CN108952647A - A method of measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure - Google Patents
A method of measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure Download PDFInfo
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- CN108952647A CN108952647A CN201710364038.0A CN201710364038A CN108952647A CN 108952647 A CN108952647 A CN 108952647A CN 201710364038 A CN201710364038 A CN 201710364038A CN 108952647 A CN108952647 A CN 108952647A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 28
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 28
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 239000000470 constituent Substances 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 238000012417 linear regression Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 10
- 238000011161 development Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 93
- 239000007789 gas Substances 0.000 description 62
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 11
- 238000011084 recovery Methods 0.000 description 9
- 239000010779 crude oil Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000341 volatile oil Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000002195 synergetic 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to oil field development technical fields, disclose a kind of method that measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure.The following steps are included: 1) measure the CO of a variety of oil samples using sessile drop method2Minimum miscibility pressure；2) after step 1) measurement, the indoor gas of hanging drop and well stream object composition of corresponding oil sample are measured respectively；3) using the measurement result of step 2) be converted into a variety of oil samples under formation conditions in each oil sample carbon component content；4) relationship for analyzing the minimum miscibility pressure of same carbon constituent content size and a variety of oil samples in measured a variety of oil samples, obtains effect of the different carbon components to oil sample mixed phase；5) influence according to the analysis results presumption the hydrocarbon component of step 4) to oil gas minimum miscibility pressure.Method of the invention can produce for oil field and provide technical support, select suitable the hydrocarbon component and CO according to results of measuring2Combined drive is formed, side by side except unfavorable carbon component in oil sample, improves oil displacement efficiency.
Description
Technical field
The invention belongs to oil field development technical fields, and in particular to a kind of measuring and calculating the hydrocarbon component is to oil gas minimum miscibility pressure shadow
Loud method.
Background technique
The influence factor of oil-gas interfacial tension has very much, and in addition to temperature, pressure, gas component composition is also to influence oil-
The principal element of vapor interface tension.With the continuous expansion of gas drive technology of reservoir sweep at home and abroad field application scale, single gas drive
Many difficulties are faced with, not all oil reservoir is suitable for single gas drive.How advantageous hydrocarbon component and CO used2Combination flooding
Oil effectively improves oil recovery factor using the synergistic effect of complex oil displacing, becomes Petroleum Engineer and solves many technology of reservoir sweep
The key of problem.
In terms of minimum miscibility pressure, sessile drop method is suitable for the measurement of gas-liquid two-phase interfacial tension under high temperature and pressure, the party
Method measurement interfacial tension have the advantages that quickly, accurately, do not disturb that surface, amount of samples is few is widely adopted.
In terms of compound mensuration, gas chromatograph can qualitatively judge the constituent component of saturated hydrocarbons, but not have point
Analysis gas component ability that crude oil interfacial tension is influenced, that is, can not analyze and determine which kind of component is suitable and CO2Complex oil displacing,
And which kind of component it is unfavorable and need in time exclude, liquid chromatograph.
Light oil reservoirs enhanced-gas injection, which drives, improves recovery ratio desk research (petroleum gas journal, 2014,36 (9): 163-166)
In, crude oil property can not only be improved using the drive of rich gas mixed phase well by describing, it also can be further improved oil recovery factor,
But it is to influence the main component of oil recovery factor there is no which kind of component in clear rich gas in text, does not also point out to deposit in rich gas
Inhibit the raising of recovery ratio in certain component.
Western five or two volatile oil reservoirs note nitrogen and the research of enriched gas drive Lab-evaluation (Southwest Petroleum Institute journal, 2001,23 (6):
In 44-47), the author investigation influence of nitrogen flooding and enriched gas drive to volatile oil reservoir oil displacement efficiency, and propose due to economic item
The limitation of part etc., the oil reservoir for being able to achieve note hydro carbons gas miscible displacement of reservoir condition is few, but there is no each in clear rich gas in text
Influence of the kind component to oil displacement efficiency.And will necessarily have the raising that a certain constituent part promotes recovery ratio in rich gas, suitably
Select some component therein or certain several component displacement of reservoir oil that will certainly reduce cost, so that hydrocarbon gas drive is widely answered
With being more advantageous to the raising of crude oil coloured silk yield.
Influence (foreign oil geology, 1995 (3): 42- of the composition of injectant and pressure to oil displacement process in enriched gas drive
61) in, influences of the different composition variations of liquefied petroleum gas of the author investigation injectant from dry gas to 60% to oil displacement process,
The mainly combination of methane (C1) and different content liquefied petroleum gas.But in text and each component (such as C1, C2, C3 is not known
Deng) on the effect of oil displacement efficiency and influence.
Therefore, it is urgent to provide a kind of method that measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure, carry out clearly different carbon
Influence of the component to crude oil minimum miscibility pressure, and then clearly every kind of carbon component is positive to the effect of oil gas mixed phase or disappears
Pole, so as to select suitable the hydrocarbon component and CO under certain pressure conditions2Complex oil displacing is carried out, and for oil gas
In be unfavorable for CO2The gas of drive can also be removed it using method appropriate, can be with while can reduce cost
Further increase the recovery ratio of gas drive oil recovery.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a kind of measuring and calculating the hydrocarbon components to oil
The method that gas minimum miscibility pressure influences is formed a set of clear by combining gas-chromatography, liquid chromatogram and sessile drop method
The hydrocarbon component is suitble to and CO the methods of the affecting laws of oil gas minimum miscibility pressure so as to select2Carry out the hydrocarbon of combination flooding
Component, side by side except the unfavorable carbon component in oil sample.
The present invention provides a kind of method that measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure, and this method includes following step
It is rapid:
1) CO of a variety of oil samples is measured using sessile drop method2Minimum miscibility pressure；
2) after step 1) measurement, the indoor gas of hanging drop and well stream object composition of corresponding oil sample are measured respectively；
3) a variety of oil samples carbon component in each oil sample under formation conditions is converted into using the measurement result of step 2)
Content；
4) the minimum mixed phase of same carbon constituent content size and a variety of oil samples in measured a variety of oil samples is analyzed
The relationship of pressure obtains effect of the different carbon components to oil sample mixed phase；
5) influence according to the analysis results presumption the hydrocarbon component of step 4) to oil gas minimum miscibility pressure.
The main carbon that oil gas minimum miscibility pressure is influenced under the conditions of experimental pressure can be defined using method of the invention
Component analyzes different carbon components to the affecting laws of crude oil mixed phase ability, and then deduces the hydrocarbon component to crude oil minimum mixed phase pressure
The influence of power is CO2Certain reference is provided with light hydrocarbon component complex oil displacing, selects suitable the hydrocarbon component and CO2Form combination flooding
Oil displacement efficiency is improved, in addition, the specific effect according to different carbon components to oil sample mixed phase ability, is discharged original using mode appropriate
Unfavorable carbon component in oil.
Detailed description of the invention
A kind of Fig. 1: flow chart of the method for specific embodiment of the present invention；
Fig. 2: the C of each oil sample under formation conditions in embodiment 11And C2-10Content；
Fig. 3: the C of each oil sample under formation conditions in embodiment 12~C8Content.
Specific embodiment
To keep the present invention easier to understand, below in conjunction with embodiment, the present invention will be described in detail, these embodiment party
Formula only serves illustrative, is not intended to restrict the invention.
The present invention provides a kind of method that measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure, and this method includes following step
It is rapid:
1) CO of a variety of oil samples is measured using sessile drop method2Minimum miscibility pressure；
2) after step 1) measurement, the indoor gas of hanging drop and well stream object composition of corresponding oil sample are measured respectively；
3) a variety of oil samples carbon component in each oil sample under formation conditions is converted into using the measurement result of step 2)
Content；
4) the minimum mixed phase of same carbon constituent content size and a variety of oil samples in measured a variety of oil samples is analyzed
The relationship of pressure obtains effect of the different carbon components to oil sample mixed phase；
5) influence according to the analysis results presumption the hydrocarbon component of step 4) to oil gas minimum miscibility pressure.
According to the present invention, step 1) may include: first using every under high temperature and pressure interfacial tensimeter measurement different pressures
The interfacial tension of kind oil sample, then the minimum miscibility pressure of every kind of oil sample is obtained by linear regression method.
In the present invention, high temperature and pressure interfacial tensimeter measure oil sample interfacial tension concrete operation method in the prior art
Conventional continuous mode is identical, and therefore not to repeat here.Wherein, CO2The extracting (mixed phase process) of oil sample is carried out in hanging drop room.
Preferably, in step 2), using the composition of gas chromatograph for determination gas.
Specifically includes the following steps:
1. collection step 1) in surveyed the indoor gas of hanging drop of the last one pressure spot；
2. using gas chromatograph, the composition of gas is analyzed.
Preferably, in step 2), using the composition of hplc determination well stream object.
Specifically includes the following steps:
1. the well stream object inside hanging drop room is discharged.
2. being analyzed using liquid chromatograph the component of well stream object.
According to the present invention, in step 1), a variety of oil samples refer to be taken in the example interface tension experimental study of oil field
Oil sample, gas measured by step 2) and well stream object composition are the composition of oil sample under experimental conditions.Therefore, in order to obtain
The carbon constituent content of various oil samples under formation conditions, is converted.
According to the present invention, conversion a variety of oil samples under formation conditions adopt in each oil sample by the content of carbon component in step 3)
Formula are as follows:
Ci=Zigas×GOR+Zioil×1……①；
Wherein, Ci: the molar content of each carbon component, Zigas: the molar content of each carbon component, Z in gasioil: in well stream object
The molar content of each carbon component, GOR: dissolved gas oil ratio, N2: N2Molar content.
In the present invention, the dissolved gas oil ratio of oil sample refer to gas volume that oil sample under some strata pressure dissolves (noodles
Part) with ground degassing oil sample volume ratio.Under normal circumstances, it the measurement of dissolved gas oil ratio numerical value: is done using the sample that underground takes
Differential separating experiment obtains the dissolved gas oil ratio of stratum oil sample through flash distillation correction.
N2Molar content refer to the molar content of nitrogen in gas, measuring method are as follows: use gas Chromatographic Determination.
In the present invention, the carbon component is CO2Carbon composition in displacement of reservoir oil gas, in oil sample；The hydrocarbon component is
With CO2Hydrocarbon as combined drive forms, and belongs to the additional hydrocarbon gas and drives.
The present invention is described in detail by the following examples.
Embodiment 1
The present embodiment is for illustrating the method that measuring and calculating the hydrocarbon component of the invention influences oil gas minimum miscibility pressure.
In certain oil field example interface tension process of experimental, 82.5 DEG C of formation temperature, oil sample is respectively initial samples, water
Remaining oil sample and ultra-high water cut stage output oil sample after drive.
The CO of above-mentioned three kinds of oil samples is measured using sessile drop method2Minimum miscibility pressure: pass through high temperature and pressure interfacial tensimeter point
Other measurement experiment pressure since 7MPa, step up for 10MPa, 12MPa, 14MPa, 16MPa, 17MPa, 19MPa, 21MPa,
The interfacial tension of each oil sample under the conditions of 23MPa, 25MPa, 27MPa, 30MPa；And it carries out linear regression and obtains three kinds of oil samples
Minimum miscibility pressure.Data are as shown in table 1.
Table 1
| Sample | Minimum miscibility pressure (MPa) |
| Initial samples | 18.9825641 |
| Remaining oil sample after water drive | 19.79180658 |
| Ultra-high water cut stage output oil sample | 20.82700319 |
Hanging drop indoor gas when collecting the interfacial tension that every kind of oil sample has been surveyed under 30MPa pressure, using gas chromatograph,
The composition of gas is analyzed, the molar content of each carbon component in gas is obtained.By the well stream object discharge inside hanging drop room, adopt
It is analyzed with component of the liquid chromatograph to well stream object, the molar content of each carbon component in well stream object.
It converts to obtain the carbon constituent content of each oil sample under formation conditions by following formula:
Ci=Zigas×GOR+Zioil× 1 ... 1.,
Wherein, Ci: the molar content of each carbon component, Zigas: the molar content of each carbon component, Z in gasioil: in well stream object
The molar content of each carbon component, GOR: dissolved gas oil ratio, N2: N2Molar content.
Specific conversion result is as shown in Figures 2 and 3, after the label 1,2 and 3 in figure respectively represents initial samples, water drive
Remaining oil sample and ultra-high water cut stage output oil sample.As seen from Figure 2, the C of ultra-high water cut stage output oil sample1Content highest, C2-
C10Content it is minimum, the minimum miscibility pressure value highest of the oil sample；The C of initial samples1Content is minimum, C2-C10Content highest,
Its minimum miscibility pressure value is minimum.Analysis can obtain C1Component (methane) inhibits crude oil mixed phase, and C2-C10Component is mixed conducive to crude oil
Phase.In oilfield production, the oil field high for methane content can produce pressure using appropriate reduce, exclude methane, then suitably
The method exploitation for supplementing stratum energy very effective can improve in this way in addition, avoiding the presence of methane when selection enriched gas drive
Recovery ratio.
It can be obtained by Fig. 3, the main component for influencing minimum miscibility pressure is C2、C3、C4、C5, moreover, wherein C4With C2、C3And C5
It is different to the influence of minimum miscibility pressure, C in the sample4Component is unfavorable for oil gas and reaches mixed phase.In other words, rich gas
C in drive6The hydrocarbon component is not to influence minimum miscibility pressure main component, and C4The hydrocarbon component is unfavorable for oil gas mixed phase.
The embodiment of the present invention is described above, above description is exemplary, and non-exclusive, and also not
It is limited to disclosed embodiment.Without departing from the scope and spirit of illustrated embodiment, for the art
Many modifications and changes are obvious for those of ordinary skill.
Claims (5)
1. a kind of method that measuring and calculating the hydrocarbon component influences oil gas minimum miscibility pressure, which is characterized in that this method includes following step
It is rapid:
1) CO of a variety of oil samples is measured using sessile drop method2Minimum miscibility pressure；
2) after step 1) measurement, the indoor gas of hanging drop and well stream object composition of corresponding oil sample are measured respectively；
3) using the measurement result of step 2) be converted into a variety of oil samples under formation conditions in each oil sample carbon component content；
4) minimum miscibility pressure of same carbon constituent content size and a variety of oil samples in measured a variety of oil samples is analyzed
Relationship, obtain effect of the different carbon components to oil sample mixed phase；
5) influence according to the analysis results presumption the hydrocarbon component of step 4) to oil gas minimum miscibility pressure.
2. according to the method described in claim 1, wherein, step 1) includes: to be measured first using high temperature and pressure interfacial tensimeter
The interfacial tension of every kind of oil sample under different pressures, then the minimum miscibility pressure of every kind of oil sample is obtained by linear regression method.
3. according to the method described in claim 1, wherein, in step 2), using the composition of gas chromatograph for determination gas.
4. according to the method described in claim 1, wherein, in step 2), using the composition of hplc determination well stream object.
5. according to the method described in claim 1, wherein, the formula used is converted in step 3) are as follows:
Ci=Zigas×GOR+Zioil×1……①；
Wherein, Ci: the molar content of each carbon component, Zigas: the molar content of each carbon component, Z in gasioil: each carbon in well stream object
The molar content of component, GOR: dissolved gas oil ratio, N2: N2Molar content.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109779581A (en) * | 2019-01-17 | 2019-05-21 | 中国石油天然气股份有限公司 | A method for carbon dioxide miscible flooding in high miscible pressure reservoirs |
| CN115478819A (en) * | 2021-05-31 | 2022-12-16 | 中国石油化工股份有限公司 | CO reduction based on oil reservoir degassing 2 Method for driving out minimum miscible pressure |
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| CN115478819A (en) * | 2021-05-31 | 2022-12-16 | 中国石油化工股份有限公司 | CO reduction based on oil reservoir degassing 2 Method for driving out minimum miscible pressure |
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Application publication date: 20181207 |