Drilling hydraulic model correction method based on measurement while drilling technology

Abstract

The invention belongs to the technical field of petroleum drilling engineering, particularly relates to a drilling hydraulic model correction method based on a measurement-while-drilling technology, and aims to solve the problem that prediction precision is difficult to further improve by a correction method in the prior art. The method comprises the following steps: measuring the temperature and pressure of drilling fluid in a drill column at an underground measuring point position and the temperature and pressure of annular drilling fluid at the measuring point position by utilizing a PWD tool; the temperature and density of the entering drilling fluid, the temperature and density of the flowing-out drilling fluid, the standing pressure and the wellhead return pressure are measured; measuring the circulating pressure loss of the underground tool string; and correcting the predicted temperature and pressure profile of the shaft by using the measured data. According to the method, multiple correction parameters are considered, a correction result with higher precision can be provided, wellbore pressure prediction with higher precision is provided for pressure control drilling, and pressure control drilling is better supported.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling engineering, and in particular relates to a drilling hydraulic model correction method based on a while drilling measurement technology. Background Art

[0002] Accurately predicting the wellbore pressure profile is an important technical means to ensure drilling safety and is the basic support technology for managed pressure drilling, especially in drilling in formations with narrow safety density windows. It is also an important guarantee for managed pressure drilling in fixed-point well sections and is of great significance.

[0003] At present, in conventional drilling, hydraulic models are mainly used for preliminary design, and real-time prediction of drilling is mainly used for controlled pressure drilling. In the industry, the main method for correcting the hydraulic model of controlled pressure drilling is based on vertical pressure and a single correction parameter, and the correction parameter is adjusted to make the predicted vertical pressure equal to the measured vertical pressure ± allowable error; or in the patent with application number: CN104213906B, the invention name is: A method for correcting drilling wellbore pressure, based on the measurement while drilling technology, the reference value includes vertical pressure, the water hole pressure of the drill string at the measurement point while drilling, and the annular pressure at the measurement point while drilling. The correction parameters include the water hole correction parameter and the annular correction parameter. The correction parameters are adjusted during the drilling process to make the measured value equal to the measured value ± allowable error. The above method corrects the hydraulic model and improves the prediction accuracy of the bottom hole pressure, but does not consider the influence of the entire wellbore and formation, and is suitable for drilling in simple well conditions. As the formations for oil and gas exploration become more and more complex, the prediction accuracy of the drilling hydraulic model is required to be higher and higher, but the existing correction method is difficult to further improve the prediction accuracy.

[0004] Based on this, the present invention provides a drilling hydraulic model correction method based on the measurement while drilling technology. Summary of the invention

[0005] In order to solve the above-mentioned problem in the prior art, that is, the problem that the correction method in the prior art is difficult to further improve the prediction accuracy, the present invention provides a drilling hydraulic model correction method based on the measurement while drilling technology.

[0006] In one aspect of the present invention, a drilling hydraulic model correction method based on the measurement while drilling technology is used to correct the hydraulic prediction model and perform measurement while drilling parameter prediction after correction. The method comprises:

[0007] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0008] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0009] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated hydraulic prediction model;

[0010] According to the updated hydraulic prediction model, when the measured parameters change, the original parameters in the two-dimensional rheological parameter prediction model are corrected; and the updated hydraulic prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction;

[0011] The input data is input into the corresponding sub-model in the corrected hydraulic prediction model for prediction to obtain a prediction result; the input data includes the PWD annulus measurement temperature or the inlet drilling fluid measurement temperature or the wellhead back pressure or the vertical pressure; the prediction result includes the drilling water hole pressure or the drilling water hole temperature or the wellbore annulus pressure or the wellbore annulus temperature; the sub-models in the hydraulic model include the drilling water hole pressure prediction model, the drilling water hole temperature prediction model, the wellbore annulus pressure prediction model, and the wellbore annulus temperature prediction model.

[0012] In some preferred embodiments, the downhole tool string pressure loss and the downhole tool string lower end pressure loss are calculated as follows:

[0013] The test result parameters are mud density ρ, displacement Q, and vertical pressure value P s , pressure measured in the water hole P ti ; The vertical pressure value P s As the downhole tool string consumption pressure P ft , the pressure P in the water eye is measured ti As the pressure loss at the lower end of the downhole tool string P ft—down ;

[0014] The displacement Q is respectively used to control the downhole tool string consumption pressure P ft and the pressure loss P at the lower end of the downhole tool string ft—down Fitting is performed to obtain the downhole tool string pressure loss P ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q) Calculation formula:

[0015] P ft (Q) = a1 + b1 × Q + c1 × Q 2 ;

[0016] P ft-down(Q) = a2 + b2 × Q + c2 × Q 2 ;

[0017] Wherein, a1, b1, c1, a2, b2, c2 are fitting parameters;

[0018] According to the real-time measured displacement Q, the pressure loss P of the downhole tool string is inputted into the downhole tool string. ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q) In the calculation formula, the latest pressure loss P at the lower end of the tool string is obtained. ft—down and the downhole tool string pressure consumption P ft .

[0019] In some preferred embodiments, the original parameters include the annular drilling fluid density ρ a and / or the drilling fluid density in the drill string water hole ρ p and / or annular space temperature and / or drill string water hole temperature and / or bottom hole pressure and / or annular space pressure and / or drill string water hole pressure; wherein, the annular space drilling fluid density ρ a , and the correction method is:

[0020] Take n portions of drilling fluid containing cuttings returned from the wellbore, measure the volume v and mass m of the n portions of drilling fluid, calculate the density ρ=m / v of the n portions of drilling fluid, take the arithmetic mean of the density ρ of the n portions of drilling fluid as the annular drilling fluid density ρ a ;

[0021] The drilling fluid density in the drill string water hole ρ p The correction method is: measure the inlet drilling fluid density ρ in As the density of drilling fluid in the water hole of drill string, ρ p .

[0022] In some preferred embodiments, the annular space temperature is corrected by:

[0023] The PWD annulus temperature T ta As an input parameter, it is input into the wellbore annulus temperature prediction model in the updated hydraulic prediction model to obtain the annulus discrete point temperature T ai , the annular temperature is discretely divided into n parts along the axial direction, i=0, 1, 2, ..., n, wherein i represents the index of the calibration array;

[0024] The outlet drilling fluid temperature T out as the calibration value and divided by the preset predicted annular temperature T an , we get α n :

[0025]

[0026] The calibration parameter α from 1 to n-1 i Average assignment, the α i is a one-dimensional array of size n:

[0027]

[0028] Among them, the α 0 is 1, α 0 , α n Represents the first and last elements of the known calibration array;

[0029] The α i The temperature T of the discrete point in the annular space ai The product of is taken as the annular temperature;

[0030] The correction method of the drill string water hole temperature is:

[0031] The inlet drilling fluid temperature T in As an input parameter, it is input into the drill string water hole temperature prediction model in the updated hydraulic prediction model to obtain the temperature T of the drill string water hole space discrete point pi , the drill string water hole is discrete n parts along the axial direction, i = 0, 1, 2, ..., n;

[0032] The PWD water eye measures the temperature T ti As the calibration value, divided by the preset predicted water eye temperature T pn , we get β 0 :

[0033]

[0034] The calibration parameter β from 1 to n-1 i Average assignment, the β i is a one-dimensional array of size n:

[0035]

[0036] Among them, the β 0 is 1, β 0 , β n Represents the first and last elements of the known calibration array;

[0037] The β i With the T pi The product of is taken as the drill string water hole temperature.

[0038] In some preferred embodiments, the annular space pressure is corrected by:

[0039] Measure the wellhead back pressure P b, and use it as an input parameter to input into the wellbore annulus pressure prediction model in the updated hydraulic prediction model to obtain the annulus pressure discrete point pressure P ai , the annular pressure is discretely divided into n parts along the axial direction, i = 0, 1, 2, ..., n;

[0040] The PWD annular pressure Pta is used as the calibration parameter and divided by the set predicted pressure Pan to obtain ζ n :

[0041]

[0042] The calibration parameter ζ from 1 to n-1 i Average assignment, the ζ i is a one-dimensional array of size n;

[0043]

[0044] Among them, the 0 is 1, ζ 0 , n Represents the first and last elements of the known calibration array;

[0045] The said i and the P ai The product of is taken as the annular pressure;

[0046] In some preferred embodiments, the drill string water hole pressure is corrected by:

[0047] Measure the vertical pressure P s , and use it as an input parameter to input into the drilling water hole pressure prediction model in the updated hydraulic prediction model to obtain the drill string water hole pressure discrete point pressure P si , the drill string water hole pressure is discrete n parts along the axial direction, i = 0, 1, 2, ..., n;

[0048] The PWD water eye measures the pressure P ti As the calibration parameter, divided by the set predicted temperature P sn , we get η n :

[0049]

[0050] The calibration parameter η from 1 to n-1 i Average assignment, the η n is a one-dimensional array of size n;

[0051]

[0052] Among them, the η 0 =1,η0 , η n Represents the first and last elements of the known calibration array;

[0053] The η i and the P si The product of is taken as the drill string water pressure.

[0054] Another aspect of the present invention provides a method for predicting annular temperature based on a wellbore annular temperature prediction model, based on a drilling hydraulic model correction method based on a measurement while drilling technology, the method comprising:

[0055] Get the PWD annulus measured temperature as input data;

[0056] Based on the input data, a prediction result corresponding to the annular space temperature is obtained through a calibrated wellbore annular space temperature prediction model;

[0057] Among them, the correction method of the wellbore annulus temperature prediction model is:

[0058] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0059] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0060] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated wellbore annulus temperature prediction model;

[0061] The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained to correct the original parameters in the two-dimensional rheological parameter prediction model; the updated wellbore annulus temperature prediction model is corrected using the corrected two-dimensional rheological parameter prediction model; the original parameters are the annulus temperature.

[0062] In a third aspect of the present invention, a method for predicting the temperature of a drill string water hole based on a drilling water hole temperature prediction model is proposed, based on a drilling hydraulic model correction method based on a while drilling measurement technology, the method comprising:

[0063] Obtain the measured temperature of the inlet drilling fluid as input data;

[0064] Based on the input data, a prediction result corresponding to the drill string water hole temperature is obtained through a calibrated drilling water hole temperature prediction model;

[0065] Wherein, the drilling water hole temperature prediction model, its correction method is:

[0066] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0067] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0068] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated drilling water hole temperature prediction model;

[0069] Obtain the corrected original parameters in the two-dimensional rheological parameter prediction model, and use the two-dimensional rheological parameter prediction model after parameter correction to correct the updated drilling water hole temperature prediction model; the original parameters are the drill string water hole temperature

[0070] In a fourth aspect of the present invention, a method for predicting annular pressure based on a wellbore annular pressure prediction model is proposed, based on a drilling hydraulic model correction method based on a measurement while drilling technology, the method comprising:

[0071] Get the wellhead back pressure as input data;

[0072] Based on the input data, a prediction result corresponding to the annular pressure is obtained through a calibrated wellbore annular pressure prediction model;

[0073] Among them, the correction method of the wellbore annulus pressure prediction model is:

[0074] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0075] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0076] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated wellbore annulus pressure prediction model;

[0077] The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained, and the updated wellbore annulus pressure prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction; the original parameters are the annulus pressure.

[0078] In a fifth aspect, the present invention provides a method for predicting the water hole pressure of a drill string based on a drilling water hole pressure prediction model, based on a drilling hydraulic model correction method based on a measurement while drilling technology, the method comprising:

[0079] Get the vertical pressure as input data;

[0080] Based on the input data, a prediction result corresponding to the drill string water hole pressure is obtained through a calibrated drilling water hole pressure prediction model;

[0081] Wherein, the drilling water hole pressure prediction model, its correction method is:

[0082] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0083] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0084] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated drilling water hole pressure prediction model;

[0085] Obtain the corrected original parameters in the two-dimensional rheological parameter prediction model and replace the original parameters in the two-dimensional rheological parameter prediction model; use the two-dimensional rheological parameter prediction model after parameter correction to correct the updated drilling water hole pressure prediction model; the original parameters are the drill string water hole pressure.

[0086] Beneficial effects of the present invention:

[0087] Based on the PWD tool, the temperature and pressure of the drilling fluid in the drill string at the downhole measuring point, as well as the temperature and pressure of the drilling fluid in the annulus at the measuring point are measured; the temperature and density of the inlet drilling fluid, the temperature and density of the outflow drilling fluid, as well as the vertical pressure and wellhead back pressure and other data are measured. More basic parameters of the drilling hydraulic model can be corrected, and the wellbore pressure profile can be modified, which can achieve higher correction accuracy and meet the pressure control drilling requirements of more complex formations. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0089] Figure 1 It is a schematic diagram of the overall process of a drilling hydraulic model correction method based on the measurement while drilling technology of the present invention;

[0090] Figure 2 It is a specific flow chart of a drilling hydraulic model correction method based on the measurement while drilling technology of the present invention;

[0091] Figure 3 It is a schematic diagram of a drilling wellbore used in a drilling hydraulic model correction method based on the measurement while drilling technology of the present invention;

[0092] Figure 4 It is a schematic diagram of the fitting relationship between mud displacement and pressure loss in a drilling hydraulic model correction method based on the measurement while drilling technology of the present invention. DETAILED DESCRIPTION

[0093] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0094] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0095] The present invention provides a drilling hydraulic model correction method based on the measurement while drilling technology, which is used to correct the hydraulic prediction model and perform measurement while drilling parameter prediction after correction. The method comprises:

[0096] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0097] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0098] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated hydraulic prediction model;

[0099] According to the updated hydraulic prediction model, when the measured parameters change, the original parameters in the two-dimensional rheological parameter prediction model are corrected; and the updated hydraulic prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction;

[0100] The input data is input into the corresponding sub-model in the corrected hydraulic prediction model for prediction to obtain a prediction result; the input data includes the PWD annulus measurement temperature or the inlet drilling fluid measurement temperature or the wellhead back pressure or the vertical pressure; the prediction result includes the drilling water hole pressure or the drilling water hole temperature or the wellbore annulus pressure or the wellbore annulus temperature; the sub-models in the hydraulic model include the drilling water hole pressure prediction model, the drilling water hole temperature prediction model, the wellbore annulus pressure prediction model, and the wellbore annulus temperature prediction model.

[0101] In order to more clearly explain the drilling hydraulic model correction method based on the measurement while drilling technology of the present invention, the following is combined with Figure 1-4 Each step in the embodiment of the present invention is described in detail.

[0102] A drilling hydraulic model correction method based on the measurement while drilling technology in the first embodiment of the present invention, each step is described in detail as follows:

[0103] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0104] The calculation method of the downhole tool string pressure loss and the downhole tool string lower end pressure loss is:

[0105] The test result parameters are mud density ρ, displacement Q, and vertical pressure value P s , pressure measured in the water hole P ti ; The vertical pressure value P s As the downhole tool string consumption pressure P ft , the pressure P in the water eye is measured ti As the pressure loss at the lower end of the downhole tool string P ft—down ;

[0106] The displacement Q is respectively used to control the downhole tool string consumption pressure P ft and the pressure loss P at the lower end of the downhole tool string ft—down Fitting is performed to obtain the downhole tool string pressure loss P ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q) Calculation formula:

[0107] P ft (Q) = a1 + b1 × Q + c1 × Q 2 ;

[0108] P ft-down (Q) = a2 + b2 × Q + c2 × Q 2 ;

[0109] Among them, a1, b1, c1, a2, b2, c2 are fitting parameters. For specific fitting relationships, please refer to Figure 4 Graph of

[0110] According to the real-time measured displacement Q, the pressure loss P of the downhole tool string is inputted into the downhole tool string. ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q) In the calculation formula, the latest pressure loss P at the lower end of the tool string is obtained. ft—down and the downhole tool string pressure consumption P ft .

[0111] Among them, the drilling fluid and the upper and lower limits of the designed displacement ± floating value are used to carry out hydraulic testing of the downhole tool string, record the mud density ρ, displacement Q, and vertical pressure value Ps, and regard the vertical pressure Ps as the pressure consumption P of the downhole tool string. ft , PWD water eye measured pressure P ti Considered as the pressure loss at the lower end of the downhole tool string P ft—down. Using the recorded data, the pressure loss formula of the downhole tool string is fitted with the displacement as the variable. For example, 8 1 / 2” wellbore, 6 3 / 4” downhole tool string, designed displacement 28-32L / s, then the displacement Q can be divided into 26, 28, 30, 32, 34L / s, and the five values ​​are hydraulically tested to obtain Ps(26), Ps(28), Ps(30), Ps(32), Ps(34), and Ps(36) are measured. ti (26) P ti (28), P ti (30), P ti (32), P ti (34), the downhole tool string pressure loss P can be obtained by quadratic polynomial fitting as follows: ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q)Calculation formula.

[0112] In the present invention, the method for obtaining the hydrostatic column pressure is to smooth the borehole geometric parameters measured by MWD and update the borehole geometric calculation data. The well inclination and azimuth data are processed by interpolation method, such as quadratic strip interpolation, to obtain the geometric parameters of any well depth, calculate the vertical depth of a certain point x, and use it to calculate the hydrostatic column pressure P g (x), P g (x) = ρgh x .

[0113] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0114] Compared with the general rheological model, the present invention can obtain more accurate rheological parameters. For example, by measuring the shear stress of the drilling fluid at six speeds of 600, 300, 200, 100, 6, and 3 r / min, the relationship between the shear stress at different speeds and the corresponding pressure and temperature τ(P,T) can be obtained. ω .

[0115] The shear stress correspondence can be converted into rheological parameters of drilling fluid to calculate the flow friction coefficient γ(τ(P,T) ω ,v).

[0116] wherein the set temperature and the set pressure are subjected to a rheological test, the rheological test results are obtained and fitted to obtain a two-dimensional rheological parameter prediction model;

[0117] Obtain the shear stress of the drilling fluid at a set number of rotation speeds, fit the shear stress with the two-dimensional rheological parameter prediction model, and obtain the relationship between the shear stress and the pressure and temperature τ(P,T)ω ;

[0118] According to the τ(P,T) ω Calculate the flow friction coefficient γ(τ(P,T) ω , v), based on the γ(τ(P,T) ω , v) Calculate the flow friction and pressure loss:

[0119]

[0120] Wherein, i represents the discrete number of wellbore space, and γ i represents the flow friction coefficient of the discrete unit, the ρ i represents the drilling fluid density of discrete units, the D i Represents the hydraulic diameter of the discrete unit.

[0121] Among them, the step of "obtaining the shear stress of the drilling fluid at a set number of rotation speeds" is a prior art and will not be described in detail here.

[0122] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated hydraulic prediction model;

[0123] According to the updated hydraulic prediction model, when the measured parameters change, the original parameters in the two-dimensional rheological parameter prediction model are corrected; and the updated hydraulic prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction;

[0124] The measurement parameters include inlet drilling fluid density, outlet return drilling fluid density containing cuttings, outlet drilling fluid temperature, inlet drilling fluid temperature, wellhead back pressure, and measured vertical pressure.

[0125] Among them, the original parameters include the annular drilling fluid density ρ a and / or the drilling fluid density in the drill string water hole ρ p and / or annular space temperature and / or drill string water hole temperature and / or bottom hole pressure and / or annular space pressure and / or drill string water hole pressure; wherein, the annular space drilling fluid density ρ a , and the correction method is:

[0126] Take n portions of drilling fluid containing cuttings returned from the wellbore, measure the volume v and mass m of the n portions of drilling fluid, calculate the density ρ=m / v of the n portions of drilling fluid, take the arithmetic mean of the density ρ of the n portions of drilling fluid as the annular drilling fluid density ρ a ;

[0127] The sample taken to measure the density of the drilling fluid at the outlet includes the drilling fluid and the returned cuttings. The density of the returned drilling fluid containing cuttings ρ is calculated. out , the formula is

[0128]

[0129] In the formula, m r Indicates the mass of returned cuttings, m m It represents the mass of returned drilling fluid, and V represents the total volume of cuttings and drilling fluid.

[0130] Among them, after measuring the density of the drilling fluid in the annulus and the drilling fluid density in the water hole of the drill string, it is measured again at a certain interval to update the data. If the conditions are met, the rheological parameters of the drilling fluid at the outlet are measured and the parameters are used to update τ(P,T) ω A mirror model τ(P,T)′ ω The parameters are used as the rheological model of the annular drilling fluid to improve the prediction accuracy of the annular flow friction.

[0131] The drilling fluid density in the drill string water hole ρ p The correction method is: measure the inlet drilling fluid density ρ in As the density of drilling fluid in the water hole of drill string, ρ p .

[0132] If the conditions are met, measure the rheological parameters of the inlet drilling fluid and use them to update τ(P,T) ω Another mirror model τ(P,T)″ ω The parameters are used as the rheological model of the drilling fluid in the drill string to improve the prediction accuracy of the flow friction in the drill string.

[0133] Among them, the drilling fluid flow rate Q at the drill string inlet is measured, and the entire wellbore flow rate q is corrected w (t), i.e. q w (t) = Q.

[0134] The annular space temperature described in the present invention is corrected by:

[0135] The PWD annulus temperature T ta As an input parameter, it is input into the wellbore annulus temperature prediction model in the updated hydraulic prediction model to obtain the annulus discrete point temperature T ai , the annular temperature is discretely divided into n parts along the axial direction, i=0, 1, 2, ..., n, wherein i represents the index of the calibration array;

[0136] The outlet drilling fluid temperature T out as the calibration value and divided by the preset predicted annular temperature T an , we get α n :

[0137]

[0138] The calibration parameter α from 1 to n-1 i Average assignment, the α i is a one-dimensional array of size n:

[0139]

[0140] Among them, the α 0 is 1, α 0 , α n Represents the first and last elements of the known calibration array;

[0141] The α i The temperature T of the discrete point in the annular space ai The product of is taken as the annular temperature;

[0142] Due to the limitations of the upload rate and total data transmission volume of the MWD system, there will be a period of time between receiving each set of PWD measurement data on the ground. After each data update, the calibration parameter array α is used as the correction parameter until the next PWD measurement data update, when the correction parameter is updated again.

[0143] The correction method of the drill string water hole temperature is:

[0144] The inlet drilling fluid temperature T in As an input parameter, it is input into the drill string water hole temperature prediction model in the updated hydraulic prediction model to obtain the temperature T of the drill string water hole space discrete point pi , the drill string water hole is discrete n parts along the axial direction, i = 0, 1, 2, ..., n;

[0145] The PWD water eye measures the temperature T ti As the calibration value, divided by the preset predicted water eye temperature T pn , we get β 0 :

[0146]

[0147] The calibration parameter β from 1 to n-1 i Average assignment, the β i is a one-dimensional array of size n:

[0148]

[0149] Among them, the β 0 is 1, β 0 , β n Represents the first and last elements of the known calibration array;

[0150] The β i With the T pi The product of is taken as the drill string water hole temperature;

[0151] The bottom hole pressure P wd , and the correction method is:

[0152] P wd =P ti -P ft-down ;

[0153] Among them, the P ti To measure the pressure inside the water hole;

[0154] Annulus bottom hole pressure P′ fa , and the correction method is:

[0155] P ti -P ft-down =P ta +P′ fa ;

[0156] Then, the annular pressure gradient from the measuring point to the drill bit is:

[0157]

[0158] Where L is the length from the PWD measuring point to the drill bit, and PWD measures the water pressure P ti 、PWD measures the water eye temperature T ti 、PWD annulus measurement pressure P ta .

[0159] The annular space pressure is corrected by:

[0160] Measure the wellhead back pressure P b , and use it as an input parameter to input into the wellbore annulus pressure prediction model in the updated hydraulic prediction model to obtain the annulus pressure discrete point pressure P ai , the annular pressure is discretely divided into n parts along the axial direction, i = 0, 1, 2, ..., n;

[0161] The PWD annulus pressure P ta As the calibration parameter, divided by the set predicted pressure P an , we get n :

[0162]

[0163] The calibration parameter ζ from 1 to n-1 i Average assignment, the ζ i is a one-dimensional array of size n;

[0164]

[0165] Among them, the 0 is 1, ζ 0 , n Represents the first and last elements of the known calibration array;

[0166] The said i and the P ai The product of is taken as the annular pressure;

[0167] The correction method of the drill string water hole pressure is as follows:

[0168] Measure the vertical pressure P s , and use it as an input parameter to input into the drilling water hole pressure prediction model in the updated hydraulic prediction model to obtain the drill string water hole pressure discrete point pressure P si , the drill string water hole pressure is discrete n parts along the axial direction, i = 0, 1, 2, ..., n;

[0169] The PWD water eye measures the pressure P ti As the calibration parameter, divided by the set predicted temperature P sn , we get η n :

[0170]

[0171] The calibration parameter η from 1 to n-1 i Average assignment, the η i is a one-dimensional array of size n;

[0172]

[0173] Among them, the η 0 =1,η 0 , η n Represents the first and last elements of the known calibration array;

[0193] The η i and the P si The product of is taken as the drill string water pressure.

[0194] The calibration parameter array η is used as the correction parameter until the next PWD measurement data is updated and the correction parameter is updated again.

[0195] Among them, when the measured parameters change, the original parameters in the sub-models are corrected; the updated hydraulic prediction model is corrected using the original parameters after parameter correction, otherwise, the hydraulic model and the original parameters in its sub-models are still corrected using the last collected data for prediction calculation.

[0196] Among them, all the above pressures and temperatures are used for drilling fluid rheological parameters τ(P,T) after the update is completed ω Calculation, iterative calculation of cyclic friction, used for pressure loss calculation of time step.

[0197] Although the various steps in the above embodiment are described in the above-mentioned order, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reverse order. These simple changes are within the scope of protection of the present invention.

[0198] A second embodiment of the present invention provides an annular space temperature prediction method based on a wellbore annular space temperature prediction model, based on a drilling hydraulic model correction method based on a while drilling measurement technology, the method comprising:

[0199] Get the PWD annulus measured temperature as input data;

[0200] Based on the input data, a prediction result corresponding to the annular space temperature is obtained through a calibrated wellbore annular space temperature prediction model;

[0201] Among them, the correction method of the wellbore annulus temperature prediction model is:

[0202] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0203] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0204] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated wellbore annulus temperature prediction model;

[0203] The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained to correct the original parameters in the two-dimensional rheological parameter prediction model; the updated wellbore annulus temperature prediction model is corrected using the corrected two-dimensional rheological parameter prediction model; the original parameters are the annulus temperature.

[0204] A method for predicting the temperature of a drill string water hole based on a drilling water hole temperature prediction model according to a third embodiment of the present invention is based on a method for correcting a drilling hydraulic model based on a measurement while drilling technology. The method comprises:

[0205] Obtain the measured temperature of the inlet drilling fluid as input data;

[0206] Based on the input data, a prediction result corresponding to the drill string water hole temperature is obtained through a calibrated drilling water hole temperature prediction model;

[0207] Wherein, the drilling water hole temperature prediction model, its correction method is:

[0208] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0209] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0210] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated drilling water hole temperature prediction model;

[0211] Obtain the corrected original parameters in the two-dimensional rheological parameter prediction model, and use the two-dimensional rheological parameter prediction model after parameter correction to correct the updated drilling water hole temperature prediction model; the original parameters are the drill string water hole temperature

[0212] A fourth embodiment of the present invention provides an annular pressure prediction method based on a wellbore annular pressure prediction model, based on a drilling hydraulic model correction method based on a while drilling measurement technology, the method comprising:

[0213] Get the wellhead back pressure as input data;

[0214] Based on the input data, a prediction result corresponding to the annular pressure is obtained through a calibrated wellbore annular pressure prediction model;

[0215] Among them, the correction method of the wellbore annulus pressure prediction model is:

[0216] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0217] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0218] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated wellbore annulus pressure prediction model;

[0219] The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained, and the updated wellbore annulus pressure prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction; the original parameters are the annulus pressure.

[0220] A drill string water hole pressure prediction method based on a drilling water hole pressure prediction model according to a fifth embodiment of the present invention is based on a drilling hydraulic model correction method based on a while drilling measurement technology, and the method comprises:

[0221] Get the vertical pressure as input data;

[0222] Based on the input data, a prediction result corresponding to the drill string water hole pressure is obtained through a calibrated drilling water hole pressure prediction model;

[0223] Wherein, the drilling water hole pressure prediction model, its correction method is:

[0224] Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure;

[0225] The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained;

[0226] Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated drilling water hole pressure prediction model;

[0227] Obtain the corrected original parameters in the two-dimensional rheological parameter prediction model and replace the original parameters in the two-dimensional rheological parameter prediction model; use the two-dimensional rheological parameter prediction model after parameter correction to correct the updated drilling water hole pressure prediction model; the original parameters are the drill string water hole pressure.

[0228] The terms "first", "second", etc. are used to distinguish similar objects rather than to describe or indicate a particular order or sequence.

[0229] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0230] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A drilling hydraulic model correction method based on measurement while drilling technology, which is used to correct the hydraulic prediction model and perform measurement while drilling parameter prediction after correction, characterized in that: The method includes: Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure; The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained; Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated hydraulic prediction model; According to the updated hydraulic prediction model, when the measured parameters change during use, the original parameters in the two-dimensional rheological parameter prediction model are corrected; and the updated hydraulic prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction; The input data is input into the corresponding sub-model in the corrected hydraulic prediction model for prediction to obtain a prediction result; the input data includes the PWD annulus measurement temperature or the inlet drilling fluid measurement temperature or the wellhead back pressure or the vertical pressure; the prediction result includes the drilling water hole pressure or the drilling water hole temperature or the wellbore annulus pressure or the wellbore annulus temperature; the sub-models in the hydraulic model include the drilling water hole pressure prediction model, the drilling water hole temperature prediction model, the wellbore annulus pressure prediction model, and the wellbore annulus temperature prediction model.

2. The method for calibrating a drilling hydraulic model based on measurement while drilling technology according to claim 1, characterized in that: The calculation method of the downhole tool string pressure loss and the downhole tool string lower end pressure loss is: The test result parameters are mud density ρ, displacement Q, and vertical pressure value P s , pressure measured in the water hole P ti ; The vertical pressure value P s As the downhole tool string consumption pressure P ft , the pressure P in the water eye is measured ti As the pressure loss at the lower end of the downhole tool string P ft—down ; The displacement Q is respectively used to control the downhole tool string consumption pressure P ft and the pressure loss P at the lower end of the downhole tool string ft—down Fitting is performed to obtain the downhole tool string pressure loss P ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q) Calculation formula: P ft (Q)=a1+b1×Q+c1×Q 2 ; P ft-down (Q)=a2+b2×Q+c2×Q 2 ; Wherein, a1, b1, c1, a2, b2, c2 are fitting parameters; According to the real-time measured displacement Q, the pressure loss P of the downhole tool string is inputted into the downhole tool string. ft (Q) and the pressure loss at the lower end of the downhole tool string P ft—down (Q) In the calculation formula, the latest pressure loss P at the lower end of the tool string is obtained. ft—down and the downhole tool string pressure consumption P ft .

3. The method for calibrating a drilling hydraulic model based on measurement while drilling technology according to claim 2, characterized in that: The original parameters include annular drilling fluid density ρ a and / or the drilling fluid density in the drill string water hole ρ p and / or annular space temperature and / or drill string water hole temperature and / or bottom hole pressure and / or annular space pressure and / or drill string water hole pressure; wherein, the annular space drilling fluid density ρ a , and the correction method is: Take n portions of drilling fluid containing cuttings returned from the wellbore, measure the volume v and mass m of the n portions of drilling fluid, calculate the density ρ=m / v of the n portions of drilling fluid, take the arithmetic mean of the density ρ of the n portions of drilling fluid as the annular drilling fluid density ρ a ; The drilling fluid density in the drill string water hole ρ p The correction method is: measure the inlet drilling fluid density ρ in As the density of drilling fluid in the water hole of drill string, ρ p .

4. The method for calibrating a drilling hydraulic model based on measurement while drilling technology according to claim 3, characterized in that: The annular space temperature is corrected by: The PWD annulus temperature T ta As an input parameter, it is input into the wellbore annulus temperature prediction model in the updated hydraulic prediction model to obtain the annulus discrete point temperature T ai , the annular temperature is discretely divided into n parts along the axial direction, i=0, 1, 2, ..., n, wherein i represents the index of the calibration array; The outlet drilling fluid temperature T out as the calibration value and divided by the preset predicted annular temperature T an , we get α n : The calibration parameter α from 1 to n-1 i Average assignment, the α i is a one-dimensional array of size n: Wherein, α0 is 1, α0, α n Represents the first and last elements of the known calibration array; The α i The temperature T of the discrete point in the annular space ai The product of is taken as the annular temperature; The correction method of the drill string water hole temperature is: The inlet drilling fluid temperature T in As an input parameter, it is input into the drill string water hole temperature prediction model in the updated hydraulic prediction model to obtain the temperature T of the drill string water hole space discrete point pi , the drill string water hole is discrete n parts along the axial direction, i = 0, 1, 2, ..., n; The PWD water eye measures the temperature T ti As the calibration value, divided by the preset predicted water eye temperature T pn , we get β0: The calibration parameter β from 1 to n-1 i Average assignment, the β i is a one-dimensional array of size n: Wherein, β0 is 1, β0, β n Represents the first and last elements of the known calibration array; The β i The product of the temperature and Tpi is taken as the drill string water hole temperature.

5. The method for calibrating a drilling hydraulic model based on measurement while drilling technology according to claim 4, characterized in that: The annular space pressure is corrected by: Measure the wellhead back pressure P b , and use it as an input parameter to input into the wellbore annulus pressure prediction model in the updated hydraulic prediction model to obtain the annulus pressure discrete point pressure P ai , the annular pressure is discretely divided into n parts along the axial direction, i = 0, 1, 2, ..., n; The PWD annulus pressure P ta As the calibration parameter, divided by the set predicted pressure P an , we get n : The calibration parameter ζ from 1 to n-1 i Average assignment, the ζ i is a one-dimensional array of size n; Wherein, ζ0 is 1, ζ0, ζ n Represents the first and last elements of the known calibration array; The said i and the P ai The product of is taken as the annular pressure.

6. The method for calibrating a drilling hydraulic model based on measurement while drilling technology according to claim 5, characterized in that: The correction method of the drill string water hole pressure is as follows: Measure the vertical pressure P s , and use it as an input parameter to input into the drilling water hole pressure prediction model in the updated hydraulic prediction model to obtain the drill string water hole pressure discrete point pressure P si , the drill string water hole pressure is discrete n parts along the axial direction, i = 0, 1, 2, ..., n; The PWD water eye measures the pressure P ti As the calibration parameter, and divided by the set predicted temperature P sn , we get η n : The calibration parameter η from 1 to n-1 i Average assignment, the η i is a one-dimensional array of size n; Wherein, η0 is 1, η0, η n Represents the first and last elements of the known calibration array; i and the P si The product of is taken as the drill string water pressure.

7. A method for predicting annular space temperature based on a wellbore annular space temperature prediction model, based on a drilling hydraulic model correction method based on a while drilling measurement technology as claimed in any one of claims 1 to 6, characterized in that: The method includes: Get the PWD annulus measured temperature as input data; Based on the input data, a prediction result corresponding to the annular space temperature is obtained through a calibrated wellbore annular space temperature prediction model; Among them, the correction method of the wellbore annulus temperature prediction model is: Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure; The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained; Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated wellbore annulus temperature prediction model; The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained to correct the original parameters in the two-dimensional rheological parameter prediction model; the updated wellbore annulus temperature prediction model is corrected using the corrected two-dimensional rheological parameter prediction model; the original parameters are the annulus temperature.

8. A method for predicting the temperature of a drill string water hole based on a drilling water hole temperature prediction model, based on a drilling hydraulic model correction method based on a while drilling measurement technology as claimed in any one of claims 1 to 6, characterized in that: The method includes: Obtain the measured temperature of the inlet drilling fluid as input data; Based on the input data, a prediction result corresponding to the drill string water hole temperature is obtained through a calibrated drilling water hole temperature prediction model; Among them, the drilling water hole temperature prediction model, its correction method is: Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure; The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained; Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated drilling water hole temperature prediction model; The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained, and the updated drilling water hole temperature prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction; the original parameters are the drill string water hole temperature.

9. A method for predicting annular pressure based on a wellbore annular pressure prediction model, based on a drilling hydraulic model correction method based on measurement while drilling technology according to any one of claims 1 to 6, characterized in that: The method includes: Get the wellhead back pressure as input data; Based on the input data, a prediction result corresponding to the annular pressure is obtained through a calibrated wellbore annular pressure prediction model; Among them, the correction method of the wellbore annulus pressure prediction model is: Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure; The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained; Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated wellbore annulus pressure prediction model; The corrected original parameters in the two-dimensional rheological parameter prediction model are obtained, and the updated wellbore annulus pressure prediction model is corrected using the two-dimensional rheological parameter prediction model after parameter correction; the original parameters are the annulus pressure.

10. A method for predicting drill string water hole pressure based on a drilling water hole pressure prediction model, based on a drilling hydraulic model correction method based on a while drilling measurement technology as claimed in any one of claims 1 to 6, characterized in that: The method includes: Get the vertical pressure as input data; Based on the input data, a prediction result corresponding to the drill string water hole pressure is obtained through a calibrated drilling water hole pressure prediction model; Wherein, the drilling water hole pressure prediction model, its correction method is: Conduct hydraulic test on downhole tool string according to preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculation to obtain pressure loss of downhole tool string and pressure loss at the lower end of downhole tool string; interpolate inclined well data and azimuth data to obtain vertical depth data, and calculate static liquid column pressure; The MWD measured borehole geometry parameters are smoothed to obtain updated data for borehole geometry calculation; the drilling fluid is subjected to rheological tests at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and the two-dimensional rheological parameters are obtained; Based on the updated data of the wellbore geometry calculation, the downhole tool string pressure loss, the downhole tool string lower end pressure loss, the hydrostatic column pressure, and the two-dimensional rheological parameters, the hydraulic model preset parameters are updated to obtain an updated drilling water hole pressure prediction model; Obtain the corrected original parameters in the two-dimensional rheological parameter prediction model and replace the original parameters in the two-dimensional rheological parameter prediction model; use the two-dimensional rheological parameter prediction model after parameter correction to correct the updated drilling water hole pressure prediction model; the original parameters are the drill string water hole pressure.

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