CN104632173B - Fracture-network fracturing layer selection method for non-natural fracture tight reservoir - Google Patents
Fracture-network fracturing layer selection method for non-natural fracture tight reservoir Download PDFInfo
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- CN104632173B CN104632173B CN201410834278.9A CN201410834278A CN104632173B CN 104632173 B CN104632173 B CN 104632173B CN 201410834278 A CN201410834278 A CN 201410834278A CN 104632173 B CN104632173 B CN 104632173B
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- 238000010187 selection method Methods 0.000 title abstract description 5
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 125000000058 cyclopentadienyl group Chemical group C1(=CC=CC1)* 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- ZSWFCLXCOIISFI-UHFFFAOYSA-N endo-cyclopentadiene Natural products C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035515 penetration Effects 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
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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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a fracture-network fracturing layer selection method for a non-natural fracture tight reservoir. The problem that no corresponding layer selection methods are provided for fracture-network fracturing of a non-fracture tight sand shale reservoir is solved. The fracture-network fracturing layer selection method concretely includes the steps that when the brittleness index is larger than 40%, the difference of two horizontal stresses is analyzed, and when the difference of the two horizontal stresses is larger than 5 MPa, a common fracturing technology is selected for development; when the difference of the two horizontal stresses is smaller than 5 MPa, the difference of the stresses is compared with the net pressure of a crack, and when the net pressure inside the crack is larger than the difference of the two horizontal stresses, a vertical shaft fracture-network fracturing technology is selected for development. The fracture-network fracturing technology is effectively guided to perform well layer preference selection.
Description
Technical field
The present invention relates to fine and close sand mud reservoir storey increase design technical field, particularly stitch net pressure break and select layer method.
Background technology
What abroad intrinsic fracture compact reservoir was had built up with volume fracturing at present selects layer method, but to domestic non-Fractured
Fine and close sand mud reservoir seam net pressure break selects layer inapplicable, and domestic does not have related content research.
Content of the invention
In order to solve the problems, such as in background technology, carry out and layer method has been selected to non-natural crack compact reservoir seam net pressure break
Research, to meet the demand that oil field densification sand mud reservoir stitches the transformation of net fracturing technology.
For achieving the above object, the technical solution used in the present invention is：A kind of non-natural crack compact reservoir seam net
Pressure break selects layer method, particularly in the normal direction leak-off considering porous media Coupling effect of seepage rock deformation and fracturing fluid and tangential flowing
On the basis of, set up non-natural crack compact reservoir, form the mechanical model of Stress Release seam, by theoretical and indoor test research
Determine that rock brittleness, net pressure, level two are the Dominated Factors forming Stress Release seam to stress difference, above-mentioned each Dominated Factors
Obtaining value method is：
（1）Rock brittleness：The fragility size of rock itself is weighed at scene using brittleness index as index, and brittleness index calculates
Formula is：
In formula：B- rock brittleness index, dimensionless；
- rock failure mechanism of rock intensity, and compressive strength of rock, MPa；
Residual strength after the-rock failure mechanism of rock, MPa；
Data above can be obtained by rock full curve test analysis；
（2）Net pressure：Refer to the net pressure in crack in pressing crack construction process, can be drawn by below equation：
P
net
=P
f
- P
cl
In formula：
P net Crack net pressure, MPa；
P f Pressure in crack during pressure break, MPa；
P cl Fracture closure pressure, MPa；
Above each item data can be obtained by mini-frac analysis；
（3）Level two is to stress difference：Refer to the difference of the minimum and maximum principal stress of rock horizontal direction, rock three axle can be passed through
Stress test draws；
Determine brittleness index first according to above-mentioned Dominated Factors obtaining value method, when brittleness index is more than 40%, carry out level
Two stress difference analyses, when two stress differences of level are more than 5MPa, from the exploitation of conventional fracturing technology, when two stress of level
When difference is less than 5MPa, this stress difference is compared with crack net pressure, when in crack, net pressure is more than two stress differences of level
When, select using straight well seam net fracturing technique exploitation.
Beneficial effect：This well and stratum selection method is applied to carry out the field test of 50 mouthfuls of wells, after Crack Monitoring and pressure
Production development confirms, the reservoir of application the method transformation can form seam net system, compared with conventional fracturing technology, applies identical
Under the conditions of work scale, the controlled volume in crack increased 60-82 times, and after pressure, the accumulative oil that increases improves 7-12.5 times, effectively refers to
Having led seam net fracturing technology, to carry out well layer preferred.
Specific embodiment
With reference to specific embodiment, the present invention is described further：
Oblique 74 wells of luxuriant 39- are in a bite exploitation straight well of Daqing Yushulin Oilfield cyclopentadienyl 503 blocks, reservoir air penetration
Rate 1.2mD, porosity 12%.It is 46.34% by rock full curve test analysis brittleness index, the test of rock triaxial stress draws
Level two calculates net pressure 3.8MPa in seam to stress difference 3.7MPa, mini-frac.It is seen from the above data that this well is permissible
Selection carries out straight well seam net fracturing technique and develops.
Complete preferably 5 intervals of well are transformed using seam net fracturing technology, measure sandstone thickness 26.7m, effective thickness
21.2m, injects composite fracturing fluid 8820m altogether3, operational discharge capacity 7.5-8.2m3/ min, adds proppant 141m3.Daily output liquid before pressure
2.3t/d, day oil-producing 1.5t/d；Day at initial stage oil-producing 37.2t after pressure, is 13.3 times of same block straight well, and 5 month to dates increase oil
1250t.
Claims (1)
1. a kind of non-natural crack compact reservoir seam net pressure break selects layer method, is particularly considering porous media fluid structurecoupling effect
Should and fracturing fluid normal direction leak-off and tangential flow on the basis of, set up non-natural crack compact reservoir, form Stress Release seam
Mechanical model, determining rock brittleness, net pressure, level two by theoretical and indoor test is to form stress to stress difference
Discharge the Dominated Factors of seam, the obtaining value method of above-mentioned each Dominated Factors is：
（1）Rock brittleness：The fragility size of rock itself, brittleness index computing formula are weighed in scene using brittleness index as index
For：
In formula：B- rock brittleness index, dimensionless；
- rock failure mechanism of rock intensity, i.e. compressive strength of rock, MPa；
Residual strength after the-rock failure mechanism of rock, MPa；
Data above can be obtained by rock full curve test analysis；
（2）Net pressure：Refer to the net pressure in crack in pressing crack construction process, can be drawn by below equation：
P
net
=P
f
- P
cl
In formula：
P net Crack net pressure, MPa；
P f Pressure in crack during pressure break, MPa；
P cl Fracture closure pressure, MPa；
Above each item data can be obtained by mini-frac analysis；
（3）Level two is to stress difference：Refer to the difference of the minimum and maximum principal stress of rock horizontal direction, rock triaxial stress can be passed through
Test draws；
It is characterized in that：According to above-mentioned each Dominated Factors obtaining value method, it is first determined brittleness index, when brittleness index is more than 40%
When, carry out level two and analyze to stress difference, when level two is more than 5MPa to stress difference, developed from conventional fracturing technology, when
Level two to stress difference be less than 5MPa when, this stress difference is compared with crack net pressure, when in crack net pressure more than water
Flat two to stress difference when, select using straight well seam net fracturing technique exploitation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834278.9A CN104632173B (en) | 2014-12-30 | 2014-12-30 | Fracture-network fracturing layer selection method for non-natural fracture tight reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834278.9A CN104632173B (en) | 2014-12-30 | 2014-12-30 | Fracture-network fracturing layer selection method for non-natural fracture tight reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104632173A CN104632173A (en) | 2015-05-20 |
| CN104632173B true CN104632173B (en) | 2017-02-22 |
Family
ID=53211352
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410834278.9A Active CN104632173B (en) | 2014-12-30 | 2014-12-30 | Fracture-network fracturing layer selection method for non-natural fracture tight reservoir |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989357B (en) * | 2015-06-12 | 2017-09-15 | 中国石油天然气股份有限公司 | A kind of method for selecting fine and close oil-gas reservoir refracturing target well |
| CN105156086B (en) * | 2015-09-25 | 2018-02-02 | 中国石油天然气股份有限公司 | A kind of forming method of volume fracturing seam net |
| CN106703778B (en) * | 2015-11-18 | 2021-03-26 | 中国石油化工股份有限公司 | Method for increasing fracture reconstruction volume by shale gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046916A (en) * | 2011-10-13 | 2013-04-17 | 陈兴佳 | Selective injection method of refracturing plugging agent for double parallel connection rock core |
| CN103256046A (en) * | 2013-04-28 | 2013-08-21 | 北京大学 | Unconventional oil and gas reservoir horizontal well section full-fracture-length fracturing parameter analog method and device |
| CN103437746A (en) * | 2013-06-28 | 2013-12-11 | 东方宝麟科技发展(北京)有限公司 | Volume fracturing method for multiple cracks in multiple sections of horizontal well |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7644761B1 (en) * | 2008-07-14 | 2010-01-12 | Schlumberger Technology Corporation | Fracturing method for subterranean reservoirs |
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2014
- 2014-12-30 CN CN201410834278.9A patent/CN104632173B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046916A (en) * | 2011-10-13 | 2013-04-17 | 陈兴佳 | Selective injection method of refracturing plugging agent for double parallel connection rock core |
| CN103256046A (en) * | 2013-04-28 | 2013-08-21 | 北京大学 | Unconventional oil and gas reservoir horizontal well section full-fracture-length fracturing parameter analog method and device |
| CN103437746A (en) * | 2013-06-28 | 2013-12-11 | 东方宝麟科技发展(北京)有限公司 | Volume fracturing method for multiple cracks in multiple sections of horizontal well |
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| CN104632173A (en) | 2015-05-20 |
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