CN107918918A - Based on discharge opeing phenomenon method of the rock core side wall fluid than correcting oil saturation - Google Patents
Based on discharge opeing phenomenon method of the rock core side wall fluid than correcting oil saturation Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012530 fluid Substances 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 98
- 238000012937 correction Methods 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000010779 crude oil Substances 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000012790 confirmation Methods 0.000 claims abstract description 4
- 239000004519 grease Substances 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 4
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 2
- 235000019198 oils Nutrition 0.000 description 66
- 238000010586 diagram Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 230000009172 bursting Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
Present invention offer is a kind of based on discharge opeing phenomenon method of the rock core side wall fluid than correcting oil saturation, including：Step 1, according to oilfield production data, confirmation needs to do the core hole of data processing or offset well has been gone into operation, and has oil-producing, production liquid data；Step 2, porosity compressed correction first is carried out to rock core saturation degree, obtains the core oil saturation after preliminary corrections, water saturation；Step 3, by asking for original oil liquor ratio, the ratio shared by initial discharge liquor crude oil is obtained；Step 4, using the core oil saturation data after preliminary corrections in step 2, rock core water containing saturability data, and the moment original oil liquor ratio of coring being calculated in step 3, oil saturation after being corrected.This has preferable operability with rock core side wall fluid based on discharge opeing phenomenon than correcting the method for oil saturation, has innovation and practicality, easy to spread, and practicable new method is provided for the correction of core oil saturation.
Description
Technical field
The present invention relates to In Oil Field Exploration And Development technical field, especially relates to a kind of discharge opeing phenomenon that is based on the period of coring
Method of the rock core side wall fluid than correcting oil saturation.
Background technology
Core oil saturation error factor complexity is various at present, there is many Mathematical Correction Methods, available auxiliary
Correction data is more：
1st, core oil saturation error factor is more, directly in fact and infeasible according to every factor correction, example
As rock core due to need be put in the several months in -80 DEG C of refrigerating boxes, water cooling is frozen into ice and causes hole bursting by freezing because bursting by freezing, caused by hole
Gap variable quantity is difficult to correct in fact；In addition, grease volatile quantity that grease volatile quantity, the rock core of also rock core cutting are placed for a long time etc.
It also is difficult to directly correct；
2nd, the correction of current rock core saturation degree also has geometry or mathematical method, but there is also some problems, such as angle are inclined
There is no obvious relation between shifting method and error factor, transcendental equation method for solving is very cumbersome；
3rd, after rock core takes out, the solution gas volume in crude oil can significantly expand, and the oil water mixture in rock core be displaced, rock
The heart can also flow directly out after going out cylinder, cause a large amount of losses of oil, water liquid；
4th, found by comparing Various types of data, core hole exploits first time point, can not be flowed out not from rock core side wall
The ratio of moveable oil, irreducible water, the non-movable oil closely flowed directly out from the oil reservoir of rock core side, the ratio of irreducible water.
In order to carry out accurately correcting, it is necessary to establish new method to core oil saturation.We have invented one kind for this
Based on discharge opeing phenomenon method of the period rock core side wall fluid than correcting oil saturation of coring, solves above technical problem.
The content of the invention
The object of the present invention is to provide one kind to have innovative, practicality, beneficial to popularization based on discharge opeing phenomenon rock core
Method of the side wall fluid than correcting oil saturation.
The purpose of the present invention can be achieved by the following technical measures：Based on discharge opeing phenomenon with rock core side wall fluid than correcting
The method of oil saturation, should be included based on discharge opeing phenomenon rock core side wall fluid than correcting the method for oil saturation：Step
1, according to oilfield production data, confirmation needs to do the core hole of data processing or offset well has been gone into operation, and has oil-producing, production liquid data；
Step 2, porosity compressed correction first is carried out to rock core saturation degree, obtains the core oil saturation So ' after preliminary corrections, aqueous
Saturation degree Sw '；Step 3, by asking for original oil liquor ratio O0/L0, obtain the ratio shared by initial discharge liquor crude oil；Step 4, it is sharp
With the core oil saturation data So ' after preliminary corrections in step 2, rock core water containing saturability data Sw ', and in step 3
The moment original oil liquor ratio O that cores being calculated0/L0, oil saturation So " after being corrected.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, it is also necessary to confirm, core sealing rate qualification up to standard, core hole, which has been gone into operation, to be referred to start oil-producing,
It is not used for water filling or steam injection.
In step 2, core oil saturation So ', the calculation formula of water saturation Sw ' are So '=So*Bo/ α,
Sw '=Sw*Bo/ α, So is the oil saturation data before correction, and Sw is the water saturation data before correction, and α is pore-body
Contracting correction coefficient is overstock, Bo is crude oil volume change coefficient.
In step 2, pore volume compressed correction data α is to cover to press hole to ooze the experimental data in experiment, so as to obtain
Grease saturation degree after preliminary corrections.
In step 3, after according to coring, the exploitation data of first and secondary time quantum of production, obtain the first time
Unit oil-producing, production liquid three-dimensional data points (t1,O1,L1) and a time time quantum oil-producing, production liquid three-dimensional data points (t2,O2,L2), lead to
Three-dimensional data points linear fit is crossed, pushes away rock core side wall discharge oil, the data point (0, O of liquid when must core0,L0) and original oil liquor ratio
O0/L0.If the total duration after first and second periods is equal to twice of first period duration, i.e. t2=
2t1, then O0=2O1-O2, L0=2L1-L2。
In step 4, the final oil saturation calculation formula after correction is So "=So '+(1-So '-Sw ') * O0/L0,
Wherein So ', Sw ' be first revisal after oil, water saturation, O0/L0For original oil liquor ratio.
It is clear based on discharge opeing phenomenon method of the rock core side wall fluid than correcting oil saturation, technical thought in the present invention
Chu, using method that is simple, establishing core oil saturation, there is preferable operability, there is innovative, practicality, profit
In popularization, practicable method is provided for the correction of core oil saturation.
Brief description of the drawings
One based on method of the discharge opeing phenomenon rock core side wall fluid than correcting oil saturation that Fig. 1 is the present invention is specific
The flow chart of embodiment；
Fig. 2 is than correction core oil saturation in a specific embodiment of the invention with period rock core side wall fluid of coring
Schematic diagram；
Fig. 3 is the schematic diagram of three-dimensional computations original oil liquor ratio 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 be the present invention based on discharge opeing phenomenon rock core side wall fluid than correct oil saturation side
The flow chart of method.
Step 101, need to have done the core hole of data processing or well adjacent thereto according to oily area's creation data, confirmation
Go into operation, there is oil-producing, production liquid data；Also need to confirm, core sealing rate qualification up to standard, core hole, which has been gone into operation, to be referred to start to produce
Oil, is not used for water filling or steam injection.
Step 102, for such core hole, porosity overburden pressure correction is first completed, obtains the rock core oil-containing after preliminary corrections
Saturation degree So ', water saturation Sw ', wherein So '=So*Bo/ α, Sw '=Sw*Bo/ α, α are pore volume compressibility, Bo
For crude oil volume change coefficient.Fig. 2 is to be corrected in the specific implementation example of the present invention with period rock core side wall fluid ratio of coring
The schematic diagram of core oil saturation.Since rock core side wall is identical with the reservoir properties of side oil reservoir, fluid properties are identical, i.e., not
Moveable oil, irreducible water percentage are identical, therefore the initial oil liquor ratio that rock core side can be used to discharge, and correct the grease damage of rock core
Lose, the oil saturation after being corrected.
It is step 103, identical with the grease component for side wall discharge liquor of coring due to the grease component of rock core side discharge liquor,
By asking for original oil liquor ratio O0/L0, the ratio shared by initial discharge liquor crude oil is obtained, the three-dimensional computations that Fig. 3 is the present invention are original
Fluid than schematic diagram, specific method is according to after coring, and produces the exploitation number at first time point and second time point
According to, obtain first time point day oil-producing, daily output liquid three-dimensional data points (t1,O1,L1) and second time point day oil-producing, day
Produce liquid three-dimensional data points (t2,O2,L2), by three-dimensional data points linear fit, it is oily, liquid to push away rock core side discharge when must core
Data point (0, O0,L0) and original oil liquor ratio O0/L0, wherein O0=(t2*O1-t1*O2)/(t2-t1), L0=(t2*L1-t1*L2)/
(t2-t1).Since the terms and conditions such as reservoir characteristic, fluid properties, pressure difference change are identical, the fluid oil liquor ratio flowed out from rock core,
Equal to the stratum original oil liquor ratio O after operation0/L0。
Step 104, the core oil saturation data So ' after preliminary corrections in step 2, rock core water containing saturability number are utilized
According to Sw ', the moment original oil liquor ratio O that cores being calculated with reference to step 30/L0, oil saturation So "=So ' after being corrected+
(1-So’-Sw’)*O0/L0。
According to above standard, it can be achieved that with core period rock core side wall fluid than correct core oil saturation method.
Flow terminates.
In the specific embodiment of the application present invention, 1 well is examined to Zheng 411- and has carried out the error of core oil saturation
Correct, specifically included following steps：
In step 1, according to oily area's creation data, confirm to need Zheng 411- for doing data processing to examine 1 offset well oil-producing production liquid
Data, core hole time are 29-30 days in October, 2011, the moon 75 tons of oil-producing, produce 120 tons of water, produce 195 tons of liquid；
In step 2, first according to porosity overburden pressure correction data, pore volume compressed correction factor alpha, crude oil volume are obtained
Variation coefficient Bo is 1.05, and correction calculating formula is So '=So*Bo/ α, Sw '=Sw*Bo/ α, some experimental data and result of calculation
As shown in table 1；
In step 3, after obtaining core hole drilling well, the average day oil-producing at first time point of recovering the oil, daily output liquid volume ratio,
So lack the complex situations of corresponding data for Zheng 411- 1 wells of inspection, handle in the following way.Since this kind of core hole is general
All design in two horizontal well middle positions, can be replaced with close to the corresponding creation data of horizontal well, obtain Zheng 411- 1 wells of inspection and take
Oil-producing, production liquid data after the heart；
In step 4, oil saturation data So, the water saturation data Sw chemically examined using core analysis, obtains certain
Rock sample oil saturation calculating formula is So "=So '+(1-So '-Sw ') * O0/L0, such as the final oil that No. 1 sample is calculated is full
It is with degree：
So "=So '+(1-So '-Sw ') * O0/L0=0.535+ (1-0.535-0.279) * 5.1/13.6=0.605
The final oily saturation degree that No. 2 samples are calculated is：
So "=So '+(1-So '-Sw ') * O0/L0=0.607+ (1-0.607-0.180) * 5.1/13.6=0.687
Similarly, and so on.
1 Zheng 411- of table inspections, 1 core hole part rock sample experimental data correction situation
It is accurate based on discharge opeing phenomenon method of the period rock core side wall fluid than correcting oil saturation of coring, result of calculation
Really, the grease loss amount flowed out in rock core and is corrected using flowable oil-water ratio, correction principle is simple, easy to operate, for meter
Calculate oil saturation and provide effective method.
Claims (6)
1. based on discharge opeing phenomenon method of the rock core side wall fluid than correcting oil saturation, it is characterised in that discharge opeing should be based on
Phenomenon rock core side wall fluid includes than correcting the method for oil saturation：
Step 1, according to oilfield production data, confirmation needs to do the core hole of data processing or offset well has been gone into operation, and has oil-producing, production
Liquid data；
Step 2, first to rock core saturation degree carry out porosity compressed correction, obtain the core oil saturation So ' after preliminary corrections,
Water saturation Sw '；
Step 3, by asking for original oil liquor ratio O0/L0, obtain the ratio shared by initial discharge liquor crude oil；
Step 4, using the core oil saturation data So ' after preliminary corrections in step 2, rock core water containing saturability data Sw ',
And the moment original oil liquor ratio O that cores being calculated in step 30/L0, oil saturation So " after being corrected.
2. it is according to claim 1 based on discharge opeing phenomenon with rock core side wall fluid than correct oil saturation method, its
It is characterized in that, in step 1, it is also necessary to confirm, core sealing rate qualification up to standard, core hole, which has been gone into operation, to be referred to start to produce
Oil, is not used for water filling or steam injection.
3. it is according to claim 1 based on discharge opeing phenomenon with rock core side wall fluid than correct oil saturation method, its
It is characterized in that, in step 2, core oil saturation So ', the calculation formula of water saturation Sw ' are So '=So*Bo/ α,
Sw '=Sw*Bo/ α, So is the oil saturation data before correction, and Sw is the water saturation data before correction, and α is pore-body
Contracting correction coefficient is overstock, Bo is crude oil volume change coefficient.
4. it is according to claim 3 based on discharge opeing phenomenon with rock core side wall fluid than correct oil saturation method, its
It is characterized in that, in step 2, pore volume compressed correction data α is to cover to press hole to ooze the experimental data in experiment, so as to obtain
Grease saturation degree after preliminary corrections.
5. it is according to claim 1 based on discharge opeing phenomenon with rock core side wall fluid than correct oil saturation method, its
It is characterized in that, in step 3, after coring, the exploitation data of first and secondary time quantum of production, obtain the first time
Unit oil-producing, production liquid three-dimensional data points (t1,O1,L1) and a time time quantum oil-producing, production liquid three-dimensional data points (t2,O2,L2), lead to
Three-dimensional data points linear fit is crossed, pushes away rock core side wall discharge oil, the data point (0, O of liquid when must core0,L0) and original oil liquor ratio
O0/L0If the total duration after first and second periods is equal to twice of first period duration, i.e. t2=
2t1, then O0=2O1-O2, L0=2L1-L2。
6. it is according to claim 1 based on discharge opeing phenomenon with rock core side wall fluid than correct oil saturation method, its
It is characterized in that, in step 4, the final oil saturation calculation formula after correction is So "=So '+(1-So '-Sw ') * O0/L0,
Wherein So ', Sw ' be first revisal after oil, water saturation, O0/L0For original oil liquor ratio.
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| CN201610884784.8A CN107918918B (en) | 2016-10-10 | 2016-10-10 | Method for correcting oil saturation degree by using oil-liquid ratio of side wall of rock core based on liquid drainage phenomenon |
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| CN201610884784.8A CN107918918B (en) | 2016-10-10 | 2016-10-10 | Method for correcting oil saturation degree by using oil-liquid ratio of side wall of rock core based on liquid drainage phenomenon |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095584A (en) * | 2018-01-31 | 2019-08-06 | 中国石油化工股份有限公司 | A kind of reservoir oil water saturation bearing calibration |
| CN110231268A (en) * | 2019-05-31 | 2019-09-13 | 大庆油田有限责任公司 | A kind of analysis method of compact reservoir rock grease preservation pore-size distribution |
| CN112814655A (en) * | 2021-02-26 | 2021-05-18 | 中国石油化工集团有限公司 | Method for correcting saturation of bound water of shale gas reservoir |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095584A (en) * | 2018-01-31 | 2019-08-06 | 中国石油化工股份有限公司 | A kind of reservoir oil water saturation bearing calibration |
| CN110095584B (en) * | 2018-01-31 | 2021-10-29 | 中国石油化工股份有限公司 | Reservoir oil-water saturation correction method |
| CN110231268A (en) * | 2019-05-31 | 2019-09-13 | 大庆油田有限责任公司 | A kind of analysis method of compact reservoir rock grease preservation pore-size distribution |
| CN110231268B (en) * | 2019-05-31 | 2022-07-22 | 大庆油田有限责任公司 | Method for analyzing oil-water occurrence pore size distribution of rock of tight reservoir |
| CN112814655A (en) * | 2021-02-26 | 2021-05-18 | 中国石油化工集团有限公司 | Method for correcting saturation of bound water of shale gas reservoir |
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| CN107918918B (en) | 2021-12-14 |
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