CN105547961B - Retrograde gas condensate saturation degree determines method in exhaustion formula exploitation sandstone gas condensate reservoir reservoir - Google Patents
Retrograde gas condensate saturation degree determines method in exhaustion formula exploitation sandstone gas condensate reservoir reservoir Download PDFInfo
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Abstract
Retrograde gas condensate saturation degree in sandstone gas condensate reservoir reservoir, which is developed, the invention discloses exhaustion formula determines method, including：(1) rock core of actual reservoir is obtained, is cleaned, dried；(2) different oil saturation S are testedoiUnder the conditions of gas phase effective permeability Kegi, determine formula Soi=aln (Kegi) parameter a, b value in+b；(3) formation fluid sample is prepared；(4) rock core is returned into initial reservoir state；(5) rock core mesopore pressure is reduced, record core entry end pressure, outlet pressures, the rock core port of export go out air volume；(6) the gas phase effective permeability K during calculating rock core depletion experiments under the conditions of average pressurefegi；(7) retrograde gas condensate saturation degree S under the conditions of different pressures is calculated in sandstone gas condensate reservoir reservoiroi.The principle of the invention is reliable, simple to be applicable, and has considered the influence of porous media, water saturation and condensate flowing, has had wide market prospects.
Description
Technical field
The present invention relates to petroleum natural gas exploration field exhaustion formula to develop retrograde gas condensate in sandstone gas condensate reservoir reservoir
Saturation degree determines method.
Background technology
Gas condensate reservoir refers to the hydro carbons of underground aggregation under the temperature and pressure of reservoir, heavy component gasoline fraction to kerosene
Cut and a small amount of macromolecule hydro carbons are dispersed in natural gas in homogeneous steam condition, when reservoir pressure is less than its dew-point pressure,
Heavy constituent (condensate) separates out in system, with liquid form preservation in hole, reduces gas phase fluid ability.Accordingly, it is determined that not
With retrograde gas condensate saturation degree under pressure condition, the influence to the loss of quantitative assessment condensate and its to gas phase fluid ability has important
Meaning.High temperature and pressure experiment is to determine the main method of gas condensate reservoir retrograde gas condensate saturation degree at present：One kind is professional standard rule
The fixed constant volume depletion determined for gas condensate reservoir retrograde gas condensate saturation degree experiment (SY/T 5542-2000), another is to adopt
With the core experiment method of testing by means of modern physicses measuring technology.Do not consider yet with the experiment of conventional constant volume depletion porous
The influence of medium, water saturation and condensate flowing, it is determined that retrograde gas condensate saturation degree and porous media in differ greatly (Wang's week
Magnificent LOW PERMEABILITY POROUS MEDIAs influence on the high Phase Behavior of Gas Condensate of oil type containing condensation, drilling technique, 2009,32 (3), 56-59)；This
Outside, porous media retrograde gas condensate saturation degree is directly tested using the modern physicses such as ultrasonic wave measuring technology, experiment test is complicated, difficult
Degree big (Guo Ping, application of the ultrasonic wave in the test of condensate critically connected graph, gas industry, 2001,21 (3)：22-
25)。
The content of the invention
It is an object of the invention to based on conventional core depletion experiments and phase percolation curve method of testing, establish a kind of determine in fact
Exhaustion formula develops the determination method of retrograde gas condensate saturation degree in sandstone gas condensate reservoir reservoir core under the reservoir conditions of border, and this method is former
Reason is reliable, simple to be applicable, and has considered the influence of porous media, water saturation and condensate flowing, has had wide city
Field prospect.
To reach above technical purpose, the present invention provides following technical scheme.
Retrograde gas condensate saturation degree determines method in exhaustion formula exploitation sandstone gas condensate reservoir reservoir, comprises the following steps successively：
(1) rock core of actual reservoir is obtained, is cleaned, dried, test diameter D (cm), length L (cm), permeability K0
(mD), porosity φ (%)；
(2) use for reference in professional standard SY/T5345-2007 " gas-aqueous phase oozes curve test method ", test different oil-containings and satisfy
With degree SoiUnder the conditions of gas phase effective permeability Kegi, determine parameter a, the b value in below equation：
Soi=aln (Kegi)+b
Detailed process is as follows：
1. obtain the natural gas of actual gas condensate reservoir well head output, condensate and stratum water；
2. calculate rock pore volume V=0.25 π LD2φ, and into rock core, injected slurry volume is V (ml) stratum water, is made
Its saturation；
3. injecting condensate into rock core from core entry end, untill the rock core port of export not water outlet, metering is accumulated
Water volume Vw(ml), the volume is initial saturation oil volume Vo, calculate irreducible water saturation Sor=(V-Vw)/V × 100%,
Determine initial oil saturation S in rock coreo=(1-Sor) × 100%；
4. natural gas is injected into rock core from core entry end, at interval of △ t1(s) core entry end pressure P is recorded1i, go out
Mouth end pressure P2i, the rock core port of export go out air volume Vgi(ml) oil volume V, is gone outoi(ml) oil saturation S in rock core, is calculatedoi=
(Vo-Voi)/Vo× 100%；
5. calculating rock core corresponds to oil saturation SoiUnder the conditions of gas phase effective permeability Kegi(mD)：
In formula：
μgi- gas viscosity, mPas, according to the pseudocritical temperature T of natural gaspcWith pseudocritical pressure PpcLook into karr section shellfish
House
Carr Kobayshi and Bu Lu Burrows viscosity plates check in；
L-rock core length, cm；
A-rock core cross-sectional area, cm2, A=0.25 π D2, D-core diameter, cm；
6. analyze oil saturation S in rock coreoi, gas phase effective permeability KegiRelation between the two, determine formula Soi=
aln(Kegi) coefficient a, b value in+b；
(3) according to professional standard SY/T 5542-2000, with reference to dew point in gas reservoir prime stratum fluid properties analysis report
Pressure Pb, single de- gas-oil ratio GOR1Prepare formation fluid sample, i.e. condensate gas sample；
(4) rock core is returned into initial reservoir state, detailed process is：It is used into stratum water saturation, then progressively heat up,
Pressurization, until rock core pore pressure, temperature are consistent with gas reservoir original formation pressure, temperature, it is applied to the radial pressure P of rock cored
Than pore pressure PfHigh 3MPa, then the formation fluid sample of preparation is injected into rock core, exported at interval of 0.5 hour testing rock core
Hold gas-oil ratio GOR2, until and GOR1Unanimously；
(5) gas reservoir depletion experiments process is simulated：According to certain pressure drop rate by reducing rock core outlet pressures P2iRealize
Rock core mesopore pressure is reduced, the radial pressure P of rock core is remained in pressure reductiondThan pore pressure PfHigh 3MPa, at interval of
△t2(S) core entry end pressure P is recorded1i, outlet pressures P2i, the rock core port of export go out air volume Vgi, until the rock core port of export
Pressure P2iIt is reduced to gas reservoir abandonment pressure；
(6) according to average pressure P during following formula calculating rock core depletion experimentsiUnder the conditions of gas phase effective permeability Kfegi,
PiFor core entry end pressure P1iWith outlet pressures P2iAverage value：
(7) by each PiK corresponding to pointfegiBring S intooi=aln (Kegi)+b, a, b value determined according to step (2), calculate
Obtain in sandstone gas condensate reservoir reservoir retrograde gas condensate saturation degree S under the conditions of different pressuresoi。
Compared with prior art, exhaustion formula exploitation gas condensate reservoir retrograde gas condensate saturation degree provided by the invention determines method,
Principle is reliable, easy to operate, economic and practical, has considered the influence of porous media, water saturation and condensate flowing, tool
There are wide market prospects.
Brief description of the drawings
Fig. 1 is oil saturation and gas phase effective permeability relation curve.
Fig. 2 is gas phase effective permeability and pressure relationship plot during gas condensate reservoir During Natural Depletion.
Fig. 3 is that retrograde gas condensate saturation degree change curve is exploited in gas condensate reservoir exhaustion.
Embodiment
The present invention is further illustrated below according to drawings and examples.
Retrograde gas condensate saturation degree determines method in a kind of exhaustion formula exploitation gas condensate reservoir porous media, successively including following step
Suddenly：
(1) obtain certain gas condensate reservoir reservoir core Y-1, cleaning, drying, test diameter D (6.5cm), length L (7.9cm),
Permeability K0(1.12mD), porosity φ (9.5%)；
(2) use for reference in professional standard SY/T5345-2007 " gas-aqueous phase oozes curve test method ", test different oil-containings and satisfy
With degree SoiUnder the conditions of gas phase effective permeability Kegi, as shown in figure 1, and establishing equation between the two：
Soi=-0.39ln (Kegi) -1.105
Detailed process is as follows：
1. obtain certain gas condensate reservoir well head output natural gas, condensate and stratum water；
2. calculate rock pore volume V=0.25 π LD2φ=24.9ml, into rock core, injected slurry volume is 24.9ml ground
Layer water；
3. condensate is injected at core entry end into rock core, untill the rock core port of export not water outlet, and measure and accumulate
Water volume Vw(16ml), the volume are initial saturation oil volume Vo；Calculate irreducible water saturation Sor=100% × (V-Vw)/V
=35.7%, determine initial oil saturation S in rock coreo=100% × (1-0.357)=64.3%；
4. injecting natural gas into rock core from core entry end, core entry end pressure P is recorded at interval of 1200s1i, outlet
End pressure P2i, the rock core port of export go out air volume Vgi(ml) oil volume V, is gone outoi(ml) oil saturation S in rock core, is calculatedoi=
100% × (Vo- Voi)/Vo；
5. calculate corresponding oil saturation SoiUnder the conditions of gas phase effective permeability Kegi：
6. analyze oily saturation degree S in rock coreoi, gas phase effective permeability (Kegi) relation between the two, determine Soi=aln
(Kegi) coefficient a, b in+b, as shown in Figure 1；
(3) according to professional standard SY/T 5542-2000, with reference to dew point in gas reservoir prime stratum fluid properties analysis report
Pressure (34MPa), single de- gas-oil ratio (3010m3/m3) prepare formation fluid sample；
(4) same rock core is used, saturation stratum water, progressively heats up, pressurize, until rock core pore pressure, temperature and gas
It is consistent to hide original formation pressure, temperature, is applied to rock core radial pressure PdThan pore pressure PfHigh 3MPa, is then noted into rock core
Enter to prepare formation fluid sample, at interval of 0.5 hour testing rock core port of export gas-oil ratio GOR2, until 4 times of pore volumes are tested
GOR2(3008m3/m3) and GOR1(3010m3/m3) consistent；
(5) gas reservoir exhaustion recovery process is simulated, rock core mesopore pressure is gradually reduced by discharging formation fluid in rock core,
Rock core pore pressure P is remained in pressure reductionfWith being applied to rock core radial pressure PdDifference is 3MPa, according to pressure drop rate
(1MPa/h) reduces rock core outlet pressures P2iRealizing reduces rock core pore pressure, at interval of △ t2The corresponding rock of (3600s) record
Heart inlet pressure P1i, release air volume Vgi, until P2iIt is reduced to gas reservoir abandonment pressure；
(6) according to core diameter D, length L, inlet port pressure P1i, outlet pressures P2i, time interval △ t2, the port of export
Go out air volume Vgi, according to Darcy formulaAverage pressure P during calculating rock core depletion experimentsi(0.5
×(P1i+P2i)) under the conditions of gas phase effective permeability Kfegi(as shown in Figure 2)；
(7) KfegiBring S intooi=aln (Kegi)+b, condensate saturation degree S under reservoir conditions is calculatedoi, draw pressure
PiWith SoiRelation, so that it is determined that retrograde gas condensate saturation degree (as shown in Figure 3) in rock core under the conditions of different pressures.
Claims (3)
1. retrograde gas condensate saturation degree determines method in exhaustion formula exploitation sandstone gas condensate reservoir reservoir, comprise the following steps successively：
(1) rock core of actual reservoir is obtained, is cleaned, dried, test diameter D, length L, permeability K0, porosity φ；
(2) different oil saturation S are testedoiUnder the conditions of gas phase effective permeability Kegi, determine formula Soi=aln (Kegi) in+b
Parameter a, b value, detailed process is as follows：
1. obtain the natural gas of actual gas condensate reservoir well head output, condensate and stratum water；
2. calculate rock pore volume V=0.25 π LD2φ, and into rock core, injected slurry volume is V (ml) stratum water, makes it full
With；
3. condensate is injected into rock core from core entry end, untill the rock core port of export not water outlet, metering accumulation water-outlet body
Product Vw, the volume is initial saturation oil volume Vo, calculate irreducible water saturation Sor=(V-Vw)/V × 100%, determines rock core
In initial oil saturation So=(1-Sor) × 100%；
4. natural gas is injected into rock core from core entry end, at interval of △ t1Record core entry end pressure P1i, outlet side pressure
Power P2i, the rock core port of export go out air volume Vgi, go out oil volume Voi, calculate oil saturation S in rock coreoi=(Vo-Voi)/Vo×
100%；
5. calculating rock core corresponds to oil saturation SoiUnder the conditions of gas phase effective permeability Kegi：
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In formula：
μgi- gas viscosity, mPas；
L-rock core length, cm；
A-rock core cross-sectional area, cm2, A=0.25 π D2, D-core diameter, cm；
6. analyze oil saturation S in rock coreoi, gas phase effective permeability KegiRelation between the two, determine formula Soi=aln
(Kegi) coefficient a, b value in+b；
(3) with reference to dew-point pressure P in gas reservoir prime stratum fluid properties analysis reportb, single de- gas-oil ratio GOR1Prepare formation fluid
Sample, i.e. condensate gas sample；
(4) rock core is returned into initial reservoir state；
(5) by reducing rock core outlet pressures P2iRealizing reduces rock core mesopore pressure, and rock core is remained in pressure reduction
Radial pressure PdThan pore pressure PfHigh 3MPa, at interval of △ t2Record core entry end pressure P1i, outlet pressures P2i, rock
The heart port of export goes out air volume Vgi, until rock core outlet pressures P2iIt is reduced to gas reservoir abandonment pressure；
(6) according to average pressure P during following formula calculating rock core depletion experimentsiUnder the conditions of gas phase effective permeability Kfegi：
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(7) by each PiK corresponding to pointfegiBring S intooi=aln (Kegi)+b, a, b value determined according to step (2), it is calculated
Retrograde gas condensate saturation degree S under the conditions of different pressures in sandstone gas condensate reservoir reservoiroi。
2. retrograde gas condensate saturation degree determines method in exhaustion formula exploitation sandstone gas condensate reservoir reservoir as claimed in claim 1, its
It is characterised by, rock core is returned to initial reservoir state by the step (4), and detailed process is：It is used into stratum water saturation, then
Progressively heat up, pressurize, until rock core pore pressure, temperature are consistent with gas reservoir original formation pressure, temperature, be applied to the footpath of rock core
To pressure PdThan pore pressure PfHigh 3MPa, then the formation fluid sample of preparation is injected into rock core, tested at interval of 0.5 hour
Rock core port of export gas-oil ratio GOR2, until and GOR1Unanimously.
3. retrograde gas condensate saturation degree determines method in exhaustion formula exploitation sandstone gas condensate reservoir reservoir as claimed in claim 1, its
It is characterised by, step (6) the average pressure PiFor core entry end pressure P1iWith outlet pressures P2iAverage value.
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