CN109915101A - A kind of full fracture guide fracturing technology - Google Patents
A kind of full fracture guide fracturing technology Download PDFInfo
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- CN109915101A CN109915101A CN201711324200.2A CN201711324200A CN109915101A CN 109915101 A CN109915101 A CN 109915101A CN 201711324200 A CN201711324200 A CN 201711324200A CN 109915101 A CN109915101 A CN 109915101A
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Abstract
Full fracture guide fracturing technique is the fracturing reform new technology that a kind of gull water conservancy diversion area realization crack supports entirely.In terms of oil-gas reservoir is transformed, conventional fracturing technique there are the problem of: fracture support is uneven, and the effective water conservancy diversion area in crack is insufficient, and permeability injury is higher etc., and these problems restrict oil-gas reservoir effect of increasing production.Full fracture guide fracturing technique solves the problems, such as that conventional fracturing technique exists, use low viscous fracturing fluid system, reduce sinking speed of the proppant in fracturing fluid, improve the supporting efficiency of proppant, realize that crack supports entirely, meanwhile construction pump injection pressure power is effectively reduced using low frictional resistance fracturing fluid system, and reduce prepad fluid dosage.The novel fracturing technique improves pressure break efficiency, increases oil field development benefit.Field application shows that full fracture guide fracturing technique can significantly change the shortcoming of conventional fracturing technique, reduces pressure break input cost, hence it is evident that improves fracturing effect, has broad application prospects.
Description
Technical field
It is a kind of to realize full fracture guide fracturing technology the present invention relates to a kind of fracturing technology.
Background technique
Hydraulic fracturing has become necessity of all kinds of unconventional reservoir exploitations such as conventional oil gas reservoir, coal bed gas and shale gas
Means.Due to material property limitation, the deficiency of suggestion of process design, cause conventional pressure break comprehensive benefit undesirable.The present inventor
It observed, studied for a long time, the drawbacks of analysis finds prior art, the mainly effective water conservancy diversion area in crack is insufficient.Existing pressure break makes
Proppant is generally quartz sand and haydite, since the apparent density of this kind of proppant is generally in 2.6g/cm3-3.3g/cm3It
Between, easily in density 1.012g/cm3Fracturing fluid in settle.So in pressing crack construction, carry the fracturing fluid of proppant into
During entering formation fracture, the proppant to play a supportive role is gradually settled, and is weakened on the top in crack and end supporting role,
Cause the ratio between effective supporting crack and dynamic crack less than normal, the effective water conservancy diversion area in crack is insufficient, reduces fracturing effect；Its
Secondary is existing crosslinked gel high viscosity fracturing fluid system using a large amount of thickeners and multiple additives, will cause the pollution on stratum,
Permeability is reduced, in-place permeability injury is bigger than normal, influences fracturing effect.
For overcome the deficiencies in the prior art, it is desirable to provide proppant suspends fortune entirely in fracturing fluid in a kind of fracturing process
The technical solution of shifting, realizing reduces environmental pollution, improves fracturing effect.
Summary of the invention
It is an object of the present invention to provide a kind of effective means of oil-gas reservoir volume increase, solve sedimentation of the proppant in fracturing process
Problem realizes proppant full suspension conveying in fracturing liquid, reaches the technical goal that hydraulic fracture supports entirely, improves pressure break effect
Fruit.The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of full fracture guide hydraulic fracturing process, the technique comprise the following steps:
(1) fracturing fluid for suspending and carrying proppant is prepared；
(2) fracturing fluid and proppant injection stratum are formed into full supporting crack.
In first optimal technical scheme provided by the invention, the density of the fracturing fluid is 1.01g/cm3-1.35g/cm3With
Viscosity is 5.0mPas-50.0mPas.
In second optimal technical scheme provided by the invention, the density of the proppant is 1.01g/cm3-1.45g/cm3。
In third optimal technical scheme provided by the invention, the density contrast between fracturing fluid and proppant
0.00g/cm3- 0.10g/cm3。
In 4th optimal technical scheme provided by the invention, the fracturing fluid includes by mass percentage:
The one or more compounds selected from polyacrylamide, guanidine glue, hydroxypropyl guar, carboxy-methyl hydroxy propyl guanidine glue
0.3 ‰ -2.5 ‰ drag reducer of composition；
The potassium chloride of 1.0%-2.5%；
Alkyl sulfate, alkylsulfonate, select in betaine type the 0.5 ‰ -1.5 ‰ of one or more compounds
Cleanup additive is 1.；
From 1. quaternary ammonium salt cationic salt, 2. oligomeric quaternary ammonium salt cationic salt, 3. organosilan rouge, 4. trimethyl allyl chlorine
Change 0.5 ‰ -1.5 ‰ clay stabilizer of the one or more compounds selected in ammonium；
From 1. methacrylaldehyde, 2. aliphatic amine type quaternary ammonium salt, 3. select in aldehydes the 0.5 ‰ -1.5 ‰ of one or more compositions
Fungicide.
In 5th optimal technical scheme provided by the invention, the fracturing fluid includes following groups by mass percentage
Part: thickener 1. guanidine glue, 2. hydroxypropyl guar, 3. select one or more, dosage 2.5 ‰-in carboxy-methyl hydroxy propyl guanidine glue
4.5‰；Sodium nitrate, dosage 1.0%-50.0%；Cleanup additive, from 1. alkyl sulfate, 2. alkylsulfonate, 3. in betaine type
That selects is one or more, dosage 0.5 ‰ -1.5 ‰, clay stabilizer from 1. quaternary ammonium salt cationic salt, 2. oligomeric quaternary ammonium salt sun
4. ion salt, 3. organosilan rouge are selected in trimethylallylammonium chloride one or more, dosage 0.5 ‰ -1.5 ‰ kills
Microbial inoculum from 1. methacrylaldehyde, 2. aliphatic amine type quaternary ammonium salt, 3. select one or more, dosage 0.5 ‰ -1.5 ‰ in aldehydes.
In 6th optimal technical scheme provided by the invention, it is not small not less than 0.8, circularity that the proppant is selected from sphericity
In 0.8, density 1.10g/cm3-1.45g/cm3With percentage of damage less than 5% (69MPa).
In 7th optimal technical scheme provided by the invention, the proppant is to be not less than 0.9, circularity not selected from sphericity
Less than 0.9, percentage of damage less than 3% (86MPa).
With immediate prior art ratio, technical solution provided by the invention has following excellent effect:
(1) transfer efficiency of proppant is improved.Reduce proppant and fracturing fluid density contrast, it is ensured that proppant is in fracturing process
In be in suspended state, be changed into sediment transport mode by the sedimentation in conventional pressure break-whaleback formula floated, improve sediment transport efficiency.
(2) proppant usage amount is reduced.Proppant low-density and high intensity is utilized in technical solution provided by the invention
The characteristic of (meeting effectively closed stress 69MPa), percentage of damage low (under the conditions of 69MPa, percentage of damage≤1.5%), in the complete of pressure break
In the process, with opposite reduced proppant dosage (reducing 30%-50% relative to conventional pressure break), the full laying in crack is obtained,
And fracturing effect is improved simultaneously.
(3) reservoir damage is reduced.The present invention carries proppant with the fracturing fluid of 5mPas-50mPas viscosity, realizes
The even suspension of proppant reduces the usage amount of chemical material and the dosage of prepad fluid, not only reduces fracturing fluid to storage
The injury of layer, and condition is provided to return drain processing and recycling.
(4) combined support agent optimizes fracture support section
The combined support agent mode of different-grain diameter is used for fracturing technology, the distal site in crack is made to can get such as 40 mesh-
The support of the relatively small particle proppant of 70 mesh ranks, and the larger of such as -40 mesh rank of 14 mesh is obtained in the nearly wellbore location in crack
Partial size proppant supports major fracture, realizes major fracture, branch's seam and microcrack and is supported respectively with big partial size and small particle, thus
Flow conductivity needed for meeting volume increase realizes full seam support, is distributed the flow conductivity of hydraulic fracture section more reasonable.
(5) construction pump injection pressure power is reduced
The low viscous fracturing fluid system of technical solution provided by the invention, viscosity 5mPas-50mPas, this low viscosity
Fracturing fluid system has the technical characteristic of low frictional resistance, and construction friction drag drag reducing efficiency can reach 60%-75%, joins with same construction
Energy consumption needed for fracturing unit in fracturing process can be reduced 10%-20% by the conventional fracturing technology ratio under said conditions.
Detailed description of the invention:
Fig. 1 low-density propping agent sample
Fig. 2 low-density propping agent full suspended state in fracturing fluid
The part Fig. 3 supporting crack and full seam supporting crack comparison schematic diagram
Fig. 4 routine pressure break and full fracture guide pressure break supporting crack form contrast schematic diagram
Specific embodiment
It is elaborated, but should not be understood as to specific technical solution provided by the invention in a manner of specific embodiment below
Limiting the scope of the present invention:
Preparing fracturing fluid:
1 is added methacrylaldehyde in tank, and mass concentration 0.5 ‰ recycles 5min, is uniformly mixed.
2 keep circulation discharge capacity 4.0m3/min-4.5m3/ min, at the uniform velocity addition potassium chloride, mass concentration 2% take after 10min
Water sample test density, if sample density is in 1.015g/cm3-1.020g/cm3It is qualification in range, otherwise whether checks pot bottom
There is solid potassium chloride to deposit and continue cycling through, until detection sample density is in 1.015g/cm3-1.020g/cm3It is conjunction in range
Lattice.
3 continue cycling through, discharge capacity 4.0m3/min-4.5m3/ min, is added hydroxypropyl guar, mass concentration 2.5 ‰, and control is inhaled
Enter 8 kilograms/min of speed, dissolve hydroxypropyl guar powder sufficiently, without flake, addition, which finishes, continues cycling through 10min, sampling inspection
Viscosimetric, at 20 DEG C, 170sec-1Under the conditions of range of viscosities 12mPas-15mPas be qualification, otherwise continue cycling through until viscous
Until spending range qualification.
4 keep circulation discharge capacity 4.0m3/min-4.5m3Alkylsulfonate, mass concentration 1.0 ‰, circulation is added in/min
10min。
5 keep circulation discharge capacity 4.0m3/min-4.5m3/ min, is added oligomeric quaternary ammonium salt cationic salt, mass concentration 1.0 ‰,
10min is recycled, into next step program.
6 keep circulation discharge capacity 4.0m3/min-4.5m3/ min, sample detection liquid viscosity, at 20 DEG C, 170sec-1Condition
Lower range of viscosities 15mPas-18mPas is qualification, is otherwise continued cycling through until range of viscosities qualification.
7 terminations of pumping, fracturing fluid preparation finish.
Embodiment 1:
It is 1.05g/ by the density enumerated in fracturing fluid and table that following table formula is prepared according to full seam water conservancy diversion technique requirement
cm3-2.35g/ cm3Proppant is used in 10 mouthfuls of different oil/gas well layers, obtains higher frscturing effect.
10 causes for gossip test well construction parameter pressure break formula of liquid and use proppant
Well construction parameter and effect of increasing production are tested in 10 causes for gossip
Embodiment 2
Target well:
It is 1.05g/ by the apparent density enumerated in fracturing fluid and table that following table formula is prepared according to full seam water conservancy diversion technique requirement
Cc proppant is applied for Su Lige block Soviet Union XXX (gas well) pressing crack construction.
Revive XXX (target well) pressure break formula of liquid with use proppant
In November, 2016, Soviet Union's XXX well implement pressure break, inject into well total amount of liquid 384m3, inject propping of subterranean formations agent 32.8m3。
Compare well:
It is 3.10g/ by the apparent density enumerated in fracturing fluid and table that following table formula is prepared according to conventional fracturing technology requirement
cm3Proppant, which is applied, compares well pressing crack construction for Su Lige block.
It compares well fracturing fluid formula and uses proppant
In November, 2016, comparison well implement pressure break, inject into well total amount of liquid 392m3, inject propping of subterranean formations agent 35.0m3。
Target well daily gas 15150m after pressure3, compare well (conventional pressure break) daily gas 11650m3, gas yield increase by 30%.
Finally it should be noted that the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described the invention in detail referring to above-described embodiment, it should be understood by a person of ordinary skill in the art that still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement, should all cover in present claims range.
Claims (8)
1. a kind of full fracture guide hydraulic fracturing process, the technique comprise the following steps:
(1) fracturing fluid for suspending and carrying proppant is prepared；
(2) fracturing fluid and load fluid injection stratum are formed into full supporting crack.
2. a kind of full fracture guide fracturing technology described in claim 1, it is characterised in that the density of the fracturing fluid is 1.01g/
cm3-1.35g/cm3It is 5.0mPas-50.0mPas with viscosity.
3. a kind of full fracture guide fracturing technology described in claim 1, it is characterised in that the density of the proppant is 1.01g/
cm3-1.45g/cm3。
4. a kind of full fracture guide fracturing technology, the density contrast between the fracturing fluid and proppant described in claim 1
0.00g/cm3-0.10g/cm3。
5. a kind of full fracture guide fracturing technology as claimed in claim 2, the fracturing fluid includes by mass percentage
Following components: drag reducer, from 1. polyacrylamide, 2. guanidine glue, 3. hydroxypropyl guar, 4. select in carboxy-methyl hydroxy propyl guanidine glue
It is one or more, dosage 0.3 ‰ -2.5 ‰；Potassium chloride, 1.0%-2.5%；Cleanup additive, from 1. alkyl sulfate, 2. alkyl sulphur
3. hydrochlorate selects one or more, dosage 0.5 ‰ -1.5 ‰ in betaine type；Clay stabilizer, from 1. quaternary ammonium salt cationic
Salt, 2. oligomeric quaternary ammonium salt cationic salt, 3. organosilan rouge, 4. select in trimethylallylammonium chloride it is one or more,
Dosage 0.5 ‰ -1.5 ‰；Fungicide, from 1. methacrylaldehyde, 2. aliphatic amine type quaternary ammonium salt, 3. select in aldehydes it is one or more,
Dosage 0.5 ‰ -1.5 ‰.
6. a kind of full fracture guide fracturing technology as claimed in claim 2, the fracturing fluid includes by mass percentage
Following components: thickener 1. guanidine glue, 2. hydroxypropyl guar, 3. select one or more, dosage in carboxy-methyl hydroxy propyl guanidine glue
2.5‰-4.5‰；Sodium nitrate, dosage 1.0%-50.0%；Cleanup additive, from 1. alkyl sulfate, 2. alkylsulfonate, 3. beet
That selects in alkaline is one or more, dosage 0.5 ‰ -1.5 ‰, and clay stabilizer is from 1. quaternary ammonium salt cationic salt, 2. oligomeric season
4. ammonium salt cationic salts, 3. organosilan rouge select one or more, dosage 0.5 ‰-in trimethylallylammonium chloride
1.5 ‰, fungicide from 1. methacrylaldehyde, 2. aliphatic amine type quaternary ammonium salt, 3. select one or more, dosage 0.5 ‰-in aldehydes
1.5‰。
7. a kind of full fracture guide fracturing technology as claimed in claim 2, the proppant is selected from sphericity not less than 0.8, circle
Degree is not less than 0.8, density 1.10g/cm3-1.45g/cm3With percentage of damage less than 5% (69MPa).
8. a kind of full fracture guide fracturing technology as claimed in claim 2, the proppant be selected from sphericity not less than 0.9,
Circularity is not less than 0.9, percentage of damage less than 3% (86MPa).
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| CN112280549A (en) * | 2020-09-28 | 2021-01-29 | 长江大学 | Nano emulsion and fracturing method |
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| CN112280549A (en) * | 2020-09-28 | 2021-01-29 | 长江大学 | Nano emulsion and fracturing method |
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Application publication date: 20190621 |