CN107013200A - The multiple drawing type nitrogen vibrations fracturing technology of individual well multilayer - Google Patents
The multiple drawing type nitrogen vibrations fracturing technology of individual well multilayer Download PDFInfo
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- CN107013200A CN107013200A CN201710251529.4A CN201710251529A CN107013200A CN 107013200 A CN107013200 A CN 107013200A CN 201710251529 A CN201710251529 A CN 201710251529A CN 107013200 A CN107013200 A CN 107013200A
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- vibrations
- nitrogen
- fracturing
- pressure
- pitching
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 90
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 38
- 239000003245 coal Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 239000002734 clay mineral Substances 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 238000012856 packing Methods 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 15
- 239000010985 leather Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 210000002445 nipple Anatomy 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
- 241000009298 Trigla lyra Species 0.000 description 1
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/255—Methods for stimulating production including the injection of a gaseous medium as treatment fluid into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention belongs to Coal-seam Gas Recovery Technologies field, in order to realize the pressure break being directed in the coal seam reservoirs containing clay mineral, solve the problems, such as that coal bed gas stripper well, not gas-producing well and high yield turn low yield well capacity, there is provided a kind of individual well multilayer multiple drawing type nitrogen vibrations fracturing technology, using ground pitching, suppress, huge discharge injects nitrogen, the operational procedure of dragging realizes the multiple vibrations pressure break of each target zone to the mouth well of the coal seam reservoirs containing clay mineral.The vibrations trigger element of vibrations fracturing tool string employed in fracturing process can realize the vibrations trigger action to ball sealer, vibrations and the high energy gas of huge discharge injection nitrogen release, the microcrack network system that can be undergone an unusual development in matrix of coal is simultaneously linked up with original crack, improve coal reservoir fracture system, effectively solve the problems, such as that coal bed gas stripper well, not gas-producing well and high yield turn low yield well capacity, near wellbore zone obstruction is released, aerogenesis passage is dredged.
Description
Technical field
The invention belongs to Coal-seam Gas Recovery Technologies field, and in particular to a kind of multiple drawing type nitrogen vibrations pressure of individual well multilayer
Split technique.
Background technology
Fracturing technique is to change payzone as a crucial yield-increasing technology during cbm development, its importance
Make to improve the percolation ability of coal petrography reservoir, current hydraulic fracturing still occupies leading position.But sometimes with big in coal seam reservoirs
The clay mineral of amount, particularly kaolinite and illitic presence, this kind of aluminosilicate mineral can be attached at particle surface or fill
Fill in intergranular pore, it is easy to which water combines expansion, block hole and venturi, influence maximum especially in tiny venturi, so that
Porosity and permeability is reduced, fracturing effect is influenceed.
Fracturing fluid in hydraulic fracturing simultaneously can add a certain proportion of chemical reagent, and certain dirt is easily caused to environment
Dye, in addition coal bed gas stripper well, not gas-producing well and high yield turn that stripper well is more, the volume increase solution such as current refracturing, radial well
Plugging technique complex process, investment are higher, and effect of increasing production is limited, therefore based on China's geologic setting, coal seam reservoirs physical property characteristic
Fracturing yield increasing technique and method it is still relatively simple, new clean fracturing yield increase needs research and development badly.
The content of the invention
The present invention solves coal bed gas stripper well, not produced to realize the pressure break being directed in the coal seam reservoirs containing clay mineral
Gas well and high yield turn low yield well capacity problem, and there is provided a kind of single on a kind of clean fracturing mode of the environment without influence
The multiple drawing type nitrogen vibrations fracturing technology of well multilayer.
The present invention is adopted the following technical scheme that：
A kind of multiple drawing type nitrogen vibrations fracturing technology of individual well multilayer, using ground pitching, suppress, huge discharge injects nitrogen,
The operational procedure of dragging realizes the multiple vibrations pressure break of each target zone to the mouth well of the coal seam reservoirs containing clay mineral.
Vibrations fracturing technology Specific construction step be：
1）Discharge opeing and pressure testing
Discharge opeing：Lower drain line starts liquid nitrogen pump vehicle and the work of nitrogen discharge opeing well-flushing is carried out to shaft bottom, clearly to coal bed gas well completion bottom
Shaft bottom air-water mixture after washing returns out ground by coiled tubing；
Pressure testing：Discharge opeing completes and after after liquid nitrogen pump vehicle cooling, carries out manifold pressure testing, if without pressure after pressure-bearing and voltage stabilizing certain time
Drop, then pressure testing is qualified；Wherein, voltage stabilizing value is not less than 60MPa, and voltage stabling control is no less than 5min；
2）Individual layer single nitrogen shakes pressure break：Connection vibrations fracturing tool string（5）And transferred to oil pipe after specified target zone, lead to
Cross ground ball-throwing apparatus and carry out a pitching, start liquid nitrogen pump vehicle and ball sealer is transported to vibrations fracturing tool string（5）Vibrations
At triggering, reach after predetermined pressure, globules rupture, high energy gas enters purpose reservoir by release device, carry out immediately big
Discharge capacity injects nitrogen, completes this vibrations pressure break；
3）The multiple nitrogen vibrations pressure break of individual layer：Pitching is repeated at the ball-throwing apparatus of ground, according to above-mentioned steps 2）Fracturing step
Carry out multiple nitrogen vibrations pressure break；
4）The multiple nitrogen vibrations pressure break of multilayer：After upper target zone pressure break is finished, dragging upwards shakes fracturing tool string（5）'s
Cup type packer is to next target zone, by step 3）Pitching vibrations are repeated, the multiple nitrogen vibrations pressure break of multilayer is realized.
In described discharge opeing process, ground is returned and recycling can and torch is provided with comb line, and torch cell distance well head is not
Less than 50m.
After the ball-throwing apparatus pitching of ground, discharge capacity when liquid nitrogen pump vehicle starts is 300m3/min；When huge discharge injects, row
Amount is not less than 800m3/min。
The predetermined pressure of ball sealer by ball sealer and vibrations fracturing tool string ball seat between matching determine, predetermined pressure
10MPa is no more than with test pressure error.
It is a kind of to complete the operating system that the multiple drawing type nitrogen of individual well multilayer shakes fracturing technology, including liquid nitrogen pump vehicle, company
Continuous oil pipe car, injection head and vibrations fracturing tool string, the nitrogen output pipe of liquid nitrogen pump vehicle are divided into two groups, and one group successively through continuous
Enter vibrations fracturing tool string after oil pipe car, injection head, second group is directly accessed shaft bottom by oil pipe.
Connecting line and shaft bottom pipeline manifold between the liquid nitrogen pump vehicle group nitrogen output pipe and Operation Tubing Aggregate
After be circumscribed with recovery pond.
Described vibrations fracturing tool string includes the upper packing units, vibrations trigger element, energy being sequentially connected from top to bottom
Measure releasing unit, pressure-recording unit, lower packing units and be oriented to guide shoe, vibrations trigger element completes the shake to pitching ball sealer
Dynamic, energy releasing unit completes the release of the high energy gas produced by being burst to ball sealer, and the top of upper packing units passes through even
Continuous oil pipe is connected with ground fracturing car pump truck.
Described upper packing units and lower packing units at least include two groups of cup type packers, the two of upper packing units respectively
Open Side Down for the leather cup of group cup type packer, the leather cup opening upwards of two groups of cup type packers of lower packing units, upper packing list
First and lower packing units constitute the sealing unit to high energy gas.
Described vibrations trigger element be one have shock-absorbing capacity taper ball seat, the two ends channel width of taper ball seat,
Center-aisle is narrow, and middle narrow passage diameter is less than pitching and seals bulb diameter, and two ends fat pipe diameter is more than pitching and seals bulb diameter.
The energy releasing unit is the pipe nipple that respectively there is a relief hole both sides.
The pressure-recording unit includes supporting body and memory-type pressure sensor, and supporting body uses solid oil pipe, storage
Formula pressure sensor is installed on solid oil pipe termination.
The a diameter of 38.1mm or 34.9mm of the ball sealer.
The present invention has the advantages that：
（1）The present invention is employed nitrogen as pressure break medium, can be achieved to the pressure break in the coal seam reservoirs containing clay mineral；
（2）The present invention can mend the blank that domestic coal bed gas shakes pressure break field in nitrogen, the multiple drawing type of individual well multilayer
Nitrogen shakes the research and development of fracturing technology, it is possible to achieve each target zone of every mouthful of well realizes repeatedly vibrations pressure break, both saves
Time, also reduce the intensity of consumption of tool string；
（3）The vibrations trigger element of vibrations fracturing tool string can realize the vibrations trigger action to ball sealer, vibrations and huge discharge
The high energy gas of nitrogen release is injected, the microcrack network system that can be undergone an unusual development in matrix of coal is simultaneously linked up with original crack,
Coal reservoir fracture system is improved, effectively solves the problems, such as that coal bed gas stripper well, not gas-producing well and high yield turn low yield well capacity, releases near
Well ground tape jam, dredges aerogenesis passage；
（4）Without any chemical reagent in pressure break, the nitrogen for the row of returning does not cause any pollution to environment yet, is a kind of cleaning
Pressure break mode.
Brief description of the drawings
Fig. 1 is job execution flow chart of the invention；
Fig. 2 is the structural representation of vibrations fracturing tool string；
Fig. 3 is the structural representation of vibrations trigger element；
Fig. 4 is the structural representation of energy releasing unit；
In figure：1- liquid nitrogen tank car, 2- liquid nitrogen fracturing unit truck, 3- Operation Tubing Aggregates, 4- injection heads, 5- vibrations fracturing tools string, 6- sections
Flow tube is converged, 7- recovery ponds（Mud pit）, 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.-valve；
Insulated under the upper packing units of 51-, 52- vibrations trigger element, 53- energy releasing unit, 54- pressure-recording units, 55- single
Member, 56- are oriented to guide shoe, 57- boxes, 58- tapers ball seat, 59- pin threads, 60- relief holes.
Embodiment
With reference to accompanying drawing, the embodiment to the present invention is described further：
The construction process of the present invention is as shown in figure 1, completing the operating system of nitrogen vibrations fracturing technology includes liquid nitrogen pump vehicle group, connects
Continuous oil pipe car 3, injection head 4 and vibrations fracturing tool string 5, the nitrogen output pipe of liquid nitrogen pump vehicle is divided into two groups, and one group passes through successively
Enter vibrations fracturing tool string 5 after Operation Tubing Aggregate 3, injection head 4, second group is directly accessed shaft bottom by oil pipe.The liquid nitrogen
Recovery pond is circumscribed with after connecting line and shaft bottom pipeline manifold between pump truck group nitrogen output pipe and Operation Tubing Aggregate 3.
Wherein, liquid nitrogen pump vehicle is at least provided with two groups, including the liquid nitrogen tank car 1 and liquid nitrogen fracturing unit truck 2 being connected.Three can be passed through between pipeline
Lead to and connect, the ball valve valve that control piper break-make is 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. respectively equipped with position in Fig. 1 pipelines.
The structure of described vibrations fracturing tool string 5 is as shown in Fig. 2 the upper packing list including being sequentially connected from top to bottom
51st, vibrations trigger element 52, energy releasing unit 53, pressure-recording unit 54, lower packing units 55 and guiding guide shoe 56, vibrations
Trigger element 52 completes the vibrations to pitching ball sealer, and energy releasing unit 53 completes the high energy gas produced by being burst to ball sealer
The release of body, the top of upper packing units 51 is connected by coiled tubing with ground fracturing car pump truck.The device can meet vibrations,
Two main contents are discharged, and the gas discharged can enter purpose of horizon, the role of each unit is as follows：
1）Upper and lower cup type packer unit
Upper packing units 51 and lower packing units 55 at least include two groups of cup type packers, two groups of cups of upper packing units 51 respectively
Open Side Down for the leather cup of type packer, the leather cup opening upwards of two groups of cup type packers of lower packing units 55, upper packing units
51 and lower packing units 55 constitute sealing unit to high energy gas.The effect of upper packer is to work as vibrations trigger element action,
Gases at high pressure（N2）When being discharged between the upward lower packet of coiled tubing, the sealing unit for preventing gas from leaking upwards, lower envelope
It is to work as vibrations trigger element action, gases at high pressure every the effect of device（N2）When being discharged between the upward lower packet of coiled tubing,
The sealing unit for preventing gas from leaking downwards.
2）Shake trigger element
As shown in figure 3, the unit be designed as one have shock-absorbing capacity taper ball seat, the two ends channel width of taper ball seat,
Center-aisle is narrow, and middle narrow passage diameter is less than pitching and seals bulb diameter, and two ends fat pipe diameter is more than pitching and seals bulb diameter.
Before non-pitching, because taper ball seat is the passage of a undergauge, it is allowed to which nitrogen N 2 is from coiled tubing between cup-type packer
And coal seam（Sleeve pipe perforation）Flowing is spread；After pitching, ball sealer is stuck at the middle narrow passage of taper ball seat, is prevented
The passage that N2 spreads downwards, makes ground fracturing pump truck and vibrations trigger element formation confined space, in ground fracturing pump truck
Under effect, this closed cells storage high pressure nitrogen N2, when the pressure of nitrogen N 2 reaches rated value so that sealed spheroid bursts,
The high pressure N2 stored in coiled tubing and ground pump truck system discharges to coal seam reservoirs（The effect of upper lower packet）, form moment high
Pressure vibrations, so as to transform reservoir.
3）Energy releasing unit
The structure of energy releasing unit works as globules rupture as shown in figure 4, respectively there is the pipe nipple of a relief hole predominantly one both sides
When, high pressure nitrogen enters target zone by the relief hole, causes the vibrations of near wellbore zone, so that new crack is formed, transformation storage
Layer.
4）Pressure-recording unit
Pressure-recording unit is in the bottom of energy releasing unit, on lower packet, including one section of pressure record
Pipe nipple, intends the supporting body as pressure record equipment using a bit of solid oil pipe, installs memory-type pressure sensor, to survey
The situation of change of bottom pressure in vibrations fracturing process is measured, recorded and be stored in, is easy to later data to analyze and different well nitrogens
Shake the comparison of crushing test achievement.
5）The design of ball sealer
Ball sealer for setting and opening is a part of most critical, it is desirable to which the ball sealer has certain anti-pressure ability,
It is made of special material, existing anti-pressure ability can open gas passage in specified pressure limit implosive again, sit
The size of blocking selects 1 1/2 "（38.1mm）Or 1 3/8 "（34.9mm）.Ball sealer is matured product, it is only necessary to according to coal seam
Condition selects the ball sealer of suitable resistance to compression value and diameter.
The use principle for shaking fracturing tool string is as follows：
1）Well head pitching
In nitrogen vibrations fracturing process, first pass through the fracturing device of coiled tubing from well head to underground and carry out pitching, note simultaneously
Enter high energy gas（N2）.
2）Pitching in place, persistent pressure
When pitching in place（I.e. at taper ball seat）Afterwards, vibrations trigger element prevents high energy gas（N2）Diffusion, makes ground downwards
Fracturing unit truck and vibrations trigger element formation confined space, in the presence of ground fracturing car, closed vibrations trigger element storage is high
Calm the anger body（N2）.
3）High voltage shock, transforms reservoir
Work as gases at high pressure（N2）Spheroid bursts when pressure reaches rated value, the high pressure stored in coiled tubing and ground pump truck system
Gas（N2）Discharged to coal seam reservoirs（The effect of upper and lower packer）, instantaneous pressure vibrations are formed, so as to transform reservoir.
4）Pressure record
Using supporting body of a bit of solid oil pipe as pressure record equipment, memory-type pressure sensor is installed, to measure, remember
The situation of change of bottom pressure in vibrations fracturing process is recorded and be stored in, is easy to later data to analyze and different well nitrogen vibrations pressures
Split the comparison of test result.
Specific vibrations fracturing technology step of the invention is as follows：
1）Discharge opeing and pressure testing：
Discharge opeing：In coiled tubing tripping in apart from bottom about 2m positions --- 3. 6. 10. one group of pressure break pump truck is started, valve is opened 2.,
1. 4. 5. valve is closed, 3. the high pressure nitrogen pumped out from fracturing unit truck injects nitrogen with low discharge capacity by valve to oil pipe and casing annulus
The air-water mixture in gas --- shaft bottom returns out ground by coiled tubing, 10. 2. enters choke manifold by valve, by throttling
Mud pit formation gaslift draining is 6. discharged into after the current limliting of manifold through valve.
Backflow should be controlled using choke valve during draining, when discharge outlet water reduces tolerance increase, is beaten
6. 5. valve opening door, close valve, reflux gas is discharged at torch, and nitrogen should be stopped when confirming anhydrous and debris in backflow
Pump truck injects, and keeps pipe-line system to carry out pressure release, proposes coiled tubing outside well after pressure release.
Pressure testing：2. 3. 4. 5. 6. 7. after nitrogen fracturing unit truck is cooled down, nitrogen pressure test is carried out to all pipelines, closed 1.
8. 1. 9. 10. valve, open 2. valve, slow to play pressure, observation pressure change and each connecting portion sealing situation, confirms without substantially
After gas leakage, continue to suppress to 70 MPa, after termination of pumping 5min, confirm after the steady No leakage of pressure, open valve and 5. control to bleed off pressure.
2）Individual layer single nitrogen shakes pressure break：3. 5. 4. 10. start one group of pressure break pump truck, open valve 1., close valve 2.
6., in 7. 8. 9. pitching at valve location, 10. 1. the high pressure nitrogen pumped out by fracturing unit truck entered continuous with low discharge capacity by valve
Oil pipe car, ball is pumped at taper ball seat, pressure gradually rises, when reaching what is monitored in predetermined pressure and Operation Tubing Aggregate
During abrupt pressure reduction, start another group of nitrogen pressure break pump truck, two pumps car supplies high pressure nitrogen to Operation Tubing Aggregate simultaneously, and to arrange greatly
Amount（It is not less than 800m3/min）Injected, noted until whole nitrogen, termination of pumping to target coal seam by coiled tubing.
3）The multiple nitrogen vibrations pressure break of individual layer：, should during pitching by the way that 7. 8. 9. valve location carries out repeating pitching
It is follow-up to repeat the step of individual layer single nitrogen shakes pressure break with the down release of 300m3/min discharge capacity.
4）The multiple nitrogen vibrations pressure break of multilayer：Next target zone position is calculated, cup type packer is dragged upwards to purpose
Layer position, starts to repeat individual layer multiple nitrogen vibrations fracturing step, after the completion of continue up and drag to next purpose of horizon, start pressure
Split, untill completion is split in all purposes lamination.
In construction technological process of the present invention, following safety requirements need to be met：
1st, No Open Flames for job site, and scene should be equipped with the fire fighting devices such as fire extinguisher；
2nd, torch will can be in time to high energy nitrogen pressure release, choke manifold will have fixed and adjustable full-bore bypass, and institute
There is manifold to be pooled to the torch unit apart from the m of well head 50；
3rd, well site will have blowdown recycling can, and going out well liquid will fully enter wherein；
4th, blowout, well head thorn leakage are noted in constructing, periphery producing well, village etc. is noted, related well control work is carried out.
Claims (10)
1. a kind of multiple drawing type nitrogen vibrations fracturing technology of individual well multilayer, it is characterised in that using ground pitching, suppress, greatly
Discharge capacity injection nitrogen, the operational procedure of dragging are realized to the multiple of each target zone of the mouth well of the coal seam reservoirs containing clay mineral
Pressure break is shaken, specific construction procedure is：
1）Discharge opeing and pressure testing
Discharge opeing：Lower drain line starts liquid nitrogen pump vehicle and the work of nitrogen discharge opeing well-flushing is carried out to shaft bottom, clearly to coal bed gas well completion bottom
Shaft bottom air-water mixture after washing returns out ground by coiled tubing；
Pressure testing：Discharge opeing completes and after after liquid nitrogen pump vehicle cooling, carries out manifold pressure testing, if without pressure after pressure-bearing and voltage stabilizing certain time
Drop, then pressure testing is qualified；Wherein, voltage stabilizing value is not less than 60MPa, and voltage stabling control is no less than 5min；
2）Individual layer single nitrogen shakes pressure break：Connection vibrations fracturing tool string（5）And transferred to oil pipe after specified target zone, lead to
Cross ground ball-throwing apparatus and carry out a pitching, start liquid nitrogen pump vehicle and ball sealer is transported to vibrations fracturing tool string（5）Vibrations
At triggering, reach after predetermined pressure, globules rupture, high energy gas enters purpose reservoir by release device, carry out immediately big
Discharge capacity injects nitrogen, completes this vibrations pressure break；
3）The multiple nitrogen vibrations pressure break of individual layer：Pitching is repeated at the ball-throwing apparatus of ground, according to above-mentioned steps 2）Fracturing step
Carry out multiple nitrogen vibrations pressure break；
4）The multiple nitrogen vibrations pressure break of multilayer：After upper target zone pressure break is finished, dragging upwards shakes fracturing tool string（5）'s
Cup type packer is to next target zone, by step 3）Pitching vibrations are repeated, the multiple nitrogen vibrations pressure break of multilayer is realized.
2. the multiple drawing type nitrogen vibrations fracturing technology of individual well multilayer according to claim 1, it is characterised in that：On ground
After ball-throwing apparatus pitching, discharge capacity when liquid nitrogen pump vehicle starts is 300m3/min；When huge discharge injects, discharge capacity is not less than 800m3/
min。
3. the multiple drawing type nitrogen vibrations fracturing technology of individual well multilayer according to claim 2, it is characterised in that：Ball sealer
Predetermined pressure by ball sealer with vibrations fracturing tool string（5）Matching decision between ball seat, predetermined pressure and test pressure
Error is no more than 10MPa.
4. a kind of complete the operation system that any multiple drawing type nitrogen of individual well multilayer of claims 1 to 3 shakes fracturing technology
System, it is characterised in that：Including liquid nitrogen pump vehicle, Operation Tubing Aggregate（3）, injection head（4）With vibrations fracturing tool string（5）, liquid nitrogen pump
The nitrogen output pipe of car is divided into two groups, and one group successively through Operation Tubing Aggregate（3）, injection head（4）Enter vibrations fracturing tool afterwards
String（5）, second group is directly accessed shaft bottom by oil pipe.
5. a kind of complete the operating system that the multiple drawing type nitrogen of individual well multilayer described in claim 4 shakes fracturing technology, it is special
Levy and be：The liquid nitrogen pump vehicle group nitrogen output pipe and Operation Tubing Aggregate（3）Between connecting line and shaft bottom pipeline pipe
Recovery pond is circumscribed with after remittance（7）.
6. the multiple drawing type nitrogen vibrations fracturing work system of individual well multilayer according to claim 5, it is characterised in that：Institute
The vibrations fracturing tool string stated（5）Including the upper packing units being sequentially connected from top to bottom（51）, vibrations trigger element（52）, energy
Measure releasing unit（53）, pressure-recording unit（54）, lower packing units（55）With guiding guide shoe（56）, shake trigger element（52）
Complete the vibrations to pitching ball sealer, energy releasing unit（53）Complete releasing for the high energy gas produced by being burst to ball sealer
Put, upper packing units（51）Top be connected by coiled tubing with ground fracturing car pump truck.
7. the multiple drawing type nitrogen vibrations fracturing work system of individual well multilayer according to claim 6, it is characterised in that：Institute
The upper packing units stated（51）With lower packing units（55）At least include two groups of cup type packers, upper packing units respectively（51）'s
Open Side Down for the leather cup of two groups of cup type packers, lower packing units（55）Two groups of cup type packers leather cup opening upwards, on
Packing units（51）With lower packing units（55）Constitute the sealing unit to high energy gas.
8. the multiple drawing type nitrogen vibrations fracturing work system of individual well multilayer according to claim 7, it is characterised in that：Institute
The vibrations trigger element stated（52）It is a taper ball seat with shock-absorbing capacity, the two ends channel width of taper ball seat, centre are logical
Road is narrow, and middle narrow passage diameter is less than pitching and seals bulb diameter, and two ends fat pipe diameter is more than pitching and seals bulb diameter.
9. the multiple drawing type nitrogen vibrations fracturing work system of individual well multilayer according to claim 8, it is characterised in that：Institute
State energy releasing unit（53）It is the pipe nipple that respectively there is a relief hole both sides.
10. the multiple drawing type nitrogen vibrations fracturing work system of individual well multilayer according to claim 9, it is characterised in that：
The pressure-recording unit（54）Including supporting body and memory-type pressure sensor, supporting body uses solid oil pipe, memory-type pressure
Force snesor is installed on solid oil pipe termination.
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