CN113073953B - Drilling fluid outlet flow correction method - Google Patents
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- 239000012530 fluid Substances 0.000 title claims abstract description 243
- 238000005553 drilling Methods 0.000 title claims abstract description 241
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000012937 correction Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 93
- 238000005259 measurement Methods 0.000 claims description 24
- 239000000523 sample Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 13
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method for correcting the outlet flow of drilling fluid, which belongs to the technical field of drilling engineering and comprises the following steps: a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench; b. calculating the flow velocity v; c. calculating the area A of the overflowing section; d. calculating the perimeter C; e. calculating the hydraulic radius r of the non-full pipe diversion trenchh(ii) a f. Calculating the Reynolds number Re when the pipe is not full; g. calculating the friction coefficient f of the non-full pipe diversion trench; h. calculating and determining the outlet flow Q of the non-full pipe diversion trench; i. reversely determining the friction coefficient f' of the corrected non-full pipe diversion trench; flow Q at inlet of non-full-pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench. The invention considers the friction coefficient f of the non-full pipe diversion trench, and the accuracy is higher through outlet flow correction, thereby greatly improving the accuracy of subsequent early warning.
Description
Technical Field
The invention relates to the technical field of drilling engineering, in particular to a method for correcting the outlet flow of drilling fluid.
Background
With further exploration and development, most of oil and gas enrichment areas are concentrated in deep strata, and due to the narrow pressure window, the problem of overflow loss frequently occurs, so that the drilling well control risk is higher. If the outlet flow of the drilling fluid can be accurately monitored, help and early warning can be provided for early discovery of overflow leakage, and a basis is provided for accurate treatment measures to be made on site in advance. The non-full pipe outlet flow monitoring method applied to the conventional drilling site mainly comprises a contact type and a non-contact type. The baffle flowmeter has wide application, and the working principle of the baffle flowmeter is that the change of a resistor is caused mainly by the swing of the impact of outlet drilling fluid on a baffle, the obtained result is the percentage of the liquid in the pipe diameter, and then the percentage is converted into the outlet flow through a calculation formula. However, factors such as drilling fluid density, drilling fluid viscosity, solid phase adhesion and installation position all affect the measurement result, and the converted outlet flow error is large. The non-contact measuring method needs to measure the height and the flow rate of liquid, and the existing method is to install a radar height sensor and a speed measuring sensor respectively. The radar height sensor has high requirement on the reflectivity of a medium, meanwhile, the speed measuring sensor is usually in a contact type, but returned drilling fluid is a plurality of fluids with rock debris solid-phase particles, the speed sensor is damaged by long-time flushing, and the speed sensor cannot be guaranteed to be completely immersed by the fluids under the condition of non-full pipe, so that the outlet flow calculated by the method has errors.
Chinese patent publication No. CN 111456659a, published as 2020, 07, 28 discloses a monitoring method for monitoring overflow and leakage during drilling, which is characterized in that the monitoring method comprises the following steps:
acquiring drilling tool parameters, wherein the drilling tool parameters comprise drilling tool type, drilling tool length and drilling tool diameter; detecting a first distance, wherein the first distance is the distance from a first device to the drill floor surface, and the first device comprises a top drive or a hook; detecting a drilling fluid flow rate at a flow rate measurement of a second device, the second device comprising an annular blowout preventer or an anti-spill pipe; obtaining the outlet flow of the drilling fluid according to the drilling tool parameters, the first distance and the drilling fluid flow speed; and comparing the outlet flow of the drilling fluid with the inlet flow of the drilling fluid, sending out an overflow early warning under the condition that the outlet flow of the drilling fluid is greater than the inlet flow of the drilling fluid, and sending out a leakage early warning under the condition that the outlet flow of the drilling fluid is less than the inlet flow of the drilling fluid.
The monitoring method for monitoring overflow and leakage during drilling disclosed in the patent document can realize early warning of overflow and leakage of drilling. However, since the flow velocity of the drilling fluid is obtained through measurement, errors also exist, the finally obtained outlet flow of the drilling fluid is inaccurate, and the early warning accuracy is further influenced.
Disclosure of Invention
The invention provides a method for correcting the outlet flow of drilling fluid, which aims to overcome the defects of the prior art, and the method considers the friction coefficient f of a non-full pipe diversion trench, and corrects the outlet flow, so that the corrected outlet flow Q' of the non-full pipe diversion trench is closer to an inlet flow value, the accuracy is higher, and the accuracy of subsequent early warning is greatly improved.
The invention is realized by the following technical scheme:
a method for correcting the outlet flow of drilling fluid is characterized by comprising the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet guide groove by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, d is the inner diameter, and h is the drilling fluid at the outletThe liquid level in the diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by the formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full through formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7;
wherein Q is the outlet flow of the non-full pipe diversion trench, h1The height difference is represented by l, the length of the outlet diversion trench, f, the friction coefficient of the non-full pipe diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
In the step i, the inlet flow Q of the non-full pipe diversion trenchIntoAnd obtaining by inquiring logging data.
In the step i, the inlet flow Q of the non-full pipe diversion trenchIntoCalculated by equation 12Obtaining;
wherein Q isIntoThe flow rate of the inlet of the guide groove is not full, the water feeding efficiency of pump flushing is 0.95, the diameter of the cylinder sleeve is D, the stroke is L, and the number of flushes is n.
In the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All obtained by measuring with a tape measure.
In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench.
In the step a, the drilling fluid density rho is obtained by measuring through a weighing method.
In the step a, the viscosity mu of the drilling fluid is measured by a rotational viscometer.
The ultrasonic sensor is used for measuring, in particular, an ultrasonic probe of the ultrasonic sensor transmits an ultrasonic signal to the measured liquid surface, the ultrasonic wave is transmitted to the measured liquid surface by the ultrasonic probe and forms reflection on the liquid surface, and the reflected wave is transmitted to the ultrasonic probe along the original path and is received by the ultrasonic probe and converted into an electric signal; the height from the ultrasonic sensor to the bottom of the non-full pipe diversion groove is hGeneral assemblyWhen the ultrasonic sensor is installed, the measurement is carried out through a steel ruler, and the distance from the ultrasonic sensor to the liquid level is h2Monitoring by an ultrasonic sensor, and determining the liquid level h of the drilling fluid in the outlet diversion trench by a formula 8;
h＝hgeneral assembly-h2And (8).
The drilling fluid density rho is measured by a weighing method, specifically, the drilling fluid is firstly filled in a 600ml beaker, and the total mass m is weighed by using balance1Pouring part of the drilling fluid in the beaker into a measuring cylinder, measuring the volume V of the drilling fluid, and weighing the mass m of the residual drilling fluid in the beaker by using balance2(ii) a Finally, calculating the density of the drilling fluid according to the formula 9;
the method comprises the steps of measuring the viscosity mu of the drilling fluid by using a rotational viscometer, specifically, firstly, filling the drilling fluid into a 600ml beaker of a standard container for viscosity measurement, then, placing the beaker filled with the drilling fluid on a rotational viscometer instrument, then, immersing a rotor of the rotational viscometer into the drilling fluid in the beaker, starting a motor switch, rotating a speed change knob, reading a reading deflection angle a of a pointer of the rotational viscometer after 30 seconds, obtaining a coefficient K, and calculating the viscosity mu of the drilling fluid according to a formula 10;
μ ═ K · a formula 10.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the invention 'a' obtains the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench; b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1; c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2; d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3; e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h(ii) a f. Calculating the Reynolds number Re when the pipe is not full through formula 5; g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6; h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7; i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11; the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoComparing to obtain corrected outlet flow Q' ″ of the non-full pipe diversion trench, avoiding error caused by measurement because the flow velocity v of the drilling fluid in the outlet diversion trench is obtained by calculation, taking the friction coefficient f of the non-full pipe diversion trench obtained by calculation as a parameter for calculating the outlet flow Q of the non-full pipe diversion trench, and directly measuring by a baffle flowmeter in comparison with the prior artFor the obtained outlet flow value of the non-full pipe diversion trench, the friction coefficient f of the non-full pipe diversion trench is considered, namely, the flow loss is considered, and the outlet flow is corrected, so that the corrected outlet flow Q' of the non-full pipe diversion trench is closer to the inlet flow value, the accuracy is higher, and the accuracy of subsequent early warning is greatly improved, which is shown in fig. 1 and fig. 2.
2. In step i, the inlet flow Q of the non-full pipe diversion trenchIntoBy inquiring logging data, the data acquisition is easy and the operation is simple.
3. In step i, the inlet flow Q of the non-full pipe diversion trenchIntoThe calculation result is obtained by the calculation of the formula 12, and the water feeding efficiency problem of pump flushing is considered, so that the calculation result is the real pumping amount of the drilling well, and the influence of the water feeding efficiency is eliminated.
4. In the step b, the flow velocity v of the drilling fluid in the outlet diversion trench is calculated by the formula 1, so that the error caused by the flow velocity measured by the contact sensor can be effectively reduced; the flow cross section area A of the non-full pipe diversion trench in the step C and the perimeter C of the non-full pipe diversion trench in the step d, which is in contact with the pipe wall, on the flow cross section are both the hydraulic radius r of the non-full pipe diversion trenchhAnd in step e the hydraulic radius r of the non-full-pipe launderhDue to the particularity of the non-full pipe, the hydraulic radius of the non-full pipe diversion trench must be distinguished from the hydraulic radius of the full pipe to ensure the calculation accuracy, so the hydraulic radius r of the non-full pipe diversion trenchhThe method is a key parameter for calculating the Reynolds number Re when the pipe is not full, in the step g, because the friction coefficient f of the non-full pipe diversion trench is related to the Reynolds number Re when the pipe is not full, usually the flow state of the non-full pipe drilling fluid belongs to turbulence, the influence of the Reynolds number must be considered, and the outlet flow Q of the non-full pipe diversion trench comprehensively considers the influence of the drilling fluid performance, the basic parameters of the diversion trench, the hydraulic radius of the non-full pipe diversion trench and the friction coefficient f of the non-full pipe diversion trench, and all the parameters are mutually related, thereby better reflecting the influence of the non-full pipe drilling fluid on the comprehensive factors of flow calculation and effectively reducing the error of calculating the outlet flow of the non-full pipe diversion trench.
5. In step a, the length l of the outlet diversion trench is equal to the length of the inner diversion trenchDiameter d and height difference h1All obtain through the tape measure measurement, the guiding gutter of having considered every well has the difference, has avoided the influence of the difference of guiding gutter length, internal diameter and difference in height to the flow value.
6. In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through the ultrasonic sensor arranged on the outlet diversion trench, the accuracy of monitoring the liquid level can be ensured due to non-contact measurement, and the measurement of the height of the liquid level provides guarantee for the calculation of the area of the overflowing section of the non-full pipe diversion trench, the contact perimeter of the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench and the hydraulic radius of the non-full pipe diversion trench.
7. In the step a, the density rho of the drilling fluid is measured and obtained by a weighing method, and the influence of the performance of the drilling fluid on the friction of the pipe wall is considered, so that the friction coefficient of the non-full pipe diversion trench obtained by calculation is more accurate.
8. In the step a, the viscosity mu of the drilling fluid is measured and obtained through a rotational viscometer, so that the accuracy of the measured viscosity value of the drilling fluid can be guaranteed.
9. The ultrasonic sensor is used for measuring, in particular, an ultrasonic probe of the ultrasonic sensor transmits an ultrasonic signal to the measured liquid surface, the ultrasonic wave is transmitted to the measured liquid surface by the ultrasonic probe and forms reflection on the liquid surface, and the reflected wave is transmitted to the ultrasonic probe along the original path and is received by the ultrasonic probe and converted into an electric signal; the height from the ultrasonic sensor to the bottom of the non-full pipe diversion groove is hGeneral assemblyWhen the ultrasonic sensor is installed, the measurement is carried out through a steel ruler, and the distance from the ultrasonic sensor to the liquid level is h2The liquid level h of the drilling fluid in the outlet diversion trench is determined by the formula 8 through monitoring by the ultrasonic sensor, the liquid level is measured by the ultrasonic sensor in a non-contact manner, the measurement is free of abrasion, the precision is as high as 0.01mm, and the precision of calculating the flow velocity v of the drilling fluid in the outlet diversion trench can be further guaranteed.
Drawings
The invention will be further described in detail with reference to the drawings and the detailed description, wherein:
FIG. 1 is a graph comparing measurements using the present invention with a flapper flowmeter;
FIG. 2 is a graph comparing an outlet flow value after correction to an outlet flow value before correction according to the present invention;
wherein: c1 is a damper flowmeter measurement curve, C2 is a corrected outlet flow value curve of the invention, C3 is an inlet flow value curve, and C4 is a corrected outlet flow value curve of the invention.
Detailed Description
Example 1
A drilling fluid outlet flow correction method comprises the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1The height difference is represented by l, the length of the outlet diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full through formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7;
wherein Q is the outlet flow of the non-full pipe diversion trench, h1Is the height difference, l is the outletThe length of the diversion trench, f is the friction coefficient of the diversion trench not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
'a' and the length l, the inner diameter d and the height difference h of the outlet diversion groove are obtained1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench; b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1; c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2; d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3; e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h(ii) a f. Calculating the Reynolds number Re when the pipe is not full through formula 5; g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6; h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7; i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11; substituting the friction coefficient f' of the non-full diversion trench into formula 7 to obtain the outlet flow Q of the non-full diversion trench, and finally adding the outlet flow Q of the non-full diversion trench and the inlet flow Q of the non-full diversion trenchIntoComparing to obtain correctionThe flow rate v of the drilling fluid in the outlet diversion trench is obtained through calculation, so that errors caused by measurement are avoided, the calculated friction coefficient f of the non-full pipe diversion trench is used as a parameter for calculating the outlet flow Q of the non-full pipe diversion trench, compared with the outlet flow value of the non-full pipe diversion trench directly measured through a baffle flowmeter in the prior art, the corrected outlet flow Q' of the non-full pipe diversion trench is closer to the inlet flow value due to the fact that the friction coefficient f of the non-full pipe diversion trench is taken into consideration, namely, the flow loss is taken into consideration, and the outlet flow is corrected, so that the accuracy of subsequent early warning is greatly improved, and the reference is made to fig. 1 and fig. 2.
Example 2
A drilling fluid outlet flow correction method comprises the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1The height difference is represented by l, the length of the outlet diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full through formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7;
wherein Q is the outlet flow of the non-full pipe diversion trench, h1The height difference is represented by l, the length of the outlet diversion trench, f, the friction coefficient of the non-full pipe diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
In the step i, the inlet flow Q of the non-full pipe diversion trenchIntoAnd obtaining by inquiring logging data.
In the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All obtained by measuring with a tape measure.
In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench.
In step i, the inlet flow Q of the non-full-pipe diversion trenchIntoBy inquiring logging data, the data acquisition is easy and the operation is simple.
In the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All the flow guide grooves are obtained by measuring with a tape measure, the difference of the flow guide grooves of each well is considered, and the difference of the length, the inner diameter and the height difference of the flow guide grooves is avoidedInfluence of differential flow values.
In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench, the accuracy of monitoring the liquid level can be guaranteed due to non-contact measurement, and the measurement of the height of the liquid level provides guarantee for calculating the area of the overflowing section of the non-full pipe diversion trench, the contact perimeter of the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench and the hydraulic radius of the non-full pipe diversion trench.
Example 3
A drilling fluid outlet flow correction method comprises the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1The height difference is represented by l, the length of the outlet diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full through formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7;
wherein Q is the outlet flow of the non-full pipe diversion trench, h1Is a height difference, and l is an outlet diversion trenchThe length f is the friction coefficient of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
In the step i, the inlet flow Q of the non-full pipe diversion trenchIntoObtained by calculation of formula 12;
wherein Q isIntoThe flow rate of the inlet of the guide groove is not full, the water feeding efficiency of pump flushing is 0.95, the diameter of the cylinder sleeve is D, the stroke is L, and the number of flushes is n.
In the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All obtained by measuring with a tape measure.
In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench.
In the step a, the density rho of the drilling fluid is obtained by measuring through a weighing method.
In the step a, the viscosity mu of the drilling fluid is measured by a rotational viscometer.
In step i, the inlet flow Q of the non-full-pipe diversion trenchIntoThe calculation result is obtained by the calculation of the formula 12, and the water feeding efficiency problem of pump flushing is considered, so that the calculation result is the real pumping amount of the drilling well, and the influence of the water feeding efficiency is eliminated.
In the step a, the drilling fluid density rho is measured and obtained through a weighing method, and the influence of the performance of the drilling fluid on the friction of the pipe wall is considered, so that the friction coefficient of the non-full pipe diversion trench obtained through calculation is more accurate.
In the step a, the viscosity mu of the drilling fluid is obtained by measuring through a rotational viscometer, so that the accuracy of the measured viscosity value of the drilling fluid can be guaranteed.
Example 4
A method for correcting the outlet flow of drilling fluid comprises the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1The height difference is represented by l, the length of the outlet diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full by the formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7;
wherein Q is the outlet flow of the non-full pipe diversion trench, h1The height difference is represented by l, the length of the outlet diversion trench, f, the friction coefficient of the non-full pipe diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
In the step i, the inlet flow Q of the non-full pipe diversion trenchIntoObtained by calculation of formula 12;
wherein Q isIntoThe flow rate of the inlet of the guide groove is not full, the water feeding efficiency of pump flushing is 0.95, the diameter of the cylinder sleeve is D, the stroke is L, and the number of flushes is n.
In the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All obtained by measuring with a tape measure.
In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench.
In the step a, the drilling fluid density rho is obtained by measuring through a weighing method.
In the step a, the viscosity mu of the drilling fluid is measured by a rotational viscometer.
The ultrasonic sensor is used for measuring, in particular, an ultrasonic probe of the ultrasonic sensor transmits an ultrasonic signal to the measured liquid surface, the ultrasonic wave is transmitted to the measured liquid surface by the ultrasonic probe and forms reflection on the liquid surface, and the reflected wave is transmitted to the ultrasonic probe along the original path and is received by the ultrasonic probe and converted into an electric signal; the height from the ultrasonic sensor to the bottom of the non-full pipe diversion groove is hGeneral assemblyWhen the ultrasonic sensor is installed, the measurement is carried out through a steel ruler, and the distance from the ultrasonic sensor to the liquid level is h2Monitoring by an ultrasonic sensor, and determining the liquid level h of the drilling fluid in the outlet diversion trench by a formula 8;
h＝hgeneral assembly-h2And (8).
The ultrasonic sensor is used for measuring, in particular, an ultrasonic probe of the ultrasonic sensor transmits an ultrasonic signal to the measured liquid surface, the ultrasonic wave is transmitted to the measured liquid surface by the ultrasonic probe and forms reflection on the liquid surface, and a reflected wave is transmitted to the ultrasonic probe along an original path and is received by the ultrasonic probe and converted into an electric signal; the height from the ultrasonic sensor to the bottom of the non-full pipe diversion groove is hGeneral assemblyWhen the ultrasonic sensor is installed, the measurement is carried out through a steel ruler, and the distance from the ultrasonic sensor to the liquid level is h2The liquid level h of the drilling fluid in the outlet diversion trench is determined by the formula 8 through monitoring by the ultrasonic sensor, the liquid level is measured by the ultrasonic sensor in a non-contact manner, the measurement is free of abrasion, the precision is as high as 0.01mm, and the precision of calculating the flow velocity v of the drilling fluid in the outlet diversion trench can be further guaranteed.
Example 5
A drilling fluid outlet flow correction method comprises the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1The height difference is represented by l, the length of the outlet diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full through formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the flow Q of the outlet of the non-full pipe diversion trench is calculated and determined by the formula 7;
wherein Q is the flow rate of the outlet of the guide groove without full pipe, h1The height difference is represented by l, the length of the outlet diversion trench, f, the friction coefficient of the non-full pipe diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
friction of corrected non-full pipe diversion trenchThe resistance coefficient f' is brought into formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
In the step i, the inlet flow Q of the non-full pipe diversion trenchIntoObtained by calculation of formula 12;
wherein Q isGo intoThe flow rate of the inlet of the guide groove is not full, the water feeding efficiency of pump flushing is 0.95, the diameter of the cylinder sleeve is D, the stroke is L, and the number of flushes is n.
In the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All obtained by measuring with a tape measure.
In the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench.
In the step a, the drilling fluid density rho is obtained by measuring through a weighing method.
In the step a, the viscosity mu of the drilling fluid is measured by a rotational viscometer.
The ultrasonic sensor is used for measuring, in particular, an ultrasonic probe of the ultrasonic sensor transmits an ultrasonic signal to the measured liquid surface, the ultrasonic wave is transmitted to the measured liquid surface by the ultrasonic probe and forms reflection on the liquid surface, and the reflected wave is transmitted to the ultrasonic probe along the original path and is received by the ultrasonic probe and converted into an electric signal; the height from the ultrasonic sensor to the bottom of the non-full pipe diversion groove is hGeneral assemblyWhen the ultrasonic sensor is installed, the measurement is carried out through a steel ruler, and the distance from the ultrasonic sensor to the liquid level is h2Monitoring by an ultrasonic sensor, and determining the liquid level h of the drilling fluid in the outlet diversion trench by a formula 8;
h＝hgeneral assembly-h2And (8).
The drilling fluid density rho is measured by a weighing method, specifically, the drilling fluid density rho is measured by firstlyThe drilling fluid is filled in a 600ml beaker, and the total mass m is weighed out by balance1Pouring part of the drilling fluid in the beaker into a measuring cylinder, measuring the volume V of the drilling fluid, and weighing the mass m of the residual drilling fluid in the beaker by using balance2(ii) a Finally, calculating the density of the drilling fluid according to the formula 9;
the method comprises the steps of measuring the viscosity mu of the drilling fluid by using a rotational viscometer, specifically, firstly, filling the drilling fluid into a 600ml beaker of a standard container for viscosity measurement, then, placing the beaker filled with the drilling fluid on a rotational viscometer instrument, then, immersing a rotor of the rotational viscometer into the drilling fluid in the beaker, starting a motor switch, rotating a speed change knob, reading a reading deflection angle a of a pointer of the rotational viscometer after 30 seconds, obtaining a coefficient K, and calculating the viscosity mu of the drilling fluid according to a formula 10;
μ ═ K · a formula 10.
The coefficient K is obtained by table 1 lookup.
TABLE 1
In the step b, the flow velocity v of the drilling fluid in the outlet diversion trench is calculated by formula 1, so that the error caused by the flow velocity measured by the contact sensor can be effectively reduced; the flow cross section area A of the non-full pipe diversion trench in the step C and the perimeter C of the non-full pipe diversion trench in the step d, which is in contact with the pipe wall, on the flow cross section are both the hydraulic radius r of the non-full pipe diversion trenchhAnd in step e the hydraulic radius r of the non-full-pipe launderhDue to the particularity of the non-full pipe, the hydraulic radius of the non-full pipe diversion trench must be distinguished from the hydraulic radius of the full pipe to ensure the calculation accuracy, so the hydraulic radius r of the non-full pipe diversion trenchhIs a key parameter for calculating the Reynolds number Re when the pipe is not full, and the friction coefficient f of the guide flow groove of the pipe is related to the Reynolds number Re when the pipe is not full in the step g, so the flow of the drilling fluid of the pipe is not full normallyThe state belongs to turbulence, so the influence of Reynolds number must be considered, the outlet flow Q of the non-full pipe diversion trench comprehensively considers the performance of drilling fluid, basic parameters of the diversion trench, the hydraulic radius of the non-full pipe diversion trench and the friction coefficient f of the non-full pipe diversion trench, and all the parameters are correlated with each other, thereby better reflecting the influence of the non-full pipe drilling fluid on the comprehensive factors of flow calculation and effectively reducing the error of calculating the outlet flow of the non-full pipe diversion trench.
The invention is verified below with specific examples:
the length l of the diversion trench at the outlet of a well in Chongqing is 9.9m, the inner diameter d is 0.305m, and the height difference h1The measured liquid level height h of the drilling fluid in the outlet diversion trench is 9.32cm, and the drilling fluid density rho is 1.35g/cm3The viscosity mu of the drilling fluid is 48s, and the inlet flow Q of the guide groove of the non-full pipeIntoIs 50.8L/s.
1. Calculating by the formula 1 to obtain the flow velocity v of the drilling fluid in the outlet guide groove to be 2.66 m/s;
2. the flow cross-sectional area A of the non-full pipe diversion trench obtained by calculation of the formula 2 is 0.019m2；
3. Calculating by formula 3 to obtain the perimeter C of the contact between the fluid and the pipe wall on the flow passage section of the non-full pipe diversion trench, wherein the perimeter C is 0.354 m;
4. calculating by formula 4 to obtain the hydraulic radius r of the non-full pipe diversion trenchh0.052 m;
5. the Reynolds number Re at the time of non-full pipe was 9.021X 10 as calculated by equation 57；
6. The friction coefficient f of the non-full pipe diversion trench is calculated by the formula 6 and is 0.012;
7. calculating by the formula 7 to obtain 50L/s of the outlet flow Q of the non-full pipe diversion trench;
8. the friction coefficient f' of the corrected non-full pipe diversion trench calculated by the formula 11 is 0.0118;
9. calculating the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 7 and the inlet flow Q of the non-full pipe diversion trenchIntoAnd comparing to obtain the corrected outlet flow Q' of the non-full-pipe diversion trench of 50.77L/s.
As shown in fig. 1, the curve captures data of 160s in total at the drilling condition, well depth 315m, for a comparison of the measured value of the well baffle flowmeter and the calculated value of the outlet flow of the present invention, and no drilling abnormality such as overflow, stuck drilling and loss occurs during this time. The result of the measurement of the baffle flowmeter is directly used, the overall curve fluctuation is large, the real condition of the outlet flow cannot be reflected, the curve is always increased, the intercepted drilling working condition is not overflowed, the liquid level of the slurry tank is not increased, and the data error is large. The outlet flow calculated value obtained by adopting the method can reflect the fluctuation condition of normal outlet flow by a curve.
As shown in fig. 2, the corrected outlet flow Q' of the non-full diversion trench is closer to the inlet flow Q of the non-full diversion trench than the outlet flow Q of the non-full diversion trench before correctionGo into。
The invention can accurately correct the outlet flow of the drilling fluid, thereby greatly improving the early warning effect.
Claims (10)
1. A method for correcting the outlet flow of drilling fluid is characterized by comprising the following steps:
a. obtaining the length l, the inner diameter d and the height difference h of the outlet diversion trench1Obtaining the liquid level height h, the drilling fluid density rho and the drilling fluid viscosity mu of the drilling fluid in an outlet diversion trench;
b. calculating the flow velocity v of the drilling fluid in the outlet diversion trench by the formula 1;
wherein v is the flow velocity of the drilling fluid in the outlet diversion trench, and h1The height difference is represented by l, the length of the outlet diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
c. calculating the flow cross section area A of the non-full pipe diversion trench by the formula 2;
wherein A is the area of the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
d. calculating the perimeter C of the contact between the fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench by the formula 3;
c is the perimeter of the contact between fluid and the pipe wall on the overflowing section of the non-full pipe diversion trench, d is the inner diameter, and h is the liquid level height of the drilling fluid in the outlet diversion trench;
e. calculating the hydraulic radius r of the non-full pipe diversion trench by formula 4h；
Wherein r ishThe water power radius of the non-full pipe diversion trench is defined as A, the area of the flow cross section of the non-full pipe diversion trench is defined as A, and C is the perimeter of the flow on the flow cross section of the non-full pipe diversion trench, which is in contact with the pipe wall;
f. calculating the Reynolds number Re when the pipe is not full through formula 5;
wherein Re is Reynolds number when the pipe is not full, v is the flow velocity of the drilling fluid in the outlet diversion trench, rho is the density of the drilling fluid, and r ishThe hydraulic radius of the non-full pipe diversion trench is shown, and mu is the viscosity of the drilling fluid;
g. calculating the friction coefficient f of the non-full pipe diversion trench by the formula 6;
wherein f is the friction coefficient of the guide groove with non-full pipe, d is the inner diameter, and Re is the Reynolds number when the guide groove with non-full pipe is not full;
h. the outlet flow Q of the non-full pipe diversion trench is determined by calculation according to formula 7;
wherein Q is the outlet flow of the non-full pipe diversion trench, h1The height difference is represented by l, the length of the outlet diversion trench, f, the friction coefficient of the non-full pipe diversion trench, d, the inner diameter and h, the liquid level height of the drilling fluid in the outlet diversion trench;
i. obtaining the inlet flow Q of the non-full pipe diversion trenchIntoReversely determining the friction coefficient f' of the corrected non-full pipe diversion trench by the formula 11;
wherein f' is the friction coefficient of the corrected non-full pipe diversion trench, and h1Is the height difference, l is the length of the outlet diversion trench, QIntoThe flow rate of the inlet of the guide groove is not full of pipe, d is the inner diameter, and h is the liquid level height of the drilling fluid in the guide groove of the outlet;
the friction drag coefficient f' of the corrected non-full pipe diversion trench is brought into the formula 7 to obtain the outlet flow Q of the non-full pipe diversion trench, and finally the outlet flow Q of the non-full pipe diversion trench and the inlet flow Q of the non-full pipe diversion trenchGo intoAnd comparing to obtain the corrected outlet flow Q' of the non-full pipe diversion trench.
2. The method for correcting the outlet flow of drilling fluid according to claim 1, wherein the method comprises the following steps: in the step i, the inlet flow Q of the non-full pipe diversion trenchIntoAnd obtaining by querying logging data.
3. A drilling fluid outlet stream according to claim 1A method of volume correction characterized by: in the step i, the inlet flow Q of the non-full pipe diversion trenchIntoObtained by calculation of formula 12;
wherein Q isIntoThe flow rate of the inlet of the guide groove is not full, the water feeding efficiency of pump flushing is 0.95, the diameter of the cylinder sleeve is D, the stroke is L, and the number of flushes is n.
4. The method for correcting the outlet flow of drilling fluid according to claim 1, wherein the method comprises the following steps: in the step a, the length l, the inner diameter d and the height difference h of the outlet diversion trench1All obtained by measuring with a tape measure.
5. The method for correcting the outlet flow of drilling fluid according to claim 1, wherein the method comprises the following steps: in the step a, the liquid level h of the drilling fluid in the outlet diversion trench is measured and obtained through an ultrasonic sensor arranged on the outlet diversion trench.
6. The method for correcting the outlet flow of drilling fluid according to claim 1, wherein the method comprises the following steps: in the step a, the drilling fluid density rho is obtained by measuring through a weighing method.
7. The method for correcting the outlet flow of drilling fluid according to claim 1, wherein the method comprises the following steps: in the step a, the viscosity mu of the drilling fluid is measured by a rotational viscometer.
8. The method for correcting the outlet flow of drilling fluid according to claim 5, wherein the method comprises the following steps: the ultrasonic sensor is used for measuring specifically that an ultrasonic probe of the ultrasonic sensor emits an ultrasonic signal to the measured liquid surface, the ultrasonic wave is transmitted to the measured liquid surface from the ultrasonic probe to form reflection on the liquid surface, and the reflected wave is transmitted to the ultrasonic probe along the original path and is transmitted to the ultrasonic probe by the ultrasonic probeReceiving and converting the signal into an electric signal; the height from the ultrasonic sensor to the bottom of the non-full pipe diversion groove is hGeneral assemblyWhen the ultrasonic sensor is installed, the measurement is carried out through a steel ruler, and the distance from the ultrasonic sensor to the liquid level is h2Monitoring by an ultrasonic sensor, and determining the liquid level h of the drilling fluid in the outlet diversion trench by a formula 8;
h＝hgeneral assembly-h2And (8).
9. The method for correcting the outlet flow of the drilling fluid according to claim 6, wherein the method comprises the following steps: the drilling fluid density rho is measured by a weighing method, specifically, the drilling fluid is firstly filled in a 600ml beaker, and the total mass m is weighed by using balance1Pouring part of the drilling fluid in the beaker into a measuring cylinder, measuring the volume V of the drilling fluid, and weighing the mass m of the residual drilling fluid in the beaker by using balance2(ii) a Finally, calculating the density of the drilling fluid according to the formula 9;
10. the method for correcting the drilling fluid outlet flow according to claim 7, wherein the method comprises the following steps: the method comprises the steps of measuring the viscosity mu of the drilling fluid by using a rotational viscometer, specifically, firstly, filling the drilling fluid into a 600ml beaker of a standard container for viscosity measurement, then, placing the beaker filled with the drilling fluid on a rotational viscometer instrument, then, immersing a rotor of the rotational viscometer into the drilling fluid in the beaker, starting a motor switch, rotating a speed change knob, reading a reading deflection angle a of a pointer of the rotational viscometer after 30 seconds, obtaining a coefficient K, and calculating the viscosity mu of the drilling fluid according to a formula 10;
μ ═ K · a formula 10.
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