CN103362505A - Method for judging and identifying drilling-encounter oil layer under condition that drilling fluid adding oil exists - Google Patents
Method for judging and identifying drilling-encounter oil layer under condition that drilling fluid adding oil exists Download PDFInfo
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- CN103362505A CN103362505A CN2012101042286A CN201210104228A CN103362505A CN 103362505 A CN103362505 A CN 103362505A CN 2012101042286 A CN2012101042286 A CN 2012101042286A CN 201210104228 A CN201210104228 A CN 201210104228A CN 103362505 A CN103362505 A CN 103362505A
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Abstract
The invention relates to a method for judging and identifying a drilling-encounter oil layer under a condition that drilling fluid adding oil exists. According to the method, drilling fluid serves as an analysis object; a nuclear magnetic resonance technique which is sensitive to oil quality and high in linearity degree serves as a means; under the condition that the drilling fluid adding oil exists, the drilling-encounter oil layer can be judged and identified qualitatively by comparing a standard T2 spectrum with a T2 cumulative spectrum; the content and a property of in-place crude oil invaded into a shaft can be quantitatively evaluated by comparing an oil peak T2g with an oil containing rate of the drilling fluid; and the method overcomes the defects that the conventional method is difficult in quantification and is helpless to the fact that homologous crude oil is mixed, and is simpler, more convenient, more reliable, and easy to operate.
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 having drilling fluid to add to declare under the oily existence condition method of meeting oil reservoir of boring of knowing.
Background technology
At present, there is being drilling fluid to add under the condition of oil existence, distinguish drilling fluid and add oil and in-place oil, declare the method for knowing brill chance oil reservoir two classes are arranged: a class is based on the gas of drilling fluid and surveys method, detect online total hydrocarbon and the C1～C5 composition that drilling fluid is deviate from gas by gas-chromatography, declare knowledge gas by curvilinear characteristic and component characteristics and survey to show it is from adding oil or in-place oil, this method is a kind of qualitatively method, be difficult to quantitatively, although the instrument producer that has has researched and developed the difference chromatogram, but owing to be subjected to temperature and pressure in the circulation of drilling fluid process, the impact of the many conditions in stratum is difficult to prove effective, and is helpless especially when sneaking into the in-place oil of homology.The another kind of oil gas analyzing method that is based on landwaste is distinguished the hydrocarbon composition that adds oil and in-place oil by methods such as quantitative fluorescence, head space gas lighter hydrocarbons chromatogram, thermal evaporation hydrocarbon chromatogram, rock pyrolysis chromatograms.This method needs first various interpolation oil to be analyzed the Criterion collection of illustrative plates; In drilling process, the analysis of spectra of landwaste is compared with it, if similar then for adding the demonstration of oil, otherwise be the true demonstration from the stratum, the method also is helpless to the in-place oil of sneaking into homology, and there are two large deficiencies: the one, after interpolation oil adds drilling fluid, to circulate to the earth's surface again from the earth's surface to underground with it, therebetween will through the impact of shaft bottom HTHP, will be through the impact of washing away, will stand to have drilled oil reservoir of the long distance of pit shaft, many variations have occured in its composition, so bad differentiation more is difficult to quantitatively; The 2nd, along with PDC drill bit (Po1ycrystalline Diamond Compact, being widely used polycrystalline diamond compact bit), it is Powdered that landwaste is, surface area is large, washed away seriously by drilling fluid, the oil bearing grade meeting decrease of oil reservoir landwaste, therefore the recognition methods based on landwaste has lost basic condition.
Be used for the drilling fluid NMR logging technique that the oil content of drilling fluid amount detects in the prior art, be intended to find the indiscoverable weak oil/gas show of the means such as landwaste, gas survey, still be not used for declaring of oil sources and know and the precedent of estimating.
Therefore, the problem that exists at present is to need research and development a kind of operation is simple and feasible, and can accurately declare the method for meeting oil reservoir of boring of knowing under the oily existence condition there being drilling fluid to add.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and providing a kind of is having drilling fluid to add to declare under the oily existence condition method of meeting oil reservoir of boring of knowing.The method utilizes the drilling fluid nuclear magnetic resonance technique that the interpolation oil of sneaking into, the in-place oil of invading pit shaft are carried out analyzing with boring, and can in time grasp the situation of change of oil content of drilling fluid rate and oil, helps avoid the impact of adding oil, finds new oil show.The present invention has overcome conventional method and has been difficult to quantitative defective, and method is more easy, reliable, and easily operation.
For achieving the above object, the invention provides and a kind ofly declare the method for know to bore meeting oil reservoir under the oily existence condition for adding at drilling fluid, comprising:
Steps A takes by weighing the pure drilling fluid sample that does not attach oiling and carries out nuclear magnetic resonance spectroscopy, the column criterion of going forward side by side processing, and the T2 after the drawing standard composes and the T2 cumulative spectra, determines the position at pure drilling fluid peak;
Step B, take by weighing the drilling fluid sample that is added with interpolation oil and carry out nuclear magnetic resonance spectroscopy, the column criterion of going forward side by side processing, T2 spectrum and T2 cumulative spectra after the drawing standard, drilling fluid peak and the oily peak of interpolation on the T2 spectrum after the differentiation 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 contain the oil content C1 that adds oily drilling fluid;
Step C when distinguishing the drilling fluid peak and add oily peak in step B, then needs to add relaxation reagent to pure drilling fluid sample and the containing in the drilling fluid sample that adds oil of step B of steps A, and repeats steps A and step B;
Step D, repeating step B and/or step C, and at a certain distance the oily drilling fluid of interpolation that contains that contains after adding oily drilling fluid and adding relaxation reagent is carried out analyzing continuously with boring nuclear magnetic resonance;
Whether step e bores the chance oil reservoir by declaring knowledge with the variation of boring the adjacent degree of depth of comparative analysis and contain the oil content that adds oily drilling fluid and oiliness.
Alleged term " oil content of drilling fluid " refers to the oil of institute's oil-containing in the drilling fluid among the present invention, comprises density and/or the viscosity of oil.
In one embodiment of the invention, contain oil content and/or the oiliness of adding oily drilling fluid variation has occured when comparative analysis draws the adjacent degree of depth in the step e, then be judged to be and bore the chance oil reservoir.
According to the inventive method, it is to contain the oil difference of peak-to-peak signal amplitude of the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra by the adjacent degree of depth of comparative analysis to carry out the qualitative knowledge of declaring that the adjacent degree of depth described in the step e contains the variation of adding oily oil content of drilling fluid rate.It is to contain the oil difference of peak-to-peak position of the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra by the adjacent degree of depth of comparative analysis to carry out the qualitative knowledge of declaring that the described adjacent degree of depth contains the variation of adding oily oil content of drilling fluid.
In an embodiment according to the inventive method, it is the oil content C1 quantificational expression that adopts the adjacent degree of depth to contain to add oily drilling fluid that the described adjacent degree of depth contains the variation of adding oily oil content of drilling fluid rate.It is its T2 geometric average of employing T2g quantificational expression that the described adjacent degree of depth contains the oil difference of peak-to-peak position of the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra.
Described T2 geometric average T2g calculates according to following formula:
T2g is the T2 geometric average;
φ
CnBe nuclear magnetic resonance accumulation degree of porosity.
According to the inventive method, described method also is included in step e and is judged to be and bore meets after the oil reservoir, by the adjacent degree of depth of comparative analysis contains the oil content that adds oily drilling fluid and the variation of oiliness comes the in-place oil content of quantitative assessment intrusion pit shaft and the step F of oil property with boring.
In an embodiment according to the inventive method, step F is by containing the oil content C1 that adds oily drilling fluid with boring the adjacent degree of depth of comparative analysis, with and the oil T2 geometric average T2g at peak of standardization T2 spectrum and T2 cumulative spectra come formation oil content and the oil property of quantitative assessment intrusion pit shaft.
According to the present invention, contain the oil content C1 that adds oily drilling fluid described in the step B and calculate according to following formula:
C1＝(A1o×100/A1)％。
In one embodiment of the invention, the specified sampling amount among steps A, the step B is W, and its scope is 2～12g.The actual sampling amount of sample described in the steps A is W0.The actual sampling amount of sample described in the step B is W1.Standardization described in the steps A is for carrying out standardization with W/W0 to the T2 spectrum.Standardization described in the step B is for carrying out standardization with W/W1 to the T2 spectrum.
Add oil described in the step B and comprise white oil, diesel oil, former wet goods.
In one embodiment of the invention, relaxation reagent described in the step C is at pure drilling fluid sample or contain concentration in the drilling fluid sample that adds oil more than 10000ppm.
According to the inventive method, the 1～2m of spacing range described in the step D.Spacing described in the present invention in the actual mechanical process, can be carried out by user or geological design requirement, for example, and point of 2m, 1 meter 1 point of interval of interest.
In a specific embodiment of the present invention, take by weighing the pure drilling fluid sample that does not attach 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 by weighing and be added with the same drilling fluid samples that add oil of different amounts 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. 1, the pure drilling fluid T2 spectrum and the T2 cumulative spectra that do not attach oiling that pass through to draw are that the T2 relaxation time is less than the peak of 2ms with the location positioning at drilling fluid peak; Can find out that from Fig. 1 and Fig. 2 different oil contents have notable difference in T2 spectrum and T2 cumulative spectra, Main Differences is embodied on the signal amplitude.It can also be seen that from Fig. 1 and Fig. 2, because the drilling fluid sample size of each usefulness is different, so the peak of drilling fluid does not overlap, for the ease of contrast, must carry out standardization.
In another specific embodiment of the present invention, take by weighing the pure drilling fluid sample that does not attach 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 by weighing the drilling fluid sample that is 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 Fig. 3, the pure drilling fluid T2 spectrum and the T2 cumulative spectra that do not attach oiling that pass through to draw are that the T2 relaxation time is less than the peak of 2ms with the location positioning at drilling fluid peak; Can find out that from Fig. 3 and Fig. 4 the crude oil of different densities has notable difference in T2 spectrum and T2 cumulative spectra, Main Differences is embodied on the position at peak (usefulness T2 geometric average quantificational expression).It can also be seen that from Fig. 3 and Fig. 4, because the drilling fluid sample size of each usefulness is 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 adding oily drilling fluid containing after adding oily drilling fluid and adding relaxation reagent and carry out when boring nuclear magnetic resonance and analyze continuously containing at a certain distance, along with containing the circulation of adding oily drilling fluid, C1 can reduce gradually; When boring the chance oil reservoir, containing oil content and/or the oiliness of adding oily drilling fluid can change, being embodied in the adjacent degree of depth contains the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra and oils on the difference of peak-to-peak signal amplitude and oily peak-to-peak position, for example, if the oil of formation oil and interpolation oil has difference, new peak or peak position then can occur and change.
In addition, because containing the oil content that adds oily drilling fluid can adopt C1 to represent, oil peak-to-peak position can adopt oily peak T2 geometric average T2g to represent, therefore, containing the oil content that adds oily drilling fluid and the variation of oiliness can also come quantificational expression by the difference of C1 and oily peak T2 geometric average T2g.
The present invention is take drilling fluid as analytic target, the interpolation oil of sneaking into, the in-place oil of invading are carried out analyzing with boring, can in time grasp the situation of change of oil content of drilling fluid rate and oil, help avoid the impact of adding oil, find new oil show, significant for the speed per hour timeliness that improves weak oil/gas show discovery rate, raising drilling well.The present invention has overcome conventional method and has been difficult to quantitative defective, and method is more easy, reliable, and easily operation.
Description of drawings
Come the present invention is described in further detail below in conjunction with accompanying drawing:
Fig. 1 does not contain to add the T2 spectrum of adding oily drilling fluid containing of oily drilling fluid and different oil content.
Fig. 2 is the T2 cumulative spectra that adds oily drilling fluid containing of different oil content.
Fig. 3 is the T2 spectrum that does not contain the drilling fluid that adds oil and contain the drilling fluid of different densities crude oil.
Fig. 4 is the T2 cumulative spectra that contains the drilling fluid of different densities crude oil.
Fig. 5 does not contain among the embodiment 1 to add the T2 spectrum of adding oily drilling fluid containing of oily drilling fluid and different depth.
Fig. 6 be among the embodiment 1 different depth contain the T2 cumulative spectra that adds oily drilling fluid.
The specific embodiment
Describe the present invention in detail below in conjunction with embodiment and accompanying drawing, these embodiment and accompanying drawing only play the illustrative effect, are not limited to range of application of the present invention.
Embodiment
Embodiment 1:
Take by weighing the pure drilling fluid sample that does not attach oiling and carry out nuclear magnetic resonance spectroscopy, the column criterion of going forward side by side processing, the T2 after the drawing standard composes and the T2 cumulative spectra, determines the position at drilling fluid peak, the results are shown in Figure 5.In Fig. 5, T2 after the standardization of the pure drilling fluid that does not attach oiling that passes through to draw spectrum and T2 cumulative spectra are that the T2 relaxation time is less than the peak of 2ms with the location positioning at drilling fluid peak.
In the work progress of certain well, sneaked into the 8t white oil in well depth 2695m place to pure drilling fluid as adding oil.Add oily drilling fluid and carry out nuclear magnetic resonance spectroscopy containing at 2697m, the results are shown in Figure 5 and Fig. 6, can find out that from Fig. 5 and Fig. 6 oily peak occurred on the right side at drilling fluid peak, oil content is 4.21% relatively.
Carry out the continuous kernel magnetic resonance analysis to containing the oily drilling fluid of interpolation subsequently, the results are shown in Figure 5 and Fig. 6, can find out from Fig. 5 and Fig. 6, contain the oiliness of adding oily drilling fluid during to 2850m significant change has occured, it is heavy that oil becomes relatively, T2g reduces to 46 by 64, and oil content also is reduced to 2.97%, illustrates to bore to have met the new oil reservoir of a cover; Be drilled into after the 3307m, oil changes again, and T2g reduces to 42 by 46, and oil content is about 1.85%.Can obviously find out the variation of oiliness from T2 Differential Spectrum and T2 cumulative spectra, realize thus adding under the oily existence condition at drilling fluid quantitatively declaring of in-place oil known and accurate evaluation.
In addition, can find out from Fig. 5 and Fig. 6 that because T2 spectrum and T2 cumulative spectra have been carried out standardization, what obviously find out 2697m and the 2700m degree of depth is one group; The 2850m degree of depth be one group; 3307,3312,3347 and the 3365m degree of depth be another group.
Claims (10)
1. one kind is used for adding the method for declaring knowledge brill chance oil reservoir under the oily existence condition at drilling fluid, comprising:
Steps A takes by weighing the pure drilling fluid sample that does not attach oiling and carries out nuclear magnetic resonance spectroscopy, the column criterion of going forward side by side processing, and the T2 after the drawing standard composes and the T2 cumulative spectra, determines the position at pure drilling fluid peak;
Step B, take by weighing the drilling fluid sample that is added with interpolation oil and carry out nuclear magnetic resonance spectroscopy, the column criterion of going forward side by side processing, T2 spectrum and T2 cumulative spectra after the drawing standard, drilling fluid peak and the oily peak of interpolation on the T2 spectrum after the differentiation 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 contain the oil content C1 that adds oily drilling fluid;
Step C when distinguishing the drilling fluid peak and add oily peak in step B, then needs to add relaxation reagent to pure drilling fluid sample and the containing in the drilling fluid sample that adds oil of step B of steps A, and repeats steps A and step B;
Step D, repeating step B and/or step C, and at a certain distance the oily drilling fluid of interpolation that contains that contains after adding oily drilling fluid and adding relaxation reagent is carried out analyzing continuously with boring nuclear magnetic resonance;
Whether step e bores the chance oil reservoir by declaring knowledge with the variation of boring the adjacent degree of depth of comparative analysis and contain the oil content that adds oily drilling fluid and oiliness.
2. method according to claim 1 is characterized in that: contain oil content and/or the oiliness of adding oily drilling fluid variation has occured when comparative analysis draws the adjacent degree of depth in the step e, then be judged to be and bore the chance oil reservoir.
3. method according to claim 2 is characterized in that:
It is to contain the oil difference of peak-to-peak signal amplitude of the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra by the adjacent degree of depth of comparative analysis to carry out the qualitative knowledge of declaring that the adjacent degree of depth described in the step e contains the variation of adding oily oil content of drilling fluid rate;
It is to contain the oil difference of peak-to-peak position of the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra by the adjacent degree of depth of comparative analysis to carry out the qualitative knowledge of declaring that the described adjacent degree of depth contains the variation of adding oily oil content of drilling fluid.
4. method according to claim 3 is characterized in that:
It is the oil content C1 quantificational expression that adopts the adjacent degree of depth to contain to add oily drilling fluid that the described adjacent degree of depth contains the variation of adding oily oil content of drilling fluid rate;
It is its T2 geometric average of employing T2g quantificational expression that the described adjacent degree of depth contains the oil difference of peak-to-peak position of the standardization T2 spectrum of adding oily drilling fluid and T2 cumulative spectra.
5. method according to claim 1, it is characterized in that: described method also is included in step e and is judged to be and bore meets after the oil reservoir, by the adjacent degree of depth of comparative analysis contains the oil content that adds oily drilling fluid and the variation of oiliness comes the in-place oil content of quantitative assessment intrusion pit shaft and the step F of oil property with boring.
6. method according to claim 5, it is characterized in that: step F is by containing the oil content C1 that adds oily drilling fluid with boring the adjacent degree of depth of comparative analysis, with and the oil T2 geometric average T2g at peak of standardization T2 spectrum and T2 cumulative spectra come formation oil content and the oil property of quantitative assessment intrusion pit shaft.
7. method according to claim 1 is characterized in that: contain the oil content C1 that adds oily drilling fluid described in the step B and calculate according to following formula:
C1＝(A1o×100/A1)％。
8. method according to claim 1 is characterized in that:
Specified sampling amount among steps A, the step B is W, and its scope is 2～12g;
The actual sampling amount of sample described in the steps A is W0;
The actual sampling amount of sample described in the step B is W1;
Standardization described in the steps A is for carrying out standardization with W/W0 to the T2 spectrum;
Standardization described in the step B is for carrying out standardization with W/W1 to the T2 spectrum.
9. method according to claim 1 is characterized in that: relaxation reagent described in the step C is at pure drilling fluid sample or contain concentration in the drilling fluid sample that adds oil more than 10000ppm.
10. method according to claim 1 is characterized in that: the 1～2m of spacing range described in the step D.
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| CN111411944A (en) * | 2020-04-27 | 2020-07-14 | 无锡量子感知研究所 | Nuclear magnetic resonance logging while drilling instrument and working mode control method and system thereof |
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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 |
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| CN107304674A (en) * | 2016-04-20 | 2017-10-31 | 中石化石油工程技术服务有限公司 | A kind of utilization drilling well fluid nuclear magnetic resonance evaluates the logging method of reservoir oiliness |
| 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 |
| CN109386282A (en) * | 2017-08-09 | 2019-02-26 | 中国石油化工股份有限公司 | Bored under the conditions of a kind of oil emulsion drilling fluid meet oil reservoir sentence knowledge method |
| CN111380891A (en) * | 2018-12-29 | 2020-07-07 | 中国石油化工股份有限公司 | Method for constructing drilling fluid stratum oil identification chart and method for identifying oil layer in drilling |
| CN110044946A (en) * | 2019-05-22 | 2019-07-23 | 张善文 | A kind of method of low-field nuclear magnetic resonance measurement carbon black oil content |
| CN111411944A (en) * | 2020-04-27 | 2020-07-14 | 无锡量子感知研究所 | Nuclear magnetic resonance logging while drilling instrument and working mode control method and system thereof |
| 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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