CN111380826B - Method and device for detecting drilling fluid performance - Google Patents
Method and device for detecting drilling fluid performance Download PDFInfo
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- 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
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Abstract
The invention discloses a method and a device for detecting the performance of drilling fluid, and belongs to the technical field of drilling. The method respectively detects the mass concentration and the weight average molecular weight of the treating agent in the filtrate of the drilling fluid by using an ultraviolet-visible spectrophotometry method and an ultracentrifugation sedimentation method, and comprehensively judges the performance of the drilling fluid by combining the detection results of the ultraviolet-visible spectrophotometry method and the ultracentrifugation sedimentation method. The method specifically comprises the following steps: obtaining a standard drilling fluid formula; obtaining a standard characteristic spectrum of each treating agent by using a standard formula and an ultraviolet-visible spectrophotometry; comparing the standard characteristic spectrum according to the actual absorbance of each treating agent in the target drilling fluid filtrate, and determining the mass concentration of each treating agent in the target drilling fluid filtrate; measuring the change condition of the weight average molecular weight of the treating agent in the target drilling fluid and the standard drilling fluid filtrate by using an ultracentrifugation sedimentation method; and comprehensively judging the performance of the target drilling fluid based on the above. The method can simply, reliably, accurately and effectively detect the performance of the drilling fluid, and provides the most direct and reliable thought and method for maintaining and treating the drilling fluid.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a method and a device for detecting the performance of drilling fluid.
Background
The drilling fluid plays an important role in drilling engineering, and can balance formation pressure, carry rock debris, purify a well bore, cool a drilling tool, transmit hydrodynamic force, keep a well wall stable and the like. The drilling fluid comprises: solid-phase particles, various treating agents and liquid phase. The performance of the drilling fluid is important to influence the smooth performance of drilling engineering, and the good performance of the drilling fluid is an important guarantee for safe and efficient drilling. Based on the above, it is necessary to detect the drilling fluid to facilitate drilling with the drilling fluid having good performance.
The related art analyzes the performance of the drilling fluid by detecting parameters such as the fluid loss property, the rheological property and the like of the drilling fluid.
The inventors found that the related art has at least the following problems:
in the related art, when the drilling fluid is detected, the method is only limited to measuring conventional performance parameters and other apparent data, and the intrinsic cause of the performance change of the drilling fluid cannot be accurately determined. The essential reason of the drilling fluid performance change needs to be indirectly inferred through multiple combined experiments, the working efficiency is low, and the accuracy of the analysis result is low.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting the performance of drilling fluid, which can solve the technical problem. The specific technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a method for detecting performance of a drilling fluid, where the method includes:
obtaining a standard formula of each treating agent in the standard drilling fluid filtrate;
acquiring a standard characteristic spectrum of each treating agent in the standard drilling fluid filtrate according to a standard formula of each treating agent and an ultraviolet-visible spectrophotometry;
according to the ultraviolet-visible spectrophotometry and the standard characteristic spectrum of each treating agent, acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength;
determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the actual absorbance, the standard characteristic spectrum and the standard formula of each treating agent in the target drilling fluid filtrate;
obtaining the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method;
and determining the performance of the target drilling fluid according to the standard formula of each treating agent in the standard drilling fluid filtrate, the mass concentration of each treating agent in the target drilling fluid filtrate, the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate.
In one possible design, the obtaining a standard formulation for each treatment agent in a standard drilling fluid filtrate comprises:
determining a basic formula of the standard drilling fluid filtrate according to the block structure characteristics of the target oil-gas field, the pressure coefficient of the stratum, the lithology characteristics of the stratum, the well body structure and the operation working condition;
determining a first specified mass concentration of each treating agent in the standard drilling fluid filtrate according to the operation well section of the target oil and gas field, construction requirements of different densities and a basic formula of the standard drilling fluid filtrate;
obtaining a standard formulation for each treatment agent in the standard drilling fluid filtrate according to the first specified mass concentration of each treatment agent.
In one possible design, the obtaining a standard characteristic spectrum for each treatment agent in the standard drilling fluid filtrate according to a standard formulation and uv-vis spectrophotometry for each treatment agent comprises:
respectively preparing standard liquid with each treating agent with second specified mass concentration in the standard drilling fluid filtrate according to the standard formula of each treating agent;
and acquiring the standard characteristic spectrum of the treating agent corresponding to each standard solution according to the ultraviolet-visible spectrophotometry.
In one possible design, the obtaining the actual absorbance of each treatment agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the uv-vis spectrophotometry and the standard characteristic spectrum of each treatment agent comprises:
determining the specific absorption wavelength corresponding to each treating agent according to the standard characteristic spectrum of each treating agent;
and acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the corresponding specific absorption wavelength of each treating agent.
In one possible design, the determining the mass concentration of each treatment agent in the target drilling fluid filtrate from the actual absorbance of each treatment agent in the target drilling fluid filtrate, a standard characteristic spectrum, a standard formulation of each treatment agent comprises:
according to the standard characteristic spectrum, acquiring a specific absorption wavelength of a corresponding treating agent in the standard drilling fluid filtrate and standard absorbance at the specific absorption wavelength;
determining the mass concentration of each treatment agent in the target drilling fluid filtrate according to the standard absorbance of each treatment agent at a specific absorption wavelength, the actual absorbance, and the standard formula of each treatment agent.
In another aspect, an embodiment of the present invention provides an apparatus for detecting properties of drilling fluid, where the apparatus includes:
the first acquisition module is used for acquiring a standard formula of each treating agent in the standard drilling fluid filtrate;
the second acquisition module is used for acquiring the standard characteristic spectrum of each treating agent in the standard drilling fluid filtrate according to the standard formula of each treating agent and an ultraviolet-visible spectrophotometry;
the third acquisition module is used for acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the standard characteristic spectrum of each treating agent;
the first determination module is used for determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the actual absorbance, the standard characteristic spectrum and the standard formula of each treating agent in the target drilling fluid filtrate;
the fourth acquisition module is used for acquiring the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method;
a second determination module for determining the performance of the target drilling fluid based on the standard formulation of each treating agent in the standard drilling fluid filtrate, the mass concentration of each treating agent in the target drilling fluid filtrate, the weight average molecular weight of the treating agent in the standard drilling fluid filtrate, and the weight average molecular weight of the treating agent in the target drilling fluid filtrate.
In one possible design, the first obtaining module includes:
the first determination unit is used for determining a basic formula of the standard drilling fluid filtrate according to the block structure characteristics of the target oil-gas field, the pressure coefficient of the stratum, the lithology characteristics of the stratum, the well body structure and the operation working condition;
the second determination unit is used for determining the first specified mass concentration of each treating agent in the standard drilling fluid filtrate according to the operation well section of the target oil and gas field, the construction requirements of different densities and the basic formula of the standard drilling fluid filtrate;
a first obtaining unit for obtaining a standard formulation of each treatment agent in the standard drilling fluid filtrate according to a first specified mass concentration of each treatment agent.
In one possible design, the second obtaining module is configured to:
respectively preparing standard liquid with each treating agent with second specified mass concentration in the standard drilling fluid filtrate according to the standard formula of each treating agent;
and acquiring the standard characteristic spectrum of the treating agent corresponding to each standard solution according to the ultraviolet-visible spectrophotometry.
In one possible design, the third obtaining module includes:
a third determining unit, which is used for determining the specific absorption wavelength corresponding to each treating agent according to the standard characteristic spectrum of each treating agent;
and the second acquisition unit is used for acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the corresponding specific absorption wavelength of each treating agent.
In one possible design, the first determining module includes:
the third acquisition unit is used for acquiring the specific absorption wavelength of the corresponding treating agent in the standard drilling fluid filtrate and the standard absorbance at the specific absorption wavelength according to the standard characteristic spectrum;
and the fourth determination unit is used for determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the standard absorbance of each treating agent at a specific absorption wavelength, the actual absorbance and the standard formula of each treating agent.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the method for detecting the performance of the drilling fluid, provided by the embodiment of the invention, whether the target drilling fluid filtrate meets the design requirement or not can be determined from the aspect of mass concentration by obtaining and according to the standard formula of each treating agent in the standard drilling fluid filtrate and the mass concentration of each treating agent in the target drilling fluid filtrate. Whether the target drilling fluid filtrate meets the design requirements or not can be determined from the aspects of degradation and crosslinking degree by obtaining and according to the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate. The method is characterized in that known substances are detected by an ultraviolet-visible spectrophotometry method, new substances generated by degradation and crosslinking reactions are detected by an ultracentrifugal sedimentation method, and whether the performance of the target drilling fluid meets the design requirements or not and the essential reason of the performance change of the drilling fluid can be accurately determined by combining the two aspects. The method can simply, reliably, accurately and effectively determine the mass concentration of each treating agent of the drilling fluid filtrate and the weight average molecular weight of the treating agent in the drilling fluid filtrate, is beneficial to analyzing the internal reasons of the performance change of the drilling fluid, provides the most direct and reliable thought and method for maintaining the drilling fluid, and can obviously improve the working efficiency and the comprehensive economic benefit of the drilling fluid industry.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used 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 invention, 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 detecting the performance of a drilling fluid provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a device for detecting properties of drilling fluid according to an embodiment of the present invention.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that in the embodiment of the present invention, the drilling fluid filtrate refers to: and filtering the drilling fluid to obtain a uniform solution without solid-phase impurities.
Ultraviolet-visible spectrophotometry is a method for determining the absorbance of a substance in the wavelength range of 200 to 1000nm, for identification, impurity inspection and quantitative determination. When light passes through the solution of the substance to be measured, the absorption degree of the substance to the light changes along with the difference of the wavelength of the light, so the absorption spectrum of the substance to be measured is obtained by measuring the absorbance of the substance at different wavelengths and drawing a relation graph of the absorbance and the wavelength. From the absorption spectrum, the maximum absorption wavelength λ can be determined max And minimum absorption wavelength λ min . Different substances have different molecular structures and have specific ultraviolet-visible light absorption spectrums, so that qualitative and quantitative analysis can be performed on the substances by adopting an ultraviolet-visible spectrophotometry. Specifically, in performing qualitative analysis, substances can be identified by comparing the actual spectrum of a sample in a particular wavelength range with a standard spectrum, or by determining the wavelength of maximum absorption, or by measuring the ratio of the absorption at two particular wavelengths. When quantitative analysis is carried out, the absorbance of a sample solution with a certain concentration is measured at the maximum absorption wavelength, and is compared with the absorbance of a control solution with a known concentration, or the absorbance is calculated by adopting an absorption coefficient method, so that the concentration of the sample solution can be obtained. The ultraviolet-visible spectrophotometry is used for measuring the concentration of the substance, and the method is simple to operate and high in sensitivity and accuracy.
The speed range at which the ultracentrifuge operates is large, up to 1000 revolutions per second, resulting in centrifugal forces several hundred thousand times the gravity force, which enables the ultracentrifuge to detect molecular weight values as small as sucrose and as large as viruses. The ultracentrifuge sedimentation method using an ultracentrifuge determines the absolute molecular weight of the molecule, which does not require any standard sample as a reference, nor does it require knowledge of the shape and hydration of the sample molecules. The ultracentrifugal sedimentation method can be used for measuring the molecular weight of a multi-component sample, the corresponding sedimentation coefficient can be calculated according to the sedimentation peak of each component, and the weight average molecular weight of the solute can be calculated by combining the diffusion coefficient.
Based on this, in one aspect, the embodiment of the present invention provides a method for detecting the performance of drilling fluid, as shown in fig. 1, the method includes:
Optionally, step 101 includes, but is not limited to, the following three substeps:
step 1011, determining a basic formula of the standard drilling fluid filtrate according to the block structure characteristics of the target oil-gas field, the pressure coefficient of the stratum, the lithology characteristics of the stratum, the well structure and the operation condition.
Specifically, a mature basic formula of the optimal drilling fluid is selected preferably according to different block structure characteristics, pressure coefficients of different layers, lithological characteristics of different stratums, different well structures and different operation conditions of the target oil-gas field, and relevant data are stored.
And 1012, determining a first specified mass concentration of each treating agent in the standard drilling fluid filtrate according to the operation well section of the target oil-gas field, the construction requirements of different densities and the basic formula of the standard drilling fluid filtrate.
Specifically, the optimal addition range of various treating agents in the drilling fluid formula, namely the first specified mass concentration, is determined according to construction requirements of different operation well sections, different densities and the like of a target oil-gas field.
And 1013, acquiring a standard formula of each treating agent in the standard drilling fluid filtrate according to the first specified mass concentration of each treating agent.
After a standard formulation of standard drilling fluid filtrate is obtained, it is saved as a first database.
For example, for a long-leg drilling operation of a horizontal well of a longmaxi shale reservoir of the longmaxi shale gas block in the Sichuan basin, the standard formulation corresponding to the standard drilling fluid filtrate is: water +0.5% -0.8% A +3% -5% B +0.5% -1% C +2% -4% D +4% -6% E +0.3% -0.5% F + …, where A, B, C, D, E, F represents various treating agents in the drilling fluid standard formulation, such as a fluid loss additive, an inhibitor, a lubricant, etc.
And 102, acquiring a standard characteristic spectrum of each treating agent in the standard drilling fluid filtrate according to the standard formula of each treating agent and an ultraviolet-visible spectrophotometry.
Optionally, step 102 includes, but is not limited to, the following two substeps:
step 1021, according to the standard formula of each treating agent, respectively preparing standard liquid with each treating agent in the standard drilling fluid filtrate as second specified mass concentration.
Specifically, according to a standard formula of standard drilling fluid filtrate, single treating agent aqueous solutions such as A, B, C, D, E, F with the mass concentration of the second specified mass concentration are prepared respectively. Each treating agent aqueous solution was a standard solution.
And step 1022, acquiring the standard characteristic spectrum of each treating agent according to an ultraviolet-visible spectrophotometry.
Specifically, characteristic absorption spectrum curves of single treating agent aqueous solutions such as A, B, C, D, E, F and the like are respectively detected by an ultraviolet-visible spectrophotometry.
And 103, acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to an ultraviolet-visible spectrophotometry and the standard characteristic spectrum of each treating agent.
Optionally, step 103 includes, but is not limited to, the following two substeps:
and step 1031, determining the specific absorption wavelength corresponding to each treatment agent according to the standard characteristic spectrum of each treatment agent.
Specifically, from the standard characteristic spectrum of each treatment agent, it is possible to determine which wavelength the treatment agent has the highest or lowest absorption peak, i.e., the most significant absorbance, as the specific absorption wavelength corresponding to the treatment agent. The absorption wavelength corresponding to the maximum absorbance in the standard characteristic spectrum curve of each treatment agent may be sequentially numbered as λ max A 、λ max B 、λ max C 、λ max D 、λ max E 、λ max F . Based on this, a second database of maximum absorbance, specific absorption wavelength, second specified mass concentration is established.
And step 1032, acquiring actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the specific absorption wavelength corresponding to each treating agent.
And detecting the actual absorbance of the filtrate of the target drilling fluid at the specific absorption wavelength by adopting an ultraviolet-visible spectrophotometry according to the specific absorption wavelength corresponding to each treating agent.
When the actual absorption spectrum of a certain treating agent in the target drilling fluid filtrate is measured, if the difference between the actual absorption spectrum at a specific absorption wavelength and the standard characteristic spectrum is large, the treating agent is probably not present in the target drilling fluid filtrate. If the actual absorption spectrum at a particular absorption wavelength is similar to or less apart from the standard characteristic spectrum, then the presence of the treatment agent in the target drilling fluid filtrate is indicated.
When the actual absorbance of each treating agent in the target drilling fluid filtrate is detected, the treating agents in the target drilling fluid filtrate are mixed with each other, so that the phenomenon of mutual interference among the components is inevitable. Thus, a targeted interference-reducing factor can be selected according to the treatment agent contained.
For example, a specific masking agent may be selected based on the treatment agent contained or a derivative approach may be used to eliminate or minimize the interference factors, and a derivative uv-vis spectroscopy approach may be selected to eliminate or minimize the interference factors. Derivative UV-Vis spectroscopy is the derivative of absorbance with respect to wavelength (d) n A/dλ n ) For a spectrum of wavelengths, derivative spectra of different orders can be obtained as n varies.
In this way, two or more different treatment agents having close absorbencies at specific wavelengths can be clearly separated.
And step 104, determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the actual absorbance, the standard characteristic spectrum and the standard formula of each treating agent in the target drilling fluid filtrate.
And judging whether the drilling fluid performance meets the design requirements and the essential reason of the drilling fluid performance change according to the standard formula of the standard drilling fluid filtrate and the mass concentration of each treating agent in the target drilling fluid filtrate.
Optionally, step 104 includes, but is not limited to, the following several substeps:
and 1041, acquiring a specific absorption wavelength of the corresponding treating agent in the standard drilling fluid filtrate and a standard absorbance at the specific absorption wavelength according to the standard characteristic spectrum.
Specifically, the specific absorption wavelength and the standard absorbance at the specific absorption wavelength of each treatment agent in the standard drilling fluid filtrate are obtained from the standard characteristic spectra in the second database.
And 1042, determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the standard absorbance and the actual absorbance of each treating agent at a specific absorption wavelength and the standard formula of each treating agent.
Specifically, the mass concentration of a certain treating agent in the target drilling fluid filtrate can be calculated and obtained through the following formula.
C x ＝C s A x /A s (1)
Wherein, C s Is the mass concentration of a certain treating agent in the standard drilling fluid filtrate. A. The s Is the absorbance of a certain treating agent in a standard drilling fluid filtrate. C x Is the mass concentration of a certain treating agent in the target drilling fluid filtrate. A. The x Is the absorbance of a certain treating agent in the target drilling fluid filtrate.
And 105, obtaining the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method.
It should be noted that the weight average molecular weight of the treating agent in the drilling fluid filtrate refers to the statistical average molecular weight of all treating agents in the drilling fluid filtrate by mass, and the average molecular weight is obtained in unit weight.
In the filtrate of the drilling fluid, part of the treating agents are degraded into micromolecular substances from macromolecular substances under the actions of shearing, bacteria, high temperature and the like, and part of the treating agents interact under the high-temperature condition to generate a crosslinking reaction and crosslink the micromolecular substances into the macromolecular substances. The degradation performance and the degree of crosslinking of the treatment agent in the drilling fluid filtrate can be determined, via step 105.
And step 106, determining the performance of the target drilling fluid according to the standard formula of each treating agent in the standard drilling fluid filtrate, the mass concentration of each treating agent in the target drilling fluid filtrate, the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate.
Comparing the standard formula of each treating agent with the mass concentration of each treating agent in the target drilling fluid filtrate can determine whether the mass concentration of each treating agent in the target drilling fluid filtrate meets the design requirements. The weight average molecular weight of the treating agent in the target drilling fluid filtrate is compared with the weight average molecular weight of the treating agent in the standard drilling fluid filtrate, so that the degradation and crosslinking degree of the treating agent in the target drilling fluid filtrate can be determined, and whether the target drilling fluid filtrate meets the design requirement or not is further determined.
Based on steps 101 through 106 above, the mass concentration of each treatment agent in the target drilling fluid filtrate can be accurately determined.
Obtaining the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugation sedimentation method, and judging the change condition of the weight average molecular weight, wherein the change condition comprises the following steps:
and (3) obtaining the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method, comparing the change conditions of the weight average molecular weights of the treating agent in the target drilling fluid and the treating agent in the standard drilling fluid, and judging the degree of degradation and crosslinking reaction of the treating agent.
And comparing the standard formula according to the mass concentration and the weight average molecular weight of each treating agent in the target drilling fluid filtrate, and comprehensively judging the performance of the target drilling fluid.
As an example, according to the mass concentration of each treating agent in the target drilling fluid filtrate and the standard formula of the standard drilling fluid filtrate in the first database, according to the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate, which treating agent is excessive and which treating agent is insufficient are determined, and then whether the mass concentration of the treating agent in the target drilling fluid filtrate meets the design and construction requirements is known, and the internal cause and development trend of the drilling fluid performance change are diagnosed.
For example, the filtration loss of the target drilling fluid filtrate is increased, and whether the addition of the fluid loss additive is insufficient can be judged according to the detection result, so that the inherent reason of the drilling fluid performance change can be diagnosed. The change trend of the performance of the drilling fluid can be judged in advance according to the retention amount and the consumption amount of the treating agent in the drilling fluid filtrate. Meanwhile, in a mudstone stratum, the dosage of the high molecular polymer is large due to the requirement of drilling engineering, but the high molecular polymer can be degraded into small molecular substances under the actions of shearing, bacteria, high temperature and the like, the weight average molecular weight of the high molecular polymer is obviously reduced, and the function of the high molecular polymer is lost. In deep drilling, in order to meet engineering requirements, a plurality of high-temperature resistant materials are used in large quantities, and the materials are subjected to cross-linking reaction under a high-temperature condition, so that small molecular substances are cross-linked into large molecular substances, the weight average molecular weight of the materials is remarkably increased, and the performance of the drilling fluid is obviously changed.
As an example, a maintenance treatment protocol for a drilling fluid filtrate may be determined based on the mass concentration of each treatment agent in the target drilling fluid filtrate.
Specifically, the mass concentration of each treating agent in the target drilling fluid filtrate can be judged according to the first database, a targeted treatment measure is formulated for the excessive or insufficient treating agent, and a high-efficiency and accurate drilling fluid maintenance treatment scheme is formulated by combining conventional performance parameters, drilling working conditions and other field operation conditions. For example, if the detection result shows that the increase of the fluid loss of the drilling fluid is caused by insufficient concentration content after the fluid loss agent is consumed, the fluid loss agent can be supplemented to meet the requirement of design dosage. By detecting the weight average molecular weight, if it is determined that the high molecular polymer is degraded too much, the high molecular polymer needs to be supplemented, and if it is determined that the degree of crosslinking of the high temperature treatment agent is high, the amount of the relevant treatment agent needs to be appropriately reduced.
Based on the above, the method for detecting the performance of the drilling fluid provided by the embodiment of the invention can determine whether the target drilling fluid filtrate meets the design requirements from the aspect of mass concentration by obtaining and according to the standard formula of each treating agent in the standard drilling fluid filtrate and the mass concentration of each treating agent in the target drilling fluid filtrate. Whether the target drilling fluid filtrate meets the design requirements or not can be determined from the aspects of degradation and crosslinking degree by obtaining and according to the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate. The method is characterized in that known substances are detected by an ultraviolet-visible spectrophotometry method, new substances generated by degradation and crosslinking reactions are detected by an ultracentrifugal sedimentation method, and whether the properties of the drilling fluid meet design requirements or not and the essential reasons of the property change of the drilling fluid can be accurately determined by combining the two aspects. The method can simply, reliably, accurately and effectively determine the mass concentration of each treating agent in the drilling fluid filtrate and the weight average molecular weight of the treating agent in the drilling fluid filtrate, is beneficial to analyzing the internal reasons of the performance change of the drilling fluid, provides the most direct and reliable thought and method for maintaining the drilling fluid, and can obviously improve the working efficiency and comprehensive economic benefit of the drilling fluid industry.
In another aspect, an embodiment of the present invention provides an apparatus for detecting properties of drilling fluid, as shown in fig. 2, the apparatus includes:
a first obtaining module 1 for obtaining a standard formulation of a standard drilling fluid filtrate, the standard drilling fluid filtrate comprising a plurality of treating agents.
And the second acquisition module 2 is used for acquiring the standard characteristic spectrum of each treating agent in the standard drilling fluid filtrate according to the standard formula and the ultraviolet-visible spectrophotometry.
And the third acquisition module 3 is used for acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to an ultraviolet-visible spectrophotometry and the standard characteristic spectrum of each treating agent.
And the first determination module 4 is used for determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the actual absorbance, the standard characteristic spectrum and the standard formula of each treating agent in the target drilling fluid filtrate.
And the fourth acquisition module 5 is used for acquiring the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method.
And the second determination module 6 is used for determining the performance of the target drilling fluid according to the standard formula of each treating agent in the standard drilling fluid filtrate, the mass concentration of each treating agent in the target drilling fluid filtrate, the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate.
Optionally, the first obtaining module 1 includes:
the first determination unit is used for determining a basic formula of the standard drilling fluid filtrate according to the block structure characteristics of the target oil-gas field, the pressure coefficient of the stratum, the lithology characteristics of the stratum, the well body structure and the operation working condition.
And the second determination unit is used for determining the first specified mass concentration of each treating agent in the standard drilling fluid filtrate according to the operation well section of the target oil-gas field, the construction requirements of different densities and the basic formula of the standard drilling fluid filtrate.
And the first obtaining unit is used for obtaining a standard formula of each treating agent in the standard drilling fluid filtrate according to the first specified mass concentration of each treating agent.
Optionally, the second obtaining module 2 is configured to:
and respectively preparing standard liquid with a second specified mass concentration as each treating agent in the standard drilling fluid filtrate according to a standard formula.
And (3) acquiring the standard characteristic spectrum of the treating agent corresponding to each standard solution according to an ultraviolet-visible spectrophotometry.
Optionally, the third obtaining module 3 includes:
and the third determining unit is used for determining the specific absorption wavelength corresponding to each treating agent according to the standard characteristic spectrum of each treating agent.
And the second acquisition unit is used for acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the corresponding specific absorption wavelength of each treating agent.
Optionally, the first determining module 4 includes:
and the third acquisition unit is used for acquiring the specific absorption wavelength of the corresponding treating agent in the standard drilling fluid filtrate and the standard absorbance at the specific absorption wavelength according to the standard characteristic spectrum.
And the fourth determination unit is used for determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the standard absorbance of each treating agent at a specific absorption wavelength, the actual absorbance and the standard formula of each treating agent. And judging whether the drilling fluid performance meets the design requirements and the essential reasons of the drilling fluid performance change according to the standard formula of the standard drilling fluid filtrate and the mass concentration of each treating agent in the target drilling fluid filtrate.
According to the device for detecting the performance of the drilling fluid, provided by the embodiment of the invention, whether the target drilling fluid filtrate meets the design requirements or not can be determined from the aspect of mass concentration by obtaining and according to the standard formula of each treating agent in the standard drilling fluid filtrate and the mass concentration of each treating agent in the target drilling fluid filtrate. Whether the target drilling fluid filtrate meets the design requirements or not can be determined from the aspects of degradation and crosslinking degree by obtaining and according to the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate. The method is characterized in that known substances are detected by an ultraviolet-visible spectrophotometry method, new substances generated by degradation and crosslinking reactions are detected by an ultracentrifugal sedimentation method, and whether the performance of the drilling fluid meets design requirements or not and the essential reason of the performance change of the drilling fluid can be accurately determined by combining the two aspects. The detection device can simply, reliably, accurately and effectively determine the mass concentration of each treating agent in the filtrate of the drilling fluid and the weight-average molecular weight of the treating agent in the filtrate of the drilling fluid, is favorable for analyzing the internal reasons of the performance change of the drilling fluid, provides the most direct and reliable thought and method for maintaining the drilling fluid, and obviously improves the working efficiency and comprehensive economic benefit of the drilling fluid industry.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the above functions may be distributed by different functional modules as needed, that is, the internal structure of the device may be divided into different functional modules to implement all or part of the functions described above. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
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 an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of detecting a property of a drilling fluid, the method comprising:
obtaining a standard formula of each treating agent in the standard drilling fluid filtrate;
acquiring a standard characteristic spectrum of each treating agent in the standard drilling fluid filtrate according to a standard formula of each treating agent and an ultraviolet-visible spectrophotometry;
according to the ultraviolet-visible spectrophotometry and the standard characteristic spectrum of each treating agent, acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength;
determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the actual absorbance, the standard characteristic spectrum and the standard formula of each treating agent in the target drilling fluid filtrate;
obtaining the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method;
comparing the standard formula of each treating agent in the standard drilling fluid filtrate with the mass concentration of each treating agent in the target drilling fluid filtrate to obtain a first comparison result;
comparing the weight average molecular weight of the treating agent in the target drilling fluid filtrate with the weight average molecular weight of the treating agent in the standard drilling fluid filtrate to obtain a second comparison result; wherein the second comparison is used to indicate the degree of degradation and crosslinking of the treatment agent in the target drilling fluid filtrate;
and determining the performance of the target drilling fluid according to the first comparison result and the second comparison result.
2. The method of claim 1, wherein obtaining a standard formulation for each treatment agent in a standard drilling fluid filtrate comprises:
determining a basic formula of the standard drilling fluid filtrate according to the block structure characteristics of the target oil-gas field, the pressure coefficient of the stratum, the lithology characteristics of the stratum, the well body structure and the operation working condition;
determining a first specified mass concentration of each treating agent in the standard drilling fluid filtrate according to the operation well section of the target oil and gas field, construction requirements of different densities and a basic formula of the standard drilling fluid filtrate;
obtaining a standard formulation for each treatment agent in the standard drilling fluid filtrate according to the first specified mass concentration of each treatment agent.
3. The method of claim 1, wherein the obtaining a standard characteristic spectrum for each treatment agent in the standard drilling fluid filtrate from a standard formulation and uv-vis spectrophotometry for each treatment agent comprises:
respectively preparing standard liquid with a second specified mass concentration as each treating agent in the standard drilling fluid filtrate according to the standard formula of each treating agent;
and acquiring the standard characteristic spectrum of the treating agent corresponding to each standard solution according to the ultraviolet-visible spectrophotometry.
4. The method of claim 1, wherein obtaining the actual absorbance of each treatment agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength based on the uv-vis spectrophotometry and a standard characteristic spectrum of each treatment agent comprises:
determining the specific absorption wavelength corresponding to each treating agent according to the standard characteristic spectrum of each treating agent;
and acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the corresponding specific absorption wavelength of each treating agent.
5. The method of any one of claims 1-4, wherein determining the mass concentration of each treatment agent in the target drilling fluid filtrate from the actual absorbance of each treatment agent in the target drilling fluid filtrate, a standard characteristic spectrum, a standard formulation for each treatment agent comprises:
according to the standard characteristic spectrum, acquiring a specific absorption wavelength of a corresponding treating agent in the standard drilling fluid filtrate and standard absorbance at the specific absorption wavelength;
determining the mass concentration of each treatment agent in the target drilling fluid filtrate according to the standard absorbance of each treatment agent at a specific absorption wavelength, the actual absorbance, and the standard formula of each treatment agent.
6. An apparatus for detecting properties of drilling fluid, the apparatus comprising:
the first acquisition module is used for acquiring a standard formula of each treating agent in the standard drilling fluid filtrate;
the second acquisition module is used for acquiring the standard characteristic spectrum of each treating agent in the standard drilling fluid filtrate according to the standard formula of each treating agent and an ultraviolet-visible spectrophotometry;
the third acquisition module is used for acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the standard characteristic spectrum of each treating agent;
the first determination module is used for determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the actual absorbance, the standard characteristic spectrum and the standard formula of each treating agent in the target drilling fluid filtrate;
the fourth acquisition module is used for acquiring the weight average molecular weight of the treating agent in the standard drilling fluid filtrate and the weight average molecular weight of the treating agent in the target drilling fluid filtrate according to an ultracentrifugal sedimentation method;
the second determination module is used for comparing the standard formula of each treating agent in the standard drilling fluid filtrate with the mass concentration of each treating agent in the target drilling fluid filtrate to obtain a first comparison result; comparing the weight average molecular weight of the treating agent in the target drilling fluid filtrate with the weight average molecular weight of the treating agent in the standard drilling fluid filtrate to obtain a second comparison result; wherein the second comparison is used to indicate the degree of degradation and crosslinking of the treatment agent in the target drilling fluid filtrate; and determining the performance of the target drilling fluid according to the first comparison result and the second comparison result.
7. The apparatus of claim 6, wherein the first obtaining module comprises:
the first determination unit is used for determining a basic formula of the standard drilling fluid filtrate according to the block structure characteristics of the target oil-gas field, the pressure coefficient of the stratum, the lithology characteristics of the stratum, the well body structure and the operation working condition;
the second determination unit is used for determining the first specified mass concentration of each treating agent in the standard drilling fluid filtrate according to the operation well section of the target oil and gas field, the construction requirements of different densities and the basic formula of the standard drilling fluid filtrate;
a first obtaining unit for obtaining a standard formulation of each treatment agent in the standard drilling fluid filtrate according to a first specified mass concentration of each treatment agent.
8. The apparatus of claim 6, wherein the second obtaining module is configured to:
respectively preparing standard liquid with each treating agent with second specified mass concentration in the standard drilling fluid filtrate according to the standard formula of each treating agent;
and acquiring the standard characteristic spectrum of the treating agent corresponding to each standard solution according to the ultraviolet-visible spectrophotometry.
9. The apparatus of claim 6, wherein the third obtaining module comprises:
a third determining unit, which is used for determining the specific absorption wavelength corresponding to each treating agent according to the standard characteristic spectrum of each treating agent;
and the second acquisition unit is used for acquiring the actual absorbance of each treating agent in the target drilling fluid filtrate at the corresponding specific absorption wavelength according to the ultraviolet-visible spectrophotometry and the corresponding specific absorption wavelength of each treating agent.
10. The apparatus of any of claims 6-9, wherein the first determining module comprises:
the third acquisition unit is used for acquiring the specific absorption wavelength of the corresponding treating agent in the standard drilling fluid filtrate and the standard absorbance at the specific absorption wavelength according to the standard characteristic spectrum;
and the fourth determination unit is used for determining the mass concentration of each treating agent in the target drilling fluid filtrate according to the standard absorbance of each treating agent at a specific absorption wavelength, the actual absorbance and the standard formula of each treating agent.
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