CN102692363A - Method for forecasting crude oil viscosity before oil production test of exploratory well - Google Patents
Method for forecasting crude oil viscosity before oil production test of exploratory well Download PDFInfo
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Abstract
The invention relates to a method for forecasting the crude oil viscosity before the oil production test of an exploratory well. The method comprises the following steps of: directly feeding crude oil or crude oil in oil sand to obtain analysis data by utilizing a comprehensive two-dimensional gas chromatography technology and qualitatively and quantitatively obtaining group composition content of alkane, cycloparaffin, arene and nonhydrocarbon of the crude oil by adopting comprehensive two-dimensional gas chromatography and time-of-flight mass spectrometer analysis software, a comprehensive two-dimensional gas chromatography and time-of-flight mass spectrometer analysis method and a comprehensive two-dimensional gas chromatography separation characteristic; obtaining a multiple correlation weight coefficient and a crude oil viscosity index by utilizing the multiple correlation analysis on the crude oil viscosity and the group composition content of the alkane, the cycloparaffin, the arene and the nonhydrocarbon of the crude oil; and establishing a crude oil viscosity forecasting plate and a relation by utilizing the correlation of the crude oil viscosity index and the crude oil viscosity and calculating to obtain the forecast crude oil viscosity. The method has high accuracy of forecasting the crude oil viscosity, provides reliable basis for an oil production test scheme, the exploration productivity evaluation and research and description on the heterogeneity of an oil reservoir, provides a key parameter for the design of an oil field development scheme and the economic and effective development and has wide application prospect.
Description
Technical field
[0001] the present invention relates to a kind of Forecasting Methodology of Crude viscosity, be specifically related to Forecasting Methodology Crude viscosity before the exploration well oil test pilot production test.
Background technology
[0002] formation testing test is one of key link of oil-gas exploration, is the evaluating oil layer, understands the direct approach of subsurface picture, can be oil-gas exploration and development the reliable geological data is provided.Crude viscosity is one of key parameter of formation testing testing scheme, the design of exploration evaluating production capacity, oilfield development program, economical and effective exploitation, thus before the formation testing test, predict Crude viscosity especially the viscous crude viscosity be the problem of concern always.
There is bibliographical information to utilize thin-layer chromatography and chromatogram mass-spectrometric technique and aromatic compound prediction biodegradation Crude viscosity, " utilizes the viscosity of aromatic compound prediction biodegradation crude oil " (deposition journal, 2002) referring to Zhao Hongjing, Yin Fanju, Zhang Min etc.; Utilize ground data prediction Crude viscosity such as biomarker, " utilize groundization parameter prediction heavy crude reservoir exploitation difficulty " (petroleum journal, 2004) referring to Zhao Hongjing, Zhang Chunming, plum blog article etc.; Utilize high temperature gas chromatography technology and C
40+ (%) high-molecular-weight hydrocarbons compounds oil reservoir prediction remaining oil viscosity, referring to Zhang Ju and " method of testing of oil reservoir remaining oil viscosity " (Chinese invention patent 200810056582.x) such as, Feng Zihui, Fang Wei, or the like.The method of above-mentioned these prediction crude oil and viscous crude viscositys generally adopts a kind of, several kinds or a compounds to set up correlativity with crude oil and viscous crude viscosity and predict its viscosity, in the scientific research of oil-gas exploration and development and production, has brought into play vital role.
Summary of the invention
The purpose of this invention is to provide a kind of comprehensive two dimensional gas chromatography technology (method of prediction Crude viscosity of GC * GC-FID) of utilizing; The present invention utilizes comprehensive two dimensional gas chromatography technology (group composition and the separation detection characteristic of GC * GC-FID); Crude oil direct injected in crude oil or the oil-sand is detected acquisition alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon system component and content; Utilize the multiple correlation property of these family's components and Crude viscosity, set up Crude viscosity prediction plate and method.
The Forecasting Methodology of Crude viscosity before the exploration well oil test test provided by the invention comprises following steps:
1) gathers crude oil and oil sands sample; Crude oil sample is taken from well mouth of oil well or specimen etc.; Crude oil sample is pressed CNS GB265-88 " petroleum products kinematic viscosity determination method and kinetic viscosity computing method " and is obtained Crude viscosity; Oil sands sample is taken from the prospect pit rock core, and oil sands sample adopts the mechanical-physical method to extract organic sample and obtains crude oil in the oil-sand;
2) crude oil in crude oil that step 1) is obtained and the oil-sand adds isopyknic carbon disulphide (chromatographically pure) solvent, obtains crude oil or oil-sand Central Plains oil solution;
3) to step 2) solution that obtains carries out the comprehensive two dimensional gas chromatography analysis, obtains the comprehensive two dimensional gas chromatography analysis data of crude oil in crude oil and the oil-sand;
4) comprehensive two dimensional gas chromatography that step 3) is obtained is analyzed data; Utilize comprehensive two dimensional gas chromatography-flying time mass spectrum analysis software and method; In conjunction with family's component stalling characteristic of comprehensive two dimensional gas chromatography etc., comprehensive two dimensional gas chromatography is analyzed data, and to carry out family's component of alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon qualitative;
5) family's component qualitative results of utilizing step 4) to obtain is calculated the quantitative result and the content that obtain crude oil alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon component in crude oil and the oil-sand;
6) the crude oil family component concentration that utilizes step 5) to obtain is confirmed correlativity, multiple correlation weight coefficient and the Crude viscosity index of Crude viscosity and its alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon component content;
7) the Crude viscosity index that utilizes step 6) to obtain confirms that the correlativity of Crude viscosity and Crude viscosity index is promptly set up Crude viscosity prediction plate and relational expression;
8) utilize the Crude viscosity index that crude oil family component concentration and step 6) obtain in the oil-sand that step 5) obtains, calculate crude oil Viscosity Index in the oil-sand;
9) crude oil Viscosity Index in the oil-sand that step 8) is obtained, Crude viscosity prediction plate and relational expression that the substitution step 7) obtains are calculated and are obtained the prediction Crude viscosity.
The beneficial effect that the present invention had: crude oil is a kind of complicacy, multi-component uniform homogeneous blend; Main composition is hydro carbons (alkane, naphthenic hydrocarbon, an aromatic hydrocarbons); Also have non-hydrocarbon component (sulfur-bearing, contain oxygen, nitrogen-containing compound etc.) and colloid and bituminous matter etc.; The physicochemical property of crude oil and viscosity, density etc. are to be determined by the chemical composition of crude oil (component and content such as alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon); The size of Crude viscosity is the coefficient results of group composition " multifactor " such as alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon; Therefore, (group composition and the separation detection characteristic of GC * GC-FID) detect crude oil direct injected in crude oil or the oil-sand and obtain alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon component and content to utilize comprehensive two dimensional gas chromatography technology; Utilize the multiple correlation property of these family's components and Crude viscosity, set up Crude viscosity prediction plate and method.The present invention has avoided the general employing of other method a kind of, several kinds or compounds prediction Crude viscosity, and crude oil sample can not guarantee its primitiveness and the error that possibly bring and pollution through pre-treatment; Comprehensive two dimensional gas chromatography is bigger than the column capacity of one dimension gas chromatography or chromatography-mass spectroscopy technology, resolution and highly sensitive, qualitative and quantitative reliability strengthen greatly; Guaranteed the Crude viscosity prediction accuracy; Greatly enrich crude oil and deposited organic quality nodularization information, significant for reservoir geochemistry research and exploratory development.
Description of drawings
Fig. 1 is Crude viscosity and alkane correlation figure;
Fig. 2 is Crude viscosity and naphthenic hydrocarbon correlation figure;
Fig. 3 is Crude viscosity and aromatic hydrocarbons correlation figure;
Fig. 4 is Crude viscosity and nonhydrocarbon correlation figure;
Fig. 5 is Crude viscosity and Crude viscosity exponential dependence figure;
Fig. 6 is the qualitative synoptic diagram of crude oil comprehensive two dimensional gas chromatography family component.
Embodiment
The present invention has mainly proposed the comprehensive two dimensional gas chromatography method of the preceding prediction of exploration well oil test test Crude viscosity; Mainly be according to the comprehensive two dimensional gas chromatography column capacity is big, resolution is separated characteristic with highly sensitive, family's component band etc., qualitative and quantitative reliability strengthens greatly; Alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon that crude oil sample comprehensive two dimensional gas chromatography analysis in crude oil or the oil-sand obtains are formed; Utilize multiple linear regression analysis to obtain the Crude viscosity index; Set up Crude viscosity and Crude viscosity index plate and relational expression, calculate the prediction Crude viscosity.
This embodiment crude oil and oil-sand collection and comprehensive two dimensional gas chromatography analytical approach are accomplished by following step:
1) gathers crude oil and oil sands sample; Crude oil sample is taken from well mouth of oil well or specimen; Crude oil sample is pressed CNS GB265-88 " petroleum products kinematic viscosity determination method and kinetic viscosity computing method " and is obtained Crude viscosity; Oil sands sample is taken from the prospect pit rock core, adopts the mechanical-physical method to extract crude oil in organic sample and the acquisition oil-sand;
2) crude oil in crude oil that step 1) is obtained and the oil-sand adds isopyknic carbon disulphide (chromatographically pure) solvent, obtains crude oil or oil-sand Central Plains oil solution;
3) with step 2) solution that obtains carries out the comprehensive two dimensional gas chromatography analysis, obtains the comprehensive two dimensional gas chromatography analysis data of crude oil in crude oil and the oil-sand; Wherein the comprehensive two dimensional gas chromatography analysis condition is: and U.S. LECO company comprehensive two dimensional gas chromatography (GC * GC-FID); Be furnished with Agilent7890 gas chromatograph and flame ionization ditector (FID) and the hot modulator of four spout twin-stages, control and data processing are Chroma TOF software; The one dimension chromatographic column is DB-Petro:50m * 0.2mm * 0.5 μ m, 80 ℃ of initial temperature, and permanent 0.2 min is raised to 300 ℃ with 2 ℃/min heating rate, constant temperature 30 min; The two dimension chromatographic column is DB-17ht:2m * 0.1mm * 0.1 μ m, 85 ℃ of initial temperature, and permanent 0.2 min is raised to 310 ℃ with 2 ℃/min heating rate, constant temperature 30 min; 300 ℃ of injector temperatures, the split sampling pattern; 320 ℃ of detecting device FID temperature, detecting device make-up gas are high-purity helium; The modulator temperature is higher 30 ℃ than one dimension furnace temperature; Be 10s modulation period, and wherein the hot blow time is 2.5s; Carrier gas is high-purity helium, and the post flow is 1.8ml/min; Combustion gas is a hydrogen, and flow is 45ml/min; Combustion-supporting gas is air, and flow is 450ml/min;
4) comprehensive two dimensional gas chromatography that step 3) is obtained is analyzed data; Utilize comprehensive two dimensional gas chromatography-flying time mass spectrum analysis software and method; Quadrature separation, family's separation, tile effect stalling characteristic and spectrogram in conjunction with comprehensive two dimensional gas chromatography; Below one band is the most weak alkane of polarity; The top is naphthenic hydrocarbon, aromatic hydrocarbons series (monocycle, dicyclo, thrcylic aromatic hydrocarbon, Fourth Ring aromatic hydrocarbons etc.), nonhydrocarbon and biomarker series (Fig. 6) successively, and the component of carrying out alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon is qualitative;
5) the analysis data that component qualitative results that step 4) is obtained and step 3) obtain; Calculate the peak area sum and the total peak area of family's component alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon respectively; Utilize each family's component peaks area divided by total peak area, obtain alkane, naphthenic hydrocarbon, the aromatic hydrocarbons of crude oil family component in crude oil or the oil-sand, the relative percentage composition and the quantitative result of nonhydrocarbon;
6) Crude viscosity that relative percentage composition of crude oil family component that step 5) is obtained and step 1) obtain; Import software and (adopt Microsoft office Excel 2007 softwares; Common software) carries out correlativity and multiple linear regression analysis, obtain the correlativity and the multiple correlation coefficient of crude oil family component alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon and Crude viscosity;
7) multiple correlation coefficient that step 6) is obtained respectively with the sum of products of its alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon content, obtain the Crude viscosity index;
8) Crude viscosity that the Crude viscosity exponential sum step 1) that step 7) is obtained obtains; Import software and (adopt Microsoft office Excel 2007 softwares; Common software) carry out correlation analysis, the relational expression that obtains Crude viscosity index and Crude viscosity is promptly set up oil-sand Crude viscosity prediction plate and formula;
9) crude oil Viscosity Index in the oil-sand that step 8) is obtained, Crude viscosity prediction plate and relational expression that the substitution step 7) obtains are calculated and are obtained the prediction Crude viscosity.
Below be the implementation process of example explanation the inventive method with the crude oil and the prospect pit oil-sand in the distant basin of pine west slope, dragon and tiger bubble, neat family ancient dragon area.
1, geologic background and laboratory sample:
The distant basin of pine west slope is the important Exploration Domain in loose distant basin; Form by western onlap band and two secondary building units of safe health mole track; Be the uniclinal structure of inclining in east, the adjacent concavity district that forms by secondary building units such as dragon and tiger bubble terrace, neat family ancient dragon depression, grand celebration placanticlines, east.Oil gas fields such as new shop, white tone promise are reined in, I new, two stations, Jiang Qiao, Fu Laerji in the exploration of the west slope district of decades, have been found; With Sa Ertu and high estrade oil reservoir is main reservoir and exploration targets, and the hydrocarbon resources that exploration is found mainly is viscous crude and crude oil and rock gas.Show according to Feng Zihui relevant researchs such as (2003); West slope district oil gas is mainly derived from the green hill mouth group and the Nenjiang group hydrocarbon source rock of the ancient dragon depression of neat family of east; So crude oil and 53 in viscous crude sample (table 1) are gathered in west slope, dragon and tiger bubble, neat family ancient dragon area in the distant basin of pine, be Sa Ertu (S), grape flower (P), high estrade (G), Fuyu County (F), Yang Dacheng (Y) oil reservoir crude oil; Gather 16 of the oil sands sample (table 2) of west slope prospect pit river 77, Jiang84Jing, oil reservoir is Sa Ertu (S) and high estrade (G).
2, experimental result and discussion:
Adopt the method for step 1) to gather crude oil and oil sands sample, extract oil-sand Central Plains oil samples, and obtain Crude viscosity data (table 1); Adopt step 2) to the method for step 5) sample is carried out comprehensive two dimensional gas chromatography detection, qualitative, quantitative respectively, obtain alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon component content analysis data (table 1).Adopt step 6) to carry out following experimental study to the method for step 9).
Crude viscosity and comprehensive two dimensional gas chromatography analytical data 1
| Pound sign | Well depth/m | Layer position | Viscosity/mPa.s | Alkane/% | Naphthenic hydrocarbon/% | Aromatic hydrocarbons/% | Nonhydrocarbon/% |
| Du 1-3 | 784.8-789.8 | S | 131.41 | 34.38 | 30.13 | 17.31 | 18.18 |
| Du 20 | 1551.4-1533.3 | S | 28.26 | 74.17 | 7.66 | 9.73 | 8.44 |
| Du 23 | 1178.0-1182.4 | G | 141.00 | 18.77 | 24.56 | 37.50 | 19.17 |
| Du 34 | 1212.4-1210.4 | G | 79.87 | 75.69 | 7.81 | 7.88 | 8.62 |
| Du 43 | 1070.0-1060.6 | S | 261.30 | 16.02 | 18.69 | 38.47 | 26.83 |
| Du 52 | 872.4-866.0 | G | 222.40 | 20.36 | 23.74 | 32.38 | 23.53 |
| Du 60 | 951.6-952.6 | S | 340.20 | 20.58 | 22.37 | 32.57 | 24.49 |
| Du 616 | 731.2-728.8 | S | 202.30 | 19.80 | 30.77 | 36.13 | 13.30 |
| Du 620 | 714.6-717.4 | S | 398.80 | 30.28 | 25.27 | 16.59 | 27.87 |
| Du 75 | 836.6-840.2 | s | 450.00 | 9.62 | 21.55 | 39.81 | 29.02 |
| Du 85 | 1451.0-1452.0 | G | 264.09 | 39.07 | 20.06 | 24.82 | 16.06 |
| Du V-3 | 770.6-789.8 | S | 211.10 | 46.84 | 23.99 | 19.44 | 9.73 |
| Du V-4 | 784.6-788.6 | S | 520.40 | 16.26 | 23.37 | 32.96 | 27.41 |
| Rich 701 | 471.2-481.4 | s | 340.00 | 15.82 | 19.91 | 37.63 | 26.63 |
| Rich 718 | 471.8-481.4 | S | 308.20 | 22.43 | 22.65 | 29.19 | 25.73 |
| River 21 | 607.0-609.2 | s | 300.00 | 24.34 | 24.11 | 16.77 | 34.78 |
| River 37 | 820.0-851.5 | j | 141.00 | 55.18 | 15.84 | 18.31 | 10.67 |
| River 372 | 593.0-602.0 | G | 159.60 | 77.31 | 10.19 | 6.12 | 6.38 |
| River 45 | 443.6-446.8 | s | 330.00 | 9.93 | 17.53 | 38.63 | 33.90 |
| River 55 | 465.8-458.2 | S | 298.50 | 12.71 | 24.50 | 38.17 | 24.62 |
| River 75 | 558.8-560.0 | s | 240.00 | 24.75 | 23.66 | 33.90 | 17.69 |
| Come 65 | 662.4-664.4 | s | 200.70 | 29.76 | 22.53 | 26.76 | 20.95 |
| Ancient 18 | 1966.6-1993.2 | sp | 20.90 | 76.03 | 9.64 | 7.15 | 7.18 |
| Ancient 203 | 2324.0-2248.2 | F | 26.73 | 69.15 | 12.91 | 8.22 | 9.73 |
| Ancient 22 | 1803.8-1802.8 | S | 51.10 | 79.13 | 11.02 | 3.63 | 6.23 |
| Ancient 302 | 2179.4-2083.0 | G | 16.30 | 70.52 | 11.12 | 9.80 | 8.56 |
| Ancient 702 | 1958.2-1991.2 | G | 14.60 | 72.31 | 9.52 | 8.77 | 9.40 |
| Ancient 708 | 2136.6-2143.2 | F | 24.28 | 72.09 | 11.36 | 8.20 | 8.36 |
| Ancient 96 | 1637.0-1634.5 | S | 63.83 | 74.18 | 8.79 | 6.93 | 10.10 |
| Breathe out 10 | 1865.2-1844.6 | P | 6.90 | 83.01 | 6.29 | 5.99 | 4.71 |
| Breathe out 15 | 2269.0-2278.8 | Fy | 15.22 | 77.44 | 12.33 | 4.36 | 5.87 |
| Gold 51 | 1611.6-1613.8 | s | 32.22 | 63.08 | 7.08 | 12.82 | 17.02 |
| Gold 62 | 2017.8-2111.4 | G | 40.19 | 68.39 | 9.57 | 12.02 | 10.02 |
| Gold 88 | 1975.0-1977.0 | S | 60.77 | 75.04 | 9.04 | 6.24 | 9.69 |
| Dragon 124 | 1841.0-1858.6 | s | 23.90 | 79.23 | 7.51 | 5.77 | 7.49 |
| Dragon 23 | 2116.2-2272.6 | Fy | 33.50 | 76.57 | 13.47 | 4.26 | 5.71 |
| Dragon 29 | 1987.2-1934.4 | G | 21.10 | 70.12 | 11.73 | 9.29 | 8.86 |
| Dragon 291 | 1915.4-1841.6 | G | 35.20 | 80.22 | 8.98 | 7.29 | 3.52 |
| Tower 20 | 1170.8-1172.2 | s | 46.10 | 59.65 | 19.17 | 11.86 | 9.32 |
| Tower 22 | 1340.6-1337.0 | S | 101.40 | 31.48 | 30.04 | 21.18 | 17.29 |
| Tower 23 | 1706.6-1708.6 | G | 32.56 | 70.13 | 10.13 | 11.76 | 7.98 |
| Tower 234 | 1934.6-2011.8 | F | 45.20 | 75.26 | 8.16 | 8.15 | 8.42 |
| Tower 251 | 1570.8-1772.6 | P | 34.60 | 76.46 | 6.56 | 8.13 | 8.85 |
| Tower 284 | 2074.0-2173.0 | Fy | 10.20 | 71.20 | 12.99 | 8.95 | 6.86 |
| Tower 30 | 1882.0-1947.2 | F | 17.44 | 77.67 | 7.50 | 6.92 | 7.90 |
| Tower 301 | 1288.8-1289.6 | s | 23.90 | 64.36 | 11.68 | 12.65 | 11.32 |
| English 14 | 2230.8-2403.0 | F | 12.64 | 81.89 | 6.49 | 6.41 | 5.21 |
| English 15 | 1840.8-1777.2 | S | 25.50 | 77.21 | 7.20 | 5.93 | 9.66 |
| English 33 | 1882.6-1905.2 | P | 5.06 | 87.78 | 3.67 | 3.47 | 5.09 |
| English 39 | 2039.0-2042.1 | G | 16.11 | 68.56 | 13.00 | 10.69 | 7.75 |
| English 51 | 2021.0-1923.8 | G | 8.85 | 77.83 | 8.15 | 8.80 | 5.23 |
| English 62 | 1503.0-1495.0 | s | 18.71 | 76.56 | 6.97 | 6.00 | 10.47 |
2.1 the correlativity of Crude viscosity:
Crude viscosity is formed (table 1) with alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon respectively do correlation analysis (Fig. 1, Fig. 2, Fig. 3, Fig. 4); Itself and Crude viscosity are all linear; Related coefficient is respectively 0.8803,0.7287,0.8246,0.8781; Nonhydrocarbon and aromatic hydrocarbons and the remarkable positive correlation of Crude viscosity high-positive correlation, naphthenic hydrocarbon and Crude viscosity, alkane and Crude viscosity high negative correlation; It is thus clear that Crude viscosity has multiple correlation property, be that alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon etc. are formed mutual coefficient result.
2.2 Crude viscosity multiple correlation weight coefficient and Viscosity Index:
Alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon composition in the crude oil are done multiple linear regression analysis with Crude viscosity (table 1), obtain the multiple correlation weight coefficient and be respectively-0.8293,1.2422,1.9715,8.7855, the Crude viscosity index is:
Iv=8.7855 * nonhydrocarbon+1.9715 * aromatic hydrocarbons+1.2422 * naphthenic hydrocarbon-0.8293 * alkane .... (1)
2.3 Crude viscosity prediction plate and formula:
With alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon content difference substitution Crude viscosity exponential formula in the crude oil; Obtain a series of data of Crude viscosity index; Do correlation analysis with Crude viscosity, obtain Crude viscosity index and Crude viscosity and concern plate (Fig. 5), both are linear; Related coefficient is 0.90, and its relational expression and Crude viscosity predictor formula are:
y=0.998x+0.455…………………………………………………………..（2）
2.4 Crude viscosity prediction and result's contrast before the formation testing test:
Alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon content data (table 2) with prospect pit river 77, the analysis of river 84 oil sands sample comprehensive two dimensional gas chromatographies; Substitution formula (1) calculates and obtains prediction Crude viscosity exponent data (table 3); To predict the Crude viscosity exponent data again, substitution formula (2) calculates and obtains prediction Crude viscosity (table 3).
Before the exploration well oil test test, predict that Crude viscosity result (table 3) sees; The prediction Crude viscosity of river 77 well Sa Ertu oil reservoirs, 573.31～579.37m is that 250.12 mPa.s～305.53 mPa.s, prediction well section Crude viscosity (on average) are 280.62 mPa.s; This well section formation testing test actual measurement Crude viscosity is 290.16 mPa.s, and the relative deviation of prediction Crude viscosity and Crude viscosity is 3.34%; Equally; River 84 well Sa Ertu oil reservoir 579.59m～581.09m prediction well section Crude viscosity (on average) is 314.61mPa.s; This well section formation testing test actual measurement Crude viscosity is 309.28mPa.s; The relative deviation of prediction Crude viscosity and Crude viscosity is 1.71%, and is visible, and the accuracy of this method prediction Crude viscosity is high.
Oil sands sample comprehensive two dimensional gas chromatography analytical data 2
| Pound sign | Well depth/m | Layer position | Alkane/% | Naphthenic hydrocarbon/% | Aromatic hydrocarbons/% | Nonhydrocarbon/% |
| River 77 | 537.31 | S | 22.05 | 15.52 | 25.22 | 37.21 |
| River 77 | 537.61 | S | 17.63 | 24.17 | 27.36 | 30.84 |
| River 77 | 573.31 | S | 15.40 | 31.17 | 30.23 | 23.20 |
| River 77 | 574.91 | S | 22.72 | 25.42 | 32.02 | 19.84 |
| River 77 | 577.87 | S | 14.728 | 27.144 | 33.197 | 24.93 |
| River 77 | 579.37 | S | 18.65 | 22.69 | 36.79 | 21.87 |
| River 77 | 585.48 | S | 21.913 | 24.419 | 24.574 | 29.09 |
| River 84 | 593.28 | S | 15.71 | 26.41 | 33.73 | 24.15 |
| River 84 | 579.59 | S | 13.38 | 26.09 | 29.43 | 31.10 |
| River 84 | 580.49 | S | 14.58 | 28.10 | 30.97 | 26.35 |
| River 84 | 581.09 | S | 17.31 | 30.95 | 29.68 | 22.06 |
| River 84 | 594.61 | G | 3.12 | 11.60 | 34.57 | 50.71 |
| River 84 | 595.41 | G | 2.35 | 14.50 | 40.34 | 42.81 |
| River 84 | 596.41 | G | 4.32 | 13.44 | 41.66 | 40.58 |
| River 84 | 597.41 | G | 2.65 | 11.92 | 42.61 | 42.82 |
| River 84 | 598.01 | G | 2.20 | 10.30 | 46.25 | 41.25 |
Predict Crude viscosity contrast table 3 as a result before the formation testing test
Prospect pit river 77 well Sa Ertu oil reservoir 537.31m～537.61m prediction Crude viscosity is between 377.32mPa.s～340.06mPa.s, and 585.48m～593.28m prediction Crude viscosity is between 316.04mPa.s～298.30mPa.s; The high estrade oil reservoir 594.61m of prospect pit river 84 wells～598.01m prediction Crude viscosity is between 451.31mPa.s～524.89mPa.s; It is thus clear that; 2 mouthfuls of well Crude viscosity all present nonuniformity in the vertical; The high estrade oil reservoir of river 84 wells Crude viscosity is apparently higher than the Sa Ertu oil reservoir, for these 2 mouthfuls of well formation testing schemes and exploration in time provide foundation, will foundation be provided for oilfield development program design later on, economical and effective exploitation.
More than overall process through prediction Crude viscosity before instance clear specifically the present invention carrying out crude oil and analysis of oil sands sample comprehensive two dimensional gas chromatography and the exploration well oil test test, the result that this method records can be used for the exploration well oil test scheme and explores crude oil exploratory development such as evaluating production capacity, development plan design, economical and effective exploitation.The present invention has following characteristics:
(1) proposes and set up the preceding comprehensive two dimensional gas chromatography method of predicting Crude viscosity of exploration well oil test test; Can directly advance crude oil sample acquisition analysis data in crude oil and the oil-sand; Utilize comprehensive two dimensional gas chromatography-flying time mass spectrum analysis software and method and comprehensive two dimensional gas chromatography stalling characteristic qualitative, quantitatively obtain the group composition content of alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon; Utilize the multiple correlation property analysis of the group composition content of Crude viscosity and its alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon, obtain the Crude viscosity index; Utilize the correlativity of Crude viscosity index and Crude viscosity to set up Crude viscosity prediction plate and relational expression, calculate and obtain the prediction Crude viscosity.
(2) alkane, naphthenic hydrocarbon, aromatic hydrocarbons, the non-hydrocarbon content of the analysis of Crude viscosity and comprehensive two dimensional gas chromatography are all linear; Nonhydrocarbon and aromatic hydrocarbons and the remarkable positive correlation of Crude viscosity high-positive correlation, naphthenic hydrocarbon and Crude viscosity, alkane and Crude viscosity high negative correlation; The size of Crude viscosity is that alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon etc. are formed polynary results of interaction, utilizes the accuracy of the prediction Crude viscosity that Crude viscosity and multiple correlation and Viscosity Index obtained should be the highest.
(3) this method is used in the west slope oil-gas exploration of the distant basin of pine; Before the formation testing test, predicted the Crude viscosity of 16 well sections of 2 mouthfuls of prospect pits; Crude viscosity all presents nonuniformity in the vertical; The maximum relative deviation of prediction Crude viscosity and Pressure Curve in Oil Testing Well section actual measurement Crude viscosity is 3.34%, and the accuracy of this method prediction Crude viscosity is high, for the exploration well oil test testing scheme and explore evaluating production capacity reliable basis is provided; To design for oilfield development program, economical and effective exploitation provides a kind of key parameter, have a extensive future.
Claims (6)
1. the Forecasting Methodology of Crude viscosity before an exploration well oil test is tested comprises following steps:
1) gathers crude oil and oil sands sample; Crude oil sample is taken from well mouth of oil well or specimen; Crude oil sample is pressed CNS and is obtained Crude viscosity, and oil sands sample is taken from the prospect pit rock core, and oil sands sample adopts the mechanical-physical method to extract organic sample and obtains crude oil in the oil-sand;
2) crude oil in crude oil that step 1) is obtained and the oil-sand adds an amount of carbon disulphide solvent, obtains crude oil or oil-sand Central Plains oil solution;
3) to step 2) solution that obtains carries out the comprehensive two dimensional gas chromatography analysis, obtains the comprehensive two dimensional gas chromatography analysis data of crude oil in crude oil and the oil-sand;
4) comprehensive two dimensional gas chromatography that step 3) is obtained is analyzed data; Utilize comprehensive two dimensional gas chromatography-flying time mass spectrum analysis software and method; Family in conjunction with comprehensive two dimensional gas chromatography separates, quadrature separates, tile effect stalling characteristic, and family's component of comprehensive two dimensional gas chromatography analysis data being carried out alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon is qualitative;
5) family's component qualitative results of utilizing step 4) to obtain is calculated the content and the quantitative result that obtain crude oil alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon component in crude oil and the oil-sand;
6) the crude oil family component concentration that utilizes step 5) to obtain is confirmed correlativity, multiple correlation weight coefficient and the Crude viscosity index of Crude viscosity and its alkane, naphthenic hydrocarbon, aromatic hydrocarbons, non-hydrocarbon component content;
7) the Crude viscosity index that utilizes step 6) to obtain confirms that the correlativity of Crude viscosity and Crude viscosity index is promptly set up Crude viscosity prediction plate and relational expression;
8) utilize the Crude viscosity index that crude oil family component concentration and step 6) obtain in the oil-sand that step 5) obtains, calculate crude oil Viscosity Index in the oil-sand;
9) crude oil Viscosity Index in the oil-sand that step 8) is obtained, Crude viscosity prediction plate and relational expression that the substitution step 7) obtains are calculated and are obtained the prediction Crude viscosity.
2. the Forecasting Methodology of Crude viscosity before the exploration well oil test test according to claim 1; It is characterized in that; Multiple correlation weight coefficient that step 6) obtains and Crude viscosity index are to utilize the multiple linear regression analysis of alkane, naphthenic hydrocarbon, aromatic hydrocarbons, nonhydrocarbon in Crude viscosity and the crude oil to obtain.
3. the Forecasting Methodology of Crude viscosity is characterized in that before the exploration well oil test test according to claim 1, and Crude viscosity prediction plate that step 7) obtains and formula are to utilize the correlation analysis of Crude viscosity and Crude viscosity index to obtain.
4. the Forecasting Methodology of Crude viscosity before the exploration well oil test test according to claim 1; It is characterized in that the crude oil Viscosity Index is that the Crude viscosity exponential formula that crude oil family component concentration substitution step 6) obtains in the oil-sand that obtains of step 5) obtains in the oil-sand that step 8) obtains.
5. the Forecasting Methodology of Crude viscosity before the exploration well oil test test according to claim 1; It is characterized in that; The prediction Crude viscosity that step 9) obtains is a crude oil Viscosity Index in the oil-sand that obtains of step 8), and the prediction Crude viscosity formula that the substitution step 7) obtains obtains.
6. according to the Forecasting Methodology of Crude viscosity before the said exploration well oil test test of claim 1, it is characterized in that said correlativity of step 6) and step 7) and multiple linear regression analysis adopt Microsoft office Excel 2007 softwares.
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| CN104297432A (en) * | 2014-10-22 | 2015-01-21 | 中国石油天然气股份有限公司 | Method for determining resource quantity of deep crude oil cracking gas |
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| CN112147039B (en) * | 2019-06-26 | 2022-04-15 | 中国海洋石油集团有限公司 | Method for predicting crude oil viscosity of complex fault block heavy oil reservoir |
| CN111122381A (en) * | 2019-12-31 | 2020-05-08 | 中法渤海地质服务有限公司 | Regression analysis-based geochemical logging crude oil density prediction method |
| CN111122381B (en) * | 2019-12-31 | 2022-07-15 | 中法渤海地质服务有限公司 | Regression analysis-based geochemical logging crude oil density prediction method |
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