CN109296350A - A kind of overstocked cracking method of the seam dictyosome of carbonate reservoir - Google Patents
A kind of overstocked cracking method of the seam dictyosome of carbonate reservoir Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 20
- 238000005336 cracking Methods 0.000 title claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000005530 etching Methods 0.000 claims abstract description 19
- 230000009466 transformation Effects 0.000 claims abstract description 13
- 230000000977 initiatory effect Effects 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 16
- 206010017076 Fracture Diseases 0.000 description 34
- 208000010392 Bone Fractures Diseases 0.000 description 33
- 239000007789 gas Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 208000013201 Stress fracture Diseases 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007634 remodeling Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
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- 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
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Sealing Material Composition (AREA)
Abstract
The present invention relates to a kind of seam dictyosomes of carbonate reservoir to overstock cracking method.The volume fracturing method is the following steps are included: 1) initial crack initiation: carrying out seam to by injection slippery water in pretreated stratum, is then injected into gel acid fracture and carries out acid etching transformation, increase seam length；2) temporarily stifled in seam: the microcrack to be formed being transformed acid etching using slippery water carrying diverting agent and is temporarily blocked up；3) it turns to acid fracturing: injecting gel acid by temporarily stifled stratum, after gel acid replaces diverting agent in place, turn to other positions and carry out acid etching transformation；4) slippery water seam: injection slippery water carries out seam in the stratum being transformed to step 3) by acid etching；5) expand seam support: injecting load fluid into the stratum after step 4) seam and be supported.This method can effectively reduce fluid loss, realizes " control is close to expand far ", can form secondary seam abundant, improve the connectivity with major fracture, intrinsic fracture, and then improve the correctional effect of volume fracturing.
Description
Technical field
The invention belongs to the volume fracturings of shale gas reservoir, and field is transformed, and in particular to a kind of seam net of carbonate reservoir
Volume fracturing method.
Background technique
The features such as shale gas reservoir has porosity, permeability low, and gas occurrence status is various, generally requires by waterpower
Cost-effective exploitation could be obtained after pressure break reservoir reconstruction measure.Volume fracturing be to reservoir on length three-dimensional
Modernization overlay is carried out, to achieve the purpose that increase the seepage area and flow conductivity of reservoir.
Notification number is that the Chinese patent of CN105275446B discloses a kind of volume fracturing remodeling method comprising: injection
Low viscous fracturing liquid reinjects so that the microcrack of near wellbore formation is saturated by the low viscous fracturing liquid of leak-off comprising small particle branch
The mulling fracturing fluid for supportting agent reduces near-wellbore effect, it is ensured that form main force crack for blocking microcrack and reducing bending friction
Predominant pathway.It is alternately injecting into high viscosity fracturing fluid body and low viscous fracturing liquid, keeps the major fracture generated remote near wellbore formation
Well stratum constantly extends and extends, and expected length is connected to and reached with far field intrinsic fracture and weak top-crack, is also infused therebetween
Enter the mulling fracturing fluid comprising medium grain size proppant to support major fracture；Injection includes the mulling fracturing fluid of big partial size proppant
To complete sealing support.
Existing volume fracturing method by injecting different fracturing fluid systems in an alternating fashion in hydraulic fracturing process,
To achieve the purpose that enhance the swept volume of hydraulic fracturing.This method pays attention to the fracturing reform of major fracture, the shape of secondary seam
At limited, it be unfavorable for being formed between major fracture, intrinsic fracture and be well connected to, volume fracturing correctional effect is caused still to need to be mentioned
It is high.
Summary of the invention
The purpose of the present invention is to provide a kind of seam dictyosomes of carbonate reservoir to overstock cracking method, to solve existing side
The forming amount of secondary seam existing for method is few, the problem of volume fracturing correctional effect difference.
To achieve the above object, the seam dictyosome of carbonate reservoir of the invention overstocks technical solution used by cracking method
It is:
A kind of overstocked cracking method of the seam dictyosome of carbonate reservoir, comprising the following steps:
1) initial crack initiation: seam is carried out to by injection slippery water in pretreated stratum, is then injected into gel acid counterincision
Seam carries out acid etching transformation, increases seam length；
2) temporarily stifled in seam: the microcrack to be formed being transformed acid etching using slippery water carrying diverting agent and is temporarily blocked up；
3) it turns to acid fracturing: injecting gel acid by temporarily stifled stratum, after gel acid replaces diverting agent in place, turn to
Other positions carry out acid etching transformation；
4) slippery water seam: injection slippery water carries out seam in the stratum being transformed to step 3) by acid etching；
5) expand seam support: injecting load fluid into the stratum after step 4) seam and be supported.
The seam dictyosome of carbonate reservoir provided by the invention overstocks cracking method, realizes after pressure break major fracture is formed, and throws
Enter diverting agent and temporarily block microcrack, improve net pressure in stitching, on the basis of intrinsic fracture and man-made fracture, is formed complicated
Net system is stitched, is finally stuffed entirely with crack using load fluid, reaches seam net system and effectively supports comprehensively.This method can effectively drop
Low fluid loss is realized " control close expand remote ", and secondary seam abundant can be formed, and improves the connectivity with major fracture, intrinsic fracture,
And then improve the correctional effect of volume fracturing.
In step 1), the pretreatment is that preposition acid is injected into stratum, to reduce the broken of Kong Zhaoxia and near wellbore formation
Split pressure.Stratum is pre-processed by using above-mentioned means, can effectively reduce the rupture pressure of Kong Zhaoxia and near wellbore formation
Power facilitates the progress of subsequent step.
It includes that alternately injection slippery water and microcrack block slug (small particle slug) that the injection slippery water, which carries out seam,.
Microcrack blocks slug and is made of slippery water and small particle proppant, and mass content of the small particle proppant in slug is 2-
3%.The partial size of small particle proppant is 70-140 mesh.Small particle slug can block reservoir micro-fractures and reduce fracturing fluid drop filter,
Can leak-off further be reduced in such a way that liquid nitrogen is with note.It is handled using aforesaid way, blocks slug using microcrack
It realizes drop filter, denudes crack wall surface, reduce construction friction, reduce near-wellbore effect.
Acid etching transformation is carried out using gel acid, cooperates preposition smooth water pretreatment, the reaction of acid solution and rock can be reduced
Speed increases acid etching seam length.
In step 2), the diverting agent includes fiber diverting agent and particle diverting agent, fiber diverting agent, particle diverting agent
Mass ratio is (50-60): (100-150).Using this, temporarily stifled mode can get good temporarily stifled effect, such as in DaNiuDi gas field
The lower Gu temporary stall of DPF-203 well first segment is constructed to acid fracturing, and fiber diverting agent 50kg, particle diverting agent 100kg is added, temporarily stifled to rise
12.6mPa is pressed, the temporary stall of second segment is constructed to acid fracturing, and fiber diverting agent 50kg is added, and particle diverting agent 100kg is added, temporarily stifled
After boost 16.7mPa, temporarily stifled effect is obvious.
The step is mainly using stifled reforming technology temporary in stitching, and on the one hand stitching interior temporarily block up reduces fluid loss, " control is closely for realization
Expand remote ", on the other hand increase net pressure in stitching, can create conditions for subsequent steering acid fracturing, promote more acidizing wormholes, acid
The generation of the secondary fractures such as microcrack is lost, improves crack complexity, and then preferably link up major fracture and intrinsic fracture, the company of being formed
Straight joint net.
Step 3) predominantly turns to acid fracturing process, step 2) it is temporary stifled on the basis of, steering acid fracturing process leak-off is few, in seam
Net pressure is high, contributes to form preliminary complicated seam net system, creates good item for complicated seam the perfect of net system of step 4)
Part.
In step 4), it includes that alternately injection slippery water and microcrack block slug that the injection slippery water, which carries out seam,.It should
The main function of step 4) is to be injected on the basis of the preliminary seam net system that step 3) is formed using slippery water cooperation slug,
Fracture length can be effectively improved, seam effect is improved, ultimately forms complicated seam net system.
In step 5), the injection load fluid includes first injecting load fluid opposite joint host's body containing medium grain size proppant
It is supported, the later period, the load fluid in hot pursuit containing big partial size proppant was supported sealing.40-70 may be selected in medium grain size
30-50 mesh may be selected in mesh, big partial size.After above-mentioned expansion seam support, seam net system can be kept to stablize, optimization seam net system is led
Stream ability.Slippery water is used to replace load fluid in place after injection load fluid.
Preferably, step 5) expands after seam support, completes the fracturing reform of the perforated interval；It further include temporarily blocking up step between stitching,
Temporarily blocking up between the seam is to put into temporary plugging ball into the perforated interval for completing fracturing reform, is then repeated in step 1)-step 5), right
Another perforated interval on same fracturing section carries out fracturing reform.It is temporarily blocked up between temporarily blocking up and stitch in bonding crack, crack can be promoted to turn to, structure
Networking lattice Fracture Systems.Practical application effect, which shows temporarily to block up between temporarily blocking up and stitch in bonding crack, presses each perforated interval of horizontal well
Transformation is split, intrinsic fracture and man-made fracture can be made around pit shaft to interlock branch, man-made fracture cubic network is formed, realize in reservoir
The maximization of fracturing fracture swept volume makes the seepage flow volume of well after pressure break be multiplied, to reach the mesh of oil gas field volume increase
's.
Temporarily stifled in seam is the end that chinks, and makes crack stop extending, increases net pressure in stitching, opens intrinsic fracture；Between seam
Temporarily stifled is to block crack sealing using temporary plugging ball, then another preforation tunnel of pressure break, temporarily blocks up between seam and realizes the transformations stitched in section more,
The validity of perforated interval transformation can be effectively improved.
During the above volume fracturing, initial crack initiation step is injected using huge discharge, is stitched interior temporarily stifled step and is used small displacement
Injection is turned to acid fracturing step and is injected using medium discharge capacity, and slippery water seam step and expansion seam support step are all made of huge discharge note
Enter.Huge discharge injection is generally 8-10m3/ min, medium discharge capacity injection are generally 5-8m3/ min, small displacement injection are generally 1-
4m3/min.It is using the advantages of above injection mode, huge discharge injects slippery water seam and expands seam support convenient for improving crack
Length improves seam effect, to form complicated seam net, realizes the maximization of fracturing fracture swept volume in reservoir；Medium row
Amount injection turns to acid convenient for forming preliminary complicated seam net system, improves acid-etched fracture pore volume, increases seepage area；Float
Amount injection stitch in diverting agent be convenient for make slippery water carry diverting agent migrate to designated position, thus acid etching is transformed to be formed it is micro-
Crack is temporarily blocked up.
Closing well 30min after volume fracturing, guarantee form higher acid corrosion fracture, and construction is opened after terminating 30min
Beginning open flow, as far as possible shortening closed-in time, to make full use of acid-rock reaction to form CO2Self-energy, conducive to the row of returning.
Detailed description of the invention
Fig. 1 is that the seam dictyosome of carbonate reservoir of the invention overstocks the work flow diagram of cracking method embodiment；
Fig. 2 is that the conventional acid fracturing of the prior art is formed by the extension simulation drawing in crack；
Fig. 3 is that the method for the embodiment of the present invention is formed by the extension simulation drawing in crack.
Specific embodiment
Embodiments of the present invention are described further combined with specific embodiments below.Below to the injection in embodiment
Liquid is briefly described.Each component percentage in injection liquid is weight percentage.
Slippery water is made of the water of 0.06% friction reducer, 0.3% expansion-resisting agent, 0.1% cleanup additive and surplus, is had low viscous
Characteristic.
Slug is made of slippery water and 70/140 mesh powder pottery, and the quality accounting of powder pottery is 2-3%.
Preposition acid, by 25%HCl, 1.5% corrosion inhibiter, 0.15% ferrous stability, 1.0% cleanup additive, 0.5% blistering
Agent and excess water composition.
Gel acid, by 25%HCl, 1.5% corrosion inhibiter, 0.15% ferrous stability, 1.0% cleanup additive, 0.5% blistering
Agent, 0.5% thickener and excess water composition.
Load fluid is made of 0.3% thickening agent, 0.3% expansion-resisting agent, 0.1% cleanup additive and excess water.
In the above injection liquid, slippery water, slug, preposition acid, gel acid, load fluid are the prior art, can be used
The similar product of the prior art is replaced, or is prepared according to above-mentioned composition, involved in friction reducer, prevent it is swollen
The auxiliary agents such as agent, cleanup additive are commercially available customary commercial.Fiber diverting agent, particle diverting agent, temporary plugging ball have been used in pressure break respectively
Equal diverting agents, particle diverting agent are YX-ZDJ-S90 water solubility temporary blocking poawer end, are purchased from Xi'an You Xing Energy Science Co., Ltd；?
Grain diverting agent, fiber diverting agent, temporary plugging ball performance indicator as shown in table 1, table 2, table 3.
1 particle diverting agent performance indicator of table
2 fiber diverting agent performance indicator of table
| Serial number | Measurement item | Technical indicator |
| 1 | Appearance | White or faint yellow filament shape |
| 2 | Length, mm | 6±1 |
| 3 | Dispersibility | It is evenly dispersed after stirring 15s |
| 4 | Bearing strength, MPa | ≥50 |
| 5 | Solubility property (90 DEG C) | 16h (dissolution rate >=80%) |
3 temporary plugging ball performance indicator of table
| Serial number | Measurement item | Technical indicator |
| 1 | Appearance | Grey or faint yellow bead |
| 2 | Density, g/cm3 | 1.20±0.10 |
| 3 | Diameter | 11mm, 13mm |
| 4 | Bearing strength, MPa | ≥50 |
| 5 | Solubility property (90 DEG C) | 7d (dissolution rate >=80%) |
The seam dictyosome of carbonate reservoir of the invention overstocks the embodiment of cracking method, with the storage of DaNiuDi gas field carbonate rock
It is illustrated for layer, the region carbonate reservoir fracture development, brittleness with higher, reservoir quartz content is lower, only
The 0.6%-1.1% of total mineral content is accounted for, but the content of calcite has accounted for 98% or more, and calcite is with preferable crisp
Property, the reservoir rich in brittle mineral is conducive to generate complicated seam net, work flow diagram such as Fig. 1 institute of specific fracturing reform process
Show, using following steps:
1) pretreatment stage: with 1m3The discharge capacity of/min injects the preposition acid of 1/3 times of wellbore volume, to clear up pit shaft and drop
The fracture pressure of low Kong Zhaoxia and near wellbore formation.Later with 4m3The discharge capacity of/min injects slippery water, and preposition acid is replaced to penetrating
Hole hole position, so that preposition acid be made sufficiently to impregnate preforation tunnel and near wellbore zone.
2) the initial crack initiation stage: after preposition acid is completely into stratum, with huge discharge (10m3/ min) alternately inject it is smooth
Water and slug, slug blocks reservoir micro-fractures in slippery water seam, while denuding crack wall surface, has drop filter, reduces construction
Frictional resistance effect, and near wellbore formation is made to be saturated a part of slippery water in advance inside the microcrack that the initial crack initiation stage is formed, it reduces
Near-wellbore effect.
3) the acid filling stage: with huge discharge (10m3/ min) injection gel acid, with etch step 2) slippery water link up fine fisssure
Seam increases acid etching seam length.
4) slippery water temporarily blocks up the stage: using small displacement (2-4m3/ min) slippery water carry fiber diverting agent temporarily block up step 3)
The acid etching microcrack of formation, makes to stitch interior net pressure and deflects, and forms secondary seam, links up intrinsic fracture, improves major fracture and day
The connectivity of right crack and secondary seam.Additional proportion of the fiber diverting agent in slippery water is 5%.
5) sour injection stage is turned to: with medium discharge capacity (5m3/ min) injection gel acid is to realize steering acid fracturing, after making temporary block up
Other positions obtain acid etching, increase the EFFECTIVE RANGE of acid solution, form complicated acid-etched fracture.
6) slippery water, slug replace injection stage: with huge discharge (10m3/ min) slippery water and slug are alternately injected, to acid
Erosion crack is transformed, and obtains transformation acid-etched fracture.
7) pressure break expands seam driving phase: injection load fluid is supported the transformation acid-etched fracture that step 6) is formed, and injects
When, first the medium grain size proppant in high intensity of 40/70 mesh of a large amount of injections, pressure resistance 52mPa, later period are hot on the trail of 30/50 mesh, pressure resistance
The high-granularity high-strength proppant of 52mPa improves the fracture condudtiviy of nearly well acid etching sealing；Finally injection is not less than one times of well
The slippery water of cylinder volume is replaced, and the fracturing reform of the perforated interval is completed.
8) temporarily block up between stitching: temporary plugging ball blocks the perforated interval that step 7) completes fracturing reform between investment seam, repeats step 1)-step
The rapid fracturing reform that another perforated interval 7) is carried out on same fracturing section.
It realizes that the seam net volume fracturing of DPF-205 well is transformed using the method for the present embodiment, " being segmented more clusters " is used to penetrate
Hole, each segmentation (fracturing section) a length of 150m contain more cluster cracks thereon, and the span in every cluster crack is 0.45-0.77m, adjacent
20-30m is divided between two cluster cracks.Using blocking in seam, section internal fissure is blocked using between seam, is sequentially completed this point in single cluster crack
The fracturing reform of section, specific pump note technique are as shown in table 4.
The specific acid fracturing construction pump note technique of table 4DPF-205 well
Table 5 is illustrated DaNiuDi gas field part of horizontal well and is overstock using conventional acidfracturing treatment and using the seam dictyosome of embodiment
Split the construction effect comparative situation of 2 mouthfuls of wells (DPF-203 well, DPF-205 well) after remodeling method is transformed.
5 horizontal well routine acid fracturing of table and seam net volume fracturing Contrast on effect
As can be seen from Table 5, after volume stitches net fracturing reform, fracture condudtiviy increases for DPF-203 well, DPF-205 well
Add, volume increase is obvious.
Fig. 2 and Fig. 3 respectively illustrates on DP-2 well the extension simulation drawing in certain section of crack on conventional pressure break and DPF-203 well.
As can be seen that fracture length, support seam height are all than conventional acid fracturing method after overstocking cracking method transformation using the seam dictyosome of embodiment
It is significantly improved, correctional effect is obvious.
Open-flow capacity is 8.2 ten thousand sides/day after DPF-203 well pressure, and the DPT-112 well open-flow capacity of adjacent identical layer position is
60000 sides/day, open-flow capacity is 7.8 ten thousand sides/day after year-on-year increase of production 26%, DPF-205 well pressure, and offset well DP88S well is without hindrance
Flow is 0.545 ten thousand sides/day, and DP107T well open-flow capacity is 4.298 ten thousand sides/day, and open-flow capacity significantly improves after pressure, the technology
Success of the test is promoted other than in addition in DaNiuDi gas field, is also applied to adjacent gas field, low to develop the low hole in the other areas in China
Permeability gas reservoir provides technological guidance and beneficial experience, it is contemplated that will generate huge economic benefit and social benefit.
Claims (8)
1. a kind of seam dictyosome of carbonate reservoir overstocks cracking method, which comprises the following steps:
1) initial crack initiation: carrying out seam to by injection slippery water in pretreated stratum, be then injected into gel acid fracture into
The transformation of row acid etching increases seam length；
2) temporarily stifled in seam: the microcrack to be formed being transformed acid etching using slippery water carrying diverting agent and is temporarily blocked up；
3) it turns to acid fracturing: injecting gel acid after gel acid replaces diverting agent in place by temporarily stifled stratum and turn to other
Position carries out acid etching transformation；
4) slippery water seam: injection slippery water carries out seam in the stratum being transformed to step 3) by acid etching；
5) expand seam support: injecting load fluid into the stratum after step 4) seam and be supported.
2. the seam dictyosome of carbonate reservoir as described in claim 1 overstocks cracking method, which is characterized in that in step 1), institute
Stating pretreatment is that preposition acid is injected into stratum, to reduce the fracture pressure of Kong Zhaoxia and near wellbore formation.
3. the seam dictyosome of carbonate reservoir as described in claim 1 overstocks cracking method, which is characterized in that in step 1), institute
Stating injection slippery water and carrying out seam includes that alternately injection slippery water and microcrack block slug.
4. the seam dictyosome of carbonate reservoir as described in claim 1 overstocks cracking method, which is characterized in that in step 2), institute
Stating diverting agent includes fiber diverting agent and particle diverting agent, fiber diverting agent, particle diverting agent mass ratio be (50-60):
(100-150)。
5. the seam dictyosome of carbonate reservoir as described in claim 1 overstocks cracking method, which is characterized in that in step 4), institute
Stating injection slippery water and carrying out seam includes that alternately injection slippery water and microcrack block slug.
6. the seam dictyosome of carbonate reservoir as described in claim 1 overstocks cracking method, which is characterized in that in step 5), institute
Stating injection load fluid includes first injecting load fluid opposite joint host's body containing medium grain size proppant to be supported, and the later period, which is hot on the trail of, to be contained
There is the load fluid of big partial size proppant to be supported sealing.
7. the seam dictyosome of carbonate reservoir as described in claim 1 overstocks cracking method, which is characterized in that step 5) expands seam branch
After support, the fracturing reform of the perforated interval is completed；It further include that step is temporarily blocked up between stitching, temporarily blocking up between the seam is to completion fracturing reform
Perforated interval in put into temporary plugging ball, be then repeated in step 1)-step 5), on same fracturing section another perforated interval carry out
Fracturing reform.
8. the seam dictyosome such as carbonate reservoir of any of claims 1-7 overstocks cracking method, which is characterized in that just
Beginning crack initiation step is injected using huge discharge, is stitched interior temporarily stifled step and is injected using small displacement, turns to acid fracturing step using medium discharge capacity
Injection, slippery water seam step and expansion seam support step are all made of huge discharge injection.
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| CN201811224714.5A CN109296350B (en) | 2018-10-19 | 2018-10-19 | Fracture network volume fracturing method for carbonate reservoir |
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| CN201811224714.5A CN109296350B (en) | 2018-10-19 | 2018-10-19 | Fracture network volume fracturing method for carbonate reservoir |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159243A (en) * | 2019-05-27 | 2019-08-23 | 中国石油天然气股份有限公司 | Acid fracturing method for seam network of carbonate rock reservoir |
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