CN104632173A - 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 PDFInfo
- Publication number
- CN104632173A CN104632173A CN201410834278.9A CN201410834278A CN104632173A CN 104632173 A CN104632173 A CN 104632173A CN 201410834278 A CN201410834278 A CN 201410834278A CN 104632173 A CN104632173 A CN 104632173A
- Authority
- CN
- China
- Prior art keywords
- rock
- crack
- stress
- net
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010187 selection method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 4
- 239000011435 rock Substances 0.000 claims description 28
- 238000012360 testing method Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000001808 coupling effect Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability 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
Landscapes
- 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
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
At present external volume fracturing set up to intrinsic fracture compact reservoir select layer method, but layer is selected to domestic non-Fractured fine and close sand mud reservoir seam net pressure break and inapplicable, and domesticly there is no related content research.
Summary of the invention
In order to solve the problem in background technology, carry out research non-natural crack compact reservoir seam net pressure break being selected to layer method, to meet the demand of oil field fine and close sand mud reservoir seam net fracturing technology transformation.
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 on the basis considering porous media Coupling effect of seepage rock deformation and of the fracturing fluid normal direction leak-off and tangential flowing, set up non-natural crack compact reservoir, form the mechanical model of stress release seam, determining rock brittleness, net pressure, level two to stress difference by theoretical and indoor test is the Dominated Factors forming stress release seam, and the obtaining value method of above-mentioned each Dominated Factors is:
(1) rock brittleness: the on-the-spot fragility size weighing rock itself using brittleness index as index, brittleness index design formulas 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;
Above data can be obtained by rock full curve test analysis;
(2) net pressure: refer to the net pressure in pressing crack construction process in crack, can be drawn by following formula:
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 every data can be obtained by mini-frac analysis;
(3) level two is to stress difference: the difference referring to the minimum and maximum main stress bar of rock horizontal direction, draws by the test of rock triaxial stress;
First brittleness index is determined according to above-mentioned Dominated Factors obtaining value method, when brittleness index is greater than 40%, carry out level two stress difference analyses, when level two stress differences are greater than 5MPa, select conventional fracturing technology to develop, when level two stress differences are less than 5MPa, this stress difference and crack net pressure are compared, when net pressure in crack is greater than level two stress differences, select to adopt the exploitation of straight well seam net fracturing technique.
beneficial effect: apply the field trial that this well and stratum selection method has carried out 50 mouthfuls of wells, confirmed by Production development after Crack Monitoring and pressure, the reservoir of application the method transformation can form seam net system, compared with conventional fracturing technology, under identical scope of construction item condition, volume that crack controls adds 60-82 doubly, and after pressure, the accumulative oil that increases improves 7-12.5 doubly, and effectively directing seam net fracturing technology, to carry out well layer preferred.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further:
Oblique 74 wells of luxuriant 39-are a bite exploitation straight wells being positioned at luxuriant 503 blocks of Daqing Yushulin Oilfield, reservoir air permeability 1.2mD, degree of porosity 12%.Be 46.34% by rock full curve test analysis brittleness index, the test of rock triaxial stress show that level two is to stress difference 3.7MPa, and mini-frac calculates net pressure 3.8MPa in seam.As can be seen from above-mentioned data, this well can be selected to carry out straight well seam net fracturing technique and develop.
Full well preferably 5 intervals adopts seam net fracturing technology to transform, and measure sandstone thickness 26.7m, effective thickness 21.2m, inject composite fracturing fluid 8820m altogether
3, operational discharge capacity 7.5-8.2m
3/ min, adds proppant 141m
3.The pressure production fluid 2.3t/d day before yesterday, day produce oil 1.5t/d; Day at initial stage produce oil 37.2t after pressure, be 13.3 times of same block straight well, 5 month to dates increase oily 1250t.
Claims (1)
1. a non-natural crack compact reservoir seam net pressure break selects layer method, particularly on the basis considering porous media Coupling effect of seepage rock deformation and of the fracturing fluid normal direction leak-off and tangential flowing, set up non-natural crack compact reservoir, form the mechanical model of stress release seam, determining rock brittleness, net pressure, level two to stress difference by theoretical and indoor test is the Dominated Factors forming stress release seam, and the obtaining value method of above-mentioned each Dominated Factors is:
(1) rock brittleness: the on-the-spot fragility size weighing rock itself using brittleness index as index, brittleness index design formulas 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;
Above data can be obtained by rock full curve test analysis;
(2) net pressure: refer to the net pressure in pressing crack construction process in crack, can be drawn by following formula:
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 every data can be obtained by mini-frac analysis;
(3) level two is to stress difference: the difference referring to the minimum and maximum main stress bar of rock horizontal direction, draws by the test of rock triaxial stress;
It is characterized in that: according to above-mentioned each Dominated Factors obtaining value method, first brittleness index is determined, when brittleness index is greater than 40%, carry out level two stress difference analyses, when level two stress differences are greater than 5MPa, select conventional fracturing technology to develop, when level two stress differences are less than 5MPa, this stress difference and crack net pressure are compared, when net pressure in crack is greater than level two stress differences, selects to adopt the exploitation of straight well seam net fracturing technique.
Priority Applications (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 compact 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 compact reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104632173A true CN104632173A (en) | 2015-05-20 |
| CN104632173B CN104632173B (en) | 2017-02-22 |
Family
ID=53211352
Family Applications (1)
| 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 compact reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104632173B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989357A (en) * | 2015-06-12 | 2015-10-21 | 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 |
| CN105156086A (en) * | 2015-09-25 | 2015-12-16 | 中国石油天然气股份有限公司 | Method for forming volume fracturing network |
| CN106703778A (en) * | 2015-11-18 | 2017-05-24 | 中国石油化工股份有限公司 | Method for increasing fracture stimulated reservoir volume of shale gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100006293A1 (en) * | 2008-07-14 | 2010-01-14 | Schlumberger Technology Corporation | Fracturing method for subterranean reservoirs |
| 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 |
-
2014
- 2014-12-30 CN CN201410834278.9A patent/CN104632173B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100006293A1 (en) * | 2008-07-14 | 2010-01-14 | Schlumberger Technology Corporation | Fracturing method for subterranean reservoirs |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989357A (en) * | 2015-06-12 | 2015-10-21 | 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 |
| 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 |
| CN105156086A (en) * | 2015-09-25 | 2015-12-16 | 中国石油天然气股份有限公司 | Method for forming volume fracturing network |
| CN106703778A (en) * | 2015-11-18 | 2017-05-24 | 中国石油化工股份有限公司 | Method for increasing fracture stimulated reservoir volume of shale gas |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104632173B (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103953323B (en) | A kind of horizontal well produces the hydraulic fracturing process of seam net | |
| CN103089228B (en) | Sand acid fracturing method is taken in the acid of a kind of argillaceous dolomite ground surface crosslinking | |
| CN104963671B (en) | A kind of fracturing reform method of High angle from formula well reservoir | |
| CN107989592B (en) | Staged fracturing method for horizontal well | |
| CN103089224A (en) | Fracturing method for comprehensively controlling fracture height | |
| WO2017121112A1 (en) | Method for evaluating performance of multistage hydraulic jet fracturing string | |
| CN103527163A (en) | Tight reservoir horizontal well volume fracturing process | |
| CN107630686B (en) | compact oil energy supplementing method for staggered displacement and imbibition displacement between horizontal well sections | |
| CN108119120B (en) | Gas well repeated fracturing well selection layer selection method | |
| CN206860155U (en) | Coal-series gas U-shaped well drilling and fracturing structure | |
| CN101737029A (en) | Crude oil extraction method capable of effectively utilizing ultra-low permeability reservoir bed | |
| CN103244094A (en) | Carbonate rock multi-slug injection type fracturing method | |
| CN108661616B (en) | Layered fracturing method suitable for sandstone oil and gas reservoir | |
| Xu et al. | Field test of volume fracturing for horizontal wells in Sulige tight sandstone gas reservoirs, NW China | |
| CN104632173B (en) | Fracture network fracturing layer selection method for non-natural fracture compact reservoir | |
| CN108661613B (en) | Method for increasing injection of water injection development oil reservoir | |
| CA2863764A1 (en) | Phased stimulation methods | |
| CN110259421A (en) | Fractured compact oil reservoir water injection energy supplementing method | |
| CN104564007A (en) | Vertical well fracture network fracturing process for non-fractured compact sand-shale reservoir | |
| CN110529089B (en) | Repeated fracturing method for open hole horizontal well | |
| CN103048184A (en) | Testing method of breakthrough pressure of repeated fracturing plugging agent | |
| CN104234682B (en) | A kind ofly be applicable to separate stratum fracturing of continuous oil pipe method that is many, girdle | |
| Wu et al. | Resources | |
| CN110374574A (en) | The method of straight well directional well massive hydraulic fracture control critical eigenvalue complexity | |
| CN105332685B (en) | A kind of proppant multistage spread method for improving coal seam complex fracture support effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |