CN103364427B - The method that in-place oil shows is identified under drilling fluid solid fluorescence adjuvant exists - Google Patents
The method that in-place oil shows is identified under drilling fluid solid fluorescence adjuvant exists Download PDFInfo
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Abstract
The present invention relates to a kind of drilling fluid solid fluorescence adjuvant exist under identify the method that in-place oil shows.The method take drilling fluid as analytic target, take nuclear magnetic resonance technique as means, completely eliminate the impact that drilling fluid solid fluorescence adjuvant shows Timeliness coverage in-place oil, and can quantitative evaluation oil content of drilling fluid rate, thus solution can be rivals in a contest the use restriction of solid fluorescence adjuvant, to contribute to drilling safety and effect is put forward in speed-raising.The method overcome conventional method to need set up spectrum library and be difficult to quantitative defect, method is more easy, reliable, easily operates.
Description
Technical field
The invention belongs to well logging engineering and fluid core magnetic resonance arts, specifically, the present invention relates to a kind of for identifying the method that in-place oil shows under drilling fluid solid fluorescence adjuvant existence condition.
Background technology
At present for identifying that the method that in-place oil shows has two classes under drilling fluid solid fluorescence adjuvant existence condition: a class surveys method based on the gas of drilling fluid, deviate from total hydrocarbon and C1 ~ C5 composition of gas by gas chromatography on-line checkingi drilling fluid, sentencing knowledge gas survey display by curvilinear characteristic and component characteristics is from adjuvant or in-place oil; Solid fluorescence adjuvant light constituent is low, and heavy constituent is high; Just added fashionable, total gas curve rises fast; Along with the circulation of drilling fluid, adjuvant occurs to dissolve and diffusion, and total hydrocarbon amplitude slowly declines.This method is one method qualitatively, is difficult to quantitatively, when especially just boring chance oil reservoir at the beginning of adding interpolation reagent, is difficult to judge; Bore to meet when forming similar heavy oil tested layer to adjuvant and be also difficult to judge.Another kind of is oil gas analyzing method based on landwaste, is distinguished the hydrocarbon composition of solid fluorescence adjuvant and in-place oil by methods such as quantitative fluorescence, head space gas lighter hydrocarbons chromatogram, hot-vibration sifter chromatogram, rock pyrolysis chromatograms.This method needs first to analyze various solid fluorescence adjuvant, Criterion collection of illustrative plates; In drilling process, being contrasted by the analysis of spectra of landwaste with it, if similar, is the display of adjuvant, otherwise is the true display from in-place oil.The method has two large deficiencies: one is after solid fluorescence adjuvant adds drilling fluid, to circulate to earth's surface again from earth's surface to underground with it, therebetween will through the impact of shaft bottom High Temperature High Pressure, will through the washing away of the long distance of pit shaft, will through drilling the impact of oil reservoir, its composition there occurs many changes, so bad differentiation, be more difficult to quantitatively; Two is along with PDC drill bit (PolycrystallineDiamondCompact, polycrystalline diamond compact bit) widely use, landwaste is Powdered, surface area is large, wash away seriously by drilling fluid, the oil bearing grade of oil reservoir landwaste can significantly reduce, and the recognition methods therefore based on landwaste loses basic condition.
Therefore, current Problems existing needs research and development a kind of easy and simple to handle, under drilling fluid solid fluorescence adjuvant existence condition, accurately can identify and the method for quantitative evaluation in-place oil display.
Summary of the invention
Technical matters to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of for identifying the method that in-place oil shows under drilling fluid solid fluorescence adjuvant existence condition.The method utilizes drilling fluid nuclear magnetic resonance technique can accurately sentence when drilling fluid adds solid fluorescence adjuvant to know and show with quantitative evaluation in-place oil, is reached for oil-gas exploration and development Timeliness coverage and accurate evaluation oil reservoir, puies forward the object that effect provides Quality-Technology to support for drilling engineering.
For achieving the above object, the invention provides and a kind ofly comprise the method that in-place oil shows for identifying under drilling fluid solid fluorescence adjuvant existence condition:
Steps A, the drilling fluid sample taking unguyed body fluorescence additive carries out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, the total area A1 of record standard T2 spectrum;
Step B, takes the drilling fluid sample being added with solid fluorescence adjuvant and carries out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, the total area A2 of record standard T2 spectrum;
Step C, is added with in the drilling fluid sample of solid fluorescence adjuvant and adds relaxation reagent in step B, carries out nuclear magnetic resonance spectroscopy after mixing, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, the total area A3 of record standard T2 spectrum;
Step D, repeats step B and step C, and carries out at a certain distance analyzing continuously with brill;
Whether step e, according in drilling course, have new peak to occur identifying that in-place oil shows in the T2 spectrum after drilling fluid sample adds relaxation reagent.
In one embodiment of the invention, in step e when drilling fluid sample add the T2 after relaxation reagent compose in have new peak to occur time, be then judged to be that in-place oil shows.Then can be interpreted as further boring and be met oil reservoir.
The nuclear magnetic resonance T 2 spectrum obtained in above-mentioned steps A is unimodality.
According to the inventive method, described method is also included in after step e is judged to be in-place oil display, and the new peak area A4 of record standard T2 spectrum, and calculates the step F of the oil content Co of drilling fluid according to the following formula:
Co＝(A4×100/A2)％。
According to the present invention, the nominal sample amount in steps A, step B is W, and its scope is 2 ~ 12g.
In one embodiment of the invention, the actual sampling amount of sample described in steps A is W1, and standardization described in steps A is for carrying out standardization with W/W1 to T2 spectrum.
In another embodiment of the present invention, the actual sampling amount of sample described in step B is W2, and standardization described in step B and C is for carrying out standardization with W/W2 to T2 spectrum.
According to the inventive method, the concentration of relaxation reagent described in step C in drilling fluid is at more than 10000ppm.
In one embodiment of the invention, mix described in step C and undertaken by oscillator.
According to the inventive method, spacing range described in step D is 1 ~ 2m.Spacing described in the present invention, in actual mechanical process, can perform by user or geological design requirement, such as, and 2m point, objective interval 1 meter of 1 point.
In a specific embodiment of the present invention; by the solid fluorescence adjuvant such as sulfonated gilsonite, sulfonated lignite, CXB-1 (Protective agent for hydrocarbon reservoir), CMP-3 (chelating metal amphoteric ion polymer fluid loss additive), non-fluorescence lubricant, the agent of mud colloform texture; join drilling fluid; and add relaxation reagent again after joining drilling fluid; carry out nuclear magnetic resonance spectroscopy respectively, the results are shown in Figure 1 and Fig. 2.
Can be found out by Fig. 1 and Fig. 2, the nuclear magnetic resonance T 2 spectrum of drilling fluid, drilling fluid+0.12% sulfonated lignite and drilling fluid+0.12% sulfonated lignite+relaxation reagent is a peak, and A1=A2, namely these adjuvants do not have NMR response.Visible, sulfonated lignite does not have signal in T2 spectrum, and the solid fluorescence adjuvant such as sulfonated gilsonite, CXB-1, CMP-3, non-fluorescence lubricant, the agent of mud colloform texture is then the same with sulfonated lignite, adds the rear T2 on drilling fluid and composes not impact.
In another specific embodiment of the present invention, by heat and salinity tolerance fluid loss agent, SMP-1 (sulfonated-pheno-formoldehyde resin, for the drilling fluid that salinity is low), SMP-2 (sulfonated-pheno-formoldehyde resin, for the drilling fluid that salinity is high), ammonium salt, CMC-HV (sodium carboxymethyl cellulose, high sticky), CMC-LV (sodium carboxymethyl cellulose, low sticky), macromolecule coating agent, polyacrylic acid potassium join drilling fluid, and add relaxation reagent again after joining drilling fluid, carry out nuclear magnetic resonance spectroscopy respectively, the results are shown in Figure 3 and Fig. 4.
Can be found out by Fig. 3 and Fig. 4, can produce a small peak on the right side of T2 spectrum after ammonium salt adds drilling fluid, disappear after adding relaxation reagent, proving this peak is an aquation peak.Visible, ammonium salt does not affect by the display of drilling fluid nuclear magnetic resonance technique identification crude oil, warm salt resistant filter loss reduction agent, SMP-1, SMP-2, CMC-HV, CMC-LV, macromolecule coating agent, polyacrylic acid potassium are then the same with ammonium salt, on by drilling fluid nuclear magnetic resonance technique identification crude oil display not impact.
The present invention take drilling fluid as object, take nuclear magnetic resonance technique as means, carry out analyzing with brill to the resident fluid that be mixed into solid fluorescence adjuvant, brill are met, because solid fluorescence adjuvant does not affect this technology, so thorough liberation limits the use of solid fluorescence adjuvant, contribute to the Timeliness coverage of oil reservoir, effect is put forward in the speed-raising contributing to drilling well, thus can increase substantially exploration and development benefit.Instant invention overcomes conventional method and be difficult to quantitative defect, method is more easy, reliable, and easily operates.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Fig. 1 is the superposition T2 spectrogram of drilling fluid, drilling fluid+0.12% sulfonated lignite, drilling fluid+0.12% sulfonated lignite+relaxation reagent.
Fig. 2 is the superposition T2 spectrogram after Fig. 1 ordinate amplifies.
Fig. 3 is the superposition T2 spectrogram of drilling fluid, drilling fluid+0.25% ammonium salt, drilling fluid+0.25% ammonium salt+relaxation reagent.
Fig. 4 is the superposition T2 spectrogram after Fig. 3 ordinate amplifies.
Fig. 5 is the superposition T2 spectrogram of drilling fluid+sulfonated gilsonite in embodiment 1, drilling fluid+sulfonated gilsonite+relaxation reagent and drilling fluid+sulfonated gilsonite+in-place oil+relaxation reagent.
Fig. 6 is the superposition T2 spectrogram after Fig. 5 ordinate amplifies.
Embodiment
Describe the present invention in detail below in conjunction with embodiment and accompanying drawing, these embodiments and accompanying drawing only play illustrative effect, are not limited to range of application of the present invention.
Embodiment
Embodiment 1:
In the work progress of S14-7 well, be mixed into 2t sulfonated gilsonite in well depth 1490m.Carry out nuclear magnetic resonance spectroscopy after sampling, then add relaxation reagent and carry out nuclear magnetic resonance again and analyze continuously, the results are shown in Figure 5 and Fig. 6.
Can be found out by Fig. 5 and Fig. 6, the T2 spectrum after drilling fluid+2t sulfonated gilsonite is a peak, and peak area is 26453.97, and the nuclear magnetic resonance T 2 spectrum of drilling fluid+2t sulfonated gilsonite+relaxation reagent is still a peak.Be that spacing adds relaxation reagent analysis continuously subsequently with 2m, find new display peak in well depth 2036m, be judged to be that in-place oil shows, this peak area is 107.61, and as calculated, oil content is 0.41%, logs well to be interpreted as oil reservoir in this section after finishing drilling.
Claims (8)
1. comprise the method that in-place oil shows for identifying under drilling fluid solid fluorescence adjuvant existence condition:
Steps A, the drilling fluid sample taking unguyed body fluorescence additive carries out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, the total area A1 of record standard T2 spectrum;
Step B, takes the drilling fluid sample being added with solid fluorescence adjuvant and carries out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, the total area A2 of record standard T2 spectrum;
Step C, is added with in the drilling fluid sample of solid fluorescence adjuvant and adds relaxation reagent in step B, carries out nuclear magnetic resonance spectroscopy after mixing, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, the total area A3 of record standard T2 spectrum;
Step D, repeats step B and step C, and carries out at a certain distance analyzing continuously with brill;
Step e, in drilling course, when drilling fluid sample add the T2 after relaxation reagent compose in have new peak to occur time, be then judged to be that in-place oil shows.
2. method according to claim 1, is characterized in that: described method is also included in after step e is judged to be in-place oil display, and the new peak area A4 of record standard T2 spectrum, and calculates the step F of the oil content Co of drilling fluid according to the following formula:
Co＝(A4×100/A2)％。
3. method according to claim 1 and 2, is characterized in that: the nominal sample amount in steps A, step B is W, and its scope is 2 ~ 12g.
4. method according to claim 3, is characterized in that: the actual sampling amount of sample described in steps A is W1, and standardization described in steps A is for carrying out standardization with W/W1 to T2 spectrum.
5. method according to claim 3, is characterized in that: the actual sampling amount of sample described in step B is W2, and standardization described in step B and C is for carrying out standardization with W/W2 to T2 spectrum.
6. method according to claim 1 and 2, is characterized in that: the concentration of relaxation reagent described in step C in drilling fluid is at more than 10000ppm.
7. method according to claim 1 and 2, is characterized in that: mix described in step C and undertaken by oscillator.
8. method according to claim 1 and 2, is characterized in that: spacing range described in step D is 1 ~ 2m.
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| CN105604548B (en) * | 2014-11-05 | 2019-01-01 | 中国石油化工股份有限公司 | A kind of formation oil based on oil base drilling fluid sentences knowledge method |
| RU2739783C1 (en) | 2017-03-03 | 2020-12-28 | Хэллибертон Энерджи Сервисиз, Инк. | Chemically marked additives for drilling mud |
| CN109386282B (en) * | 2017-08-09 | 2022-02-15 | 中国石油化工股份有限公司 | Identification method for drilling oil layer under mixed oil drilling fluid condition |
| CN108387670A (en) * | 2018-03-20 | 2018-08-10 | 盘锦中录油气技术服务有限公司 | A method of utilizing the unidentified compound form of hot-vibration sifter component and content identification of hydrocarbon water layer |
| CN111380891B (en) * | 2018-12-29 | 2023-06-30 | 中国石油化工股份有限公司 | Method for constructing drilling fluid stratum oil identification plate and drilling oil layer identification method |
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