CN112986162A - Method and device for judging drilling fluid inhibition - Google Patents
Method and device for judging drilling fluid inhibition Download PDFInfo
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- CN112986162A CN112986162A CN201911295653.6A CN201911295653A CN112986162A CN 112986162 A CN112986162 A CN 112986162A CN 201911295653 A CN201911295653 A CN 201911295653A CN 112986162 A CN112986162 A CN 112986162A
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- 238000005553 drilling Methods 0.000 title claims abstract description 153
- 239000012530 fluid Substances 0.000 title claims abstract description 134
- 230000005764 inhibitory process Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003112 inhibitor Substances 0.000 claims abstract description 92
- 239000000706 filtrate Substances 0.000 claims abstract description 69
- 239000012065 filter cake Substances 0.000 claims abstract description 60
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000001035 drying Methods 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims description 27
- 238000002835 absorbance Methods 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 23
- 230000036571 hydration Effects 0.000 claims description 9
- 238000006703 hydration reaction Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002734 clay mineral Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000000870 ultraviolet spectroscopy Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 abstract description 14
- 238000004448 titration Methods 0.000 abstract description 9
- 239000004927 clay Substances 0.000 abstract description 8
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 229920002401 polyacrylamide Polymers 0.000 description 24
- 230000002401 inhibitory effect Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000000862 absorption spectrum Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
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- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011418 maintenance treatment Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 238000002798 spectrophotometry method Methods 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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Abstract
The application discloses a method and a device for judging drilling fluid inhibition, and belongs to the technical field of drilling. The method comprises the following steps: filtering the drilling fluid to obtain a filter cake and a filtrate; drying the filter cake at a preset temperature to obtain a dried filter cake; obtaining the content of aluminum element in the dried filter cake; obtaining the content of the inhibitor in the filtrate; and judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor. The method provided by the application does not need to test the quality of the inhibitor in the filtrate of the drilling fluid and the content of mudstone clay in the drilling fluid by a titration method, the test is not influenced by reagents, personnel operation and experimental conditions, the judgment result is accurate by adopting the method, the accuracy is high, and the working efficiency and the comprehensive economic benefit of the drilling fluid industry are improved.
Description
Technical Field
The application relates to the technical field of drilling, in particular to a method and a device for judging drilling fluid inhibition.
Background
The drilling fluid plays an important role in drilling engineering, and mainly plays important roles in balancing formation pressure, suspending and carrying rock debris, cleaning and purifying a borehole, cooling a drilling tool, transferring pressure, keeping a borehole wall stable and the like. The smooth operation of the drilling engineering, the treatment of complex underground accidents and the excellent performance of the drilling fluid are closely related, and the good performance of the drilling fluid is an important guarantee for safe, efficient and rapid drilling. The inhibition of the drilling fluid is one of the main properties of the drilling fluid, and the content of mudstone clay in the drilling fluid and the mass concentration of hydrolyzed polyacrylamide in a filtrate of the drilling fluid are main marks of the inhibition of the drilling fluid. Therefore, the inhibitive performance of the drilling fluid needs to be tested before drilling, so that the drilling fluid can meet the construction requirements during construction.
In the related technology, the mass concentration of the hydrolyzed polyacrylamide in the filtrate of the drilling fluid and the content of mudstone clay in the drilling fluid are detected by a titration method, and the inhibitive performance of the drilling fluid is judged according to the content of the hydrolyzed polyacrylamide and the mudstone clay in the drilling fluid.
However, the titration method is influenced by various factors such as reagents, personnel operation, experimental conditions and the like, so that the accuracy of the test result is low, the data of the test result of different experimenters are greatly different, and the comprehensive inhibition of the drilling fluid cannot be accurately distinguished.
Content of application
The embodiment of the application provides a method and a device for judging drilling fluid inhibition, and the problems that in the related technology, a titration method is influenced by various factors such as reagents, personnel operation, experimental conditions and the like, the accuracy of a test result is low, the difference of test result data of different experimenters is large, and the comprehensive inhibition of the drilling fluid cannot be accurately distinguished can be solved. The technical scheme is as follows:
in one aspect, a method for determining drilling fluid inhibition is provided, the method comprising:
filtering the drilling fluid to obtain a filter cake and a filtrate;
drying the filter cake at a preset temperature to obtain a dried filter cake;
obtaining the content of aluminum element in the dried filter cake;
obtaining the content of the inhibitor in the filtrate;
and judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor.
Optionally, the drying the filter cake at a preset temperature to obtain a dried filter cake includes:
and drying the filter cake to a preset weight at the temperature of 150-220 ℃ to obtain the dried filter cake.
Optionally, the obtaining the content of the inhibitor in the filtrate includes:
obtaining the maximum absorption wavelength lambda of the inhibitor in the filtratemaxAccording to the absorbance of the inhibitor in the filtrate at the maximum absorption wavelength lambdamaxThe absorbance of (b) to obtain the content of the inhibitor in the filtrate.
Optionally, obtaining the inhibitor in the filtrate at the wavelength of maximum absorption λmaxThe absorbance of (a) includes:
obtaining the concentration range of the inhibitor in the filtrate;
performing ultraviolet-visible spectrophotometry on the inhibitor in the concentration range to obtain the maximum absorption wavelength lambda of the inhibitor in the concentration rangemaxThe maximum absorption wavelength λ of the inhibitor in the concentration rangemaxAs an inhibitor in the filtrate at the maximum absorption wavelength lambdamaxAbsorbance of (d) in (d).
Optionally, the obtaining a concentration range of the inhibitor in the filtrate comprises:
and determining the concentration range of the inhibitor in the filtrate according to the block structure of the oil and gas field and the hydration characteristics of the clay mineral in the mudstone.
Optionally, the judging the drilling fluid inhibition through the content of the aluminum element and the inhibitor comprises:
acquiring the content variation trend of the aluminum element and the content variation trend of the inhibitor;
and judging the drilling fluid inhibition through the content change trend of the aluminum element and the content change trend of the inhibitor.
Optionally, the obtaining the content of the aluminum element in the dried filter cake comprises:
and acquiring the content of the aluminum element in the dried filter cake at a preset frequency by a metal element detector.
In another aspect, a device for determining drilling fluid inhibition is provided, the device comprising:
the filtering unit is used for filtering the drilling fluid to obtain a filter cake and filtrate;
the drying unit is used for drying the filter cake at a preset temperature to obtain a dried filter cake;
the first obtaining unit is used for obtaining the content of the aluminum element in the dried filter cake;
a second obtaining unit for obtaining the content of the inhibitor in the filtrate;
and the judging unit is used for judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor.
Optionally, a drying unit, configured to dry the filter cake to a preset weight at a temperature of 150 ℃ to 220 ℃ to obtain the dried filter cake.
Optionally, a second obtaining unit for obtaining the maximum absorption wavelength λ of the inhibitor in the filtratemaxAccording to the absorbance of the inhibitor in the filtrate at the maximum absorption wavelength lambdamaxThe absorbance of (b) to obtain the content of the inhibitor in the filtrate.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
according to the method provided by the embodiment of the application, the quality of the inhibitor in the filtrate of the drilling fluid and the content of mudstone clay in the drilling fluid do not need to be tested by a titration method, the test is not influenced by reagents, personnel operation and experimental conditions, the judgment result is accurate and high in accuracy, and the working efficiency and the comprehensive economic benefit of the drilling fluid industry are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining drilling fluid inhibition provided by an embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for determining drilling fluid inhibition provided in an embodiment of the present application.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art. To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The drilling fluid plays an important role in drilling engineering, and mainly plays important roles in balancing formation pressure, suspending and carrying rock debris, cleaning and purifying a borehole, cooling a drilling tool, transferring pressure, keeping a borehole wall stable and the like. The smooth operation of the drilling engineering, the treatment of complex underground accidents and the excellent performance of the drilling fluid are closely related, the excellent performance of the drilling fluid is an important guarantee for safe, efficient and rapid drilling, and the quality of the performance of the drilling fluid is closely related to the success or failure of the drilling engineering.
When drilling into a mudstone stratum, the easily dispersible mudstone with strong water sensitivity is easily hydrated and dispersed into fine particles to enter a drilling fluid system to destroy the overall performance of the drilling fluid. To prevent the mudstone from dispersing by hydration, inhibitors, such as the usual hydrolyzed polyacrylamides, are often added to the drilling fluid, thereby increasing the inhibition capacity of the drilling fluid. Therefore, in the related art, the inhibitive performance of the drilling fluid is generally judged by detecting the content of hydrolyzed polyacrylamide in the drilling fluid and the content of aluminum element in the drilling fluid, but the method needs to perform titration test, and because the titration method is influenced by various factors such as reagents, personnel operation, experimental conditions and the like, the accuracy of test results is low, and the difference of test result data of different experimenters is large, the comprehensive inhibitive performance of the drilling fluid cannot be accurately distinguished. In view of this, the embodiment of the present application provides a method for determining drilling fluid inhibition.
In one aspect, an embodiment of the present application provides a method for determining drilling fluid inhibition, as shown in fig. 1, the method includes:
The components of the drilling fluid include clear water, mud, clay-free phase flushing fluid, emulsion, foam, compressed air and the like. Therefore, a solid-phase cake and a liquid-phase filtrate can be obtained by filtration.
And 102, drying the filter cake at a preset temperature to obtain a dried filter cake.
Optionally, step 102 comprises: and drying the filter cake at the temperature of 150-220 ℃ to a preset weight to obtain a dried filter cake.
It should be noted that the preset weight referred to in the embodiments of the present application means that the weight of the filter cake does not change any more, and for example, the filter cake may be dried for multiple times, and then the filter cake is weighed, and when the weight of the filter cake does not change any more, the desired dried filter cake is obtained.
And (3) the filtered filter cake contains part of liquid, and the filter cake is dried at high temperature to obtain a dried filter cake. For example, the temperature for drying may be 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ or the like. The filter cake was dried until its weight did not change.
And 103, obtaining the content of the aluminum element in the dried filter cake.
It should be noted that different kinds of mudstones have different chemical compositions, but all of them contain aluminum element, and the content of aluminum element is high. Therefore, the inhibition of the drilling fluid can be judged by testing the content of the aluminum element in the drilling fluid.
As an example, when a high content of aluminum in the filter cake is detected, for example, when the aluminum in the drilling fluid exceeds 100g/cm3, the drilling fluid is not well inhibited and the dispersion degree of the mudstone is high. When the content of the aluminum element in the drilling fluid is detected to be low, for example, when the content of the aluminum element in the drilling fluid is less than 100g/cm3, the drilling fluid is proved to be better in inhibiting the dispersion of the mudstone and has better inhibition.
Optionally, step 103 comprises: and acquiring the content of the aluminum element in the dried filter cake at a preset frequency by a metal element detector.
The metal element detector can measure the absorbance of the substance for identification, impurity detection and quantitative determination, and different molecular structures have specific ultraviolet-visible absorption spectrums, which are the basic basis for qualitative and quantitative analysis of the substance. The metal element detector can conveniently, quickly and accurately measure the content of most metal elements according to different structures of different elements.
And 104, obtaining the content of the inhibitor in the filtrate.
It should be noted that the inhibitor is added to the drilling fluid to inhibit the dispersion of mudstone, so that the drilling fluid has a better inhibiting effect when more inhibitor is consumed in the drilling fluid. Therefore, the inhibition of the drilling fluid can be judged by simultaneously detecting the consumption of the inhibitor content in the drilling fluid and the content of the aluminum element in the drilling fluid.
As an example, the inhibitor provided in the examples herein may be hydrolyzed polyacrylamide.
Optionally, step 104 comprises: step 1041 and step 1042.
Step 1041, obtaining the maximum absorption wavelength λ of the inhibitor in the filtratemaxAbsorbance of (d) in (d).
As an example, when the inhibitor is hydrolyzed polyacrylamide, its characteristic absorption spectrum curve is measured using uv-vis spectrophotometry for a specific concentration of hydrolyzed polyacrylamide. The molecular structures of different substances are different, and the ultraviolet-visible light absorption spectrums of the substances are different, namely the characteristic spectrum of each substance has uniqueness.
It is to be noted that the characteristic absorption spectrum curve of the inhibitor is measured by an ultraviolet-visible spectrophotometry, and the highest point position of a peak in the spectrum curve is the maximum absorption wavelength lambdamax。
Optionally, step 1041 comprises:
obtaining the concentration range of the inhibitor in the filtrate;
measuring the inhibitor in the concentration range by ultraviolet-visible spectrophotometry to obtain the maximum absorption wavelength lambda of the inhibitor in the concentration rangemaxAbsorbance of (b) as an inhibitor in the filtrate at the maximum absorption wavelength λmaxAbsorbance of (d) in (d).
As an example, when the inhibitor is hydrolyzed polyacrylamide, the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate may be calculated against the characteristic spectral curve of hydrolyzed polyacrylamide at a mass concentration of 0.1%. Illustratively, the characteristic absorption spectrum curve is measured by UV-visible spectrophotometry, and the maximum absorption wavelength in the spectrum curve is lambdamaxThen, the absorbance A at the maximum absorption wavelength is 0.1% by mass.
For example, the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate can be calculated by the following formula: cx CsAx/As, where Cs is the comparison solution at λmaxAnd the absorbance, As is the absorbance of the drilling fluid filtrate measured under the same conditions, and Cx is the mass concentration of the hydrolyzed polyacrylamide in the drilling fluid filtrate.
Optionally, step 1041 comprises:
and determining the concentration range of the inhibitor in the filtrate according to the block structure of the oil and gas field and the hydration characteristics of the clay minerals in the mudstone.
It should be noted that the oil and gas fields have different structural blocks and different hydration characteristics of minerals in mudstones, and the optimal concentration range of the inhibitor in the drilling fluid filtrate when the good effect of inhibiting the hydration and dispersion of the clay is achieved is determined according to the hydration characteristics of the clay minerals in the mudstones at different structural blocks and different positions of the oil and gas fields. For example, aiming at a mudstone stratum with strong hydration dispersibility, the mass concentration range of the hydrolyzed polyacrylamide needs to be kept between 0.4 and 0.6 percent; for a middle-dispersion mudstone stratum, the mass concentration range of the hydrolyzed polyacrylamide needs to be kept between 0.2 and 0.4 percent.
1042, according to the maximum absorption wavelength lambda of the inhibitor in the filtratemaxThe absorbance of the solution obtained above gives the content of the inhibitor in the filtrate.
And 105, judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor.
Optionally, step 105 comprises: step 1051, step 1052 and step 1053.
And 1051, acquiring the content change trend of the aluminum element.
The mass concentration of the aluminum element in the mud cake of the drilling fluid is measured by using a metal element detector, the detection frequency is determined according to the production progress in actual operation, the mass concentration of the aluminum element in the mud cake of the drilling fluid is measured at the determined monitoring frequency, and the measurement result of each time is accurately recorded. For example, before drilling into a mudstone formation, the mass concentration of aluminum element in a mud cake of the drilling fluid is detected as a basic value; in the drilling process, the detection frequency is set according to the drilling speed, for example, the detection frequency can be once a day or once every two days, and the mass concentration of the aluminum element in the mud cake of the drilling fluid is detected.
And drawing a mass concentration change curve of the aluminum element in the mud cake of the drilling fluid according to the multiple detection results. And comparing the basic values according to the mass concentration of the aluminum element in the mud cake of the drilling fluid, analyzing the change trend of the mass concentration of the aluminum element, and judging the degree of increase or decrease of the content of the mudstone clay mineral in the drilling fluid.
For example, the mass concentration of aluminum in mud cake of drilling fluid is obviously increased, and for example, when the mass concentration of aluminum in the drilling fluid exceeds 100g/cm3, the mud clay mineral is greatly dispersed into the drilling fluid system, which indicates that the current inhibition capability of the drilling fluid is insufficient and cannot meet the requirements of drilling engineering.
And 1052, acquiring the content change trend of the inhibitor.
And detecting or measuring the content change of the inhibitor for multiple times, and drawing a concentration change curve of the inhibitor in the filtrate of the drilling fluid according to the detection results for multiple times. And analyzing the consumption speed of the inhibitor in the drilling process according to the mass concentration change curve of the inhibitor, and comprehensively judging the potential inhibition capability of the drilling fluid by combining the formation lithology. For example, a fast rate of inhibitor consumption and a low mass concentration of the current inhibitor indicates a potential insufficient inhibition capacity of the drilling fluid system.
And 1053, judging the drilling fluid inhibition through the content change trend of the aluminum element and the content change trend of the inhibitor.
As an example, mud rock dispersed into the drilling fluid can destroy the performance of the drilling fluid, and according to the mass concentration change curve of the aluminum element in the mud cake of the drilling fluid and the mass concentration change curve of the inhibitor (such as hydrolyzed polyacrylamide) in the filtrate of the drilling fluid, whether the inhibition capacity of the drilling fluid meets the requirements of drilling engineering or not is comprehensively analyzed and judged, and the internal reason and the development trend of the performance change of the drilling fluid can be judged.
For example, when the mass concentration of aluminum in the mud cake of the drilling fluid exceeds 100g/cm3, and the mass concentration of hydrolyzed polyacrylamide in the filtrate of the drilling fluid is less than 100g/cm3, the current inhibition capability of the drilling fluid is seriously insufficient, and the dosage of the hydrolyzed polyacrylamide needs to be supplemented and the solid control efficiency needs to be improved to remove mudstone in a drilling fluid system.
When the mass concentration of the aluminum element in the mud cake of the drilling fluid is not changed, for example, the content of the aluminum element in the drilling fluid is 100g/cm before construction3After construction for a period of time, the content of the aluminum element in the drilling fluid is still 100g/cm3, or the aluminum element floats around 100g/cm3 by 1-5 percent change, which indicates that the content of the aluminum element in the drilling fluid does not change obviously, and the mass concentration of the hydrolyzed polyacrylamide in the filtrate of the drilling fluid is obviously reducedFor example, if the mass concentration of the hydrolyzed polyacrylamide in the filtrate of the drilling fluid is sharply reduced from 50% to 10% from the beginning, the inhibition capability of the drilling fluid system is insufficient, and the dosage of the hydrolyzed polyacrylamide needs to be supplemented.
When the mass concentration of the aluminum element in the mud cake of the drilling fluid is obviously reduced and the mass concentration of the hydrolyzed polyacrylamide in the filtrate of the drilling fluid is obviously increased, the inhibition capability of the drilling fluid system is good, and the dosage of the hydrolyzed polyacrylamide needs to be reduced to save the cost.
When the mass concentration of the aluminum element in the mud cake of the drilling fluid is increased and the mass concentration of the hydrolyzed polyacrylamide in the filtrate of the drilling fluid is increased, the inhibition capability of the drilling fluid is insufficient, the inhibition capability of the inhibitor is not strong, and the inhibitor needs to be assisted to achieve a good inhibition effect.
It should be noted that after the inhibition of the drilling fluid is judged by the method provided by the embodiment of the invention, a drilling fluid maintenance treatment scheme can be determined according to the judgment result, and an efficient and accurate drilling fluid maintenance treatment scheme can be formulated by combining with the field operation conditions such as conventional performance parameters, drilling working conditions and the like.
By the method provided by the embodiment of the application, the quality of the inhibitor in the filtrate of the drilling fluid and the content of mudstone clay in the drilling fluid do not need to be tested by a titration method, the test is not influenced by reagents, personnel operation and experimental conditions, the judgment result is accurate and high in accuracy, and the working efficiency and the comprehensive economic benefit of the drilling fluid industry are improved.
In another aspect, an embodiment of the present application provides a device for determining drilling fluid inhibition, referring to fig. 2, the device includes:
the filtering unit 201 is used for filtering the drilling fluid to obtain a filter cake and a filtrate;
the drying unit 202 is used for drying the filter cake at a preset temperature to obtain a dried filter cake;
a first obtaining unit 203, configured to obtain a content of an aluminum element in the dried filter cake;
a second obtaining unit 204, configured to obtain the content of the inhibitor in the filtrate;
and the judging unit 205 is used for judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor.
Optionally, a drying unit 202 for drying the filter cake to a constant weight at a temperature of 150 ℃ to 220 ℃ to obtain a dried filter cake.
Optionally, the first obtaining unit 203 is configured to obtain, by a metal element detector, the content of aluminum element in the dried filter cake at a preset frequency.
Optionally, the second obtaining unit 204 includes a first sub-obtaining unit and a second sub-obtaining unit;
the first sub-acquisition unit is used for acquiring the maximum absorption wavelength lambda of the inhibitor in the filtratemaxAbsorbance of (d);
the second sub-acquisition unit is used for acquiring the maximum absorption wavelength lambda of the inhibitor in the filtratemaxThe absorbance of the solution obtained above gives the content of the inhibitor in the filtrate.
Optionally, the first sub-obtaining unit is used for obtaining the concentration range of the inhibitor in the filtrate;
measuring the inhibitor in the concentration range by ultraviolet-visible spectrophotometry to obtain the maximum absorption wavelength lambda of the inhibitor in the concentration rangemaxAbsorbance of (b) as an inhibitor in the filtrate at the maximum absorption wavelength λmaxAbsorbance of (d) in (d).
Optionally, the first sub-obtaining unit is used for determining the concentration range of the inhibitor in the filtrate according to the block structure of the oil and gas field and the hydration characteristics of the clay mineral in the mudstone.
Optionally, the determining unit 205 is configured to obtain a content variation trend of the aluminum element, and obtain a content variation trend of the inhibitor;
and judging the drilling fluid inhibition through the content change trend of the aluminum element and the content change trend of the inhibitor.
The device provided by the embodiment of the application has the following technical effects:
the device provided by the embodiment of the application does not need to test the quality of the inhibitor in the filtrate of the drilling fluid and the content of mudstone clay in the drilling fluid by a titration method, the test cannot be influenced by reagents, personnel operation and experimental conditions, the judgment result by adopting the method is accurate, the accuracy is high, and the working efficiency and the comprehensive economic benefit of the drilling fluid industry are improved.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only exemplary of the present application and should not be taken as limiting the scope of the present application, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. A method for determining drilling fluid inhibition, the method comprising:
filtering the drilling fluid to obtain a filter cake and a filtrate;
drying the filter cake at a preset temperature to obtain a dried filter cake;
obtaining the content of aluminum element in the dried filter cake;
obtaining the content of the inhibitor in the filtrate;
and judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor.
2. The method of claim 1, wherein drying the filter cake at a predetermined temperature to obtain a dried filter cake comprises:
and drying the filter cake to a preset weight at the temperature of 150-220 ℃ to obtain the dried filter cake.
3. The method of claim 1, wherein said obtaining the level of inhibitor in the filtrate comprises:
obtaining the maximum absorption wavelength lambda of the inhibitor in the filtratemaxAccording to the absorbance of the inhibitor in the filtrate at the maximum absorption wavelength lambdamaxThe absorbance of (b) to obtain the content of the inhibitor in the filtrate.
4. The method of claim 3, wherein said obtaining said inhibitor in filtrate is at a wavelength of maximum absorption λmaxThe absorbance of (a) includes:
obtaining the concentration range of the inhibitor in the filtrate;
performing ultraviolet-visible spectrophotometry on the inhibitor in the concentration range to obtain the maximum absorption wavelength lambda of the inhibitor in the concentration rangemaxThe maximum absorption wavelength λ of the inhibitor in the concentration rangemaxAs an inhibitor in the filtrate at the maximum absorption wavelength lambdamaxAbsorbance of (d) in (d).
5. The method of claim 4, wherein said obtaining a concentration range of inhibitor in said filtrate comprises:
and determining the concentration range of the inhibitor in the filtrate according to the block structure of the oil and gas field and the hydration characteristics of the clay mineral in the mudstone.
6. The method of claim 1, wherein said determining said drilling fluid inhibition by said aluminum element and said inhibitor content comprises:
acquiring the content variation trend of the aluminum element and the content variation trend of the inhibitor;
and judging the drilling fluid inhibition through the content change trend of the aluminum element and the content change trend of the inhibitor.
7. The method of claim 1, wherein said obtaining the elemental aluminum content of the dried filter cake comprises:
and acquiring the content of the aluminum element in the dried filter cake at a preset frequency by a metal element detector.
8. A device for determining drilling fluid inhibition, the device comprising:
the filtering unit is used for filtering the drilling fluid to obtain a filter cake and filtrate;
the drying unit is used for drying the filter cake at a preset temperature to obtain a dried filter cake;
the first obtaining unit is used for obtaining the content of the aluminum element in the dried filter cake;
a second obtaining unit for obtaining the content of the inhibitor in the filtrate;
and the judging unit is used for judging the drilling fluid inhibition through the content of the aluminum element and the content of the inhibitor.
9. The apparatus of claim 1, wherein the drying unit is configured to dry the filter cake to a predetermined weight at a temperature of 150 ℃ to 220 ℃ to obtain the dried filter cake.
10. The apparatus according to claim 1, characterized by a second taking unit for taking the inhibitor in the filtrate at the maximum absorption wavelength λmaxAccording to the absorbance of the inhibitor in the filtrate at the maximum absorption wavelength lambdamaxThe absorbance of (b) to obtain the content of the inhibitor in the filtrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295653.6A CN112986162B (en) | 2019-12-16 | 2019-12-16 | Method and device for judging drilling fluid inhibition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295653.6A CN112986162B (en) | 2019-12-16 | 2019-12-16 | Method and device for judging drilling fluid inhibition |
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