected on the casing of each separate layer position
Fracturing sliding bush；
Pressure difference sliding sleeve is serially connected with described sleeve pipe column bottom layer position.
2. fracturing string as described in claim 1, which is characterized in that each intelligent pitching fracturing sliding bush includes successively connecting
Top connection, connector sleeve, sleeve body and the lower contact connect, the top connection is attached to the bottom end of the described sleeve pipe in portion, described
Lower contact is connected to the top of the described sleeve pipe of its underpart, each intelligent pitching fracturing sliding bush further include:
Fluid cylinder set is installed in the top connection；
Fluid cylinder is installed in the fluid cylinder set；
Elastomer is installed in the fluid cylinder；
Elastic sealing element is sheathed on the elastomer.
3. fracturing string as claimed in claim 2, which is characterized in that each intelligent pitching fracturing sliding bush further include:
Transition sleeve is set in the top connection, and one end of the transition sleeve is connected to the fluid cylinder；
Elastic component is sheathed on the transition sleeve, one end of the elastic component against the transition sleeve, the elastic component it is another
End is against the connector sleeve.
4. fracturing string as claimed in claim 3, which is characterized in that each intelligent pitching fracturing sliding bush further include:
Orbitron, part of it are located in the connector sleeve, and another part of the orbitron is located in the sleeve body, described
One end of orbitron is connected to the other end of the transition sleeve, wherein the fluid cylinder drive the elastomer, the transition sleeve and
The orbitron is axially movable；
Change is sheathed on the orbitron and between the connector sleeve and the sleeve body；
Guide pin penetrates the change and is connected on the orbitron.
5. fracturing string as claimed in claim 4, which is characterized in that each fracturing sliding bush further includes opening set, installing
In in the sleeve body, described one end for opening set is interval in the orbitron.
6. fracturing string as claimed in claim 5, which is characterized in that the lower contact is connect with sleeve body, and the pressure break is sliding
Set further includes elastic seal seat, and the elastic seal seat is installed between the opening set and the lower contact, and the elasticity is close
One end of envelope seat is connected to the lower contact, and the opening set states elastic seal seat in rear enclosure residence axially movable.
7. fracturing string as claimed in claim 4, which is characterized in that along the circumferential direction opened up on the outer wall of Yu Suoshu orbitron
There are multiple long tracks and multiple short tracks, the long track is arranged alternately and is interconnected with the short track.
8. fracturing string as claimed in claim 6, which is characterized in that the other end of the elastic seal seat is provided with multiple cards
Pawl.
9. fracturing string as claimed in claim 6, which is characterized in that be additionally provided with step limit on the inner wall of the sleeve body
Portion, the opening set are arranged against the step limiting section.
10. fracturing string as described in claim 6, which is characterized in that each fracturing sliding bush further includes stop configurations,
It is installed on the inner wall of the sleeve body, after elastic seal seat is stated in rear enclosure residence to opening set axially movable described in backstop
Open set counter motion.
11. fracturing string as described in claim 1, which is characterized in that further include:
Multiple section packers are installed in correspondingly in the described sleeve pipe of each separate layer position；And
Guide shoe is connected to the fracturing string bottom.
12. fracturing string as described in claim 1, which is characterized in that further include:
Bruising pipe nipple, one end are connected to the pressure difference sliding sleeve；
Float collar, one end are connected to the lower end of the bruising pipe nipple；And
Float shoe, one end are connected to the lower end of the float collar.
13. a kind of fracturing process using fracturing string described in any one of the claims 1-13, which is characterized in that also
The following steps are included:
After the quantity for determining fracturing sliding bush according to oil reservoir actual conditions, the fracturing string is assembled；
According to the instruction of fracturing string table, fracturing string described in tripping in is in place；
Pressure difference sliding sleeve is opened when being suppressed the fracturing string to a setting value, establishes fluid channel with reservoir；
Bottom pressure break finishes successively investment pressure break ball, carries out pressure break to remaining target reservoir.
14. fracturing process as claimed in claim 13, which is characterized in that further include:
The intelligent pitching fracturing sliding bush of each target reservoir corresponding at least one；
It is that n-th of pressure break ball is opened afterwards in place that each intelligent pitching fracturing sliding bush, which is arranged, and n is positive integer；
When n-th of pressure break ball in place after, the institute of pressure break ball bottom in at least one intelligent pitching fracturing sliding bush
It states and forms sealing in fracturing sliding bush；
Hydraulic fracturing is carried out, the target reservoir is opened.
15. fracturing process as claimed in claim 14, which is characterized in that further include:
Well cementing operation separation layer position, fracturing string described in tripping in place after, connect cementing pipeline, inject cement, tripping in well cementation
Rubber plug replaces cement slurry, and after cementing plug, which runs to bruising pipe nipple, carries out bruising, replacement is finished, and carries out cement and waits solidifying, well cementation
Isolation layering is completed.
16. fracturing process as claimed in claim 14, which is characterized in that further include:
Layer separating packer layering, each layer of position is isolated by two section packers adjacent in described sleeve pipe,
Fracturing string described in tripping in place after, the fracturing string is suppressed, each section packer is set, pressure break will be needed
The layer position of the target reservoir separates.
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| CN201711008136.7A CN109707358B (en) | 2017-10-25 | 2017-10-25 | Fracturing string and fracturing method thereof |
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| CN201711008136.7A CN109707358B (en) | 2017-10-25 | 2017-10-25 | Fracturing string and fracturing method thereof |
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Cited By (4)
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| CN112780221A (en) * | 2021-03-03 | 2021-05-11 | 东营市友佳石油科技有限公司 | Pollution-free perforation-free well cementation tool device and method for reservoir |
| CN113123728A (en) * | 2019-12-30 | 2021-07-16 | 中国石油天然气集团有限公司 | Sleeve, sleeve assembly and assembling method thereof |
| CN113494264A (en) * | 2021-07-09 | 2021-10-12 | 中煤科工集团西安研究院有限公司 | Water-resisting layer reinforced grouting transformation device and method based on staged fracturing |
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