CN109709130B - Method for testing oil content of stratum of full-oil-based drilling fluid - Google Patents
Method for testing oil content of stratum of full-oil-based drilling fluid Download PDFInfo
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Abstract
The invention discloses a method for testing the oil content of a stratum of a full oil-based drilling fluid. The method adopts a nuclear magnetic resonance analysis instrument, and uses the difference of nuclear magnetic resonance signals of unit mass of the base fluid of the full oil-based drilling fluid and the formation crude oil, and uses the correlation analysis of the signal intensity of the base fluid in the full oil-based drilling fluid, the quality of the base fluid and the signal intensity of the formation oil and the quality of the formation oil as main means to test the formation oil content of the full oil-based drilling fluid. The method can quickly and accurately test the stratum oil content of the full oil-based drilling fluid, can analyze the full oil-based drilling fluid in the drilling process on the drilling fluid site in time, obtains the oil content information of the drilling fluid, and provides technical support for well logging interpretation of petroleum exploration and development in time. The method has the advantages of high accuracy of the measurement result, good stability, short time consumption and the like, is easy to realize the measurement of the oil content of the full oil-based drilling fluid, and provides a basis for the identification and evaluation of an oil-containing layer.
Description
Technical Field
The invention relates to a method for testing the oil content of a stratum of a full oil-based drilling fluid, and belongs to the field of nuclear magnetic resonance drilling fluid analysis.
Background
When the formation is drilled, some of the fluid in the pores remains in the rock sample and another portion enters the drilling fluid. The adsorbed gas, the dissolved gas and the free gas in the drilling fluid and the adsorbed oil and the adsorbed gas in the rock sample are detected by corresponding logging means, but the oil in the drilling fluid is a blank in logging detection. The application of PDC drill bits and rapid drilling processes results in fine cuttings, and the fine cuttings are beneficial to transferring oil, gas and water in solid rock samples into drilling fluid. The free gas in the drilling fluid can be detected by gas logging, but the oil content remained in the drilling fluid is not detected by a good method at present. The oil and gas entering the drilling fluid is mainly mobile fluid in the reservoir, and the oil and gas just reflects the capacity of the reservoir.
Patent application CN201410636058.5 discloses a method for identifying formation oil based on oil-based drilling fluid, but this patent is based on the fact that the relaxation times of oil and water in oil-based drilling fluid are completely separated, and the oil and water in actual oil-based drilling fluid may also have partial overlapping phenomenon, so the above method has limitations. The invention mainly aims to develop a method for testing the oil content of the full-oil-based drilling fluid with wider application range by utilizing a low-field nuclear magnetic resonance technology, and detect the change of formation oil in the full-oil-based drilling fluid, thereby evaluating the property of reservoir fluid and improving the accuracy of the fluid property identification of the logging technology.
Disclosure of Invention
The invention aims to: a method for testing the oil content of the stratum of the full oil-based drilling fluid by using a low-field nuclear magnetic resonance technology is provided. The method can be suitable for testing the oil content of the stratum in the full oil-based drilling fluid, and is high in testing accuracy, good in stability and short in time consumption.
The technical scheme of the invention is as follows: a method for testing the oil content of an all-oil-based drilling fluid by using a low-field nuclear magnetic resonance technology is used for testing the stratum oil content of the all-oil-based drilling fluid by taking the signal intensity and the base fluid quality of a base fluid in the all-oil-based drilling fluid and the correlation analysis of the signal intensity and the quality of stratum oil as main means. The technical core is as follows: the method comprises the steps of manufacturing a base fluid standard sample of the full oil-based drilling fluid, manufacturing a stratum oil content standard sample of the full oil-based drilling fluid, building a correlation model and calculating the oil content of the drilling fluid.
A method for testing the oil content of a full oil-based drilling fluid stratum is characterized by comprising the following steps:
(1) preparing base liquid standard sample of full-oil-based drilling fluid
Firstly, taking base fluid of the full-oil-based drilling fluid before taking down a well, and respectively adding base fluid with different masses into 7ml standard sample bottles;
(2) preparing oil content standard sample of full oil-based drilling fluid stratum
Selecting stratum crude oil with the same property as crude oil in the full-oil-based drilling fluid as a calibration sample, preparing full-oil-based drilling fluid base fluid with the same quality, and adding stratum crude oil with different qualities into the base fluid, thereby obtaining stratum oil content calibration samples of the full-oil-based drilling fluid with different qualities;
(3) correlation modeling analysis
Collecting CPMG nuclear magnetic resonance signals of all oil-based drilling fluid base fluid standard samples and CPMG nuclear magnetic resonance signals of all oil-based drilling fluid stratum oil content standard samples by using a CPMG sequence;
by utilizing the first 50 nuclear magnetic resonance signals of the CPMG, 50 unary linear regression equations S can be obtainedi base fluid=ki base fluidmBase liquid+bi base fluidFormula and 50 unary linear regression equations Sj crude oil=kj crude oilmCrude oil+bj crude oilThereby obtaining a series of Si base fluid、ki base fluid、bi base fluidAnd Sj crude oil、kj crude oil、bj crude oil；
(4) Calculating the oil content of the oil-based drilling fluid
Testing a sample to be tested to obtain a series of signals S, and performing partial least square fitting on the series of signals S of the sample to be tested and the unary linear regression equation of all the columns to calculate the optimal mBase liquidAnd mCrude oilAnd finally obtaining the stratum oil content of the full oil-based drilling fluid.
The base fluid of the full-oil-based drilling fluid is a stock fluid of the full-oil-based drilling fluid before downhole, and the mass range is 1-4 g; the number of the base liquid standard samples is 5-7.
The mass range of the base fluid of the full oil-based drilling fluid with the same mass is 2.5-3.5g, the mass range of the formation crude oil with the same property as that of the crude oil in the full oil-based drilling fluid is 0.003-0.5 g, and the formation oil content standards of the full oil-based drilling fluid with different masses are 5-7, and the samples are respectively placed in glass bottles with the capacity of 7ml for sealing.
The unary linear regression equation takes the mass of the base fluid as a horizontal coordinate and the nuclear magnetic resonance signal of the base fluid as a vertical coordinate for the base fluid of the all-oil-based drilling fluid to obtain the unary linear regression equation, uses 50 nuclear magnetic resonance signals of the base fluid to calculate 50 correlation equations according to the unary linear regression equation, and obtains the correlation coefficient of the linear correlation curve.
The unary linear regression equation takes the mass of the formation crude oil as a horizontal coordinate and the nuclear magnetic resonance signal of the formation crude oil as a vertical coordinate to obtain the unary linear regression equation, uses 50 nuclear magnetic resonance signals of the formation crude oil to calculate 50 correlation equations according to the unary linear regression equation, and obtains the correlation coefficient of the linear correlation curve.
The nuclear magnetic resonance signal of the formation crude oil is obtained by subtracting the nuclear magnetic resonance signal of the base fluid from the nuclear magnetic resonance signal of the oil content standard sample of the oil-based drilling fluid formation.
The technical characteristics which are not described in the invention are matched by adopting the mature prior art.
Compared with the prior art, the invention has the following advantages:
1. the method can ensure that the oil content of the full-oil-based drilling fluid sample can be rapidly and accurately tested, so that the oil content of the drilling fluid sample can be analyzed in time, the information of a complex stratum can be known, and the logging work can be effectively guided in real time.
2. The method has the advantages of high oil content testing speed and short time consumption on the whole oil-based drilling fluid sample, and the whole oil content testing can be completed within 12 minutes.
Drawings
FIG. 1 of oil-based drilling fluid base fluid, crude oil, oil-based drilling fluid base fluid, and crude oil blendT 2A relaxation time spectrum;
FIG. 2 the first 50 point signals of CPMG of base fluid and crude oil per unit mass;
FIG. 3 is a graph of the results of 50 working curves for base fluid and crude oil for drilling fluid # 1;
FIG. 4 shows the results of sampling signals and calculating fitting signals for drilling fluid No. 1;
Detailed Description
The method is described in further detail below with reference to the figures and specific examples.
Example 1:
the process of the invention is described below with reference to the accompanying drawings and specific examples:
first, test purpose
Determining the influence of the base fluid in the full oil-based drilling fluid on the formation oil test, and testing the relaxation and signal characteristics of the base fluid of the full oil-based drilling fluid and the formation oil content of the full oil-based drilling fluid.
Second, test materials
A full oil-based drilling fluid base fluid, formation crude oil, a drilling fluid 1#, a 7ml glass bottle and a stirrer;
third, the experimental instrument
PQ001 Nymi analytical instrument manufactured by Nymi, Suzhou, Inc., resonance frequency of 18.179MHz, magnet strength of 0.45T, probe coil diameter of 25mm, and experiment temperature controlled at 31.99-32.01 deg.C;
fourth, preparation of test samples
Weighing 3.9g of base fluid, testing CPMG attenuation curve and inverting T2A relaxation spectrum;
weighing 0.2g of crude oil, testing CPMG attenuation curve and inverting T2A relaxation spectrum;
4g of drilling fluid No. 1 is weighed out to test the CPMG attenuation curve.
Fifth, test procedure
1. The influence of the base fluid on the relaxation time of the crude oil is tested, and can be known by combining the graph shown in figures 1 and 2:
(1) t of base fluid2The relaxation time is between 0.7 and 160 ms; t of crude oil to be measured2The relaxation time is between 0.3 and 110 ms; t of mixed solution of base liquid and crude oil to be tested2The relaxation time is between 0.9 and 310 ms; t of base liquid in mixed liquid2Relaxation time and T of crude oil measured2Relaxation times are mixed and cannot directly distinguish the signals of the measured crude oil;
(2) the signal of the base fluid with unit mass is different from the crude oil signal, so the invention can fully utilize the difference of the base fluid and the crude oil with unit mass to calculate the signal of the formation oil of the full oil-based drilling fluid, thereby quantitatively testing the formation oil content of the full oil-based drilling fluid.
2. Preparation of base liquid standard sample of full oil-based drilling fluid
The base fluid is prepared by using the stock solution of the full-oil-based drilling fluid before downhole in the embodiment as a raw material, and the specific information of the standard sample is shown in table 1:
table 1 base fluid standard information for oil-based drilling fluids
| Numbering | Base fluid mass/ |
| 1 | 1.1385 |
| 2 | 2.0029 |
| 3 | 2.5002 |
| 4 | 3.1126 |
| 5 | 3.9697 |
3. Preparation of oil content standard sample of full oil-based drilling fluid
TABLE 2 oil content of oil-based drilling fluids Standard information
| Numbering | Mass of crude oil in stratum per gram | Base fluid mass/ |
| 1 | 0.0080 | 2.7002 |
| 2 | 0.0495 | 2.6985 |
| 3 | 0.1761 | 2.7009 |
| 4 | 0.3507 | 2.7068 |
| 5 | 0.5000 | 2.6954 |
4. Correlation modeling analysis
(1) Firstly, performing CPMG nuclear magnetic resonance acquisition on a full-oil-based drilling fluid base fluid standard sample and a full-oil-based drilling fluid oil content standard sample by using the same sampling parameters;
(2) taking the mass of a base fluid standard sample of the oil-based drilling fluid as an abscissa and the nuclear magnetic resonance signals as an ordinate, obtaining a unary linear regression equation, and obtaining 50 correlation equations according to the unary linear regression equation by using 50 nuclear magnetic resonance signals of the base fluid, wherein the correlation of a linear correlation curve is more than 0.997;
(3) the method comprises the steps of taking the mass of formation crude oil in a standard sample of the oil content of the full oil-based drilling fluid as a horizontal coordinate and the nuclear magnetic resonance signals of the crude oil as a vertical coordinate to obtain a unary linear regression equation, solving 50 correlation equations according to the unary linear regression equation by using 50 nuclear magnetic resonance signals of the formation crude oil (subtracting the base fluid signals from the signals of the base fluid of the full oil-based drilling fluid and the mixed liquid of the crude oil), and enabling the correlation of a linear correlation curve to be larger than 0.997.
5. The oil content of the drilling fluid 1# is tested, and can be known by combining fig. 3 and fig. 4:
and (3) acquiring the CPMG nuclear magnetic resonance signals of the full-oil-based drilling fluid by using the same sampling parameters as the calibration sample, extracting the first 50 nuclear magnetic resonance signals of the CPMG nuclear magnetic resonance signals and a working curve to perform partial least square fitting, further obtaining the base fluid quality and the formation crude oil quality of the optimal solution, and finally calculating the formation oil content of the drilling fluid No. 1.
TABLE 1 drilling fluid 1# oil cut results
| Sample name | Base fluid mass/g | Mass of crude oil in stratum per gram | Oil content of |
| Drilling fluid | |||
| 1# | 2.5126 | 0.1128 | 4.2965% |
The technical characteristics which are not described in the invention are matched by adopting the mature prior art.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A method for testing the oil content of a full oil-based drilling fluid stratum is characterized by comprising the following steps:
(1) preparing base liquid standard sample of full-oil-based drilling fluid
Firstly, taking base fluid of the full-oil-based drilling fluid before taking down a well, and respectively adding base fluid with different masses into 7ml standard sample bottles;
(2) preparing oil content standard sample of full oil-based drilling fluid stratum
Selecting stratum crude oil with the same property as crude oil in the full-oil-based drilling fluid as a calibration sample, preparing full-oil-based drilling fluid base fluid with the same quality, and adding stratum crude oil with different qualities into the base fluid, thereby obtaining stratum oil content calibration samples of the full-oil-based drilling fluid with different qualities;
(3) correlation modeling analysis
Collecting CPMG nuclear magnetic resonance signals of all oil-based drilling fluid base fluid standard samples and CPMG nuclear magnetic resonance signals of all oil-based drilling fluid stratum oil content standard samples by using a CPMG sequence;
by utilizing the first 50 nuclear magnetic resonance signals of the CPMG, 50 unary linear regression equations S can be obtainedi base fluid＝ki base fluidmBase liquid+bi base fluidFormula and 50 unary linear regression equations Sj crude oil＝kj crude oilmCrude oil+bj crude oilThereby obtaining a series of Si base fluid、ki base fluid、bi base fluidAnd Sj crude oil、kj crude oil、bj crude oil；
The unary linear regression equation takes the mass of the base fluid as a horizontal coordinate and the nuclear magnetic resonance signal of the base fluid as a vertical coordinate for the base fluid of the all-oil-based drilling fluid to obtain the unary linear regression equation, uses 50 nuclear magnetic resonance signals of the base fluid to calculate 50 correlation equations according to the unary linear regression equation, and obtains the correlation coefficient of a linear correlation curve; for the formation crude oil, the mass of the formation crude oil is taken as the abscissa, the nuclear magnetic resonance signal of the formation crude oil is taken as the ordinate, a unitary linear regression equation is obtained, 50 nuclear magnetic resonance signals of the formation crude oil are used, 50 correlation equations are obtained according to the unitary linear regression equation, and the correlation coefficient of a linear correlation curve is obtained;
the nuclear magnetic resonance signal of the formation crude oil is obtained by subtracting the nuclear magnetic resonance signal of the base fluid from the nuclear magnetic resonance signal of the oil content standard sample of the oil-based drilling fluid formation;
(4) calculating the oil content of the oil-based drilling fluid
Testing a sample to be tested to obtain a series of signals S, and performing partial least square fitting on the series of signals S of the sample to be tested and the unary linear regression equation of all the columns to calculate the optimal mBase liquidAnd mCrude oilAnd finally obtaining the stratum oil content of the full oil-based drilling fluid.
2. The method of testing the oil cut of a full oil-based drilling fluid formation of claim 1, wherein:
the base fluid of the full-oil-based drilling fluid is a stock fluid of the full-oil-based drilling fluid before downhole, and the mass range is 1-4 g; the number of the base liquid standard samples is 5-7.
3. The method of testing the oil cut of a full oil-based drilling fluid formation of claim 1, wherein:
the mass range of the base fluid of the full oil-based drilling fluid with the same mass is 2.5-3.5g, the mass range of the formation crude oil with the same property as that of the crude oil in the full oil-based drilling fluid is 0.003-0.5 g, and the formation oil content standards of the full oil-based drilling fluid with different masses are 5-7, and the samples are respectively placed in glass bottles with the capacity of 7ml for sealing.
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| CN101943669B (en) * | 2010-09-01 | 2012-02-22 | 苏州纽迈电子科技有限公司 | Method for measuring oil content of drilling fluid through low-field NMR (Nuclear Magnetic Resonance) |
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