CN107989585A - The method for calculating volume fracturing transformation volume - Google Patents
The method for calculating volume fracturing transformation volume Download PDFInfo
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- CN107989585A CN107989585A CN201610973236.2A CN201610973236A CN107989585A CN 107989585 A CN107989585 A CN 107989585A CN 201610973236 A CN201610973236 A CN 201610973236A CN 107989585 A CN107989585 A CN 107989585A
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- 230000009466 transformation Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 10
- 230000001186 cumulative effect Effects 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 230000035699 permeability Effects 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 3
- 208000010392 Bone Fractures Diseases 0.000 description 7
- 206010017076 Fracture Diseases 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000001131 transforming effect 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
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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 present invention provides a kind of method for calculating volume fracturing transformation volume, and the method for calculating volume fracturing transformation volume includes：Step 1, the pressure drop data of pressure break is enrolled；Step 2, well testing processing is carried out to pressure drop data, draws in-place permeability, skin factor, calculate well storage coefficient；Step 3, coefficient is stored up according to well, it is anti-to release fluid communication cumulative volume；Step 4, according to fluid communication cumulative volume, petrographic province transformation volume is calculated.The method of calculating volume fracturing transformation volume realizes the rocky areas volume that quantitative calculating volume fracturing is transformed.
Description
Technical field
The present invention relates to oil field development technical field, especially relates to a kind of side for calculating volume fracturing transformation volume
Method.
Background technology
Volume fracturing technology thinks that the crack initiation in crack and extension are not merely the extensional crackings in crack, also exists and shears, is sliding
The mechanical behavior of the complexity such as shifting, bad break.Its mechanism of action is while forming one or more major fracture by pressure break, is made natural
Crack constantly expansion and brittle rock produces shearing slip, realizes the communication to intrinsic fracture, rock bedding, and in major fracture
It is lateral force to form secondary fracture, and continue branch on secondary fracture and form secondary crack, and so on, form day
Right crack and the interlaced fracture network of man-made fracture.So as to which effective reservoir be smashed, the modernization overlay of three-dimensional, increase are realized
Seepage area and flow conductivity, improve initil output and ultimate recovery.
Volume crack whether is formd for pressure break, and the reservoir that volume crack is smashed is much, current is direct
Monitoring and evaluation method, what industry compared accreditation is micro seismic method, and micro seismic method includes ground micro-seismic and underground microseism.
Underground micro-seismic monitoring principle：Enter multiple three-component testers facing underground, monitoring fractured well transmit due to pressure
Microseism active signal caused by splitting, according to signal, carries out Inversion Calculation, determines whether transformation reservoir forms volume crack.
According to inversion result, it may be determined that the distributed in three dimensions scope in volume crack, spreading direction and relevant dimensioning
It is very little.
The advantages of underground micro-seismic monitoring：1st, it is directly perceived that image is presented；2nd, the distributed in three dimensions in crack is determined；3rd, the spread in crack
Direction.Shortcoming：1st, high cost；2nd, difficulty of construction is big；3rd, computationally intensive, inverting difficulty is big；4th, calculating volume cannot be quantified to split
Seam links up volume.For this we have invented a kind of new method for calculating volume fracturing transformation volume, solve above technology and ask
Topic.
The content of the invention
The present invention be to provide it is a kind of calculate pit shaft and the reserve coefficient in crack using Well Testing Software, it is counter to release volume fracturing
The pressure break volume transformed.
The purpose of the present invention can be achieved by the following technical measures：The method for calculating volume fracturing transformation volume, the meter
Calculating the method for volume fracturing transformation volume includes：Step 1, the pressure drop data of pressure break is enrolled；Step 2, to pressure drop data into
Row well testing is handled, and draws in-place permeability, skin factor, calculates well storage coefficient；Step 3, coefficient is stored up according to well, it is counter to release liquid
Body links up cumulative volume；Step 4, according to fluid communication cumulative volume, petrographic province transformation volume is calculated.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, before construction, temperature meter is pressed into under pressing crack construction tubing string lower going-into-well in shaft bottom, when carrying out pressing crack construction,
Pressure temperature meter to pressing crack construction carry out dynamic monitoring, obtain corresponding pressure parameter and stored, after construction, press temperature meter with
Fracturing string takes out, and then data are played back and explained.
In step 2, the formula of calculating well storage coefficient is：
Wherein：
C：Well stores up coefficient, m3/MPa；
K：In-place permeability, mdc；
μ：Viscosity of crude, mpa.s；
T：Time, h；
S：Skin factor.
In step 3, the defined formula of coefficient is stored up according to well：
Wherein：
C：Well stores up coefficient, m3/MPa；
ΔV：Volume change, m3；
ΔP：Pressure variety, MPa；
C0：Oil compressibility, MPa-1；
V：Fluid communication cumulative volume, m3；
Drawn by formula (2)：
In step 4, the formula of calculating petrographic province transformation volume is：
Wherein
Por：Porosity, %
V0：Wellbore volume, m3。
The method for calculating volume fracturing transformation volume in the present invention, enrolls the shut-in pressure drop after pressure break, according to pressure
The data of power drop, pit shaft and the reserve coefficient in crack are calculated using Well Testing Software, the anti-volume released pressure break and transformed, so that
Realize the rocky areas volume that quantitative calculating volume fracturing is transformed.Physical principle of the present invention is clear, and calculation formula is simple, does not have
The model for having complexity calculates and Optimal Fitting, and result of calculation is succinctly directly perceived, is very suitable for the evaluation of Fracturing Effect on Compact Sandstone at scene.
Brief description of the drawings
Fig. 1 is the flow chart of a specific embodiment of the method for calculating volume fracturing transformation volume of the present invention；
Fig. 2 is the schematic diagram of the monitoring device used in the specific embodiment of the present invention；
Fig. 3 is that schematic diagram of the temperature meter with operating tool string tripping in layer position is pressed in the specific embodiment of the present invention；
Fig. 4 is the pressure drop data figure after pressure break in a specific embodiment of the invention；
Fig. 5 is that well stores up coefficient calculating figure in a specific embodiment of the invention.
Embodiment
For enable the present invention above and other objects, features and advantages become apparent, it is cited below particularly go out preferable implementation
Example, and coordinate shown in attached drawing, it is described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart for calculating volume fracturing and transforming the method for volume of the present invention.
In step 101, the pressure drop data of pressure break is enrolled.
Before construction, temperature meter is pressed, when carrying out pressing crack construction, to press temperature meter to pressure with pressing crack construction tubing string lower going-into-well in shaft bottom
Split construction and carry out dynamic monitoring, obtain corresponding pressure parameter and stored.After construction, temperature meter is pressed to be taken with fracturing string
Go out, then data are played back and explained.Monitoring device is made of support cylinder and pressure temperature meter.As shown in Fig. 2, pressure temperature meter is positioned at support
In cylinder card slot, support cylinder is connected by hoop with operating tool string.
In step 102, well testing processing, calculates well storage coefficient.
Using existing Well Testing Software, well testing processing is carried out to drop of pressure data, draws in-place permeability, skin factor
Deng, calculate well storage coefficient：
Wherein：
C：Well stores up coefficient, m3/MPa
K：In-place permeability, mdc
μ：Viscosity of crude, mpa.s
T：Time, h
S：Skin factor.
In step 103, coefficient is stored up according to well, it is anti-to release fluid communication cumulative volume.
The physical significance of bottom-hole storage constant C：
In closing well situation, it is when wellbore pressure reduces 1MPa, Cm can be discharged by the elastic energy of pit shaft Crude Oil3It is former
Oil.After pressure break, this " empty pit shaft " may be considered total effect of actual pit shaft and chicken-wire cracking.Therefore well storage coefficient C just reacts
The volume size of chicken-wire cracking.According to the defined formula of reserve coefficient：
Wherein：
C：Well stores up coefficient, m3/MPa
ΔV：Volume change, m3
ΔP：Pressure variety, MPa
C0：Oil compressibility, MPa-1
V：The sum of wellbore volume and communication crevice volume, m3
Drawn by formula (2)：
In step 104, petrographic province transformation volume is calculated.
The rock volume of transformation is：
Wherein
Por：Porosity, %
V0：Wellbore volume, m3。
It is using the specific embodiment of the present invention below, by the example of a well time, illustrates embodiment：
1st, pressure temperature meter is with operating tool string tripping in layer position
Wang56Jing, 2822-2830 meters of fractured interval, presses temperature meter lower 2800 meters deep.As shown in figure 3, counted for pressure temperature with construction
The schematic diagram of tubing string tripping in layer position.
2nd, pressure drop data is enrolled
When closing well nearly 78 is small after pressure break, pressure drop data is complete.As shown in figure 4, it is the pressure drop data after pressure break
Figure.
3rd, the calculating of well storage coefficient
Pressure drop data is handled by well test analysis, calculates well storage coefficient.Calculated as shown in figure 5, storing up coefficient for well
Figure.
Explain that well storage coefficient is 2.14m3/MPa。
4th, the calculating of volume is transformed
This layer of porosity 0.092, the compressed coefficient 1.6 × 10-3MPa-1, according to formula (4), calculate this volume fracturing
Rock transformation volume：1.45×104m3.And liquid used in this pressure break is 560m3, transformation volume, which is far longer than, actually uses liquid
Amount, has reached the effect of volume fracturing.
Claims (5)
1. calculate the method for volume fracturing transformation volume, it is characterised in that the method for calculating volume fracturing transformation volume includes：
Step 1, the pressure drop data of pressure break is enrolled；
Step 2, well testing processing is carried out to pressure drop data, draws in-place permeability, skin factor, calculate well storage coefficient；
Step 3, coefficient is stored up according to well, it is anti-to release fluid communication cumulative volume；
Step 4, according to fluid communication cumulative volume, petrographic province transformation volume is calculated.
2. the method according to claim 1 for calculating volume fracturing transformation volume, it is characterised in that in step 1, construction
Before, temperature meter is pressed into under pressing crack construction tubing string lower going-into-well in shaft bottom, when carrying out pressing crack construction, pressure temperature is counted to pressing crack construction into action
State monitors, and obtains corresponding pressure parameter and is stored, and after construction, presses temperature meter to be taken out with fracturing string, then logarithm
According to being played back and explained.
3. the method according to claim 1 for calculating volume fracturing transformation volume, it is characterised in that in step 2, calculate
Well storage coefficient formula be：
<mrow>
<mi>C</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mo>(</mo>
<mi>K</mi>
<mi>h</mi>
<mo>/</mo>
<mi>&mu;</mi>
<mo>)</mo>
<mi>T</mi>
</mrow>
<mrow>
<mo>(</mo>
<mn>2.7</mn>
<mo>+</mo>
<mn>1.6</mn>
<mi>S</mi>
<mo>)</mo>
<mo>&times;</mo>
<msup>
<mn>10</mn>
<mn>6</mn>
</msup>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein：
C：Well stores up coefficient, m3/MPa；
K：In-place permeability, mdc；
μ：Viscosity of crude, mpa.s；
T：Time, h；
S：Skin factor.
4. the method according to claim 1 for calculating volume fracturing transformation volume, it is characterised in that in step 3, according to
Well stores up the defined formula of coefficient：
<mrow>
<mi>C</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&Delta;</mi>
<mi>V</mi>
</mrow>
<mrow>
<mi>&Delta;</mi>
<mi>P</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>VC</mi>
<mn>0</mn>
</msub>
<mi>&Delta;</mi>
<mi>P</mi>
</mrow>
<mrow>
<mi>&Delta;</mi>
<mi>P</mi>
</mrow>
</mfrac>
<mo>=</mo>
<msub>
<mi>VC</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein：
C：Well stores up coefficient, m3/MPa；
ΔV：Volume change, m3；
ΔP：Pressure variety, MPa；
C0：Oil compressibility, MPa-1；
V：Fluid communication cumulative volume, m3；
Drawn by formula (2)：
<mrow>
<mi>V</mi>
<mo>=</mo>
<mfrac>
<mi>C</mi>
<msub>
<mi>C</mi>
<mn>0</mn>
</msub>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
5. the method according to claim 4 for calculating volume fracturing transformation volume, it is characterised in that in step 4, calculate
Petrographic province transformation volume formula be：
<mrow>
<msub>
<mi>V</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>V</mi>
<mo>-</mo>
<msub>
<mi>V</mi>
<mn>0</mn>
</msub>
</mrow>
<mrow>
<mi>P</mi>
<mi>o</mi>
<mi>r</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<mfrac>
<mi>C</mi>
<msub>
<mi>C</mi>
<mn>0</mn>
</msub>
</mfrac>
<mo>-</mo>
<msub>
<mi>v</mi>
<mn>0</mn>
</msub>
</mrow>
<mrow>
<mi>P</mi>
<mi>o</mi>
<mi>r</mi>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein
Por：Porosity, %
V0：Wellbore volume, m3。
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| CN201610973236.2A CN107989585A (en) | 2016-10-27 | 2016-10-27 | The method for calculating volume fracturing transformation volume |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100248996A1 (en) * | 2007-10-09 | 2010-09-30 | Christopher Alan Sawdon | Wellbore fluid |
| WO2013130551A2 (en) * | 2012-02-27 | 2013-09-06 | Saudi Arabian Oil Company | Method for transient testing of oil wells completed with inflow control devices |
| CN105243182A (en) * | 2015-09-08 | 2016-01-13 | 中国石油天然气股份有限公司 | Method for calculating dynamic reserve of dense oil fractured horizontal well |
| CN105447238A (en) * | 2015-11-16 | 2016-03-30 | 中石化石油工程技术服务有限公司 | Method for estimating fracturing reformation volume of shale gas horizontal well |
-
2016
- 2016-10-27 CN CN201610973236.2A patent/CN107989585A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100248996A1 (en) * | 2007-10-09 | 2010-09-30 | Christopher Alan Sawdon | Wellbore fluid |
| WO2013130551A2 (en) * | 2012-02-27 | 2013-09-06 | Saudi Arabian Oil Company | Method for transient testing of oil wells completed with inflow control devices |
| CN105243182A (en) * | 2015-09-08 | 2016-01-13 | 中国石油天然气股份有限公司 | Method for calculating dynamic reserve of dense oil fractured horizontal well |
| CN105447238A (en) * | 2015-11-16 | 2016-03-30 | 中石化石油工程技术服务有限公司 | Method for estimating fracturing reformation volume of shale gas horizontal well |
Non-Patent Citations (2)
| Title |
|---|
| 刘鹏超: "利用霍纳曲线求取井筒储集系数的新方法", 《油气井测试》 * |
| 陈晓明等: "直井体积压裂不稳定试井研究_单孔双区模型", 《科学技术与工程》 * |
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Application publication date: 20180504 |