Wellbore cleaning monitoring system

Abstract

A borehole cleaning monitoring system relates to the technical field of borehole monitoring, and comprises a data management module used for inputting and managing basic data of a well and transmitting the basic data to a calculation and analysis module, and a data monitoring module used for receiving and displaying well rock debris monitoring information calculated and output by the calculation and analysis module, the calculation and analysis module is used for calculating basic data and data collected from the weighing module to obtain and analyze various data of rock debris, the control module is used for controlling overturning and cleaning actions of the weighing module, and the rock debris weighing return-out online weighing module is used for collecting sensor signals of the weighing module and sending the sensor signals to the control module. The wellbore state evaluation module is used for monitoring and evaluating a wellbore and a well wall according to the data obtained by the calculation and analysis module and providing data for the prevention and correction module, and the prevention and correction module is used for identifying the difference between the actual rock debris amount expected value and the trend. The problems of poor borehole cleaning, borehole wall collapse and shaft instability can be found in time, and drilling safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of wellbore monitoring, and in particular to a wellbore cleaning monitoring system. Background Art

[0002] During the drilling process, the drilling fluid displacement is small during vertical well operation, resulting in poor cuttings carrying. The poor rheological properties of the drilling fluid are not conducive to the suspension of rock carrying, which can easily cause the wellbore to be unclean, resulting in repeated cutting of the drill bit, and causing adhesion and drill jamming, forming keyways and other accidents. When more complex drilling operations such as extended reach wells, high-angle wells, and horizontal wells are carried out in major oil and gas field operating areas, unclean wellbore will lead to increased operating risks and operating costs, and the stability of the wellbore will also deteriorate. While pursuing production capacity and benefits, facing the problem of rising development costs due to complex geological conditions, more and more people are paying attention to the value of ground data acquisition in real-time drilling optimization and real-time wellbore condition monitoring. The wellbore cleaning monitoring system can achieve these goals without downhole equipment, thereby effectively reducing the operating costs and risks of using downhole equipment. However, there are few studies and products on direct measurement of cuttings flow in the existing technology, and it is not possible to identify problems such as poor wellbore cleaning and wellbore instability at an early stage. Summary of the invention

[0003] The purpose of the present invention is to provide a wellbore cleaning monitoring system, which can timely detect problems such as poor wellbore cleaning, well wall collapse and wellbore instability, and can also effectively prevent and solve the problem of drill sticking during drilling. It can provide accurate real-time wellbore cleaning information, provide effective data for drilling, and can timely reduce the risks of operations such as horizontal wells and reduce non-production time.

[0004] The technical solution adopted by the present invention to achieve its invention object is: a wellbore cleaning monitoring system, which is composed of a data management module, a data monitoring module, a calculation and analysis module, a control module, a cuttings meter re-entry and re-entry online weighing module, a wellbore status evaluation module, and a preventive correction module, wherein:

[0005] The data management module is used to input and manage the relevant basic data of the well and transmit the basic data to the calculation and analysis module;

[0006] The data monitoring module is used to receive the calculation output results of the calculation and analysis module and display the information of the current well cuttings monitoring;

[0007] The calculation and analysis module is used to calculate the basic data received from the data management module and the data collected by the cuttings weighing module, obtain various data of the cuttings and analyze them;

[0008] The control module is used to control the flipping and cleaning of the weighing module to ensure accurate measurement of the cuttings returning to the weighing module.

[0009] The cuttings meter reentry and in-line weighing module is used to collect sensor signals from the weighing module and transmit data to the calculation and analysis module;

[0010] The wellbore status evaluation module is used to monitor and evaluate the wellbore and wellbore wall based on the data obtained by the calculation and analysis module, and provide data for the prevention and correction module;

[0011] The preventive correction module is used to identify the difference between the expected value and trend of the actual cuttings volume at an early stage according to the data provided by the wellbore status evaluation module, and take corresponding preventive measures in time.

[0012] Further, the data management module is composed as follows:

[0013] Well basic data management unit, used to manage the input data of all wells;

[0014] The open hole data management unit is used to edit the open hole related data of the selected well;

[0015] A formation density data management unit, used to input and manage formation density related data of the selected wells;

[0016] Cuttings weighing data management unit, used to manage the basic data of the wellbore cleaning monitoring system;

[0017] Mud logging data management unit, used to manage the basic data of mud logging access;

[0018] Computational analysis data management unit is used to manage the cuttings data of all wells.

[0019] Further, the data monitoring module is composed as follows:

[0020] Real-time data monitoring unit, used to display the engineering data of the current well in real time;

[0021] Real-time cuttings flow monitoring unit, used to display the monitoring data of actual cuttings flow in real time;

[0022] Theoretical cuttings flow monitoring unit, used to display the calculated data of theoretical cuttings flow in real time;

[0023] The cuttings return rate monitoring unit is used to display the cuttings return rate of the current well in real time.

[0024] Further, the calculation and analysis module is composed as follows:

[0025] The total cuttings flow calculation unit is used to calculate the sum of the cuttings flow measured by each measuring unit of the current well;

[0026] A cuttings flow parameter value calculation unit, used to input and calculate cuttings flow related parameters;

[0027] The actual cuttings volume calculation and analysis unit is used to calculate the actual cuttings volume of the current well;

[0028] Theoretical cuttings volume calculation and analysis unit, used to calculate the theoretical cuttings volume of the current well;

[0029] A cuttings volume balance relationship calculation and analysis unit is used to calculate and display the difference between the actual cuttings volume and the theoretical cuttings volume;

[0030] The cuttings return rate calculation and analysis unit is used to calculate and display the cuttings return rate, wherein the cuttings return rate = the difference between the actual cuttings volume and the theoretical cuttings volume / theoretical cuttings volume.

[0031] Further, the control module is composed as follows:

[0032] The weighing module hopper flipping interval control unit is used to set the time interval for flipping the weighing module according to the actual cuttings return situation;

[0033] The weighing module hopper cleaning control unit is used to set the time interval for automatic cleaning of the weighing module according to the actual return of cuttings.

[0034] Furthermore, the cuttings weighing module for re-entry and re-entry is composed of the following components:

[0035] The cuttings return weighing device is used to set the number of weighing modules and collect sensor signals of the weighing modules;

[0036] The automatic control unit for online weighing of returned cuttings is used to set the relevant acquisition parameters of the weighing module.

[0037] Further, the wellbore status evaluation module is composed as follows:

[0038] Wellbore cleaning monitoring and evaluation module, used for monitoring, display and evaluation of the entire well section and instantaneous cuttings flow rate under abnormal rock carrying conditions;

[0039] The wellbore instability monitoring and evaluation module is used to monitor, display and evaluate the entire well section and instantaneous cuttings flow rate under the wellbore instability state.

[0040] Furthermore, the wellbore cleaning monitoring and evaluation module is composed of the following:

[0041] The whole well rock carrying anomaly monitoring unit is used to monitor, display and evaluate the cuttings flow rate in the whole well section;

[0042] Instantaneous rock carrying anomaly monitoring unit, used for monitoring, displaying and evaluating instantaneous rock cuttings flow;

[0043] The components of the wellbore instability monitoring and evaluation module are as follows:

[0044] The whole wellbore instability monitoring unit is used to monitor, display and evaluate the cuttings flow rate in the whole well section;

[0045] The instantaneous wellbore instability monitoring unit is used to monitor, display and evaluate the instantaneous cuttings flow.

[0046] Further, the preventive correction module is composed as follows:

[0047] Solid rock cuttings return rates are lower than expected for the unit, which is used to infer rock cuttings deposition;

[0048] The unit with slow solid cuttings return rate is used to infer that the drilling fluid sand carrying index is lower than expected;

[0049] Solid cuttings return rates are higher than expected for the unit and are used to infer wellbore instability.

[0050] The beneficial effects of the present invention are:

[0051] The present invention installs a weighing module, i.e., a cuttings weighing instrument, at the vibrating screen at the drilling site to accurately measure the weight of solid cuttings in the wellbore, calculate the actual cuttings and theoretical cuttings volume and flow in real time, quantitatively monitor the cuttings return from the well bottom, and then evaluate the wellbore status, helping engineering and technical personnel to judge the wellbore cleanliness and ensure drilling safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is an overall block diagram of a wellbore cleaning monitoring system according to an embodiment of the present invention;

[0053] Figure 2 is a block diagram of a data management module according to an embodiment of the present invention;

[0054] Figure 3 is a block diagram of a data monitoring module according to an embodiment of the present invention;

[0055] Figure 4 is a block diagram of a computing and analysis module according to an embodiment of the present invention;

[0056] Figure 5 is a block diagram of a control module according to an embodiment of the present invention;

[0057] Figure 6 It is a block diagram of a cuttings weighing module for weighing the cuttings in and out of an embodiment of the present invention;

[0058] Figure 7 is a block diagram of a wellbore status evaluation module according to an embodiment of the present invention;

[0059] Figure 8 is a block diagram of a preventive correction module according to an embodiment of the present invention;

[0060] Fig. 9 1 is a graph showing the relationship between the rock cuttings return rate of a column and the average drilling time of the column according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Figures 1 to 8 It is shown that a specific embodiment of the present invention is a wellbore cleaning monitoring system, which is composed of a data management module 100, a data monitoring module 200, a calculation and analysis module 300, a control module 400, a cuttings meter re-entry and re-entry online weighing module 500, a wellbore status evaluation module 600, and a preventive correction module 700, wherein:

[0063] The data management module 100 is used to input and manage the relevant basic data of the well and transmit the basic data to the calculation and analysis module 300;

[0064] The data monitoring module 200 is used to receive the results calculated and output by the calculation and analysis module 300, and display the information of the current well cuttings monitoring;

[0065] The calculation and analysis module 300 is used to calculate the basic data received from the data management module 100 and the data collected by the cuttings weighing module 500 to obtain and analyze various data of the cuttings;

[0066] The control module 400 is used to control the flipping and cleaning action of the weighing module to ensure the accurate measurement of the cuttings returning to the weighing module 500;

[0067] The cuttings weighing module 500 is used to collect sensor signals of the weighing module and transmit data to the calculation and analysis module 300;

[0068] The wellbore status evaluation module 600 is used to monitor and evaluate the wellbore and wellbore wall according to the data obtained by the calculation and analysis module 300, and provide data for the prevention and correction module 700;

[0069] The preventive correction module 700 is used to identify the difference between the expected value and the trend of the actual cuttings volume at an early stage according to the data provided by the wellbore status evaluation module 600, and to take corresponding preventive measures in time.

[0070] The data management module 100 is composed as follows:

[0071] Well basic data management unit 101, used to manage the input data of all wells;

[0072] A naked hole data management unit 102, used to edit the naked hole related data of the selected well;

[0073] The formation density data management unit 103 is used to input and manage the formation density related data of the selected well;

[0074] A cuttings weighing data management unit 104, used to manage basic data of the wellbore cleaning monitoring system;

[0075] A logging data management unit 105 is used to manage basic data accessed by logging;

[0076] The computing and analysis data management unit 106 is used to manage the rock cuttings data of all wells.

[0077] The data monitoring module 200 is composed as follows:

[0078] A real-time data monitoring unit 201 is used to display the engineering data of the current well in real time;

[0079] A real-time cuttings flow monitoring unit 202, used to display monitoring data of actual cuttings flow in real time;

[0080] Theoretical cuttings flow rate monitoring unit 203, used for displaying the calculated data of theoretical cuttings flow rate in real time;

[0081] The cuttings return rate monitoring unit 204 is used to display the cuttings return rate of the current well in real time.

[0082] The calculation and analysis module 300 is composed of the following:

[0083] The total cuttings flow calculation unit 301 is used to calculate the sum of the cuttings flow measured by each measuring unit of the current well;

[0084] A cuttings flow parameter value calculation unit 302, used to input and calculate cuttings flow related parameters;

[0085] The actual cuttings volume calculation and analysis unit 303 is used to calculate the actual cuttings volume of the current well;

[0086] Theoretical cuttings volume calculation and analysis unit 304, used to calculate the theoretical cuttings volume of the current well;

[0087] A cuttings volume balance relationship calculation and analysis unit 305 is used to calculate and display the difference between the actual cuttings volume and the theoretical cuttings volume;

[0088] The cuttings return rate calculation and analysis unit 306 is used to calculate and display the cuttings return rate, wherein the cuttings return rate = the difference between the actual cuttings volume and the theoretical cuttings volume / theoretical cuttings volume.

[0089] The control module 400 is composed as follows:

[0090] The weighing module hopper turning interval control unit 401 is used to set the time interval for the weighing module turning according to the actual cuttings return situation;

[0091] The weighing module hopper cleaning control unit 402 is used to set the time interval for automatic cleaning of the weighing module according to the actual return of rock cuttings.

[0092] The rock cuttings weighing re-entry and re-entry online weighing module 500 is composed as follows:

[0093] The cuttings return weighing device 501 is used to set the number of weighing modules and collect sensor signals of the weighing modules;

[0094] The cuttings return online weighing automatic control unit 502 is used to set the relevant acquisition parameters of the weighing module.

[0095] The wellbore status evaluation module 600 is composed as follows:

[0096] Wellbore cleaning monitoring and evaluation module 601, used for monitoring, displaying and evaluating the entire well section and instantaneous cuttings flow rate under abnormal rock carrying conditions;

[0097] The wellbore instability monitoring and evaluation module 602 is used for monitoring, displaying and evaluating the entire well section and instantaneous cuttings flow rate when the wellbore is in an unstable state.

[0098] The components of the wellbore cleaning monitoring and evaluation module 601 are as follows:

[0099] The whole well rock carrying anomaly monitoring unit 6011 is used for monitoring, displaying and evaluating the cuttings flow rate in the whole well section;

[0100] The instantaneous rock carrying anomaly monitoring unit 6012 is used for monitoring, displaying and evaluating the instantaneous rock cuttings flow;

[0101] The components of the wellbore instability monitoring and evaluation module 602 are as follows:

[0102] The whole wellbore instability monitoring unit 6021 is used for monitoring, displaying and evaluating the cuttings flow rate in the whole well section;

[0103] The instantaneous wellbore instability monitoring unit 6022 is used for monitoring, displaying and evaluating the instantaneous cuttings flow rate.

[0104] The preventive correction module 700 is composed as follows:

[0105] The solid cuttings return rate is lower than expected for unit 701, which is used to infer cuttings deposition;

[0106] The solid cuttings return rate is slow unit 702, which is used to infer that the drilling fluid sand carrying index is lower than expected;

[0107] The solid cuttings return rate is higher than expected in cell 703, which is used to infer wellbore instability.

[0108] This embodiment installs a weighing module, i.e., a cuttings weighing instrument, at the vibrating screen at the drilling site to accurately measure the weight of solid cuttings, calculate the actual cuttings flow rate and the theoretical cuttings flow rate in real time, and quantitatively monitor the return of cuttings from the bottom of the well in combination with the on-site comprehensive logging data such as the well depth, the time of delay, and the drilling time, so as to evaluate the wellbore status, help engineering and technical personnel judge the wellbore cleanliness, ensure drilling safety, and be able to identify the difference between the expected value of the actual cuttings volume and the trend based on the drilling time and the drill bit diameter at an early stage, so as to take safe and timely preventive measures to correct the situation.

[0109] Wherein: the preventive correction module 700 includes a lower than expected solid cuttings return rate unit 701, a slower solid cuttings return rate unit 702, and a higher than expected solid cuttings return rate unit 703. According to the lower than expected solid cuttings return rate unit 701, it can be inferred that the cuttings are deposited, according to the slower solid cuttings return rate unit 702, it can be inferred that the drilling fluid sand carrying index is lower than expected, and according to the higher than expected solid cuttings return rate unit 703, it can be inferred that the wellbore is unstable. For example, according to the lower than expected solid cuttings return rate unit 701, it can be inferred that the cuttings are deposited. If it is not treated, it will increase the possibility of blockage and stuck. Once it is determined, the mitigation measures are: increase the density of the drilling fluid, pump in cleaning slurry or additives, enhance the rotation of the pipe string, or introduce a single column reciprocating motion at the connection, or extend the wellbore travel as appropriate. According to the slower solid cuttings return rate unit 702, it can be inferred that the drilling fluid sand carrying index is lower than expected, so it can be easily improved by optimizing the rheological properties of the drilling fluid such as drilling fluid density and gel. Based on the higher than expected solid cuttings return rate in unit 703, it can be inferred that the wellbore is unstable, resulting in unregulated open hole and wellbore collapse. It is important that all these solids are effectively circulated out of the wellbore to reduce the annular solids load, while managing the equivalent density of the drilling fluid to minimize further erosion of the wellbore.

[0110] In addition, the calculation and analysis module 300 includes a total cuttings flow calculation unit 301, a cuttings flow parameter calculation unit 302, an actual cuttings volume calculation and analysis unit 303, a theoretical cuttings volume calculation and analysis unit 304, a cuttings volume balance relationship calculation and analysis unit 305, and a cuttings return rate calculation and analysis unit 306, wherein the total cuttings flow calculation unit 301 is the sum of the cuttings flow rates measured by each measuring unit, and the number of measuring units is allocated according to the number of vibrating screens, and the cuttings flow parameter calculation unit 302 is used to compare with the actual cuttings flow rate.

[0111] During specific operations, when there is no cuttings bed or the wellbore wall is unstable, if the cuttings return rate of the column continues to increase, the number of pulls and circulation time will be increased accordingly to promote the timely return of cuttings or broken blocks; if there is a cuttings bed and the cuttings return rate of the column continues to decrease, it is necessary to carry out drilling operations to assist in breaking the cuttings bed. In the actual operation process, it is necessary to take technical measures for wellbore cleaning based on the on-site conditions to improve drilling efficiency and reduce downhole risks. In the specific construction process, before the column is pulled, circulated, and ready to continue drilling, the cuttings return rate of the column is used as a control indicator to evaluate the feasibility of the next column safe drilling, and establish a "one column, one cleaning" wellbore cleaning construction concept. The cuttings return rate of the column means that for each column drilled, a statistical analysis of the cuttings return rate of the column section is performed. From Fig. 9 It can be seen from the "Relationship between the column cuttings return rate and the average column drilling time" that in the horizontal section, when the drilling time is relatively fast, the drilling fluid rock carrying efficiency is certain, the cuttings and blocks are difficult to return in time, and the column cuttings return rate is insufficient. Comprehensively measuring the drilling time efficiency and the wellbore cleaning situation, when the column cuttings return rate is less than 80%, the wellbore cleaning is poor, and when the return rate is higher than 115%, there may be instability of the wellbore wall. When it is between the two, it is a safe drilling state.

[0112] The wellbore cleaning monitoring and evaluation module 601 includes a whole-well rock carrying anomaly monitoring unit 6011 and an instantaneous rock carrying anomaly monitoring unit 6012. The wellbore instability monitoring and evaluation module 602 includes a whole-wellbore instability monitoring unit 6021 and an instantaneous wellbore instability monitoring unit 6022. The whole-well rock carrying anomaly monitoring unit 6011 compares the data of the actual rock cuttings volume calculation and analysis unit 303 with the data of the theoretical rock cuttings volume calculation and analysis unit 304. When the actual rock cuttings volume is less than the theoretical rock cuttings volume, it is judged as a whole-well rock carrying anomaly. When the instantaneous rock carrying anomaly monitoring unit 6012 finds that the actual instantaneous rock cuttings flow rate is less than the theoretical instantaneous rock cuttings flow rate, it is judged as an instantaneous rock carrying anomaly. It should be noted that when the whole-well rock carrying anomaly monitoring unit 6011 finds that the actual rock cuttings volume is less than the theoretical rock cuttings volume, it is judged as the whole-well rock carrying anomaly, providing technical support for optimizing the wellbore cleaning processing time and plugging operations. When the actual instantaneous rock cuttings flow rate is less than the theoretical instantaneous rock cuttings flow rate in the instantaneous rock carrying anomaly monitoring unit 6012, it is judged as an instantaneous rock carrying anomaly. According to the relationship between the annular cuttings settling velocity and the drilling fluid return velocity, the rock carrying index model is corrected in real time to evaluate the rock carrying capacity of the drilling fluid, providing a basis for optimizing the drilling fluid performance.

[0113] In addition, the whole well wall instability monitoring unit 6021 compares the data of the actual cuttings volume calculation and analysis unit 303 and the theoretical cuttings volume calculation and analysis unit 304, and judges that the whole well wall is unstable when the actual cuttings volume is greater than the theoretical cuttings volume. The instantaneous well wall instability monitoring unit 6022 finds that the actual instantaneous cuttings flow rate is greater than the theoretical instantaneous cuttings flow rate, and judges the true and false cuttings in combination with geological logging observation. It should be noted that the whole well wall instability monitoring unit 6021 judges that the whole well wall is unstable when the actual cuttings volume is greater than the theoretical cuttings volume, providing technical support for optimizing drilling fluid performance and drilling parameters to prevent malignant well collapse. The instantaneous well wall instability monitoring unit 6022 judges the true and false cuttings in combination with geological logging observation when the actual instantaneous cuttings flow rate is greater than the theoretical instantaneous cuttings flow rate, and early diagnoses whether the well wall instability problem occurs, providing technical support for preventing block drop and drill jam.

[0114] The above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes and modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A wellbore cleaning monitoring system, characterized in that: The system is composed of a data management module (100), a data monitoring module (200), a calculation and analysis module (300), a control module (400), a cuttings reentry and in-line weighing module (500), a wellbore status evaluation module (600), and a preventive correction module (700), wherein: The data management module (100) is used to input and manage relevant basic data of the well, and transmit the basic data to the calculation and analysis module (300); The data monitoring module (200) is used to receive the calculation output result of the calculation analysis module (300) and display the information of the current well cuttings monitoring; The calculation and analysis module (300) is used to calculate the basic data received from the data management module (100) and the data collected by the cuttings weighing module (500) to obtain various data of the cuttings and perform analysis; The control module (400) is used to control the flipping and cleaning action of the weighing module, so as to ensure the accurate measurement of the cuttings returning to and from the online weighing module (500); The cuttings weighing module (500) is used to collect sensor signals of the weighing module and transmit data to the calculation and analysis module (300); The wellbore status evaluation module (600) is used to monitor and evaluate the wellbore and well wall according to the data obtained by the calculation and analysis module (300), and provide data for the prevention and correction module (700); The preventive correction module (700) is used to identify the difference between the expected value of the actual cuttings volume and the trend at an early stage according to the data provided by the wellbore status evaluation module (600), and to take corresponding preventive measures in time.

2. A wellbore cleaning monitoring system according to claim 1, characterized in that: The data management module (100) is composed as follows: A well basic data management unit (101), used to manage the input data of all wells; A naked hole data management unit (102), used for editing the naked hole related data of the selected well; A formation density data management unit (103), used for inputting and managing formation density related data of the selected well; A cuttings weighing data management unit (104), used to manage basic data of a wellbore cleaning monitoring system; A logging data management unit (105), used to manage basic data accessed by logging; The computing and analysis data management unit (106) is used to manage the cuttings data of all wells.

3. A wellbore cleaning monitoring system according to claim 1, characterized in that: The data monitoring module (200) is composed as follows: A real-time data monitoring unit (201), used for displaying the engineering data of the current well in real time; A real-time cuttings flow monitoring unit (202), used for displaying monitoring data of actual cuttings flow in real time; A theoretical cuttings flow rate monitoring unit (203), used for displaying the calculated data of the theoretical cuttings flow rate in real time; The cuttings return rate monitoring unit (204) is used to display the cuttings return rate of the current well in real time.

4. A wellbore cleaning monitoring system according to claim 1, characterized in that: The calculation and analysis module (300) is composed as follows: A total cuttings flow calculation unit (301) is used to calculate the sum of the cuttings flow rates measured by each measuring unit of the current well; A cuttings flow parameter value calculation unit (302), used to input and calculate cuttings flow related parameters; An actual cuttings volume calculation and analysis unit (303) is used to calculate the actual cuttings volume of the current well; Theoretical cuttings volume calculation and analysis unit (304), used to calculate the theoretical cuttings volume of the current well; A cuttings volume balance relationship calculation and analysis unit (305) is used to calculate and display the difference between the actual cuttings volume and the theoretical cuttings volume; The cuttings return rate calculation and analysis unit (306) is used to calculate and display the cuttings return rate, wherein the cuttings return rate = the difference between the actual cuttings volume and the theoretical cuttings volume / theoretical cuttings volume.

5. A wellbore cleaning monitoring system according to claim 1, characterized in that: The control module (400) is composed as follows: A weighing module hopper flipping interval control unit (401) is used to set the time interval for flipping the weighing module according to the actual rock cuttings return situation; The weighing module hopper cleaning control unit (402) is used to set the time interval for automatic cleaning of the weighing module according to the actual return of rock cuttings.

6. A wellbore cleaning monitoring system according to claim 1, characterized in that: The rock cuttings weighing re-entry and re-entry online weighing module (500) is composed of the following: The rock cuttings return weighing device (501) is used to set the number of weighing modules and collect sensor signals of the weighing modules; The cuttings return online weighing automatic control unit (502) is used to set the relevant acquisition parameters of the weighing module.

7. A wellbore cleaning monitoring system according to claim 1, characterized in that: The wellbore status evaluation module (600) is composed of the following: A borehole cleaning monitoring and evaluation module (601) is used for monitoring, displaying and evaluating the entire well section and instantaneous cuttings flow rate under abnormal rock carrying conditions; The wellbore instability monitoring and evaluation module (602) is used for monitoring, displaying and evaluating the entire well section and instantaneous cuttings flow rate when the wellbore is in an unstable state.

8. A wellbore cleaning monitoring system according to claim 7, characterized in that: The wellbore cleaning monitoring and evaluation module (601) is composed of the following: The whole well rock carrying anomaly monitoring unit (6011) is used for monitoring, displaying and evaluating the cuttings flow rate in the whole well section; Instantaneous rock carrying anomaly monitoring unit (6012), used for monitoring, displaying and evaluating instantaneous rock cuttings flow; The wellbore instability monitoring and evaluation module (602) is composed of the following: The whole wellbore instability monitoring unit (6021) is used to monitor, display and evaluate the cuttings flow rate in the whole well section; The instantaneous wellbore instability monitoring unit (6022) is used for monitoring, displaying and evaluating the instantaneous cuttings flow.

9. A wellbore cleaning monitoring system according to claim 1, characterized in that: The preventive correction module (700) is composed as follows: The solid rock cuttings return rate is lower than expected for unit (701), which is used to infer rock cuttings deposition; The solid cuttings return rate is slow unit (702), which is used to infer that the drilling fluid sand carrying index is lower than expected; The solid cuttings return rate is higher than expected in the cell (703), which is used to infer wellbore instability.

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