CN112986162B - Method and device for judging drilling fluid inhibition - Google Patents
Method and device for judging drilling fluid inhibition Download PDFInfo
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Abstract
The application discloses a method and a device for judging the inhibition of drilling fluid, and belongs to the technical field of drilling. The method comprises the following steps: filtering the drilling fluid to obtain a filter cake and 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 inhibition of the drilling fluid through the content of the aluminum element and the content of the inhibitor. According to the method, the quality of the inhibitor in the drilling fluid filtrate and the content of the mudstone clay in the drilling fluid are not required to be tested through a titration method, the test cannot be 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 the inhibition of drilling fluid.
Background
The drilling fluid plays a vital role in drilling engineering, and mainly has important roles of balancing formation pressure, suspending carried rock debris, cleaning and purifying a well bore, cooling a drilling tool, transmitting pressure, keeping a well wall stable and the like. The smooth proceeding of the drilling engineering and the well complex accident handling and the excellent drilling fluid performance have very close relations, and the good drilling fluid performance is an important guarantee of safe, efficient and rapid drilling. Wherein 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 the filtrate of the drilling fluid are main marks of the inhibition of the drilling fluid. Therefore, the drilling fluid needs to be tested for inhibition before drilling so that the drilling fluid meets the construction requirements during construction.
In the related technology, a titration method is adopted to detect the mass concentration of hydrolyzed polyacrylamide in the filtrate of the drilling fluid and the content of mudstone clay in the drilling fluid, and the inhibition of the drilling fluid is judged according to the content of hydrolyzed polyacrylamide and the content of mudstone clay in the drilling fluid.
However, the titration method is affected by various factors such as reagents, personnel operation, experimental conditions and the like, so that the accuracy of the test results is low, the data of the test results of different experimental personnel are greatly different, and the comprehensive inhibition of the drilling fluid cannot be accurately distinguished.
Content of the application
The embodiment of the application provides a method and a device for judging the inhibition of drilling fluid, which can solve the problems that in the related art, 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, the data of the test results of different experimental personnel are greatly different, and the comprehensive inhibition of the drilling fluid cannot be accurately distinguished. 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 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 inhibition of the drilling fluid 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 a 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 filtrate max Absorbance at a maximum absorption wavelength lambda according to the inhibitor in the filtrate max The absorbance at the position is used for obtaining the content of the inhibitor in the filtrate.
Optionally, the step of obtaining the inhibitor in the filtrate at the maximum absorption wavelength lambda max Absorbance at, comprising:
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 range max Absorbance at, maximum absorption wavelength lambda of inhibitor of the concentration range max Absorbance at maximum absorption wavelength lambda as inhibitor in the filtrate max Absorbance at.
Optionally, the obtaining the concentration range of the inhibitor in the filtrate includes:
and determining the concentration range of the inhibitor in the filtrate according to the block structure of the oil-gas field and the hydration characteristics of clay minerals in mudstones.
Optionally, the determining the drilling fluid inhibition by the content of the aluminum element and the inhibitor includes:
acquiring the content variation trend of the aluminum element, and acquiring the content variation trend of the inhibitor;
and judging the inhibition of the drilling fluid according to the content change trend of the aluminum element and the content change trend of the inhibitor.
Optionally, the obtaining the content of aluminum element in the dried filter cake includes:
and obtaining the content of aluminum element in the dried filter cake at a preset frequency through 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;
a first obtaining unit for obtaining the content of 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 property through the content of the aluminum element and the content of the inhibitor.
Optionally, a drying unit is used for drying the filter cake to a preset weight at a temperature of 150-220 ℃ to obtain the dried filter cake.
Optionally, a second acquisition unit for acquiring the absorption maximum wavelength lambda of the inhibitor in the filtrate max Absorbance at a maximum absorption wavelength lambda according to the inhibitor in the filtrate max The absorbance at the position is used for obtaining the content of the inhibitor in the filtrate.
The beneficial effects that technical scheme that this application embodiment provided include at least:
according to the method provided by the embodiment of the application, the quality of the inhibitor in the drilling fluid filtrate and the content of the mudstone clay in the drilling fluid are not required to be tested through 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.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining drilling fluid inhibition provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for judging the inhibition of drilling fluid according to 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. For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The drilling fluid plays a vital role in drilling engineering, and mainly has important roles of balancing formation pressure, suspending carried rock debris, cleaning and purifying a well bore, cooling a drilling tool, transmitting pressure, keeping a well wall stable and the like. The smooth proceeding of the drilling engineering and the well complex accident handling have a very close relation with the excellent performance of the drilling fluid, and the good performance of the drilling fluid is an important guarantee of safe, efficient and quick drilling, and the advantages and disadvantages of the drilling fluid performance are closely related to the success and failure of the drilling engineering.
When drilling a mudstone stratum, the easily dispersible mudstone with strong water sensitivity is easily hydrated and dispersed into fine particles which enter a drilling fluid system to damage the overall performance of the drilling fluid. To prevent mudstone hydration dispersion, inhibitors, such as the common hydrolyzed polyacrylamides, are often added to the drilling fluid to increase the inhibition capacity of the drilling fluid. Therefore, in the related art, the inhibition 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 pass titration test, and as 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, the data of test results of different experimental personnel have large differences, and the comprehensive inhibition of the drilling fluid cannot be accurately distinguished. In view of this, the embodiment of the application provides a method for judging the inhibition of drilling fluid.
In one aspect, an embodiment of the present application provides a method for determining the inhibition of drilling fluid, as shown in fig. 1, where the method includes:
and 101, filtering the drilling fluid to obtain a filter cake and filtrate.
The components in the drilling fluid comprise clear water, slurry, clay-free phase flushing fluid, emulsion, foam, compressed air and the like. Thus, a cake of solid phase and a filtrate of liquid phase can be obtained by filtration.
Optionally, step 102 includes: and (3) drying the filter cake to a preset weight at a temperature of 150-220 ℃ to obtain a dried filter cake.
It should be noted that, the preset weight in the embodiment of the present application means that the weight of the filter cake is not changed any more, and by way of example, the filter cake may be dried multiple times and then weighed, and when the weight of the filter cake is not changed any more, the filter cake to be dried is obtained.
The filtered filter cake contains part of liquid, and the filter cake is dried at high temperature to obtain a dried filter cake. Illustratively, the temperature of the drying may be 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, etc. The filter cake is dried until its weight does not change.
And 103, obtaining the content of aluminum element in the dried filter cake.
It should be noted that, different types of mudstones have different chemical compositions, but all contain aluminum element, and the aluminum element content is higher. 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 the content of aluminum element in the filter cake is detected to be high, for example, when the content of aluminum element in the drilling fluid exceeds 100g/cm3, it is indicated that the inhibition of the drilling fluid is not good and the dispersion degree of mudstone is high. When the content of aluminum element in the drilling fluid is detected to be low, for example, when the content of aluminum element in the drilling fluid is less than 100g/cm < 3 >, the drilling fluid is proved to well inhibit the dispersion of mudstone and have good inhibition performance.
Optionally, step 103 includes: and obtaining the content of aluminum element in the dried filter cake at a preset frequency through a metal element detector.
The metal element detector can measure the absorbance of a substance, is used for identification, impurity inspection and quantitative determination, and different molecular structures have specific ultraviolet-visible absorption spectrums, so that the metal element detector is a basic basis for qualitative and quantitative analysis of the substance. The metal element detector can conveniently, rapidly 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 into the drilling fluid to inhibit the dispersion of mudstone, so when the inhibitor consumed in the drilling fluid is more, the drilling fluid has a better inhibition effect. 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 by embodiments of the present application may be hydrolyzed polyacrylamide.
Optionally, step 104 includes: step 1041 and step 1042.
Step 1041, obtaining the maximum absorption wavelength lambda of the inhibitor in the filtrate max Absorbance at.
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 spectra are different, namely, the characteristic spectrum of each substance has uniqueness.
The characteristic absorption spectrum curve of the inhibitor is measured by ultraviolet-visible spectrophotometry, and the highest point of the peak in the spectrum curve is the maximum absorption wavelength lambda max 。
Optionally, step 1041 includes:
obtaining the concentration range of the inhibitor in the filtrate;
measuring inhibitor in concentration range by ultraviolet-visible spectrophotometry to obtain maximum absorption wavelength lambda of inhibitor in concentration range max Absorbance at maximum absorption wavelength lambda as inhibitor in the filtrate max Absorbance at.
As an example, when the inhibitor is hydrolyzed polyacrylamide, the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate may be calculated against a characteristic spectrum curve of hydrolyzed polyacrylamide at a concentration of 0.1% by mass. By way of example, the characteristic absorption spectrum curve is measured by ultraviolet-visible spectrophotometry, the maximum absorption wavelength in the spectrum curve being lambda max The absorbance a corresponding to the maximum absorption wavelength is the absorbance of 0.1% by mass concentration.
By way of 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 comparative solution at λ max Absorbance at the point, as is absorbance of drilling fluid filtrate measured under the same condition, and Cx is mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate.
Optionally, step 1041 includes:
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 clay minerals in mudstones.
The method is characterized in that the structural blocks of the oil-gas field are different, the hydration characteristics of minerals in mudstones are also different, and the optimal concentration range of the inhibitor in the drilling fluid filtrate when the good effect of inhibiting the hydration dispersion of clay is achieved is determined according to the hydration characteristics of clay minerals in different structural blocks of the oil-gas field and different layers of mudstones. For example, aiming at a mudstone stratum with strong hydration dispersibility, the mass concentration range of the hydrolyzed polyacrylamide is required to be kept between 0.4 and 0.6 percent; for the mudstone stratum with medium dispersivity, the mass concentration range of the hydrolyzed polyacrylamide is required to be kept between 0.2% and 0.4%.
Step 1042, according to the maximum absorption wavelength lambda of the inhibitor in the filtrate max The absorbance at the position is inhibited in the filtrateThe content of the agent.
And 105, judging the drilling fluid inhibition by the content of the aluminum element and the content of the inhibitor.
Optionally, step 105 includes: step 1051, step 1052, and step 1053.
And 1051, obtaining the content change trend of the aluminum element.
And measuring the mass concentration of the aluminum element in the drilling fluid mud cake by using a metal element detector, determining the detection frequency according to the production progress in actual operation, measuring the mass concentration of the aluminum element in the drilling fluid mud cake at the determined detection frequency, and accurately recording the measurement result of each time. For example, before drilling into a mudstone stratum, detecting the mass concentration of aluminum element in a drilling fluid mud cake as a basic value; in the drilling process, a detection frequency is formulated according to the drilling speed, and the detection frequency can be one time a day or two times a day, so that the mass concentration of the aluminum element in the drilling fluid mud cake is detected.
And drawing a mass concentration change curve of the aluminum element in the drilling fluid mud cake according to the multiple detection results. And according to the mass concentration of the aluminum element in the drilling fluid mud cake, comparing the basic values, analyzing the mass concentration change trend of the aluminum element, and judging the degree of increasing or decreasing the content of the mudstone clay mineral in the drilling fluid.
For example, the mass concentration of aluminum element in the drilling fluid mud cake is obviously increased, and when the mass concentration of aluminum element in the drilling fluid exceeds 100g/cm < 3 >, the aluminum element shows that a large amount of clay mineral of mudstone is dispersed into the drilling fluid system, so that the current inhibition capability of the drilling fluid is insufficient, and the drilling engineering requirement cannot be met.
Step 1052, obtaining the content change trend of the inhibitor.
Detecting or measuring the content change of the inhibitor for multiple times, and drawing a concentration change curve of the inhibitor in the drilling fluid filtrate 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 consumption rate of the inhibitor and a low mass concentration of the inhibitor at present indicate a potential insufficient inhibition capacity of the drilling fluid system.
And 1053, judging the inhibition of the drilling fluid according to the content change trend of the aluminum element and the content change trend of the inhibitor.
As an example, mud rock is dispersed into the drilling fluid to damage the performance of the drilling fluid, and according to the mass concentration change curve of aluminum element in a mud cake of the drilling fluid and the mass concentration change curve of inhibitor (such as hydrolyzed polyacrylamide) in filtrate of the drilling fluid, comprehensive analysis is performed to judge whether the inhibition capability of the drilling fluid meets the drilling engineering requirement, and the internal cause and development trend of the change of the performance of the drilling fluid can be judged.
By way of example, when the mass concentration of aluminum element in the drilling fluid mud cake exceeds 100g/cm3, the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate is less than 100g/cm3, which indicates that the current inhibition capability of the drilling fluid is seriously insufficient, the consumption of hydrolyzed polyacrylamide is needed to be supplemented, and the solid control efficiency is improved to clear the mudstone in the drilling fluid system.
When the mass concentration of the aluminum element in the drilling fluid mud cake is not changed, the aluminum element content in the drilling fluid is 100g/cm before construction 3 When the content of aluminum element in the drilling fluid is 100g/cm < 3 > after construction for a period of time or the drilling fluid floats at a change of about 1% -5%, the content change of aluminum element in the drilling fluid is not obvious, the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate is obviously reduced, for example, the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate is sharply reduced from 50% to 10% from the beginning, and the inhibition capability of the drilling fluid system is insufficient and the consumption of hydrolyzed polyacrylamide needs to be supplemented.
When the mass concentration of aluminum element in the drilling fluid mud cake is obviously reduced and the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate is obviously increased, the inhibition capability of the drilling fluid system is good, and the consumption of hydrolyzed polyacrylamide is required to be reduced so as to save the cost.
When the mass concentration of aluminum element in the drilling fluid mud cake is increased and the mass concentration of hydrolyzed polyacrylamide in the drilling fluid filtrate is increased, the inhibition capability of the drilling fluid is insufficient, the inhibition capability of the inhibitor is weak, and the inhibitor needs to be assisted to achieve a good inhibition effect.
After the inhibition of the drilling fluid is judged by the method provided by the embodiment of the invention, the drilling fluid maintenance treatment scheme can be determined according to the judgment result, and the efficient and accurate drilling fluid maintenance treatment scheme can be formulated by combining the conventional performance parameters, the drilling working conditions and other field operation conditions.
According to the method provided by the embodiment of the application, the quality of the inhibitor in the drilling fluid filtrate and the content of the mudstone clay in the drilling fluid are not required to be tested 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.
In another aspect, an embodiment of the present application provides a device for determining the inhibition of drilling fluid, referring to fig. 2, the device includes:
a filtering unit 201, configured to filter the drilling fluid to obtain a filter cake and a filtrate;
a drying unit 202, configured to dry the filter cake at a preset temperature to obtain a dried filter cake;
a first obtaining unit 203 for obtaining the content of aluminum element in the dried cake;
a second obtaining unit 204, configured to obtain a content of an inhibitor in the filtrate;
and a judging unit 205 for judging the drilling fluid inhibition by the content of the aluminum element and the content of the inhibitor.
Optionally, a drying unit 202 is used for drying the filter cake to constant weight at a temperature of 150-220 ℃ to obtain a dried filter cake.
Optionally, the first obtaining unit 203 is configured to obtain, by using a metal element detector, the content of aluminum element in the dried filter cake at a preset frequency.
Optionally, the second acquisition unit 204 includes a first sub-acquisition unit and a second sub-acquisition unit;
the first sub-acquisition unit is used for acquiring the maximum absorption of the inhibitor in the filtrateWavelength lambda of the received light max Absorbance at;
a second sub-acquisition unit for acquiring the maximum absorption wavelength lambda according to the inhibitor in the filtrate max The absorbance at the position is used for obtaining the content of the inhibitor in the filtrate.
Optionally, the first sub-acquisition unit is used for acquiring a concentration range of the inhibitor in the filtrate;
measuring inhibitor in concentration range by ultraviolet-visible spectrophotometry to obtain maximum absorption wavelength lambda of inhibitor in concentration range max Absorbance at maximum absorption wavelength lambda as inhibitor in the filtrate max Absorbance at.
Optionally, the first sub-acquisition 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 clay minerals in mudstone.
Optionally, the judging 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 inhibition of the drilling fluid according to 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 at least the following technical effects:
the device that this application embodiment provided, the quality of inhibitor and the content of mudstone clay in the drilling fluid among the drilling fluid filtrate need not be tested through titration method, and the test can not receive reagent, personnel's operation and experimental condition's influence, and adopt the result of this method judgement accurate, the accuracy is high, has improved the work efficiency and the comprehensive economic benefits of drilling fluid trade.
Any combination of the above-mentioned optional solutions may be adopted to form an optional embodiment of the present disclosure, which is not described herein in detail.
The foregoing description of the illustrative embodiments of the present application is not intended to limit the scope of the present application, but is intended to cover any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present application.
Claims (5)
1. A method for determining drilling fluid inhibition, the method comprising:
filtering the drilling fluid before drilling into the target stratum to obtain a filter cake and 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 at a preset frequency through a metal element detector;
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 range max Absorbance at, maximum absorption wavelength lambda of inhibitor of the concentration range max Absorbance at maximum absorption wavelength lambda as inhibitor in the filtrate max Absorbance at;
according to the maximum absorption wavelength lambda of the inhibitor in the filtrate max Absorbance at the position to obtain the content of the inhibitor in the filtrate;
determining a detection frequency according to the drilling speed in the process of drilling the target stratum;
periodically measuring the content of aluminum element in the drilling fluid filter cake and the content of inhibitor in the filtrate based on the detection frequency;
according to the multiple measurement results, drawing a content change curve of aluminum element in the drilling fluid filter cake and a content change curve of the inhibitor;
taking the content of aluminum element in the drilling fluid filter cake as a basic value before drilling the target stratum, comparing the content of aluminum element in the content change curve of aluminum element with the basic value, and determining the content change trend of aluminum element;
determining the content change trend of the inhibitor according to the content change curve of the inhibitor;
and judging the inhibition of the drilling fluid according to the content change trend of the aluminum element and the content change trend of the inhibitor.
2. The method of claim 1, wherein said drying said filter cake at a predetermined temperature results in a dried filter cake comprising:
and drying the filter cake to a preset weight at a temperature of 150-220 ℃ to obtain the dried filter cake.
3. The method of claim 1, 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-gas field and the hydration characteristics of clay minerals in mudstones.
4. A drilling fluid inhibition determination apparatus, the apparatus comprising:
the filtering unit is used for filtering the drilling fluid before drilling into the target stratum 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;
a first obtaining unit for obtaining the content of aluminum element in the dried filter cake at a preset frequency by a metal element detector;
a second acquisition unit for acquiring a 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 range max Absorbance at, maximum absorption wavelength lambda of inhibitor of the concentration range max Absorbance at maximum absorption wavelength lambda as inhibitor in the filtrate max Absorbance at; according to the maximum absorption wavelength lambda of the inhibitor in the filtrate max Absorbance at the position to obtain the content of the inhibitor in the filtrate;
the judging unit is used for determining the detection frequency according to the drilling speed in the process of drilling the target stratum; periodically measuring the content of aluminum element in the drilling fluid filter cake and the content of inhibitor in the filtrate based on the detection frequency; according to the multiple measurement results, drawing a content change curve of aluminum element in the drilling fluid filter cake and a content change curve of the inhibitor; taking the content of aluminum element in the drilling fluid filter cake as a basic value before drilling the target stratum, comparing the content of aluminum element in the content change curve of aluminum element with the basic value, and determining the content change trend of aluminum element; determining the content change trend of the inhibitor according to the content change curve of the inhibitor; and judging the inhibition of the drilling fluid according to the content change trend of the aluminum element and the content change trend of the inhibitor.
5. The apparatus of claim 4, wherein a 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.
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