CN107060737B - While-drilling gas invasion simulation experiment device and experiment method - Google Patents
While-drilling gas invasion simulation experiment device and experiment method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000009545 invasion Effects 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 title claims abstract description 25
- 238000002474 experimental method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 83
- 239000002002 slurry Substances 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 73
- 238000012544 monitoring process Methods 0.000 claims description 39
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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
- E21B47/107—Locating fluid leaks, intrusions or movements using acoustic means
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Abstract
The embodiment of the application discloses while-drilling gas invasion simulation experiment device and experiment method, wherein the device includes gas-liquid conveying mechanism, pit shaft simulation experiment mechanism and data processing mechanism, wherein: the gas-liquid conveying mechanism comprises a gas-liquid mixer, a gas branch and a slurry branch, wherein the gas branch and the slurry branch are connected with the gas-liquid mixer; the slurry branch comprises a slurry tank, a heater and a plunger pump which are connected in sequence, and the plunger pump is connected with the gas-liquid mixer; the shaft simulation experiment mechanism comprises a Doppler ultrasonic principle experiment section and an underground overflow simulation test section; the data processing mechanism comprises a front-end amplifier, an analog-digital collector and a computer which are sequentially connected, and the front-end amplifier is connected with the shaft simulation experiment mechanism. The technical scheme provided by the application can provide data support for accurately and timely detecting the gas invasion.
Description
Technical Field
The application relates to the technical field of petroleum and natural gas exploration, in particular to a simulation experiment device and an experiment method for gas invasion while drilling.
Background
In the process of oil and gas exploration and development, blowout accidents can occur in the processes of drilling, oil testing, gas testing, oil production and gas production, the blowout accidents often cause serious damages such as fire, explosion, environmental pollution, casualties, equipment damage, oil and gas reservoir damage and the like, and the prevention and control of the blowout is the first important task for the safe operation of the oil and gas field exploration and development.
Flooding is a precursor to a blowout and occurs directly due to invasion of formation fluids (oil, gas, water) into the wellbore, with gas-invasion being the most harmful, among others. When the overflow occurs, if reasonable treatment measures can be found and taken in time, the occurrence of blowout accidents can be avoided or controlled, favorable conditions can be created for emergency rescue and well killing after the blowout occurs at the lowest, and the harm degree caused by the blowout is reduced. The timely discovery of oil gas water invasion (especially gas invasion) in the drilling process can win precious time for removing overflow and rebuilding pressure balance, and greatly reduces the difficulty of secondary well control, so that early overflow monitoring is one of the main technical means for realizing blowout prevention of oil gas wells.
The main overflow monitoring methods of land drilling at present include a mud pit liquid level increment method, a drilling fluid flow monitoring method, a sound wave gas invasion monitoring method, a gas invasion while drilling monitoring method and the like, and the methods can be classified into the ground and the underground from the installation position of a sensor. The ground monitoring method is characterized by simple and convenient operation, but the slurry pool liquid level increment method can carry out detection only after the slurry invaded by gas reaches the ground, so that the problem of alarm lag exists, the drilling fluid flow monitoring method is limited by the measurement precision of a sensor and the complexity of field working conditions, so that more false alarms exist, and the sound wave gas invasion monitoring method has the problem of judgment distortion due to the fact that sound wave signals are easily interfered and processed complicatedly. The underground gas invasion monitoring tool while drilling mostly adopts technologies such as formation testing while drilling, underground micro-flow measurement, underground temperature measurement and the like to identify gas invasion at present, the technologies rely on indirect parameter change caused by gas invasion to identify, when underground pressure abnormality, underground temperature abnormality and drilling fluid flow velocity abnormality are measured, alarm is triggered, and the problems of more false alarms and difficulty in calculating overflow quantity exist.
Disclosure of Invention
The purpose of the embodiment of the application is to provide a simulation while drilling gas invasion experimental device and an experimental method, which can provide data support for accurately and timely detecting gas invasion.
In order to achieve the above object, one aspect of the present application provides a simulation while drilling experimental apparatus, the apparatus includes a gas-liquid conveying mechanism, a wellbore simulation experimental mechanism, and a data processing mechanism, wherein: the gas-liquid conveying mechanism comprises a gas-liquid mixer, a gas branch and a slurry branch, wherein the gas branch and the slurry branch are connected with the gas-liquid mixer; the slurry branch comprises a slurry tank, a heater and a plunger pump which are connected in sequence, and the plunger pump is connected with the gas-liquid mixer; the shaft simulation experiment mechanism comprises a Doppler ultrasonic principle experiment section and an underground overflow simulation test section, wherein the Doppler ultrasonic principle experiment section comprises a cylinder body and an ultrasonic transceiver sensor probe arranged outside the cylinder wall of the cylinder body, and the cylinder body is filled with a mixture of slurry and gas; the underground overflow simulation test section comprises an upper barrel and a lower barrel, wherein a core support frame is arranged in the lower barrel, a core sample is placed on the core support frame, monitoring short sections are arranged in the upper barrel and the lower barrel, each monitoring short section comprises a battery section and a probe section, a PDC (polycrystalline diamond compact) bit is arranged at the lower end of each probe section, the PDC bits abut against the core sample, an ultrasonic receiving and transmitting sensor probe is arranged on each probe section, the probe sections are driven by a motor arranged above the upper barrel to rotate, and a mixture of slurry and gas is filled in the upper barrel and the lower barrel; the data processing mechanism comprises a front-end amplifier, an analog-digital collector and a computer which are sequentially connected, and the front-end amplifier is connected with the shaft simulation experiment mechanism.
Furthermore, a safety valve is arranged on the gas storage tank, a flow control valve and a mass flow meter are sequentially arranged between the gas storage tank and the gas-liquid mixer, and the mass flow meter is connected with the analog-digital collector through a signal line.
Furthermore, a liquid-gas separator used for separating mud and gas is arranged between the mud tank and the shaft simulation experiment mechanism, the input end of the liquid-gas separator is connected with the shaft simulation experiment mechanism, the output end of the liquid-gas separator is connected with the mud tank, and an exhaust hole is further formed in the liquid-gas separator.
Furthermore, an upper flange cover and a lower flange cover are respectively arranged at the upper end and the lower end of the cylinder body; an upper flange cover is arranged at the upper end of the upper barrel, a lower flange cover is arranged at the lower end of the lower barrel, a monitoring short section support frame is further arranged in the lower barrel, and the monitoring short section support frame is filled between the probe section and the barrel wall of the lower barrel so as to ensure the stability of the probe section when the probe section rotates; and the battery section is internally provided with a battery.
Furthermore, a pressure gauge and a thermometer are arranged on the upper barrel, and a safety valve mounting hole, a monitoring nipple mounting hole and a drain pipe opening are formed in an upper flange cover of the upper barrel; and a liquid inlet pipe and a liquid outlet pipe are arranged on the lower flange cover of the lower barrel.
In order to achieve the above object, the present application further provides a simulation while drilling experimental method, including: pressurizing air by an air compressor, storing the air into an air storage tank, and injecting air into the gas-liquid mixer through the air storage tank; heating the slurry in the slurry tank by a heater, and conveying the slurry into the gas-liquid mixer by a plunger pump so as to mix the slurry with gas in the gas-liquid mixer; injecting the gas-liquid mixture in the gas-liquid mixer into a shaft simulation experiment mechanism, and providing a propagation channel containing a gas-liquid interface for an ultrasonic signal generated by an ultrasonic emission probe; receiving an ultrasonic signal reflected by a gas-liquid interface through an ultrasonic receiving probe, converting the received ultrasonic signal into an electric signal, amplifying the electric signal by a front-end amplifier, and digitally sampling the amplified electric signal by an analog-digital collector; and analyzing the digitally sampled signals to determine the law of influence of a gas-liquid interface on the change of the Doppler signals and the law of retransmission and attenuation of ultrasonic waves in the slurry.
Further, after generating the ultrasonic signals transmitted in the gas-liquid interface and in the mud, respectively, the method further comprises: inputting the gas-liquid mixture in the shaft simulation experiment mechanism into a liquid-gas separator to separate gas in the gas-liquid mixture from mud, and discharging the separated gas out of the liquid-gas separator; and conveying the degassed slurry back to the slurry tank.
Further, after injecting the gas-liquid mixture in the gas-liquid mixer into a wellbore simulation experiment mechanism, the method further comprises: starting a motor in the shaft simulation experiment mechanism to drive a probe section in the shaft simulation experiment mechanism to rotate; when the probe section rotates, a core sample placed on the core supporting frame is ground through a PDC drill bit at the lower end of the probe section so as to simulate a vibration noise signal.
Further, the method further comprises: and a monitoring nipple support frame is arranged between the probe section and the inner wall of the shaft simulation experiment mechanism so as to ensure the stability of the probe section when the probe section rotates.
Further, the method further comprises: and a graphite pad is arranged at the contact part of the monitoring nipple support frame and the probe section so as to reduce the friction force generated when the probe section rotates.
It can be seen from the above that this application is through setting up gas branch and mud branch road, after mixing air and mud in the gas-liquid mixer, can simulate the emergence of gas invasion. The gas-liquid mixture of air and mud is injected into a shaft simulation experiment mechanism, ultrasonic signals are transmitted into the gas-liquid mixture, and the ultrasonic signals transmitted in the gas-liquid mixture are analyzed, so that the influence of a gas invasion environment on the ultrasonic signals can be determined. In addition, this application is through utilizing monitoring nipple joint simulation vibration noise signal, can simulate ultrasonic signal and possess the propagation condition under the background noise condition to can laminate true drilling environment more, and then can provide data support for accurate, timely gas invasion detection.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a simulation experiment device for gas invasion while drilling according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of an experimental section of the Doppler ultrasound principle in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a well underflow simulation test section according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of an upper barrel of a simulated test section of underflow in an embodiment of the present application;
FIG. 5 is a schematic view of a lower cylinder of a simulated test section of underflow in an embodiment of the present application;
FIG. 6 is a flowchart of a simulation experiment method for gas invasion while drilling according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application shall fall within the scope of protection of the present application.
The application provides a simulation experiment device is invaded to while drilling gas, the device includes gas-liquid conveying mechanism, pit shaft simulation experiment mechanism and data processing mechanism. Please refer to fig. 1 to 3, wherein:
the gas-liquid conveying mechanism comprises a gas-liquid mixer 6, and a gas branch and a slurry branch which are connected with the gas-liquid mixer 6, the gas branch comprises an air compressor 1 and an air storage tank 3 which are sequentially connected, and the air storage tank 3 is connected with the gas-liquid mixer 6; the slurry branch comprises a slurry tank 9, a heater 8 and a plunger pump 7 which are connected in sequence, and the plunger pump 7 is connected with the gas-liquid mixer 6.
The shaft simulation experiment mechanism comprises a doppler ultrasound principle experiment section and a downhole overflow simulation test section, please refer to fig. 2, the doppler ultrasound principle experiment section comprises a cylinder and an ultrasonic transceiver sensor probe 27 arranged outside the cylinder wall of the cylinder, and the cylinder is filled with a mixture 29 of slurry and gas.
Referring to fig. 3, the downhole overflow simulation test section includes an upper barrel, a lower barrel 17 and a core support frame 23 arranged in the lower barrel 17, a core sample 24 placed on the core support frame 23, monitoring nipples arranged in the upper barrel 16 and the lower barrel 17 and including a battery section 22 and a probe section 21, a PDC (Polycrystalline Diamond Compact) bit 25 arranged at the lower end of the probe section 21, the PDC bit 25 abutting against the core sample 24, an ultrasonic transceiver probe 27 arranged on the probe section 21, the probe section 21 driven by a motor 20 arranged above the upper barrel 16 to rotate, and the upper barrel 16 and the lower barrel 17 filled with a mixture of slurry and gas.
The data processing mechanism comprises a front-end amplifier 13, an analog-digital collector 14 and a computer 15 which are sequentially connected, and the front-end amplifier 13 is connected with the shaft simulation experiment mechanism.
In this embodiment, a safety valve 2 is disposed on the gas tank 3, a flow control valve 4 and a mass flow meter 5 are sequentially disposed between the gas tank 3 and the gas-liquid mixer 6, and the mass flow meter 5 is connected to the modulus acquirer 14 through a signal line 10.
In this embodiment, a liquid-gas separator 11 for separating mud and gas is disposed between the mud tank 9 and the wellbore simulation experiment mechanism, an input end of the liquid-gas separator 11 is connected to the wellbore simulation experiment mechanism, an output end of the liquid-gas separator 11 is connected to the mud tank 9, and an exhaust hole (not shown) is further disposed on the liquid-gas separator 11.
Referring to fig. 2, in the present embodiment, an upper flange cover 18 and a lower flange cover 19 are respectively disposed at the upper end and the lower end of the cylinder. Referring to fig. 3, an upper flange cover 18 is disposed at the upper end of the upper cylinder 16, a lower flange cover 19 is disposed at the lower end of the lower cylinder 17, a monitoring nipple support frame 26 is further disposed in the lower cylinder 17, and the monitoring nipple support frame 26 is filled between the probe section 21 and the cylinder wall of the lower cylinder 17 to ensure the stability of the probe section 21 when the probe section 21 rotates; the battery segment 22 has a battery 28 mounted therein.
Referring to fig. 4, in the present embodiment, a pressure gauge 30 and a temperature gauge 31 are disposed on the upper cylinder 16, and a safety valve mounting hole 35, a monitoring nipple mounting hole 34, and a drain pipe opening 36 are disposed on the upper flange cover 19 of the upper cylinder 16; referring to fig. 5, a liquid inlet pipe 32 and a liquid outlet pipe 33 are disposed on the lower flange cover 19 of the lower cylinder 17.
Specifically, as shown in fig. 1, the fluid delivery part of the present invention is composed of an air compressor 1, an air storage tank 3, a mud tank 9, a plunger pump 7, a gas-liquid mixer 6, a heater 8, a wellbore simulation experiment section 12, a liquid-gas separator 11, and the like. Air is pressurized by an air compressor 1 and then stored in an air storage tank 3, slurry in a slurry tank 9 is heated by a heater 8 and then is conveyed by a plunger pump 7, the slurry is mixed with compressed air in a gas-liquid mixer 6 and then enters a shaft simulation experiment section 12 to carry out an experiment, and the mixture is degassed by a liquid-gas separator 11 and then circulates back to the slurry tank.
The working condition data acquisition, transmission, processing and control part of the invention comprises a mass flowmeter 5, a thermometer 31, a pressure gauge 30, an analog-digital collector 14, a computer 15 and the like; the method comprises the steps of acquiring parameters such as real-time gas flow, gas-liquid mixture temperature and pressure through a mass flow meter, a thermometer and a pressure gauge, displaying real-time working conditions on a computer through an analog-digital collector and a recording, analyzing and displaying system, adjusting parameters such as the opening of a flow control valve 4, the power of a heater 8, the flow of a plunger pump 7 and the rotating speed of a motor 20 through a controller and an executing mechanism, and controlling simulation conditions such as temperature, pressure, flow speed and vibration of a shaft simulation experiment section.
The ultrasonic Doppler signal testing, acquiring and processing part of the invention consists of an ultrasonic receiving and transmitting sensor probe 27, a front-end amplifier 13, an analog-digital collector 14 and a computer 15; after being received by a receiving probe, an ultrasonic signal transmitted by an ultrasonic transmitting sensor probe is collected into Doppler signal analysis software through a front-end amplifier and an analog-digital collector, and the relation between the gas content and the Doppler frequency shift is determined through the technical research of denoising, characteristic value extraction and the like in the time frequency domain.
In the embodiment, a sealing ring can be arranged between the cylinder body of the Doppler ultrasonic principle experiment section and the upper and lower flange covers 18 and 19 to ensure high-pressure sealing. The inside of the cylinder body is a liquid-gas mixture, the ultrasonic transceiver sensor probe 27 is fixed outside the cylinder body, and by adjusting the type, flow rate, density, temperature, pressure, gas content and other parameters of the inside liquid-gas mixture and selecting probes with different fundamental frequencies and powers, the influence rule of a gas-liquid interface on Doppler signal change and the retransmission and attenuation rule of ultrasonic waves in slurry are relatively researched, so that basic data are provided for the design and development of the gas invasion monitoring nipple.
In this embodiment, the downhole overflow simulation test section is composed of an upper cylinder body 16, a lower cylinder body 17, an upper flange cover 18, a lower flange cover 19, a monitoring nipple, a motor 20 and the like, and the specific use method is as follows: a rock core supporting frame 23 is fixedly arranged in the lower cylinder body 17, a rock core sample 24 with the thickness of about 10cm is fixedly placed on the rock core supporting frame, a monitoring nipple is arranged on the rock core supporting frame, and a monitoring nipple supporting frame 26 with a graphite pad (friction reducing) arranged inside is used for pressurizing and encircling the monitoring nipple to fix the monitoring nipple, so that the monitoring nipple is prevented from swinging when rotating; the upper cylinder 16 is connected to the lower cylinder 17 by bolts, and upper and lower flange covers 18, 19 are mounted. The upper part of the monitoring nipple is connected with a motor 20, and a rock core sample 24 is ground through a PDC drill bit 25, so that a vibration noise signal during drilling can be simulated. The method simulates the underground high-temperature, high-pressure, rotary and vibrating environment by adjusting the parameters of the liquid-gas mixture such as temperature, pressure, flow pattern, gas content, density and the like, provides experimental conditions for the research of Doppler signal processing technologies such as background noise resistance, characteristic signal extraction and the like, and can also carry out the experiments of the reliability, temperature resistance, pressure resistance, endurance and the like of the short section.
Referring to fig. 6, the present application further provides a simulation while drilling experimental method, including:
s1: pressurizing air by an air compressor, storing the air into an air storage tank, and injecting air into the gas-liquid mixer through the air storage tank;
s2: heating the slurry in the slurry tank by a heater, and conveying the slurry into the gas-liquid mixer by a plunger pump so as to mix the slurry with gas in the gas-liquid mixer;
s3: injecting the gas-liquid mixture in the gas-liquid mixer into a shaft simulation experiment mechanism, and providing a propagation channel containing a gas-liquid interface for an ultrasonic signal generated by an ultrasonic emission probe;
s4: receiving an ultrasonic signal reflected by a gas-liquid interface through an ultrasonic receiving probe, converting the received ultrasonic signal into an electric signal, amplifying the electric signal by a front-end amplifier, and digitally sampling the amplified electric signal by an analog-digital collector;
s5: and analyzing the digitally sampled signals to determine the law of influence of a gas-liquid interface on the change of the Doppler signals and the law of retransmission and attenuation of ultrasonic waves in the slurry.
In this embodiment, after generating the ultrasonic signals transmitted in the gas-liquid interface and in the slurry, respectively, the method further comprises:
inputting the gas-liquid mixture in the shaft simulation experiment mechanism into a liquid-gas separator to separate gas in the gas-liquid mixture from mud, and discharging the separated gas out of the liquid-gas separator;
and conveying the degassed slurry back to the slurry tank.
In this embodiment, after injecting the gas-liquid mixture in the gas-liquid mixer into a wellbore simulation experiment mechanism, the method further comprises:
starting a motor in the shaft simulation experiment mechanism to drive a probe section in the shaft simulation experiment mechanism to rotate;
when the probe section rotates, a core sample placed on the core supporting frame is ground through a PDC drill bit at the lower end of the probe section so as to simulate a vibration noise signal.
In this embodiment, the method further comprises:
and a monitoring nipple support frame is arranged between the probe section and the inner wall of the shaft simulation experiment mechanism so as to ensure the stability of the probe section when the probe section rotates.
In this embodiment, the method further comprises:
and a graphite pad is arranged at the contact part of the monitoring nipple support frame and the probe section so as to reduce the friction force generated when the probe section rotates.
It can be seen from the above that this application is through setting up gas branch and mud branch road, after mixing air and mud in the gas-liquid mixer, can simulate the emergence of gas invasion. The gas-liquid mixture of air and mud is injected into a shaft simulation experiment mechanism, ultrasonic signals are transmitted into the gas-liquid mixture, and the ultrasonic signals transmitted in the gas-liquid mixture are analyzed, so that the influence of a gas invasion environment on the ultrasonic signals can be determined. In addition, this application is through utilizing monitoring nipple joint simulation vibration noise signal, can simulate ultrasonic signal and possess the propagation condition under the background noise condition to can laminate true drilling environment more, and then can provide data support for accurate, timely gas invasion detection.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, with respect to the embodiments of the method, reference may be made to the introduction of the embodiments of the device described above for a comparative explanation.
The foregoing description of various embodiments of the present application is provided for the purpose of illustration to those skilled in the art. It is not intended to be exhaustive or to limit the invention to a single disclosed embodiment. As described above, various alternatives and modifications of the present application will be apparent to those skilled in the art to which the above-described technology pertains. Thus, while some alternative embodiments have been discussed in detail, other embodiments will be apparent or relatively easy to derive by those of ordinary skill in the art. This application is intended to cover all alternatives, modifications, and variations of the invention that have been discussed herein, as well as other embodiments that fall within the spirit and scope of the above-described application.
Although the present application has been described in terms of embodiments, those of ordinary skill in the art will recognize that there are numerous variations and permutations of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and permutations without departing from the spirit of the application.
Claims (10)
1. The gas invasion while drilling simulation experiment device is characterized by comprising a gas-liquid conveying mechanism, a shaft simulation experiment mechanism and a data processing mechanism, wherein:
the gas-liquid conveying mechanism comprises a gas-liquid mixer, a gas branch and a slurry branch, wherein the gas branch and the slurry branch are connected with the gas-liquid mixer; the slurry branch comprises a slurry tank, a heater and a plunger pump which are connected in sequence, and the plunger pump is connected with the gas-liquid mixer;
the shaft simulation experiment mechanism comprises an underground overflow simulation test section, wherein the underground overflow simulation test section comprises a cylinder; the core sample monitoring device comprises a barrel body, a core supporting frame and a monitoring nipple, wherein the core supporting frame is arranged in the lower barrel body, the core sample is placed on the core supporting frame, the monitoring nipple is arranged in the upper barrel body and the lower barrel body and comprises a battery section and a probe section, a PDC (polycrystalline diamond compact) bit is arranged at the lower end of the probe section and abuts against the core sample, an ultrasonic receiving and transmitting sensor probe is arranged on the probe section, the probe section is driven by a motor arranged above the upper barrel body to rotate, and a mixture of slurry and gas is filled in the upper barrel body and the lower barrel body;
the data processing mechanism comprises a front-end amplifier, an analog-digital collector and a computer which are sequentially connected, and the front-end amplifier is connected with the shaft simulation experiment mechanism.
2. The device of claim 1, wherein a safety valve is arranged on the gas storage tank, a flow control valve and a mass flow meter are sequentially arranged between the gas storage tank and the gas-liquid mixer, and the mass flow meter is connected with the analog-digital collector through a signal line.
3. The device as claimed in claim 1, wherein a liquid-gas separator for separating mud and gas is arranged between the mud tank and the shaft simulation experiment mechanism, the input end of the liquid-gas separator is connected with the shaft simulation experiment mechanism, the output end of the liquid-gas separator is connected with the mud tank, and an exhaust hole is further arranged on the liquid-gas separator.
4. The device as claimed in claim 1, wherein an upper flange cover is arranged at the upper end of the upper cylinder body, a lower flange cover is arranged at the lower end of the lower cylinder body, a monitoring nipple support frame is further arranged in the lower cylinder body, and the monitoring nipple support frame is filled between the probe section and the cylinder wall of the lower cylinder body so as to ensure the stability of the probe section when the probe section rotates; and the battery section is internally provided with a battery.
5. The device of claim 1, wherein the upper cylinder is provided with a pressure gauge and a temperature gauge, and the upper flange cover of the upper cylinder is provided with a safety valve mounting hole, a monitoring nipple mounting hole and a drain pipe opening hole; and a liquid inlet pipe and a liquid outlet pipe are arranged on the lower flange cover of the lower barrel.
6. An experimental method applied to the gas invasion while drilling simulation experimental device as claimed in any one of claims 1 to 5, wherein the method comprises the following steps:
pressurizing air by an air compressor, storing the air into an air storage tank, and injecting air into the gas-liquid mixer through the air storage tank;
heating the slurry in the slurry tank by a heater, and conveying the slurry into the gas-liquid mixer by a plunger pump so as to mix the slurry with gas in the gas-liquid mixer;
injecting the gas-liquid mixture in the gas-liquid mixer into a shaft simulation experiment mechanism, and providing a propagation channel containing a gas-liquid interface for an ultrasonic signal generated by an ultrasonic emission probe;
receiving an ultrasonic signal reflected by a gas-liquid interface through an ultrasonic receiving probe, converting the received ultrasonic signal into an electric signal, amplifying the electric signal by a front-end amplifier, and digitally sampling the amplified electric signal by an analog-digital collector;
and analyzing the digitally sampled signals to determine the law of influence of a gas-liquid interface on the change of the Doppler signals and the propagation and attenuation law of the ultrasonic waves in the slurry.
7. The method of claim 6, wherein after generating the ultrasonic signals transmitted in the gas-liquid interface and in the mud, respectively, the method further comprises:
inputting the gas-liquid mixture in the shaft simulation experiment mechanism into a liquid-gas separator to separate gas in the gas-liquid mixture from mud, and discharging the separated gas out of the liquid-gas separator;
and conveying the degassed slurry back to the slurry tank.
8. The method of claim 6, wherein after injecting the gas-liquid mixture in the gas-liquid mixer into a wellbore simulation experiment facility, the method further comprises:
starting a motor in the shaft simulation experiment mechanism to drive a probe section in the shaft simulation experiment mechanism to rotate;
when the probe section rotates, a core sample placed on the core supporting frame is ground through a PDC drill bit at the lower end of the probe section so as to simulate a vibration noise signal.
9. The method of claim 8, further comprising:
and a monitoring nipple support frame is arranged between the probe section and the inner wall of the shaft simulation experiment mechanism so as to ensure the stability of the probe section when the probe section rotates.
10. The method of claim 9, further comprising:
and a graphite pad is arranged at the contact part of the monitoring nipple support frame and the probe section so as to reduce the friction force generated when the probe section rotates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710389080.8A CN107060737B (en) | 2017-05-26 | 2017-05-26 | While-drilling gas invasion simulation experiment device and experiment method |
Applications Claiming Priority (1)
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| CN113153263B (en) * | 2021-04-26 | 2024-05-10 | 中国石油天然气集团有限公司 | Underground overflow Doppler gas invasion monitoring device and method under high noise background |
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