CN109505578A - Repeated fracturing method for realizing lateral residual oil potential excavation of crack of ultra-low permeability oil reservoir old well - Google Patents
Repeated fracturing method for realizing lateral residual oil potential excavation of crack of ultra-low permeability oil reservoir old well Download PDFInfo
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- CN109505578A CN109505578A CN201910020376.1A CN201910020376A CN109505578A CN 109505578 A CN109505578 A CN 109505578A CN 201910020376 A CN201910020376 A CN 201910020376A CN 109505578 A CN109505578 A CN 109505578A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000035699 permeability Effects 0.000 title claims abstract description 18
- 238000009412 basement excavation Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002253 acid Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 15
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 7
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 6
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 4
- 210000002445 nipple Anatomy 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims 25
- 235000019198 oils Nutrition 0.000 claims 25
- 235000019774 Rice Bran oil Nutrition 0.000 claims 1
- 239000008165 rice bran oil Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 239000003129 oil well Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
-
- 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)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a repeated fracturing method for realizing lateral residual oil potential excavation of an ultra-low permeability oil reservoir old well, which comprises the following steps: 1) selecting a production well which is positioned on the lateral direction of the water flooding dominant direction, and preferably selecting a potential interval; 2) performing directional perforation on the potential interval and the distribution direction of the residual oil; 3) setting a double-seal fracturing string in the new perforation layer section; 4) performing acid fracturing and repeated fracturing continuous construction on the directional perforation layer section; 5) and closing the well, open-blowing and taking out the fracturing string for re-production. The method provided by the invention can form a new steering crack in the repeated fracturing process of the old oil field of the ultra-low permeability oil reservoir, and dig the residual oil on the lateral side of the hidden crack to achieve the purposes of controlling water and increasing oil.
Description
Technical field
The present invention relates to petroleum production engineering field, in particular to a kind of old well of extra-low permeability oil reservoirs realizes the lateral remaining oil in crack
The refracturing method for increasing taped the latent power.
Background technique
Using Ansai C 6 Layer as the sandstone reservoir of representative, oil reservoir development thickness is big (15-20m) on longitudinal direction,
The multiple substratums of development in layer mainly use the development scheme based on " water filling+pressure break " to be developed, and initial stage perforating degree is low
(30%-40%).Fracture extension is influenced after by reservoir heterogeneity and more round measures, with the extension of production time, crack
There are water drive predominant directions for main upward oil well, cause main to oil well premature water breakthrough.Meanwhile encryption check well coring result table
Bright, water drive is affected by reservoir properties and man-made fracture, and water drive is uneven.In irregular ellipticity or ribbon point in plane
Cloth, it is lateral that remaining oil is mainly distributed on crack.In order to sufficiently employ the lateral remaining oil in old crack, the main method of early period has old well
It temporarily blocks up turnaround fracture and waterline laterally encrypts or sidetracking two ways.
Above-mentioned existing lateral Tapping Residual Oil method is primarily present following problems: first is that diverting agent is constructed in single seam
Poor controllability, temporarily stifled boost effect and construction continuity are undesirable, and success rate is low, and lateral seam is difficult；Second is that using encryption cloth
Well, successively decrease to old well production and be affected (increase since second year successively decrease 8% or more), and new well single well productivity is low；Third is that side
Brill is similar with Encryption Well, beats new well complex procedures, at high cost, slim-hole production maintenance difficulty is big.
Summary of the invention
To solve drawbacks described above existing in the prior art, the purpose of the present invention is to provide a kind of extra-low permeability oil reservoirs are old
Well realizes the refracturing method for increasing of the lateral Tapping Residual Oil in crack, and this method success rate is high, new well single well productivity is high, cost
It is low.
The present invention is mainly that development is every the sandstone heat-bodied oil hiding of interlayer in special hypotonic and layer, in the repetition of high water cut rate oil well
In pressure break realize control critical eigenvalue crack initiation direction, force crack turn to, avoid refracturing crack carried out in old crack extend and
Extension links up the lateral remaining oil region of waterline to realize and turn to crack, oil well is made to form many cracks, promote laterally by
Effect.
The present invention is realized by following technical proposals.
A kind of old well of extra-low permeability oil reservoirs realizes the refracturing method of the lateral Tapping Residual Oil in crack, including following step
It is rapid:
S1, selection be located at water drive predominant direction it is lateral on producing well potentiality interval；
S2 is oriented perforation to potentiality interval and remaining oil distribution direction；
S3 sets the double envelope fracturing strings of new perforated zone tripping in by hydraulic booster in oil pipe in fracturing process；
S4 carries out acid fracturing to oriented perforating interval and refracturing is continuously constructed；
S5, closing well open flow act fracturing string and reproduce.
Preferably, in step S1, the well of the water drive predominant direction and well pattern arrangement arranges direction, i.e. reservoir maximum horizontal master
Stress direction is consistent.
Preferably, the water drive predominant direction is that corner well well arranges direction, direction producing well later period and one corrugate of water injection well
It is logical, waterline is formed, potentiality well should be the lateral end hole of waterline；
The potentiality interval selects the low-permeability layer non-perforated interval developed every interlayer, and the thickness of interlayer > with former perforated interval
2-3m。
Preferably, in step S2, the oriented perforating method carries out perforation using cable transmission oriented perforating method, penetrates
Hole orientation is vertical with well row direction；Perforating gun phase uses 180 °.
Preferably, it if making double-vane symmetric fracture in waterline two sides, is shot in two side directions while perforation；If only in waterline one
Make single-blade crack in side, it is only necessary to shoot perforation in same side direction.
Preferably, in step S3, double envelope fracturing strings include by pressure break oil pipe be connected to tripping in into production string under
Supreme sequentially connected ball seat, K344 packer, pressure-guiding sand blower, oil pipe adjustment pipe nipple, K344 packer and hydraulic anchor；Its
In, hydraulic anchor and ball seat are respectively at the hypertonic water logging section in underground, and two K344 packers are in hypotonic between hypertonic water logging section
Remaining oil enrichment section.
Preferably, in step S4, the acid fracturing and refracturing are continuously constructed, and are specially handed in the small displacement condition next stage
It for injection mud acid, reduces fracture pressure and stitches interior net pressure, control critical eigenvalue height realizes that turning to fracture initiation extends；Then in
Etc. discharge capacities inject linear glue carry out turn to crack seam extend；Last huge discharge injection frozen glue carries proppant to steering crack
It is filled, major fracture is supported.
Preferably, the small displacement is 0.8~1.0m3/min；The stage is alternately injected to according to 5~10m3Or every meter
Core intersection 1m3Mud acid and 10m3The sequence alternate acid filling of insulating liquid, adding up injection mud acid amount is 20-30m3。
Preferably, the medium discharge capacity is 1.0~1.5m3/ min injects guanidine matrix liquid.
Preferably, the huge discharge is > 2.0m3/ min, injection crosslinking guanidine glue.
The present invention has the advantages that due to taking above technical scheme
1. preferred hypotonic interval is transformed, remaining oil enrichment, material base is laid to improve single well productivity.
2. a pair old crack is not processed, secondary extension will not be carried out to old crack, can achieve the purpose of control water.
New seam is laterally made 3. realizing under simple process conditions, according to remaining oil distribution position, utilizes directional perforating gun
Double-vane or single-blade perforation are carried out, crack initiation is forced and realizes that crack turns to, so that fractuer direction is linked up remaining oil, reaches Remaining Oil
Purpose.
4. combining using different liquids combination and different operational discharge capacities, crack turning radius is improved, reduces crack net pressure,
It prevents steering crack from extending in old crack, realizes the effective remaining oil of the extension in crack；Water-control oil-increasing is obvious, remarkable benefit.
5. it is at low cost, do not generate drilling well, well cementation or the land expropriation cost for beating new well, Encryption Well etc..
This method improves oil well productivity, employs remaining oil and improves recovery ratio and provides for high water cut rate oil reservoir same type well
Technological borrowing.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Inappropriate limitation of the present invention is constituted, in the accompanying drawings:
Fig. 1 is the double envelope fracturing string structural schematic diagrams of the present invention.
In figure: 1-ball seat (dribbling), 2-K344 packers, 3-pressure-guiding sand blowers, 4-oil pipes adjustment pipe nipple, 5-
K344 packer, 6-hydraulic anchors, 7-pressure break oil pipes, 8-production strings.
Specific embodiment
Below in conjunction with specific embodiment, the present invention will be described in detail, herein illustrative examples and explanation of the invention
For explaining the present invention, but it is not as a limitation of the invention.
The embodiment of the present invention provides a kind of refracturing of old well realization lateral Tapping Residual Oil in crack of extra-low permeability oil reservoirs
Method, comprising the following steps:
S1, selection be located at water drive predominant direction it is lateral on producing well potentiality interval.
Water drive predominant direction and the well of well pattern arrangement arrange direction, i.e. reservoir orientation of principal stress is consistent.With diamond shape
For inverted nine-spot pattern, water drive predominant direction be generally corner well well row direction, the direction producing well later period substantially with water injection well one
It rises and links up, waterline has been formed, it is therefore preferable that potentiality well should be the lateral end hole of waterline.Likewise it is preferred that potentiality interval is mainly
According to the physical property condition of oil layer section, the low-permeability layer non-perforated interval developed every interlayer, and the thickness of interlayer with former perforated interval are selected
Usual > 2-3m.
S2 is oriented perforation to potentiality interval and remaining oil distribution direction.
Oriented perforating method usually carries out perforation with the preferable cable transmission oriented perforating method of oil field applicability, penetrates
Hole orientation is determined according to remaining oil distribution (usually vertical with well row direction)；Perforating gun phase uses 180 °, if in waterline
Double-vane symmetric fracture is made in two sides, shoots in two side directions while perforation；If only making single-blade crack in waterline side, it is only necessary to same
Perforation is shot in one side direction.
S3, to the double envelope fracturing strings of new perforated zone tripping in.
As shown in Figure 1, double envelope fracturing strings, including tripping in is connected into production string 8 from bottom to up by pressure break oil pipe 7
Sequentially connected ball seat (dribbling) 1, K344 packer 2, pressure-guiding sand blower 3, oil pipe adjustment pipe nipple 4, K344 packer 5 and waterpower
Anchor 6.This pair envelope fracturing string is set by hydraulic booster in oil pipe in fracturing process.Wherein, hydraulic anchor 6 and ball seat 1 are located respectively
In the hypertonic water logging section in underground, two K344 packers 2,5 are in the hypotonic remaining oil enrichment section between hypertonic water logging section.2
K344 packer effectively insulates new perforated interval described in S2 step, realizes and the independence of the perforated interval is transformed.
S4 carries out acid fracturing to oriented perforating interval and refracturing is continuously constructed.
Acid fracturing and refracturing are continuously constructed, mainly (the discharge capacity: 0.8~1.0m under the conditions of small displacement first3/min)
Stage alternately injects mud acid 20-30m3, reduce fracture pressure and stitch interior net pressure, control critical eigenvalue height realizes that turning to crack rises
Split extension.Then medium discharge capacity (discharge capacity: 1.0~1.5m3/ min) the linear glue (guanidine matrix liquid) of injection carry out turning to making for crack
Seam extends.Last huge discharge (discharge capacity: > 2.0m3/ min) frozen glue (crosslinking guanidine glue) carrying proppant is injected to the progress of steering crack
Filling, effectively supports major fracture.Stage is alternately injected to according to 5~10m3(or every meter of core intersection 1m3Mud acid) with
10m3The sequence alternate acid filling of insulating liquid increases acid solution operating distance, and adding up injection mud acid amount is 20-30m3。
The step mainly has 3 purposes: first is that the fracture pressure in new crack can be effectively reduced in the injection of acid solution small displacement, together
When by acid solution to the corrosion of reservoir rock, improve the turning radius for turning to crack and turn to distance；Second is that medium discharge capacity
Inject linear glue, discharge capacity is small, and liquid viscosity is low (viscosity 10mpas~20mpas), can reduce crack turn to extend during
Net pressure in stitching, effective control critical eigenvalue height avoid turning to crack and the communication of old crack；Third is that huge discharge injection frozen glue can be right
The crack of formation is effectively supported, and certain slit width is reached, and realizes effective laying of proppant.
S5, closing well open flow act fracturing string and reproduce.
Carry out 6 mouthfuls of well field tests in old filed using the above method of the present invention, individual well increases day by day oily 1.5t or more after measure,
Current year individual well is accumulative to increase oil 406t, is accumulative 2.3 times for increasing oil of conventional refractured well individual well, producing well comprehensive water cut after measure
4% is averagely had dropped, illustrates that remaining oil producing is obvious.
The present invention is not limited to the above embodiments, on the basis of technical solution disclosed by the invention, the skill of this field
For art personnel according to disclosed technology contents, one can be made to some of which technical characteristic by not needing creative labor
A little replacements and deformation, these replacements and deformation are within the scope of the invention.
Claims (10)
1. a kind of refracturing method that old well of extra-low permeability oil reservoirs realizes the lateral Tapping Residual Oil in crack, which is characterized in that packet
Include following steps:
S1, selection be located at water drive predominant direction it is lateral on producing well potentiality interval；
S2 is oriented perforation to potentiality interval and remaining oil distribution direction；
S3 sets the double envelope fracturing strings of new perforated zone tripping in by hydraulic booster in oil pipe in fracturing process；
S4 carries out acid fracturing to oriented perforating interval and refracturing is continuously constructed；
S5, closing well open flow act fracturing string and reproduce.
2. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 1 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that in step S1, the well of the water drive predominant direction and well pattern arrangement arranges direction, i.e. reservoir maximum horizontal master
Stress direction is consistent.
3. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 2 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that the water drive predominant direction is that corner well well arranges direction, direction producing well later period and one corrugate of water injection well
It is logical, waterline is formed, potentiality well should be the lateral end hole of waterline；
The potentiality interval selects the low-permeability layer non-perforated interval developed every interlayer, and the thickness of interlayer > 2- with former perforated interval
3m。
4. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 1 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that in step S2, the oriented perforating method carries out perforation, perforation using cable transmission oriented perforating method
Orientation is vertical with well row direction；Perforating gun phase uses 180 °.
5. the refracturing that the old well of extra-low permeability oil reservoirs according to claim 1 or 3 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that if making double-vane symmetric fracture in waterline two sides, shot in two side directions while perforation；If only in waterline
Make single-blade crack in side, it is only necessary to shoot perforation in same side direction.
6. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 1 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that in step S3, double envelope fracturing strings include by pressure break oil pipe be connected to tripping in into production string from down toward
Upper sequentially connected ball seat, K344 packer, pressure-guiding sand blower, oil pipe adjustment pipe nipple, K344 packer and hydraulic anchor；Wherein,
Hydraulic anchor and ball seat are respectively at the hypertonic water logging section in underground, and two K344 packers are in the hypotonic residue between hypertonic water logging section
Oil enrichment section.
7. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 1 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that in step S4, the acid fracturing and refracturing are continuously constructed, and are specially handed in the small displacement condition next stage
It for injection mud acid, reduces fracture pressure and stitches interior net pressure, control critical eigenvalue height realizes that turning to fracture initiation extends；Then in
Etc. discharge capacities inject linear glue carry out turn to crack seam extend；Last huge discharge injection frozen glue carries proppant to steering crack
It is filled, major fracture is supported.
8. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 7 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that the small displacement is 0.8~1.0m3/min；The stage is alternately injected to according to 5~10m3Or every rice bran oil
Thickness degree 1m3Mud acid and 10m3The sequence alternate acid filling of insulating liquid, adding up injection mud acid amount is 20-30m3。
9. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 7 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that the medium discharge capacity is 1.0~1.5m3/ min injects guanidine matrix liquid.
10. the refracturing side that the old well of extra-low permeability oil reservoirs according to claim 7 realizes the lateral Tapping Residual Oil in crack
Method, which is characterized in that the huge discharge is > 2.0m3/ min, injection crosslinking guanidine glue.
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| CN111219177A (en) * | 2020-03-03 | 2020-06-02 | 中国石油天然气股份有限公司 | Fracturing method for 3-inch half-slim well of ultra-low permeability sandstone reservoir sidetracking horizontal well |
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| CN114837605A (en) * | 2022-05-31 | 2022-08-02 | 中国石油化工股份有限公司 | Oil increasing method for casing damage well free of hole repairing suspension |
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| CN110552656A (en) * | 2019-08-19 | 2019-12-10 | 中国石油天然气股份有限公司 | Method for fixed-point crack initiation of low-permeability layer of water flooded well |
| CN111219177A (en) * | 2020-03-03 | 2020-06-02 | 中国石油天然气股份有限公司 | Fracturing method for 3-inch half-slim well of ultra-low permeability sandstone reservoir sidetracking horizontal well |
| CN111219177B (en) * | 2020-03-03 | 2022-05-10 | 中国石油天然气股份有限公司 | 3-inch and half-small-borehole fracturing method for sidetracking horizontal well of ultra-low permeability sandstone reservoir |
| CN111472746A (en) * | 2020-04-17 | 2020-07-31 | 北京捷贝通石油技术股份有限公司 | Technological method for isolated dessert communication among carbonate fracture-cavity oil reservoir wells |
| CN111472746B (en) * | 2020-04-17 | 2022-01-07 | 捷贝通石油技术集团股份有限公司 | Technological method for isolated dessert communication among carbonate fracture-cavity oil reservoir wells |
| CN114837605A (en) * | 2022-05-31 | 2022-08-02 | 中国石油化工股份有限公司 | Oil increasing method for casing damage well free of hole repairing suspension |
| CN114837605B (en) * | 2022-05-31 | 2024-05-03 | 中国石油化工股份有限公司 | Oil increasing method for casing damage well hole-repairing-free suspension |
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