CN109538177A - A kind of supercritical CO2The new process of pressure break - Google Patents
A kind of supercritical CO2The new process of pressure break Download PDFInfo
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- CN109538177A CN109538177A CN201811221030.XA CN201811221030A CN109538177A CN 109538177 A CN109538177 A CN 109538177A CN 201811221030 A CN201811221030 A CN 201811221030A CN 109538177 A CN109538177 A CN 109538177A
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- 230000008569 process Effects 0.000 title claims abstract description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 29
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 9
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- 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
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Classifications
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
Abstract
The present invention relates to a kind of supercritical COs2The new process of pressure break, belongs to technical field of petroleum extraction.The present invention mainly overcomes shortcoming in the prior art, proposes a kind of supercritical CO2The new process of pressure break is the following steps are included: open flow returns row after (1) clear well, (2) perforation, (3) frac treatment, (4) injection proppant, (5) staged fracturing, (6) isolation processing, (7) bored well processing, (8) pressure.The present invention uses supercritical CO2The method that fracturing fluid and conventional fracturing fluid load fluid pump note simultaneously is giving full play to overcritical supercritical CO2The supplement stratum energy of fracturing fluid, it is easier to which the effect for generating complex fracture simultaneously, also gives full play to supercritical CO under conditions of not needing closed system with the method for its mixed water injection using conventional pressure break2The advantage of pressure break, and the shortcomings that evade conventional pressure break.
Description
Technical field
The present invention relates to a kind of supercritical COs2The new process of pressure break, belongs to technical field of petroleum extraction.
Background technique
With to petroleum resources demand growth and exploration and development go deep into, fracturing reform is hypotonic, ultra-low permeability reservoir
The key of economic development, it is more and more concerned.Exploitation for shale gas reservoir, bed gas reservoir, hypotonic special low permeability oil field etc., pressure
Splitting transformation is necessary means, but the pressure break of shale gas leads poor performance, consumption great lot of water resources and pressure in the presence of the row of returning always at present
The disadvantages of associated contamination caused by after splitting.
Hydraulic fracturing technology is most proposed early in the 1940s, was mainly used in old well reform at that time, is improved recovery ratio,
Hydraulic fracturing technology has become the master of the untraditional reservoirs such as hypotonic super low percolation oilfield, shale gas reservoir, bed gas reservoir volume increase at present
Want one of measure.It utilizes ground high pressure pump group, to be more than the discharge capacity of stratum (reservoir) absorbability by fracturing fluid injection well
Cylinder, produces high pressure, when the pressure overcomes the tensile strength of crustal stress and rock near the borehole wall, it will make stratum near shaft bottom
It ruptures and extends certain distance；As fracturing fluid is persistently pumped into, crack continues to extend forward, after crack reaches desired size,
Pump note is mixed with the load fluid of proppant, and load fluid will continue extension crack and will be in proppant transport to crack；Load fluid pumping
After, pump gel breaker, the liquid that high glutinous fracturing liquid rubber-breaking is reduced to low viscosity flowed back into pit shaft, returns and is discharged to ground, in this way when
Proppant is left behind after pressure break, in crack and is used to support crack wall surface, forms the crack with high refluence ability
Channel.
It is well known that the purpose of hydraulic fracturing is to generate the fissure channel with high flow conductivity, pit shaft is penetrated
The injury area in area makes oil well restore natural production capacity.But for traditional pressure break, need to inject a large amount of high viscosity fracturing fluids, it
After need gel breaker to be broken glue, return discharge fracturing fluid, it is not only at high cost in this way, but also program is complicated, while a large amount of water enters
Reservoir causes reservoir secondary injury, reservoir permeability is reduced, to reduce fracturing effect.Although there are many clean fracturings at present
Liquid is come reservoir secondary pollution when coping with this problem, mitigation reservoir damage, but still fundamentally can not thoroughly eliminate pressure break.
Researcher attempts CO2And N2Inert gas, which is squeezed into fracturing fluid, is made foam fracturing fluid to carry out hydraulic fracturing,
After in this way, fracturing fluid viscosity is greatly improved, and fracturing fluid friction loss reduces, and solid-carrying performance and outstanding grittiness can good, energy
Crack is preferably strutted, fracturing fluid penetrates the enhancing of crack ability, and the recovery ratio of petroleum resources greatly improves, but passes through long-term practice
Later, discovery is there are a series of problems, contains a large amount of frozen glue and acid solution in foam fracturing fluid, when fracturing fluid recovery (backflow), fracturing fluid
In gas expansion ability it is strong, the easy row of returning, but be easy chemical residue in the earth formation, pollution stratum, and in fracturing fluid
After gas is added, the temperature and pressure of fracturing fluid is not easy to control in pit shaft.
In foam fracturing fluid, CO2The overwhelming majority is in gaseous state, but in actual live fracturing technology, due to
The fluid temperature (F.T.) pumped in injection pressure power and pit shaft or formation fracture is higher, has been over CO2Critical state (7.382MPa,
31.16 DEG C), therefore the CO in foam fracturing fluid2Supercritical Conditions are in, thus researcher considers to attempt using critical
State CO2Fluid carries out pressing crack construction to replace Common fracturing fluid.
Supercritical CO2Fracturing fluid rises therewith as a kind of New Fracturing Fluid, critical, supercritical fluid fracturing technique.
Critical state CO2Fluid, density ratio gas is big, and close to liquid, viscosity and gas are close, and diffusion coefficient is big, therefore have fine
Flowing and transporting in comparison can strut crack to greatest extent, and the petroleum resources in crack are absorbed
Come, Lai Tigao recovery ratio, in addition supercritical CO2Without water phase in fracturing fluid, stratum will not be made to generate creep, in pressing crack construction
After the completion, it heats up, be depressured, CO2Gaseous state is become by liquid, is discharged from stratum, is remained without residue when the row of returning, can protect reservoir,
The reservoir permeability of increase, and critical state CO2The fracturing fluid easily row of returning is the fracturing technology of a kind of pair of stratum fanout free region.
But supercritical CO2Fracturing fluid viscosity is low, poor lubricity, and frictional resistance is high, and fracturing technology needs accurate instrument,
Suitable temperature, pressure condition is needed in payzone, closed fracturing blender truck is needed in construction, construction cost increases, in the big of low oil price
Under environment, supercritical CO2Pressure break is unsuitable for promoting on a large scale.
Summary of the invention
The present invention mainly overcomes shortcoming in the prior art, proposes a kind of supercritical CO2The new process of pressure break, this
Invention uses supercritical CO2Fracturing fluid and conventional fracturing fluid load fluid pump simultaneously the method for note give full play to it is overcritical
CO2The supplement stratum energy of fracturing fluid, it is easier to generate the effect of complex fracture simultaneously, using conventional pressure break also with its mixed water injection
Method gives full play to supercritical CO under conditions of not needing closed system2The advantage of pressure break, and evade conventional pressure break
Disadvantage.
The present invention solves technical solution provided by above-mentioned technical problem: a kind of supercritical CO2The new process of pressure break, packet
Include following steps:
(1) clear well: simultaneously drifting after circulation well cleanup；
(2) perforation: by coiled tubing by liquid CO2It is transported in well, carrying out perforation by fracturing device produces reservoir
Raw duct；
(3) frac treatment: continuing at the same be pumped into liquid CO2With the load fluid of conventional fracturing fluid；
(4) inject proppant: injection proppant, proppant is with liquid CO2Into generated crack, when entrance crack
When proppant reaches predetermined quantity, stopping is mixed into proppant, and stopping is pumped into liquid CO2, complete one section of fracturing work；
(5) staged fracturing: the crack and duct of pressure break are isolated；
(6) isolation processing: fracture and duct are blocked；
(7) next section of pressure break position will be mentioned on oil pipe, then repeatedly step (2)-(4), complete next section of fracturing work；
(8) bored well processing: after completing final step fracturing work, after a fracturing treatment, bored well processing is carried out, after bored well again
Opening well and making production；
(9) open flow returns row after pressing: controlling open flow speed using oil nozzle, prevents CO2It returns to be drained through and causes to spit sand fastly；Use CO2Prison
Survey instrument monitoring outlet CO2Concentration variation, works as CO2Concentration is lower than 3.0%, returns drained at entire CO after the row of returning terminates2Pressure break work
Skill terminates.
Further technical solution is that clear water or flushing fluid circulation well cleanup are used in the step (1).
Further technical solution is that conventional fracturing fluid is slippery water in the step (3).
Further technical solution is the liquid CO2Displacement pump injection be greater than 3-10m3/ min, the discharge capacity of slippery water
For 8-12m3/min。
Further technical solution is to carry out blocking crack and hole using insulating liquid or packer in the step (6)
Road.
The invention has the following advantages that
(1) supercritical carbon dioxide pressure break without water phase, it is applied widely without residue, economical and effective and stratum.This technique
Utilize supercritical CO2Energy increasing function, supplement stratum energy while pressure break；
(2) supercritical carbon dioxide pressure break is by seam effect, dissolution, suction-operated or metathesis, effectively
Improve yield, recovery ratio and the throughput rate of oil-gas reservoir；
(3) requirement to site operation environment and equipment is reduced, closed system when overcritical pressure break is not needed, is pressed
It is low to split difficulty of construction, is conducive to promote and apply in unconventional oil and gas exploitation；
(4) this supercritical CO2Pressure break and conventional pressure break hybrid technique can preferably play fracturing transformation effect.
Detailed description of the invention
Fig. 1 is CO2Phase-state change figure.
Specific embodiment
Further description is done to the present invention below with reference to embodiment and attached drawing.
A kind of supercritical CO of the invention2The new process of pressure break, comprising the following steps:
(1) critical state CO2Fracturing fluid is preferred: using CO2Tank car transports, CO2Storage tank is preferably able to pressure-bearing 10MPa or so,
Guarantee CO2It is in liquid under certain temperature and pressure, while to have Insulation, maintains CO2Face state state minimum temperature.CO2
Refrigeration machine can be installed on tank car, guarantee the needs in transportational process and being pumped into before fracturing unit truck.CO2Transport pressure generally may be used
With control in 3-5MPa, temperature is controlled at -20 DEG C -5 DEG C, in this way guarantee transportation safety.
(2) clear well: clear water or flushing fluid circulation well cleanup are utilized, and with gauguste cutter drifting；
(3) perforation: by coiled tubing by liquid CO2It is transported in well, carrying out perforation by fracturing device produces reservoir
Raw duct；
(4) frac treatment: continuing at the same pump fluid injection state CO2With the load fluid of conventional fracturing fluid, the routine fracturing fluid
For slippery water；
Liquid CO2It will become supercritical CO in pit shaft certain depth2Fluid simultaneously carries out pressure break to reservoir, splits reservoir generation
Seam；
Wherein liquid CO2Displacement pump injection be greater than 3-10m3/ min, the discharge capacity of slippery water are 8-12m3/min。
(5) inject proppant: injection proppant, proppant is with liquid CO2Into generated crack, when entrance crack
When proppant reaches predetermined quantity, stopping is mixed into proppant, and stopping is pumped into liquid CO2, complete one section of fracturing work；
(6) it staged fracturing: when carrying out two sections or more of pressure break, needs that the crack of pressure break and duct is isolated；
Avoid the mixing fracturing fluid for pumping note in subsequent pressure break from pouring in first segment crack, insulating liquid to have viscosity higher and
Low filtration property avoids penetrating into reservoir when pressure break too much as far as possible, at the same require fracturing fluid at a certain temperature can with aquation, with
Just the row of returning after pressure break.
(7) isolation processing: input insulating liquid carries out blocking crack and duct using packer；
(8) next section of pressure break position will be mentioned on oil pipe, then repeatedly step (3), (4), (5), complete next section of pressure break
Operation；
(9) bored well processing: after completing final step fracturing work, after a fracturing treatment, bored well processing is carried out, for viscous crude
Oil reservoir, CO when bored well2Reduce Crude viscosity；For shale gas, fine and close gas reservoir, CO when bored well2Well into hole or microcrack
Replace coal bed gas and shale gas CH4, opening well and making production again after bored well.
(10) open flow returns row after pressing: controlling open flow speed using suitable oil nozzle, prevents CO2It returns to be drained through and causes to spit sand fastly；
Use CO2Monitor monitoring outlet CO2Concentration variation, works as CO2Concentration be lower than 3.0%, be considered as return it is drained at after the row of returning terminates
Entire CO2Fracturing technology terminates.
The present invention utilizes supercritical CO2Almost nil surface tension and high diffusion coefficient and the very strong infiltration having
Saturating ability easily infiltrates into lesser hole and microcrack, to generate complex fracture in unconventional compact reservoir, reaches preferable
Fracturing effect, largely increase seepage area, effectively the oil gas in displacement reservoir, so improve oil-gas reservoir harvesting
Rate；For gas well, CO2The adsorption capacity ratio CH of the reservoirs such as molecule and shale gas, coal bed gas4The adsorption capacity of molecule and reservoir is strong,
And critical state CO2The good fluidity in Reservoir Fracture can displace the CH being adsorbed4Molecule makes the CH of ADSORPTION STATE4Become
Free state, to keep higher yield in a long time after making gas well go into operation；Supercritical CO2Fluid density is big, has very strong
Solvability, can dissolve the heavy oil component and other pollutants of near wellbore zone, reduce the flow resistance of near wellbore zone oil gas；
Supercritical CO2Without water phase in fracturing fluid, stratum will not be made to generate creep, easily the row of returning and when the row of returning without residue residual, can be with
Reservoir is protected, reservoir permeability is increased；Liquid CO2Good mobility is able to enter the microscopic void and throat of reservoir, expands
Involve range, simultaneously as the compressibility that liquid carbon dioxide is bigger, can discharge elastic energy quickly after pressure break, it is right
Stratum energy is quickly supplemented, and realizes CO2Pressure break is integrated with stratum energy supplement, liquid CO2Unit liquid measure strata pressure
Amplification is 2 times of slippery water fracturing technique.
The above is not intended to limit the present invention in any form, although the present invention takes off through the foregoing embodiment
Show, however, it is not intended to limit the invention, any person skilled in the art, is not departing from technical solution of the present invention range
It is interior, made when the technology contents using the disclosure above and change or be modified to the equivalent embodiments of equivalent variations a bit, but it is all not
Be detached from technical solution of the present invention content, according to the technical essence of the invention it is to the above embodiments it is any it is simple modification,
Equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (5)
1. a kind of supercritical CO2The new process of pressure break, which comprises the following steps:
(1) clear well: simultaneously drifting after circulation well cleanup；
(2) perforation: by coiled tubing by liquid CO2It is transported in well, carrying out perforation by fracturing device makes reservoir generate hole
Road；
(3) frac treatment: continuing at the same be pumped into liquid CO2With the load fluid of conventional fracturing fluid；
(4) inject proppant: injection proppant, proppant is with liquid CO2Into generated crack, when the support for entering crack
When agent reaches predetermined quantity, stopping is mixed into proppant, and stopping is pumped into liquid CO2, complete one section of fracturing work；
(5) staged fracturing: the crack and duct of pressure break are isolated；
(6) isolation processing: fracture and duct are blocked；
(7) next section of pressure break position will be mentioned on oil pipe, then repeatedly step (2)-(4), complete next section of fracturing work；
(8) bored well processing: after completing final step fracturing work, after a fracturing treatment, bored well processing is carried out, is driven a well again after bored well
Production；
(9) open flow returns row after pressing: controlling open flow speed using oil nozzle, prevents CO2It returns to be drained through and causes to spit sand fastly；Use CO2Monitor
Monitoring outlet CO2Concentration variation, works as CO2Concentration is lower than 3.0%, returns drained at entire CO after the row of returning terminates2Fracturing technology knot
Beam.
2. a kind of supercritical CO according to claim 12The new process of pressure break, which is characterized in that adopted in the step (1)
With clear water or flushing fluid circulation well cleanup.
3. a kind of supercritical CO according to claim 12The new process of pressure break, which is characterized in that in the step (3) often
Rule fracturing fluid is slippery water.
4. a kind of supercritical CO according to claim 32The new process of pressure break, which is characterized in that the liquid CO2Row
Amount pump injection is greater than 3-10m3/ min, the discharge capacity of slippery water are 8-12m3/min。
5. a kind of supercritical CO according to claim 12The new process of pressure break, which is characterized in that adopted in the step (6)
It is carried out blocking crack and duct with insulating liquid or packer.
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Cited By (8)
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| CN110513094A (en) * | 2019-09-06 | 2019-11-29 | 陕西延长石油（集团）有限责任公司 | A kind of Variable Composition carbon dioxide acid fracturing method |
| CN112253066A (en) * | 2019-07-03 | 2021-01-22 | 中国石油化工股份有限公司 | Method for improving fracture complexity and transformation volume of deep shale gas |
| CN112761598A (en) * | 2021-02-05 | 2021-05-07 | 西南石油大学 | Method and device for calculating dynamic filtration of carbon dioxide fracturing fracture |
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| CN110173251A (en) * | 2019-06-26 | 2019-08-27 | 中国石油集团渤海钻探工程有限公司 | Compact oil reservoir CO2Auxiliary energy-storage imbibition fracturing process |
| CN112253066A (en) * | 2019-07-03 | 2021-01-22 | 中国石油化工股份有限公司 | Method for improving fracture complexity and transformation volume of deep shale gas |
| CN110513094A (en) * | 2019-09-06 | 2019-11-29 | 陕西延长石油（集团）有限责任公司 | A kind of Variable Composition carbon dioxide acid fracturing method |
| CN110513094B (en) * | 2019-09-06 | 2021-12-14 | 陕西延长石油（集团）有限责任公司 | Variable-concentration carbon dioxide acid fracturing method |
| CN112990629B (en) * | 2019-12-17 | 2024-03-29 | 中国石油化工股份有限公司 | Unconventional oil and gas reservoir exploitation method and unconventional oil and gas reservoir exploitation system |
| CN112990629A (en) * | 2019-12-17 | 2021-06-18 | 中国石油化工股份有限公司 | Unconventional oil and gas reservoir exploitation method and system |
| CN114458268A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Supercritical CO2Soaking-assisted hydraulic fracturing rock breaking method |
| CN112832728A (en) * | 2021-01-08 | 2021-05-25 | 中国矿业大学 | Shale reservoir fracturing method based on methane multistage combustion and explosion |
| CN112832728B (en) * | 2021-01-08 | 2022-03-18 | 中国矿业大学 | Shale reservoir fracturing method based on methane multistage combustion and explosion |
| CN112761598B (en) * | 2021-02-05 | 2022-04-01 | 西南石油大学 | Method and device for calculating dynamic filtration of carbon dioxide fracturing fracture |
| CN112761598A (en) * | 2021-02-05 | 2021-05-07 | 西南石油大学 | Method and device for calculating dynamic filtration of carbon dioxide fracturing fracture |
| CN113027407B (en) * | 2021-04-21 | 2022-04-05 | 太原理工大学 | Foam-gas composite staged fracturing method for stratum |
| CN113027407A (en) * | 2021-04-21 | 2021-06-25 | 太原理工大学 | Foam-gas composite staged fracturing method for stratum |
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