CN103362505B - A kind of for sentencing the method known and bore and meet oil reservoir under add oily existence condition at drilling fluid - Google Patents
A kind of for sentencing the method known and bore and meet oil reservoir under add oily existence condition at drilling fluid Download PDFInfo
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Abstract
The present invention relates to a kind of for sentencing the method known and bore and meet oil reservoir under add oily existence condition at drilling fluid.The method take drilling fluid as analytic target, to be quick on the draw to oil, nuclear magnetic resonance technique that the linearity is high is means, under drilling fluid adds oily existence condition, qualitatively can sentencing to know to bore by contrast standard T2 spectrum, T2 cumulative spectra and meet oil reservoir, quantitative assessment can invade in-place oil content and the oil property of pit shaft by contrasting oily peak T2g and oil content of drilling fluid rate.The method overcome that conventional method is difficult to quantitatively, to being mixed into the helpless defect of homology crude oil, method is more easy, reliable, easily operates.
Description
Technical field
The invention belongs to well logging engineering and NMR logging technique field, specifically, the present invention relates to a kind of for sentencing the method known and bore and meet oil reservoir under having drilling fluid to add oily existence condition.
Background technology
At present, under having drilling fluid to add oily existent condition, distinguish drilling fluid and add oil and in-place oil, sentence the method knowing brill chance oil reservoir and have two classes: a class surveys method based on the gas of drilling fluid, total hydrocarbon and C1 ~ C5 composition of gas is deviate from by gas-chromatography on-line checkingi drilling fluid, sentencing knowledge gas survey display by curvilinear characteristic and component characteristics is from interpolation oil or in-place oil, this method is one method qualitatively, be difficult to quantitatively, although some instrument producers have developed difference chromatogram, but owing to being subject to temperature and pressure in circulation of drilling fluid process, the impact of all many condition in stratum, be difficult to prove effective, to helpless especially when being mixed into the in-place oil of homology.Another kind of is oil gas analyzing method based on landwaste, is distinguished the hydrocarbon composition adding oil 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 interpolation oil, Criterion collection of illustrative plates; In drilling process, the analysis of spectra of landwaste is contrasted with it, if similar, for adding the display of oil, otherwise be the true display from stratum, the method is also helpless to the in-place oil being mixed into homology, and there are two large deficiencies: one is after interpolation oil 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 HTHP, will through the impact of washing away, will stand to have drilled oil reservoir of the long distance of pit shaft, its composition there occurs many changes, so bad differentiation, be more difficult to quantitatively; Two is along with PDC drill bit (Po1ycrystallineDiamondCompact, 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.
For the drilling fluid NMR logging technique that oil content of drilling fluid amount detects in prior art, be intended to find the indiscoverable weak oil/gas show of means such as landwaste, gas survey, still not used for the precedent sentenced knowledge and evaluate of oil sources.
Therefore, current Problems existing is that operation is simple and feasible for needs research and development one, and accurately can sentence the method known and bore chance oil reservoir under having drilling fluid to add oily existence condition.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of under having drilling fluid to add oily existence condition, sentences the method known and bore and meet oil reservoir.The method utilizes the in-place oil of drilling fluid nuclear magnetic resonance technique to be mixed into interpolation oil, intrusion pit shaft to carry out analyzing with brill, can grasp the situation of change of oil content of drilling fluid rate and oil in time, help avoid the impact adding oil, find new oil show.Instant invention overcomes conventional method and be difficult to quantitative defect, method is more easy, reliable, and easily operates.
For achieving the above object, the invention provides a kind of for sentencing the method known and bore and meet oil reservoir under add oily existence condition at drilling fluid, comprising:
Steps A, takes the pure drilling fluid sample not attaching oiling and carries out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, and the T2 spectrum after drawing standard and T2 cumulative spectra, determine the position at pure drilling fluid peak;
Step B, take the drilling fluid sample being added with interpolation oil and carry out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, T2 spectrum after drawing standard and T2 cumulative spectra, distinguish drilling fluid peak and the oily peak of interpolation in the T2 spectrum after standardization, record the area A 1o at oily peak and the gross area A1 at all peaks, calculate the T2 geometric average T2g at oily peak and the oil content C1 containing the oily drilling fluid of interpolation;
Step C, when cannot distinguishing drilling fluid peak in stepb and adding oily peak, then needs to add relaxation reagent in the pure drilling fluid sample of steps A and the drilling fluid sample containing interpolation oil of step B, and repeats steps A and step B;
Step D, repetition step B and/or step C, and carry out analyzing continuously with brill nuclear magnetic resonance to containing adding oily drilling fluid and adding the oily drilling fluid of interpolation that contains after relaxation reagent at a certain distance;
Whether step e, bore chance oil reservoir by sentencing knowledge with the adjacent degree of depth of brill comparative analysis containing the interpolation oil content of oily drilling fluid and the change of oiliness.
In the present invention, alleged term " oil content of drilling fluid " refers to the oil of contained oil in drilling fluid, comprises density and/or the viscosity of oil.
In one embodiment of the invention, when comparative analysis show that the adjacent degree of depth there occurs change containing the oil content and/or oiliness adding oily drilling fluid in step e, be then judged to bore and meet oil reservoir.
According to the inventive method, the adjacent degree of depth described in step e is to be composed containing the standardization T2 adding oily drilling fluid by the adjacent degree of depth of comparative analysis and the oil difference of peak-to-peak signal amplitude of T2 cumulative spectra carries out qualitatively sentencing knowledge containing adding the change of oily oil content of drilling fluid rate.The described adjacent degree of depth is to be composed containing the standardization T2 adding oily drilling fluid by the adjacent degree of depth of comparative analysis and the oil difference of peak-to-peak position of T2 cumulative spectra carries out qualitatively sentencing knowledge containing adding the change of oily oil content of drilling fluid.
According in an embodiment of the inventive method, the described adjacent degree of depth is adopt the adjacent degree of depth containing the oil content C1 quantificational expression adding oily drilling fluid containing the change adding oily oil content of drilling fluid rate.The described adjacent degree of depth is composed containing the standardization T2 adding oily drilling fluid and T2 cumulative spectra oils, and the difference of peak-to-peak position is its T2 geometric average T2g quantificational expression of employing.
Described T2 geometric average T2g calculates according to the following formula:
T2g is T2 geometric average;
φ
cnfor nuclear magnetic resonance accumulation degree of porosity.
According to the inventive method, described method is also included in step e and is judged to bore and meets after oil reservoir, by carrying out quantitative assessment with the adjacent degree of depth of brill comparative analysis invade the in-place oil content of pit shaft and the step F of oil property containing adding the oil content of oily drilling fluid and the change of oiliness.
According in an embodiment of the inventive method, step F is by with boring the comparative analysis adjacent degree of depth containing the oil content C1 adding oily drilling fluid, and the T2 geometric average T2g at its standardization T2 composes and T2 cumulative spectra oils peak comes formation oil content and the oil property of quantitative assessment intrusion pit shaft.
According to the present invention, calculate according to the following formula containing the oil content C1 adding oily drilling fluid described in step B:
C1＝(A1o×100/A1)％。
In one embodiment of the invention, the nominal sample amount in steps A, step B is W, and its scope is 2 ~ 12g.The actual sampling amount of sample described in steps A is W0.The actual sampling amount of sample described in step B is W1.Standardization described in steps A is for carrying out standardization with W/W0 to T2 spectrum.Standardization described in step B is for carrying out standardization with W/W1 to T2 spectrum.
Add oil described in step B and comprise white oil, diesel oil, crude oil etc.
In one embodiment of the invention, the concentration of relaxation reagent described in step C in pure drilling fluid sample or the drilling fluid sample oily containing interpolation is at more than 10000ppm.
According to the inventive method, the 1 ~ 2m of spacing range described in step D.Spacing described in the present invention, in actual mechanical process, can perform by user or geological design requirement, such as, and 2m point, interval of interest 1 meter of 1 point.
In a specific embodiment of the present invention, take the pure drilling fluid sample not attaching oiling and carry out nuclear magnetic resonance spectroscopy, draw T2 spectrum and T2 cumulative spectra, determine the position at pure drilling fluid peak, the results are shown in Figure 1; Take the drilling fluid sample being added with the same interpolation oil of different amount and carry out nuclear magnetic resonance spectroscopy, draw T2 spectrum and T2 cumulative spectra, the results are shown in Figure 1 and Fig. 2.
In FIG, pass through the drawn pure drilling fluid T2 not attaching oiling and compose and T2 cumulative spectra, the position at drilling fluid peak is defined as the peak that the T2 relaxation time is less than 2ms; As can be seen from Fig. 1 and Fig. 2, different oil content has notable difference in T2 spectrum and T2 cumulative spectra, and Main Differences is embodied in signal amplitude.It can also be seen that from Fig. 1 and Fig. 2, because drilling fluid sample amount is at every turn different, so the peak of drilling fluid does not overlap, for the ease of contrast, must standardization be carried out.
In another specific embodiment of the present invention, take the pure drilling fluid sample not attaching oiling and carry out nuclear magnetic resonance spectroscopy, draw T2 spectrum and T2 cumulative spectra, determine the position at drilling fluid peak, the results are shown in Figure 3; Take the drilling fluid sample being added with different densities crude oil and carry out nuclear magnetic resonance spectroscopy, draw T2 spectrum and T2 cumulative spectra, calculate the T2 geometric average T2g at oily peak, the results are shown in Figure 3 and Fig. 4.
In figure 3, pass through the drawn pure drilling fluid T2 not attaching oiling and compose and T2 cumulative spectra, the position at drilling fluid peak is defined as the peak that the T2 relaxation time is less than 2ms; As can be seen from Fig. 3 and Fig. 4, the crude oil of different densities has notable difference in T2 spectrum and T2 cumulative spectra, and Main Differences is embodied in (with T2 geometric average quantificational expression) on the position at peak.It can also be seen that from Fig. 3 and Fig. 4, because drilling fluid sample amount is at every turn different, so the peak of drilling fluid does not overlap, for the ease of contrast, also must carry out standardization.
As can be seen from the above analysis, when at a certain distance to containing add oily drilling fluid and add after relaxation reagent containing add oily drilling fluid carry out analyzing continuously with brill nuclear magnetic resonance time, along with containing adding the circulation of oily drilling fluid, C1 can reduce gradually; When boring chance oil reservoir, can change containing the oil content and/or oiliness that add oily drilling fluid, being embodied in the adjacent degree of depth oils in the difference of peak-to-peak signal amplitude and oily peak-to-peak position containing the standardization T2 spectrum and T2 cumulative spectra of adding oily drilling fluid, such as, if formation oil and the oil of adding oil have difference, then there will be new peak or peak position changes.
In addition, due to C1 can be adopted represent containing the oil content adding oily drilling fluid, oil peak-to-peak position can adopt oily peak T2 geometric average T2g to represent, therefore, can also carry out quantificational expression containing the interpolation oil content of oily drilling fluid and the change of oiliness by the difference of C1 and oily peak T2 geometric average T2g.
The present invention take drilling fluid as analytic target, carry out analyzing with brill to the in-place oil of be mixed into interpolation oil, intrusion, the situation of change of oil content of drilling fluid rate and oil can be grasped in time, help avoid the impact adding oil, find new oil show, the speed per hour timeliness for the weak oil/gas show discovery rate of raising, raising drilling well is significant.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 not containing the T2 spectrum containing the oily drilling fluid of interpolation of the drilling fluid and different oil content that add oil.
Fig. 2 is the T2 cumulative spectra containing the oily drilling fluid of interpolation of different oil content.
Fig. 3 is not containing the T2 spectrum of adding the drilling fluid of oil and the drilling fluid containing different densities crude oil.
Fig. 4 is the T2 cumulative spectra of the drilling fluid containing different densities crude oil.
Fig. 5 is not containing the T2 spectrum containing the oily drilling fluid of interpolation of the drilling fluid and different depth that add oil in embodiment 1.
Fig. 6 is the T2 cumulative spectra containing the oily drilling fluid of interpolation of different depth in embodiment 1.
Detailed description of the invention
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:
Take the pure drilling fluid sample not attaching oiling and carry out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, the T2 spectrum after drawing standard and T2 cumulative spectra, determine the position at drilling fluid peak, the results are shown in Figure 5.In Figure 5, pass through drawn not attach the T2 spectrum after the standardization of the pure drilling fluid of oiling and T2 cumulative spectra, the position at drilling fluid peak is defined as the peak that the T2 relaxation time is less than 2ms.
In the work progress of certain well, in pure drilling fluid, be mixed into 8t white oil in well depth 2695m place as interpolation oil.Carry out nuclear magnetic resonance spectroscopy at 2697m to containing adding oily drilling fluid, the results are shown in Figure 5 and Fig. 6, as can be seen from Fig. 5 and Fig. 6, occurred oily peak on the right side at drilling fluid peak, relative oil content is 4.21%.
Continuous kernel magnetic resonance analysis is carried out subsequently to containing adding oily drilling fluid, the results are shown in Figure 5 and Fig. 6, as can be seen from Fig. 5 and Fig. 6, significant change is there occurs containing the oiliness of adding oily drilling fluid to during 2850m, oil becomes heavy relatively, T2g reduces to 46 by 64, and oil content is also reduced to 2.97%, illustrates that a set of new oil reservoir met by brill; After being drilled into 3307m, oil changes again, and T2g reduces to 42 by 46, and oil content is about 1.85%.Can the change of oiliness as apparent from T2 Differential Spectrum and T2 cumulative spectra, what thus achieve under drilling fluid adds oily existence condition formation crude oil quantitatively sentences knowledge and accurate evaluation.
In addition, as can be seen from Fig. 5 and Fig. 6, owing to having carried out standardization to T2 spectrum and T2 cumulative spectra, what obviously find out 2697m and the 2700m degree of depth has been one group; The 2850m degree of depth be one group; 3307,3312,3347 and the 3365m degree of depth be another group.
Claims (8)
1. for add oily existence condition at drilling fluid under, sentence the method known and bore and meet oil reservoir, comprising:
Steps A, takes the pure drilling fluid sample not attaching oiling and carries out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, and the T2 spectrum after drawing standard and T2 cumulative spectra, determine the position at pure drilling fluid peak;
Step B, take the drilling fluid sample being added with interpolation oil and carry out nuclear magnetic resonance spectroscopy, column criterion of going forward side by side process, T2 spectrum after drawing standard and T2 cumulative spectra, distinguish drilling fluid peak and the oily peak of interpolation in the T2 spectrum after standardization, record the area A 1o at oily peak and the gross area A1 at all peaks, calculate the T2 geometric average T2g at oily peak and the oil content C1 containing the oily drilling fluid of interpolation;
Step C, when cannot distinguishing drilling fluid peak in stepb and adding oily peak, then needs to add relaxation reagent in the pure drilling fluid sample of steps A and the drilling fluid sample containing interpolation oil of step B, and repeats steps A and step B;
Step D, repetition step B and/or step C, and carry out analyzing continuously with brill nuclear magnetic resonance to containing adding oily drilling fluid and adding the oily drilling fluid of interpolation that contains after relaxation reagent at a certain distance;
Whether step e, bore chance oil reservoir by sentencing knowledge with the adjacent degree of depth of brill comparative analysis containing the interpolation oil content of oily drilling fluid and the change of oiliness;
When comparative analysis show that the adjacent degree of depth there occurs change containing the oil content and/or oiliness adding oily drilling fluid in step e, be then judged to bore and meet oil reservoir;
The adjacent degree of depth described in step e is to be composed containing the standardization T2 adding oily drilling fluid by the adjacent degree of depth of comparative analysis and the oil difference of peak-to-peak signal amplitude of T2 cumulative spectra carries out qualitatively sentencing knowledge containing adding the change of oily oil content of drilling fluid rate;
The described adjacent degree of depth is to be composed containing the standardization T2 adding oily drilling fluid by the adjacent degree of depth of comparative analysis and the oil difference of peak-to-peak position of T2 cumulative spectra carries out qualitatively sentencing knowledge containing adding the change of oily oil content of drilling fluid.
2. method according to claim 1, is characterized in that:
The described adjacent degree of depth is adopt the adjacent degree of depth to contain the oil content C1 quantificational expression adding oily drilling fluid containing the change adding oily oil content of drilling fluid rate;
The described adjacent degree of depth is composed containing the standardization T2 adding oily drilling fluid and T2 cumulative spectra oils, and the difference of peak-to-peak position is its T2 geometric average T2g quantificational expression of employing.
3. method according to claim 1, it is characterized in that: described method is also included in step e and is judged to bore and meets after oil reservoir, by carrying out quantitative assessment with the adjacent degree of depth of brill comparative analysis invade the in-place oil content of pit shaft and the step F of oil property containing adding the oil content of oily drilling fluid and the change of oiliness.
4. method according to claim 3, it is characterized in that: step F is by with boring the comparative analysis adjacent degree of depth containing the oil content C1 adding oily drilling fluid, and the T2 geometric average T2g at its standardization T2 composes and T2 cumulative spectra oils peak comes formation oil content and the oil property of quantitative assessment intrusion pit shaft.
5. method according to claim 1, is characterized in that: calculate according to the following formula containing the oil content C1 adding oily drilling fluid described in step B:
C1＝(A1o×100/A1)％。
6. method according to claim 1, is characterized in that:
Nominal sample amount in steps A, step B is W, and its scope is 2 ~ 12g;
The actual sampling amount of sample described in steps A is W0;
The actual sampling amount of sample described in step B is W1;
Standardization described in steps A is for carrying out standardization with W/W0 to T2 spectrum;
Standardization described in step B is for carrying out standardization with W/W1 to T2 spectrum.
7. method according to claim 1, is characterized in that: the concentration of relaxation reagent described in step C in pure drilling fluid sample or the drilling fluid sample oily containing interpolation is at more than 10000ppm.
8. method according to claim 1, is characterized in that: the 1 ~ 2m of spacing range described in step D.
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| CN107304674B (en) * | 2016-04-20 | 2021-04-02 | 中石化石油工程技术服务有限公司 | Logging method for evaluating oil content of reservoir by using nuclear magnetic resonance of drilling fluid |
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| 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 |
| CN110044946B (en) * | 2019-05-22 | 2022-04-15 | 张善文 | Method for measuring oil content of carbon black by low-field nuclear magnetic resonance |
| CN111411944B (en) * | 2020-04-27 | 2024-04-09 | 国仪石油技术(无锡)有限公司 | Nuclear magnetic resonance logging while drilling instrument and working mode control method and system thereof |
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