CN108240184A - Coal bed gas well reacting cycle pumping and washing process and device - Google Patents
Coal bed gas well reacting cycle pumping and washing process and device Download PDFInfo
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- CN108240184A CN108240184A CN201611228603.2A CN201611228603A CN108240184A CN 108240184 A CN108240184 A CN 108240184A CN 201611228603 A CN201611228603 A CN 201611228603A CN 108240184 A CN108240184 A CN 108240184A
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- 239000003245 coal Substances 0.000 title claims abstract description 97
- 238000005406 washing Methods 0.000 title claims abstract description 23
- 238000005086 pumping Methods 0.000 title claims abstract description 20
- 239000002817 coal dust Substances 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000011049 filling Methods 0.000 claims abstract description 22
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- 238000005192 partition Methods 0.000 claims description 17
- 238000011010 flushing procedure Methods 0.000 claims description 16
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- 230000000694 effects Effects 0.000 description 4
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- 230000003020 moisturizing effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
Abstract
The present invention relates to cbm development production fields, provide a kind of coal bed gas well reacting cycle pumping and washing process and device.The device includes immersible pump, hydrodynamic face Level monitor and high pressure fro water pump；This method obtains the terminal velocity of the coal dust sample by choosing the coal dust sample of coal bed gas well and carrying out settling test to it；As long as therefore terminal velocity that the water velocity in oil pipe is set above to coal dust sample sets magnitude, coal dust backwash in oil pipe can be come out, and it can ensure that there is certain backwash efficiency to coal dust, the water filling into rod tube annular space again simultaneously, and the fluctuation in the hydrodynamic face in rod tube annular space is made to be maintained in setting range, thus, can determine that one can either meet cleaning requirement, the speed of drawing water of bottom hole pressure surge will not be caused again, prevent coal dust from entering shaft bottom along the crack in coal seam, shaft bottom is caused to be blocked by coal dust, reservoir permeability reduces and coal dust precipitates holddown accident caused by pump barrel.
Description
Technical field
The present invention relates to cbm development production fields, specifically provide a kind of coal bed gas well reacting cycle pumping and washing process and dress
It puts, suitable for well type diameter, deviated directional drilling, horizontal well etc..
Background technology
Refering to what is shown in Fig. 3, the exploitation for coal bed gas, the prior art is that the oil pipe by one for drawing water is insinuated into coal mine gas
In layer, the bottom end of oil pipe connects an immersible pump, and immersible pump is embedded into underground water；A casing, casing are arranged with outside oil pipe
Space between oil pipe is referred to as rod tube annular space, and the page of underground water is located in the rod tube annular space, referred to as hydrodynamic face, hydrodynamic
It face can be as a reference of reaction groundwater pressure；When carrying out gas collecting, by oil pipe to extracardiac pumping, such underground water
Pressure can reduce, the gas in coal seam is since the reduction of hydraulic pressure will be infiltrated from coal seam and enter rod tube at this time
In annular space, thus coal bed gas is acquired from the top of rod tube annular space.
At the initial stage of acquisition, since underground water is abundant, there is no need to carry out moisturizing to it；And on the middle and later periods of acquisition, ground
The total amount of lower water tails off, and to ensure that hydrodynamic face has certain height, the water filling out of rod tube annular space is needed, to maintain gas production pressure
Power.
In above-mentioned gatherer process, due to being often mixed with pulverized coal particle in underground water, in this way through opening after a period of time
After adopting, a certain amount of pulverized coal particle can be accumulated in oil pipe and rod tube annular space, if do not cleared up it, it is easy to lead to card
The phenomenon that pump and rod tube annular space obstruction, the efficiency of gas production thus can be influenced, so to carry out the cleaning operation of coal bed gas well.
And well-flushing mode is broadly divided into direct flushing and reacting cycle well-flushing two ways, direct flushing is to oil
Water filling while by drawing water in rod tube annular space in pipe, water cycle in this way are clear by the coal dust gathered in rod tube annular space and oil pipe
Except out；And reacting cycle well-flushing is to extracardiac pumping by oil pipe, while passes through rod tube annulus water injection, circulation cleaning in this way
Except coal dust, and well-flushing can be carried out at the same time with exploitation；When the middle and later periods of coal-bed gas exploitation using reacting cycle well-flushing mode, due to this
When to ensure the height in hydrodynamic face, rod tube annular space has begun water filling, draws water and rod tube annular injection so to increase oil pipe at this time
The amount and jig frequency of water, to realize the purpose of well-flushing.
But coal bed gas, in the recovery process of gas well, due to grasping the production law of bad coal bed gas, regular opens
Closing well mouth vent valve and the amount for holding bad backwash bath, often cause bottom hole pressure surge, make coal dust along coal seam
Crack enters shaft bottom, and shaft bottom is caused to be blocked by coal dust, and reservoir permeability reduces and coal dust precipitates holddown accident caused by pump barrel.
Invention content
(1) technical problems to be solved
Can effectively the coal dust in oil pipe be washed out, and bottom pressure will not be caused the object of the present invention is to provide a kind of
A kind of coal bed gas well reacting cycle pumping and washing process and its device of fluctuation.
(2) technical solution
To achieve the above object, the present invention provides a kind of coal bed gas well reacting cycle pumping and washing process, this method includes following
Step：It chooses the coal dust sample of coal bed gas well and settling test is carried out to it, obtain the terminal velocity of the coal dust sample；Pass through
Immersible pump makes the water velocity in oil pipe higher than the sinking speed setting magnitude of coal dust sample from oil pipe to extracardiac pumping；To bar
Water filling in pipe ring sky, and the fluctuation in the hydrodynamic face in rod tube annular space is made to be maintained in setting range.
Preferably, pass through flushing pump water filling into rod tube annular space.
Preferably, the flushing pump by rod tube annular space annular opening side water filling.
Preferably, the terminal velocity of coal dust sample is calculated by the following formula,
Wherein, up0Terminal velocity m/s, u for pulverized coal particle are liquid velocity m/s,
A, b, c are orthogonal three axial lengths m, ρpFor coal dust density Kg/m3,
ρ is fluid density Kg/m3, μ is fluid viscosity Pa*s, and g is acceleration of gravity m/s2 (1)
Preferably, the water filling into rod tube annular space, and the fluctuation in the hydrodynamic face in rod tube annular space is made to be maintained at 5-10cm ranges
It is interior.
A kind of coal bed gas well reacting cycle well washing apparatus for coal bed gas well reacting cycle pumping and washing process as described above, the dress
It puts including immersible pump, hydrodynamic face Level monitor and high pressure fro water pump；The immersible pump is arranged in coal bed gas well, is used for
It extracts the water in coal bed gas well and is discharged by oil pipe, the flow that draws water of the immersible pump is adjustable；The dynamic liquid level monitoring arrangement is used
Dynamic liquid level height in monitoring rod pipe ring sky；The high pressure fro water pump is used for high according to the hydrodynamic face in the rod tube annular space
The water filling into rod tube annular space is spent, so that the dynamic liquid level height in rod tube annular space is maintained in setting range.
Preferably, which further includes mud chamber, and being internally provided with for the mud chamber is internally spatially extended by its bottom wall
Partition board；Filter device is equipped in the mud chamber and positioned at the side of the partition board, the filter device passes through return pipe
It is connected with oil pipe；The expansion chamber is connected in the opposite side space of the partition board by the high pressure fro water pump and rod tube annular space
It is logical；The expansion chamber is connected in the bottom in the space of the partition board both sides with blow-off pipe.
Preferably, the filter device includes the first strainer of tubular, second be disposed around except first strainer filter
Net and the filter cotton being located between first strainer and second strainer is filled out, the filter device is filtered by described first
The inner space of net is connected with the return pipe.
Preferably, the expansion chamber is equipped with the liquid level gauge for showing its liquid level, and the expansion chamber is additionally provided with moisturizing
Mouthful.
Preferably, the top of the expansion chamber is equipped with access hole.
(3) advantageous effect
A kind of coal bed gas well reacting cycle pumping and washing process and device provided by the invention.The device includes immersible pump, hydrodynamic face
Level monitor and high pressure fro water pump；This method is by choosing the coal dust sample of coal bed gas well and carrying out sedimentation examination to it
It tests, obtains the terminal velocity of the coal dust sample；As long as the water velocity in oil pipe is therefore set above the heavy of coal dust sample
End speed setting magnitude drops, you can the coal dust backwash in oil pipe to be come out, and can ensure there is certain backwash to imitate coal dust
Rate, while the water filling into rod tube annular space again, and the fluctuation in the hydrodynamic face in rod tube annular space is made to be maintained in setting range, as a result,
Can determine that one can either meet cleaning requirement and will not cause the speed of drawing water of bottom hole pressure surge, prevent coal dust edge
The crack for coal seam enters shaft bottom, and shaft bottom is caused to be blocked by coal dust, and reservoir permeability, which reduces, and coal dust precipitation pump barrel is caused blocks
Pump accident.
Description of the drawings
Fig. 1 is a kind of schematic diagram of coal bed gas well reacting cycle well washing apparatus of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the coal dust sample terminal velocity experimental rig of the embodiment of the present invention；
Fig. 3 is the schematic diagram of coal bed gas well exploitation in the prior art.
Reference numeral：
1st, expansion chamber；11st, access hole；2nd, return pipe；3rd, filter device；4th, partition board；5th, liquid level gauge；6th, high pressure is toward rehydration
Pump；7th, blow-off pipe.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but be not limited to the scope of the present invention.
A kind of coal bed gas well reacting cycle pumping and washing process provided by the invention, for the pulverized coal particle in oil pipe to be washed out
Come, to prevent oil pipe from blocking, realize the purpose smoothly acquired；This method includes the following steps：
It chooses the coal dust sample of coal bed gas well and settling test is carried out to it, obtain the terminal velocity of the coal dust sample.Ore deposit
Grain will be acted in static medium by two power：Downward gravity and upward resistance.Start sedimentation moment,
The sinking speed of ore particle be equal to zero, suffered by resistance also be equal to zero.Then ore particle starts accelerated sedimentation under the effect of gravity,
At this moment speed is cumulative, and resistance also increases therewith, and acceleration gradually decreases, and accelerates to be reduced to zero quickly after settling a period of time, this
When ore particle will be settled with constant speed, this speed is referred to as ore particle termin al velocity.
By immersible pump from oil pipe to extracardiac pumping, and the water velocity in oil pipe is made to be set higher than the sinking speed of coal dust sample
Quantitative values, since the terminal velocity of coal dust sample has been measured by experiment, therefore, the water velocity in oil pipe is only set as high
In the terminal velocity of coal dust sample, you can the coal dust backwash in oil pipe to be come out, and the speed of oily in-pipe flow is adjusted to height
Magnitude is set in the sinking speed of coal dust sample, it is ensured that there is certain backwash efficiency, while again to rod tube ring to coal dust
Water filling in sky, and the fluctuation in the hydrodynamic face in rod tube annular space is made to be maintained in setting range, can determine that as a result, one can
Enough meet cleaning requirement and the speed of drawing water of bottom hole pressure surge will not be caused, prevent coal dust from entering well along the crack in coal seam
Bottom causes shaft bottom to be blocked by coal dust, and reservoir permeability reduces and coal dust precipitates holddown accident caused by pump barrel.
Wherein, preferably by flushing pump water filling into rod tube annular space, since reacting cycle well-flushing and coal-bed gas exploitation are simultaneously
It carries out, so rod tube annular space continues to be vented outward, therefore passes through flushing pump water filling into rod tube annular space, it can be ensured that tool
Have enough water injection pressures, to ensure the water for setting flow being added into rod tube annular space, it is ensured that hydrodynamic face it is relative constant, should
The fluctuation in hydrodynamic face is preferably remained in the range of 5-10cm.
Further, the flushing pump is preferably by the side water filling of rod tube annular space annular opening, the side of such rod tube annular space
For water filling, and thus opposite side is independent of each other for being vented, can be further assured that water injection rate, and to the acquisition shadow of coal bed gas
Sound is smaller.
Wherein, the terminal velocity of coal dust sample can be obtained by following derivation：
1st, particle terminal velocity calculates
The calculating of pulverized coal particle termin al velocity is the essential condition that research carries pulverized coal particle flow velocity.Pulverized coal particle exists
By gravity and drag effect in pit shaft, Resistance Value is directly related with the sinking speed of pulverized coal particle.The sedimentation of coal dust mainly has
Free settling and in relate to sedimentation 2 kinds.Termin al velocity of the main studying coal powder in inactive liquid herein.To pulverized coal particle into
The power suffered in circular pipe of pulverized coal particle in solid-liquid two-phase flow is divided into pulverized coal particle intermolecular forces, stream by row force analysis
Relative motion is related between the unrelated power of one coal dust relative motion of body (including inertia force, gravity and difference force) and one coal dust of liquid
Power (including additional tension stress, Basset power, lift, Mag-nus power and Saffman power).Each power expression formula is as follows.
Basset power expression formulas are：
Wherein, u is liquid velocity m/s, upFor particle velocity m/s,
μ is fluid viscosity Pa*s, and ρ is fluid density Kg/m3, d is particle diameter m
(2)
Magnus power expression formulas are：
In formula,For right-handed helix system (3)
Saffrnan power, expression formula are：
In formula,Velocity gradient (4) for cross section
Gravity suffered by pulverized coal particle is respectively with buoyancy:
In formula, W and FfFor the gravity and buoyancy suffered by coal dust, N；ρpFor coal dust density, Kg/m3
G is acceleration of gravity, m/s2
Resistance suffered by pulverized coal particle is:
FZ=π CDρup/8
In formula, CDFor particle resistance coefficient (7)
Can obtain free-falling velocity of the spherical pulverized coal particle in stationary fluid by the equilibrium relation of power is:
Belong to transition region in coal bed gas well vertical bore fluid motion state, reynolds number Re is between 2-500.Therefore pulverized coal particle
Terminal velocity be:
The time that pulverized coal particle reaches terminal velocity degree is shorter, has almost reached terminal velocity degree once starting in particle,
I.e. it is believed that particle migration speed reaches terminal velocity with fluid velocity variation moment.Therefore convolution 8 can obtain particle and flow
Terminal velocity in body, that is, have:
up=u-up0
In formula, upFor the sinking speed m/s (10) of pulverized coal particle in a fluid
2nd, the analysis of experiments of pulverized coal particle sinking speed
2.1 experimental rig
Refering to what is shown in Fig. 3, the main experimental instrument and material of pulverized coal particle terminal velocity have settlement barrel 8, coal dust 9, slide calliper rule,
Grain size meter connects sand cup, tweezers, electronic scale, sieve, stopwatch and coal dust recover etc..Wherein settlement barrel be high 2m, internal diameter
The perspex transparent pipe of 120mm.Coal dust is density 1.4
The pulverized coal particle of g/cm3, diameter range 0.2-50.0mm.
Settlement barrel is clamped by iron clamp, to ensure that its is in vertical position.Settlement barrel is from top to bottom every there are one the 100mm
Scale, a total of 21 scales.Settlement barrel lower part is equipped with coal dust recover, and effect is to make the coal dust of sinking into people inside it.
Coal dust sample is that the mining stage samples from different places from three friendships.Pulverized coal particle terminal velocity experimental rig is as shown in Figure 1.
The coal dust of density 1.4g/cm3 is divided by 6 ranks of 5-200 mesh not etc. by electronic scale and sieve, is such as schemed
Shown in 2.The coal dust of certain mesh number is chosen, chosen using grain size meter and particle size values are obtained.
2.2 pulverized coal particle settling test interpretations of result
Select particle size range in the big pulverized coal particle and sand grains of 2 one 50mm and the duff powder particles of 5-20 mesh as experiment
The density of object, coal dust and sand grains is respectively 1.4 and 2.7g/cm3.
2.2.1 the terminal velocity experiment of sand grains
It is arbitrary to choose the sand grains that diameter range is 5-45mm.By the test of many times to different-grain diameter sand grains, sand grains is established
The relationship of diameter and terminal velocity, and test data is handled.
Sand fallout speed and the relationship of grain size are:
up0=5.843d0.4929 (11)
By formula (11) it is found that particle in theoretical formula compared with the Particle free terminal velocity formula (8) in inactive liquid
The index of diameter d is 0.5, and the index for testing fitting formula sand grains diameter d is 0.4929, it is seen that the finger of diameter d in formula
Number part is not much different.Sand grains density 2.7g/cm3 is substituted into theoretical formula (8) to obtain:
up0=7.0205d0.5 (12)
By the comparative analysis of formula (11) and formula (12) it is found that the coefficient part gap of formula is bigger, this be mainly because
Assumed condition for theoretical formula derivation is that sand particle size is spherical.
2.2.2 the terminal velocity experiment of big pulverized coal particle
In the case where not considering that grain shape influences, the arbitrary pulverized coal particle chosen in the range of diameter 7-33mm passes through
To the test of many times of different-grain diameter coal dust, the pulverized coal particle of different-grain diameter and the relationship of terminal velocity are established, through to test data
Processing.
Rough coal powder particles sinking speed and the relationship of grain size are:
up0=1.6099d0.4923 (13)
By formula (13) it is found that diameter d in formula compared with the Particle free terminal velocity theoretical formula (8) in inactive liquid
Exponential part difference nor very big.The index of particle diameter d is 0.5 in theoretical formula, tests coal dust in fitting formula
The index of grain diameter d is 0.4923.Coal dust density 1.4g/cm3 can be obtained for people's formula (8):
up0=3.4054d0.5 (14)
By the comparative analysis of formula (13) and formula (14) it is found that the coefficient difference of theory deduction formula and experiment fitting formula away from
It is very big.Main cause has the following:1. the shape of pulverized coal particle is not spherical；2. the density of pulverized coal particle is very small,
It can be found that particle is swung left and right in infall process, and the operation that is put to the test is affected；3. the mechanical property of coal dust is very poor,
Broken, its grain size can change during experiment, directly affect the accuracy of result of the test.
In the case where considering that grain shape influences, the approximate pulverized coal particle of selected shape, diameter is in 5-35mm ranges
It is interior.By the test of many times to different-grain diameter coal dust, the pulverized coal particle of different-grain diameter and the relationship of terminal velocity are established, through to examination
Data processing is tested, the relationship for obtaining coal dust sinking speed and grain size is:
up0=2.5078d0.5019 (15)
Comparative analysis formula (14) and formula (15) are it is found that the index of diameter d is relatively in formula.But fitting formula is
For number compared with the coefficient of theoretical formula, otherness is larger.Its main cause and the situation for not considering the influence of pulverized coal particle shape
It is identical.
2.2.3 duff powder particles terminal velocity is tested
Duff powder particles is taken to be divided into 2 groups；A diameter of 20 mesh of one group of pulverized coal particle and 30 mesh；Another group of 60 mesh of diameter and 80
Mesh.During experiment, record coal dust moves to time during settlement barrel scale, this group of test data is handled.
It is tested and found by the group, for coal dust in the setting in motion stage, test error is bigger.The reason is that thinner coal dust
All just start free settling later by applying certain external force, coal dust is initially fast first in a kind of state of floating on liquid level
It spends bigger.Meanwhile the time of pulverized coal particle arrival terminal velocity is very short, coincide with the calculated results.It is reached in coal dust
Before settlement barrel bottom, all start to move with uniform velocity.Later stage, fine breeze experiment terminal velocity fitting formula and reason are moved in coal dust
It is similar with bulky grain coal dust settling test by formula otherness.
2.3 pulverized coal particle sinking speed determine
Particle settling test is that the terminal velocity of particle is measured under the conditions of 3 kinds.This 3 kinds of conditions are respectively difference
The pulverized coal particle and sand grains of grain size do not consider particle shape factor and consider particle shape factor.Pass through pair of test data
Than analysis, some settlement laws of duff powder particles, rough coal powder particles and sand grains in hydrostatic have been obtained.
Density, shape and the mass concentration of particle are affected to terminal velocity, it is impossible to simply utilize spheric granules
Termin al velocity formula calculates, and must carry out form factor amendment to pulverized coal particle termin al velocity.The shape of pulverized coal particle
Shape coefficient can be corrected with coefficient that scholars propose is waited in section.Since pulverized coal particle mass concentration is relatively low, Ba Qiele can be used
Formula.Termin al velocity of the pulverized coal particle in inactive liquid can be changed to by experiment:
In formula, a, b and c are 3 orthogonal axial lengths, scratch size) the predetermined justice of InR1, unit m.
When reynolds number Re is 2-500, the terminal velocity of pulverized coal particle is:
Wherein, up0Terminal velocity m/s, u for pulverized coal particle are liquid velocity m/s,
A, b, c are orthogonal three axial lengths m, ρpFor coal dust density Kg/m3,
ρ is fluid density Kg/m3, μ is fluid viscosity Pa*s, and g is acceleration of gravity m/s2 (17)
The terminal velocity of coal dust sample is calculated by the following formula,
It is shown with reference to figure 1, the present invention also provides a kind of for coal bed gas well reacting cycle pumping and washing process as described above
Coal bed gas well reacting cycle well washing apparatus, the device include immersible pump, hydrodynamic face Level monitor and high pressure fro water pump 6；It is latent
Water pump is arranged in coal bed gas well, and for extracting the water in coal bed gas well and being discharged by oil pipe, the flow that draws water of immersible pump can
It adjusts, so as to which the terminal velocity of coal dust sample that is determined according to above-mentioned experiment adjusts a suitable pump discharge of drawing water, to protect
While card can come up coal dust extraction, borehole pressure is avoided to fluctuate, so as to avoid the coal dust in coal gas layer because of pressure
Power changes and falls, and thereby results in the phenomenon that blocking coal seam stomata；Dynamic liquid level monitoring arrangement is for dynamic in monitoring rod pipe ring sky
Liquid level, high pressure fro water pump 6 is used for according to the water filling into rod tube annular space of the dynamic liquid level height in rod tube annular space, so that rod tube
Dynamic liquid level height in annular space is maintained in setting range.
Wherein, the first strainer of filter device 3 including tubular, the second strainer for being disposed around except the first strainer and filling out is set
Filter cotton between the first strainer and the second strainer, filter device 3 are connected by the inner space of the first strainer with return pipe 2
It is logical.The device further includes mud chamber, and mud chamber is internally provided with by its bottom wall internally spatially extended partition board 4；In mud chamber
Interior and positioned at partition board 4 side is equipped with filter device 3, and filter device 3 is connected by return pipe 2 with oil pipe；Expansion chamber 1 in every
The opposite side space of plate 4 is connected by high pressure fro water pump 6 with rod tube annular space；Expansion chamber 1 is in the bottom in the space of 4 both sides of partition board
Connected with blow-off pipe 7.
By upper, it is first into the first strainer by the water of the carrier's coal dust come in extraction in return pipe 2, then successively
It is entered back into the part expansion chamber 1 of 4 side of partition board by the filtering of the first strainer, filter cotton and the second strainer, this
The coal dust of larger particles in Shi Huishui is filtered out by filter device 3, but there are still some relatively fine coal dusts.
Return water can just cross the top sides of partition board 4 after reaching a certain height in the part expansion chamber 1 positioned at 4 side of partition board
Edge, hence into the part coal dust in the part expansion chamber 1 to 4 opposite side of partition board, being mixed in return water in the process because of sedimentation
It is and further less；It crosses the return water after partition board 4 to store in expansion chamber 1 and continue to settle, eventually by high pressure fro water pump
6 are injected into rod tube annular space.
And the coal dust for being deposited in 1 bottom baffles of expansion chamber, 4 both sides is then discharged by blow-off pipe 7, is held so that expansion chamber 1 is kept to have
Continuous sedimentation capacity.
And certain water can be lost during blowdown, it is possible to set to show it in 1 side of expansion chamber
The liquid level gauge 5 of liquid level, and water supplement port can be also set at the top of expansion chamber 1, when the water level in discovery expansion chamber 1 is relatively low
When, can moisturizing be carried out by the water supplement port.
Preferably, the top of expansion chamber 1 is equipped with access hole 11, and the situation in expansion chamber 1 is detected by the access hole 11, with
The situation of obstruction pipeline is found in time, and so as to accomplish to dredge in time, which can share same with above-mentioned water supplement port
Opening.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these improve and replace
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of coal bed gas well reacting cycle pumping and washing process, which is characterized in that this method includes the following steps：Choose coal bed gas well
Coal dust sample simultaneously carries out settling test to it, obtains the terminal velocity of the coal dust sample；It is taken out outward by oil pipe by immersible pump
Water, and make the water velocity in oil pipe higher than the sinking speed setting magnitude of coal dust sample；The water filling into rod tube annular space, and make bar
The fluctuation in the hydrodynamic face in pipe ring sky is maintained in setting range.
2. coal bed gas well reacting cycle pumping and washing process according to claim 1, which is characterized in that by flushing pump to rod tube ring
Water filling in sky.
3. coal bed gas well reacting cycle pumping and washing process according to claim 2, which is characterized in that the flushing pump is by rod tube ring
The side water filling of empty annular opening.
4. coal bed gas well reacting cycle pumping and washing process according to claim 1, which is characterized in that the terminal velocity of coal dust sample
It is calculated by the following formula,
Wherein, up0Terminal velocity m/s, u for pulverized coal particle are liquid velocity m/s,
A, b, c are orthogonal three axial lengths m, ρpFor coal dust density Kg/m3,
ρ is fluid density Kg/m3, μ is fluid viscosity Pa*s, and g is acceleration of gravity m/s2。
5. coal bed gas well reacting cycle pumping and washing process according to claim 1, which is characterized in that the water filling into rod tube annular space,
The fluctuation in the hydrodynamic face in rod tube annular space is made to be maintained in the range of 5-10cm.
6. a kind of coal bed gas well being used for such as claim and 1 to 5 any one of them coal bed gas well reacting cycle pumping and washing process is anti-
Circulation well cleanup device, which is characterized in that including immersible pump, hydrodynamic face Level monitor and high pressure fro water pump；The diving
Pump is arranged in coal bed gas well, and for extracting the water in coal bed gas well and being discharged by oil pipe, the flow that draws water of the immersible pump can
It adjusts；The dynamic liquid level monitoring arrangement is for the dynamic liquid level height in monitoring rod pipe ring sky；The high pressure fro water pump is used for basis
Dynamic liquid level height water filling into rod tube annular space in the rod tube annular space, so that the dynamic liquid level height in rod tube annular space is maintained at and sets
Determine in range.
7. coal bed gas well reacting cycle well washing apparatus according to claim 6, which is characterized in that mud chamber is further included, it is described
Mud chamber is internally provided with by its bottom wall internally spatially extended partition board；In the mud chamber and positioned at the partition board
Side is equipped with filter device, and the filter device is connected by return pipe with oil pipe；The expansion chamber is another in the partition board
Side space is connected by the high pressure fro water pump with rod tube annular space；The expansion chamber is in the bottom in the space of the partition board both sides
Connected with blow-off pipe.
8. coal bed gas well reacting cycle well washing apparatus according to claim 7, which is characterized in that the filter device includes cylinder
It first strainer of shape, the second strainer being disposed around except first strainer and fills out and is located at first strainer and described second
Filter cotton between strainer, the filter device are connected by the inner space of first strainer with the return pipe.
9. coal bed gas well reacting cycle well washing apparatus according to claim 7, which is characterized in that the expansion chamber is equipped with and is used for
Show the liquid level gauge of its liquid level, the expansion chamber is additionally provided with water supplement port.
10. coal bed gas well reacting cycle well washing apparatus according to claim 7, which is characterized in that the top of the expansion chamber
Equipped with access hole.
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| CN201611228603.2A CN108240184A (en) | 2016-12-27 | 2016-12-27 | Coal bed gas well reacting cycle pumping and washing process and device |
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