CN115478835A - Method and device for acquiring underground fluid measurement model - Google Patents
Method and device for acquiring underground fluid measurement model Download PDFInfo
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- CN115478835A CN115478835A CN202110663610.XA CN202110663610A CN115478835A CN 115478835 A CN115478835 A CN 115478835A CN 202110663610 A CN202110663610 A CN 202110663610A CN 115478835 A CN115478835 A CN 115478835A
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- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention discloses a method and a device for acquiring a downhole fluid measurement model, wherein the method comprises the following steps: adjusting the liquid flow of the calibration fluid in the flow simulation well shaft, and recording measurement signals of different liquid flows measured by a noise logging instrument; wherein the calibration fluid contains water in a preset proportion; according to the measuring signal, obtaining a functional relation between the liquid flow of the calibration fluid and the measuring signal; obtaining a signal flow relation according to the function relation corresponding to the calibration fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid. The invention is beneficial to the noise logging instrument to realize the quantitative measurement of the downhole fluid.
Description
Technical Field
The invention relates to the technical field of petroleum geological exploration, in particular to a method and a device for acquiring a downhole fluid measurement model.
Background
The existing liquid production profile testing instrument mostly adopts a turbine flowmeter when measuring the flow, and quantitatively measures the flow of the underground fluid according to the relationship between the rotating speed of the turbine and the flow velocity of the fluid. However, when the turbine flowmeter measures the flow in the heavy oil well, the turbine cannot normally rotate under the influence of the viscosity of the fluid after contacting the fluid, an effective flow signal cannot be obtained, and the flow test result is seriously influenced. At present, most of various flow sensors adopted by petroleum logging are overcurrent flow sensors, so that the application of the flow sensors in the measurement of thick oil flow is limited. Through analysis of the physical processes created by the flow of fluids, vibration signals are generated both from the formation fluid flowing into the wellbore and during the fluid flow in the wellbore, and the sound level of linear low frequency noise generated by the fluid flowing along the tubing and casing varies in relation to the fluid flow rate. The flow rate can thus be determined by analyzing the noise generated in the pipe by the fluid from the signals measured by the noise tool. However, when the existing noise logging technology measures the flow, the quantitative measurement of the flow cannot be realized, and the application of the noise logging instrument in the field is limited.
Disclosure of Invention
In view of the above problems, the present invention provides a method and an apparatus for obtaining a downhole fluid measurement model, which is beneficial for a noise logging tool to perform quantitative measurement on downhole fluid.
In a first aspect, the present application provides the following technical solutions through an embodiment:
a downhole fluid measurement model acquisition method, comprising:
adjusting the liquid flow of the calibration fluid in the flow simulation well bore, and recording measurement signals of different liquid flows measured by a noise logging instrument; wherein the scale fluid contains water in a preset proportion; according to the measuring signal, obtaining a functional relation between the liquid flow of the scale fluid and the measuring signal; obtaining a signal flow relation according to the functional relation corresponding to the scale fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
Optionally, the adjusting the flow rate simulates a liquid flow rate of a calibration fluid in the wellbore, and includes:
gradually increasing the liquid flow in the flow simulation well bore from zero; and maintaining the preset time length after each increase, wherein the larger the liquid flow is, the larger the adjustment step length is.
Optionally, the gradually increasing the flow rate of the liquid in the flow rate simulation wellbore from zero includes:
according to the flow size of 0m 3 /d、5m 3 /d、10m 3 /d、50m 3 /d、100m 3 /d、150m 3 D increasing the liquid flow rate.
Optionally, the preset time period is greater than or equal to 10min.
Optionally, the obtaining a functional relationship between the liquid flow rate of the calibration fluid and the measurement signal according to the measurement signal includes:
obtaining a spectrogram according to the measuring signal; respectively obtaining the maximum amplitude value of a low frequency band, the maximum amplitude value of a medium frequency band, the maximum amplitude value of a high frequency band and the maximum amplitude value of a full frequency band corresponding to each liquid flow according to the spectrogram; and obtaining a functional relation between the liquid flow of the scale fluid and the measurement signal according to the maximum amplitude value of the low frequency band, the maximum amplitude value of the medium frequency band, the maximum amplitude value of the high frequency band and the maximum amplitude value of the full frequency band corresponding to each liquid flow.
Optionally, the obtaining the functional relationship between each liquid flow and the corresponding measurement signal respectively by using the maximum amplitude value of the low frequency band, the maximum amplitude value of the medium frequency band, the maximum amplitude value of the high frequency band, and the maximum amplitude value of the full frequency band corresponding to each liquid flow includes:
obtaining a first relational expression according to the maximum amplitude value of the low frequency band corresponding to the liquid flow; obtaining a second relational expression according to the maximum amplitude value of the intermediate frequency range corresponding to the liquid flow; obtaining a third relation according to the maximum amplitude value of the high-frequency band corresponding to the liquid flow; obtaining a fourth relational expression according to the maximum amplitude value of the full frequency band corresponding to the liquid flow; and determining a functional relation between the liquid flow of the calibration fluid and the measurement signal from the first relation, the second relation, the third relation and the fourth relation according to the correlation.
Optionally, the obtaining a signal flow relationship according to the functional relationship corresponding to the calibration fluid includes:
according to the preset proportion, adjusting the water content proportion of the scale fluid; respectively obtaining the corresponding functional relation of the scale fluids with various water proportions; and obtaining a signal flow relation according to the functional relation corresponding to the preset proportion and the functional relations corresponding to the multiple water-containing proportions.
Optionally, the adjusting the water content ratio of the scale fluid according to the preset ratio includes:
according to the preset proportion, gradually reducing the water content proportion; wherein the preset proportion is 100%.
In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a downhole fluid measurement model acquisition device, comprising:
the signal acquisition module is used for adjusting the liquid flow of the calibration fluid in the flow simulation shaft and recording measurement signals of different liquid flows measured by the noise logging instrument; wherein the calibration fluid contains water in a preset proportion; the first relation acquisition module is used for acquiring a functional relation between the liquid flow of the scale fluid and the measurement signal according to the measurement signal; the second relation acquisition module is used for acquiring a signal flow relation according to the functional relation corresponding to the calibration fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
In a third aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a method for obtaining a downhole fluid measurement model is applied to a measurement system, wherein the measurement system comprises a noise logging instrument, a ground recording system, a flow simulation wellbore, a scale fluid storage and separation system and a standard flow metering system; the noise logging instrument is placed in the flow simulation shaft and is connected with the ground recording system through a cable; the flow simulation well bore is connected with the calibration fluid storage and separation system through a pipeline, the calibration fluid storage and separation system is connected with the standard flow metering system through a pipeline, and the standard flow metering system is connected with the flow simulation well bore through a pipeline; the method comprises the following steps: starting a calibration fluid storage separation system to enable calibration fluid to fill the flow simulation well bore; wherein the calibration fluid contains water in a preset proportion; adjusting the liquid flow in the flow simulation well bore through the standard flow metering system, and recording measurement signals under different liquid flows through the noise logging instrument and the ground recording system; according to the measuring signal, obtaining a functional relation between the liquid flow of the scale fluid and the measuring signal; obtaining a signal flow relation according to the function relation corresponding to the calibration fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
According to the method and the device for acquiring the underground fluid measurement model, provided by the embodiment of the invention, the liquid flow of the calibration fluid in the shaft is simulated by adjusting the flow, and measurement signals under different liquid flows measured by a noise logging instrument are recorded; the calibration fluid contains water in a preset proportion, so that the viscosity of the downhole liquid can be simulated really; then, according to the measuring signals, respectively obtaining the functional relation between each liquid flow and the corresponding measuring signal, wherein the functional relation can express the relation between different liquid flow states of the scale liquid and the noise signals; and finally, obtaining a signal flow relation according to the function relation corresponding to the scale fluid, and realizing the construction of a signal flow relation model. The finally determined signal flow relation can be used for determining the flow of the underground fluid, when the noise logging instrument acquires the underground signal, the flow of the underground fluid can be determined, real-time quantitative measurement can be realized, and the application range of the noise logging instrument is effectively enlarged.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 is a flow chart illustrating a downhole fluid measurement model acquisition method according to a first embodiment of the present invention;
FIG. 2 shows a schematic configuration of a measuring system in a first embodiment of the invention;
FIG. 3 shows a spectrogram in a first embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a downhole fluid measurement model acquisition device according to a second embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First embodiment
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for obtaining a downhole fluid measurement model according to a first embodiment of the present invention. The method for acquiring the downhole fluid measurement model comprises the following steps:
step S10: adjusting the liquid flow of the calibration fluid in the flow simulation well shaft, and recording measurement signals of different liquid flows measured by a noise logging instrument; wherein the scale fluid contains water in a preset proportion;
step S20: respectively obtaining a functional relation between each liquid flow and the corresponding measuring signal according to the measuring signals;
step S30: obtaining a signal flow relation according to the function relation corresponding to the calibration fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
As shown in fig. 2, in order to facilitate the implementation of the above method, in this embodiment, a set of experimental measurement systems 10 is further designed, where the measurement system 10 includes a noise logging tool 4, a surface recording system 1, a flow simulation wellbore 3, a calibration fluid storage and separation system 6, and a standard flow metering system 8; the noise logging instrument 4 is placed in the flow simulation well shaft 3 and is connected with the ground recording system 1 through a cable 2; the noise tool 4 may be used to measure signals generated by the flow of the calibration fluid 5 in the flow simulation wellbore 3 and received and recorded by the surface recording system 1. The flow simulation well shaft 3 is connected with a calibration fluid storage and separation system 6 through a pipeline 7, and the water content proportion in the fluid can be adjusted through the calibration fluid storage and separation system 6. Further, the calibration fluid storage separation system 6 is connected with a standard flow metering system 8 through a pipeline 7, the standard flow metering system 8 is connected with the flow simulation well shaft 3 through the pipeline 7, and the liquid flow of the calibration fluid 5 can be adjusted and controlled through the standard flow metering system 8. The flow simulation well bore 3, the calibration fluid storage and separation system 6 and the standard flow metering system 8 are connected through a pipeline 7 to form a circulating system, so that the calibration fluid 5 can continuously flow in the flow simulation well bore 3. The calibration fluid 5 is used to simulate the flow of liquid downhole, in this embodiment the ratio of diesel and water is used to vary the viscosity of the simulated liquid. When using the above-described measurement system 10, the method may be implemented as:
step S10', a scale fluid storage and separation system is started to enable the scale fluid to fill the flow simulation well bore; wherein the calibration fluid contains water in a preset proportion;
s20' adjusting the liquid flow in the flow simulation well shaft through the standard flow metering system, and recording measurement signals under different liquid flows through the noise logging instrument and the ground recording system;
step S30' respectively obtaining a functional relation between each liquid flow and the corresponding measuring signal according to the measuring signal;
step S40' obtaining a signal flow relation according to the functional relation corresponding to the calibration fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
In this embodiment, the steps S10 to S30 will be described in detail, and the steps S10 to S40' can be understood by referring to the description of the steps S10 to S30, and will not be described again.
Before step S10 is performed, the calibration fluid storage and separation system may be activated to fill the calibration fluid into the flow simulation wellbore. After the calibration fluid is full, the calibration fluid can be kept still for a period of time to ensure that the liquid flow of the calibration fluid in the flow simulation well bore is stable, and the measurement is prevented from being interfered. For example, the resting time may be 4min, 5min, 10min, and so forth.
Step S10: adjusting the liquid flow of the calibration fluid in the flow simulation well shaft, and recording measurement signals of different liquid flows measured by a noise logging instrument; wherein the calibration fluid contains water in a preset proportion.
In step S10, for the same calibration fluid, it is necessary to measure the noise signals generated by the calibration fluid under different liquid flow rates for a plurality of times. The liquid flow of the calibration fluid can be measured from zero at the time of specific measurement, and the size of the liquid flow is gradually increased after the measurement is completed. After each increment, measurement is carried out to obtain a measurement signal under the liquid flow.
In this embodiment, the flow rate should be maintained for a preset time after the adjustment of the flow rate. Therefore, when the noise signal generated by the calibration fluid is measured, the measurement signal of the calibration fluid in a stable body with a certain liquid flow can be obtained, and the accuracy is improved. The preset time can be 5min, 10min and 15min, and can also be any value greater than or equal to 10min. Furthermore, the noise logging instrument has lower sensitivity when the flow rate of the calibration fluid is low, and can adopt smaller adjustment step length to adjust the liquid flow rate when the liquid flow rate of the calibration fluid is low, so that inaccuracy of one or more acquired measurement signals can be avoided when the flow rate of the liquid is low. When the liquid flow is high, the liquid flow can be adjusted by adopting a large adjustment step length, and the efficiency is improved. I.e. the larger the liquid flow, the larger the adjustment step.
For example, the flow rate in this embodiment may be 0m 3 /d、5m 3 /d、10m 3 /d、50m 3 /d、100m 3 /d、150m 3 D increasing the liquid flow successively, wherein 3 And/d "means" cubic meter per day ". That is, the noise logging instrument will respectively obtain the liquid flow of 0m 3 /d、5m 3 /d、10m 3 /d、50m 3 /d、100m 3 D and 150m 3 Measurement signal at/d.
Step S20: and respectively obtaining the functional relation between each liquid flow and the corresponding measuring signal according to the measuring signals.
In step S20, the measurement signal is measured by the noise logging tool and then transmitted to a surface recording system for recording. The process of obtaining the functional relationship is as follows:
step S21: and obtaining a spectrogram according to the measuring signal.
In step S21, the measurement signal may be presented as a noise profile in the surface recording system, and may be plotted as a spectrogram based on the noise profile.
Step S22: and respectively obtaining the maximum amplitude value of the low frequency band, the maximum amplitude value of the medium frequency band, the maximum amplitude value of the high frequency band and the maximum amplitude value of the full frequency band corresponding to each liquid flow according to the spectrogram. When all the measurements of the different liquid flows are completed, a spectrogram as shown in fig. 3 can be obtained.
In step S22, the spectrogram is divided into low frequency, intermediate frequency, high frequency, and full frequency, which is beneficial to determining a more accurate functional relationship with a higher resolution for the actual detection situation. The maximum amplitude value may be an average value, for example, the maximum amplitude value of the low frequency band corresponding to a certain liquid flow rate is: average value of all maximum amplitude values in the low frequency band within the preset time length, and so on.
Step S23: and respectively obtaining the functional relation corresponding to each liquid flow according to the maximum amplitude value of the low frequency band, the maximum amplitude value of the medium frequency band, the maximum amplitude value of the high frequency band and the maximum amplitude value of the full frequency band corresponding to each liquid flow.
In step S23, the maximum amplitude value of the low frequency band, the maximum amplitude value of the middle frequency band, the maximum amplitude value of the high frequency band, and the maximum amplitude value of the full frequency band may be processed separately as follows:
obtaining a first relational expression according to the maximum amplitude value of the low frequency band corresponding to the liquid flow; obtaining a second relational expression according to the maximum amplitude value of the intermediate frequency band corresponding to the liquid flow; obtaining a third relation according to the maximum amplitude value of the high frequency band corresponding to the liquid flow; obtaining a fourth relational expression according to the maximum amplitude value of the full frequency band corresponding to the liquid flow; that is, for the same calibration fluid, there are 4 relations, and the 4 relations can represent the functional relationship between the liquid flow rate and the maximum amplitude of the fluid. The relation in 4 can be obtained by fitting. And finally, according to the correlation, determining the relation with the best correlation from the first relation, the second relation, the third relation and the fourth relation as the function relation corresponding to the calibration fluid. In this embodiment, the good correlation represents a mathematical relationship between the liquid flow rate and the maximum amplitude value, such as a linear relationship, a quadratic function relationship, a polynomial relationship, and the like. Therefore, reliability is provided, and the obtained relational expression can be used for reflecting the flow condition of underground real measurement; otherwise, the measurement condition is a discrete relation, and the reliability is not provided, so that the measurement condition outside the experiment cannot be fed back.
Step S30: obtaining a signal flow relation according to the functional relation corresponding to the scale fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
In step S30, in order to ensure that the constructed signal flow relationship has good integrity, in this embodiment, calibration fluids with different viscosities are measured. After step S20 is completed, the viscosity of the scale fluid is adjusted, i.e., the water content ratio in the scale fluid is adjusted. The adjustment can be performed successively based on the above-mentioned predetermined ratio, and if the predetermined ratio is 100%, the reduction can be performed successively based on 100%. The proportion of each reduction is determined to the accuracy required by the experiment, and may be determined to be 10% in the present embodiment. Further, 15%, 8%, 5%, 4%, etc. may be used without limitation.
Then, after the water content ratio is adjusted once, the corresponding functional relationship can be obtained for the new scale fluid, and the obtaining mode is the same as the steps S10 to S20, and is not described again. Therefore, the corresponding functional relation of the calibration fluid with various water proportions can be obtained. If the adjustment step size of the moisture content ratio is 10%, the functional relationship including the preset ratio is 11 in total. Further, since the 11 functional relationships cannot cover the liquid flow rates of all viscosity situations, interpolation can be performed based on the 11 functional relationships to obtain the functional relationships of the calibration fluids with other water content ratios. All of the functional relationships may constitute signal flow relationships for downhole measurements made by the noise logging tool. When the noise logging instrument measures the underground liquid, the real-time flow of the underground liquid can be obtained in real time based on the signal flow relation, and the noise logging instrument is high in accuracy and good in timeliness.
In summary, in the method for obtaining a downhole fluid measurement model provided in this embodiment, the liquid flow of the calibration fluid in the wellbore is simulated by adjusting the flow, and measurement signals at different liquid flows measured by the noise logging tool are recorded; the calibration fluid contains water in a preset proportion, and the viscosity of the downhole fluid can be truly simulated; then, according to the measuring signals, respectively obtaining the functional relation between each liquid flow and the corresponding measuring signal, wherein the functional relation can express the relation between different liquid flow states of the scale liquid and noise signals; and finally, obtaining a signal flow relation according to the functional relation corresponding to the scale fluid, and realizing the construction of a signal flow relation model. The finally determined signal flow relation can be used for determining the flow of the underground fluid, when the noise logging instrument acquires the underground signal, the flow of the underground fluid can be determined, real-time quantitative measurement can be realized, and the application range of the noise logging instrument is effectively enlarged.
Second embodiment
Referring to fig. 4, based on the same inventive concept, a second embodiment of the present invention provides a downhole fluid measurement model obtaining apparatus 300, where the downhole fluid measurement model obtaining apparatus 300 includes:
the signal acquisition module 301 is configured to adjust the liquid flow rate of the calibration fluid in the flow simulation wellbore, and record measurement signals of different liquid flow rates measured by the noise logging instrument; wherein the calibration fluid contains water in a preset proportion;
a first relation obtaining module 302, configured to obtain, according to the measurement signals, a functional relation between each of the liquid flow rates and the corresponding measurement signal;
a second relation obtaining module 303, configured to obtain a signal flow relation according to the functional relation corresponding to the scale fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
As an optional implementation manner, the signal obtaining module 301 is specifically configured to:
gradually increasing the liquid flow in the flow simulation well bore from zero; and maintaining the preset time length after each increase, wherein the larger the liquid flow is, the larger the adjustment step length is.
As an optional implementation manner, the signal obtaining module 301 is specifically configured to:
according to the flow size of 0m 3 /d、5m 3 /d、10m 3 /d、50m 3 /d、100m 3 /d、150m 3 D increasing the liquid flow rate.
As an optional embodiment, the preset time period is greater than or equal to 10min.
As an optional implementation manner, the first relationship obtaining module 302 is specifically configured to:
obtaining a spectrogram according to the measuring signal; respectively obtaining the maximum amplitude value of a low frequency band, the maximum amplitude value of a medium frequency band, the maximum amplitude value of a high frequency band and the maximum amplitude value of a full frequency band corresponding to each liquid flow according to the spectrogram; and obtaining a functional relation between the liquid flow of the scale fluid and the measurement signal according to the maximum amplitude value of the low frequency band, the maximum amplitude value of the medium frequency band, the maximum amplitude value of the high frequency band and the maximum amplitude value of the full frequency band corresponding to each liquid flow.
As an optional implementation manner, the first relationship obtaining module 302 is specifically configured to:
obtaining a first relational expression according to the maximum amplitude value of the low frequency band corresponding to the liquid flow; obtaining a second relational expression according to the maximum amplitude value of the intermediate frequency range corresponding to the liquid flow; obtaining a third relation according to the maximum amplitude value of the high-frequency band corresponding to the liquid flow; obtaining a fourth relational expression according to the maximum amplitude value of the full frequency band corresponding to the liquid flow; and determining a functional relation between the liquid flow of the calibration fluid and the measurement signal from the first relation, the second relation, the third relation and the fourth relation according to the correlation.
As an optional implementation manner, the second relationship obtaining module 303 is specifically configured to:
adjusting the water content ratio of the scale fluid according to the preset ratio; respectively obtaining the corresponding functional relations of the calibration fluids with various water proportions; and obtaining a signal flow relation according to the functional relation corresponding to the preset proportion and the functional relation corresponding to the various water-containing proportions.
As an optional implementation manner, the second relationship obtaining module 303 is specifically configured to:
according to the preset proportion, gradually reducing the water content proportion; wherein the preset proportion is 100%.
It should be noted that the implementation and technical effects of the downhole fluid measurement model obtaining apparatus 300 provided by the embodiment of the present invention are the same as those of the foregoing method embodiment, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiment to the point that no part of the embodiment of the apparatus is mentioned.
The term "and/or" appearing herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of obtaining a downhole fluid measurement model, comprising:
adjusting the liquid flow of the calibration fluid in the flow simulation well shaft, and recording measurement signals of different liquid flows measured by a noise logging instrument; wherein the calibration fluid contains water in a preset proportion;
according to the measuring signal, obtaining a functional relation between the liquid flow of the calibration fluid and the measuring signal;
obtaining a signal flow relation according to the functional relation corresponding to the scale fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
2. The method of claim 1, wherein the adjusting the flow rate simulates a liquid flow rate of a calibration fluid in a wellbore, comprising:
gradually increasing the liquid flow in the flow simulation well bore from zero; and maintaining the preset time length after each increase, wherein the larger the liquid flow is, the larger the adjustment step length is.
3. The method of claim 2, wherein the gradually increasing the flow rate of the fluid in the flow simulation wellbore from scratch comprises:
according to the flow size of 0m 3 /d、5m 3 /d、10m 3 /d、50m 3 /d、100m 3 /d、150m 3 D increasing the liquid flow rate.
4. The method of claim 2, wherein the preset duration is greater than or equal to 10min.
5. The method of claim 1, wherein obtaining a functional relationship between the liquid flow rate of the calibration fluid and the measurement signal based on the measurement signal comprises:
obtaining a spectrogram according to the measuring signal;
respectively obtaining a maximum amplitude value of a low frequency band, a maximum amplitude value of a medium frequency band, a maximum amplitude value of a high frequency band and a maximum amplitude value of a full frequency band corresponding to each liquid flow according to the spectrogram;
and obtaining a functional relation between the liquid flow of the scale fluid and the measurement signal according to the maximum amplitude value of the low frequency band, the maximum amplitude value of the medium frequency band, the maximum amplitude value of the high frequency band and the maximum amplitude value of the full frequency band corresponding to each liquid flow.
6. The method according to claim 5, wherein the obtaining the functional relationship between each of the liquid flow rates and the corresponding measurement signal respectively for the maximum amplitude value in the low frequency band, the maximum amplitude value in the medium frequency band, the maximum amplitude value in the high frequency band, and the maximum amplitude value in the full frequency band corresponding to each of the liquid flow rates comprises:
obtaining a first relational expression according to the maximum amplitude value of the low frequency band corresponding to the liquid flow;
obtaining a second relational expression according to the maximum amplitude value of the intermediate frequency range corresponding to the liquid flow;
obtaining a third relation according to the maximum amplitude value of the high-frequency band corresponding to the liquid flow;
obtaining a fourth relational expression according to the maximum amplitude value of the full frequency band corresponding to the liquid flow;
and determining a functional relation between the liquid flow of the calibration fluid and the measurement signal from the first relation, the second relation, the third relation and the fourth relation according to the correlation.
7. The method of claim 1, wherein obtaining a signal flow relationship from the functional relationship corresponding to the calibration fluid comprises:
according to the preset proportion, adjusting the water content proportion of the scale fluid;
respectively obtaining the corresponding functional relation of the scale fluids with various water proportions;
and obtaining a signal flow relation according to the functional relation corresponding to the preset proportion and the functional relations corresponding to the multiple water-containing proportions.
8. The method according to claim 7, wherein the adjusting the water content ratio of the calibration fluid according to the preset ratio comprises:
according to the preset proportion, gradually reducing the water content proportion; wherein the preset proportion is 100%.
9. A downhole fluid measurement model acquisition device, comprising:
the signal acquisition module is used for adjusting the liquid flow of the calibration fluid in the flow simulation shaft and recording measurement signals of different liquid flows measured by the noise logging instrument; wherein the scale fluid contains water in a preset proportion;
the first relation acquisition module is used for acquiring a functional relation between the liquid flow of the scale fluid and the measurement signal according to the measurement signal;
the second relation acquisition module is used for acquiring a signal flow relation according to the functional relation corresponding to the scale fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
10. A method for obtaining a downhole fluid measurement model is characterized by being applied to a measurement system, wherein the measurement system comprises a noise logging instrument, a ground recording system, a flow simulation shaft, a calibration fluid storage and separation system and a standard flow metering system; the noise logging instrument is placed in the flow simulation shaft and is connected with the ground recording system through a cable; the flow simulation well bore is connected with the calibration fluid storage and separation system through a pipeline, the calibration fluid storage and separation system is connected with the standard flow metering system through a pipeline, and the standard flow metering system is connected with the flow simulation well bore through a pipeline; the method comprises the following steps:
starting a calibration fluid storage separation system to enable calibration fluid to fill the flow simulation well bore; wherein the calibration fluid contains water in a preset proportion;
adjusting the liquid flow in the flow simulation well bore through the standard flow metering system, and recording measurement signals under different liquid flows through the noise logging instrument and the ground recording system;
according to the measuring signal, obtaining a functional relation between the liquid flow of the calibration fluid and the measuring signal;
obtaining a signal flow relation according to the functional relation corresponding to the scale fluid; wherein the signal flow relationship is used to determine a flow rate of a downhole fluid.
Priority Applications (1)
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