CN106761643A - A kind of system and method for the continuous back-up sand separate stratum fracfturing of achievable water-jet - Google Patents
A kind of system and method for the continuous back-up sand separate stratum fracfturing of achievable water-jet Download PDFInfo
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- CN106761643A CN106761643A CN201611217342.4A CN201611217342A CN106761643A CN 106761643 A CN106761643 A CN 106761643A CN 201611217342 A CN201611217342 A CN 201611217342A CN 106761643 A CN106761643 A CN 106761643A
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- 239000004576 sand Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000011010 flushing procedure Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 28
- 210000002445 nipple Anatomy 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- 238000005406 washing Methods 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 11
- 238000012856 packing Methods 0.000 abstract description 4
- 206010010214 Compression fracture Diseases 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation 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
- 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
- E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to oil field compression fracture technical field, more particularly to a kind of system and method for the continuous back-up sand separate stratum fracfturing of achievable water-jet, the system includes underground process pipe string, it is connected to the well head continuous sand flushing device of the underground process pipe string upper end, after the method lives in the injection of row perforation and continuous back-up sand by underground process duct, sand washing is carried out by well head continuous sand flushing device again, insulated by back-up sand and replace underseal to insulate, avoid the damage of tubing string bottom packer, packing reliability is ensure that, tubing string construction hop count and construction safety is improve.
Description
Technical field
The present invention relates to oil field compression fracture technical field, more particularly to a kind of continuous back-up sand separate stratum fracfturing of achievable water-jet
System and method, the apparatus and method be applied to straight well, directional well, horizontal well layering section fracturing reform.
Background technology
The process pipe string that hydraulic jet perforation generally uses injector plus bottom packer with fracturing integrated tubing string is dragged
Dynamic to realize multistage pressure break, the influence of the layer anisotropism that the process pipe string can be eliminated, packing is more reliable, therefore application is more
Extensively.
, it is necessary to implement the transformation of huge discharge volume fracturing for compact oil reservoir, to form the chicken-wire cracking of complexity, increase
Drainage area, reaches the purpose for increasing production and improying productivity, and attempts adding the underseal to carry out compact oil reservoir body every process pipe string using injector at present
Product fracturing reform, but on the one hand under huge discharge, the process pipe string is wriggled seriously, causes bottom packer midway to damage, it is impossible to
It is reliable to insulate reservoir, it is necessary to frequently change tubing string, on the other hand because the technique adds sand larger, cause packer sand occur
Card phenomenon, so not only extends construction period, and increased construction risk.So using for reference coiled tubing back-up sand layering work
Skill, it is proposed that insulate mode instead of underseal with back-up sand layered mode, but because conventional hydraulic jetting fracturing tubing string does not possess
Sand washing function, in fracturing process and after pressure break is finished when needing sand washing operation, in addition it is also necessary under enter a sand-flushing pipe column, operational procedure
Many, the cycle is long, it is necessary to explore highly efficient hydro-jet fracturing technology tubing string.
The content of the invention
In order to overcome existing hydraulic jetting fracturing to keep a grip on not to possess sand washing function, it is necessary under enter a sand washing and keep a grip on not
Foot, the system and method it is an object of the invention to propose a kind of continuous back-up sand separate stratum fracfturing of achievable water-jet.
To realize above-mentioned technical purpose, the present invention is adopted the following technical scheme that and is achieved.
A kind of system of the continuous back-up sand separate stratum fracfturing of achievable water-jet, the system includes underground process pipe string, connection
In the well head continuous sand flushing device of the underground process pipe string upper end.
Preferably, the well head continuous sand flushing device includes a ring valve main body；The ring valve main body two ends connect one respectively
Top sub and a bottom pipe nipple；A central tube is connected between the ring valve main body internal upper part pipe nipple and bottom pipe nipple；In described
The upper end of heart pipe is provided with a plug；Form annular space between the central tube and the ring valve main body, the top sub with
The annular space connects to form fluid course, is slided in the annular space and is provided with a piston, the closure of the piston activity
The fluid course；The top of the central tube is provided with the heart tube side hole communicated with the annular space；In the ring valve main body
It is provided with the ring valve side opening communicated with the annular space；Be arranged a main body set outside the ring valve main body, the main body be arranged with
The main body side opening that the ring valve side opening is communicated.
Preferably, the main body side opening external side connector, oily nonyl, lower high-pressure fire hose, the first reversing control valve successively, the
One reversing control valve connects cement pump truck by pipeline.
Preferably, the top and bottom of the main body set connect upper flange and lower flange respectively；The upper flange is sheathed on
On the top sub, the upper end of the top sub connects a top connection.
Preferably, the upper end of the top connection is sequentially connected high-pressure fire hose, the second reversing control valve；Described second changes
The cement pump truck is connected to control valve.
Preferably, it is provided with cartridge between the upper flange and main body set.
Preferably, an elevator is arranged outside the top sub, the elevator is located at the upper end of the upper flange.
Preferably, the underground process pipe string includes sleeve pipe, is arranged in the oil pipe in sleeve pipe, and oil pipe lower end is connected with safety
Give up, the lower end given up in safety is connected with injector by pipeline, guiding check valve is connected in injector lower end；The oil pipe
Connect the lower flange.
Another object of the present invention, a kind of method of the achievable continuous back-up sand separate stratum fracfturing of water-jet, including following step
Suddenly：
Process pipe string under step 1, lower going-into-well, the first fragment position that injector alignment need to be transformed；
Step 2, from oil pipe with 0.5m3/ min injects perforating fluid, carries out coiled tubing hydraulic perforating；When load fluid to nozzle
9 apart from 200m when, improve discharge capacity to 2.0m3/ min carries out abrasive perforating, and during perforation, perforating fluid injects from coiled tubing, oil pipe
Annular space with sleeve pipe is returned out；
After the completion of step 3, perforation, the annular space injection fracturing fluid of oil pipe and sleeve pipe, while oil pipe keeps the base of 0.2m3/min
Liquid discharge capacity；
After the complete first paragraph of step 4, pressure break, calculated since main pressure break latter end, phase is replaced by the annular space of oil pipe and sleeve pipe
Sand amount is answered, after settling 1 hour, sand face is visited with underground process pipe string, back-up sand again or replacing well head are carried out according to sand result is visited
Continuous sand flushing device；
Step 5, repeat step 1-4 complete remaining each section of pressure break.
Step 6, dismounting fracture well head, are replaced by well head continuous sand flushing device, are gone out sand grains using the direct circulation of this tubing string
Pit shaft.
Beneficial effects of the present invention：
1st, the system underground process pipe string coordinates well head continuous sand flushing device, it is not necessary to specially descend sand-flushing pipe column, one time again
Tubing string is realized carrying out perforation, pressure break and sand washing to oil-gas Layer, and efficiency of construction is high.
2nd, in pressing crack construction, insulated by back-up sand and replace underseal to insulate, it is to avoid the damage of tubing string bottom packer, it is ensured that
Packing reliability, improves tubing string construction hop count and construction safety.
Brief description of the drawings
A kind of Fig. 1 structural representations of the system of the achievable continuous back-up sand separate stratum fracfturing of water-jet of the invention
In figure：1- top connections；2- elevators；3- top subs；4- upper flanges；5- cartridges；6- plugs；7- ring valve masters
Body；8- pistons；9- central tubes；10- main body sets；11- lower flanges；12- bottoms pipe nipple；13- side connectors；14- unions；15；Upper height
Pressure rotary hose；High-pressure fire hose under 16-；The reversing control valves of 17- first；The reversing control valves of 18- second；19- oil pipes；20- safety
Give up；21- injectors；22- guiding check valves；23- sleeve pipes.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings：
Embodiment 1
As shown in figure 1, a kind of system of achievable continuous back-up sand separate stratum fracfturing of water-jet provided in an embodiment of the present invention,
The system includes underground process pipe string, is connected to the well head continuous sand flushing device of the underground process pipe string upper end.
Operation principle of the invention is：By connecting a well head continuous sand flushing device on the process pipe string of underground, by underground
After process duct lives in the injection of row perforation and continuous back-up sand, then sand washing is carried out by well head continuous sand flushing device, generation is insulated by back-up sand
Insulated for underseal, it is to avoid the damage of tubing string bottom packer, it is ensured that packing reliability, improve tubing string construction hop count and construction
Safety.
Embodiment 2
On the basis of embodiment 1, as shown in figure 1, the well head continuous sand flushing device includes a ring valve main body 7；It is described
The two ends of ring valve main body 7 connect a top sub 3 and a bottom pipe nipple 12 respectively；The internal upper part pipe nipple 3 of the ring valve main body 7 and bottom
A central tube 9 is connected between pipe nipple 12；The upper end of the central tube 9 is provided with a plug 6；The central tube 9 and the ring valve master
Annular space is formed between body 7, the top sub 3 connects to form fluid course with the annular space, the annular space
Interior slip is provided with a piston 8, the closure fluid course of the activity of the piston 8；The top of the central tube 9 be provided with it is described
The heart tube side hole that annular space is communicated；The ring valve main body 7 is provided with the ring valve side opening communicated with the annular space；The ring
Main body set 10 is arranged outside valve body 7, the main body set 10 is provided with the main body side opening communicated with the ring valve side opening.
The main body side opening external side connector 13, oily nonyl 14, lower high-pressure fire hose 16, the first reversing control valve 17 successively,
First reversing control valve 17 connects cement pump truck by pipeline.
The top and bottom of the main body set 10 are sequentially connected upper flange 4 and lower flange 11；The upper flange 4 is sheathed on institute
State on top sub 3, the upper end of the top sub 3 connects a top connection 1.
Cartridge 5 is provided between the upper flange 4 and main body set 10, the sealing property of main body set 10 is improved.
The upper end of the top connection 1 is sequentially connected high-pressure fire hose 15, the second reversing control valve 18；Second commutation
Control valve 18 connects the cement pump truck.
An elevator 2 is arranged outside the top sub 3, the elevator 2 is located at the upper end of the upper flange 4, by the elevator
The well head continuous sand flushing device can be moved easily.
The operation principle of well head continuous sand flushing device：In normal sand washing operation, the sand cleaning fluid that cement pump truck is pumped out passes through
The annular that second reversing control valve 18, upper high-pressure fire hose 15, top sub 3 enter between ring valve main body 7 and central tube 9 is empty
Between, promote piston 8 to move down, after piston 8 closes ring valve side opening, sand cleaning fluid enters bottom pipe nipple 12 by the side opening of central tube 9
With underground process pipe string inner chamber, positive sand washing operation is carried out.When need make up a joint (make up a joint refer to oil drilling when, creeping into
A measure in journey.Because drilling, well are constantly deepened, drill string will also be lengthened in time.Drill string is mainly made up of drilling rod, is boring
During entering, whenever bating after a piece length for drilling rod, just to drilling rod is accessed in drill string, this process is just named and connect
It is single).Cement pump truck works on, and allows sand cleaning fluid to enter from main body side opening, and sand cleaning fluid reaches ring valve main body 7 by ring valve side opening
And the annular space between central tube 9, promote piston 8 to move up, until piston 8 is closed between ring valve main body 7 and central tube 9
Annular space to top sub 3 fluid course, sand cleaning fluid by the side opening of central tube 9 enter bottom pipe nipple 12 and oil pipe inner chamber, enter
Capable not termination of pumping continuous sand flushing operation.Now well head can make up a joint operation, it is single connected after, first open and lead to the second of oil pipe
Reversing control valve 18, is then shut off leading to the first reversing control valve 17 of main body side opening connector, and the stream of sand cleaning fluid is changed again
To making sand cleaning fluid carry out positive sand washing via underground process pipe string and top sub 3 again.Connection tubing string is required in oil each time
Pipe top connects set ring valve reversing assembly in advance, repeats aforesaid operations, you can realize not termination of pumping continuous sand flushing operation.
Embodiment 3
On the basis of embodiment 1, the underground process pipe string includes sleeve pipe 23, is arranged in the oil pipe 19 in sleeve pipe 23,
The lower end of oil pipe 19 is connected with safety and gives up 20, injector 21 is connected with by pipeline in give up 20 lower end of safety, in injector
21 lower ends connect guiding check valve 22.The technique keeps a grip on simple structure, easy construction.
Embodiment 4
In order to overcome existing hydraulic jetting fracturing to keep a grip on not to possess sand washing function, it is necessary under enter a sand washing and keep a grip on not
Foot, the present invention provides a kind of method of the achievable continuous back-up sand separate stratum fracfturing of water-jet, comprises the following steps：
Process pipe string under step 1, lower going-into-well, injector 21 is aligned the first fragment position that need to be transformed.
Step 2, from oil pipe 19 with 0.5m3/ min injects perforating fluid, carries out the hydraulic perforating of coiled tubing 19.
Wherein, when load fluid to nozzle 9 is apart from 200m, discharge capacity to 2.0m is improved3/ min carries out abrasive perforating, perforation
When, perforating fluid is injected from coiled tubing 19, and the annular space of oil pipe 19 and sleeve pipe 23 is returned out.
After the completion of step 3, perforation, annular space (i.e. the abbreviation of annular space) the injection fracturing fluid of oil pipe 19 and sleeve pipe 23, together
When oil pipe 19 keep 0.2m3The base fluid discharge capacity of/min.
4th, after the complete first paragraph of pressure break, calculated since main pressure break latter end, phase is replaced by the annular space of oil pipe 19 and sleeve pipe 23
Sand amount is answered, after settling 1 hour, sand face is visited with underground process pipe string, back-up sand again or replacing well head are carried out according to sand result is visited
Continuous sand flushing device.
Wherein, sand result two kinds of situations again are visited, one kind is that sand face position is too low, then back-up sand to sand face height is being designed again
0.5m below perforated interval；Another kind is as sand face position is too high, then to dismantle fracture well head, is replaced by well head continuous sand flushing device,
Direct circulation sand washing, adjustment sand face height 0.5m below design perforated interval are carried out by this tubing string.
Step 5, repeat step 1-4 complete remaining each section of pressure break.
Step 6, dismounting fracture well head, are replaced by well head continuous sand flushing device, are gone out sand grains using the direct circulation of this tubing string
Pit shaft.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (9)
1. the system of the continuous back-up sand separate stratum fracfturing of a kind of achievable water-jet, it is characterised in that：The system includes underground technique
Tubing string, is connected to the well head continuous sand flushing device of the underground process pipe string upper end.
2. the system that the continuous back-up sand separate stratum fracfturing of water-jet can be realized according to claim 1, it is characterised in that：The well
Mouth continuous sand flushing device includes a ring valve main body (7)；Ring valve main body (7) two ends connect a top sub (3) and one respectively
Bottom pipe nipple (12)；A central tube (9) is connected between the ring valve main body (7) internal upper part pipe nipple (3) and bottom pipe nipple (12)；Institute
The upper end for stating central tube (9) is provided with a plug (6)；Annular is formed between the central tube (9) and the ring valve main body (7) empty
Between, the top sub (3) connects to form fluid course with the annular space, is slided in the annular space and is provided with a piston
(8), the closure fluid course of piston (8) activity；The top of the central tube (9) is provided with and the annular space phase
Logical heart tube side hole；The ring valve main body (7) is provided with the ring valve side opening communicated with the annular space；The ring valve main body
(7) a main body set (10) is arranged outside, the main body set (10) is provided with the main body side opening communicated with the ring valve side opening.
3. the system of the continuous back-up sand separate stratum fracfturing of achievable water-jet according to claim 2, it is characterised in that：It is described
Main body side opening external side connector (13), oily nonyl (14), lower high-pressure fire hose (16), the first reversing control valve (17), first successively
Reversing control valve (17) connects cement pump truck by pipeline.
4. the system of the continuous back-up sand separate stratum fracfturing of achievable water-jet according to claim 1, it is characterised in that：It is described
The top and bottom of main body set (10) connect upper flange (4) and lower flange (11) respectively；The upper flange (4) is sheathed on described
On portion's pipe nipple (3), the upper end of the top sub (3) connects a top connection (1).
5. the system of the continuous back-up sand separate stratum fracfturing of achievable water-jet according to claim 4, it is characterised in that：It is described
The upper end of top connection (1) is sequentially connected high-pressure fire hose (15), the second reversing control valve (18)；Second reversing control valve
(18) the cement pump truck is connected.
6. the system of the continuous back-up sand separate stratum fracfturing of achievable water-jet according to claim 4, it is characterised in that：It is described
Cartridge (5) is provided between upper flange (4) and the main body set (10).
7. the system of the continuous back-up sand separate stratum fracfturing of achievable water-jet according to claim 4, it is characterised in that：It is described
An elevator (2), upper end of the elevator (2) positioned at the upper flange (4) are arranged outside top sub (3).
8. the system of the continuous back-up sand separate stratum fracfturing of achievable water-jet according to claim 4, it is characterised in that：It is described
Underground process pipe string includes sleeve pipe (23), is arranged in the oil pipe (19) in sleeve pipe (23), and oil pipe (19) lower end is connected with peace
Give up entirely (20), injector (21) is connected with by pipeline in the give up lower end of (20) of the safety, in injector (21) lower end
Connection guiding check valve (22)；The oil pipe (19) connects the lower flange (11).
9. a kind of method of the continuous back-up sand separate stratum fracfturing of achievable water-jet, comprises the following steps, it is characterised in that：Including with
Lower step,
Process pipe string under step 1, lower going-into-well, the first fragment position that injector alignment need to be transformed；
Step 2, from oil pipe with 0.5m3/ min injects perforating fluid, carries out coiled tubing hydraulic perforating；When load fluid to the distance of nozzle 9
During 200m, discharge capacity to 2.0m is improved3/ min carries out abrasive perforating, and during perforation, perforating fluid injects from coiled tubing, oil pipe and sleeve pipe
Annular space return out；
After the completion of step 3, perforation, the annular space injection fracturing fluid of oil pipe and sleeve pipe, while oil pipe keeps 0.2m3The base fluid row of/min
Amount；
After the complete first paragraph of step 4, pressure break, calculated since main pressure break latter end, corresponding sand is replaced by the annular space of oil pipe and sleeve pipe
Amount, after settling 1 hour, sand face is visited with underground process pipe string, and according to visiting, sand result carries out back-up sand again or replacing well head is continuous
Sand flushing device；
Step 5, repeat step 1-4 complete remaining each section of pressure break.
Step 6, dismounting fracture well head, are replaced by well head continuous sand flushing device, and sand grains is gone out into pit shaft using the direct circulation of this tubing string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611217342.4A CN106761643A (en) | 2016-12-26 | 2016-12-26 | A kind of system and method for the continuous back-up sand separate stratum fracfturing of achievable water-jet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611217342.4A CN106761643A (en) | 2016-12-26 | 2016-12-26 | A kind of system and method for the continuous back-up sand separate stratum fracfturing of achievable water-jet |
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| CN106761643A true CN106761643A (en) | 2017-05-31 |
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| CN201611217342.4A Pending CN106761643A (en) | 2016-12-26 | 2016-12-26 | A kind of system and method for the continuous back-up sand separate stratum fracfturing of achievable water-jet |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461182A (en) * | 2017-09-08 | 2017-12-12 | 中国石油天然气股份有限公司 | Layering fracturing sand control method |
| CN109138874A (en) * | 2018-10-08 | 2019-01-04 | 大庆荣氏采油技术开发有限公司 | A kind of water injection well fouling cleaning method |
| CN111594126A (en) * | 2020-06-08 | 2020-08-28 | 中国石油天然气集团有限公司 | Sand-filling layered fracturing method for coiled tubing |
| CN113530517A (en) * | 2021-09-17 | 2021-10-22 | 中煤科工集团西安研究院有限公司 | Combined segmented fracturing device, asynchronous two-way extraction system and method |
| CN115653560A (en) * | 2022-11-11 | 2023-01-31 | 中国石油天然气集团有限公司 | Horizontal well single upper seal pipe column sand filling staged fracturing implementation method |
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