CN109386279A - A kind of pit shaft gas incursion check method and system - Google Patents
A kind of pit shaft gas incursion check method and system Download PDFInfo
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- CN109386279A CN109386279A CN201710675175.6A CN201710675175A CN109386279A CN 109386279 A CN109386279 A CN 109386279A CN 201710675175 A CN201710675175 A CN 201710675175A CN 109386279 A CN109386279 A CN 109386279A
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000005553 drilling Methods 0.000 claims abstract description 115
- 239000012530 fluid Substances 0.000 claims abstract description 72
- 238000006073 displacement reaction Methods 0.000 claims abstract description 39
- 238000002604 ultrasonography Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 21
- 230000002708 enhancing effect Effects 0.000 claims description 6
- 238000013500 data storage Methods 0.000 claims description 5
- 210000000352 storage cell Anatomy 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 83
- 239000007788 liquid Substances 0.000 description 11
- 238000012806 monitoring device Methods 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 7
- 210000002445 nipple Anatomy 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000034994 death Effects 0.000 description 1
- 231100000517 death Toxicity 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B47/107—Locating fluid leaks, intrusions or movements using acoustic means
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Abstract
A kind of pit shaft gas incursion check method and system, wherein this method comprises: Step 1: obtaining the ultrasound examination waveform detected at the slave drilling fluid return line under the current drilling fluid displacement and current drilling fluid displacement in drilling process；Step 2: determining ultrasonic wave reference waveform according to current drilling fluid displacement；Step 3: ultrasound examination waveform is compared with ultrasonic wave reference waveform, judge whether gas cut occurs in pit shaft according to comparison result.This method detects gas cut by detecting, analyzing the frequency variation of ultrasonic wave, to achieve the purpose that carry out early detection to pit shaft gas cut and find gas cut in time, it is not influenced by the low-frequency sound wave that drillstring vibrations in drilling process generate, this also allows for testing result is not influenced by drilling state, so that obtained testing result is more accurate.
Description
Technical field
The present invention relates to petroleum works technical fields, specifically, being related to a kind of pit shaft gas incursion check method and system.
Background technique
In drilling process, when the pressure of mineshaft annulus drilling fluid is less than formation pore pressure, present in formation pore
The gases such as natural gas will invade in mineshaft annulus, so that gas cut occur.After gas invades drilling fluid, at shaft bottom because by top
The pressure of fluid column, gas volume very little.But with returning in circulation of drilling fluid, head of liquid suffered by gas reduces, volume meeting
Gradually expand, especially close to ground when gas expansion faster.
Gas expansion occupies annulus space after gas cut, and it is excessive and return out well head that this will cause in annular space drilling fluid, in annular space
Head of liquid can reduce rapidly, further result in gas cut aggravation, blowout finally occurs, or even the case where blowout out of control occur.
Particularly, if containing H in the natural gas of gas cut2S or CO2, Field Force's injures and deaths are easily caused after blowout.
Therefore, land and ocean platform well drilling operation site require to carry out gas cut real-time monitoring, and gas cut discovery is more early,
Controllability is higher, and risk is also lower.
Summary of the invention
To solve the above problems, the present invention provides a kind of pit shaft gas incursion check methods, which comprises
Step 1: obtaining the slave drilling fluid return under the current drilling fluid displacement and current drilling fluid displacement in drilling process
The ultrasound examination waveform detected at pipeline；
Step 2: determining ultrasonic wave reference waveform according to the current drilling fluid displacement；
Step 3: the ultrasound examination waveform is compared with ultrasonic wave reference waveform, judged according to comparison result
Whether gas cut occurs in pit shaft.
According to one embodiment of present invention, in the step 3, by the frequency of the ultrasound examination waveform and/or
Acoustic pressure is compared with the frequency of the ultrasonic wave reference waveform and/or acoustic pressure, judges the frequency difference and/or acoustic pressure difference
Whether corresponding preset difference value threshold value is greater than, wherein if it is greater, then determining that gas cut occurs in pit shaft.
According to one embodiment of present invention, the method also includes:
Step a, it after drilling fluid pump reaches discharge capacity stabilization, obtains and is examined at drilling fluid return line under current drilling fluid displacement
The ultrasonic wave waveform measured determines ultrasonic wave waveform when occurring without gas cut under current drilling fluid displacement, obtains current drilling fluid
Ultrasonic wave reference waveform under discharge capacity；
Step b, drilling fluid displacement is adjusted by several times and repeats step a, obtains the ultrasonic wave ginseng under different drilling fluid displacements
Examine waveform.
The present invention also provides a kind of pit shaft gas incursion check system, the system using described in any item methods as above into
Row pit shaft gas incursion check.
According to one embodiment of present invention, the system comprises:
Ultrasonic wave generating means are arranged between drilling rod and drill bit, corresponding with drilling fluid displacement super for generating
Sound wave；
Ultrasonic detection device is arranged at the drilling fluid return line of ground well head, for detecting ultrasonic signal,
Obtain ultrasound examination waveform；
Data processing equipment is connect with the ultrasonic detection device, for according to the current drilling fluid row got
It measures and determines ultrasonic wave reference waveform, and the ultrasound examination waveform is compared with ultrasonic wave reference waveform, according to comparing
As a result judge whether gas cut occurs in pit shaft.
According to one embodiment of present invention, the ultrasonic wave generating means include pulse speed enhancing apparatus, and the pulse mentions
The first end of speed variator is connect with the drilling rod, and second end is connect with the drill bit.
According to one embodiment of present invention, the data processing equipment is configured to the frequency of the ultrasound examination waveform
Rate and/or acoustic pressure are compared with the frequency of the ultrasonic wave reference waveform and/or acoustic pressure, judge the frequency difference and/or
Whether acoustic pressure difference is greater than corresponding preset difference value threshold value, wherein if it is greater, then determining that gas cut occurs in pit shaft.
According to one embodiment of present invention, the data processing equipment includes data storage cell, the data storage
The ultrasonic wave reference waveform being stored in unit under different drilling fluid displacements.
Pit shaft gas incursion check method and system provided by the present invention are using pulse speed-raising tool in the drilling well course of work
In generated ultrasonic wave detect in pit shaft whether gas cut to occur.This method and system are by drilling speed and gas incursion check phase
In conjunction with, using impulse tool realize drilling process in bottom hole pressure surge pressurization to improve bit speed while, also utilize
The ultrasonic wave that impulse tool generates in drilling well pressurization returns to this feature of well head from shaft bottom along the drilling fluid in annular space,
Frequency by detecting, analyzing ultrasonic wave changes to detect to gas cut, so that reaching drilling process improves rate of penetration
Early detection is carried out to pit shaft gas cut simultaneously and finds the purpose of gas cut in time.
Compared to existing pit shaft gas incursion check system, pulse that this system directly utilizes situ of drilling well to use is raised speed work
Tool does not need to install special tool(s) and equipment on well drilling pipe column in well, reduces so as to avoid because influencing drilling fluid flowing
Bottom hydraulic efficiency.The arrangement implementation method of the system is simple, safe and reliable, and construction cost is more compared with conventional method and technology
It is low.
In addition, this system is examined by monitoring the ultrasonic wave of specific frequency caused by ultrasonic wave generating means in well head
Gas cut is surveyed, is not influenced by the low-frequency sound wave that drillstring vibrations in drilling process generate, this also allows for the detection knot of this system
Fruit is not influenced by drilling state, so that obtained testing result is more accurate.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.Objectives and other advantages of the present invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is required attached drawing in technical description to do simple introduction:
Fig. 1 is the structural schematic diagram of pit shaft gas incursion check system according to an embodiment of the invention；
Fig. 2 is the structural schematic diagram of pulsing jet pressurization speed-raising pipe nipple according to an embodiment of the invention；
Fig. 3 is the wave of ultrasonic wave caused by ultrasonic wave generating means under a fixed displacement according to an embodiment of the invention
Shape figure；
Fig. 4 is influence curve schematic diagram of the acoustic speed according to an embodiment of the invention by voidage size；
Fig. 5 is that gas cut occurs in pit shaft according to an embodiment of the invention and the ultrasonic wave detected when gas cut does not occur
Comparison of wave shape figure；
Fig. 6 is the implementation process schematic diagram of pit shaft gas incursion check method according to an embodiment of the invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
Meanwhile in the following description, for illustrative purposes and numerous specific details are set forth, to provide to of the invention real
Apply the thorough understanding of example.It will be apparent, however, to one skilled in the art, that the present invention can not have to tool here
Body details or described ad hoc fashion are implemented.
In addition, step shown in the flowchart of the accompanying drawings can be in the department of computer science of such as a group of computer-executable instructions
It is executed in system, although also, logical order is shown in flow charts, and it in some cases, can be to be different from herein
Sequence execute shown or described step.
Comprehensive logging instrument data presented is relied on applied to the monitoring well kick method overwhelming majority of well drilling operation site at present,
Since the measurement of these parameters is carried out in well head, if gas cut occurs, gas is returned on close to well head at this time, this method pair
In gas cut discovery not in time, it is possible to so that risk aggravation is even caused blowout.And field application based on Ke Liao formula quality
The precise measurement method of the rate of discharge of flowmeter and the well kick early monitoring method based on PWD etc., or still there is certain property delayed,
Or, the erroneous judgement degree higher defect larger in the presence of the difficulty of identification due to the interference of complicated factor in drilling process.
For example, there are a kind of dresses for determining gas cut position in drilling process based on pressure wave time difference in prior art
It sets.The device using surge throttle valve events generation pressure wave as wave source, pass through detection standpipe pressure sensor and casing pressure
The time difference that sensor receives pressure wave judges whether that gas cut occurs.But during actual well drilled, the vibration of drill string is not
Avoidable ground can generate influence of fluctuations to casing pressure, therefore the reliability of this method is poor, influence its to the detection of gas cut with
And the calculating of gas cut position.
In addition, there is also gas cut early monitoring device, the device in a kind of drilling process including well in prior art
Monitoring device in lower monitoring device and well.Wherein, down-hole monitoring device is used for acoustic attenuation data, temperature to mineshaft annulus fluid
Degree evidence and pressure data carry out real-time measurement and analog-to-digital conversion, monitoring device on well are then forwarded to, by monitoring device on well
Monitoring data are analyzed and processed, early warning and alarm are carried out.The monitoring device needs the additionally installation monitoring on down-hole string
Device pipe nipple and device is complex, also will affect drilling fluid flowing reduces bottom hydraulic efficiency.On down-hole monitoring device and well
Monitoring device transmits data by the 1HZ mud-pulse of conversion, and the data volume that this data transfer mode can transmit is small, together
When drilling process in the vibration of drill string also will affect its stability.
For the above problem in the presence of the prior art, the present invention provides a kind of new pit shaft gas incursion check method with
And the pit shaft gas incursion check system of pit shaft gas incursion check, this method and system are carried out with this method and passes through the change of analysis ultrasonic wave
Change to be detected to gas cut, to achieve the purpose that carry out pit shaft gas cut early detection to find gas cut in time.
Fig. 1 shows the structural schematic diagram of gas incursion check system provided by the present embodiment.As shown in Figure 1, the present embodiment
In, gas incursion check system includes: ultrasonic wave generating means 1, ultrasonic detection device 2 and data processing equipment 3.Wherein, surpass
Sound wave generating means 1 are arranged between drilling rod and drill bit, are used to generate ultrasonic wave corresponding with drilling fluid displacement.And it is ultrasonic
Wave detection device 2 is arranged at the drilling fluid return line of ground well head, the ultrasound line letter for being used to carry out drilling fluid transmission
It number is detected, obtains ultrasound examination waveform.
In the present embodiment, ultrasonic wave generating means 1 preferably include pulse speed enhancing apparatus, wherein pulse speed enhancing apparatus
First end is connect with drilling rod, and second end is connect with drill bit.Specifically, as shown in Fig. 2, in the present embodiment, pulse speed enhancing apparatus is excellent
Selection of land is pressurized speed-raising pipe nipple using pulsing jet to realize, pulsing jet pressurization speed-raising pipe nipple is mounted on drill bit top, drilling fluid
After the upper female connector 201 inflow pipe nipple, under the synergy of impeller 202 and self-oscillation chamber 203, the type of flow
Vibratory impulse flowing can be modulated to by Traditional continuous flow is dynamic.Under outflow after female connector 204, drilling fluid can be exported in bit nozzle
Place forms pulse cavitating jet, to realize the drilling speed using pulsing jet.
During pulsing jet is pressurized the pressurization speed-raising of speed-raising pipe nipple, as shown in figure 3, drilling fluid can vibrate generation simultaneously
The ultrasonic wave of certain frequency.Under different drilling fluid displacements, the frequency of ultrasonic wave caused by pulsing jet pressurization speed-raising pipe nipple will
It is different.
In the present embodiment, by the drilling well pulse speed-raising tool for directly situ of drilling well being utilized to use, which is not needed
Special tool(s) and equipment are installed, so as to effectively avoid reducing shaft bottom water because influencing drilling fluid flowing in well on well drilling pipe column
Force efficiency.
Certainly, in other embodiments of the invention, ultrasonic wave generating means 1 can also using other reasonable devices or
Equipment realizes that the invention is not limited thereto.
Ultrasonic wave caused by ultrasonic wave generating means 1 will be propagated in drilling fluid from shaft bottom to well head.Due to liquid
Compressibility possessed by gas in the inertia and drilling fluid of body, propagation of the sound wave in gassiness or gas-free drilling fluid
Speed differs greatly.
After formation gas invades pit shaft, can exist in the form of bubble in shaft bottom, the stream for the biphase gas and liquid flow that shaft bottom is formed
Type is bubble flow.Sound wave in liquid from when traveling in gas, because compressed gas can consume part sound energy, at this time
Acoustic speed can reduce.And sound wave is in gas from when traveling in liquid, because liquid has biggish effect of inertia, this
When acoustic speed can reduce again.
Gas is invaded in pit shaft in upward migration process, since drilling liquid pressure is gradually reduced, gas volume gradually becomes
Greatly.The flow pattern of biphase gas and liquid flow successively becomes plug-like stream, stratified flow, wave flow, slug flow and annular flow, and air void rate is therewith
Increase.As shown in figure 4, acoustic speed is reduced with the increase of voidage, acoustic speed declines very when voidage is very low
Fastly, as the increase sound wave decrease speed of voidage is gradually reduced.After voidage is greater than 50% or so, acoustic speed is with gap
The increase of rate and increase.
As shown in figure 5, after occurring gas cut in pit shaft, due in drilling fluid gas for ultrasonic transmission speed and sound
Can influence, ultrasonic detection device 2 the ultrasonic wave that well head detects with when no gas cut can the ultrasound detected
Wave is compared, and frequency and acoustic pressure, which can all exist, to be substantially reduced.
In the present embodiment, ultrasonic detection device 2 can incite somebody to action after detecting the ultrasonic signal that drilling fluid transmits
To ultrasonic testing signals be transmitted to the data processing equipment 3 being attached thereto.And data processing equipment 3 also can be according to connecing
The wave character of the ultrasonic wave received judges whether pit shaft occurs gas cut.
Fig. 6 is shown data processing equipment in the present embodiment and is carried out using pit shaft gas incursion check method provided by the present invention
The implementation process schematic diagram of pit shaft gas incursion check.
As shown in fig. 6, the waveform due to ultrasonic wave is related to drilling fluid displacement, data processing equipment 3 can be in step
Ultrasonic detection device 2 is obtained under the current drilling fluid displacement and current drilling fluid displacement in drilling process in S601 from drilling well
The ultrasonic wave waveform (i.e. ultrasound examination waveform) detected at liquid reflux pipeline.
Then, data processing equipment 3 understands the current drilling fluid displacement according to getting to determine ultrasonic wave ginseng at this time
Examine waveform.Specifically, in the present embodiment, data processing equipment 3 includes data storage cell, is stored in the data processing unit
There are ultrasonic wave reference waveform detected under different drilling fluid displacements, i.e., different drilling fluid displacements and its corresponding no gas cut
Ultrasonic wave waveform when generation.
In the present embodiment, in order to get ultrasonic wave waveform when occurring under different drilling fluid displacements without gas cut, the system
Ultrasonic wave generating means 1 can be detected using ultrasonic detection device 2 after drilling fluid pump reaches a fixed displacement and stablizes drilling
Caused by this time and the ultrasonic wave of well head is transmitted to by drilling fluid and at the ultrasound signal transmission to data that will test
Manage device 3.Data processing equipment 3 can determine drilling fluid displacement when no gas cut occurs according to the ultrasonic signal received
Under ultrasonic wave waveform, and by the ultrasonic wave wave setting be the drilling fluid displacement under comparison plate (i.e. ultrasonic wave reference wave
Shape).Then, which can adjust by several times drilling fluid displacement and repeat the above steps, to obtain under different drilling fluid displacements
Ultrasonic wave reference waveform.Data processing equipment 3 can refer to obtained different drilling fluid displacements and its corresponding ultrasonic wave
Waveform storage is in the data storage cell of itself, to be read out calling in subsequent pit shaft gas incursion check.
As shown in fig. 6, data processing equipment 3, after obtaining ultrasound examination waveform and ultrasonic wave reference waveform, meeting exists
Ultrasound examination waveform is compared with ultrasonic wave reference waveform in step S603, and judges current well according to comparative structure
Whether gas cut occurs in cylinder.
As analyzing above, after occurring gas cut in pit shaft, due in drilling fluid gas for ultrasonic transmission
Speed and sound can influence, the ultrasonic wave that well head detects with when no gas cut can the ultrasonic wave phase detected
Can all exist than, frequency and acoustic pressure and be substantially reduced.Therefore in the present embodiment, data processing equipment 3 in step S603 also
The frequency of ultrasound examination waveform and/or acoustic pressure can be compared with the frequency of ultrasonic wave reference waveform and/or acoustic pressure, be sentenced
Whether disconnected frequency difference and/or acoustic pressure difference are greater than corresponding preset difference value threshold value.Wherein, if frequency difference or acoustic pressure difference
Greater than corresponding preset difference value threshold value, then data processing equipment 3 also it is determined that occur gas cut at this time in pit shaft；Conversely,
If frequency difference harmony pressure difference no more than corresponding difference threshold, data processing equipment 3 also it is determined that this
When pit shaft in there is no gas cuts.
It should be pointed out that in different embodiments of the invention, above-mentioned predeterminated frequency difference value threshold value and/or default acoustic pressure
Difference threshold can be configured to different reasonable values according to the actual situation, the present invention not to predeterminated frequency difference value threshold value and/or
The specific value of default acoustic pressure difference threshold is defined.
As can be seen that pit shaft gas incursion check method and system provided by the present embodiment utilize pulse from foregoing description
Speed-raising tool generated ultrasonic wave drilling well works during detects in pit shaft whether gas cut occurs.This method and system
Drilling speed is combined with gas incursion check, bottom hole pressure surge is pressurized to improve in using impulse tool realization drilling process
While bit speed, drilling well of the ultrasonic wave also generated in drilling well pressurization using impulse tool from shaft bottom in annular space
This feature of well head is returned on liquid, the frequency by detecting, analyzing ultrasonic wave changes to detect to gas cut, to reach brill
Early detection is carried out to pit shaft gas cut while well process improves rate of penetration and finds the purpose of gas cut in time.
Compared to existing pit shaft gas incursion check system, the drilling well pulse that this system directly utilizes situ of drilling well to use is raised speed
Tool does not need to install special tool(s) and equipment on well drilling pipe column in well, drops so as to avoid because influencing drilling fluid flowing
Low bottom hydraulic efficiency.The arrangement implementation method of the system is simple, safe and reliable, and construction cost is more compared with conventional method and technology
It is low.
In addition, this system is examined by monitoring the ultrasonic wave of specific frequency caused by ultrasonic wave generating means in well head
Gas cut is surveyed, is not influenced by the low-frequency sound wave that drillstring vibrations in drilling process generate, this also allows for the detection knot of this system
Fruit is not influenced by drilling state, so that obtained testing result is more accurate.
It should be understood that disclosed embodiment of this invention is not limited to specific structure disclosed herein or processing step
Suddenly, the equivalent substitute for these features that those of ordinary skill in the related art are understood should be extended to.It should also be understood that
It is that term as used herein is used only for the purpose of describing specific embodiments, and is not intended to limit.
" one embodiment " or " embodiment " mentioned in specification means the special characteristic described in conjunction with the embodiments, structure
Or characteristic is included at least one embodiment of the present invention.Therefore, the phrase " reality that specification various places throughout occurs
Apply example " or " embodiment " the same embodiment might not be referred both to.
Although above-mentioned example is used to illustrate principle of the present invention in one or more application, for the technology of this field
For personnel, without departing from the principles and ideas of the present invention, hence it is evident that can in form, the details of usage and implementation
It is upper that various modifications may be made and does not have to make the creative labor.Therefore, the present invention is defined by the appended claims.
Claims (8)
1. a kind of pit shaft gas incursion check method, which is characterized in that the described method includes:
Step 1: obtaining under the current drilling fluid displacement and current drilling fluid displacement in drilling process from drilling fluid return line
The ultrasound examination waveform detected；
Step 2: determining ultrasonic wave reference waveform according to the current drilling fluid displacement；
Step 3: the ultrasound examination waveform is compared with ultrasonic wave reference waveform, pit shaft is judged according to comparison result
Inside whether gas cut occurs.
2. the method as described in claim 1, which is characterized in that in the step 3, by the ultrasound examination waveform
Frequency and/or acoustic pressure are compared with the frequency of the ultrasonic wave reference waveform and/or acoustic pressure, judge the frequency difference and/
Or whether acoustic pressure difference is greater than corresponding preset difference value threshold value, wherein if it is greater, then determining that gas cut occurs in pit shaft.
3. method according to claim 1 or 2, which is characterized in that the method also includes:
Step a, it after drilling fluid pump reaches discharge capacity stabilization, obtains and is detected at drilling fluid return line under current drilling fluid displacement
Ultrasonic wave waveform, determine ultrasonic wave waveform when occurring without gas cut under current drilling fluid displacement, obtain current drilling fluid displacement
Under ultrasonic wave reference waveform；
Step b, drilling fluid displacement is adjusted by several times and repeats step a, obtains the ultrasonic wave reference wave under different drilling fluid displacements
Shape.
4. a kind of pit shaft gas incursion check system, which is characterized in that the system is used as described in any one of claims 1 to 3
Method carry out pit shaft gas incursion check.
5. system as claimed in claim 4, which is characterized in that the system comprises:
Ultrasonic wave generating means are arranged between drilling rod and drill bit, for generating ultrasonic wave corresponding with drilling fluid displacement；
Ultrasonic detection device is arranged at the drilling fluid return line of ground well head, for detecting ultrasonic signal, obtains
Ultrasound examination waveform；
Data processing equipment is connect with the ultrasonic detection device, for true according to the current drilling fluid displacement got
Determine ultrasonic wave reference waveform, and the ultrasound examination waveform is compared with ultrasonic wave reference waveform, according to comparison result
Judge whether gas cut occurs in pit shaft.
6. system as claimed in claim 5, which is characterized in that the ultrasonic wave generating means include pulse speed enhancing apparatus, institute
The first end for stating pulse speed enhancing apparatus is connect with the drilling rod, and second end is connect with the drill bit.
7. such as system described in claim 5 or 6, which is characterized in that the data processing equipment is configured to the ultrasonic wave
The frequency and/or acoustic pressure of detection waveform are compared with the frequency of the ultrasonic wave reference waveform and/or acoustic pressure, judge the frequency
Whether rate difference and/or acoustic pressure difference are greater than corresponding preset difference value threshold value, wherein if it is greater, then determining to occur in pit shaft
Gas cut.
8. the system as described in any one of claim 5~7, which is characterized in that the data processing equipment includes that data are deposited
Storage unit, the ultrasonic wave reference waveform being stored in the data storage cell under different drilling fluid displacements.
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| CN201710675175.6A CN109386279B (en) | 2017-08-09 | 2017-08-09 | Shaft gas invasion detection method and system |
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| CN110185433A (en) * | 2019-05-16 | 2019-08-30 | 中国海洋石油集团有限公司 | A kind of marine riser gas cut monitoring device and method based on Spectral characteristics analysis method |
| CN111364979A (en) * | 2020-03-23 | 2020-07-03 | 中国石油大学(华东) | Underground gas invasion monitoring system based on ultrasonic waves |
| CN111608650A (en) * | 2020-07-09 | 2020-09-01 | 西安海联石化科技有限公司 | Method for detecting oil well oil pipe and casing pipe defects by using infrasonic waves |
| CN111927432A (en) * | 2020-09-03 | 2020-11-13 | 中国石油天然气集团有限公司 | Method for controlling stratum carbon dioxide to invade shaft |
| CN111980689A (en) * | 2020-09-03 | 2020-11-24 | 中国石油天然气集团有限公司 | Method for controlling stratum crude oil invading shaft by using underground hydrocarbon detection technology |
| CN111980666A (en) * | 2020-09-03 | 2020-11-24 | 中国石油天然气集团有限公司 | Method for controlling hydrogen sulfide invasion into shaft based on underground hydrocarbon detection technology |
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| CN112483074A (en) * | 2019-09-11 | 2021-03-12 | 中国石油化工股份有限公司 | Method and system for predicting gas invasion phenomenon in drilling process |
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| CN111980666A (en) * | 2020-09-03 | 2020-11-24 | 中国石油天然气集团有限公司 | Method for controlling hydrogen sulfide invasion into shaft based on underground hydrocarbon detection technology |
| CN111997597A (en) * | 2020-09-03 | 2020-11-27 | 中国石油天然气集团有限公司 | Method for controlling methane in stratum to invade shaft |
| CN111980689A (en) * | 2020-09-03 | 2020-11-24 | 中国石油天然气集团有限公司 | Method for controlling stratum crude oil invading shaft by using underground hydrocarbon detection technology |
| CN111927432A (en) * | 2020-09-03 | 2020-11-13 | 中国石油天然气集团有限公司 | Method for controlling stratum carbon dioxide to invade shaft |
| CN111980666B (en) * | 2020-09-03 | 2024-05-14 | 中国石油天然气集团有限公司 | Method for controlling invasion of hydrogen sulfide into shaft based on underground hydrocarbon detection technology |
| CN111980689B (en) * | 2020-09-03 | 2024-05-14 | 中国石油天然气集团有限公司 | Control method for stratum crude oil invaded into shaft by using underground hydrocarbon detection technology |
| CN115653573A (en) * | 2022-12-13 | 2023-01-31 | 中国石油大学(华东) | Casing pipe inside and outside bidirectional underground monitoring device and method based on elastic wave signals |
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