CN110080725A - The coal seam pulsation optimal construction frequency determination methods of pressure break - Google Patents
The coal seam pulsation optimal construction frequency determination methods of pressure break Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 92
- 230000010349 pulsation Effects 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000002474 experimental method Methods 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 239000011148 porous material Substances 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 239000011435 rock Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- -1 methane Hydrocarbon Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035485 pulse pressure Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The present invention relates to the coal seam pulsation optimal construction frequency determination methods of pressure break, it includes: one, carries out expected pressure break coal seam scene coring, carries out coal petrography mechanics parameter test experiments, obtain basic mechanical parameter, the three-dimensional crustal stress data of coal petrography；Two, it establishes coal seam pulsation pressure break three-dimensional crustal stress and acts on lower finite element model；Three, coal seam pulsation pressure break disturbance stress field finite element model is established, calculates stress of coal seam field in certain ripple frequency Imitating, determines coal seam pulsation pressure break disturbance stress field distribution；Four, crack tip maximum tension stress is sought using tensile stress calculation formula；Five, step 3-tetra- is repeated, the crack tip maximum tension stress changing rule under different stress levels and different pulsation construction frequencies is obtained, determines optimal pulsation construction frequency.Using present invention determine that coal seam pulse the optimal construction frequency of pressure break, can be realized fracturing effect identical with conventional hydraulic pressure break under lower operation pressure, reduce operation pressure and advantageously reduce safe construction risk.
Description
Technical field:
Pulse pressure break stimulation technology the present invention relates to coal seam, and in particular to be that pressure break is optimal applies for coal seam pulsation
Work frequency determination methods.
Background technique:
Associated minerals resource of the coal bed gas as coal has sizable resource reserve in China, and coal bed gas is with methane
Hydrocarbon gas as main component is adsorbed on matrix of coal particle surface by suction-operated, is partially free in coal hole or molten
Solution belongs to Unconventional gas in coal seam water, is that cleaning, high-grade energy and chemical industry that recent decades emerge in the world are former
Material.When the concentration of coal bed gas reaches 5%-16%, meeting open fire will explode, this is the basic original of Gas Explosion Accidents in Coal Mines
Cause, if directly CBM Drainage is put into atmosphere, greenhouse effects are about 21 times of carbon dioxide, are had to ecological environment extremely strong
Destructiveness.If taking the lead in exploiting coal bed methane before coal mining, the probability that coal mine gas explodes will reduce 70%-85%.
As it can be seen that the development and utilization of coal bed gas has effects that achieve many things at one stroke, Safety of Coal Mine Production risk is both reduced, environment is protected,
The utilization rate of clean energy resource is improved again, while also bringing huge economic benefit.
From the point of view of China's coal-bed gas exploitation current situation, this factor of the low-permeable in coal seam greatly constrains coal bed gas
Yield, for the gas permeability for improving coal seam, hydraulic fracturing technology is usually applied in coal-bed gas exploitation.Currently, waterpower pressure
Split technology widely used, the effective exploitation of corresponding basic theory and technology to coal bed gas in oil and gas exploitation
With certain reference.
The new technology that coal seam pulsation pressure break is utilized as a cbm development, has compared with conventional hydraulic fracturing technique
More advantages.Pulsation pressure break can form increasingly complex fracture network inside coal seam, effectively increase pressure release area, reduce
Gas flow resistance realizes the purpose for improving Coalbed Methane Productivity.
Research finds that for a certain specific rock, there are intrinsic frequencies for itself, and the intrinsic frequency is only by rock itself group
Dividing influences with structure, reaches resonance state when the pulsating load that the external world applies is equal to this frequency, keeps rock interior damage fast
Speed aggravation, this frequency are optimal pulsation construction frequency.
But at present in terms of the optimal construction frequency studies of pressure break are pulsed in coal seam, technical staff chooses according to field experience, does not have
There are corresponding theoretical direction foundation or technical method, it is obvious in different coal block development pulsation pressure break aftereffect fruit difference in this way,
It needs to provide a kind of coal seam pulsation optimal construction frequency determination methods of pressure break, determines the pulsation optimal construction of pressure break of different blocks coal seam
Frequency values improve the reservoir reconstruction effect of pulsation pressure break.
Summary of the invention:
The object of the present invention is to provide the coal seam pulsation optimal construction frequency determination methods of pressure break, this coal seam pulsation pressure break is most
Excellent construction frequency determination methods are used to solve the problems, such as the Rational choice of coal seam pulsation fracturing process construction parameter.
The technical solution adopted by the present invention to solve the technical problems is: this coal seam pulsation optimal construction frequency of pressure break is true
Determine method:
Step 1: carrying out expected pressure break coal seam scene coring, carries out coal petrography mechanics parameter test experiments, obtain the base of coal petrography
This mechanics parameter, three-dimensional crustal stress data, basic mechanical parameter include elasticity modulus, Poisson's ratio, tensile strength；
Step 2: being established limited under coal seam pulsation pressure break three-dimensional crustal stress effect using comsol commercialization finite element software
Meta-model, includes pressure break well group casing programme information, the various hugger in coal seam and intrinsic fracture structural information in model, in a model
Default pulsation pressure break flaw size and fracture pattern, basic mechanical parameter, the three-dimensional crustal stress data, pore pressure data of coal petrography
Using experimental result in step 1 as foundation；
Step 3: coal seam pulsation pressure break disturbance stress field finite element model is established, with step 2 coal seam pulsation pressure break three-dimensional
It is initial value that crustal stress, which acts on lower finite element model calculated result, applies certain stress level fluctuation pressure to fractured well, one
Fixed ripple frequency Imitating calculates stress of coal seam field, determines coal seam pulsation pressure break disturbance stress field distribution；
Step 4: seeking crack tip maximum tension stress using tensile stress calculation formula, tensile stress calculation formula is as follows；
In formula: σxFor the direction x direct stress；σyFor the direction y direct stress；τxyFor shear stress；
The pulsation pressure break disturbance stress field finite element modelling result data of extraction step three, brings tensile stress calculation formula into, counts
Calculate the crack tip maximum tension stress determined under certain pulsating stress level and fixed ripple frequency.
Step 5: repeating Step 3: step 4, obtains the crack point under different stress levels and different pulsation construction frequencies
Maximum tension stress changing rule is held, in the case where guaranteeing the limiting pressure of operating tool string and equipment safety, to obtain target pressure break coal seam
Crack tip maximum stress value is target, determines optimal pulsation construction frequency, or according to site operation pressure requirements, answer specific
Under power is horizontal, to obtain target pressure break coal seam fracture tip maximum stress value as target, optimal pulsation construction frequency is determined.
The invention has the following advantages:
1, using present invention determine that coal seam pulse the optimal construction frequency of pressure break, coal seam can be made to pulse internal after pressing crack construction
Natural defect effective communication, more effectively increase reservoir reconstruction volume, enhance gas permeability of coal seam.
2, the coal seam pulsation optimal construction frequency of pressure break determined through the invention, effectively increases pulsation pressure break coal bed gas well
Production capacity brings huge economic benefit.
3, the coal seam pulsation optimal construction frequency of pressure break determined through the invention can obtain under identical operation pressure
The fracturing effect better than conventional hydraulic pressure break is taken, coal-bed gas exploitation efficiency is effectively improved.
4, using present invention determine that coal seam pulse the optimal construction frequency of pressure break, can be realized under lower operation pressure
Fracturing effect identical with conventional hydraulic pressure break reduces operation pressure and advantageously reduces safe construction risk.
5, the pulsation optimal construction frequency determination methods of pressure break in coal seam provided by the invention are according to pressing crack construction purpose to be carried out
Block coal rock core experiment of machanics result is designed, and mechanics parameter test can be carried out to the coal petrography of different blocks, by changing
Become mechanics parameter to obtain the optimal construction ripple frequency of different pressing crack construction purpose blocks, so that it is guaranteed that this method determines most
Excellent ripple frequency is suitable for different blocks.
Specific embodiment
The present invention is described further below:
This coal seam pulsation optimal construction frequency determination methods of pressure break are as follows:
Step 1: carrying out expected pressure break coal seam scene coring, mechanics parameter testing standard rock sample, including 50*100mm are prepared
With 50*25mm core, carrying out using the coal petrography core of acquisition includes uniaxial, triaxial compressions and Brazil's splitting and angle shearing etc.
Mechanics parameter test obtains the basic mechanicals such as coal petrography single shaft and triaxial shear strength, elasticity modulus, Poisson's ratio and tensile strength ginseng
Number carries out detecting earth stress experiment using full-scale rock sample machining experiment test specimen, obtains horizontally stress data, surveyed according to density
The data such as well calculate vertical crustal stress numerical value, and pore pressure data is calculated by log data.
Step 2: establishing under coal seam pulsation pressure break three-dimensional crustal stress effect has using the commercial finite element software such as comsol
Meta-model is limited, establishes the model, pressure break coal seam cleat system model and intrinsic fracture distributed model of fractured well in model simultaneously,
The default pulsed hydraulic fracturing flaw size of being formed and fracture pattern simultaneously, under coal seam pulsation pressure break three-dimensional crustal stress effect
Finite element model applies constraint condition；
Coal seam pulsation pressure break three-dimensional crustal stress acts on coal petrography basic mechanical parameter, Original strata stress data in lower finite element model
And pore pressure data etc. is to carry out grid to model after input parameter according to being inputted with experimental result in step 1
It divides, and localized region carries out mesh refinement processing；
Step 3: coal seam pulsation pressure break disturbance stress field finite element model is established, with step 2 coal seam pulsation pressure break three-dimensional
It is initial value that crustal stress, which acts on lower finite element model calculated result, applies fluctuation pressure to fractured well, and add in model boundary
Add perfect domination set to eliminate the influence of pulsating stress wave reflection, simulate and draws coal seam pulsation pressure break disturbance stress field distribution；
Step 4: seeking crack tip maximum tension stress using tensile stress calculation formula (formula (1))；
In formula: σxFor the direction x direct stress；σyFor the direction y direct stress；τxyFor shear stress；
The pulsation pressure break disturbance stress field finite element modelling result data of extraction step three, brings formula (1) into and calculates determining one
Determine the crack tip maximum tension stress under pulsating stress level and fixed ripple frequency.
Step 5: repeating that the crack tip under different stress levels and different pulsation construction frequencies can be obtained Step 3: four
Maximum tension stress changing rule.In the case where guaranteeing the limiting pressure of operating tool string and equipment safety, split with obtaining target pressure break coal seam
Seam tip maximum stress value is target, determines optimal pulsation construction frequency.It can also be according to site operation pressure requirements, specific
Under stress level, equally to obtain target pressure break coal seam fracture tip maximum stress value as target, optimal pulsation construction frequency is determined
Rate.
Determination of the present invention for coal seam pulsation pressure break process optimum pulsation construction frequency, to make natural inside coal seam lack
Effective communication is fallen into, the gas permeability in coal seam is enhanced, improves coal-bed gas exploitation efficiency, reduces construction safety risk.Both can reduce by
In ripple frequency design it is unreasonable and caused by economic loss, can also reduce blindly increase ripple frequency brought by construction peace
Full blast danger.
Claims (1)
- The optimal construction frequency determination methods of pressure break 1. a kind of coal seam is pulsed, it is characterised in that:Step 1: carrying out expected pressure break coal seam scene coring, carries out coal petrography mechanics parameter test experiments, obtain the fundamental force of coal petrography Learning parameter, three-dimensional crustal stress data and pore pressure data, basic mechanical parameter includes elasticity modulus, Poisson's ratio, tensile strength；Step 2: establishing coal seam pulsation pressure break three-dimensional crustal stress using comsol commercialization finite element software and acting on lower finite element mould Type includes pressure break well group casing programme information, the various hugger in coal seam and intrinsic fracture structural information in model, presets in a model It pulses pressure break flaw size and fracture pattern, the basic mechanical parameter of coal petrography, three-dimensional crustal stress data, pore pressure data are with step Experimental result is foundation in rapid one；Step 3: establishing coal seam pulsation pressure break disturbance stress field finite element model, answered with step 2 coal seam pulsation pressure break three-dimensional It is initial value that power, which acts on lower finite element model calculated result, applies certain stress level fluctuation pressure to fractured well, certain Ripple frequency Imitating calculates stress of coal seam field, determines coal seam pulsation pressure break disturbance stress field distribution；Step 4: seeking crack tip maximum tension stress using tensile stress calculation formula, tensile stress calculation formula is as follows；In formula: σxFor the direction x direct stress；σyFor the direction y direct stress；τxyFor shear stress；The pulsation pressure break disturbance stress field finite element modelling result data of extraction step three, brings tensile stress calculation formula into, calculates true Crack tip maximum tension stress under fixed certain pulsating stress level and fixed ripple frequency；Step 5: repeating Step 3: step 4, obtains different stress levels and the different crack tips pulsed under construction frequency most Big tensile stress changing rule, in the case where guaranteeing the limiting pressure of operating tool string and equipment safety, to obtain target pressure break coal seam fracture Tip maximum stress value is target, optimal pulsation construction frequency is determined, or according to site operation pressure requirements, in specific stress water Under flat, to obtain target pressure break coal seam fracture tip maximum stress value as target, optimal pulsation construction frequency is determined.
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Cited By (3)
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| CN111794727A (en) * | 2020-07-02 | 2020-10-20 | 中国石油大学(北京) | Pump injection frequency selection method and device for pulse circulation hydraulic fracturing |
| CN113356823A (en) * | 2021-06-29 | 2021-09-07 | 中国石油大学(北京) | Crack initiation method, device and system and controller |
| CN115628038A (en) * | 2022-10-31 | 2023-01-20 | 中国矿业大学 | Mine self-adjusting pulse fracturing method based on acoustic wave remote detection |
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| CN115628038A (en) * | 2022-10-31 | 2023-01-20 | 中国矿业大学 | Mine self-adjusting pulse fracturing method based on acoustic wave remote detection |
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