CN206114626U - Analogue means is used in drilling process coal reservoir pollution degree test - Google Patents
Analogue means is used in drilling process coal reservoir pollution degree test Download PDFInfo
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- CN206114626U CN206114626U CN201621127873.XU CN201621127873U CN206114626U CN 206114626 U CN206114626 U CN 206114626U CN 201621127873 U CN201621127873 U CN 201621127873U CN 206114626 U CN206114626 U CN 206114626U
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Abstract
The utility model discloses an analogue means is used in drilling process coal reservoir pollution degree test, including coal sample tank subassembly, coal seam analog component, drilling fluid injection subassembly, gas injection subassembly and control assembly, when using, handle and place including (1) coal sample in proper order, (2 ) coal sample tank connects, (3 ) pipeline connection, (4 )Loading axial stress and confined pressure, (5 )The test of original permeability, (6 )The reservoir pollution simulation tests, (7 )The drilling fluid is retrieved, (8 )Pollute back permeability test, (9 )The device arrangement. Analogue means, can be more real the pollution degree of drilling fluid under the simulation stress condition to, back permeability preceding to polluting is tested, offer reference for reservoir pollution ration sign among the drilling process, and drilling process pollution degree under the device can simulate out two kinds of drilling method of horizontal well and peupendicular hole simultaneously, under vertical stratification and the parallel bedding, it is strong to test the flexibility.
Description
Technical field
This utility model belongs to drilling well coal seam reservoirs pollution level technical field of measurement and test, particularly a kind of drilling process coal storage
Layer pollution level test analog.
Background technology
There is abundant subterranean coal gas stock number in China, if it is desired to which the coal bed gas resource for being stored at underground is developed
Come, needs carry out drilling well on ground.
During drilling well, in order to prevent drill bit overheated and cutting carring, drilling fluid is needed.Property of drilling fluid is different, causes drilling well
Process is different to coal seam reservoirs pollution level.Meanwhile, coal seam reservoirs pollution level is also by the pressure of the drill, rotating speed, crustal stress, Coal Pore Structure etc.
Affect.The with serious pollution well of coal seam reservoirs, on the one hand, may be too high because of later stage pressure break, and cause pressure break to fail；On the other hand, shadow
The drainage and step-down aerogenesis of later stage coal bed gas well is rung, whole project failure is even resulted in.
In order to control pollution of the drilling fluid to coal seam reservoirs, China coal bed gas worker carries out property of drilling fluid suction in laboratory
The performance tests such as attached, resistance, to reduce its nocuity to coal seam reservoirs.By liquid-tight in coal seam section reduction rotating speed, the pressure of the drill, drilling well
The methods such as degree are reducing injury of the drilling process to coal seam reservoirs.But different coal seam reservoirs attributes, differently stress condition, different well type
Under to coal seam reservoirs pollution depth be how manyHow is pollution levelPermeability after pollution is how manyIt is current for these problems
Clear and definite answer can not be still given.The more experiences based on workmen of setting of live drilling parameter, coal seam reservoirs attribute, geology
The multiformity of condition etc. determines that only carrying out drilling well by field experience may bring serious pollution to coal seam reservoirs.
Therefore in the urgent need to developing a kind of device, different drilling fluids, different coal seam reservoirs attributes, different geology bars can be simulated
Part, different well type, to the pollution level of coal seam reservoirs in drilling process, so as to for drilling parameter optimization, premium drilling fluid formula
Develop and foundation is provided.
Utility model content
This utility model aims to provide a kind of drilling process coal that can be with Validity Test drilling fluid to coal seam reservoirs pollution level
Reservoir pollution Tachistoscope analog.
To solve above-mentioned technical problem, this utility model provides following technical scheme：A kind of drilling process coal seam reservoirs
Pollution level test analog, including coal sample canister assembly, coal seam simulated assembly, drilling fluid fill assembly, gas injection component and
Control assembly；
Coal sample canister assembly includes static housing and at least one coal sample tank, and coal sample tank slides inside static housing, respectively
Individual coal sample tank is sequentially distributed along the short transverse of static housing；
The tubular that coal sample tank is open in top and bottom, the top of coal sample tank is provided with upper sleeve gasket cylinder, coal sample tank
Bottom is provided with lower sleeve gasket cylinder；
Through hole is provided through on upper sleeve gasket cylinder and lower sleeve gasket cylinder, is respectively provided with the through hole of each lower sleeve gasket cylinder
There are outlet electronic pressure gauge and outlet electronic flowmeter；
Connected by elastic ring packing ring between upper sleeve gasket cylinder and lower sleeve gasket cylinder between adjacent coal sample tank, elastic ring
The cavity connected with through hole is provided with shape packing ring；
The inner bottom surface of static housing is provided with base, and the coal sample tank positioned at bottom is on base；Gas is provided with base
Sap cavity, gas-liquid chamber is connected with the coal sample tank positioned at bottom by the through hole on lower sleeve gasket cylinder；
Coal seam simulated assembly includes axial pressure component and confined pressure charging assembly；
Axial pressure component includes axial pressure machine, pressure transducer and the axle pressure pressure rod being vertically arranged, axle pressure pressurization
The end of bar is fixed with pressure gasket, and pressure gasket is fitted with the upper sleeve gasket cylinder on the coal sample tank of the top；Pressure is passed
Sensor is arranged on the lower surface of upper sleeve gasket cylinder；
Confined pressure charging assembly includes oil hydraulic cylinder, oil tank and oil pump, and two oil hydraulic cylinders are arranged in each coal sample tank；
The oil-in that oil hydraulic cylinder is provided with pressure gauge and connects with oil hydraulic cylinder inside, the oil inside pressure gauge detection oil hydraulic cylinder
Pressure；Slide in oil hydraulic cylinder and be provided with pressurizing piston, the end of pressurizing piston is provided with confined pressure pressure rod, and the cross section of confined pressure pressure rod is in
Arc；
Two confined pressure pressure rods in same coal sample tank are oppositely arranged；
Oil tank connects the entrance of oil pressure pump, and the outlet of oil pressure pump connects the oil-in of oil hydraulic cylinder by oil line pipe；
Drilling fluid fill assembly includes drilling well liquid case, vibrating motor and vibration chamber, and vibrating arm is provided with vibration chamber, vibrates
Bar is connected with vibrating motor；
Liquid booster pump is connected with by the first connecting pipe in the outlet of drilling well liquid case；
The outlet of liquid booster pump is provided with drilling fluid electronics pressure by the second connecting pipe vibration chamber, the second connecting pipe
Power meter and drilling fluid electronic flowmeter；
The liquid outlet of vibration chamber connects the through hole on upper sleeve gasket cylinder by drilling fluid conduit, and drilling fluid conduit is provided with brill
Well liquid electronic pressure gauge, drilling fluid electronic flowmeter and electronic valve；
Gas injection component includes gas tank and the high-pressure pump being connected on gas tank, and the gas outlet of high-pressure pump passes through gas path pipe
Through hole on connection upper sleeve gasket cylinder, gas path pipe is provided with electronic pressure gauge and electronic flowmeter；
Control assembly includes processing unit, pressure transducer, drilling fluid electronic pressure gauge, drilling fluid electronic flowmeter, electricity
The signal output part of sub- piezometer, electronic flowmeter, outlet electronic pressure gauge and outlet electronic flowmeter is all connected with processing unit
Signal input part；Electronic valve drive circuit, electronic valve drive circuit control are connected with the signal output part of processing unit
The work of electronic valve processed.
Also include the sampling assemble equal with coal sample tank quantity, sampling assemble includes probe tube and taking on probe tube
Sample valve, probe tube one end connects with coal sample tank, and graduated cylinder is connected with the other end.
Slide assemblies are provided between adjacent coal sample tank, slide assemblies include sliding bar and the sliding groove being equipped with, sliding
On the lateral wall of coal sample tank above, sliding groove is on the lateral wall of underlying coal sample tank for lever.
Static housing inwall is provided with dovetail groove, coordinates dovetail groove to be provided with clamp on the lateral wall of coal sample tank, and clamp is slided
It is dynamic to be arranged in dovetail groove.
Coal sample tank is provided with the connecting hole being vertically arranged, and steady pin is equipped with connecting hole.
Diverter is connected with oil pressure pump, each oil-out of diverter is connected respectively with the oil-in on oil hydraulic cylinder, point
Oil circuit electromagnetic valve is provided with each oil-out of stream device, coordinates oil circuit electromagnetic valve to be provided with solenoid-driven electricity in control assembly
Road, driving circuit for electromagnetic valve connects the signal output part of processing unit, the work of driving circuit for electromagnetic valve oil circuit control electromagnetic valve.
Also include gas recycling can and liquid recovery tank, gas recycling can and liquid recovery tank with bottom
Through hole connection on seal sleeve；Gas recycling can and liquid recovery tank with through hole with valvular pipeline by being connected.
By above technical scheme, the beneficial effects of the utility model are：1st, the device is by arranging coal seam simulated assembly
Drilling fluid contamination depth under stress condition can be more really simulated, and is tested polluting forward and backward permeability, be drilling well
Reservoir pollution quantitatively characterizing is offered reference in journey；The coal sample tank of setting allows device to simulate two kinds of horizontal well and peupendicular hole
Drilling process pollution level under drilling mode, under vertical stratification and parallel bedding, test motility is strong.2nd, the sampling assemble for arranging
Facilitate and analysis is sampled to drilling fluid.3rd, the slide assemblies and dovetail groove for arranging facilitate coal sample tank in static housing
Connection.4th, the gas recycling can and liquid recovery tank for arranging facilitates the recovery of gas and drilling fluid.
Description of the drawings
Fig. 1 is analog structural representation described in the utility model；
Fig. 2 is confined pressure charging assembly structural representation；
Fig. 3 is upper sleeve gasket cylinder and lower sleeve gasket barrel structure schematic diagram；
Fig. 4 is control assembly theory diagram.
Specific embodiment
A kind of drilling process coal seam reservoirs pollution level test analog and method, as shown in Figure 1, Figure 2 and Figure 3, bag
Include coal sample canister assembly, coal seam simulated assembly, drilling fluid fill assembly, gas injection component, sampling assemble and control assembly.
Coal sample canister assembly includes static housing 27, and dovetail groove 272, dovetail groove are provided with the inwall of static housing 27
272 are arranged along the short transverse of static housing 27, and the structure of dovetail groove 272 is ripe prior art.
At least one coal sample tank 25 is provided with static housing 27, the quantity of coal sample tank 25 is 3 in the present embodiment.It is fixed
The inner bottom surface of casing is provided with base 30, and the coal sample tank 25 positioned at bottom is on base 30.Gas-liquid chamber is provided with base 30,
Gas-liquid chamber be connected positioned at the coal sample tank of bottom, so as to the gas that oozes out from coal sample in the coal sample tank of bottom or liquid
During gas-liquid chamber can be entered into.The mode of communicating of the wherein coal sample tank of gas-liquid chamber and bottom is：By bottom coal sample tank
Through hole connection on the lower sleeve gasket cylinder of lower end.
Each coal sample tank 25 is sequentially distributed along the short transverse of static housing 27, and the quantity of coal sample tank 25 is in the present embodiment
3.Wherein, coal sample tank 25 slides inside static housing 27, in order to be defined to the slip of coal sample tank 25, in coal sample
Dovetail groove is coordinated to be provided with clamp 277 on the lateral wall of tank 25, clamp 277 is slideably positioned in dovetail groove 272, the dovetail of setting
Groove 272 allows the in the vertical direction of coal sample tank 25 to slide, but can not move left and right in the horizontal direction, it is ensured that coal sample
Stability in the course of work of tank 25.
To realize the connection between coal sample tank, the connecting hole being vertically arranged is provided with coal sample tank, is equipped with connecting hole solid
Rationed marketing 276, is linked together in each coal sample tank by steady pin 276, while coal sample tank can be slided relative to steady pin 276
It is dynamic.
Stability in order to be further ensured that the sliding process of coal sample tank 25, between adjacent coal sample tank 25 Slide Group is provided with
Part, slide assemblies include sliding bar 28 and the sliding groove 29 being equipped with, and sliding bar 28 is located at the outer of coal sample tank above
On the wall of side, sliding groove 29 is on the lateral wall of underlying coal sample tank 25.Wherein, sliding bar 28 is slideably positioned in sliding groove
In 29, so as to the slip further to coal sample tank is defined.
In the present embodiment, the structure of coal sample tank is：The tubular that coal sample tank 25 is open in top and bottom；Coal sample tank 25
Top is provided with upper sleeve gasket cylinder 153, and the bottom of coal sample tank is provided with lower sleeve gasket cylinder 151, by upper sleeve gasket cylinder 153 with
Seal sleeve 151 realizes the sealing of coal sample tank 25.
Be provided through through hole 154 on upper sleeve gasket cylinder 153 and lower sleeve gasket cylinder 151, each lower sleeve gasket cylinder it is logical
Outlet electronic pressure gauge and outlet electronic flowmeter are provided with hole, outlet electronic pressure gauge and outlet electronic flowmeter do not have
Have and shown in figure, the liquid or gas of lower sleeve gasket cylinder can be flowed through by outlet electronic pressure gauge and outlet electronic flowmeter
The parameter of body is acquired.
Pass through elastic ring between upper sleeve gasket cylinder 153 and lower sleeve gasket cylinder 151 between two adjacent coal sample tanks 25
Packing ring 152 connects, and the cavity connected with through hole 154 is provided with elastic ring packing ring 152, by cavity and the liquid of through hole 154
Or gas can flow between two adjacent coal sample tanks 25.
In order to coordinate the movement of elastic ring packing ring 152, connect between the through hole of upper sleeve gasket cylinder and lower sleeve gasket cylinder
There is flexible pipe 156, the loading of axial stress can be coordinated by flexible pipe 156.
Coal seam simulated assembly includes axial pressure component and confined pressure charging assembly, and it mainly provides coal sample in axial and circumferential
On stress, simulate coal sample real stress state in reservoir.
Axial pressure component includes axial pressure machine 13, pressure transducer 159 and the axle pressure pressure rod being vertically arranged；Axle pressure
The end of pressure rod is fixed with pressure gasket 14, pressure gasket 14 and the upper sleeve gasket cylinder 153 being located on the coal sample tank of the top
Laminating；Pressure transducer 159 is arranged on the lower surface of upper sleeve gasket cylinder 153, can be intuitively so as to pass through pressure transducer
Collect when axial stress is loaded, the size of the pressure that coal sample is subject to.
Wherein axial pressure machine 13 is ripe prior art, and when implementing piston, the piston of piston can be selected
Bar is connected with axle pressure pressure rod, so as to pass through the pressure pressure rod movement of piston driving axle, realizes applying the purpose of axle pressure to coal sample.
Confined pressure charging assembly includes being provided with oil-in and manometric oil hydraulic cylinder 273, and oil-in is connected with oil hydraulic cylinder inside,
So that oil body can be entered in oil hydraulic cylinder；Pressure gauge can be measured to the oil pressure in oil hydraulic cylinder.
Wherein, two oil hydraulic cylinders are set in each coal sample tank, and sliding in each oil hydraulic cylinder 273 is provided with pressurizing piston 274,
The end of pressurizing piston 274 is provided with confined pressure pressure rod 275, and two confined pressure pressure rods 275 in same coal sample tank are oppositely arranged；
Meanwhile, the cross section of confined pressure pressure rod 275 is curved, such that it is able to preferably contact with coal sample, it is ensured that circumferential stress is loaded
It is more uniform, the simulation to environment is truer.
Oil tank 22 and oil pressure pump 21 are connected with the oil-in of oil hydraulic cylinder 273, oil tank 22 connects the entrance of oil pressure pump 21,
The outlet of oil pressure pump 21 connects the oil-in of oil hydraulic cylinder 273 by oil line pipe, by oil pressure pump so that hydraulic oil enters from oil tank
Enter in oil hydraulic cylinder.
In order to apply circumferential stress simultaneously to the coal sample in each coal sample tank, shunting is connected with the outlet of oil pressure pump 21
Device 24, the oil-in of diverter connects the outlet of oil pressure pump 21, each oil-out of diverter 24 respectively with oil hydraulic cylinder on enter
Hydraulic fluid port connects；The oil-out of diverter 24 is at least equal with the quantity of coal sample tank.
Oil circuit electromagnetic valve 23 is provided with each oil-out of diverter 24, oil circuit electromagnetic valve 23 can control hydraulic oil
In whether flowing into oil hydraulic cylinder 273.From oil circuit electromagnetic valve 23, it is electromagnetic valve, is easy to control.
Drilling fluid fill assembly includes drilling well liquid case 2, vibrating motor 6 and vibration chamber 7, and vibrating arm is provided with vibration chamber,
Vibrating arm is indicated without in figure.Vibrating arm is connected with vibrating motor 6, so as to drive drilling well in vibration chamber by vibrating arm
The vibration of liquid, and then simulate drilling fluid in drilling process and really take slag and return row pattern state, prevent coal dust from precipitating.
Liquid booster pump 3 is connected with by the first connecting pipe in the outlet of drilling well liquid case 2, wherein, the first connecting pipe
Control valve 4 is provided with, being turned on and off for connecting pipe can be controlled by control valve 4, and then realize the control of drilling fluid
System.
The outlet of liquid booster pump 3 causes drilling well liquid case by the second connecting pipe vibration chamber 7 by liquid booster pump 3
In drilling fluid can enter in vibration chamber 7.Wherein the second connecting pipe is provided with drilling fluid electronic pressure gauge 5 and drilling fluid
Electronic flowmeter, drilling fluid electronic flowmeter shows without in figure.By drilling fluid electronic pressure gauge, drilling fluid electronic flow
Meter can intuitively draw the flow and pressure of the drilling fluid entered in coal sample tank.
The liquid outlet of vibration chamber 7 connects the through hole on upper sleeve gasket cylinder by drilling fluid conduit, so that drilling fluid can
In to enter into coal sample tank.Electronic valve 8 is provided with drilling fluid conduit, electronic valve 8 can control opening for drilling fluid conduit
Open or close.
Gas injection component includes gas tank 1 and the high-pressure pump 10 being connected on gas tank, controls for convenience, in gas tank 1 and height
Gas circuit valve 11 is provided between compression pump 10, the gas flow entered in high-pressure pump 10 by the control of gas circuit valve 11.High pressure
The gas outlet of air pump 10 connects the through hole on upper sleeve gasket cylinder by gas path pipe, and gas path pipe is provided with the He of electronic pressure gauge 12
Electronic flowmeter 9, by electronic pressure gauge and the control of circuit effusion meter by the gas parameter on gas path pipe.
Sampling assemble includes probe tube 26 and the sample cock on probe tube 26, and probe tube one end connects with coal sample tank
It is logical；Graduated cylinder 16 is connected with the probe tube other end.The quantity of sampling assemble is equal with the quantity of coal sample tank, on each coal sample tank
One sampling assemble is set.When in use, when sampling to drilling fluid, sample cock is opened, drilling fluid enters from probe tube 26
Enter in graduated cylinder 16, consequently facilitating in the future to the analysis of drilling fluid composition.
Control assembly includes processing unit, outlet electronic pressure gauge, outlet electronic flowmeter, pressure transducer, electronics pressure
The signal output part of power meter and electronic flowmeter connects the signal input part of processing unit；Connect on the signal output part of processing unit
Electronic valve drive circuit and oil circuit driving circuit for electromagnetic valve are connected to, electronic valve drive circuit controls the work of electronic valve；
The work of oil circuit driving circuit for electromagnetic valve oil circuit control electromagnetic valve.Electronic valve and oil circuit electromagnetic valve are electromagnetic valve, electronic valve
Gate drive circuit and oil circuit driving circuit for electromagnetic valve are ripe prior art.Processing unit can be from single-chip microcomputer or calculating
Machine, can be analyzed by processing unit to the signal being input into.
Outlet electronic pressure gauge, outlet electronic flowmeter, pressure transducer, electronic pressure gauge and electronic flowmeter will be gathered
To information transfer to processing unit, processing unit draws the ginseng of the gas or liquid entered in coal sample tank according to prior art
Number.
Processing unit outputs signals to electronic valve drive circuit and oil circuit driving circuit for electromagnetic valve, control electronic valve and
The work of oil circuit electromagnetic valve.
In order to realize the recovery of drilling fluid and gas, gas recycling can 18 and liquid recovery tank 19 are also included in this device,
Gas recycling can 18 and liquid recovery tank 19 connect with the through hole on the lower sleeve gasket cylinder 151 on the coal sample tank 25 of bottom
Connect.When connection, gas recycling can 18 and liquid recovery tank 19 by being connected with through hole with valvular pipeline, wherein valve
Door and pipeline are indicated without in figure.When use, opening drilling fluid or gas after valve can be entered into by pipeline
On the other hand liquid recovery tank or gas recycling can, on the one hand ensure that gas or the recovery of drilling fluid are used, it is to avoid gas
The pollution problem that the random discharge of body and drilling fluid is caused, it is easy to use.
The drilling process coal seam reservoirs pollution level test analogy method implemented by apparatus above, successively including following step
Suddenly：
（1）Coal sample process and placement；
First, the coal sample with coal sample tank mating shapes is chosen, the wherein length of coal sample is more than the length of coal sample tank, so as to
So that the top and bottom of coal sample are located in upper sleeve gasket cylinder and lower sleeve gasket cylinder respectively, and then realize the survey to axial stress
Examination.
Then, drill in coal sample, the equal diameters of the through hole on the diameter for being drilled and lower sleeve gasket cylinder；Drilled
Length is 1/6 ~ 1/4, preferably the 1/5 of coal sample length.The coal sample of different drilling directions can simulate different infiltration directions, put down
The coal sample drilled through in row layer can simulate the infiltration of peupendicular hole or horizontal well in parallel direction, and the coal sample that perpendicular layers are drilled through can be with
In the infiltration in perpendicular layers direction during simulation water horizontal well drilling well, comparison is used flexible.
Finally, coal sample is positioned in coal sample tank, it is ensured that the one end drilled in coal sample is placed upward, by upper sleeve gasket cylinder
With the top and bottom that lower sleeve gasket cylinder is respectively arranged at coal sample tank.
By drilling in coal sample, the drilling operation in coal seam can be simulated, improve the verity of test result.
（2）Coal sample tank connects；
First, by each coal sample tank by slide assemblies and fixed pin connection；Then, the coal sample tank for connecting is positioned over
In static housing, and the clamp on each coal sample tank is equipped with dovetail groove, coal sample tank can be in fixed case after connection
Vertically move in body, but in the horizontal direction coal sample tank cannot be moved in static housing, so as to facilitate axial direction
The loading of stress.
（3）Pipeline connects；
Oil pressure pump is connected with oil hydraulic cylinder；
Gas tank is connected with high-pressure pump, by the through hole on the gas outlet connection upper sleeve gasket cylinder of high-pressure pump；
Gas recycling can and liquid recovery tank connect with the through hole on the lower sleeve gasket cylinder on the coal sample tank of bottom
Connect；
Probe tube one end connects coal sample tank, and the other end and graduated cylinder connect；
The signal of outlet electronic pressure gauge, outlet electronic flowmeter, pressure transducer, electronic pressure gauge and electronic flowmeter
Outfan is connected with the signal input part of processing unit；Electronic valve drive circuit and oil circuit driving circuit for electromagnetic valve are all connected with
The signal output part of processing unit.
（4）Loading axial stress and confined pressure；
First, oil tank and oil pressure pump are opened, confined pressure is applied to coal sample, number pressure is read by the pressure gauge on oil hydraulic cylinder
According to judging the size of confined pressure according to the pressure data；
Then, axial pressure machine is opened, axial pressure machine drives axial pressure bar to move down, coal sample is applied axially should
Power, pressure transducer gathers the size of axial stress, and the axial stress for collecting is transferred to into processing unit.
（5）Original permeability is tested
First, processing unit outputs signals to electronic valve drive circuit, so as to close on drilling fluid fill assembly
Electronic valve, drilling fluid fill assembly is isolated with coal sample tank.
Then, gas tank and high-pressure pump are opened, gas are injected in coal sample tank, electronic pressure gauge gathers gas injection pressure,
Electronic flowmeter gathers gas injection rate, while the outlet electronic pressure gauge and outlet electronic flow in the through hole of each lower sleeve gasket cylinder
Meter gathers respectively the gas pressure and gas flow from coal sample tank out；Electronic pressure gauge, electronic flowmeter, each outlet
, by the data transfer for collecting to processing unit, processing unit is according to gas injection for electronic pressure gauge and each outlet electronic flowmeter
The value of pressure and each outlet electronic pressure gauge, and the value of electronic flowmeter and each outlet electronic flowmeter calculates each coal
The infiltration capacity of coal sample in sample tank, show that the permeability of coal sample is ripe prior art according to gas injection pressure and gas flow.
（6）Reservoir pollution simulation test
First, high-pressure pump is closed, the valve opened on the pipeline being connected with gas recycling can is deflated, and gas is returned
Closed cans is reclaimed to the gas released, the valve that deflation is closed on the pipeline being connected with gas recycling can after terminating；
Then, liquid booster pump and vibrating motor are opened so that the coal sample that drilling fluid is entered in coal sample tank is permeated；
The pressure and flow of drilling fluid electronic pressure gauge on drilling fluid conduit and drilling fluid electronic flowmeter moment collection drilling fluid
Change；Simultaneously the outlet electronic pressure gauge and outlet electronic flowmeter in the through hole of each lower sleeve gasket cylinder is gathered respectively from coal sample
The pressure of the drilling fluid in tank out and the change of flow；Drilling fluid electronic pressure gauge, drilling fluid electronic flowmeter, go out pneumoelectric
, by the data transfer for collecting to processing unit, processing unit show out that drilling fluid exists for sub- piezometer and outlet electronic flowmeter
Seepage velocity and infiltration capacity in coal sample.According to the pressure, flow that enter into the drilling fluid in coal sample tank and from coal sample tank
The pressure and flow of drilling fluid out show that the seepage velocity and infiltration capacity of coal sample is ripe prior art.
During permeating to coal sample in drilling fluid enters into coal sample tank, the fortune of liquid booster pump and vibrating motor
Line parameter keeps invariable, so as to the pressure for ensureing the drilling fluid from liquid booster pump and vibration chamber out is constant, and then
Further improve the accuracy of test result, it is to avoid the pressure variations influence test knot of the drilling fluid from liquid booster pump out
Really.
Finally, closing liquid booster pump, opens sample cock, and the drilling fluid that each coal sample tank is penetrated is sampled；
（7）Drilling fluid reclamation, opens the valve on the connected pipeline of liquid recovery tank, and remaining drilling fluid enters in coal sample tank
Enter and reclaimed in liquid recovery tank.
（8）Permeability test after pollution
Repeat step 5）, it is compared according to the permeability and original permeability after pollution and just can draw drilling fluid
Pollution level to coal sample, difference and the original permeability of permeability can be divided by and draw pollution after original permeability and pollution
Degree, the prior art for being derived as maturation of pollution level.
（9）Device is arranged
Test terminates, and opens the valve on the pipeline being connected with gas recycling can, and the gas in coal sample tank enters into gas
Recycling can；Axial pressure component and confined pressure charging assembly are uninstalled successively, coal sample tank is taken out from static housing, reclaim coal sample.
Analog described in the utility model, can more really simulate the pollution level of drilling fluid under stress condition,
And test polluting forward and backward permeability, it is that reservoir pollution quantitatively characterizing is offered reference in drilling process, while the device energy
Simulate under two kinds of drilling modes of horizontal well and peupendicular hole, drilling process pollution level under vertical stratification and parallel bedding, test
Motility is strong.
Claims (7)
1. a kind of drilling process coal seam reservoirs pollution level test analog, it is characterised in that：Including coal sample canister assembly, coal seam
Simulated assembly, drilling fluid fill assembly, gas injection component and control assembly；
Coal sample canister assembly includes static housing and at least one coal sample tank, and coal sample tank slides inside static housing, each coal
Sample tank is sequentially distributed along the short transverse of static housing；
The tubular that coal sample tank is open in top and bottom, the top of coal sample tank is provided with upper sleeve gasket cylinder, the bottom of coal sample tank
It is provided with lower sleeve gasket cylinder；
Through hole is provided through on upper sleeve gasket cylinder and lower sleeve gasket cylinder, is provided with out in the through hole of each lower sleeve gasket cylinder
Gas electronic pressure gauge and outlet electronic flowmeter；
Connected by elastic ring packing ring between upper sleeve gasket cylinder and lower sleeve gasket cylinder between adjacent coal sample tank, elastic ring pad
The cavity connected with through hole is provided with circle；
The inner bottom surface of static housing is provided with base, and the coal sample tank positioned at bottom is on base；Gas-liquid chamber is provided with base,
Gas-liquid chamber is connected with the coal sample tank positioned at bottom by the through hole on lower sleeve gasket cylinder；
Coal seam simulated assembly includes axial pressure component and confined pressure charging assembly；
Axial pressure component includes axial pressure machine, pressure transducer and the axle pressure pressure rod being vertically arranged, axle pressure pressure rod
End is fixed with pressure gasket, and pressure gasket is fitted with the upper sleeve gasket cylinder on the coal sample tank of the top；Pressure transducer
It is arranged on the lower surface of upper sleeve gasket cylinder；
Confined pressure charging assembly includes oil hydraulic cylinder, oil tank and oil pump, and two oil hydraulic cylinders are arranged in each coal sample tank；
The oil-in that oil hydraulic cylinder is provided with pressure gauge and connects with oil hydraulic cylinder inside, the oil pressure inside pressure gauge detection oil hydraulic cylinder；
Slide in oil hydraulic cylinder and be provided with pressurizing piston, the end of pressurizing piston is provided with confined pressure pressure rod, and the cross section of confined pressure pressure rod is in arc
Shape；
Two confined pressure pressure rods in same coal sample tank are oppositely arranged；
Oil tank connects the entrance of oil pressure pump, and the outlet of oil pressure pump connects the oil-in of oil hydraulic cylinder by oil line pipe；
Drilling fluid fill assembly includes drilling well liquid case, vibrating motor and vibration chamber, is provided with vibrating arm in vibration chamber, vibrating arm with
Vibrating motor is connected；
Liquid booster pump is connected with by the first connecting pipe in the outlet of drilling well liquid case；
The outlet of liquid booster pump is provided with drilling fluid electronic pressure gauge by the second connecting pipe vibration chamber, the second connecting pipe
With drilling fluid electronic flowmeter；
The liquid outlet of vibration chamber connects the through hole on upper sleeve gasket cylinder by drilling fluid conduit, and drilling fluid conduit is provided with electronic valve
Door；
Gas injection component includes gas tank and the high-pressure pump being connected on gas tank, and the gas outlet of high-pressure pump is connected by gas path pipe
Through hole on upper sleeve gasket cylinder, gas path pipe is provided with electronic pressure gauge and electronic flowmeter；
Control assembly includes processing unit, pressure transducer, drilling fluid electronic pressure gauge, drilling fluid electronic flowmeter, electronics pressure
The signal output part of power meter, electronic flowmeter, outlet electronic pressure gauge and outlet electronic flowmeter is all connected with the letter of processing unit
Number input；Electronic valve drive circuit, electronic valve drive circuit control electricity are connected with the signal output part of processing unit
The work of sub- valve.
2. drilling process coal seam reservoirs pollution level test analog as claimed in claim 1, it is characterised in that：Also include
The sampling assemble equal with coal sample tank quantity, sampling assemble includes probe tube and the sample cock on probe tube, probe tube
One end connects with coal sample tank, and graduated cylinder is connected with the other end.
3. drilling process coal seam reservoirs pollution level test analog as claimed in claim 2, it is characterised in that：Adjacent coal
Slide assemblies are provided between sample tank, slide assemblies include sliding bar and the sliding groove being equipped with, and sliding bar is upper located at being located at
On the lateral wall of the coal sample tank of side, sliding groove is on the lateral wall of underlying coal sample tank.
4. drilling process coal seam reservoirs pollution level test analog as claimed in claim 3, it is characterised in that：Fixed case
In vivo wall is provided with dovetail groove, coordinates dovetail groove to be provided with clamp on the lateral wall of coal sample tank, and clamp is slideably positioned in dovetail groove
In.
5. drilling process coal seam reservoirs pollution level test analog as claimed in claim 4, it is characterised in that：Coal sample tank
The connecting hole being vertically arranged is provided with, steady pin is equipped with connecting hole.
6. drilling process coal seam reservoirs pollution level test analog as claimed in claim 5, it is characterised in that：Oil pressure pump
On be connected with diverter, each oil-out of diverter is connected respectively with the oil-in on oil hydraulic cylinder, and each of diverter is fuel-displaced
Oil circuit electromagnetic valve is provided with mouthful, coordinates oil circuit electromagnetic valve to be provided with driving circuit for electromagnetic valve, solenoid-driven in control assembly
Circuit connects the signal output part of processing unit, the work of driving circuit for electromagnetic valve oil circuit control electromagnetic valve.
7. the drilling process coal seam reservoirs pollution level test analog as described in claim 1 to 6 any one, its feature
It is：Also including gas recycling can and liquid recovery tank, gas recycling can and liquid recovery tank are close with bottom
Through hole connection on big envelope cylinder；Gas recycling can and liquid recovery tank with through hole with valvular pipeline by being connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621127873.XU CN206114626U (en) | 2016-10-18 | 2016-10-18 | Analogue means is used in drilling process coal reservoir pollution degree test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370789A (en) * | 2016-10-18 | 2017-02-01 | 河南理工大学 | Simulation device and method for testing contamination degree of coal reservoir in drilling process |
| CN108918327A (en) * | 2018-06-13 | 2018-11-30 | 中联煤层气有限责任公司 | For the preferred new method of additive for drilling fluid used in coalbed coring |
-
2016
- 2016-10-18 CN CN201621127873.XU patent/CN206114626U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370789A (en) * | 2016-10-18 | 2017-02-01 | 河南理工大学 | Simulation device and method for testing contamination degree of coal reservoir in drilling process |
| CN108918327A (en) * | 2018-06-13 | 2018-11-30 | 中联煤层气有限责任公司 | For the preferred new method of additive for drilling fluid used in coalbed coring |
| CN108918327B (en) * | 2018-06-13 | 2021-09-17 | 中联煤层气有限责任公司 | Novel method for optimizing drilling fluid treatment agent for coal seam characteristics |
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