CN104632173B - Fracture network fracturing layer selection method for non-natural fracture compact reservoir - Google Patents

Fracture network fracturing layer selection method for non-natural fracture compact reservoir Download PDF

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Publication number
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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rock
crack
stress difference
net
stress
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CN104632173A (en
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兰中孝
张有才
金岩松
兰乘宇
汪玉梅
张海龙
杨光
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/267Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing 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
    • GPHYSICS
    • G16INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16ZINFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
    • G16Z99/00Subject 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 fracturing and layer selecting method for a non-natural fractured compact reservoir fracture network, which solves the problem that no corresponding layer selecting method exists in fracturing of the non-fractured compact sand shale reservoir fracture network. Specifically, when the brittleness index is larger than 40%, performing horizontal two-item stress difference analysis, when the horizontal two-item stress difference is larger than 5MPa, selecting a conventional fracturing process for development, when the horizontal two-item stress difference is smaller than 5MPa, comparing the stress difference with the net pressure of the crack, and when the net pressure in the crack is larger than the horizontal two-item stress difference, selecting a vertical well fracture network fracturing technology for development. The method effectively guides the fracture network fracturing process to carry out well layer optimization.

Description

Non-natural crack compact reservoir seam net pressure break selects layer method
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.
CN201410834278.9A 2014-12-30 2014-12-30 Fracture network fracturing layer selection method for non-natural fracture compact reservoir Active CN104632173B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
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 Method for selecting tight oil and gas reservoir repeated fracturing target well
CN105156086B (en) * 2015-09-25 2018-02-02 中国石油天然气股份有限公司 Method for forming volume fracturing network
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7644761B1 (en) * 2008-07-14 2010-01-12 Schlumberger Technology Corporation Fracturing method for subterranean reservoirs

Patent Citations (3)

* Cited by examiner, † Cited by third party
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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