CN109779606A - A kind of hazard prediction method in oil/gas well approaches the working surface mining active process - Google Patents
A kind of hazard prediction method in oil/gas well approaches the working surface mining active process Download PDFInfo
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- CN109779606A CN109779606A CN201811615242.6A CN201811615242A CN109779606A CN 109779606 A CN109779606 A CN 109779606A CN 201811615242 A CN201811615242 A CN 201811615242A CN 109779606 A CN109779606 A CN 109779606A
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Abstract
The present invention proposes a kind of hazard prediction method in oil/gas well approaches the working surface mining active process, comprising: S1: choosing the coal working face that discarded oil/gas well closes in coal mine, collects the basic data of the working face；S2: according to the parameter for the coal working face being collected into, numerical modeling, the stress distribution situation of analysis coal working face air inlet crossheading and air return way are carried out.S3: the shear stress for taking steel pipe to determine that oil/gas well Casing Failure can bear.S4: the maximum shear stress that can bear by the maximum shear stress and oil gas casing that compare coal working face, to judge whether oil/gas well destroys.Hazard prediction method in oil/gas well approaches the working surface mining active process proposed by the present invention combines mechanics of materials detection and numerical value Modeling Calculation method, the hazard prediction to casing can be completed in laboratory, design and security protection to oil/gas well provide guidance.
Description
Technical field
The invention belongs to security technology areas, and in particular to the hazard prediction method of a kind of pair of oil/gas well.
Background technique
Oil/gas well is the information and substance channel excavated for exploration and development oil and gas resource.Oil/gas well
Well bore be mainly made of the cement sheath etc. outside conduit, surface pipe, protective casing, production string and each layer casing.Oil/gas well
Casing be generally steel pipe, it is living that creep properties stratum can generate extrusion stress, the tectonic stress on stratum, including formation fault to casing
Dynamic, subsurface seismic, crustal movement etc. can also destroy casing；Corrosive media (sulfate, H contained in stratum2S etc.) then accelerate
The damage of casing.Since the nineties, the casing damage that China oil field occurs is in rising trend always, causes safety and environment
The harm of aspect.Accurate, sensitive casing damage prediction technology is needed, design and security protection to oil/gas well provide finger
It leads.
Existing casing damage inspection technology has drifting proof method, stamp detection, thin-wall tube detection, packer to test set leakage
The methods of, above-mentioned detection method is required to oil/gas well field test, and cannot predict the damaged possibility of steel pipe in advance.
Summary of the invention
In order to solve the problems, such as that this field is inscrutable to the damage of oil gas casing, the object of the present invention is to provide a kind of oil
Hazard prediction method in gas well approaches the working surface mining active process.
Realize the technical solution of above-mentioned purpose of the present invention are as follows:
A kind of hazard prediction method in oil/gas well approaches the working surface mining active process, comprising:
S1: the coal working face that discarded oil/gas well closes on is chosen in coal mine, collects the basic data of the working face；
S2: according to the parameter for the coal working face being collected into, carrying out numerical modeling, analysis coal working face air inlet crossheading and
The stress distribution situation of air return way.
S3: taking the casing sample of oil/gas well in field with "nine squares", takes one section of steel pipe, does experiment and determines that oil/gas well Casing Failure can be held
The shear stress received.
S4: it is answered by the maximum shear that the maximum shear stress and oil gas casing that compare coal working face can bear
Power, to judge whether oil/gas well destroys.
Wherein, step S1 chooses away from discarded oil/gas well 180-300 meters of coal working face.
Wherein, basic data described in step S1, including mining height, day advance rate, Face Pressure Data.
Preferably, in step S2, FLAC is used3DSoftware carries out numerical modeling.
Wherein, constitutive model is established in step S2, the constitutive model is Ramberg-Osgood model, by right
FLAC3DSoftware Parameters of constitutive model calculates after carrying out assignment, setting constraint condition.
Wherein, by the way that peak value, the coverage of the lateral-supporting pressure of the coal working face is calculated in step S2
And the maximum shear stress.
Maximum principal stress suffered by oil gas casing is obtained by numerical simulation.A preferred technical solution of the present invention is,
The maximum shear stress of the coal working face is 165MPa, is located at unconsolidated formation and basement rock contact surface position.
Further, if judging, oil gas casing has been destroyed, and takes technical safety measures to ensure that the safety of coal mine is raw
It produces.
Oil gas casing has destroyed, then can cause accordingly toxic and harmful gas in oil/gas well, gas, crude oil, can
Combustion gas body, water etc. enter coal working face by crack, cause major safety risks.It just needs that safe practice is taken to arrange at this time
It applies.
The beneficial effects of the present invention are:
Hazard prediction method in oil/gas well approaches the working surface mining active process proposed by the present invention combines mechanics of materials detection
With numerical value Modeling Calculation method, the hazard prediction to casing can be completed in laboratory, the design and safety to oil/gas well are anti-
Shield provides guidance.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Unless otherwise instructed, means used in the examples are techniques known in the art means.
Embodiment 1:
A kind of hazard prediction method in oil/gas well approaches the working surface mining active process, operation specially below:
1, the coal working face that 200 meters away from discarded oil/gas well are chosen in coal mine collects the mining height of the working face, day promotes
The basic datas such as degree, Face Pressure Data.
2, according to the parameter for the coal working face being collected into, FLAC is used3DSoftware carries out numerical modeling, analyzes coal working face
Enter the wind the stress distribution situation of crossheading and air return way.By the peak that the lateral-supporting pressure of the coal working face is calculated
Value, coverage and the maximum shear stress.
It is 165MPa that numerical simulation, which obtains maximum principal stress suffered by oil gas casing, is located at unconsolidated formation and basement rock contact surface position
It sets.Calculated result is by FLAC3DSoftware Parameters of constitutive model calculates gained after carrying out assignment, setting constraint condition.It is different
Coal mine assignment it is different, the present embodiment assignment design parameter is shown in Table 1.Constitutive model is Ramberg-Osgood model.
Coal and rock physical and mechanical parameter after the reduction of table 1
This simulation is simulated just for a certain working face of mine, a certain specific oil/gas well technical data, is not considered
The influence of the changing factors such as different buried depth, caliber, wall thickness.The parameters such as buried depth, caliber, wall thickness are set, FLAC is used3DSoftware analog
Different conditions.
3, oil/gas well shell material in field with "nine squares" is collected, one section of steel pipe is taken, determines oil/gas well set by doing experiment in laboratory
The shear stress that tube damage can bear.
4, the maximum shear stress that can bear by the maximum shear stress and oil gas casing that compare coal working face,
To judge whether oil/gas well destroys.
If 5, oil gas casing has destroyed, toxic and harmful gas, the gas, original in oil/gas well can be caused accordingly
Oil, fuel gas, water etc. enter coal working face by crack, cause major safety risks.It is corresponding with regard to needing to take at this time
Technical safety measures ensures the safety in production of coal mine.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.It will be understood by those skilled in the art that straight from this patent disclosure and common sense
The substitution of export or some deformations or the prior art associated and the equivalent change or modification of feature are connect, can realize this
The function and effect of patent description, category the scope of this patent.
Claims (8)
1. a kind of hazard prediction method in oil/gas well approaches the working surface mining active process characterized by comprising
S1: the coal working face that discarded oil/gas well closes on is chosen in coal mine, collects the basic data of the working face；
S2: according to the parameter for the coal working face being collected into, numerical modeling, analysis coal working face air inlet crossheading and return air are carried out
The stress distribution situation of crossheading；
S3: taking the casing sample of oil/gas well in field with "nine squares", takes one section of steel pipe, does to test determining what oil/gas well Casing Failure can bear
Shear stress；
S4: the maximum shear stress that can bear by the maximum shear stress and oil gas casing that compare coal working face comes
Judge whether oil/gas well destroys.
2. hazard prediction method in oil/gas well approaches the working surface mining active process according to claim 1, which is characterized in that step
In rapid S1, choose in coal mine away from discarded oil/gas well 180-300 meters of coal working face.
3. hazard prediction method in oil/gas well approaches the working surface mining active process according to claim 1, which is characterized in that step
In rapid S1, the basic data includes the mining height of working face, day advance rate, Face Pressure Data.
4. hazard prediction method in oil/gas well approaches the working surface mining active process according to claim 1, which is characterized in that step
In rapid S2, FLAC is used3DSoftware carries out numerical modeling.
5. hazard prediction method in oil/gas well approaches the working surface mining active process according to claim 1, which is characterized in that step
Constitutive model is established in rapid S2, the constitutive model is Ramberg-Osgood model, by FLAC3DSoftware constitutive model ginseng
Number calculates after carrying out assignment, setting constraint condition.
6. hazard prediction method in oil/gas well approaches the working surface mining active process according to claim 1, which is characterized in that step
It is answered in rapid S2 by the way that peak value, coverage and the maximum shear of the lateral-supporting pressure of the coal working face is calculated
Power.
7. hazard prediction method in oil/gas well approaches the working surface mining active process according to claim 6, which is characterized in that institute
The maximum shear stress for stating coal working face is 165MPa, is located at unconsolidated formation and basement rock contact surface position.
8. hazard prediction method in described in any item discarded oil/gas well approaches the working surface mining active process according to claim 1~7,
It is characterized in that, if judging, oil gas casing has been destroyed, and takes technical safety measures to ensure the safety in production of coal mine.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111706299A (en) * | 2020-06-09 | 2020-09-25 | 天地科技股份有限公司 | Stoping construction method for waste oil and gas well passing coal face |
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