CN112228047A - Method for judging drilling overflow and leakage - Google Patents
Method for judging drilling overflow and leakage Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 244000241872 Lycium chinense Species 0.000 claims abstract description 26
- 235000015468 Lycium chinense Nutrition 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 69
- 239000000523 sample Substances 0.000 claims description 67
- 238000005070 sampling Methods 0.000 claims description 16
- 210000001635 urinary tract Anatomy 0.000 claims description 16
- 208000019206 urinary tract infection Diseases 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 abstract description 15
- 238000005086 pumping Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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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
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention discloses a method for judging leakage of drilling fluid, which comprises the following steps of 1), obtaining wellhead return flow Q; 2) obtaining the actual displacement L under the rated pump strokeFruit of Chinese wolfberryAnd obtaining the theoretical discharge L of the slurry pump according to the pump stroke of the slurry pumpTheory of thingsThe pump efficiency p is L for mud pumpFruit of Chinese wolfberry/LTheory of things(ii) a 3) According to LFruit of Chinese wolfberry＝p*LTheory of thingsAutomatically correcting to obtain the actual discharge L of the slurry pump under different working statesFruit of Chinese wolfberry'; 4) mixing LFruit of Chinese wolfberry' comparing with the return discharge Q of the pipeline, and outputting the overflow and leakage judgment result. The method for judging the drilling overflow and leakage realizes the accurate judgment of the drilling overflow and leakage by means of a non-contact flow measurement mode, a slurry pump pumping efficiency accurate calibration method and combination of online measurement and real-time comparison of outlet flow of a slurry pump and wellhead return flow; can remarkably advance the time for discovering the overflow and leakage, is favorable for discovering the overflow and leakage condition on site and taking treatment measures, improves the safety of engineering operation, and is suitable for various drilling wellsAnd the method has wide application prospect.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a drilling overflow and leakage judging method.
Background
The well mouth return flow of the well is the most direct index of the overflow leakage analysis, the high-precision monitoring of the flow is realized, and the rapid discovery of the overflow leakage is facilitated. At present, 8L03 type outlet flow meters are commonly used by a drilling team, and the device adopts contact measurement, has the problems of poor measurement precision, large fluctuation and the like, and cannot provide quantitative analysis for field personnel.
Through analysis, the problem of large contact measurement error is mainly caused by the following reasons:
1. the density, viscosity, wave and liquid level of the drilling fluid flowing in all have important influence on the swing of the baffle plate, the change of the flow rate cannot be accurately defined, and the main reason of large error is.
2. During the measurement process, the solid phase of the drilling fluid is adhered to the baffle, so that the weight of the baffle is changed, and further continuous measurement errors are caused.
3. The different installation positions of the baffles cause different contact areas with the fluid, and the measurement accuracy is also influenced.
In response to the above problems, researchers have made a great deal of research and analysis.
For example, the patent number 201210156214.9 disclosed by the southwest university of petroleum is patent invention named as a device and a method for detecting the return flow of drilling fluid, the device is composed of one or more flow measurement short sections (5) arranged between a drilling fluid return opening (3) of a shaft and a vibrating screen (4), each flow measurement short section (5) comprises a rectangular cross section overflowing section (6) and bell mouth buffer sections positioned at two ends of the rectangular cross section overflowing section (6), a liquid level sensor (1) is arranged at the top of the rectangular cross section overflowing section (6), a flow velocity sensor (2) is arranged in liquid flow in the rectangular cross section overflowing section (6), and the liquid level sensor (1) and the flow velocity sensor (2) are respectively and electrically connected with a calculation and display alarm unit (8).
Although the detection device can realize real-time measurement of the flow rate returned from the wellhead, the detection device still has the following defects: 1. the wellhead anti-overflow pipe is required to be modified, so that the workload is large; 2. the flow velocity is measured in a contact mode, and the reliability is low after long-term use.
Also as patent No. 201811654241.2, entitled "a drilling fluid outlet flow quantitative detection device and drilling method", the invention provides a drilling fluid outlet flow quantitative detection device and a drilling fluid liquid level measurement method, including a radar liquid level measurement probe, a radar velocity measurement probe, a data acquisition module, an a/D conversion module, an upper computer, and an abnormal condition judgment model; the radar liquid level measurement and flow velocity measurement probe is used for measuring the liquid level height and the fluid flow velocity of the drilling fluid flowing in the drilling fluid overhead tank, and measured data are connected to the data acquisition module through a signal wire with a shield to finish the operations of signal acquisition, amplification, shaping, filtering, transmission and the like; a 485 bus or 4-20mA analog signal output mode is provided through an A/D conversion module and is accessed into upper computer software; the upper computer analyzes and processes the data, completes the functions of data/curve storage, printing, playback and the like, and simultaneously sends out an alarm signal to abnormal conditions through the judgment of the abnormal condition model; the method has very important significance for early warning of abnormal working conditions such as well kick, well leakage and the like and improving the well drilling safety.
The above patents mainly suffer from the following disadvantages: 1. the height correction means of the liquid level measuring probe is not provided, the probe and the pipeline measuring bottom surface are required to be in a vertical line during installation, the installation difficulty is high, and otherwise, the measured liquid level and the actual liquid level have deviation. 2. Meanwhile, in a working environment, the influence of vibration and the like exists, and the probe inevitably deviates. 3. The liquid level height and the flow velocity are respectively measured by two sensors, and the liquid level height and the flow velocity cannot be obtained from the same measuring point, so that the converted flow and the actual flow can have difference.
Disclosure of Invention
The invention provides a method for judging the overflow and leakage of a drilling well, aiming at the problems that the injection flow and the return flow of the existing well mouth are inaccurate in measurement, and the complicated conditions of the overflow and leakage cannot be accurately early warned and found.
The purpose of the invention is realized by the following technical scheme:
a method for judging drilling overflow and leakage comprises the following steps:
1) acquiring the discharge capacity Q of the wellhead return;
2) obtaining the actual displacement L under the rated pump strokeFruit of Chinese wolfberryAnd obtaining the theoretical discharge L of the slurry pump according to the pump stroke of the slurry pumpTheory of thingsIf the pump efficiency p is equal to L, the slurry pump will workFruit of Chinese wolfberry/LTheory of things；
3) According to LFruit of Chinese wolfberry＝p*LTheory of thingsAutomatically correcting to obtain the actual discharge L of the slurry pump under different working statesFruit of Chinese wolfberry'；
4) Comparing L at the same time acquisition PointFruit of Chinese wolfberry' returning discharge Q with the pipeline, outputting the overflow and leakage judgment result: if L isFruit of Chinese wolfberry' > Q, lost circulation; l isFruit of Chinese wolfberry' less than Q, overflow; l isFruit of Chinese wolfberry' -Q, normal.
Further, the acquisition of the wellhead return discharge capacity Q comprises the following steps:
A. opening a bypass pipe on a pipeline to be tested, arranging a signal probe device, and then carrying out hollow pipe centering to enable a probe positioned in the middle position in the signal probe device to find the lowest point of the pipeline;
B. respectively acquiring included angle data a between a probe transmitting line and the vertical direction and included angle data b between a pipeline and the vertical direction by adopting an angle sensor, and reading initial values H of distances from other probes to the bottom of the pipeline in a signal probe devicen；
C. Calibrating a probe to a pipeVertical distance H of bottomTrue：
HTrue＝Hn×sin(a+b)；
D. Reading the real-time distance measurement value h of each probe to the liquid level in the pipelinenAnd according to the above formula, obtaining the vertical distance h from each probe to the liquid level in the pipelineTrueAnd then the average liquid level height h in the pipeline is converted by using a least square methodLiquid for treating urinary tract infection；
E. Reading the real-time flow velocity measured value V detected by each probenAnd fitting the liquid flow velocity V according to the least square methodLiquid for treating urinary tract infection；
F. Dividing 1S into n sampling points according to the average liquid level height h in the pipelineLiquid for treating urinary tract infectionAnd the average liquid flow velocity VLiquid for treating urinary tract infectionAnd calculating the real-time micro flow q of the single sampling point, and superposing the real-time micro flows of the n sampling points to obtain the final real-time output flow q per second.
Further, the real-time micro-flow q of a single sampling point is calculated by the following formula:
order to
If R-hLiquid for treating urinary tract infectionIf greater than 0, then
If R-hLiquid for treating urinary tract infectionQ is 0.5 pi R2×VLiquid for treating urinary tract infection×t；
If R-hLiquid for treating urinary tract infectionIf less than 0, then
Wherein R is the inner diameter of the pipeline, and t represents the single sampling time.
Furthermore, when the hollow pipe is centered, the probe positioned in the middle horizontally moves and continuously transmits signals, the distance from the probe body to the bottom of the pipeline is measured through the time difference between the transmitted signals and the reflected signals, and when the distance reaches the maximum value, the distance is the lowest point of the pipeline.
Furthermore, the signal probe device is arranged on a shell connected with the bypass pipe, and the angle sensor comprises a first sensor and a second sensor which are arranged on the same installation plane with the signal probe device and are directly arranged on the pipeline; the signal probe device, the first angle sensor and the second angle sensor are respectively connected with a signal converter, and the signal converter is connected with the processor.
Furthermore, the shell is connected with the bypass pipe through a flange, and the shell is provided with a local hollow part at the sleeve position at the upper part of the flange.
The beneficial effects of this technical scheme are as follows:
1. in the invention, by means of a non-contact flow measurement mode, through a slurry pump pumping efficiency accurate calibration method and by combining online measurement and real-time comparison of slurry pump outlet flow and wellhead return flow, accurate judgment of drilling overflow and leakage is realized; the method can remarkably advance the time for discovering the overflow and leakage, is beneficial to timely discovering the overflow and leakage condition on site and taking treatment measures, improves the safety of engineering operation, is suitable for various drilling conditions, and has wide application prospect;
2. in the invention, the signal probe device is adopted to measure the liquid level height and the flow velocity signal simultaneously, so that the cost is lower and the measured flow is more accurate;
3. according to the invention, the angle sensor is adopted to automatically detect the angle between the probe and the pipeline to be detected, so that the real liquid level height is automatically corrected, the installation requirement is greatly reduced, and the field installation is more convenient;
4. in the invention, the flow measurement is processed in a discretization way by an integration method, the anti-interference capability is further improved, and the detection result is further accurate.
Drawings
The foregoing and following detailed description of the invention will be apparent when read in conjunction with the following drawings, in which:
FIG. 1 is a flow chart of drilling fluid leakage determination;
FIG. 2 is a flow chart of wellhead return flow measurement;
FIG. 3 is a schematic diagram of a process for discretizing a liquid flow;
FIG. 4 is a schematic diagram of an embodiment of wellhead return flow measurement;
FIG. 5 is a schematic view of the positional relationship of the signal probe device and the pipeline;
FIG. 6 is a principle of probe height correction;
in the figure:
1. the device comprises a pipeline, 2, a medium fluid, 3, a first angle sensor, 4, a second angle sensor, 5, a signal probe device, 6, a flange, 7, a hollow sleeve, 8, a cable, 9, a probe, 10, a shell, 11 and a sliding rail.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "vertical", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements that are referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment discloses a method for judging drilling overflow and leakage, which is used for realizing accurate judgment of drilling overflow and leakage by means of a non-contact flow measurement mode, a slurry pump pumping efficiency accurate calibration method and combination of online measurement and real-time comparison of slurry pump outlet flow and wellhead return flow.
As shown in figure 4, a bypass pipe is arranged on a pipeline to be tested, a shell is installed at the top of the bypass pipe through a flange, a local hollow part is arranged at the position, located on the upper portion of the flange, of a sleeve, steam of high-temperature drilling fluid is conveniently discharged, a signal probe device and an angle sensor are arranged in the shell, and a second sensor is arranged on the pipeline.
The signal probe device is used for detecting the height from the probe to the liquid level and the flow velocity signal of the liquid, and can adopt the implementation modes such as ultrasonic waves, radars, lasers and the like. The liquid level height can be obtained through the time difference between the emission signal and the reflection signal, the flow speed can be measured through the frequency difference (Doppler effect) between the emission signal and the reflection signal, and the measured liquid level height and the measured flow speed signal are subjected to integration processing to obtain the volume flow within 1s, so that the high-precision real-time flow can be obtained.
The signal probe device can comprise one or more probes, as shown in fig. 5, wherein the middle probe has the function of horizontal sliding, and the probe is centered with the lowest surface of the pipeline by adjusting the position of the probe.
The first angle sensor is used for detecting an included angle a between a probe transmitting line and the vertical direction, and the second angle sensor is used for detecting an included angle b between a pipeline and the vertical direction.
The angle sensor comprises a first sensor and a second sensor, wherein the first sensor and the second sensor are arranged on the same mounting plane of the signal probe device; the signal probe device, the first angle sensor and the second angle sensor are respectively connected with a signal converter, and the signal converter is connected with the processor. The signal converter is used for converting signals output by the signal probe device and the angle sensor into input signals which can be recognized by the processor; such as 4-20Ma, 0-10V, 485 serial ports and the like. In order to improve the measurement accuracy, a plurality of signal probe devices can be distributed on the pipeline, and the measurement error can be corrected through cross comparison.
When the drilling leakage is judged, the return discharge capacity Q of a well mouth and the actual discharge capacity L of a mud pump in different working states need to be acquired respectivelyFruit of Chinese wolfberry'，
As shown in fig. 2, the wellhead return displacement Q is obtained as follows:
firstly, carrying out hollow pipe centering, enabling a probe positioned in the middle position in a signal probe device to horizontally move and continuously transmit signals, measuring the distance from a probe body to the bottom of a pipeline through the time difference between the transmitted signals and the reflected signals, and obtaining the lowest point of the pipeline when the distance reaches the maximum value;
step two, adopting a first angle sensor and a second angle sensor to respectively acquire included angle data a between a probe transmitting line and the vertical direction and included angle data b between a pipeline and the vertical direction in the signal probe device, and reading initial quantity values H of distances from the rest probes in the signal probe device to the bottom of the pipelinen；
Step three, correcting the vertical distance H from the probe to the bottom of the pipeline according to the following formulaTrue：
HTrue＝HnX sin (a + b); (formula 1)
Step four, reading the real-time distance measurement value h of each probe to the liquid level height in the pipelinenAnd obtaining the vertical distance h from each probe to the liquid level in the pipeline according to the formula 1TrueCalculating the height H as max (H) of liquid level in pipeline measured by each probeTrue)-hTrueThen the average liquid level h in the pipeline is converted by a least square methodLiquid for treating urinary tract infection；
Step five, reading the real-time flow velocity measurement value V detected by each probenWherein n is 1,2,3,4Liquid for treating urinary tract infection；
Sixthly, dividing n sampling points within 1s and obtaining the average liquid level h in the pipelineLiquid for treating urinary tract infectionAnd the liquid flow velocity vLiquid for treating urinary tract infectionCalculating single real-time micro-flow q; and accumulating the n real-time flow rates to obtain the final real-time flow rate Q of the liquid in the pipeline. The real-time micro-flow q of a single sampling point is calculated by the following formula:
order to
If R-hLiquid for treating urinary tract infectionIf greater than 0, then
If R-hLiquid for treating urinary tract infectionQ is 0.5 pi R2×VLiquid for treating urinary tract infection×t；
If R-hLiquid for treating urinary tract infectionIf less than 0, then
Wherein R is the inner diameter of the pipeline, and t represents the single sampling time.
The discretization process of flow measurement is illustrated in fig. 3, where s represents the liquid cross-sectional area and d represents the distance traveled by the liquid during the sampling period. S is calculated by the liquid level height, d is the liquid flow velocity VLiquid for treating urinary tract infectionAnd the sampling time T, in the embodiment, 30 sampling points are divided in 1s, and the 30 real-time flow q is accumulated to obtain the product in the pipelineThe final real-time flow Q of the liquid.
As shown in fig. 1, the real-time displacement of the mud pump is obtained as follows:
step one, acquiring actual displacement L under rated pump strokeFruit of Chinese wolfberryAnd obtaining the theoretical discharge L of the slurry pump according to the pump stroke of the slurry pumpTheory of thingsThe pump efficiency p is L for mud pumpFruit of Chinese wolfberry/LTheory of things；
Step two, according to LFruit of Chinese wolfberry＝p*LTheory of thingsAutomatically correcting to obtain the actual discharge L of the slurry pump under different working statesFruit of Chinese wolfberry'；
Step three, collecting L at the same time pointFruit of Chinese wolfberry' comparing with the return discharge capacity Q of the pipeline, and outputting an overflow and leakage judgment result: if L isFruit of Chinese wolfberry' > Q, lost circulation; l isFruit of Chinese wolfberry' less than Q, overflow; l isFruit of Chinese wolfberry' -Q, normal.
Claims (6)
1. A method for judging drilling overflow and leakage is characterized by comprising the following steps:
1) acquiring the discharge capacity Q of the wellhead return;
2) obtaining the actual displacement L under the rated pump strokeFruit of Chinese wolfberryAnd obtaining the theoretical discharge L of the slurry pump according to the pump stroke of the slurry pumpTheory of thingsIf the pump efficiency p is equal to L, the slurry pump will workFruit of Chinese wolfberry/LTheory of things；
3) According to LFruit of Chinese wolfberry＝p*LTheory of thingsAutomatically correcting to obtain the actual discharge L of the slurry pump under different working statesFruit of Chinese wolfberry'；
4) Comparing L at the same time acquisition PointFruit of Chinese wolfberry' returning discharge Q with the pipeline, outputting the overflow and leakage judgment result: if L isFruit of Chinese wolfberry' > Q, lost circulation; l isFruit of Chinese wolfberry' less than Q, overflow; l isFruit of Chinese wolfberry' -Q, normal.
2. The method for distinguishing drilling overflow and leakage according to claim 1, wherein the obtaining of wellhead return displacement Q comprises the following steps:
A. opening a bypass pipe on a pipeline to be tested, arranging a signal probe device, and then carrying out hollow pipe centering to enable a probe positioned in the middle position in the signal probe device to find the lowest point of the pipeline;
B. respectively acquiring included angle data a between a probe transmitting line and the vertical direction and included angle data b between a pipeline and the vertical direction by adopting an angle sensor, and reading initial values H of distances from other probes to the bottom of the pipeline in a signal probe devicen；
C. Correcting the vertical distance H from the probe to the bottom of the pipelineTrue：
HTrue＝Hn×sin(a+b)；
D. Reading the real-time distance measurement value h of each probe to the liquid level in the pipelinenAnd according to the above formula, obtaining the vertical distance h from each probe to the liquid level in the pipelineTrueAnd then the average liquid level height h in the pipeline is converted by using a least square methodLiquid for treating urinary tract infection；
E. Reading the real-time flow velocity measured value V detected by each probenAnd fitting the liquid flow velocity V according to the least square methodLiquid for treating urinary tract infection；
F. Dividing 1S into n sampling points according to the average liquid level height h in the pipelineLiquid for treating urinary tract infectionAnd the average liquid flow velocity VLiquid for treating urinary tract infectionAnd calculating the real-time micro flow Q of the single sampling point, and superposing the real-time micro flows of the n sampling points to obtain the final real-time output flow Q per second.
3. The method according to claim 2, wherein the real-time micro-flow q at a single sampling point is calculated by the following formula:
order to
If R-hLiquid for treating urinary tract infectionIf greater than 0, then
If R-hLiquid for treating urinary tract infectionQ is 0.5 pi R2×VLiquid for treating urinary tract infection×t；
If R-hLiquid for treating urinary tract infectionIf less than 0, then
Wherein R is the inner diameter of the pipeline, and t represents the single sampling time.
4. The method of claim 2, wherein the method comprises: when the hollow pipe is centered, the probe positioned in the middle horizontally moves and continuously transmits signals, the distance from the probe body to the bottom of the pipeline is measured through the time difference between the transmitted signals and the reflected signals, and when the distance reaches the maximum value, the distance is the lowest point of the pipeline.
5. The method for judging the drilling overflow and leakage according to claim 2, wherein the signal probe device is installed on a shell connected with a bypass pipe, and the angle sensor comprises a first sensor and a second sensor, wherein the first sensor and the second sensor are arranged on the same installation plane of the signal probe device; the signal probe device, the first angle sensor and the second angle sensor are respectively connected with a signal converter, and the signal converter is connected with the processor.
6. The method as claimed in claim 5, wherein the housing is connected to the by-pass pipe via a flange, and the housing is provided with a partial hollow at a sleeve position on the upper part of the flange.
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| CN113073953A (en) * | 2021-03-23 | 2021-07-06 | 中国石油天然气集团有限公司 | Drilling fluid outlet flow correction method |
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