Method, device, equipment and readable storage medium for determining drilling circulation pressure loss

Abstract

The present invention discloses a method, device, equipment and readable storage medium for determining drilling circulation pressure loss, which belongs to the technical field of oil drilling and production engineering, including obtaining drilling fluid density, plastic viscosity, drill tool length, drill tool inner diameter, drill tool outer diameter, wellbore diameter, first measured vertical pressure value, second measured vertical pressure value; calculating uncorrected drill tool inner circulation pressure loss calculation value, uncorrected drill tool outer annulus circulation pressure loss calculation value, and drill bit nozzle pressure drop; introducing drill tool inner circulation pressure loss correction coefficient α and drill tool outer annulus circulation pressure loss correction coefficient β; using the first measured vertical pressure as the corrected first vertical pressure calculation value and the second measured vertical pressure as the corrected second vertical pressure calculation value, obtaining a set of two-variable linear equations containing two unknowns α and β, and calculating the specific values ​​of α and β; bringing the calculated specific values ​​of α and β back to the correction calculation formula respectively; and calculating the corrected circulation pressure loss calculation value. The present invention can improve the determination accuracy of drilling circulation pressure loss.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling and production engineering, and in particular to a method, device, equipment and readable storage medium for determining drilling circulation pressure loss. Background Art

[0002] Circulating pressure loss is an important parameter in the drilling process. Accurately determining the value of circulating pressure loss has very important engineering significance. It can not only determine whether the operating conditions of the ground mud pump, the drill bit in the well and the downhole power drilling tool are normal at any time, but is also one of the important links in hydraulic parameter design. It is also the main basis for judging complex situations such as drill string leakage and formation leakage pressure.

[0003] However, the various existing cycle pressure loss calculation methods have many difficulties, such as poor calculation accuracy, cumbersome calculation methods, huge calculation amount, and even the need for computer-specific software, and high costs. For example, in the face of various influencing factors and different influencing results, some scholars have proposed that an "equivalent coefficient" or "comprehensive coefficient" can be determined through on-site measurement information to obtain analysis results consistent with engineering measurement values. Based on a lot of predecessors' work, under the premise of fully considering various influencing factors, the simplest formula that contains the most basic influencing factors, especially fluid mechanics (i.e., the traditional cycle pressure loss calculation method), is adopted, and a correction coefficient is introduced to greatly simplify the calculation process while obtaining calculation results that meet engineering needs. The basic principle is: Long Zhihui (Kuai Min. Research and application of accurate calculation method for circulating pressure loss in small wells [J]. Petroleum Mine Machinery, 2017, 46 (1): 71-75. Long Zhihui, Zhang Xiangqian, Wang Qian. "Reverse analysis" method for calculating pressure loss of drilling circulation system [J]. Journal of Chongqing University of Science and Technology: Natural Science Edition, 2006, 8 (3): 1-3) et al. believe that first, without connecting the drilling tools and drill bits, the correction coefficient K of the surface circulating pressure loss is measured. g Then, lower the bare drill pipe and record the vertical pressure with a certain drilling fluid displacement cycle, then connect the required number of centralizers, use the same drilling fluid displacement cycle at the same depth, measure the actual single drill centralizer influence value, and get the centralizer correction coefficient K f Finally, according to the actual circulation pressure of the drilling tool assembly during drilling and the theoretical calculation pressure, combined with the correction factor f m , and obtain the total correction coefficient K of the internal and external circulation pressure loss of the drilling tool L .

[0004] The “anti-analysis” method has the following flaws:

[0005] ① A total of three correction factors are introduced, among which the surface manifold circulation pressure loss coefficient is not a must-measure item, because no matter when the circulation occurs, the actual surface manifold circulation pressure loss can be directly obtained through the difference between the pump pressure and the vertical pressure.

[0006] ② It is necessary to run different drill bit combinations for actual measurement to obtain the effect of the centralizer on the pressure loss. This not only has a certain impact on the construction time, but the centralizer is only a part of the factors affecting the annular pressure loss, and is not the only reason for the error in the calculation of the annular pressure loss.

[0007] ③ In conventional drilling, most of the circulating pressure loss occurs in the drill string and the water hole of the drill bit. The reasons and influence degrees of inaccurate pressure loss calculation in the drill tool and the annulus are different. Therefore, using the same correction coefficient for the pressure loss in the drill tool and the annulus will inevitably lead to errors in the calculation results. Summary of the invention

[0008] In order to solve the above problems in the prior art, the present invention provides a method, device, equipment and readable storage medium for determining drilling circulation pressure consumption, which can improve the determination accuracy of drilling circulation pressure consumption.

[0009] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions.

[0010] A method for determining drilling circulation pressure loss comprises the following steps:

[0011] Step 1: Obtain the drilling fluid density ρ d , plastic viscosity μ Pv , Drill length L P , Drilling tool inner diameter d Pi , Drilling tool outer diameter d P , borehole diameter d h ; Obtain a first measured vertical pressure value P1 when the drilling tool assembly drills to a first depth under the condition of a first drilling fluid displacement rate Q1, and a second measured vertical pressure value P2 when the drilling tool assembly drills to a second depth under the condition of a second drilling fluid displacement rate Q2;

[0012] Step 2: Calculate the uncorrected drilling tool internal circulation pressure loss value ΔP using equations (1), (2), (3), and (4): Pi and the uncorrected calculated pressure loss of the drilling tool outer annulus circulation ΔP Pa ; The drill nozzle pressure drop ΔP is calculated by formula (5): b ;

[0013] (1)

[0014] In formula (1), k Pi is the uncorrected drilling tool internal circulation pressure loss coefficient, a dimensionless quantity; L P is the drilling tool length, m; Q is the drilling fluid displacement, L / s;

[0015] (3)

[0016] In formula (3), k Pa is the uncorrected drilling tool external circulation pressure loss coefficient, a dimensionless quantity;

[0017] (2)

[0018] In formula (2), ρ d is the drilling fluid density, g / cm 3 ;μ Pv is the plastic viscosity, MPa·s; d Pi is the inner diameter of the drill bit, mm;

[0019] (4)

[0020] In formula (4), d P is the outer diameter of the drill bit, mm; d h is the borehole diameter, mm;

[0021] (5)

[0022] In formula (5), A j is the drill nozzle cross-sectional area, mm 2 ;

[0023] Step 3, introduce the drill tool internal circulation pressure loss correction coefficient α and the drill tool external annulus circulation pressure loss correction coefficient β into equations (1) and (3), and obtain equations (6) and (7);

[0024] (6)

[0025] In formula (6), ΔP Pi ' is the corrected pressure loss of the drill internal circulation, MPa; α is the correction coefficient of the pressure loss of the drill internal circulation, dimensionless quantity;

[0026] (7)

[0027] In formula (7), ΔP Pa ' is the corrected drilling tool outer annulus circulation pressure loss, MPa; β is the drilling tool outer annulus circulation pressure loss correction coefficient, dimensionless quantity;

[0028] Step 4, using the first measured vertical pressure P1 as the corrected first vertical pressure calculation value, and the second measured vertical pressure P2 as the corrected second vertical pressure calculation value, to obtain a set of two-variable linear equations containing two unknowns α and β, and to calculate the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β;

[0029]

[0030] In the above system of linear equations of two variables:

[0031] ΔP Pi1 ' is the calculated value of the corrected internal circulation pressure loss of the first drilling tool when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP Pa1 ' is the calculated value of the first drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP b1 is the pressure drop of the first drill nozzle calculated by substituting Q1 into equation (5); ΔP Pi1 is the uncorrected calculated value of the first drilling tool internal circulation pressure loss obtained by substituting Q1 into formula (1); ΔP Pa1 is the uncorrected calculated value of the first drilling tool outer annulus circulation pressure loss obtained by substituting Q1 into formula (3);

[0032] ΔP Pi2 ' is the calculated value of the second drilling tool internal circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP Pa2 ' is the calculated value of the second drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP b2 is the pressure drop of the second drill nozzle calculated by substituting Q2 into equation (5); ΔP Pi2 is the uncorrected calculated value of the internal circulation pressure loss of the second drilling tool obtained by substituting Q2 into formula (1); ΔP Pa2 is the uncorrected calculated value of the second drilling tool outer annulus circulation pressure loss obtained by substituting Q2 into formula (3);

[0033] Step 5, the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β calculated in step 4 are respectively brought back into equation (6) and equation (7) to obtain the corrected equations (6) and (7);

[0034] Step 6, according to formula (5), the corrected formula (6) and the corrected formula (7), formula (8) is obtained, and then based on formula (8), the corrected circulating pressure loss calculation value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3 is determined;

[0035] (8)

[0036] In formula (8), P is the corrected cycle pressure loss calculated value, MPa; α0 and β0 in formula (8) are both known values. Substituting Q3 into formula (1) to calculate ΔP in formula (8) Pi , substituting Q3 into equation (3) to calculate ΔP in equation (8) Pa , substituting Q3 into equation (5) to calculate ΔP in equation (8) b.

[0037] In step 2, when there are multiple specifications of drilling tools at the same time, the final ΔP is obtained by adding up the calculated segments. Pi and ΔP Pa Calculated value.

[0038] A device for determining drilling circulation pressure loss, comprising:

[0039] Data acquisition module, which is used to obtain the drilling fluid density ρ d , plastic viscosity μ Pv , Drill length L P , Drilling tool inner diameter d Pi , Drilling tool outer diameter d P , borehole diameter d h ; Obtain a first measured vertical pressure value P1 when the drilling tool assembly drills to a first depth under the condition of a first drilling fluid displacement rate Q1, and a second measured vertical pressure value P2 when the drilling tool assembly drills to a second depth under the condition of a second drilling fluid displacement rate Q2;

[0040] The circulation pressure loss calculation value and drill nozzle pressure drop calculation module is used to calculate the uncorrected drilling tool internal circulation pressure loss calculation value ΔP through equations (1), (2), (3) and (4): Pi and the uncorrected calculated pressure loss of the drilling tool outer annulus circulation ΔP Pa ; The drill nozzle pressure drop ΔP is calculated by formula (5): b ;

[0041] (1)

[0042] In formula (1), k Pi is the uncorrected drilling tool internal circulation pressure loss coefficient, a dimensionless quantity; L P is the drilling tool length, m; Q is the drilling fluid displacement, L / s;

[0043] (3)

[0044] In formula (3), k Pa is the uncorrected drilling tool outer annulus circulation pressure loss coefficient, a dimensionless quantity;

[0045] (2)

[0046] In formula (2), ρ d is the drilling fluid density, g / cm 3 ;μ Pv is the plastic viscosity, MPa·s; d Pi is the inner diameter of the drill bit, mm;

[0047] (4)

[0048] In formula (4), d P is the outer diameter of the drill bit, mm; d h is the borehole diameter, mm;

[0049] (5)

[0050] In formula (5), A j is the drill nozzle cross-sectional area, mm 2 ;

[0051] The correction coefficient introduction module is used to introduce the drill tool internal circulation pressure loss correction coefficient α and the drill tool external annulus circulation pressure loss correction coefficient β into equations (1) and (3), and obtain equations (6) and (7);

[0052] (6)

[0053] In formula (6), ΔP Pi ' is the corrected pressure loss of the drill internal circulation, MPa; α is the correction coefficient of the pressure loss of the drill internal circulation, dimensionless quantity;

[0054] (7)

[0055] In formula (7), ΔP Pa ' is the corrected drilling tool outer annulus circulation pressure loss, MPa; β is the drilling tool outer annulus circulation pressure loss correction coefficient, dimensionless quantity;

[0056] A correction coefficient calculation module is used to use the first measured vertical pressure P1 as a corrected first vertical pressure calculation value and the second measured vertical pressure P2 as a corrected second vertical pressure calculation value, obtain a binary linear equation group containing two unknowns α and β, and calculate the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β;

[0057]

[0058] In the above system of linear equations of two variables:

[0059] ΔP Pi1 ' is the calculated value of the corrected internal circulation pressure loss of the first drilling tool when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP Pa1 ' is the calculated value of the first drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP b1 is the pressure drop of the first drill nozzle calculated by substituting Q1 into equation (5); ΔP Pi1 is the uncorrected calculated value of the first drilling tool internal circulation pressure loss obtained by substituting Q1 into formula (1); ΔPPa1 is the uncorrected calculated value of the first drilling tool outer annulus circulation pressure loss obtained by substituting Q1 into formula (3);

[0060] ΔP Pi2 ' is the calculated value of the second drilling tool internal circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP Pa2 ' is the calculated value of the second drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP b2 is the pressure drop of the second drill nozzle calculated by substituting Q2 into equation (5); ΔP Pi2 is the uncorrected calculated value of the internal circulation pressure loss of the second drilling tool obtained by substituting Q2 into formula (1); ΔP Pa2 is the uncorrected calculated value of the second drilling tool outer annulus circulation pressure loss obtained by substituting Q2 into formula (3);

[0061] A correction formula generation module is used to bring the calculated specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β back to formula (6) and formula (7) respectively to obtain the corrected formula (6) and formula (7);

[0062] A circulation pressure loss determination module, which is used to obtain equation (8) according to equation (5), the modified equation (6) and the modified equation (7), and then determine the modified circulation pressure loss calculation value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3 based on equation (8);

[0063] (8)

[0064] In formula (8), P is the corrected cycle pressure loss calculated value, MPa; α0 and β0 in formula (8) are both known values. Substituting Q3 into formula (1) to calculate ΔP in formula (8) Pi , substituting Q3 into equation (3) to calculate ΔP in equation (8) Pa , substituting Q3 into equation (5) to calculate ΔP in equation (8) b .

[0065] In the cycle pressure loss calculation value and drill nozzle pressure drop calculation module, when there are multiple specifications of drilling tools at the same time, the final ΔP is obtained by adding them after segmented calculation. Pi and ΔP Pa Calculated value.

[0066] A drilling circulation pressure loss determination device includes: a processor coupled to a memory;

[0067] The memory is used to store computer programs;

[0068] The processor is used to execute the computer program stored in the memory, so that the drilling circulation pressure loss determination device executes the drilling circulation pressure loss determination method.

[0069] A readable storage medium includes a program or an instruction. When the program or the instruction is run on a computer, the method for determining the drilling circulation pressure loss is executed.

[0070] The present invention has the following beneficial technical effects:

[0071] Because the largest possible drilling fluid displacement is used in actual on-site drilling, it is believed that the flow state of the drilling fluid is consistent and turbulent; the present invention no longer needs to lower different drill tool combinations (different numbers of stabilizers) to measure the influence of the stabilizers, which can reduce the workload and save drilling time. At the same time, the influence of the internal and external circulation pressure consumption of the drill tool is considered separately, and the drilling circulation pressure consumption can be determined more accurately. The present invention simplifies the number of correction coefficients to 2 in order to simplify the calculation method as much as possible, reduce the workload of on-site operations, save operation time, and more accurately determine the drilling circulation pressure consumption, thereby meeting the needs of on-site drilling construction. After actual on-site verification, this method has achieved good application results. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a structural schematic diagram of a device for determining drilling circulation pressure loss of the present invention;

[0073] Figure 2 It is a structural schematic diagram of a device for determining drilling circulation pressure loss of the present invention;

[0074] Figure 3 This is a comparison chart of the calculation results of circulating pressure consumption at different depths in a well involved in Application Example 1. DETAILED DESCRIPTION

[0075] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0076] The present invention provides a method for determining drilling circulation pressure loss, comprising steps 1 to 6.

[0077] Step 1: Obtain the drilling fluid density ρ d , plastic viscosity μ Pv , Drill length L P , Drilling tool inner diameter d Pi , Drilling tool outer diameter d P , borehole diameter d h; Obtain the first measured vertical pressure value P1 when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1, and the second measured vertical pressure value P2 when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2. Among them, Q1, P1, Q2, and P2 can be historical data or data measured during two actual drilling operations. ρ d , μ Pv , L P ,d Pi ,d P ,d h All are known data.

[0078] Step 2: Calculate the uncorrected drilling tool internal circulation pressure loss value ΔP using equations (1), (2), (3), and (4): Pi and the uncorrected calculated pressure loss of the drilling tool outer annulus circulation ΔP Pa ; The drill nozzle pressure drop ΔP is calculated by formula (5): b ;

[0079] (1)

[0080] In formula (1), k Pi is the uncorrected drilling tool internal circulation pressure loss coefficient, a dimensionless quantity; L P is the drilling tool length, m; Q is the drilling fluid displacement, L / s;

[0081] (3)

[0082] In formula (3), k Pa is the uncorrected drilling tool outer annulus circulation pressure loss coefficient, a dimensionless quantity;

[0083] (2)

[0084] In formula (2), ρ d is the drilling fluid density, g / cm 3 ;μ Pv is the plastic viscosity, MPa·s; d Pi is the inner diameter of the drill bit, mm;

[0085] (4)

[0086] In formula (4), d P is the outer diameter of the drill bit, mm; d h is the borehole diameter, mm;

[0087] (5)

[0088] In formula (5), A j is the drill nozzle cross-sectional area, mm2 .

[0089] Step 3, introduce the drill tool internal circulation pressure loss correction coefficient α and the drill tool external annulus circulation pressure loss correction coefficient β into equations (1) and (3), and obtain equations (6) and (7);

[0090] (6)

[0091] In formula (6), ΔP Pi ' is the corrected pressure loss of the drill internal circulation, MPa; α is the correction coefficient of the pressure loss of the drill internal circulation, dimensionless quantity;

[0092] (7)

[0093] In formula (7), ΔP Pa ' is the corrected drilling tool outer annulus circulation pressure loss, MPa; β is the drilling tool outer annulus circulation pressure loss correction coefficient, dimensionless quantity.

[0094] Step 4, using the first measured vertical pressure P1 as the corrected first vertical pressure calculation value, and the second measured vertical pressure P2 as the corrected second vertical pressure calculation value, to obtain a set of two-variable linear equations containing two unknowns α and β, and to calculate the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β;

[0095]

[0096] In the above system of linear equations of two variables:

[0097] ΔP Pi1 ' is the calculated value of the corrected internal circulation pressure loss of the first drilling tool when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP Pa1 ' is the calculated value of the first drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP b1 is the pressure drop of the first drill nozzle calculated by substituting Q1 into equation (5); ΔP Pi1 is the uncorrected calculated value of the first drilling tool internal circulation pressure loss obtained by substituting Q1 into formula (1); ΔP Pa1 is the uncorrected calculated value of the first drilling tool outer annulus circulation pressure loss obtained by substituting Q1 into formula (3);

[0098] ΔP Pi2 ' is the calculated value of the second drilling tool internal circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP Pa2 ' is the calculated value of the second drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔPb2 is the pressure drop of the second drill nozzle calculated by substituting Q2 into equation (5); ΔP Pi2 is the uncorrected calculated value of the internal circulation pressure loss of the second drilling tool obtained by substituting Q2 into formula (1); ΔP Pa2 is the uncorrected calculated value of the second drilling tool outer annulus circulation pressure loss obtained by substituting Q2 into formula (3).

[0099] Step 5: Substitute the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β calculated in step 4 back into equation (6) and equation (7) to obtain the corrected equations (6) and (7).

[0100] Step 6, according to formula (5), the corrected formula (6) and the corrected formula (7), formula (8) is obtained, and then based on formula (8), the corrected circulating pressure loss calculation value is determined when the drilling tool assembly drills to other depths, such as the third depth, under other drilling fluid displacement conditions Q3;

[0101] (8)

[0102] In formula (8), P is the corrected circulating pressure loss calculated value, MPa. The corrected circulating pressure loss calculated value is the corrected theoretical calculated vertical pressure value. When determining the corrected circulating pressure loss calculated value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3, α0 and β0 in formula (8) are both known values. Substituting Q3 into formula (1) to calculate ΔP in formula (8) Pi , substituting Q3 into equation (3) to calculate ΔP in equation (8) Pa , substituting Q3 into equation (5) to calculate ΔP in equation (8) b , and then determine P through formula (8), that is, the corrected cycle pressure loss calculated value or the corrected theoretical calculated standing pressure value.

[0103] In step 2, when there are multiple specifications of drilling tools at the same time, the final ΔP is obtained by adding up the calculated segments. Pi and ΔP Pa Calculated value.

[0104] like Figure 1 As shown, the present invention provides a device 10 for determining drilling circulation pressure loss, including a data acquisition module 11, a circulation pressure loss calculation value and drill nozzle pressure drop calculation module 12, a correction coefficient introduction module 13, a correction coefficient calculation module 14, a correction formula generation module 15, and a circulation pressure loss determination module 16.

[0105] The data acquisition module 11 is used to obtain the drilling fluid density ρ d , plastic viscosity μ Pv , Drill length L P, Drilling tool inner diameter d Pi , Drilling tool outer diameter d P , borehole diameter d h ; Obtain a first measured vertical pressure value P1 when the drilling tool assembly drills to a first depth under the condition of a first drilling fluid displacement rate Q1 and a second measured vertical pressure value P2 when the drilling tool assembly drills to a second depth under the condition of a second drilling fluid displacement rate Q2.

[0106] The circulation pressure loss calculation value and drill nozzle pressure drop calculation module 12 is used to calculate the uncorrected drilling tool internal circulation pressure loss calculation value ΔP through equations (1), (2), (3) and (4): Pi and the uncorrected calculated pressure loss of the drilling tool outer annulus circulation ΔP Pa ; The drill nozzle pressure drop ΔP is calculated by formula (5): b ;

[0107] (1)

[0108] In formula (1), k Pi is the uncorrected drilling tool internal circulation pressure loss coefficient, a dimensionless quantity; L P is the drilling tool length, m; Q is the drilling fluid displacement, L / s;

[0109] (3)

[0110] In formula (3), k Pa is the uncorrected drilling tool outer annulus circulation pressure loss coefficient, a dimensionless quantity;

[0111] (2)

[0112] In formula (2), ρ d is the drilling fluid density, g / cm 3 ;μ Pv is the plastic viscosity, MPa·s; d Pi is the inner diameter of the drill bit, mm;

[0113] (4)

[0114] In formula (4), d P is the outer diameter of the drill bit, mm; d h is the borehole diameter, mm;

[0115] (5)

[0116] In formula (5), A j is the drill nozzle cross-sectional area, mm 2 .

[0117] The correction coefficient introduction module 13 is used to introduce the drill tool internal circulation pressure loss correction coefficient α and the drill tool external annulus circulation pressure loss correction coefficient β into equations (1) and (3), and obtain equations (6) and (7);

[0118] (6)

[0119] In formula (6), ΔP Pi ' is the corrected pressure loss of the drill internal circulation, MPa; α is the correction coefficient of the pressure loss of the drill internal circulation, dimensionless quantity;

[0120] (7)

[0121] In formula (7), ΔP Pa ' is the corrected drilling tool outer annulus circulation pressure loss, MPa; β is the drilling tool outer annulus circulation pressure loss correction coefficient, dimensionless quantity.

[0122] The correction coefficient calculation module 14 is used to use the first measured vertical pressure P1 as the corrected first vertical pressure calculation value, and the second measured vertical pressure P2 as the corrected second vertical pressure calculation value, to obtain a set of two-variable linear equations containing two unknowns α and β, and to calculate the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β;

[0123]

[0124] In the above system of linear equations of two variables:

[0125] ΔP Pi1 ' is the calculated value of the corrected internal circulation pressure loss of the first drilling tool when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP Pa1 ' is the calculated value of the first drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP b1 is the pressure drop of the first drill nozzle calculated by substituting Q1 into equation (5); ΔP Pi1 is the uncorrected calculated value of the first drilling tool internal circulation pressure loss obtained by substituting Q1 into formula (1); ΔP Pa1 is the uncorrected calculated value of the first drilling tool outer annulus circulation pressure loss obtained by substituting Q1 into formula (3);

[0126] ΔP Pi2 ' is the calculated value of the second drilling tool internal circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP Pa2 ' is the calculated value of the second drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP b2is the pressure drop of the second drill nozzle calculated by substituting Q2 into equation (5); ΔP Pi2 is the uncorrected calculated value of the internal circulation pressure loss of the second drilling tool obtained by substituting Q2 into formula (1); ΔP Pa2 is the uncorrected calculated value of the second drilling tool outer annulus circulation pressure loss obtained by substituting Q2 into formula (3).

[0127] The correction formula generation module 15 is used to bring the calculated specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β back to equation (6) and equation (7) respectively to obtain the corrected equation (6) and the corrected equation (7).

[0128] The circulation pressure loss determination module 16 is used to obtain the formula (8) according to the formula (5), the modified formula (6) and the modified formula (7), and then determine the modified circulation pressure loss calculation value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3 based on the formula (8);

[0129] (8)

[0130] In formula (8), P is the corrected circulating pressure loss calculated value, MPa. The corrected circulating pressure loss calculated value is the corrected theoretical calculated vertical pressure value. When determining the corrected circulating pressure loss calculated value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3, α0 and β0 in formula (8) are both known values. Substituting Q3 into formula (1) to calculate ΔP in formula (8) Pi , substituting Q3 into equation (3) to calculate ΔP in equation (8) Pa , substituting Q3 into equation (5) to calculate ΔP in equation (8) b , and thus P is determined by formula (8), that is, the corrected cycle pressure loss calculated value or the corrected theoretical calculated standing pressure value.

[0131] In the cycle pressure loss calculation value and drill nozzle pressure drop calculation module 12, when there are multiple specifications of drilling tools at the same time, the final ΔP is obtained by adding up the calculated values ​​in sections. Pi and ΔP Pa Calculated value.

[0132] Figure 2 This is a schematic diagram of the structure of the device for determining the drilling circulation pressure loss provided in the embodiment of the present application. Figure 2The drilling cycle pressure loss determination device 20 may include a transceiver 21, a memory 22, and a processor 23. The transceiver 21 may include a transmitter and / or a receiver. The transmitter may also be referred to as a transmitter, a transmitter, a transmission port, a transmission interface, or the like, and the receiver may also be referred to as a receiver, a receiver, a reception port, a reception interface, or the like. Exemplarily, the transceiver 21, the memory 22, and the processor 23 are interconnected via a bus 24.

[0133] The memory 22 is used to store computer programs; the processor 23 is used to execute the computer programs stored in the memory, so that the drilling circulation pressure loss determination device 20 executes the drilling circulation pressure loss determination method.

[0134] The receiver of the transceiver 21 can be used to perform the receiving function of the drilling parameter determination device in the above-mentioned method for determining the drilling circulation pressure loss.

[0135] An embodiment of the present application provides a readable storage medium, including a program or an instruction. When the program or the instruction is run on a computer, the method for determining the drilling cycle pressure loss is executed.

[0136] To further illustrate the technical effects of the present invention, an on-site application example of the present invention is described below.

[0137] Application Example 1

[0138] For example, the drilling depth of a well is 5306m after the first three drillings, the drill bit size is 215.9mm, the average hole diameter of the measured open hole section is 230mm, and the drilling fluid density is 2.12g / cm 3 , plastic viscosity 38mPa·s; the inner diameter of the secondary casing is 219.5mm, the casing depth is 3049m, and the inclination point is 4285m.

[0139] Well drilling assembly: Ф215.9mm roller drill bit + double nut + check valve + 1 Φ165mm drill collar + Φ212mm centralizer + 1 Φ165mm drill collar + Φ210mm centralizer + 1 Φ165mm drill collar + Φ206mm centralizer + 3 Φ165mm drill collars + 10 Φ127mm drill pipes + 1 Φ127mm weighted drill pipe + while drilling jar + bypass valve + 20 Φ127mm weighted drill pipes (5 sand cleaning drill pipes evenly distributed) + 25 Φ127mm drill pipes + Φ139.7mm drill pipe.

[0140] The drill bit water hole combination is Φ33mm×3, the inner diameter of the Φ165mm drill collar is 72mm, the inner diameter of the Φ127mm weighted drill pipe is 76.2mm, and the water hole of the Φ139.7mm drill pipe is 118.6mm.

[0141] The structure of the drilling tool assembly is complex, and it is difficult to calculate using the traditional method. If the check valve, drilling jar, etc. are ignored, the calculation accuracy of the internal circulation pressure loss of the drilling tool will inevitably be affected; if the influence of the centralizer, sand cleaning drill rod, etc. is ignored, the calculation accuracy of the annular circulation pressure loss will inevitably be affected. If all are included in the calculation, the calculation amount will be greatly increased.

[0142] Therefore, when drilling down to 1954m, a drilling fluid displacement of 14.52L / s was used for circulation, and a vertical pressure of 4.8MPa was recorded; the drilling continued to 2903m, and a drilling fluid displacement of 28.38L / s was used for circulation, and a vertical pressure of 19.0MPa was recorded. The correction coefficients of the pressure loss in the drill tool and the annular circulation pressure loss were calculated by combining the pressure loss values ​​of each cycle calculated in the two cycles, and were 1.54 and 0.84 respectively. Then the drilling continued, and the circulation was carried out at the depths of 3824m, 4743m, 5212m, and 5233m, and when the drilling was pulled up to 928m, and the theoretically determined vertical pressure after correction and the actual vertical pressure were compared, and the data were shown in Table 1.

[0143] Table 1 Calculation results of circulating pressure loss at different depths in a well

[0144]

[0145] From the data comparison in Table 1, it can be seen that in the case of complex drilling tool assembly, the vertical pressure value obtained by the traditional calculation method deviates from the actual value by about 30%, which is difficult to meet the engineering needs. However, the result of the drilling circulation pressure consumption determined by the method of the present invention has a very high degree of consistency with the actual value, and the error value is within 3.50%, see Figure 3 .

[0146] Application Example 2

[0147] For example, after drilling the second well (vertical section), the mud density was 1.63 g / cm 3 The dynamic pressure bearing test of the Sanfutong drilling tool assembly was carried out at the bottom of the well, and the vertical pressure values ​​were measured under different well depths and different drilling fluid displacement conditions. Then, the correction coefficients of the internal and external circulation pressure loss of the drilling tool were calculated to be 1.60 and 0.80 respectively.

[0148] In the case of dynamic pressure bearing without leakage, in order to further explore the pressure bearing capacity of the formation and prepare for cementing, the dynamic pressure bearing test was continued by controlling the throttle valve after closing the well for closed-loop circulation. When the drilling fluid displacement was 19.2L / s, leakage occurred. At this time, the casing pressure was 2.40MPa, and the circulating pressure loss of the entire well section was calculated to be 3.18MPa. The vertical pressure value determined by the method of the present invention was 5.58MPa, and the actual vertical pressure was 5.40MPa, with an error of 3.33%. Because the leakage point is at 1932m, theoretically, the drilling fluid displacement in the shallow well section above 1932m will be reduced, and the vertical pressure value determined by the method of the present invention will be larger than the actual value, which is consistent with the actual results.

[0149] At the same time, when leakage occurs, in addition to the static liquid column pressure, the well depth of 1932m also bears the casing pressure and the annular pressure loss of the well section above this point, which is the sum of the two, that is, 2.40MPa+0.33MPa=2.73MPa, and the equivalent density at this point is converted to 1.77g / cm 3 When the well was drilled to 1932m, leakage occurred during the formation pressure bearing capacity test (static). When the well was drilled to 2427m, static pressure bearing was tested again. When leakage occurred, the equivalent density at the depth of 1932m was 1.75g / cm 3 The equivalent density of the leak point obtained by static pressure bearing and dynamic pressure bearing is basically the same, which is consistent with the actual situation, with a difference of only 0.02g / cm 3 This shows that the results of the circulation pressure loss in the annular space are relatively accurate.

[0150] It can be seen that the present invention introduces two correction coefficients (double correction coefficients) to correct the internal circulation pressure loss and the external circulation pressure loss of the drilling tool, respectively, which can effectively correct the calculated values ​​of the two and improve the determination accuracy of the drilling circulation pressure loss.

[0151] The pressure loss of the drilling circulation system is the comprehensive result of the influence of multiple factors. It is difficult to accurately measure or calculate the influence of a single factor. With the advancement of drilling technology and the complexity of downhole tools, the results obtained by the traditional method of determining the pressure loss of drilling circulation often have a large deviation from the measured values, which is difficult to meet engineering needs.

[0152] The present invention introduces two correction coefficients to respectively correct the internal and external circulation pressure losses of the drilling tool, so that the result of the drilling circulation pressure loss can be closer to the actual value and obtain higher accuracy. It has been confirmed by field practice that the method is simple and effective.

[0153] The present invention is applicable to vertical wells, inclined wells and other well types, especially when the drilling tool combination is relatively complex, and the determined circulation pressure loss result is highly consistent with the actual value.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining drilling circulation pressure loss, characterized in that: The steps include: Step 1: Obtain the drilling fluid density ρ d , plastic viscosity μ Pv , Drill length L P , Drilling tool inner diameter d Pi , Drilling tool outer diameter d P , borehole diameter d h ; Obtain a first measured vertical pressure value P1 when the drilling tool assembly drills to a first depth under the condition of a first drilling fluid displacement rate Q1, and a second measured vertical pressure value P2 when the drilling tool assembly drills to a second depth under the condition of a second drilling fluid displacement rate Q2; Step 2: Calculate the uncorrected drilling tool internal circulation pressure loss value ΔP using equations (1), (2), (3), and (4): Pi and the uncorrected calculated pressure loss of the drilling tool outer annulus circulation ΔP Pa ; The drill nozzle pressure drop ΔP is calculated by formula (5): b ; （1） In formula (1), k Pi is the uncorrected drilling tool internal circulation pressure loss coefficient, a dimensionless quantity; L P is the drilling tool length, m; Q is the drilling fluid displacement, L / s; （3） In formula (3), k Pa is the uncorrected drilling tool outer annulus circulation pressure loss coefficient, a dimensionless quantity; （2） In formula (2), ρ d is the drilling fluid density, g / cm 3 ;μ Pv is the plastic viscosity, MPa·s; d Pi is the inner diameter of the drill bit, mm; （4） In formula (4), d P is the outer diameter of the drill bit, mm; d h is the borehole diameter, mm; （5） In formula (5), A j is the drill nozzle cross-sectional area, mm 2 ; Step 3, introduce the drill tool internal circulation pressure loss correction coefficient α and the drill tool external annulus circulation pressure loss correction coefficient β into equations (1) and (3), and obtain equations (6) and (7); （6） In formula (6), ΔP Pi ' is the corrected pressure loss of the drill internal circulation, MPa; α is the correction coefficient of the pressure loss of the drill internal circulation, dimensionless quantity; （7） In formula (7), ΔP Pa ' is the corrected drilling tool outer annulus circulation pressure loss, MPa; β is the correction coefficient of the circulating pressure loss of the outer annulus of the drilling tool, which is a dimensionless quantity; Step 4, using the first measured vertical pressure P1 as the corrected first vertical pressure calculation value, and the second measured vertical pressure P2 as the corrected second vertical pressure calculation value, to obtain a set of two-variable linear equations containing two unknowns α and β, and to calculate the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β; ; In the above system of linear equations of two variables: ΔP Pi1 ' is the calculated value of the corrected internal circulation pressure loss of the first drilling tool when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP Pa1 ' is the calculated value of the first drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP b1 is the pressure drop of the first drill nozzle calculated by substituting Q1 into equation (5); ΔP Pi1 is the uncorrected calculated value of the first drilling tool internal circulation pressure loss obtained by substituting Q1 into formula (1); ΔP Pa1 is the uncorrected calculated value of the first drilling tool outer annulus circulation pressure loss obtained by substituting Q1 into formula (3); ΔP Pi2 ' is the calculated value of the second drilling tool internal circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP Pa2 ' is the calculated value of the second drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP b2 is the pressure drop of the second drill nozzle calculated by substituting Q2 into equation (5); ΔP Pi2 is the uncorrected calculated value of the internal circulation pressure loss of the second drilling tool obtained by substituting Q2 into formula (1); ΔP Pa2 is the uncorrected calculated value of the second drilling tool outer annulus circulation pressure loss obtained by substituting Q2 into formula (3); Step 5, the specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β calculated in step 4 are respectively brought back into equation (6) and equation (7) to obtain the corrected equations (6) and (7); Step 6, according to formula (5), the corrected formula (6) and the corrected formula (7), formula (8) is obtained, and then based on formula (8), the corrected circulating pressure loss calculation value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3 is determined; （8） In formula (8), P is the corrected cycle pressure loss calculated value, MPa; α0 and β0 in formula (8) are both known values. Substituting Q3 into formula (1) to calculate ΔP in formula (8) Pi , substituting Q3 into equation (3) to calculate ΔP in equation (8) Pa , substituting Q3 into equation (5) to calculate ΔP in equation (8) b .

2. The method for determining drilling circulation pressure loss according to claim 1, characterized in that: In step 2, when there are multiple specifications of drilling tools at the same time, the final ΔP is obtained by adding up the calculated segments. Pi and ΔP Pa Calculated value.

3. A device for determining drilling circulation pressure loss, characterized in that: include: The data acquisition module (11) is used to obtain the drilling fluid density ρ d , plastic viscosity μ Pv , Drill length L P , Drilling tool inner diameter d Pi , Drilling tool outer diameter d P , borehole diameter d h ; Obtain a first measured vertical pressure value P1 when the drilling tool assembly drills to a first depth under the condition of a first drilling fluid displacement rate Q1, and a second measured vertical pressure value P2 when the drilling tool assembly drills to a second depth under the condition of a second drilling fluid displacement rate Q2; A circulation pressure loss calculation value and drill nozzle pressure drop calculation module (12) is used to calculate the uncorrected drilling tool internal circulation pressure loss calculation value ΔP through equations (1), (2), (3) and (4). Pi and the uncorrected calculated pressure loss of the drilling tool outer annulus circulation ΔP Pa ; The drill nozzle pressure drop ΔP is calculated by formula (5): b ; （1） In formula (1), k Pi is the uncorrected drilling tool internal circulation pressure loss coefficient, a dimensionless quantity; L P is the drilling tool length, m; Q is the drilling fluid displacement, L / s; （3） In formula (3), k Pa is the uncorrected drilling tool outer annulus circulation pressure loss coefficient, a dimensionless quantity; （2） In formula (2), ρ d is the drilling fluid density, g / cm 3 ;μ Pv is the plastic viscosity, MPa·s; d Pi is the inner diameter of the drill bit, mm; （4） In formula (4), d P is the outer diameter of the drill bit, mm; d h is the borehole diameter, mm; （5） In formula (5), A j is the drill nozzle cross-sectional area, mm 2 ; The correction coefficient introduction module (13) is used to introduce the drill tool internal circulation pressure loss correction coefficient α and the drill tool external annulus circulation pressure loss correction coefficient β into equations (1) and (3), and obtain equations (6) and (7); （6） In formula (6), ΔP Pi ' is the corrected pressure loss of the drill internal circulation, MPa; α is the correction coefficient of the pressure loss of the drill internal circulation, dimensionless quantity; （7） In formula (7), ΔP Pa ' is the corrected internal circulation pressure loss of drilling tool, MPa; β is the correction coefficient of the circulating pressure loss of the outer annulus of the drilling tool, which is a dimensionless quantity; A correction coefficient calculation module (14) is used to use the first measured vertical pressure P1 as a corrected first vertical pressure calculation value and the second measured vertical pressure P2 as a corrected second vertical pressure calculation value, obtain a binary linear equation group containing two unknowns α and β, and calculate a specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and a specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β; ; In the above system of linear equations of two variables: ΔP Pi1 ' is the calculated value of the corrected internal circulation pressure loss of the first drilling tool when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP Pa1 ' is the calculated value of the first drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the first depth under the condition of the first drilling fluid displacement Q1; ΔP b1 is the pressure drop of the first drill nozzle calculated by substituting Q1 into equation (5); ΔP Pi1 is the uncorrected calculated value of the first drilling tool internal circulation pressure loss obtained by substituting Q1 into formula (1); ΔP Pa1 is the uncorrected calculated value of the first drilling tool outer annulus circulation pressure loss obtained by substituting Q1 into formula (3); ΔP Pi2 ' is the calculated value of the second drilling tool internal circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP Pa2 ' is the calculated value of the second drilling tool outer annulus circulation pressure loss after correction when the drilling tool assembly drills to the second depth under the condition of the second drilling fluid displacement Q2; ΔP b2 is the pressure drop of the second drill nozzle calculated by substituting Q2 into equation (5); ΔP Pi2 is the uncorrected calculated value of the internal circulation pressure loss of the second drilling tool obtained by substituting Q2 into formula (1); ΔP Pa2 is the uncorrected calculated value of the second drilling tool outer annulus circulation pressure loss obtained by substituting Q2 into formula (3); A correction formula generation module (15) is used to bring the calculated specific value α0 of the drill tool internal circulation pressure loss correction coefficient α and the specific value β0 of the drill tool external annular circulation pressure loss correction coefficient β back to equation (6) and equation (7) respectively to obtain the corrected equation (6) and the corrected equation (7); A circulation pressure loss determination module (16), which is used to obtain equation (8) according to equation (5), the modified equation (6) and the modified equation (7), and then determine the modified circulation pressure loss calculation value when the drilling tool assembly drills to other depths under other drilling fluid displacement conditions Q3 based on equation (8); （8）; In formula (8), P is the corrected cycle pressure loss calculated value, MPa; α0 and β0 in formula (8) are both known values. Substituting Q3 into formula (1) to calculate ΔP in formula (8) Pi , substituting Q3 into equation (3) to calculate ΔP in equation (8) Pa , substituting Q3 into equation (5) to calculate ΔP in equation (8) b .

4. The device for determining drilling circulation pressure loss according to claim 3, characterized in that: In the cycle pressure loss calculation value and drill nozzle pressure drop calculation module (12), when there are multiple specifications of drilling tools at the same time, the final ΔP is obtained by adding up the calculated values ​​in sections. Pi and ΔP Pa Calculated value.

5. A device for determining drilling circulation pressure loss, characterized in that: include: A processor (23), the processor (23) being coupled to the memory (22); The memory (22) is used to store computer programs; The processor (23) is used to execute the computer program stored in the memory (22) so that the drilling circulation pressure loss determination device executes the drilling circulation pressure loss determination method according to claim 1 or 2.

6. A readable storage medium, characterized in that: The method comprises a program or an instruction. When the program or the instruction is run on a computer, the method for determining the drilling circulation pressure loss as claimed in claim 1 or 2 is executed.

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