A drilling hydraulics model correction method based on measurement-while-drilling technology

Abstract

The present application belongs to the technical field of oil drilling engineering, and particularly relates to a drilling hydraulics model correction method based on a measurement-while-drilling technology, and aims to solve the problem that the correction method of the prior art is difficult to further improve the prediction accuracy. The present application comprises the following steps: measuring the temperature and pressure of drilling fluid in a drill string and the temperature and pressure of annular drilling fluid at a measuring point position downhole by using a PWD tool; measuring the temperature and density of drilling fluid entering a well, the temperature and density of drilling fluid flowing out, and the standpipe pressure and wellhead back pressure; measuring the circulating pressure loss of a downhole tool string; and correcting the wellbore predicted temperature and pressure profile by using the above measurement data. The present application considers multiple correction parameters, and can provide a higher-precision correction result, so as to provide a higher-precision wellbore pressure prediction for pressure control drilling, and better support the pressure control drilling.

Description

Technical Field

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

[0002] Accurately predicting the wellbore pressure profile is a crucial technical tool for ensuring drilling safety and serves as a fundamental support technology for managed pressure drilling (MPD). This is particularly important for evaluating the equivalent density of the safety window while drilling when drilling in formations with a narrow safety density window. It also provides a crucial guarantee for managed pressure drilling in targeted well sections, thus being of great significance.

[0003] Currently, in conventional drilling, hydraulic models are primarily used for preliminary design, while real-time drilling predictions are primarily used for managed pressure drilling (MPD). The primary method for correcting hydraulic models in managed pressure drilling (MPD) in the industry is to use a single correction parameter based on vertical pressure. This correction parameter is adjusted to ensure that the predicted vertical pressure equals the measured vertical pressure ± the allowable error. Alternatively, in patent application number CN104213906B, entitled "A Method for Correcting Wellbore Pressure in Drilling," based on measurement-while-drilling technology, the baseline values ​​include vertical pressure, drill string waterhole pressure at the measurement-while-drilling point, and annular pressure at the measurement-while-drilling point. The correction parameters include a waterhole correction parameter and an annular correction parameter. During drilling, the correction parameters are adjusted to ensure that the measured value equals the measured value ± the allowable error. These methods correct the hydraulic model and improve the accuracy of bottomhole pressure predictions, but they do not consider the influence of the entire wellbore and formation, making them suitable for drilling in simple well conditions. As oil and gas exploration formations become increasingly complex, the demand for predictive accuracy in drilling hydraulic models is increasing, but existing correction methods struggle to further improve prediction accuracy.

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

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

[0007] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0008] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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 measurement 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 of 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 pressure consumption P ft , measure the pressure P in the water eye 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 correspond to the downhole tool string 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 pressure loss P at the lower end of the downhole tool string 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] The displacement Q measured in real time is input into the downhole tool string pressure loss P ft (Q) and pressure loss P at the lower end of the downhole tool string 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 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 parts of drilling fluid containing cuttings returned from the wellbore, measure the volume v and mass m of the n parts of drilling fluid, calculate the density ρ = m / v of the n parts of drilling fluid, and take the arithmetic mean of the density ρ of the n parts of drilling fluid as the annular drilling fluid density ρ a ;

[0021] The drilling fluid density ρ in the drill string water hole p The correction method is: measure the inlet drilling fluid density ρ in As the drilling fluid density in the drill string water hole 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 a calibration value, 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] Wherein, α0 is 1, α0, α n Indicates the first and last elements of the known calibration array;

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

[0030] The drill string water hole temperature is corrected as follows:

[0031] Measure 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 drill string water hole spatial discrete point temperature T pi , the drill string water hole is discrete n parts along the axial direction, i = 0, 1, 2, ..., n;

[0032] The PWD water hole measures the temperature T ti As the calibration value, divided by the preset predicted water eye temperature T pn , we get β0:

[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] Wherein, β0 is 1, β0, β n Indicates 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 pressure is corrected by:

[0039] Measure 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] Wherein, ζ0 is 1, ζ0, ζ n Indicates 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 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 a calibration parameter, and divided by the set predicted temperature P sn , and 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] Wherein, η0 is 1, η0, η n Indicates 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 space temperature based on a wellbore annular space temperature prediction model, and a method for correcting a drilling hydraulics model based on 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 the calibrated wellbore annular space temperature prediction model;

[0057] The correction method of the wellbore annulus temperature prediction model is as follows:

[0058] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0059] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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 preset parameters of the hydraulic model 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] A third aspect of the present invention provides a method for predicting the temperature of a drill string water hole based on a drilling water hole temperature prediction model, and a method for correcting a drilling hydraulic model based on measurement while drilling 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 the calibrated drilling water hole temperature prediction model;

[0065] The calibration method of the drilling water hole temperature prediction model is as follows:

[0066] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0067] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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] A fourth aspect of the present invention provides a method for predicting annular pressure based on a wellbore annular pressure prediction model, and a method for correcting a drilling hydraulics model based on 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 the calibrated wellbore annular pressure prediction model;

[0073] The correction method of the wellbore annulus pressure prediction model is as follows:

[0074] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0075] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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 drill string water hole pressure based on a drilling water hole pressure prediction model, and a method for correcting a drilling hydraulic model based on measurement while drilling technology, the method comprising:

[0079] Get 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 the calibrated drilling water hole pressure prediction model;

[0081] The drilling water hole pressure prediction model is calibrated as follows:

[0082] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0083] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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] The PWD tool measures 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. It also measures multiple data, including the inlet and outlet drilling fluid temperatures and densities, as well as the vertical pressure and wellhead back pressure. This allows for the correction of more basic parameters of the drilling hydraulics model and the modification of the wellbore pressure profile, achieving higher correction accuracy and meeting the requirements of managed pressure drilling in more complex formations. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0089] Figure 1 This 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 This 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 This is a schematic diagram of a drilling wellbore used in a drilling hydraulics model correction method based on measurement while drilling technology of the present invention;

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

[0093] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant 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 of the embodiments in this 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 measurement while drilling technology, which is used to correct the hydraulic prediction model and perform measurement while drilling parameter prediction after correction. The method includes:

[0096] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0097] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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 measurement 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 of 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 illustrate 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] The first embodiment of the present invention is a method for calibrating a drilling hydraulic model based on measurement while drilling technology. The steps are described in detail as follows:

[0103] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0104] The downhole tool string pressure loss and the downhole tool string lower end pressure loss are calculated as follows:

[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 pressure consumption P ft , measure the pressure P in the water eye tiAs the pressure loss at the lower end of the downhole tool string P ft—down ;

[0106] The displacement Q is respectively used to correspond to the downhole tool string 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 pressure loss P at the lower end of the downhole tool string 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. The specific fitting relationship can be referred to Figure 4 Graph of

[0110] The displacement Q measured in real time is input into the downhole tool string pressure loss P ft (Q) and pressure loss P at the lower end of the downhole tool string 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 the hydraulic test of the downhole tool string, and the mud density ρ, displacement Q, and vertical pressure value Ps are recorded. The vertical pressure Ps is regarded as the pressure consumption P of the downhole tool string. ft , PWD water eye measured pressure P ti Considered as the pressure loss P at the lower end of the downhole tool string ft—down . Using the recorded data, the pressure loss formula of the downhole tool string is fitted with the displacement as a variable. For example, 8 1 / 2” wellbore, 6 3 / 4” downhole tool string, the designed displacement is 28-32L / s, then the displacement Q can be divided into 26, 28, 30, 32, 34L / s, and the 5 values ​​are hydraulically tested to obtain Ps(26), Ps(28), Ps(30), Ps(32), Ps(34), and the P is 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 pressure loss P at the lower end of the downhole tool stringft—down (Q)Calculation formula.

[0112] In the present invention, the method for obtaining the hydrostatic column pressure is to smooth the wellbore geometric parameters measured by MWD and update the wellbore 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 and calculate the vertical depth at a certain point x, which is used to calculate the hydrostatic column pressure P g (x), P g (x) = ρgh x .

[0113] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[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 rotational speeds of 600, 300, 200, 100, 6, and 3 r / min, the relationship between the shear stress at different rotational 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 rheological testing, 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 τ(P,T) between the shear stress and the pressure and temperature. 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 iRepresents 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 measurement 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 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 annular drilling fluid density ρ a and / or the drilling fluid density ρ in the drill string water hole 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 parts of drilling fluid containing cuttings returned from the wellbore, measure the volume v and mass m of the n parts of drilling fluid, calculate the density ρ = m / v of the n parts of drilling fluid, and take the arithmetic mean of the density ρ of the n parts of drilling fluid as the annular drilling fluid density ρ a ;

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

[0128]

[0129] Where 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 drill string water hole, it is measured again at a certain time 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 Parameters are used as the rheological model of annular drilling fluid to improve the accuracy of annular flow friction prediction.

[0131] The drilling fluid density ρ in the drill string water hole p The correction method is: measure the inlet drilling fluid density ρ in As the drilling fluid density in the drill string water hole 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 a calibration value, 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] Wherein, α0 is 1, α0, α n Indicates the first and last elements of the known calibration array;

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

[0142] Due to the limitations of the MWD system upload rate and the total amount of transmitted data, there is a period of time between each set of PWD measurement data received 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, at which time the correction parameter is updated again.

[0143] The drill string water hole temperature is corrected as follows:

[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 drill string water hole spatial discrete point temperature T pi , the drill string water hole is discrete n parts along the axial direction, i = 0, 1, 2, ..., n;

[0145] The PWD water hole measures the temperature T ti As the calibration value, divided by the preset predicted water eye temperature T pn , we get β0:

[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] Wherein, β0 is 1, β0, β n Indicates 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 pressure inside the water hole;

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

[0155] P ti -P ft-down =P ta +P′ fa ;

[0156] Then, the annular pressure gradient between the measuring point and the drill bit is:

[0157]

[0158] Among them, L is the length between the PWD measuring point and the drill bit, and PWD measures the water pressure P ti , PWD measures water eye temperature T ti , PWD annulus measurement pressure P ta .

[0159] The annular pressure is corrected as follows:

[0160] Measure 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 a calibration parameter, and divided by the set predicted pressure P an , and get ζ 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] Wherein, ζ0 is 1, ζ0, ζ n Indicates 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 drill string water hole pressure is corrected by:

[0168] Measure the vertical pressure P s , and use it as an input parameter to input 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 tiAs a calibration parameter, and divided by the set predicted temperature P sn , and 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] Wherein, η0 is 1, η0, η n Indicates the first and last elements of the known calibration array;

[0174] The η i and the P si The product of is taken as the drill string water pressure.

[0175] The calibration parameter array η is used as the correction parameter until the next PWD measurement data is updated, at which time the correction parameter is updated again.

[0176] Among them, when the measurement parameters change, the original parameters in each sub-model are corrected; the updated hydraulic prediction model is corrected using the original parameters after parameter correction; otherwise, the original parameters in the hydraulic model and its sub-models are still corrected using the last collected data for prediction calculation.

[0177] 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.

[0178] Although the various steps in the above embodiment are described in the above-mentioned order, those skilled in the art will 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.

[0179] A second embodiment of the present invention provides an annular space temperature prediction method based on a wellbore annular space temperature prediction model, and is based on a drilling hydraulics model correction method based on measurement while drilling technology. The method includes:

[0180] Get the PWD annulus measured temperature as input data;

[0181] Based on the input data, a prediction result corresponding to the annular space temperature is obtained through the calibrated wellbore annular space temperature prediction model;

[0182] The correction method of the wellbore annulus temperature prediction model is as follows:

[0183] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0184] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[0185] 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 preset parameters of the hydraulic model are updated to obtain an updated wellbore annulus temperature prediction model;

[0186] 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.

[0187] A third embodiment of the present invention provides a method for predicting drill string water hole temperature based on a drilling water hole temperature prediction model, and is based on a drilling hydraulics model correction method based on measurement while drilling technology. The method includes:

[0188] Obtain the measured temperature of the inlet drilling fluid as input data;

[0189] Based on the input data, a prediction result corresponding to the drill string water hole temperature is obtained through the calibrated drilling water hole temperature prediction model;

[0190] The calibration method of the drilling water hole temperature prediction model is as follows:

[0191] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0192] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[0193] 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;

[0194] 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

[0195] A fourth embodiment of the present invention provides an annular pressure prediction method based on a wellbore annular pressure prediction model, and is based on a drilling hydraulics model correction method based on measurement while drilling technology. The method includes:

[0196] Get the wellhead back pressure as input data;

[0197] Based on the input data, a prediction result corresponding to the annular pressure is obtained through the calibrated wellbore annular pressure prediction model;

[0198] The correction method of the wellbore annulus pressure prediction model is as follows:

[0199] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0200] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[0201] 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;

[0202] 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.

[0203] A fifth embodiment of the present invention provides a method for predicting drill string water hole pressure based on a drilling water hole pressure prediction model, and is based on a drilling hydraulics model correction method based on measurement while drilling technology. The method includes:

[0204] Get vertical pressure as input data;

[0205] Based on the input data, a prediction result corresponding to the drill string water hole pressure is obtained through the calibrated drilling water hole pressure prediction model;

[0206] The drilling water hole pressure prediction model is calibrated as follows:

[0207] Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure.

[0208] Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters;

[0209] 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;

[0210] 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.

[0211] The terms "first", "second", etc. are used to distinguish similar objects, rather than to describe or indicate a particular order or sequence.

[0212] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0213] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A drilling hydraulic model correction method based on measurement while drilling technology, used to correct the hydraulic prediction model and perform measurement while drilling parameter prediction after correction, characterized in that: The method includes: Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure. Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters; 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 measurement 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; Input data into the corresponding sub-model of 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 drilling hydraulic model correction method based on measurement while drilling technology according to claim 1, characterized in that: The downhole tool string pressure loss and the downhole tool string lower end pressure loss are calculated as follows: 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 pressure consumption P ft , measure the pressure P in the water eye ti As the pressure loss at the lower end of the downhole tool string P ft—down ; The displacement Q is respectively used to correspond to the downhole tool string 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 pressure loss P at the lower end of the downhole tool string 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; The displacement Q measured in real time is input into the downhole tool string pressure loss P ft (Q) and pressure loss P at the lower end of the downhole tool string 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 parts of drilling fluid containing cuttings returned from the wellbore, measure the volume v and mass m of the n parts of drilling fluid, calculate the density ρ = m / v of the n parts of drilling fluid, and take the arithmetic mean of the density ρ of the n parts of drilling fluid as the annular drilling fluid density ρ a ; The drilling fluid density ρ in the drill string water hole p The correction method is: measure the inlet drilling fluid density ρ in As the drilling fluid density in the drill string water hole 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 a calibration value, 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 Indicates the first and last elements of the known calibration array; The α i The temperature T of the discrete points in the annular space ai The product of is taken as the annular temperature; The drill string water hole temperature is corrected as follows: 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 drill string water hole spatial discrete point temperature T pi , the drill string water hole is discrete n parts along the axial direction, i = 0, 1, 2, ..., n; The PWD water hole 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 Indicates 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 pressure is corrected as follows: Measure 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 a calibration parameter, and divided by the set predicted pressure P an , and get ζ 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 Indicates 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 drill string water hole pressure is corrected by: Measure the vertical pressure P s , and use it as an input parameter to input 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 a calibration parameter, and divided by the set predicted temperature P sn , and 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 measurement while drilling technology according to 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 the calibrated wellbore annular space temperature prediction model; The correction method of the wellbore annulus temperature prediction model is as follows: Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure. Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters; 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 preset parameters of the hydraulic model 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 drill string water hole temperature based on a drilling water hole temperature 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: 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 the calibrated drilling water hole temperature prediction model; The calibration method of the drilling water hole temperature prediction model is as follows: Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure. Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters; 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 the calibrated wellbore annular pressure prediction model; The correction method of the wellbore annulus pressure prediction model is as follows: Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure. Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters; 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 measurement while drilling technology according to any one of claims 1 to 6, characterized in that: The method includes: Get vertical pressure as input data; Based on the input data, a prediction result corresponding to the drill string water hole pressure is obtained through the calibrated drilling water hole pressure prediction model; The drilling water hole pressure prediction model is calibrated as follows: Conduct hydraulic testing of the downhole tool string within a preset drilling fluid displacement range, obtain test result parameters, and perform fitting calculations to obtain the downhole tool string pressure loss and the pressure loss at the lower end of the downhole tool string. Interpolate the deflection well data and azimuth data to obtain vertical depth data and calculate the hydrostatic column pressure. Smoothing the MWD measured wellbore geometry parameters to obtain updated data for wellbore geometry calculation; performing rheological tests on the drilling fluid at set temperature and set pressure to obtain a two-dimensional rheological parameter prediction model with temperature and pressure as variables, and obtaining the two-dimensional rheological parameters; 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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