An online monitoring system for drilling fluid density based on artificial intelligence

Abstract

The present invention relates to the field of drilling fluid density monitoring, and specifically discloses an online monitoring system for drilling fluid density based on artificial intelligence. The present invention comprehensively analyzes the appropriate density of drilling fluid through factors affecting the density of drilling fluid, such as formation pressure, well wall stability, suspended rock cuttings, drill head heating and transmitted hydrodynamics, so that the density of drilling fluid is better adapted to the drilling operation conditions; a large amount of historical drilling fluid density data and corresponding pressure, temperature, flow rate and other data are used as training samples, and a drilling fluid density calculation model is constructed using a machine learning algorithm to achieve real-time and accurate monitoring of the density of drilling fluid; based on the appropriate density and actual density of the drilling fluid, the drilling fluid density is adaptively adjusted so that the drilling fluid can give full play to its role, so as to timely adjust the drilling operation parameters, effectively reduce the probability of drilling accidents such as blowouts and well leakage, and ensure the life safety of drilling operators and the safety of equipment.

Description

Technical Field

[0001] The invention relates to the field of drilling fluid density monitoring, and in particular to an artificial intelligence-based online drilling fluid density monitoring system. Background Art

[0002] Drilling fluid refers to the general term for various circulating fluids that meet the needs of drilling work with its multiple functions during oil and gas drilling, also known as mud. Drilling fluid can not only make the liquid column pressure greater than the formation pressure to balance the formation pressure and prevent blowouts, but also provide sufficient support for the well wall, prevent well collapse and stabilize the well wall. It also has the function of carrying and suspending cuttings. Through its own circulation, it carries the cuttings broken by the drill bit at the bottom of the well to the ground to keep the wellbore clean. It can also rely on its viscosity and shear force to suspend the cuttings in the well in the drilling fluid, so that the cuttings will not sink quickly, so as to prevent complex situations such as sand settling and drilling.

[0003] Drilling fluid density is a key parameter in drilling engineering. The density of drilling fluid will be adjusted to different values ​​according to actual needs. Accurate monitoring of drilling fluid density helps ensure the safety and efficiency of the drilling process. During drilling operations, too high a density of drilling fluid may cause formation ruptures, leading to complex situations such as well leakage, while too low a density may not be able to effectively control formation pressure, causing serious accidents such as blowouts.

[0004] Therefore, it is of practical significance to monitor and control the density of drilling fluid, thereby ensuring the safety and efficiency of drilling operations.

[0005] However, the existing drilling fluid density monitoring and control methods still have some limitations and shortcomings in practical applications.

[0006] For example, an existing Chinese patent with authorization announcement number CN107478544B discloses a method and device for determining the density of drilling fluid in a saline layer, including: determining a first density of the drilling fluid according to the depth of the saline layer, the internal pressure resistance of the wellhead equipment and the formation pressure; determining a second density of the drilling fluid according to the minimum fracture pressure of the formation above the saline layer and the formation depth corresponding to the minimum fracture pressure; determining a third density of the drilling fluid according to a first capacity limit of the wellhead equipment for brine within a preset time, a second capacity limit of the drilling fluid for brine, a third capacity limit of the drilling fluid circulation channel for brine, and a preset maximum intrusion amount of brine in the drilling fluid; determining a first target density of the drilling fluid according to the first density, the second density and the third density, thereby achieving accurate determination of the density of the drilling fluid in the saline layer, thereby improving drilling safety and drilling efficiency.

[0007] The above patent provides a method for determining the density of drilling fluid more accurately, but does not involve the analysis of the appropriate density of drilling fluid and the adaptive regulation of the density of drilling fluid, which may make the density of drilling fluid incompatible with the actual working conditions of drilling operation, and thus fail to ensure the safety and efficiency of drilling operation.

[0008] In view of the above problems, the present invention proposes an online monitoring system for drilling fluid density based on artificial intelligence to realize the function of monitoring drilling fluid density.

[0009] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides an artificial intelligence-based online monitoring system for drilling fluid density, including: a drilling fluid density first associated information acquisition module, a drilling fluid suitable density preliminary analysis module, a drilling fluid density second associated information acquisition module, a drilling fluid suitable density compensation correction module, a drilling fluid current density monitoring module, a drilling fluid density adjustment demand judgment module, a drilling fluid density adaptive adjustment module, and a database.

[0010] The drilling fluid suitable density preliminary analysis module is respectively connected to the drilling fluid density first associated information acquisition module and the drilling fluid density second associated information acquisition module, the drilling fluid suitable density compensation correction module is respectively connected to the drilling fluid density second associated information acquisition module and the drilling fluid current density monitoring module, the drilling fluid density adjustment demand judgment module is respectively connected to the drilling fluid current density monitoring module and the drilling fluid density adaptive adjustment module, and the database is respectively connected to the drilling fluid density first associated information acquisition module, the drilling fluid suitable density preliminary analysis module, the drilling fluid density second associated information acquisition module and the drilling fluid current density monitoring module.

[0011] Drilling fluid density first associated information acquisition module: used to acquire first associated information of drilling fluid density, wherein the first associated information includes formation pressure and wellbore stability of drilling.

[0012] Preliminary analysis module of suitable density of drilling fluid: used to obtain historical drilling project operation information, respectively construct relationship models between formation pressure and wellbore stability and drilling fluid density, and preliminarily analyze the suitable density of drilling fluid based on the first correlation information of drilling fluid density.

[0013] The drilling fluid density second associated information acquisition module is used to acquire the second associated information of the drilling fluid density, wherein the second associated information includes the drilling cuttings density, drill bit heat, and required transfer water power.

[0014] The drilling fluid suitable density compensation correction module is used to analyze the compensation amount of the drilling fluid suitable density according to the second associated information of the drilling fluid density, and correct the suitable density of the drilling fluid.

[0015] Drilling fluid current density monitoring module: used to collect the current drilling fluid pressure, temperature and flow rate through sensors, and obtain historical drilling fluid density data and the corresponding drilling fluid pressure, temperature and flow rate, and use machine learning algorithms to build a drilling fluid density calculation model to further analyze the current drilling fluid density.

[0016] Drilling fluid density adjustment demand judgment module: used to analyze the matching index of drilling fluid density according to the appropriate density of drilling fluid and the current density of drilling fluid, and judge whether the density of drilling fluid needs to be adjusted. If adjustment is required, the drilling fluid density adaptive adjustment module is executed.

[0017] Drilling fluid density adaptive adjustment module: used to obtain adjustment information of drilling fluid density, where the adjustment information includes adjustment direction and adjustment amount, and provide feedback.

[0018] Database: used to store information on the mechanical properties of various types of rocks, historical drilling project operation information, density of various types of rock cuttings, and store historical drilling fluid density data and the corresponding drilling fluid pressure, temperature, and flow rate.

[0019] Compared with the prior art, the artificial intelligence-based online monitoring system for drilling fluid density described in the present invention has the following beneficial effects: 1. The present invention comprehensively analyzes the suitable density of drilling fluid by combining the main factors affecting the density of drilling fluid, such as formation pressure and well wall stability, and the secondary factors affecting the density of drilling fluid, such as suspended rock cuttings, heat generated by drill bit operation, and transmitted water power, thereby improving the reliability of the analysis results of the suitable density of drilling fluid, so that the density of drilling fluid is better adapted to the drilling operation conditions, thereby ensuring the safety and efficiency of drilling operations.

[0020] 2. The present invention uses a large amount of historical drilling fluid density data and corresponding pressure, temperature, flow rate and other data as training samples, and utilizes a machine learning algorithm to construct a drilling fluid density calculation model, thereby being able to accurately calculate the drilling fluid density based on the newly collected data, thereby achieving real-time and precise monitoring of the drilling fluid density.

[0021] 3. The present invention adaptively adjusts the density of the drilling fluid based on the appropriate density and actual density of the drilling fluid, so that the drilling fluid can fully play its role, so as to timely adjust the drilling operation parameters, thereby effectively reducing the probability of drilling accidents such as blowouts and well leakage, thereby ensuring the life safety of drilling operators and the safety of equipment. Summary of the invention

[0022] In view of the above problems, the present invention proposes an online monitoring system for drilling fluid density based on artificial intelligence to realize the function of monitoring drilling fluid density.

[0023] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides an artificial intelligence-based online monitoring system for drilling fluid density, including: a drilling fluid density first associated information acquisition module, a drilling fluid suitable density preliminary analysis module, a drilling fluid density second associated information acquisition module, a drilling fluid suitable density compensation correction module, a drilling fluid current density monitoring module, a drilling fluid density adjustment demand judgment module, a drilling fluid density adaptive adjustment module, and a database.

[0024] The drilling fluid suitable density preliminary analysis module is respectively connected to the drilling fluid density first associated information acquisition module and the drilling fluid density second associated information acquisition module, the drilling fluid suitable density compensation correction module is respectively connected to the drilling fluid density second associated information acquisition module and the drilling fluid current density monitoring module, the drilling fluid density adjustment demand judgment module is respectively connected to the drilling fluid current density monitoring module and the drilling fluid density adaptive adjustment module, and the database is respectively connected to the drilling fluid density first associated information acquisition module, the drilling fluid suitable density preliminary analysis module, the drilling fluid density second associated information acquisition module and the drilling fluid current density monitoring module.

[0025] Drilling fluid density first associated information acquisition module: used to acquire first associated information of drilling fluid density, wherein the first associated information includes formation pressure and wellbore stability of drilling.

[0026] Preliminary analysis module of suitable density of drilling fluid: used to obtain historical drilling project operation information, respectively construct relationship models between formation pressure and wellbore stability and drilling fluid density, and preliminarily analyze the suitable density of drilling fluid based on the first correlation information of drilling fluid density.

[0027] The drilling fluid density second associated information acquisition module is used to acquire the second associated information of the drilling fluid density, wherein the second associated information includes the drilling cuttings density, drill bit heat, and required transfer water power.

[0028] The drilling fluid suitable density compensation correction module is used to analyze the compensation amount of the drilling fluid suitable density according to the second associated information of the drilling fluid density, and correct the suitable density of the drilling fluid.

[0029] Drilling fluid current density monitoring module: used to collect the current drilling fluid pressure, temperature and flow rate through sensors, and obtain historical drilling fluid density data and the corresponding drilling fluid pressure, temperature and flow rate, and use machine learning algorithms to build a drilling fluid density calculation model to further analyze the current drilling fluid density.

[0030] Drilling fluid density adjustment demand judgment module: used to analyze the matching index of drilling fluid density according to the appropriate density of drilling fluid and the current density of drilling fluid, and judge whether the density of drilling fluid needs to be adjusted. If adjustment is required, the drilling fluid density adaptive adjustment module is executed.

[0031] Drilling fluid density adaptive adjustment module: used to obtain adjustment information of drilling fluid density, where the adjustment information includes adjustment direction and adjustment amount, and provide feedback.

[0032] Database: used to store information on the mechanical properties of various types of rocks, historical drilling project operation information, density of various types of rock cuttings, and store historical drilling fluid density data and the corresponding drilling fluid pressure, temperature, and flow rate.

[0033] Compared with the prior art, the artificial intelligence-based online monitoring system for drilling fluid density described in the present invention has the following beneficial effects: 1. The present invention comprehensively analyzes the suitable density of drilling fluid by combining the main factors affecting the density of drilling fluid, such as formation pressure and well wall stability, and the secondary factors affecting the density of drilling fluid, such as suspended rock cuttings, heat generated by drill bit operation, and transmitted water power, thereby improving the reliability of the analysis results of the suitable density of drilling fluid, so that the density of drilling fluid is better adapted to the drilling operation conditions, thereby ensuring the safety and efficiency of drilling operations.

[0034] 2. The present invention uses a large amount of historical drilling fluid density data and corresponding pressure, temperature, flow rate and other data as training samples, and utilizes a machine learning algorithm to construct a drilling fluid density calculation model, thereby being able to accurately calculate the drilling fluid density based on the newly collected data, thereby achieving real-time and precise monitoring of the drilling fluid density.

[0035] 3. The present invention adaptively adjusts the density of the drilling fluid based on the appropriate density and actual density of the drilling fluid, so that the drilling fluid can fully play its role, so as to timely adjust the drilling operation parameters, thereby effectively reducing the probability of drilling accidents such as blowouts and well leakage, thereby ensuring the life safety of drilling operators and the safety of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 This is a system module connection diagram of the present invention.

[0038] Figure 2 This is a structural block diagram of the drilling fluid suitable density analysis of the present invention.

[0039] Figure 3 This is a structural block diagram of the drilling fluid current density monitoring system of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1 As shown, the present invention provides an online monitoring system for drilling fluid density based on artificial intelligence, including a drilling fluid density first associated information acquisition module, a drilling fluid suitable density preliminary analysis module, a drilling fluid density second associated information acquisition module, a drilling fluid suitable density compensation correction module, a drilling fluid current density monitoring module, a drilling fluid density adjustment demand judgment module, a drilling fluid density adaptive adjustment module, and a database.

[0042] The drilling fluid suitable density preliminary analysis module is respectively connected to the drilling fluid density first associated information acquisition module and the drilling fluid density second associated information acquisition module, the drilling fluid suitable density compensation correction module is respectively connected to the drilling fluid density second associated information acquisition module and the drilling fluid current density monitoring module, the drilling fluid density adjustment demand judgment module is respectively connected to the drilling fluid current density monitoring module and the drilling fluid density adaptive adjustment module, and the database is respectively connected to the drilling fluid density first associated information acquisition module, the drilling fluid suitable density preliminary analysis module, the drilling fluid density second associated information acquisition module and the drilling fluid current density monitoring module.

[0043] The drilling fluid density first associated information acquisition module is used to acquire first associated information of the drilling fluid density, wherein the first associated information includes the formation pressure and wellbore stability of the drilling.

[0044] Further, see Figure 2 As shown, the specific working process of the drilling fluid density first associated information acquisition module is: A1: Detecting the formation pressure of the drilling through the instrument.

[0045] In a specific embodiment, the formation pressure of the wellbore is obtained by direct measurement methods such as drill string testing, repeated formation testers or modular formation dynamic testers.

[0046] In another specific embodiment, the formation pressure of the well is obtained by an indirect measurement method such as a DC index method and a shale density method.

[0047] A2: Obtain the type of downhole rock, extract the mechanical property information of each type of rock stored in the database, and screen to obtain the mechanical property information of the downhole rock, wherein the mechanical property information includes compressive strength, tensile strength, shear strength, elastic modulus and Poisson's ratio.

[0048] Detect the formation pore pressure, formation pore pressure gradient, formation tectonic stress, and formation tectonic stress direction of drilling.

[0049] The drilling operation parameters are obtained, wherein the operation parameters include drilling pressure and rotation speed.

[0050] The mechanical property information of the downhole rock, the drilling operation parameters, the drilling formation pore pressure, the formation pore pressure gradient, the formation tectonic stress, and the formation tectonic stress direction are substituted into the preset analytical formula of the drilling wellbore stability to obtain the drilling wellbore stability.

[0051] As a preferred solution, the compressive strength, tensile strength and shear strength of the rock are key factors affecting the stability of the wellbore. For example, rocks with low compressive strength are more likely to be damaged when subjected to the pressure in the well.

[0052] As a preferred solution, the elastic modulus reflects the ability of rock to resist elastic deformation, while Poisson's ratio describes the deformation relationship of rock under lateral and axial forces. Both are very important for analyzing the deformation behavior of wellbore rock under stress. For example, rocks with high elastic modulus deform less under the same stress, which is conducive to wellbore stability.

[0053] As a preferred solution, the formation pore pressure is closely related to the stability of the wellbore. If the formation pore pressure is too high, the wellbore rock will be subjected to a large outward pressure, which may easily lead to the collapse of the wellbore.

[0054] As a preferred solution, the formation pore pressure gradient reflects the change of formation pore pressure with depth. When the formation pore pressure gradient is abnormal, such as the presence of abnormally high pressure formations, it will have a serious impact on the stability of the wellbore.

[0055] As a preferred solution, tectonic stress is the stress generated in the stratum due to geological tectonic movement. The magnitude and direction of tectonic stress are crucial for evaluating the stability of the wellbore. For example, in the direction where the horizontal stress is greater, the wellbore is more likely to break or deform.

[0056] As a preferred solution, when the drilling pressure during drilling operation is too high, the drill bit will generate a large impact force and shear force on the well wall rock, destroying the original structure of the well wall rock and causing the well wall to become unstable.

[0057] As a preferred solution, too high a rotation speed in drilling operations will increase the friction between the drill bit and the wellbore rock, generate excessive heat, and may change the physical properties of the wellbore rock and affect the wellbore stability. At the same time, high-speed rotation will also cause greater vibration and impact on the wellbore wall.

[0058] As a preferred solution, the first associated information of the drilling fluid density is the main basis for analyzing the suitable density of the drilling fluid.

[0059] The drilling fluid suitable density preliminary analysis module is used to obtain historical drilling project operation information, respectively construct relationship models between drilling formation pressure and wellbore stability and drilling fluid density, and preliminarily analyze the suitable density of drilling fluid based on the first associated information of drilling fluid density.

[0060] Furthermore, the specific working process of the drilling fluid suitable density preliminary analysis module includes: extracting the historical drilling project operation information stored in the database, obtaining the formation pressure and wellbore stability of each historical drilling operation and the corresponding drilling fluid density.

[0061] Based on the single variable principle, a coordinate system is established with formation pressure as the independent variable and drilling fluid density as the dependent variable. According to the formation pressure and the corresponding drilling fluid density of each historical drilling operation, the corresponding data points are marked in the coordinate system. The trend curve of the drilling fluid density changing with the formation pressure is drawn by using the method of establishing a mathematical model. The function corresponding to the trend curve of the drilling fluid density changing with the formation pressure is obtained, and the relationship model between the formation pressure and the drilling fluid density is constructed.

[0062] Similarly, according to the method of constructing the relationship model between the formation pressure of drilling and the density of drilling fluid, the relationship model between the wellbore stability of drilling and the density of drilling fluid is constructed.

[0063] As a preferred solution, the function corresponding to the trend curve of the drilling fluid density changing with the formation pressure is an increasing function.

[0064] As a preferred solution, the function corresponding to the trend curve of the change of drilling fluid density with wellbore stability is a decreasing function.

[0065] Furthermore, the specific working process of the drilling fluid suitable density preliminary analysis module also includes: substituting the drilling formation pressure into the relationship model between the drilling formation pressure and the drilling fluid density to obtain the first reference density of the drilling fluid.

[0066] The relationship model between the wellbore stability and the drilling fluid density is used to obtain the second reference density of the drilling fluid.

[0067] The weighted average value of the first reference density and the second reference density of the drilling fluid is calculated to obtain the appropriate density of the drilling fluid.

[0068] As a preferred solution, the weights of the first reference density and the second reference density of the drilling fluid are set values, and the cumulative sum is 1.

[0069] In another specific embodiment, formation pressure and wellbore stability are used as independent variables, and drilling fluid density is used as dependent variable. According to the formation pressure and wellbore stability of each historical drilling operation and the corresponding drilling fluid density, a machine learning algorithm is used to analyze the relationship function between formation pressure and wellbore stability and drilling fluid density, and a relationship model between the formation pressure and wellbore stability of drilling and the drilling fluid density is constructed. Based on the first correlation information of the drilling fluid density, the formation pressure and wellbore stability of drilling are substituted into the relationship model between the formation pressure and wellbore stability of drilling and the drilling fluid density to obtain the appropriate density of the drilling fluid.

[0070] As a preferred solution, there are different pressures in the formation. If the formation pressure is greater than the pressure in the wellbore, the formation fluid may invade the wellbore and cause serious accidents such as blowouts. Conversely, if the pressure in the wellbore is too high, the formation may be fractured. At this time, it is necessary to adjust the drilling fluid density to generate a suitable liquid column pressure to balance the formation pressure and ensure drilling safety. In order to balance the formation pressure and prevent accidents such as blowouts, the formation pressure is an important basis for adjusting the drilling fluid density. When the formation pressure is high, the drilling fluid density needs to be increased to prevent the formation fluid from invading the wellbore and causing accidents such as blowouts. In areas with lower formation pressure, if the drilling fluid density is too high, the formation may be fractured, resulting in well leakage. At this time, the drilling fluid density needs to be reduced.

[0071] As a preferred solution, the drilling fluid can form a layer of mud cake on the well wall, which can block the pores and cracks of the well wall, prevent the invasion of formation fluids, and provide a certain support force to the well wall. The appropriate density of drilling fluid helps to maintain the stability of the well wall. If the density is too low, the drilling fluid will not be able to support the well wall enough, which may easily lead to well wall collapse; if the density is too high, it may fracture the formation and cause formation damage.

[0072] The drilling fluid density second associated information acquisition module is used to acquire second associated information of the drilling fluid density, wherein the second associated information includes drilling cuttings density, drill bit heat, and required transfer water power.

[0073] Furthermore, the specific working process of the second associated information acquisition module of the drilling fluid density is: sampling the drilling cuttings, obtaining the types of the drilling cuttings, extracting the density of each type of cuttings stored in the database, screening and obtaining the drilling cuttings density, and recording it as .

[0074] According to the drilling operation parameters, the drilling pressure and speed are obtained, and they are substituted into the preset relationship function between the drilling pressure and speed and the drill bit heat to obtain the drilling bit heat, which is recorded as .

[0075] Obtain the hydraulic power required for drilling operation, record it as the required hydraulic power for drilling, record it as .

[0076] In a specific embodiment, the required hydraulic power for drilling is set by the drilling operator.

[0077] As a preferred solution, the second associated information of the drilling fluid density is a secondary basis for analyzing the suitable density of the drilling fluid.

[0078] As a preferred solution, during the drilling process, the drill bit will break the rock and produce rock cuttings. The drilling fluid can carry these rock cuttings from the bottom of the well to the surface, keep the bottom of the well clean, and prevent the rock cuttings from accumulating at the bottom of the well and affecting the drill bit's continued drilling. At the same time, when the drilling circulation stops, the drilling fluid can suspend the rock cuttings so that they will not sink quickly and cause underground accidents such as drill sticking.

[0079] As a preferred solution, the drill bit will generate a lot of heat during high-speed rotation and drilling, and the drilling fluid can absorb this heat during the circulation process to cool the drill bit. In addition, the drilling fluid can also lubricate the drill bit and drilling tools, reduce friction between them, reduce wear, extend the service life of the drill bit and drilling tools, and improve drilling efficiency.

[0080] As a preferred solution, during the circulation process, the drilling fluid is pressurized by the mud pump on the ground, transferring energy to the bottom of the well and transmitting hydrodynamic force. This hydrodynamic force helps to improve the rock breaking efficiency of the drill bit and drive the downhole tools to work. It can also clean the bottom of the well, allowing the drill bit to better break the rock.

[0081] The drilling fluid suitable density compensation correction module is used to analyze the compensation amount of the drilling fluid suitable density according to the second associated information of the drilling fluid density, and correct the suitable density of the drilling fluid.

[0082] Furthermore, the specific working process of the drilling fluid suitable density compensation correction module includes: , drill bit heat , demand transfer water power Substitute into the analysis formula Get the influencing factors of drilling fluid density ,in Indicates the correction coefficient of the preset drilling fluid density influence factor, represents a natural constant, They represent the preset cuttings density, drill bit heat and the threshold value of required water power transmission, respectively. They represent the weight factors of the preset cuttings density, drill bit heat and required hydraulic power, respectively. As a preferred solution, the density of drilling fluid will affect its ability to carry cuttings. If the density of drilling fluid is too low, it may not be able to effectively carry cuttings out of the wellhead, resulting in the accumulation of cuttings in the well; if the density of drilling fluid is too high, although it may help carry cuttings, it may also cause damage to the formation.

[0083] As a preferred solution, the drilling fluid has the function of cooling the drill bit during the drilling process. Drilling fluids with higher density usually have better thermal conductivity and thermal physical properties such as specific heat capacity. High-density drilling fluids can absorb more heat and carry it away, thereby effectively reducing the heat generated by the drill bit. On the contrary, drilling fluids with lower density may be less effective in cooling the drill bit, making it difficult to dissipate the heat of the drill bit, easily causing the drill bit to overheat, affecting the service life of the drill bit and reducing drilling efficiency.

[0084] As a preferred solution, the drilling fluid needs to transmit water power during the drilling process to achieve functions such as hydraulic energy supply to the drill bit and carrying rock cuttings. A higher density drilling fluid usually means more mass per unit volume, which is conducive to transmitting greater water power. For example, in jet drilling, high-density drilling fluid can spray the drilling fluid to the bottom of the well at a higher pressure, thereby improving the rock breaking efficiency of the drill bit; in terms of rock carrying, high-density drilling fluid has a larger mass and inertia, and can generate greater water power when flowing in the annulus to carry rock cuttings to the ground.

[0085] Furthermore, the specific working process of the drilling fluid suitable density compensation correction module also includes: Substitute into the analysis formula Get the compensation amount of the appropriate density of drilling fluid ,in Indicates the unit compensation amount of the preset drilling fluid density.

[0086] The suitable density of the drilling fluid obtained by preliminary analysis is accumulated with the compensation amount of the suitable density of the drilling fluid, and then the suitable density of the drilling fluid is corrected.

[0087] It should be noted that the present invention comprehensively analyzes the suitable density of the drilling fluid by combining the main factors affecting the density of the drilling fluid, such as formation pressure and wellbore stability, and the secondary factors affecting the density of the drilling fluid, such as suspended cuttings, heat generated by the drill bit operation, and transmitted water power, so as to improve the reliability of the analysis results of the suitable density of the drilling fluid, thereby making the density of the drilling fluid better adapted to the drilling operation conditions, thereby ensuring the safety and efficiency of the drilling operation.

[0088] The drilling fluid current density monitoring module is used to collect the current drilling fluid pressure, temperature and flow rate through sensors, and obtain historical drilling fluid density data and the corresponding drilling fluid pressure, temperature and flow rate, and use machine learning algorithms to build a drilling fluid density calculation model to further analyze the current drilling fluid density.

[0089] Further, see Figure 3 As shown, the specific working process of the drilling fluid current density monitoring module is: extract the historical drilling fluid density data and the corresponding drilling fluid pressure, temperature, and flow rate stored in the database, use them as training samples for the drilling fluid density calculation model, use machine learning algorithms to analyze the relationship between the drilling fluid density and the drilling fluid pressure, temperature, and flow rate, and construct a drilling fluid density calculation model.

[0090] The pressure sensor is used to measure the pressure of the drilling fluid at each set point, and the average value is calculated to obtain the current pressure of the drilling fluid.

[0091] The current drilling fluid temperature is measured by a temperature sensor.

[0092] The current flow rate of drilling fluid is measured by a flow sensor.

[0093] Substitute the current drilling fluid pressure, temperature and flow rate into the drilling fluid density calculation model to obtain the current drilling fluid density.

[0094] As a preferred solution, according to the hydrostatic pressure formula, there is a direct correlation between the pressure and density of the drilling fluid. Accurately measuring the pressure of the drilling fluid can provide an important basis for calculating the density of the drilling fluid.

[0095] As a preferred solution, the temperature of the drilling fluid has a significant effect on the density of the drilling fluid. As the temperature of the drilling fluid increases, the volume of the drilling fluid will expand. According to the definition of density, if the mass remains unchanged, the increase in volume leads to a decrease in density. When drilling in deep wells or areas rich in geothermal resources, the temperature of the drilling fluid varies greatly, and this effect is more obvious.

[0096] As a preferred solution, the change in the flow rate of the drilling fluid may indicate a change in the density of the drilling fluid. For example, in some cases, when the solid particle content in the drilling fluid changes or other substances are mixed into the drilling fluid, the flow rate will change accordingly.

[0097] As a preferred solution, a high-speed and stable data transmission protocol, such as industrial Ethernet or wireless communication protocol, is used to transmit the current drilling fluid pressure, temperature, and flow data collected by the sensor to the data processing center, thereby ensuring the real-time and accuracy of data transmission, avoiding data loss or delay, and enabling drilling operations to make relevant decisions based on the latest monitoring data.

[0098] As a preferred solution, the raw data of the current drilling fluid pressure, temperature and flow rate collected by the sensor are cleaned, denoised, normalized and other operations are performed to improve the quality of the data.

[0099] In another specific embodiment, the drilling fluid density can also be calculated based on the hydrostatic pressure formula. For a static drilling fluid column, there is a relationship between its hydrostatic pressure and the drilling fluid density, the height of the liquid column and the acceleration of gravity. That is, in practical applications, if the hydrostatic pressure at a certain depth can be measured, the drilling fluid density can be calculated.

[0100] In another specific embodiment, the density of the drilling fluid may also be directly measured using a densitometer, such as a drilling fluid densitometer based on the buoyancy principle or the radioactivity principle.

[0101] It should be noted that the present invention uses a large amount of historical drilling fluid density data and corresponding pressure, temperature, flow rate and other data as training samples, and utilizes a machine learning algorithm to construct a drilling fluid density calculation model, thereby being able to accurately calculate the drilling fluid density based on the newly collected data, thereby achieving real-time and precise monitoring of the drilling fluid density.

[0102] The drilling fluid density adjustment requirement judgment module is used to analyze the matching index of the drilling fluid density according to the suitable density of the drilling fluid and the current density of the drilling fluid, and to judge whether the density of the drilling fluid needs to be adjusted. If adjustment is required, the drilling fluid density adaptive adjustment module is executed.

[0103] Furthermore, the specific working process of the drilling fluid density adjustment demand judgment module is as follows: the suitable density of the drilling fluid and the current density of the drilling fluid are recorded as By analyzing the formula Get the matching index of drilling fluid density, in Indicates the preset drilling fluid density Correction factor for the degree matching index, Indicates the deviation threshold between the preset current density of drilling fluid and the appropriate density. The matching index of the drilling fluid density is compared with a preset matching index threshold. If the matching index of the drilling fluid density is less than the preset matching index threshold, the density of the drilling fluid needs to be adjusted, and the drilling fluid density adaptive adjustment module is executed.

[0104] The drilling fluid density adaptive adjustment module is used to obtain adjustment information of the drilling fluid density, wherein the adjustment information includes an adjustment direction and an adjustment amount, and to provide feedback.

[0105] Furthermore, the specific working process of the drilling fluid density adaptive adjustment module is: compare the current drilling fluid density with the appropriate density of the drilling fluid. If the current drilling fluid density is greater than the appropriate density of the drilling fluid, the adjustment direction of the drilling fluid density is to decrease; if the current drilling fluid density is less than the appropriate density of the drilling fluid, the adjustment direction of the drilling fluid density is to increase.

[0106] The absolute value of the difference between the current drilling fluid density and the appropriate drilling fluid density is used as the adjustment amount of the drilling fluid density.

[0107] According to the adjustment direction and adjustment amount of the drilling fluid density, the adjustment information of the drilling fluid density is obtained and fed back to the drilling operation supervisor.

[0108] As a preferred solution, the density of the drilling fluid is adjusted by changing the proportion of the solid phase such as weighting material, clay, etc. or the liquid phase such as water, oil, etc. in the drilling fluid.

[0109] It should be noted that the present invention adaptively adjusts the density of the drilling fluid based on the appropriate density and actual density of the drilling fluid, so that the drilling fluid can fully play its role, so as to timely adjust the drilling operation parameters, thereby effectively reducing the probability of drilling accidents such as blowouts and well leakage, thereby ensuring the life safety of drilling operators and the safety of equipment.

[0110] The database is used to store mechanical property information of various types of rocks, historical drilling project operation information, density of various types of rock cuttings, and store historical drilling fluid density data and corresponding drilling fluid pressure, temperature, and flow rate.

[0111] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. An online monitoring system for drilling fluid density based on artificial intelligence, characterized in that: include: A drilling fluid density first associated information acquisition module: used to acquire first associated information of drilling fluid density, wherein the first associated information includes formation pressure and wellbore stability during drilling; Drilling fluid suitable density preliminary analysis module: used to obtain historical drilling project operation information, respectively build the relationship model between the formation pressure and wellbore stability of the drilling and the drilling fluid density, and preliminarily analyze the suitable density of the drilling fluid based on the first correlation information of the drilling fluid density; Drilling fluid density second associated information acquisition module: used to acquire second associated information of drilling fluid density, wherein the second associated information includes drilling cuttings density, drill bit heat, and required transfer water power; Drilling fluid suitable density compensation correction module: used to analyze the compensation amount of the drilling fluid suitable density according to the second associated information of the drilling fluid density, and correct the suitable density of the drilling fluid; Drilling fluid current density monitoring module: used to collect the current drilling fluid pressure, temperature and flow rate through sensors, and obtain historical drilling fluid density data and the corresponding drilling fluid pressure, temperature and flow rate, and use machine learning algorithms to build a drilling fluid density calculation model to further analyze the current drilling fluid density; Drilling fluid density adjustment demand judgment module: used to analyze the matching index of drilling fluid density according to the appropriate density of drilling fluid and the current density of drilling fluid, and judge whether the density of drilling fluid needs to be adjusted. If adjustment is required, the drilling fluid density adaptive adjustment module is executed; Drilling fluid density adaptive adjustment module: used to obtain adjustment information of drilling fluid density, where the adjustment information includes adjustment direction and adjustment amount, and provide feedback; Database: used to store mechanical property information of various types of rocks, historical drilling project operation information, density of various types of rock cuttings, and store historical drilling fluid density data and corresponding drilling fluid pressure, temperature, and flow rate; The specific working process of the first associated information acquisition module of drilling fluid density is as follows: A1: Detect the formation pressure of drilling through instruments; A2: Obtain the type of underground rock, extract the mechanical property information of each type of rock stored in the database, and screen to obtain the mechanical property information of the underground rock, wherein the mechanical property information includes compressive strength, tensile strength, shear strength, elastic modulus and Poisson's ratio; Detecting the formation pore pressure, formation pore pressure gradient, formation tectonic stress, and formation tectonic stress direction of drilling; Acquire drilling operation parameters, wherein the operation parameters include drilling pressure and rotation speed; Substituting the mechanical property information of the downhole rock, the drilling operation parameters, the formation pore pressure, the formation pore pressure gradient, the formation tectonic stress, and the formation tectonic stress direction of the drilling into the preset analysis formula of the wellbore stability of the drilling well, the wellbore stability of the drilling well is obtained; The specific working process of the second associated information acquisition module of drilling fluid density is as follows: Sample the drilling cuttings, obtain the types of drilling cuttings, extract the density of each type of cuttings stored in the database, screen and obtain the drilling cuttings density, which is recorded as ; According to the drilling operation parameters, the drilling pressure and speed are obtained, and they are substituted into the preset relationship function between the drilling pressure and speed and the drill bit heat to obtain the drilling bit heat, which is recorded as ; Obtain the hydraulic power required for drilling operation, record it as the required hydraulic power for drilling, record it as ; The specific working process of the drilling fluid suitable density compensation correction module includes: The density of drilling cuttings , drill bit heat , demand transfer water power Substitute into the analysis formula Get the influencing factors of drilling fluid density ,in Indicates the correction coefficient of the preset drilling fluid density influence factor, represents a natural constant, They represent the preset cuttings density, drill bit heat and the threshold value of required water power transmission, respectively. They represent the weight factors of the preset cuttings density, drill bit heat and required hydraulic power, respectively. ; The specific working process of the drilling fluid suitable density compensation correction module also includes: The influencing factors of drilling fluid density Substitute into the analysis formula Get the compensation amount of the appropriate density of drilling fluid ,in Indicates the unit compensation amount of the preset drilling fluid density; The appropriate density of the drilling fluid analyzed initially and the compensation amount of the appropriate density of the drilling fluid are accumulated, and then the appropriate density of the drilling fluid is corrected; The specific working process of the drilling fluid density adjustment demand judgment module is as follows: The suitable density of drilling fluid and the current density of drilling fluid are respectively denoted as , by analyzing the formula Get the matching index of drilling fluid density ,in Indicates the correction factor of the preset drilling fluid density matching index, Indicates the deviation threshold between the preset current density of the drilling fluid and the appropriate density; The matching index of the drilling fluid density is compared with a preset matching index threshold. If the matching index of the drilling fluid density is less than the preset matching index threshold, the density of the drilling fluid needs to be adjusted, and the drilling fluid density adaptive adjustment module is executed.

2. The online monitoring system for drilling fluid density based on artificial intelligence according to claim 1, characterized in that: The specific working process of the drilling fluid suitable density preliminary analysis module includes: Extract the historical drilling project operation information stored in the database to obtain the formation pressure and wellbore stability of each historical drilling operation and the corresponding drilling fluid density; Based on the single variable principle, a coordinate system is established with formation pressure as the independent variable and drilling fluid density as the dependent variable. According to the formation pressure and corresponding drilling fluid density of each historical drilling operation, the corresponding data points are marked in the coordinate system. The trend curve of drilling fluid density changing with formation pressure is drawn by using the method of establishing a mathematical model, and the function corresponding to the trend curve of drilling fluid density changing with formation pressure is obtained, so as to construct a relationship model between formation pressure and drilling fluid density during drilling. Similarly, according to the method of constructing the relationship model between the formation pressure of drilling and the density of drilling fluid, the relationship model between the wellbore stability of drilling and the density of drilling fluid is constructed.

3. The online monitoring system for drilling fluid density based on artificial intelligence according to claim 1, characterized in that: The specific working process of the drilling fluid suitable density preliminary analysis module also includes: Substituting the formation pressure of the drilling well into the relationship model between the formation pressure of the drilling well and the density of the drilling fluid to obtain the first reference density of the drilling fluid; A relationship model between the wellbore stability of the wellbore and the density of the drilling fluid is used to obtain a second reference density of the drilling fluid; The weighted average value of the first reference density and the second reference density of the drilling fluid is calculated to obtain the appropriate density of the drilling fluid.

4. The online monitoring system for drilling fluid density based on artificial intelligence according to claim 1, characterized in that: The specific working process of the drilling fluid current density monitoring module is as follows: The historical drilling fluid density data and the corresponding drilling fluid pressure, temperature, and flow rate stored in the database are extracted and used as training samples for the drilling fluid density calculation model. The relationship between the drilling fluid density and the drilling fluid pressure, temperature, and flow rate is analyzed using a machine learning algorithm to construct a drilling fluid density calculation model. The pressure sensor measures the pressure of the drilling fluid at each set point, and calculates the average value to obtain the current pressure of the drilling fluid; Measure the current temperature of the drilling fluid through a temperature sensor; The current flow rate of drilling fluid is measured by a flow sensor; Substitute the current drilling fluid pressure, temperature and flow rate into the drilling fluid density calculation model to obtain the current drilling fluid density.

5. The online monitoring system for drilling fluid density based on artificial intelligence according to claim 1, characterized in that: The specific working process of the drilling fluid density adaptive adjustment module is as follows: Compare the current density of the drilling fluid with the appropriate density of the drilling fluid. If the current density of the drilling fluid is greater than the appropriate density of the drilling fluid, the adjustment direction of the drilling fluid density is to decrease. If the current density of the drilling fluid is less than the appropriate density of the drilling fluid, the adjustment direction of the drilling fluid density is to increase. The absolute value of the difference between the current drilling fluid density and the appropriate drilling fluid density is used as the adjustment amount of the drilling fluid density; According to the adjustment direction and adjustment amount of the drilling fluid density, the adjustment information of the drilling fluid density is obtained and fed back to the drilling operation supervisor.

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