CN109973059A - A kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism - Google Patents
A kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 82
- 239000007924 injection Substances 0.000 title claims abstract description 82
- 230000007246 mechanism Effects 0.000 title claims abstract description 58
- 238000004458 analytical method Methods 0.000 title claims abstract description 29
- 239000011148 porous material Substances 0.000 title claims abstract description 26
- 239000003921 oil Substances 0.000 claims abstract description 73
- 239000003129 oil well Substances 0.000 claims abstract description 58
- 235000019994 cava Nutrition 0.000 claims abstract description 57
- 239000010779 crude oil Substances 0.000 claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 238000005553 drilling Methods 0.000 claims description 25
- 238000006073 displacement reaction Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 12
- VBWSWBQVYDBVGA-NAHFVJFTSA-N uranium-234;uranium-235;uranium-238 Chemical compound [234U].[235U].[238U] VBWSWBQVYDBVGA-NAHFVJFTSA-N 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000005251 gamma ray Effects 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 107
- 229910052757 nitrogen Inorganic materials 0.000 description 55
- 239000007789 gas Substances 0.000 description 37
- 238000005259 measurement Methods 0.000 description 12
- 230000004044 response Effects 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 238000012800 visualization Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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- 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
- E21B47/00—Survey of boreholes or wells
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- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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Abstract
Present invention relates particularly to a kind of rapid analysis methods of fracture-pore reservoir gas injection body mechanism, comprise the steps of: that the individual well of (1) acquisition oil well to be measured is drilled well index, well logging index, production index and/or injectivity index, judge that the possibility Reservoir Body type of oil well to be measured, the Reservoir Body type include 3 kinds according to 4 index comprehensives: Caves Reservoir Body, wide seam type Reservoir Body and microcrack type Reservoir Body；(2) test single-well crude oil configuration stratum oil living, gas solubility and mixed phase degree under formation conditions；(3) according to the Reservoir Body type, the gas solubility and mixed phase degree, analysis obtains gas injection body mechanism.This method simply can accurately judge remaining oil Reservoir Body type, provide the mechanism of gas injection body crude oil extraction, and this method has important directive significance to in-depth gas injection body mechanism understanding and later period gas injection body improvement.
Description
Technical field
The present invention relates to fracture and vug carbonate reservoir nitrogen injection development fields, and in particular to a kind of fracture-pore reservoir gas injection
The rapid analysis method of body mechanism.
Background technique
Tarim Basin fractured-cavernous carbonate reservoir reservoir heterogeneity is extremely strong, reservoir space is various, medium-and-large-sized hole
Cave is most important reservoir space, and crack is main communicating passage；Oil reservoir oil water relation and fluid flow characteristics are complicated simultaneously,
Cause production decline big, primary recovery rate is lower, and the characteristics of " it is high two to surpass three " of oil reservoir cause other process implementing difficulty it is big,
It is at high cost.For this purpose, coming into effect within 2012 nitrogen injection technology, nitrogen injection technology has become Tahe Oilfield of The Tarim Basin note at present
Substituted technique after water.Therefore, fracture-pore reservoir nitrogen injection mechanism is furtherd investigate, in-depth fracture-pore reservoir nitrogen injection raising is adopted
Yield understanding and improvement, are of great significance.
Existing research specifically includes that
By fracture-pore reservoir remaining oil Reservoir Body type be divided into attic oil, remaining oil in cap holes, stream oil, oil film and
Position remaining oil is filled, physical model is visualized using the two-dimensional visualization physical model and 3 D stereo designed and produced, it is clear
Mechanism is supplement stratum energy, gravitational differentiation, displacement.(model step on it is imperial, 2016, doctoral thesis, " fractured-cavernous carbonate reservoir note
Air lift high yield recovery efficiency technique and Study on Correlative Mechanisms ")
It is driven using fracture-pore reservoir visualization solution cavity modeling nitrogen foam, specifying dominant mechanism is gravitational differentiation, drop
Low interfacial tension.(bend ring etc., naphthology notification, the 1st phase of volume 2018,3, " fracture-pore reservoir solution cavity Reservoir Body nitrogen foam
Drive injection parameter and mechanism study ")
For " attic oil " remaining oil, using method for numerical simulation, it is gravity that specify gas injection mechanism, which be mainly main function,
Dividing different displacement, energy supplement and mixed phase is secondary role.(Sun Bo, 2014, Master's thesis, " fracture-pore reservoir gas injection is for oil machine reason
And optimizing research ")
The gas injection body Analysis on Mechanism of early period is concentrated in the Analysis on Mechanism of Caves " attic oil " nitrogen injection, is asked there are following
Topic: the Oil Reservoir Types first is that remaining oil classification of type loses contact with reality, there is also wells other than " attic oil " for actually remaining oil type
Between slit formation；Second is that it is relatively high using physical simulating method cost, generally require device or the visualization of production high temperature and pressure
Device；Third is that using method for numerical simulation, the general method equivalent using permeability, while needing to adjust quantity of parameters, it is bothersome
Arduously, on-site actual situations are detached from；Third is that in actual application, more than nitrogen injection, there is also inject other gases to drive
For crude oil.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism, energy
It is enough simply accurately to judge remaining oil Reservoir Body type, the mechanism of gas injection body crude oil extraction is provided, this method is to in-depth gas injection body
Mechanism understanding and later period gas injection body improvement have important directive significance.
The invention adopts the following technical scheme:
A kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism, which is characterized in that comprise the steps of:
(1) individual well for obtaining oil well to be measured is drilled well index, log well index, production index and/or injectivity index, according to 4
Item index comprehensive judges that the possibility Reservoir Body type of oil well to be measured, the Reservoir Body type include 3 kinds: Caves Reservoir Body, width
Slit formation Reservoir Body and microcrack type Reservoir Body；
(2) test single-well crude oil configuration stratum oil living, gas solubility and mixed phase degree under formation conditions；
(3) according to the Reservoir Body type, the gas solubility and mixed phase degree, analysis obtains gas injection body mechanism；
The individual well is drilled well index and refers in drilling process drilling well emptying or mud leak-off velocity occur；
The well logging index refers to that the Natural Gamma-ray Logging Curves of oil well to be measured, calliper log curve, resistivity logging are bent
Line, acoustic logging, neutron well logging curve and density log curve；
The production index refers to the daily fluid production rate and tired Liquid output of oil well to be measured；
The injectivity index refers to the day water injection capacity and water injection pressure numerical value of oil well to be measured.
In step (1), the individual well for obtaining oil well to be measured is drilled well index, log well index, production index and injectivity index, root
It show that oil well to be measured meets one of 3 kinds of Reservoir Body types according to every 1 index judgement of oil well to be measured, completes 4 indexs and sentence
It has no progeny, the most Reservoir Body types results of frequency of occurrence are exactly the possibility Reservoir Body type of oil well to be measured.
In step (1), according to the individual well be drilled well index oil well i.e. to be measured occur in drilling process drilling well emptying or
Mud leak-off velocity judges the possible Reservoir Body type,
When greater than 45m3When/h, the oil well to be measured is Caves Reservoir Body；
When in 25~45m3When between/h, the oil well to be measured is wide seam type Reservoir Body；
When greater than 5m3/ h is simultaneously less than or equal to 25m3/ h, the oil well to be measured are microcrack type Reservoir Body.
In step (1), the possible Reservoir Body type is judged according to the well logging index, the well logging index includes nature
GR logging curve, calliper log curve, Resistivity log, acoustic logging, neutron well logging curve and density log
Curve, the judgment result displays of each curve oil well to be measured belong to one of Reservoir Body in 3, according to item shown in following table
The result of part, the possibility Reservoir Body type is determined by the Reservoir Body type to occupy the majority；
The GR and KTH of the Natural Gamma-ray Logging Curves of oil well to be measured are 5~15API, and U is greater than 15API, each curve in addition to GR
Amplitude of variation is greater than 50%, then is microcrack type Reservoir Body；GR and KTH is 5~15API, and radioactive uranium content is 10-15AP
For wide seam type Reservoir Body；GR and KTH is 30-135API, zigzag or needle pattern and biggish wavy variation, and power spectrum refers to
It is Caves Reservoir Body that mark display radioactive uranium element, which is greater than 15API,；
The calliper log curve of oil well to be measured shows, hole diameter expanding 5% or less or be slightly serrated then stores up for microcrack type
Collective；Hole diameter expanding 10% or less is slightly serrated then as wide seam type Reservoir Body；Hole diameter expanding 20% or more or abnormal increasing
It is big then be Caves Reservoir Body；
The Resistivity log of oil well to be measured shows that resistivity is in 500-800 Ω m, and curvilinear motion is more violent, is in more
Positive variance is then microcrack type Reservoir Body；Resistivity is in 500-800 Ω m, and curvilinear motion is more violent, is then mostly wide in positive variance
Slit formation Reservoir Body；Resistivity is then obviously Caves Reservoir Body in positive variance less than 200 Ω m；
The acoustic logging of oil well to be measured shows that it is then microcrack type Reservoir Body that sound wave, which is less than 50us/ft,；Sound wave exists
50-65us/ft is then wide seam type Reservoir Body；It is then Caves Reservoir Body that sound wave, which is greater than 50us/ft,；
The neutron well logging curve of oil well to be measured shows that neutron is microcrack type Reservoir Body less than 2%；Neutron is in 2%-
6% is then being wide seam type Reservoir Body；It is Caves Reservoir Body that neutron, which is greater than 6%,；The density log curve of oil well to be measured is aobvious
Show, density is greater than 2.69g/cm3For microcrack type Reservoir Body；Density is 2.55-2.69g/cm3It is then wide seam type Reservoir Body；It is bent
Line is in negative sense needle pattern, and is less than 2.55g/cm3It is then Caves Reservoir Body；
In step (1), the possible Reservoir Body type is judged according to the production index, same day liquid-producing capacity is greater than
45m3When/h and the tired liquid that produces is greater than 20,000 tons, is determined as Caves Reservoir Body；Same day liquid-producing capacity is 25~45m3When/h and tire out production
Liquid is 1~20,000 tons, is determined as wide seam type Reservoir Body；Same day liquid-producing capacity is less than 25m3When/h and the tired liquid that produces is less than 10,000 tons,
It is determined as microcrack type Reservoir Body.
In step (1), the possible Reservoir Body type is judged according to the injectivity index, same day water injection capacity is greater than
45m3When/h and water injection pressure is less than 1MPa, is determined as Caves Reservoir Body；Same day water injection capacity is 25~45m3When/h and water filling
Pressure is 1~10MPa, is determined as wide seam type Reservoir Body；Same day water injection capacity is less than 25m3When/h and water injection pressure is greater than
10MPa is determined as microcrack Reservoir Body.
In step (2), single-well crude oil configuration stratum oil living is chosen, it is real using high temperature and pressure slim-tube displacement under formation conditions
It tests, judges mixed phase degree, recovery ratio >=90% is determined as that miscible-phase displacement, recovery ratio < 90% are immiscible displacement.
In step (3), such as it is judged as that Caves Reservoir Body, the gas solubility are 80m3/m3It below and is non-phase-mixing driving
It replaces, is then gravitational differentiation mechanism；Such as it is judged as wide seam type Reservoir Body, gas solubility 80m3/m3It below and is non-phase-mixing driving
The mechanism replaced is to inhibit water cone and change oil reservoir flow field mechanism；
Such as it is judged as microcrack type Reservoir Body, gas solubility 80m3It below and is immiscible displacement, then to utilize gas
Body penetrates and expands energization mechanism；Such as it is determined as that microcrack type Reservoir Body, gas solubility are greater than 80m3And be miscible-phase displacement,
Then mechanism of intumescence is dissolved for gas and crude oil.
The gas solubility and mixed phase degree are obtained by gas-crude oil phaseexperiment and slim tube driving test.
The invention discloses a kind of fracture-pore reservoir gas injection body mechanism rapid analysis methods.Well is drilled according to individual well first to refer to
Mark, well logging index, production index, injectivity index judge Reservoir Body type, and then judge individual well residue oil type, secondly choose
Single-well crude oil configuration stratum oil living, carries out gas-crude oil phaseexperiment and slim tube driving test, judges gas solubility and mixes
Phase degree is analyzed based on technology finally according to individual well residue oil type, phaseexperiment, slim-tube test scenario outcomes, provides note nitrogen
Mechanism of qi reason.The inventive method is to the understanding for deepening gas injection body displacement crude oil mechanism, and improves later period nitrogen injection effect with weight
The directive significance wanted.
Detailed description of the invention
Fig. 1 Caves Reservoir Body type nitrogen injection mechanism process demonstration graph；
Fig. 1 a: before nitrogen injection；Fig. 1 b: after nitrogen injection；
Fig. 2 wide seam type Reservoir Body type nitrogen injection mechanism process demonstration graph；
Fig. 2 a: before nitrogen injection；Fig. 2 b: after nitrogen injection；
Fig. 3 microcrack type Reservoir Body type nitrogen injection mechanism process demonstration graph；
Fig. 3 a: before nitrogen injection；Fig. 3 b: after nitrogen injection；
Fig. 4 microcrack type Reservoir Body type injecting CO 2 mechanism process demonstration graph；
Fig. 4 a: before injecting CO 2；Fig. 4 b: after injecting CO 2；
1- gas, 2- water, 3- crude oil, 4- oil-CO2Mixture.
Specific embodiment
In order to which the present invention is more clearly understood, now specific embodiments of the present invention are explained in detail, but originally
Invention institute's protection scope is not limited only to this.
Embodiment 1: the rapid analysis method 1 of fracture-pore reservoir gas injection body mechanism
(1) well index is drilled according to individual well, log well index, production index and injectivity index comprehensive descision Reservoir Body type；
1) individual well is drilled well index
1# oil well is located at Northern Margin of Tarim Basin, Xinjiang, finishing drilling on May 17 in 1999, finishing drilling well depth 5612.7m, finishing drilling layer position Austria
It unites under pottery ware；In drilling process, 5410-5420m emptying, and occur severe mud losses (mud leak-off velocity be greater than 45m3/ h), because
This is drilled well index according to individual well and judges Reservoir Body type for Caves, and individual well is drilled well index and judges that possible Reservoir Body type is
Caves.
2) well logging index
Table 1: well logging index judgment criteria
Well logging index show, 5410-5420m, natural gamma (GR) well logging, high level response (30-135API), zigzag or
Needle pattern and biggish wavy variation；Power spectrum index display portion radioactive uranium element (U) content height (> 15API) (solution cavity
Type)；Hole diameter measurement, it is expanding obvious (being greater than 20%) (Caves)；Resistivity value is lower, is 50 Ω m, abnormal to reduce, hence it is evident that be in
" positive variance " (Caves)；Sound wave, higher response characteristic, 120us/ft (Caves)；Neutron is in high level response characteristic, is greater than
3% (Caves)；Density log, low value response characteristic are in negative sense needle pattern, numerical value 2.3g/cm3(Caves), therefore, foundation
Well logging index judges possible Reservoir Body type for Caves.
3) production index
Oil jacket conjunction is adopted after complete well, and initial stage produces crude oil daily by 62m3, after turn pumping production, end 2 months 2012, tire out produce liquid
44.61×104T tires out oil-producing 17.65 × 104 t, therefore judge possible Reservoir Body type for Caves according to production index.
4) injectivity index
Start on September 12nd, 2006 water filling and carried out the water filling of 7 rounds at present for oil for oil, water injection pressure 0, or even falls
It inhales, therefore judges possible Reservoir Body type for Caves according to injectivity index.
By being drilled well index, index of logging well, production index and injectivity index must judge that possible Reservoir Body type is all molten
Hole type further judges the well Reservoir Body type for Caves.
(2) test single-well crude oil configuration stratum oily gas solubility and mixed phase degree under formation conditions living；
1) using the crude oil phaseexperiment of high temperature and pressure PVT measurement nitrogen -1# oil well
High temperature and pressure PVT device: the visual window of PVT test cell is made of high pressure quartz glass, and maximum volume is
300mL, PVT test cell form volume are 90mL, PVT test cell dead volume < 10mL.Maximum working pressure is 70MPa,
The thermometric upper limit is 200 DEG C.Inside there is the piston that can move up and down, can be adjusted by adjusting piston position in visual test cell
The volume of pressure and PVT test cell.Thermocouple is placed in it, for detecting the temperature of system in visual PVT test cell, is surveyed
Determining precision is ± 0.3 DEG C.System pressure is measured by precision pressure sensor, and system of systems pressure precision is ± 0.01MPa.Balance
The volume of oily phase is read by CCD camera system under state, and volume accuracy is ± 0.001mL.
Test condition: 120 DEG C, 60MPa；
Measurement result: nitrogen is 42m in the solubility of the crude oil of 1# oil well under formation condition3/m3。
2) mixed phase degree is judged using high temperature and pressure slim-tube test
High temperature and pressure slim tube driving test device: injection pumping system: Ruska is automatically pumped, and operating pressure 0~
70.00MPa, operating temperature room temperature, velocity accuracy 0.001mL；Back pressure regulator: 0~70.00MPa of operating pressure, operating temperature
For room temperature~200.0 DEG C；Differential pressure indicator: maximum operating pressure differential 34.00MPa, operating temperature are room temperature；Temperature-controlling system: operating temperature
For room temperature~200.0 DEG C, 0.1 DEG C of temperature-controlled precision；
Test condition: 120 DEG C, 60MPa；
Measurement result: nitrogen acts on the displacement of 1# crude oil, recovery ratio 62%, is non-mixed phase.
(3) the well residue oil type is that Caves remaining oil, nitrogen solubility be low, nitrogen injection is immiscible displacement.
Further analysis, nitrogen is 120 DEG C under the well reservoir condition, the density of 60MPa is 0.35g/cm2, Caves are surplus
Excess oil is concentrated mainly on solution cavity high-order bit, and after injecting nitrogen, solubility of the nitrogen in crude oil is low, nitrogen displacement headspace,
Crude oil decline, oil well resume production, then the well nitrogen injection mechanism is non-mixed phase gravitational differentiation, and specific implementation process is as shown in Figure 1.
In Fig. 1, Fig. 1 a is the schematic diagram of Caves remaining oil, and oil-water interfaces are lifted to producing well spill point or more, high portion
Position remaining oil can not be employed；After Fig. 1 b is nitrogen injection, by gravitational differentiation mechanism, oil-water interfaces decline, crude oil extraction.
Embodiment 2: the rapid analysis method 2 of fracture-pore reservoir gas injection body mechanism
(1) well index is drilled according to individual well, log well index, production index and injectivity index comprehensive descision Reservoir Body type；
1) individual well is drilled well index
2# oil well is located at Northern Margin of Tarim Basin, Xinjiang, belongs to same oil reservoir with 1# oil well.Finishing drilling on November 27 in 2005, finishing drilling
Well depth 5915m unites under the Ordovician system of finishing drilling layer position.It in drilling process, is missed when being drilled into 5878m, leak-off velocity 32.5m3/h,
It is drilled into 5915.0m by force afterwards, misses 437.8m3Mud, no emptying, therefore be drilled well index according to individual well and judge possible Reservoir Body class
Type is wide seam type.
2) well logging index
Judge index is the same as table 1.
Well logging index shows, 5878-5915m, gamma logging, GR (natural gamma) and KTH (no uranium gamma) low (5- of value
15API), and there is certain radioactive uranium content (10-15API) (wide seam type)；Hole diameter is expanding or is slightly serrated (expanding
10% or less) (wide seam type)；Resistivity is low-intermediate value 500-800 Ω m fluctuation, curvilinear motion is more violent, 50% or more variation,
In positive variance (wide seam type or microcrack type)；Sound wave value increases, and fluctuates (wide seam type or Caves) in 50-65us/ft；In
Son well logging, value increase or slightly increase (between 2%-6%) (wide seam type)；Density log, between 2.55-2.69g/cm3It is (wide
Slit formation), judge that Reservoir Body type time width slit formation occupies the majority according to well logging index, therefore index of logging well judges possible Reservoir Body
Type is wide seam type.
3) production index
Self-spray produces after complete well, conventional completed well, and initial stage is produced daily liquid 35t/ days, and 27 stop-spraying April in 2006 turns to take out (CYB-56/
38TH × 2300m), before nitrogen injection, adds up to produce liquid 19347t, oil-producing 10441t, produce water 8906t.Therefore refer to according to exploitation
Mark judges possible Reservoir Body type for wide seam type.
4) injectivity index
It carries out water filling pressure cone in November, 2008 and stops water filling because of the aqueous rapid increase of offset well TK643 well, add up water filling
969m3, average water injection pressure 5MPa, therefore judge possible Reservoir Body type for wide seam type according to injectivity index.
By being drilled well index, index of logging well, it is wide seam type entirely, further that production index and injectivity index, which must judge,
Judge the well Reservoir Body type for wide seam type.
(2) test single-well crude oil configuration stratum oily gas solubility and mixed phase degree under formation conditions living；
Using the crude oil phaseexperiment of high temperature and pressure PVT measurement nitrogen -1# oil well, measurement result shows nitrogen under the conditions of stratum
Gas is 45m in the solubility of the crude oil of 1# oil well3；The displacement of 1# crude oil is made using high temperature and pressure slim-tube test measurement nitrogen
With recovery ratio 67% is non-mixed phase.
(3) the well residue oil type is that wide seam type remaining oil, nitrogen solubility be low, nitrogen injection is immiscible displacement.
Further analysis, nitrogen is 120 DEG C under the well reservoir condition, the density of 65MPa is 0.36g/cm2, wide seam type
Remaining oil is concentrated mainly on local high-order bit, in early period production process, since well water is in sudden and violent property water when producing pressure differential is excessive
It floods or rapid increase, formation water cone causes a large amount of remaining oils in water cone two sides that can not produce；In nitrogen injection oil recovery process, nitrogen is utilized
The inhibition water cone and change oil reservoir flow field mechanism of gas, change bottom water coning form, well week pressure field are promoted to redistribute, reduce water
Cone height, to realize the extraction of well week water cone two sides remaining oil, specific implementation process is as shown in Figure 2.
In Fig. 2, Fig. 2 a is the schematic diagram of wide seam type remaining oil, and bottom water energy is strong, producing pressure differential is excessive cause it is aqueous fast
Speed rises, and forms water cone, and water cone two sides remaining oil can not produce；After Fig. 2 b is nitrogen injection, using nitrogen inhibition water cone and change
Become oil reservoir flow field mechanism, change bottom water coning form, reduce water cone height, produces crude oil.
The rapid analysis method 3 of embodiment 3, fracture-pore reservoir gas injection body mechanism
(1) well index is drilled according to individual well, log well index, production index and injectivity index comprehensive descision Reservoir Body type；
1) individual well is drilled well index
3# well oil well is located at Northern Margin of Tarim Basin, Xinjiang, belongs to same oil reservoir with 1#, 2# oil well.The finishing drilling on the 30th of September in 2008,
Finishing drilling well depth 6011m unites under the Ordovician system of finishing drilling layer position.In drilling process, mud 15.75m is missed when being drilled into 5956m3, it is drilled into
It is leaked when 6002m, misses section: 6002-6011m, add up leakage mud 86.25m3, there is mud leakage in drilling process
Speed is between 5-25m3/ h, therefore be drilled well index according to individual well and judge possible Reservoir Body type for microcrack type.
2) well logging index
Judge index is the same as table 1.
Well logging index shows that 5945.0-6011.0m, gamma logging, GR and KTH value is 5~15API, and U is greater than 15API,
Each curvilinear motion is larger (microcrack type) in addition to GR；It is expanding less than 5% (wide seam type, microcrack type)；Resistivity is low-intermediate value
(550-800 Ω m), curvilinear motion is more violent, is in positive variance (wide seam type, microcrack type)；Sound wave value 10-25us/ft fluctuation
(microcrack type)；Neutron well logging is worth low less than 0.05% (microcrack type)；Density log, value are greater than 2.69g/cm3(microcrack
Type).Therefore microcrack type occupies the majority, and judges possible Reservoir Body type for microcrack type according to well logging index.
3) production index
Self-spray produces after complete well, conventional completed well, and initial stage is produced daily liquid 15t/ days, repairs the pumping (CYB- that walks around on November 7th, 2008
56/38TH × 2300m), before nitrogen injection, add up to produce liquid 3781t, oil-producing 1757t.Therefore it is preserved according to production index judgement
Body type is Caves, and production index judges possible Reservoir Body type for microcrack type.
4) injectivity index
It carries out water filling pressure cone in December, 2008, fills the water 6 rounds, fill the water 1172m average period3, average water injection pressure
11MPa, therefore judge possible Reservoir Body type for microcrack type according to injectivity index.
By being drilled well index, index of logging well, production index and injectivity index must judge, fine fisssure in possible Reservoir Body type
Seam type occupies the majority, and further judges the well Reservoir Body type for microcrack type.
(2) test single-well crude oil configuration stratum oily gas solubility and mixed phase degree under formation conditions living；
Using the crude oil phaseexperiment of high temperature and pressure PVT measurement nitrogen -3# oil well, measurement result shows nitrogen under the conditions of stratum
Gas is 65m in the solubility of the crude oil of 3# oil well3/m3；The displacement of 3# crude oil is made using high temperature and pressure slim-tube test measurement nitrogen
With recovery ratio 73% is non-mixed phase.
3) the well residue oil type is that microcrack type remaining oil, nitrogen solubility be low, nitrogen injection is immiscible displacement.
Further analysis, nitrogen is 120 DEG C under the well reservoir condition, the density of 65MPa is 0.36g/cm2, microcrack type
Remaining oil is concentrated mainly on local high-order bit, in early period production process, since producing formation pressure declines, cause crack closure or
Person blocking, feed flow poor continuity causes distal end remaining oil that can not produce, in nitrogen injection oil recovery process, using nitrogen penetrate and
Expand energization mechanism, exciting water drive involve less than fracture hole body in crude oil, to realize the extraction of well Zhou Yuanduan remaining oil, specifically
Mechanism process is as shown in Figure 3.
In Fig. 3, Fig. 3 a is the schematic diagram of microcrack type remaining oil remaining oil, and strata pressure decline leads to crack closure or stifled
Plug, distal end remaining oil can not produce；After Fig. 3 b is nitrogen injection, energization mechanism, excitement are penetrated and expanded using the nitrogen of nitrogen
Water drive involve less than fracture hole body in crude oil, to realize the extraction of well Zhou Yuanduan remaining oil.
The rapid analysis method 4 of embodiment 4, fracture-pore reservoir gas injection body mechanism
(1) well index is drilled according to individual well, log well index, production index and injectivity index comprehensive descision Reservoir Body type；
1) individual well is drilled well index
1# oil well is located at Northern Margin of Tarim Basin, Xinjiang, finishing drilling on May 17 in 1999, finishing drilling well depth 5612.7m, finishing drilling layer position Austria
It unites under pottery ware；In drilling process, 5410-5420m emptying, and occur severe mud losses (mud leak-off velocity be greater than 45m3/ h), because
This is drilled well index according to individual well and judges possible Reservoir Body type for Caves.
2) well logging index
Judge index is the same as table 1.
Well logging index show, 5410-5420m, natural gamma (GR) well logging, high level response (30-135API), zigzag or
Needle pattern and biggish wavy variation；Power spectrum index display portion radioactive uranium constituent content is high (> 15API) (Caves)；
Hole diameter measurement, expanding obvious or abnormal increase (being greater than 20%) (Caves)；Resistivity value is lower, is 50 Ω m, abnormal to reduce,
Obviously it is in " positive variance " (Caves)；Sound wave, higher response characteristic, 120us/ft (Caves)；Neutron is in high level response characteristic,
Greater than 3% (Caves)；Density log, low value response characteristic are in negative sense needle pattern, numerical value 2.3g/cm3(Caves), therefore
Judge possible Reservoir Body type for Caves according to well logging index.
3) production index
Oil jacket conjunction is adopted after complete well, and initial stage produces crude oil daily by 62m3, after turn pumping production, end 2 months 2012, tire out produce liquid
44.61×104T tires out oil-producing 17.65 × 104T, thus according to production index judge Reservoir Body type for Caves, production index
Judge possible Reservoir Body type for Caves.
4) injectivity index
Start on September 12nd, 2006 water filling and carried out the water filling of 7 rounds at present for oil for oil, water injection pressure 0, or even falls
Inhale, thus according to injectivity index judge may Reservoir Body type for Caves, injectivity index judges possibility Reservoir Body type to be molten
Hole type.
By being drilled well index, index of logging well, production index and injectivity index must judge, solution cavity in possible Reservoir Body type
Type occupies the majority, and further judges the well Reservoir Body type for Caves.
(2) test single-well crude oil configuration stratum oily gas solubility and mixed phase degree under formation conditions living；
CO is measured using high temperature and pressure PVT2The crude oil phaseexperiment of -1# oil well, measurement result show nitrogen under the conditions of stratum
Gas is 150m in the solubility of the crude oil of 1# oil well3；CO is measured using high temperature and pressure slim-tube test2Displacement effect to 1# crude oil,
Recovery ratio is 92%, is mixed phase.
(3) the well residue oil type is Caves remaining oil, CO2Solubility is high, infuses CO2For miscible-phase displacement.
Further analysis, CO2120 DEG C under the well reservoir condition, the density of 60MPa be 0.81g/cm2, Caves residue
Oil is concentrated mainly on solution cavity high-order bit, and Caves residue oil density is 0.79g/cm2, inject CO2Afterwards, CO2Dissolution in crude oil
Degree is high, while CO2It is close with oil density, CO2It sufficiently dissolves and mixes with crude oil, mixed phase is a phase, and dissolves expansion, is opened
Oil well resumes production after well, CO2With crude oil output simultaneously, pressure reduction, the CO of dissolution2Expansion is precipitated, and specific implementation process is as schemed
Shown in 4.
In Fig. 4, Fig. 4 a is the schematic diagram of Caves remaining oil, and oil-water interfaces are lifted to producing well spill point or more, high portion
Position remaining oil can not be employed；Fig. 4 b is note CO2Afterwards, CO2It dissolves and expands with crude oil, crude oil extraction.
Claims (9)
1. a kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism, which is characterized in that comprise the steps of:
(1) individual well for obtaining oil well to be measured is drilled well index, and log well index, production index and/or injectivity index refer to according to 4
The possibility Reservoir Body type of comprehensive descision oil well to be measured is marked, the Reservoir Body type includes 3 kinds: Caves Reservoir Body, wide seam
Type Reservoir Body and microcrack type Reservoir Body；
(2) test single-well crude oil configuration stratum oil living, gas solubility and mixed phase degree under formation conditions；
(3) according to the Reservoir Body type, the gas solubility and mixed phase degree, analysis obtains gas injection body mechanism；
The individual well is drilled well index and refers in drilling process drilling well emptying or mud leak-off velocity occur；
The well logging index refers to the Natural Gamma-ray Logging Curves of oil well to be measured, calliper log curve, Resistivity log, sound
Wave log, neutron well logging curve and density log curve；
The production index refers to the daily fluid production rate and tired Liquid output of oil well to be measured；
The injectivity index refers to the day water injection capacity and water injection pressure numerical value of oil well to be measured.
2. the rapid analysis method of fracture-pore reservoir gas injection body mechanism according to claim 1, which is characterized in that step (1)
In, the individual well for obtaining oil well to be measured is drilled well index, log well index, production index and injectivity index, according to every the 1 of oil well to be measured
Item index judgement show that oil well to be measured meets one of 3 kinds of Reservoir Body types, and after completing 4 indexs judgements, frequency of occurrence is most
More Reservoir Body types results are exactly the possibility Reservoir Body type of oil well to be measured.
3. the rapid analysis method of fracture-pore reservoir gas injection body mechanism according to claim 2, which is characterized in that step (1)
In, well index oil well i.e. to be measured, which is drilled, according to the individual well occurs drilling well emptying or the judgement of mud leak-off velocity in drilling process
The possibility Reservoir Body type,
When greater than 45m3When/h, the oil well to be measured is Caves Reservoir Body；
When in 25~45m3When between/h, the oil well to be measured is wide seam type Reservoir Body；
When greater than 5m3/ h is simultaneously less than or equal to 25m3/ h, the oil well to be measured are microcrack type Reservoir Body.
4. the rapid analysis method of fracture-pore reservoir gas injection body mechanism according to claim 2, which is characterized in that step (1)
In, the possible Reservoir Body type is judged according to the well logging index, and the well logging index includes Natural Gamma-ray Logging Curves, well
Diameter log, Resistivity log, acoustic logging, neutron well logging curve and density log curve, each curve
Judgment result displays oil well to be measured belong to one of Reservoir Body in 3, according to condition shown in following table, the possibility Reservoir Body
The result of type is determined by the Reservoir Body type to occupy the majority；
The GR and KTH of the Natural Gamma-ray Logging Curves of oil well to be measured are 5~15API, and U is greater than 15API, each curvilinear motion in addition to GR
Amplitude is greater than 50%, then is microcrack type Reservoir Body；GR and KTH is 5~15API, and it is wide that radioactive uranium content, which is 10-15AP,
Slit formation Reservoir Body；GR and KTH is 30-135API, zigzag or needle pattern and biggish wavy variation, and power spectrum index is aobvious
Showing that radioactive uranium element is greater than 15API is Caves Reservoir Body；
The calliper log curve of oil well to be measured shows, hole diameter expanding 5% or less or is slightly serrated then as microcrack type Reservoir Body；
Hole diameter expanding 10% or less is slightly serrated then as wide seam type Reservoir Body；Hole diameter expanding 20% or more or abnormal increase then are
Caves Reservoir Body；
The Resistivity log of oil well to be measured shows that resistivity is in 500-800 Ω m, and curvilinear motion is more violent, is in principal-employment more
Different is then microcrack type Reservoir Body；Resistivity is in 500-800 Ω m, and curvilinear motion is more violent, is then mostly wide seam in positive variance
Type Reservoir Body；Resistivity is then obviously Caves Reservoir Body in positive variance less than 200 Ω m；
The acoustic logging of oil well to be measured shows that it is then microcrack type Reservoir Body that sound wave, which is less than 50us/ft,；Sound wave is in 50-
65us/ft is then wide seam type Reservoir Body；It is then Caves Reservoir Body that sound wave, which is greater than 50us/ft,；
The neutron well logging curve of oil well to be measured shows that neutron is microcrack type Reservoir Body less than 2%；Neutron exists in 2%-6%
It is then wide seam type Reservoir Body；It is Caves Reservoir Body that neutron, which is greater than 6%,；The density log curve of oil well to be measured is shown, close
Degree is greater than 2.69g/cm3For microcrack type Reservoir Body；Density is 2.55-2.69g/cm3It is then wide seam type Reservoir Body；Curve is in
Negative sense needle pattern, and it is less than 2.55g/cm3It is then Caves Reservoir Body.
5. the rapid analysis method of fracture-pore reservoir gas injection body mechanism according to claim 2, which is characterized in that step (1)
In, the possible Reservoir Body type is judged according to the production index, and same day liquid-producing capacity is greater than 45m3When/h and tired production liquid is big
In 20,000 tons, it is determined as Caves Reservoir Body；Same day liquid-producing capacity is 25~45m3When/h and the tired liquid that produces is 1~20,000 tons, is determined
For wide seam type Reservoir Body；Same day liquid-producing capacity is less than 25m3When/h and the tired liquid that produces is less than 10,000 tons, is determined as that microcrack type preserves
Body.
6. the rapid analysis method of fracture-pore reservoir gas injection body mechanism according to claim 2, which is characterized in that step (1)
In, the possible Reservoir Body type is judged according to the injectivity index, and same day water injection capacity is greater than 45m3When/h and water injection pressure
Less than 1MPa, it is determined as Caves Reservoir Body；Same day water injection capacity is 25~45m3When/h and water injection pressure is 1~10MPa, is sentenced
It is set to wide seam type Reservoir Body；Same day water injection capacity is less than 25m3When/h and water injection pressure is greater than 10MPa, is determined as that microcrack stores up
Collective.
7. the rapid analysis method of fracture-pore reservoir gas injection body mechanism according to claim 1, which is characterized in that step (2)
In, single-well crude oil configuration stratum oil living is chosen, high temperature and pressure slim tube driving test is used under formation conditions, judges mixed phase journey
Degree, recovery ratio >=90% are determined as that miscible-phase displacement, recovery ratio < 90% are immiscible displacement.
8. the rapid analysis method of -8 any fracture-pore reservoir gas injection body mechanism according to claim 1, feature
It is, in step (3), is such as judged as that Caves Reservoir Body, the gas solubility are 80m3/m3It below and is immiscible displacement,
It is then gravitational differentiation mechanism；Such as it is judged as wide seam type Reservoir Body, gas solubility 80m3/m3It below and is immiscible displacement
Mechanism be inhibit water cone and change oil reservoir flow field mechanism；
Such as it is judged as microcrack type Reservoir Body, gas solubility 80m3Below and it is immiscible displacement, then is wearing using gas
Saturating and expansion energization mechanism；Such as it is determined as that microcrack type Reservoir Body, gas solubility are greater than 80m3And be miscible-phase displacement, then it is gas
Body and crude oil dissolve mechanism of intumescence.
9. the rapid analysis method of -8 any fracture-pore reservoir gas injection body mechanism according to claim 1, the gas
Body solubility and mixed phase degree are obtained by gas-crude oil phaseexperiment and slim tube driving test.
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