CN117148430B - Shale oil fracturing microseism monitoring method - Google Patents
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 113
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- 239000003079 shale oil Substances 0.000 title claims abstract description 91
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/288—Event detection in seismic signals, e.g. microseismics
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- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
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Abstract
The invention relates to the technical field of petroleum exploitation, in particular to a shale oil fracturing microseism monitoring method, which comprises the following steps of S1, finishing the layout of detectors; s2, shale oil fracturing construction is carried out, and seismic waves collected by each wave detector at the construction stage are transmitted to a central control module; and S3, calculating the simulated daily output after fracturing by the central control module, judging whether the monitoring in the shale oil fracturing process meets the preset standard according to the difference between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing, determining a secondary judging mode for judging whether the monitoring in the shale oil fracturing process meets the preset standard according to the pressure difference when the monitoring does not meet the preset standard, or increasing the particle size of the supporting particles in the fracturing agent used in the next fracturing process to a corresponding value according to the difference between the daily output difference and the second preset daily output difference, and judging that the monitoring in the shale oil fracturing process is invalid, thereby improving the effectiveness and the accuracy of the monitoring.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to a shale oil fracturing microseism monitoring method.
Background
The fracturing method is also called as hydraulic fracturing method, which is characterized by firstly taking a section of exposed drilling hole of bedrock, sealing the upper end and the lower end by using a packer, then injecting liquid, pressurizing until the hole wall breaks, recording the change of pressure along with time, and observing the breaking position by using a die or a downhole television.
The microseism monitoring technology is used for further explaining the azimuth and the morphology of the crack by monitoring the microseism distribution, so that the aims of evaluating the fracturing effect and guiding the fracturing construction are achieved. The microseism monitoring has very important guiding significance on the optimization design of fracturing construction, the reasonable layout of integral development, the correct arrangement of water injection well patterns and the efficient exploitation of oil and gas resources of low-permeability oil and gas fields.
Chinese patent publication No.: CN106054239B discloses a microseism fracturing monitoring and observing method, which comprises the following steps: (A) Acquiring the existing seismic data of a work area, and establishing a geological model; (B) Determining the position and the stage number of a detector of a deep well microseism observation system which is sunk in a monitoring well based on the existing seismic data of the work area and the geological model; (C) Determining a target well section related to a target layer observed by using the ground micro-seismic observation system according to the sinking position of a detector of the deep well micro-seismic observation system; (D) And determining the position of a detector of the ground micro-seismic observation system aiming at the target well section. It can be seen that the above technical solution does not verify or validate the monitored result, resulting in a larger deviation of the monitored result.
Disclosure of Invention
Therefore, the invention provides a shale oil fracturing microseism monitoring method which is used for overcoming the defect that the monitoring result is not checked or verified in the prior art, so that larger deviation occurs in the monitoring result.
In order to achieve the above purpose, the invention provides a shale oil fracturing microseism monitoring method, which comprises the following steps:
s1, taking an oil well outlet as an origin and arranging a plurality of groups of detectors at equal intervals along the azimuth of a shale oil horizontal well, wherein for a single group of detectors, the single group of detectors comprise a plurality of detectors which are arranged at equal intervals along the vertical direction of the shale oil horizontal well;
s2, shale oil fracturing construction is carried out, seismic waves collected by each detector in a construction stage are transmitted to a central control module, and aiming at a single detector, the central control module judges the grade of a seismic event and the times of the seismic event according to the seismic waves returned by the single detector;
and S3, calculating simulated daily output after fracturing according to the grade of the seismic event and the times of the seismic event acquired by each detector by the central control module, judging whether monitoring in the shale oil fracturing process meets a preset standard according to the difference value between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing, determining a secondary judging mode for judging whether monitoring in the shale oil fracturing process meets the preset standard according to the pressure difference value when the monitoring does not meet the preset standard, or increasing the particle size of supporting particles in a fracturing agent used in the next fracturing process to a corresponding value according to the difference value between the daily output difference value and the second preset daily output difference value, and judging that monitoring in the shale oil fracturing process is invalid.
Further, in the step S3, the central control module calculates the post-fracturing simulated daily output D according to the grade of the seismic event and the number of times of the seismic event acquired by each detector, and setsWhere α is an evaluation coefficient, α=0.51, ni is a level of the ith seismic event monitored by the jth detector, i=1, 2,3,..1,2,3,..m, m is the total number of detectors deployed.
Further, the central control module calculates the difference between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing under a first preset condition, and the central control module determines a judging mode for judging whether monitoring in the shale oil fracturing process accords with a preset standard or not according to the obtained daily output difference,
the first judging mode is that the central control module judges that monitoring in the shale oil fracturing process meets a preset standard, and monitoring in the next shale oil fracturing process is completed according to a current monitoring method; the first judging mode meets the condition that the daily output difference is smaller than a first preset daily output difference;
the second judging mode is a secondary judging mode that the monitoring in the shale oil fracturing process does not accord with a preset standard, the central control module further controls the detection module to detect the pressure of the oil well after fracturing, the central control module calculates the difference between the pressure and the preset pressure according to the detected pressure and records the difference as a pressure difference, and the central control module determines whether the monitoring in the shale oil fracturing process accords with the preset standard or not according to the pressure difference; the second judging mode meets the condition that the daily output difference is larger than or equal to the first preset daily output difference and smaller than a second preset daily output difference;
the third judging mode is that the central control module judges that the reason that the monitoring in the shale oil fracturing process does not meet the preset standard and does not meet the preset standard is that the crack closure rate after fracturing is high, and the adjusting module increases the particle size of supporting particles in the fracturing agent used in the next fracturing process to a corresponding value according to the difference between the daily yield difference and the second preset daily yield difference; the third judging mode meets the condition that the daily output difference is larger than or equal to the second preset daily output difference and smaller than a third preset daily output difference;
the fourth judging mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard and the reason that the monitoring in the shale oil fracturing process does not meet the preset standard is that non-fracturing vibration exists in the fracturing process, and the central control module judges that monitoring in the shale oil fracturing process is invalid; the fourth judging mode meets the condition that the daily output difference value is larger than or equal to the third preset daily output difference value;
and the first preset condition is that the central control module finishes calculation of the simulated daily output after fracturing.
Further, the central control module calculates the difference between the daily output difference and the second preset daily output difference in the third judging mode and marks the difference as a supporting difference, and the adjusting module determines an adjusting mode for the particle size of the supporting particles in the fracturing agent according to the supporting difference, wherein,
the first particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a first preset particle size adjusting coefficient; the first particle size adjustment mode meets the condition that the support difference value is smaller than a first preset support difference value;
the second particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a second preset particle size adjusting coefficient; the second particle size adjustment mode meets the requirement that the support difference value is larger than or equal to the first preset support difference value and smaller than a second preset support difference value;
the third particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a third preset particle size adjusting coefficient; the third particle size adjusting mode meets the requirement that the support difference value is larger than or equal to the second preset support difference value.
Further, the central control module calculates the difference between the regulated sedimentation velocity of the fracturing agent and the preset sedimentation velocity under a second preset condition and marks the difference as a corrected difference, and the regulating module determines a correction mode for the particle size of the supporting particles in the fracturing agent according to the corrected difference, wherein,
the first correction mode is that the adjustment module uses a first preset correction coefficient to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the first correction mode meets the condition that the correction difference value is smaller than a first preset correction difference value;
the second correction mode is that the adjusting module uses a second preset correction coefficient to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the second correction mode meets the condition that the correction difference value is larger than or equal to the first preset correction difference value and smaller than a second preset correction difference value;
the third correction mode is that the adjustment module uses a third preset correction coefficient to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
the second preset condition is that the adjustment module completes adjustment of the particle size of the supporting particles in the fracturing agent and the sedimentation speed of the fracturing agent after adjustment is larger than a preset sedimentation speed.
Further, the central control module controls the detection module to detect the pressure of the oil well after fracturing in the second judging mode, the central control module calculates the difference between the pressure and the preset pressure according to the detected pressure and marks the difference as a pressure difference, the central control module determines whether monitoring in the shale oil fracturing process accords with a secondary judging mode of a preset standard according to the pressure difference, wherein,
the first secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process meets a preset standard, and monitoring in the next shale oil fracturing process is completed according to a current monitoring method; the first secondary judgment mode meets the condition that the pressure difference value is smaller than a first preset pressure difference value;
the second secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, and the central control module reduces the arrangement interval of the single group of detectors to a corresponding value according to the difference value between the pressure difference value and the first preset pressure difference value; the second secondary judgment mode meets the condition that the pressure difference value is larger than or equal to the first preset pressure difference value and smaller than a second preset pressure difference value;
the third secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, and the central control module increases the amplitude of the seismic waves detected by the detectors to a corresponding value according to the difference between the pressure difference and the second preset pressure difference; the third secondary judgment mode meets the condition that the pressure difference value is larger than or equal to the second preset pressure difference value.
Further, the central control module calculates a difference between the pressure difference and the second preset pressure difference in the third secondary judgment mode and marks the difference as an amplitude difference, and the adjustment module determines an adjustment mode for the amplitude of the seismic waves detected by the detector according to the amplitude difference, wherein
The first amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a first preset amplitude adjustment coefficient; the first amplitude adjustment mode meets the condition that the amplitude difference value is smaller than a first preset amplitude difference value;
the second amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a second preset amplitude adjustment coefficient; the second amplitude adjustment mode meets the condition that the amplitude difference value is larger than or equal to the first preset amplitude difference value and smaller than a second preset amplitude difference value;
the third amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a third preset amplitude adjustment coefficient; the third amplitude adjustment mode satisfies that the amplitude difference value is greater than or equal to the second preset amplitude difference value.
Further, the central control module calculates the difference between the pressure difference and the first preset pressure difference in the second secondary judgment mode and marks the difference as a distance difference, and the adjusting module determines an adjusting mode of the arrangement distance of the detectors for a single group according to the distance difference, wherein,
the first interval adjusting mode is that the adjusting module uses a first preset interval adjusting coefficient to reduce the arrangement interval of the single group of detectors to a corresponding value; the first interval adjustment mode meets the condition that the interval difference value is smaller than a first preset interval difference value;
the second interval adjusting mode is that the adjusting module uses a second preset interval adjusting coefficient to reduce the arrangement interval of the single group of detectors to a corresponding value; the second interval adjusting mode meets the condition that the interval difference value is larger than or equal to the first preset interval difference value and smaller than a second preset interval difference value;
the third interval adjusting mode is that the adjusting module uses a third preset interval adjusting coefficient to reduce the arrangement interval of the single group of detectors to a corresponding value; the third interval adjusting mode meets the condition that the interval difference value is larger than or equal to the second preset interval difference value.
Further, the central control module determines a determination mode for the grade of the seismic event according to the amplitude of the peak value in the seismic wave monitored by the detector under a third preset condition, wherein,
the first grade judging mode is that the central control module judges the grade of the seismic event as one grade; the first level judgment mode meets the condition that the amplitude of a peak value in the seismic wave is larger than or equal to a first preset amplitude and smaller than a second preset amplitude;
the second grade judging mode is that the central control module judges that the grade of the seismic event is two grades; the second level judgment mode meets the condition that the amplitude of the peak value in the seismic wave is larger than or equal to the second preset amplitude and smaller than a third preset amplitude;
the third grade judging mode is that the central control module judges that the grade of the seismic event is three grades; the third level judgment mode meets the condition that the amplitude of the peak value in the seismic wave is larger than or equal to the third preset amplitude and smaller than the fourth preset amplitude.
Further, the sensitivity of the detector is 190v/m/s-210v/m/s.
Compared with the prior art, the method has the beneficial effects that the method can be rapidly and efficiently arranged by arranging the detectors on the ground surface, the seismic waves are collected in the fracturing construction process and transmitted to the central control module, the central control module obtains the simulated daily output representing the fracturing effect after counting the grade and the times of the seismic waves, and whether the monitoring in the shale oil fracturing process meets the preset standard is judged according to the difference between the actual daily output and the simulated daily output after fracturing, so that the effectiveness and the accuracy of the monitoring are improved.
Furthermore, the invention calculates the simulated daily output after fracturing according to the grade of the seismic event collected by the detector and the times of the seismic event, thereby scientifically and accurately representing the evaluation standard of single monitoring.
Further, according to the method, whether monitoring in the shale oil fracturing process meets the preset standard is judged according to the difference between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing, a secondary judgment mode for judging whether the monitoring in the shale oil fracturing process meets the preset standard is determined according to the pressure difference when the monitoring does not meet the preset standard, or the particle size of supporting particles in a fracturing agent used in the next fracturing process is increased to a corresponding value according to the difference between the daily output difference and the second preset daily output difference, and the monitoring in the shale oil fracturing process is judged to be invalid, so that the processing means for accurately judging that the monitoring does not meet the preset standard are judged.
Further, when the central control module judges that the monitoring in the shale oil fracturing process does not meet the preset standard and the reason that the monitoring does not meet the preset standard is that the crack closure rate after fracturing is high, the seismic state represented in the monitoring process is qualified, but the actual oil production is smaller due to the fact that the crack closure rate after construction is high, the particle size of supporting particles in the fracturing agent is increased to a corresponding value by the adjusting module, and therefore the problem of inaccurate monitoring caused by the fact that the crack closure rate after fracturing is high is solved.
Further, when the adjusting module completes adjustment of the particle size of the supporting particles in the fracturing agent and the sedimentation speed of the fracturing agent after adjustment is larger than the preset sedimentation speed, the sedimentation speed of the fracturing agent is further ensured on the basis of ensuring the particle size by correcting the particle size of the supporting particles.
Further, the method and the device realize accurate judgment of whether the monitoring meets the standard by detecting the pressure of the oil well after fracturing and determining whether the monitoring meets the secondary judgment mode of the preset standard in the shale oil fracturing process according to the pressure difference value.
Furthermore, the amplitude of the seismic wave detected by the detector is regulated to a corresponding value, so that the attenuation of the seismic wave caused by the soil layer is solved, and the monitoring accuracy is improved.
Further, when the precision of detection is due to unreasonable arrangement of detectors, the adjusting module reduces the arrangement interval of the detectors of a single group according to the interval difference value, so that the monitoring precision is improved.
Furthermore, the invention marks the grade of the earthquake event through the amplitude, thereby accurately distinguishing the grade of the earthquake event and being convenient for realizing the accurate statistics of the earthquake.
Drawings
FIG. 1 is a flow chart of a shale oil fracturing microseism monitoring method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining whether monitoring meets a preset standard in a shale oil fracturing process according to an embodiment of the invention;
FIG. 3 is a flow chart of a manner of adjusting the particle size of support particles in a fracturing agent according to an embodiment of the present invention;
fig. 4 is a flowchart of a secondary determination method for monitoring whether a preset standard is met in the shale oil fracturing process according to an embodiment of the invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that, the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical detection data and the corresponding historical detection results of the first half year of the current monitoring by the central control module.
According to the invention, the central control module comprehensively determines the numerical value of each preset parameter standard aiming at the current monitoring according to the parameter in 12477 times of fracturing construction and the parameter of the oil well after fracturing which are cumulatively monitored in the first six months before the current monitoring. It will be understood by those skilled in the art that the determination manner of the system according to the present invention for the parameters mentioned above may be that the value with the highest duty ratio is selected as the preset standard parameter according to the data distribution, the weighted summation is used to take the obtained value as the preset standard parameter, each history data is substituted into a specific formula, and the value obtained by using the formula is taken as the preset standard parameter or other selection manner, as long as different specific conditions in the single item determination process can be definitely defined by the obtained value by the system according to the present invention are satisfied.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1, fig. 2, fig. 3, and fig. 4, flowcharts of a shale oil fracturing microseism monitoring method according to an embodiment of the invention are shown; the embodiment of the invention provides a flow chart of a judging mode for monitoring whether the shale oil fracturing process accords with a preset standard or not; the embodiment of the invention provides a flow chart of a mode of adjusting the particle size of support particles in the fracturing agent; the embodiment of the invention provides a flow chart of a secondary judgment mode for monitoring whether the shale oil fracturing process accords with a preset standard.
The embodiment of the invention discloses a shale oil fracturing microseism monitoring method, which comprises the following steps:
s1, taking an oil well outlet as an origin and arranging a plurality of groups of detectors at equal intervals along the azimuth of a shale oil horizontal well, wherein for a single group of detectors, the single group of detectors comprise a plurality of detectors which are arranged at equal intervals along the vertical direction of the shale oil horizontal well;
s2, shale oil fracturing construction is carried out, seismic waves collected by each detector in a construction stage are transmitted to a central control module, and aiming at a single detector, the central control module judges the grade of a seismic event and the times of the seismic event according to the seismic waves returned by the single detector;
and S3, calculating simulated daily output after fracturing according to the grade of the seismic event and the times of the seismic event acquired by each detector by the central control module, judging whether monitoring in the shale oil fracturing process meets a preset standard according to the difference value between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing, determining a secondary judging mode for judging whether monitoring in the shale oil fracturing process meets the preset standard according to the pressure difference value when the monitoring does not meet the preset standard, or increasing the particle size of supporting particles in a fracturing agent used in the next fracturing process to a corresponding value according to the difference value between the daily output difference value and the second preset daily output difference value, and judging that monitoring in the shale oil fracturing process is invalid.
Specifically, in the step S3, the central control module calculates the post-fracturing simulated daily output D according to the grade of the seismic event and the number of times of the seismic event acquired by each detector, and setsWherein α is an evaluation coefficient, α=0.51, ni is a level of an ith seismic event monitored by a jth detector, i=1, 2,3,..n, n is a total number of seismic events monitored by the detectors, j=1, 2,3,..m, m is a total number of detectors arranged.
Specifically, the central control module calculates the difference between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing under a first preset condition, and the central control module determines a judging mode for judging whether monitoring in the shale oil fracturing process accords with a preset standard or not according to the obtained daily output difference,
the first judging mode is that the central control module judges that monitoring in the shale oil fracturing process meets a preset standard, and monitoring in the next shale oil fracturing process is completed according to a current monitoring method; the first judging mode meets the condition that the daily output difference is smaller than a first preset daily output difference by 1.50t;
the second judging mode is a secondary judging mode that the monitoring in the shale oil fracturing process does not accord with a preset standard, the central control module further controls the detection module to detect the pressure of the oil well after fracturing, the central control module calculates the difference between the pressure and the preset pressure according to the detected pressure and records the difference as a pressure difference, and the central control module determines whether the monitoring in the shale oil fracturing process accords with the preset standard or not according to the pressure difference; the second judging mode meets the condition that the daily output difference is more than or equal to the first preset daily output difference and less than a second preset daily output difference by 2.85t;
the third judging mode is that the central control module judges that the reason that the monitoring in the shale oil fracturing process does not meet the preset standard and does not meet the preset standard is that the crack closure rate after fracturing is high, and the adjusting module increases the particle size of supporting particles in the fracturing agent used in the next fracturing process to a corresponding value according to the difference between the daily yield difference and the second preset daily yield difference; the third judging mode meets the condition that the daily output difference is more than or equal to the second preset daily output difference and less than a third preset daily output difference by 4.52t;
the fourth judging mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard and the reason that the monitoring does not meet the preset standard is that non-fracturing vibration exists in the fracturing process, the non-fracturing vibration is vibration caused by non-current pressure construction, the non-fracturing vibration comprises ground construction vibration generated in the fracturing process and earthquake of a non-construction area, and the central control module judges that monitoring in the shale oil fracturing process is invalid; the fourth judging mode meets the condition that the daily output difference value is larger than or equal to the third preset daily output difference value;
and the first preset condition is that the central control module finishes calculation of the simulated daily output after fracturing.
Specifically, the central control module calculates the difference between the daily output difference and the second preset daily output difference in the third judging mode and marks the difference as a supporting difference, and the adjusting module determines an adjusting mode for the particle size of the supporting particles in the fracturing agent according to the supporting difference, wherein,
the first particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a first preset particle size adjusting coefficient of 1.10; the first particle size adjustment mode meets the condition that the support difference value is smaller than a first preset support difference value of 0.37;
the second particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a second preset particle size adjusting coefficient of 1.20; the second particle size adjustment mode meets the requirement that the support difference value is greater than or equal to the first preset support difference value and smaller than a second preset support difference value by 0.86;
the third particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a third preset particle size adjusting coefficient of 1.30; the third particle size adjusting mode meets the requirement that the support difference value is larger than or equal to the second preset support difference value.
Specifically, the central control module calculates the difference between the regulated sedimentation velocity of the fracturing agent and the preset sedimentation velocity of 1.25m/h degree under a second preset condition and marks the difference as a correction difference, and the regulating module determines a correction mode for the particle size of the supporting particles in the fracturing agent according to the correction difference, wherein,
the first correction mode is that the adjustment module uses a first preset correction coefficient of 0.99 to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the first correction mode meets the condition that the correction difference value is smaller than a first preset correction difference value of 0.18;
the second correction mode is that the adjusting module uses a second preset correction coefficient of 0.98 to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the second correction mode meets the condition that the correction difference value is larger than or equal to the first preset correction difference value and smaller than a second preset correction difference value by 0.45;
the third correction mode is that the adjustment module uses a third preset correction coefficient of 0.97 to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
the second preset condition is that the adjustment module completes adjustment of the particle size of the supporting particles in the fracturing agent and the sedimentation speed of the fracturing agent after adjustment is larger than a preset sedimentation speed.
Specifically, the central control module controls the detection module to detect the pressure of the oil well after fracturing in the second judging mode, calculates the difference between the pressure and the preset pressure of 1.20MPa according to the detected pressure and marks the difference as a pressure difference, and determines whether monitoring in the shale oil fracturing process meets a secondary judging mode of a preset standard according to the pressure difference, wherein,
the first secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process meets a preset standard, and monitoring in the next shale oil fracturing process is completed according to a current monitoring method; the first secondary judgment mode meets the condition that the pressure difference is smaller than a first preset pressure difference of 0.08MPa;
the second secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, and the central control module reduces the arrangement interval of the single group of detectors to a corresponding value according to the difference value between the pressure difference value and the first preset pressure difference value; the second secondary judgment mode meets the condition that the pressure difference value is larger than or equal to the first preset pressure difference value and smaller than the second preset pressure difference value by 0.15MPa;
the third secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, and the central control module increases the amplitude of the seismic waves detected by the detectors to a corresponding value according to the difference between the pressure difference and the second preset pressure difference; the third secondary judgment mode meets the condition that the pressure difference value is larger than or equal to the second preset pressure difference value.
Specifically, the central control module calculates a difference between the pressure difference and the second preset pressure difference in the third secondary determination mode, and marks the difference as an amplitude difference, and the adjustment module determines an adjustment mode for the amplitude of the seismic wave detected by the detector according to the amplitude difference, wherein
The first amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a first preset amplitude adjustment coefficient 1.02; the first amplitude adjustment mode meets the condition that the amplitude difference value is smaller than a first preset amplitude difference value of 0.02;
the second amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a second preset amplitude adjustment coefficient 1.05; the second amplitude adjustment mode meets the condition that the amplitude difference value is larger than or equal to the first preset amplitude difference value and smaller than a second preset amplitude difference value by 0.04;
the third amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a third preset amplitude adjustment coefficient 1.08; the third amplitude adjustment mode satisfies that the amplitude difference value is greater than or equal to the second preset amplitude difference value.
Specifically, the central control module calculates the difference between the pressure difference and the first preset pressure difference in the second determination mode and marks the difference as a distance difference, and the adjustment module determines an adjustment mode for the arrangement distance of the detectors in a single group according to the distance difference, wherein,
the first interval adjusting mode is that the adjusting module uses a first preset interval adjusting coefficient of 0.90 to reduce the arrangement interval of the single-group detectors to a corresponding value; the first interval adjusting mode meets the condition that the interval difference value is smaller than a first preset interval difference value by 0.01;
the second interval adjusting mode is that the adjusting module uses a second preset interval adjusting coefficient of 0.80 to reduce the arrangement interval of the single-group detectors to a corresponding value; the second interval adjustment mode meets the condition that the interval difference value is larger than or equal to the first preset interval difference value and smaller than a second preset interval difference value by 0.03;
the third interval adjusting mode is that the adjusting module uses a third preset interval adjusting coefficient of 0.70 to reduce the arrangement interval of the single group of detectors to a corresponding value; the third interval adjusting mode meets the condition that the interval difference value is larger than or equal to the second preset interval difference value.
Specifically, the central control module determines a determination mode for the grade of the seismic event according to the amplitude of the peak value in the seismic wave monitored by the detector under a third preset condition, wherein,
the first grade judging mode is that the central control module judges the grade of the seismic event as one grade; the first level judgment mode meets the condition that the amplitude of a peak value in the seismic wave is more than or equal to 400 mu m of a first preset amplitude and less than 700 mu m of a second preset amplitude;
the second grade judging mode is that the central control module judges that the grade of the seismic event is two grades; the second level judgment mode meets the condition that the amplitude of the peak value in the seismic wave is larger than or equal to the second preset amplitude and smaller than the third preset amplitude by 800 mu m;
the third grade judging mode is that the central control module judges that the grade of the seismic event is three grades; the third level judgment mode meets the condition that the amplitude of the peak value in the seismic wave is larger than or equal to the third preset amplitude and smaller than the fourth preset amplitude by 1000 mu m.
Specifically, the sensitivity of the detector is 190v/m/s-210v/m/s.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A shale oil fracturing microseism monitoring method, characterized by comprising the steps of:
s1, taking an oil well outlet as an origin and arranging a plurality of groups of detectors at equal intervals along the azimuth of a shale oil horizontal well, wherein for a single group of detectors, the single group of detectors comprise a plurality of detectors which are arranged at equal intervals along the vertical direction of the shale oil horizontal well;
s2, shale oil fracturing construction is carried out, seismic waves collected by each detector in a construction stage are transmitted to a central control module, and aiming at a single detector, the central control module judges the grade of a seismic event and the times of the seismic event according to the seismic waves returned by the single detector;
step S3, the central control module calculates simulated daily output after fracturing according to the grade of the seismic event and the times of the seismic event acquired by each detector, judges whether monitoring in the shale oil fracturing process meets preset standards according to the difference value between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing, determines a secondary judging mode aiming at whether the monitoring in the shale oil fracturing process meets the preset standards according to the pressure difference value when the monitoring does not meet the preset standards, or increases the particle size of supporting particles in a fracturing agent used in the next fracturing process to a corresponding value according to the difference value between the daily output difference value and the second preset daily output difference value, and judges that monitoring in the shale oil fracturing process is invalid;
in the step S3, the central control module calculates the post-fracturing simulated daily output D according to the grade of the seismic event and the number of times of the seismic event acquired by each detector, and setsWherein α is an evaluation coefficient, α=0.51, ni is a grade of an ith seismic event monitored by a jth detector, i=1, 2,3,..n, n is a total number of seismic events monitored by the detectors, j=1, 2,3,..m, m is a total number of detectors arranged.
2. The shale oil fracturing microseism monitoring method according to claim 1, wherein the central control module calculates the difference value between the actual daily output of the oil well after fracturing and the simulated daily output after fracturing under a first preset condition, and the central control module determines a judging mode for judging whether monitoring in the shale oil fracturing process meets a preset standard or not according to the obtained daily output difference value,
the first judging mode is that the central control module judges that monitoring in the shale oil fracturing process meets a preset standard, and monitoring in the next shale oil fracturing process is completed according to a current monitoring method; the first judging mode meets the condition that the daily output difference is smaller than a first preset daily output difference;
the second judging mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, the central control module further controls the detection module to detect the pressure of the oil well after fracturing, the central control module calculates the difference between the pressure and the preset pressure according to the detected pressure and records the difference as a pressure difference, and the central control module determines a secondary judging mode for judging whether the monitoring in the shale oil fracturing process meets the preset standard or not according to the pressure difference; the second judging mode meets the condition that the daily output difference is larger than or equal to the first preset daily output difference and smaller than a second preset daily output difference;
the third judging mode is that the central control module judges that the reason that the monitoring in the shale oil fracturing process does not meet the preset standard and does not meet the preset standard is that the crack closure rate after fracturing is high, and the adjusting module increases the particle size of supporting particles in the fracturing agent used in the next fracturing process to a corresponding value according to the difference between the daily yield difference and the second preset daily yield difference; the third judging mode meets the condition that the daily output difference is larger than or equal to the second preset daily output difference and smaller than a third preset daily output difference;
the fourth judging mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard and the reason that the monitoring in the shale oil fracturing process does not meet the preset standard is that non-fracturing vibration exists in the fracturing process, and the central control module judges that monitoring in the shale oil fracturing process is invalid; the fourth judging mode meets the condition that the daily output difference value is larger than or equal to the third preset daily output difference value;
and the first preset condition is that the central control module finishes calculation of the simulated daily output after fracturing.
3. The shale oil fracturing microseismic monitoring method of claim 2 wherein the central control module calculates the difference between the daily output difference and the second preset daily output difference in the third decision mode and marks the difference as a support difference, the adjustment module determines an adjustment mode for the particle size of the support particles in the fracturing agent according to the support difference, wherein,
the first particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a first preset particle size adjusting coefficient; the first particle size adjustment mode meets the condition that the support difference value is smaller than a first preset support difference value;
the second particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a second preset particle size adjusting coefficient; the second particle size adjustment mode meets the requirement that the support difference value is larger than or equal to the first preset support difference value and smaller than a second preset support difference value;
the third particle size adjusting mode is that the adjusting module increases the particle size of the supporting particles in the fracturing agent to a corresponding value by using a third preset particle size adjusting coefficient; the third particle size adjusting mode meets the requirement that the support difference value is larger than or equal to the second preset support difference value.
4. The shale oil fracturing microseism monitoring method of claim 3, wherein the central control module calculates and records the difference between the regulated sedimentation velocity of the fracturing agent and the preset sedimentation velocity as a corrected difference under a second preset condition, the regulating module determines the correction mode of the particle size of the supporting particles in the fracturing agent according to the corrected difference,
the first correction mode is that the adjustment module uses a first preset correction coefficient to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the first correction mode meets the condition that the correction difference value is smaller than a first preset correction difference value;
the second correction mode is that the adjusting module uses a second preset correction coefficient to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the second correction mode meets the condition that the correction difference value is larger than or equal to the first preset correction difference value and smaller than a second preset correction difference value;
the third correction mode is that the adjustment module uses a third preset correction coefficient to reduce the particle size of the supporting particles in the fracturing agent to a corresponding value; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
the second preset condition is that the adjustment module completes adjustment of the particle size of the supporting particles in the fracturing agent and the sedimentation speed of the fracturing agent after adjustment is larger than a preset sedimentation speed.
5. The shale oil fracturing microseism monitoring method of claim 4 wherein the central control module controls the detection module to detect the pressure of the oil well after fracturing in the second judging mode, the central control module calculates the difference between the pressure and the preset pressure according to the detected pressure and marks the difference as the pressure difference, the central control module determines whether the monitoring in the shale oil fracturing process meets the secondary judging mode of the preset standard according to the pressure difference, wherein,
the first secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process meets a preset standard, and monitoring in the next shale oil fracturing process is completed according to a current monitoring method; the first secondary judgment mode meets the condition that the pressure difference value is smaller than a first preset pressure difference value;
the second secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, and the central control module reduces the arrangement interval of the single group of detectors to a corresponding value according to the difference value between the pressure difference value and the first preset pressure difference value; the second secondary judgment mode meets the condition that the pressure difference value is larger than or equal to the first preset pressure difference value and smaller than a second preset pressure difference value;
the third secondary judgment mode is that the central control module judges that monitoring in the shale oil fracturing process does not meet a preset standard, and the central control module increases the amplitude of the seismic waves detected by the detectors to a corresponding value according to the difference between the pressure difference and the second preset pressure difference; the third secondary judgment mode meets the condition that the pressure difference value is larger than or equal to the second preset pressure difference value.
6. The shale oil fracturing microseismic monitoring method of claim 5 wherein the central control module calculates a difference between the pressure difference and the second predetermined pressure difference in the third secondary decision mode and marks the difference as an amplitude difference, the adjustment module determining an adjustment mode for the amplitude of the seismic waves detected by the detectors based on the amplitude difference, wherein
The first amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a first preset amplitude adjustment coefficient; the first amplitude adjustment mode meets the condition that the amplitude difference value is smaller than a first preset amplitude difference value;
the second amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a second preset amplitude adjustment coefficient; the second amplitude adjustment mode meets the condition that the amplitude difference value is larger than or equal to the first preset amplitude difference value and smaller than a second preset amplitude difference value;
the third amplitude adjustment mode is that the adjustment module adjusts the amplitude of the seismic waves detected by the detector to a corresponding value by using a third preset amplitude adjustment coefficient; the third amplitude adjustment mode satisfies that the amplitude difference value is greater than or equal to the second preset amplitude difference value.
7. The shale oil fracturing microseism monitoring method of claim 6 wherein the central control module calculates the difference between the pressure difference and the first preset pressure difference in the second secondary judgment mode and marks the difference as a spacing difference, the adjustment module determines an adjustment mode for the arrangement spacing of the detectors of a single group according to the spacing difference, wherein,
the first interval adjusting mode is that the adjusting module uses a first preset interval adjusting coefficient to reduce the arrangement interval of the single group of detectors to a corresponding value; the first interval adjustment mode meets the condition that the interval difference value is smaller than a first preset interval difference value;
the second interval adjusting mode is that the adjusting module uses a second preset interval adjusting coefficient to reduce the arrangement interval of the single group of detectors to a corresponding value; the second interval adjusting mode meets the condition that the interval difference value is larger than or equal to the first preset interval difference value and smaller than a second preset interval difference value;
the third interval adjusting mode is that the adjusting module uses a third preset interval adjusting coefficient to reduce the arrangement interval of the single group of detectors to a corresponding value; the third interval adjusting mode meets the condition that the interval difference value is larger than or equal to the second preset interval difference value.
8. The shale oil fracturing microseism monitoring method of claim 1 wherein the central control module determines a decision mode for the grade of the seismic event according to the amplitude of the peak in the seismic waves monitored by the detectors under a third preset condition, wherein,
the first grade judging mode is that the central control module judges the grade of the seismic event as one grade; the first level judgment mode meets the condition that the amplitude of a peak value in the seismic wave is larger than or equal to a first preset amplitude and smaller than a second preset amplitude;
the second grade judging mode is that the central control module judges that the grade of the seismic event is two grades; the second level judgment mode meets the condition that the amplitude of the peak value in the seismic wave is larger than or equal to the second preset amplitude and smaller than a third preset amplitude;
the third grade judging mode is that the central control module judges that the grade of the seismic event is three grades; the third level judgment mode meets the condition that the amplitude of the peak value in the seismic wave is larger than or equal to the third preset amplitude and smaller than the fourth preset amplitude.
9. The shale oil fracturing microseismic monitoring method of claim 1 wherein the sensitivity of the geophone is 190v/m/s-210v/m/s.
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