CN109254027A - A kind of mud cake closure evaluating apparatus and evaluation method based on low-field nuclear magnetic resonance - Google Patents
A kind of mud cake closure evaluating apparatus and evaluation method based on low-field nuclear magnetic resonance Download PDFInfo
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- CN109254027A CN109254027A CN201811297339.7A CN201811297339A CN109254027A CN 109254027 A CN109254027 A CN 109254027A CN 201811297339 A CN201811297339 A CN 201811297339A CN 109254027 A CN109254027 A CN 109254027A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/082—Measurement of solid, liquid or gas content
Abstract
The present invention provides a kind of mud cake closure evaluating apparatus and method based on low-field nuclear magnetic resonance, and device includes that drilling fluid contains press filteration system, heating compression system and measuring system；It includes drilling fluid filter-pressing cauldron, formation core filling device that drilling fluid, which contains press filteration system, further includes that drilling fluid filtrate contains device and seals the sealing device of drilling fluid filter-pressing cauldron autoclave body；Heating compression system to include is heating device and nitrogen cylinder.Measuring system is MRI system, including main magnet, radio frequency center and signal receiver, radio-frequency pulse releasing unit, coil and signal processor.Evaluation method includes: filling rock core filling unit and drilling fluid；Heating pressurization；Experiment parameter is set, MRI system is started；Test constantly obtains nuclear magnetic signal data and nuclear magnetic resonance data figure；Mud cake seal-off effect is evaluated according to the semaphore of downfield nuclear magnetic resonance；The relaxation time of downfield nuclear magnetic resonance evaluates hydrophilic and hydrophobic；According to three-dimensional data chart, seal-off effect is evaluated.
Description
Technical field
The present invention relates to a kind of, and the mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus and evaluation method, belongs to mud cake envelope
Stifled technical field of performance test.
Background technique
When drilling well, under the action of bottom hole pressure difference, drilling fluid can rapid dehydration formed on the borehole wall have it is certain thickness
Mud layer is referred to as mud cake in engineering.Mud cake can prevent the moisture content of subsequent well liquid from entering stratum, inhibit borehole wall aquation, play
The important function of stabilizing borehole stability.In other words, engineering safety can be greatly improved in the mud cake of function admirable, greatly reduce
Drilling well economic loss.Thus, can the mud cake that designed in engineering form the fine and close and good mud cake of seal-off effect to closing weight in shaft bottom
It wants.And in recent years, during oil and gas drilling, because the engineering problem caused by borehole well instability is countless.Cause
This, the evaluation to mud cake sealing characteristics avoids borehole well instability from having important directive significance for smoothly completing drilling well.
Formation basic theory based on mud cake, a low-field nuclear magnetic resonance of present invention combination low-field nuclear magnetic resonance Technology design
Mud cake blocks evaluating apparatus and evaluation method.The forming process of drilling fluid mud cake under high-temperature and high-pressure conditions can be not only simulated,
Drilling fluid moisture content changes of contents and flowing in reaction kettle body can be also analyzed by low field nuclear-magnetism detection system simultaneously to change, it can be intuitive
Vivo plugging action of the observation mud cake to drilling fluid.
Summary of the invention
In order to solve problems in the prior art, the present invention provides a kind of mud cake closure evaluation dress based on low-field nuclear magnetic resonance
It sets and evaluation method, can not only simulate the forming process of drilling fluid mud cake under high-temperature and high-pressure conditions, while can also be by low
Drilling fluid moisture content changes of contents and flowing variation in the nuclear-magnetism detection system analysis reaction kettle body of field, can observe mud cake to dramatic
To the plugging action of drilling fluid.
The present invention in order to achieve the above technical purposes, adopts the following technical scheme that.
A kind of mud cake closure evaluating apparatus based on low-field nuclear magnetic resonance, including drilling fluid contains press filteration system, heating adds
Pressure system and measuring system；
It includes the drilling fluid filter-pressing cauldron for holding test drilling fluid that drilling fluid, which contains press filteration system, and one in drilling fluid filter-pressing cauldron
Side is provided with the formation core filling device of filling testing rock core, further includes the drilling well being arranged on the outside of formation core filling device
Liquid filtrate contains device, further includes the sealing device for sealing drilling fluid filter-pressing cauldron autoclave body；
Further include heating compression system, including the heating device heated for drilling fluid filter-pressing cauldron, and is drilling fluid filters pressing
Kettle autoclave body provides the nitrogen cylinder of pressure, and nitrogen cylinder is connected to drilling fluid filter-pressing cauldron autoclave body；
Measuring system is MRI system, comprising: main magnet is arranged outside drilling fluid filter-pressing cauldron autoclave body, radio frequency
Center and signal receiver, setting are arranged in the intracorporal radio-frequency pulse releasing unit of drilling fluid filter-pressing cauldron kettle in drilling fluid filters pressing
Coil and signal processor outside kettle autoclave body further include control for electronic signal caused by the magnetic resonance of receiving area's reason
System, to control the heating of heating device, the pulse train selection at radio frequency center and signal receiver, the selection of rf frequency
The processing of the electronic signal of setting, signal processor acquisition with experiment parameter, generates image.
Further, a kind of mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus, and measuring system can also include seeping
Saturating flow testing system, seepage discharge test macro includes the flowmeter that drilling fluid filtrate is arranged in and contains device, for reading
The volume that filtrate passes through testing rock core in unit time.
Further, a kind of mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus, based on based on mud cake closure comment
Valence device further includes the insulating rubber being arranged between drilling fluid filter-pressing cauldron autoclave body and main magnet.
A method of it is blocked and is evaluated using the mud cake that the mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus, including with
Lower step:
Step 1, the sampling rock core that experiment needs is put into rock core filling unit, is packed into and comments in drilling fluid filter-pressing cauldron autoclave body
Valence drilling fluid tightens the sealing unit of drilling fluid filter-pressing cauldron autoclave body.
Step 2, heating pressurization, simulating actual conditions are carried out to drilling fluid filter-pressing cauldron；
Step 3, nuclear magnetic resonance experiment parameter is set, MRI system is started, records experimental data；
MRI system is opened, nuclear-magnetism experiment parameter is set；
Step 4, MRI system test constantly obtains nuclear magnetic signal data and nuclear magnetic resonance data figure；
Step 5, mud cake seal-off effect is evaluated according to the semaphore of downfield nuclear magnetic resonance；According to speeding for downfield nuclear magnetic resonance
The hydrophilic and hydrophobic of Henan Time evaluation mud cake；According to the three-dimensional data chart that nuclear magnetic signal generates, the seal-off effect of appraisal drilling liquid mud cake.
Further, a kind of mud cake blocking evaluating apparatus using the mud cake based on low-field nuclear magnetic resonance blocks the side of evaluation
Method, in step 5, low field nuclear-magnetism Fid semaphore semaphore is bigger, represents that the intracorporal residual moisture content of kettle is bigger, illustrates to generate
Mud cake sealing characteristics is good, conversely, then mud cake sealing characteristics is poor.
A method of evaluation, step 5 are blocked using the mud cake that the mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus
In, the hydrophobicity of the bigger mud cake of relaxation is strong；Conversely, relaxation is smaller, the hydrophily of mud cake is strong.
A method of evaluation, step 5 are blocked using the mud cake that the mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus
In, nuclear-magnetism image three-dimensional data, the higher mud cake seal-off effect of brightness is poor in space, and brightness is lower, and mud cake seal-off effect is stronger.
A method of evaluation being blocked using the mud cake that the mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus, further includes
Step 6, mud cake seal-off effect is judged according to flow meter reading, flow meter reading is smaller, and mud cake seal-off effect is strong；Conversely, mud cake blocks
Property is poor.
The present invention by adopting the above technical scheme, obtains following technical effect.
The present invention is based on the formation basic theories of mud cake, in conjunction with the low field of a evaluation mud cake of low-field nuclear magnetic resonance Technology design
Nuclear magnetic resonance device.The forming process of drilling fluid mud cake under high-temperature and high-pressure conditions can be simulated, while can also pass through low field core
Magnetic detection system analyzes drilling fluid moisture content changes of contents and flowing variation in reaction kettle body, can observe to dramatic mud cake to brill
The plugging action of well liquid.
The device and method analog formation condition, provides the experimental situation of high temperature and pressure, can analyze mud under the conditions of stratum
The forming process of cake.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the mud cake of the invention based on low-field nuclear magnetic resonance blocks evaluating apparatus；
Fig. 2 is that the T2 of moisture content in the remaining drilling fluid of experimental example of the invention is distributed map；
Fig. 3 obtains the linear conversion relation figure of Fid signal amplitude Yu pure water quality for experimental example of the invention；
Fig. 4 be experimental example of the invention high performance drilling experiment mud cake areal cross-section low-field nuclear magnetic resonance at
As figure (LF-MRI).
Fig. 5 be experimental example of the invention unstable drilling fluid experiment mud cake areal cross-section low-field nuclear magnetic resonance at
As figure (LF-MRI).
Appended drawing reference lists as follows: 1 is operator, and 2 be control system, and 3 discharge for signal and receive center, and 4 be to penetrate
Frequency center and signal receiver, 5 be signal processor, and 6 be nitrogen cylinder, and 7 sealing units, 8 be radio-frequency pulse releasing unit, and 9 are
Coil, 10 be drilling fluid filter-pressing cauldron, and 11 be heating unit, and 12 be insulating rubber, and 13 be formation core fills unit, and 14 be drilling well
Liquid filtrate contains unit, and 15 be flowmeter, and 16 be power supply, and 17 be main magnet.
Specific embodiment
With reference to the accompanying drawing and specific embodiment, technical solution of the present invention is further described, makes this
The technical staff in field can better understand the present invention and can be practiced.
Mud cake based on low-field nuclear magnetic resonance of the invention blocks evaluating apparatus, can be used to simulation stratum condition, provides height
The experimental situation of warm high pressure can analyze the forming process of mud cake under the conditions of stratum.
Referring to Fig. 1, the mud cake of the invention based on low-field nuclear magnetic resonance blocks evaluating apparatus, including drilling fluid contains filters pressing
System, specifically, including drilling fluid filter-pressing cauldron 10, autoclave body is to hold test drilling fluid；Further include in drilling fluid filter-pressing cauldron 10
Formation core filling device 13, to fill testing rock core；It further, further include being arranged outside formation core filling device 13
The drilling fluid filtrate of side contains device 14, to collect the drilling fluid for penetrating the testing rock core of rock core filling device 13；Further include
Sealing device 7 prevents gas or drilling fluid leakage, pressure in autoclave body to realize the sealing of 10 autoclave body of drilling fluid filter-pressing cauldron
It falls after rise.
Specifically, drilling fluid filter-pressing cauldron 10 is horizontal retort, since the seepage direction of down-hole drilling fluids is laterally that horizontal retort can
Preferably to simulate the leak-off process of drilling fluid.Preferably, drilling fluid filter-pressing cauldron 10 is forged using high temperature and pressure steel body, heatproof
400 DEG C, pressure-resistant 20MPa.
In addition, drilling fluid filter-pressing cauldron 10 is equipped with rock core filling device 13, phase of the drilling fluid with rock stratum can be effectively simulated
Interaction.Rock core filling device 13 and one end of drilling fluid filter-pressing cauldron 10 are closely coupled, and the upper end, which is opened, switchable notch,
Rock core is tested to place, experiment rock core is cut according to filter-pressing cauldron body inner diameter size, and rock core is added by switchable notch
Filling device 13.The setting of rock core filling device 13 can be interacted with analog study drilling fluid and rock stratum, judge that can mud cake
Drilling fluid is stopped to enter stratum.
Further, the mud cake of the invention based on low-field nuclear magnetic resonance blocks evaluating apparatus, further includes heating compression train
System, to filter the heating pressurization of kettle 10 for drilling hydraulic, specifically, including to filter the heating device that kettle 10 heats for drilling hydraulic
11, and the nitrogen cylinder 6 of pressure is provided for 10 autoclave body of drilling fluid filter-pressing cauldron.
Drilling fluid filter-pressing cauldron 10 and its interior drilling fluid can be heated to 30~300 DEG C by heating device 11, preferably electric
Heating device.
Nitrogen cylinder 6 is connected to drilling fluid filter-pressing cauldron 10, and is supplied for drilling liquid pressure kettle 10.Preferably, can pass through to
10 inflated with nitrogen of drilling fluid filter-pressing cauldron provides the pressure of 1~10MPa for it.
Mud cake based on low-field nuclear magnetic resonance of the invention blocks evaluating apparatus, further includes to measure mud cake sealing characteristics
Measuring system.In one embodiment, measuring system is MRI system, to make in drilling hydraulic filter kettle 10
Drilling fluid generate nuclear magnetic resonance, and to nuclear magnetic signal carry out data processing, generate datagram.Specifically, Magnetic resonance imaging
System includes:
Main magnet 17 is arranged outside 10 autoclave body of drilling fluid filter-pressing cauldron, can choose permanent magnet as main magnet, so that drilling well
Drilling fluid in liquid filter-pressing cauldron 10 is in magnetic field.
Radio frequency center and signal receiver 4, on the one hand, radio frequency center can provide electronic radio-frequency pulse, specifically, provide
Magnetic field strength is 0.3~0.5T；On the other hand, signal receiver its also can receive nuclear magnetic resonance caused by electronic signal.Tool
Body, by radio frequency center and signal receiver 4, can according to need strobe pulse sequence (such as CPMG sequence, HASTE sequence,
EPI sequence) and rf frequency, select sampling parameter.Sampling parameter includes: repetition waiting time Tw: repeating to wait by control
Time can reduce signal interference, reduce experimental error；Sampling number TD: sampling number is bigger, and signal is more accurate, and error is got over
Small, experimental result is closer to true value；Accumulative sampling number NS: by increasing sampling number, experiment can be further decreased and missed
Difference.
Radio-frequency pulse releasing unit 8, it is preferred that be pulse release coil, be arranged in 10 autoclave body of drilling fluid filter-pressing cauldron, use
To discharge the radio-frequency pulse at radio frequency center and the offer of signal receiver 4, so that the drilling fluid in magnetic field generates nuclear magnetic resonance.
Coil 9 is arranged outside 10 autoclave body of drilling fluid filter-pressing cauldron, and the nuclear magnetic resonance of atom is made to be converted into the e-mail of macroscopic view
Number.Its principle is that the magnetisable atom of the drilling fluid in magnetic field generates magnetic resonance, macroscopic magnetization arrow under the excitation of radio-frequency pulse
Amount changes, sectioned coil, generates the electronic signal of certain frequency.
Signal processor 5 is to handle signal.
The mud cake of low-field nuclear magnetic resonance of the invention blocks evaluating apparatus, further includes control system, to control heating dress
Set 11 heating, the pulse train selection at radio frequency center and signal receiver 4, the selection of rf frequency and setting for experiment parameter
It sets, the processing for the electronic signal that signal processor 5 acquires, generates image.
In another embodiment, measurement component can also include seepage discharge test macro, infiltrate into test
Filtrate contains the flow of the drilling fluid of device 14.Specifically, include the flowmeter 15 that drilling fluid filtrate is set and contains device 14,
For reading the volume of filtrate in the unit time by rock core, to calculate the percolation flow velocity of drilling fluid.
As a preferred solution, mud cake of the invention based on low-field nuclear magnetic resonance block evaluating apparatus further include every
Hot rubber 12 is arranged between 10 autoclave body of drilling fluid filter-pressing cauldron and main magnet 17, primarily serves heat insulation, prevents damage both ends
Magnet.Insulating rubber is rubber with heat insulating function but on nuclear magnetic signal without influence, specifically, for propylene class high temperature resistant without
Low field nuclear magnetic signal rubber.
The mud cake that the present invention also provides a kind of using above-mentioned based on low-field nuclear magnetic resonance blocks evaluating apparatus and carries out mud cake envelope
The method of stifled evaluation, comprising the following steps:
Step 1, the sampling rock core that experiment needs is put into rock core filling unit 13, is filled in 10 autoclave body of drilling fluid filter-pressing cauldron
Enter evaluation drilling fluid, tightens the sealing unit 7 of 10 autoclave body of drilling fluid filter-pressing cauldron.
In this step, sample rock core size should according to rock core fill unit 13 dischargeable capacity be sampled, and by its
It fills in rock core unit.
When being packed into drilling fluid, drilling fluid should not be filled with 10 autoclave body of drilling fluid filter-pressing cauldron, should there are 5 for autoclave body volume
~10% spare space, builds the pressure conducive to autoclave body.
The sealing unit 7 of 10 autoclave body of drilling fluid filter-pressing cauldron is tightened, in order to avoid the intracorporal drilling fluid of kettle or gas outflow.
Step 2, heating pressurization, simulating actual conditions are carried out to drilling fluid filter-pressing cauldron 10.
In this step, drilling fluid is heated by heating unit 11, reaches specified experimental temperature.The present invention
In, experimental temperature range is 30~250 DEG C.
After filters pressing autoclave body reaches specified experimental temperature, nitrogen cylinder is opened, nitrogen is injected in autoclave body, pressure in kettle is made to begin
Experiment specified pressure is remained eventually.In the present invention, experimental pressure range is 2~4MPa.
Step 3, nuclear magnetic resonance experiment parameter is set, MRI system is started, records experimental data.
MRI system is opened, nuclear-magnetism experiment parameter, including rf frequency (RF), repetition waiting time are set
(TW), sampling number (TD), sampling interval duration (TE) start MRI system.
Specifically, in radio frequency center and signal receiver 4, setting rf frequency is arranged 20~22MHz, when the sampling interval
Between not less than lower limit be 1ms, repeat 1000~10000ms of waiting time.
In the process, the electronic impulse that specific frequency is discharged by radio-frequency pulse releasing unit 8, the brill in magnetic field
Well liquid generates nuclear magnetic resonance, while receiving the electronic signal that drilling fluid magnetic resonance is caused by coil 9, passes through signal processor
5, it acquires nuclear magnetic signal and carries out data processing.
Step 4, MRI system test constantly obtains nuclear magnetic signal data and nuclear magnetic resonance data figure.
Step 5, mud cake seal-off effect is evaluated according to the semaphore of downfield nuclear magnetic resonance；
Drilling fluid moisture residual volume is Fid (the free induction decay) signal measured based on low field MR system
Moisture content is positively correlated in amount, low field nuclear-magnetism Fid semaphore size and drilling fluid, and semaphore is bigger, represents the intracorporal remnants of kettle
Water content is bigger, illustrates that the mud cake sealing characteristics generated is good.Conversely, then mud cake sealing characteristics is poor.
Also the moisture in sample can be determined by determining calibration method, to calculate after filters pressing residual amount in drilling fluid.
The hydrophilic and hydrophobic of mud cake is evaluated according to the relaxation time of downfield nuclear magnetic resonance；
Low-field nuclear magnetic resonance not only can reaction and judgement mud cake seal-off effect, can also further judge mud cake by the relaxation time
Hydrophilic and hydrophobic.The Hydrogen Proton that the magnetic resonance of upper state is excited in so-called relaxation time, that is, water releases energy, and to be restored to magnetic total
Time needed for lower state before vibration.And this time (relaxation time) environment as locating for proton is related, embodies suffered by proton
Bound i.e. motility.The hydrophilic and hydrophobic of mud cake is judged according to relaxation time size, relaxation is bigger, and surface moisture is freer,
It is small by mud cake constraint effect, show that the hydrophobicity of mud cake is strong；Conversely, relaxation is smaller, show that the hydrophily of mud cake is strong.
According to the three-dimensional data chart that nuclear magnetic signal generates, the spatial distribution of appraisal drilling liquid moisture content；
Magnetic resonance imaging is based on Fid signal, obtains core by the LF-NMR imaging software that Shanghai Niu Mai electronics corporation provides
Magnetic resonance image.
According to picture appraisal seal-off effect, the higher residual amount that represents of brightness is bigger in space, and mud cake seal-off effect is poor, and brightness is got over
The low residual amount that represents is smaller, and mud cake seal-off effect is stronger.
Further, mud cake seal-off effect is judged according to flow meter reading；
Specifically, flow meter reading is smaller, shows that the amount of liquid for passing through mud cake in the unit time is smaller, illustrate that mud cake blocks
Property is strong；Conversely, mud cake seal-off effect is poor.
Experimental example:
The mud cake based on low-field nuclear magnetic resonance according to specific embodiment blocks evaluating apparatus and evaluation method, carries out such as
Under experiment:
Using Sichuan Province's Yibin City Longma small stream group mud shale is picked up from as testing rock core, it is cut to correspondingly sized, general
It, which is placed in, is put into rock core filling unit 13.
Selection high performance drilling and unstable drilling fluid are tested, wherein high performance drilling composition are as follows: bentonite
3%, sodium chloride 2%, polyethyleneimine 0.2~0.5%, hexamethylene diamine 0.5~1.0%, polyanion cellulose 0.2~0.5%.
Unstable drilling fluid composition are as follows: bentonite 3%, sodium chloride 2%, polyanion cellulose 0.2~0.5%.
150 DEG C of choice experiment temperature, experimental pressure 3.5MPa, rf frequency 21.5MHz, waiting time 2000ms is repeated,
Sampling number 3600428, sampling interval duration 1.0002ms are tested according to the method in specific embodiment, obtain as
Under experimental result.
Attached drawing 2 is to test moisture water relaxation T2 distribution in obtained remaining drilling fluid.Each peak T2 represents in T2 spectrogram
A kind of moisture content of state further judges moisture content state according to relaxation time size.As shown in Figure 2, main in remaining drilling fluid
Containing two states moisture content, the relaxation time is located at the moisture content of 0.001~1ms for the water near mud cake, due to by mud cake beam
Effect is tied up, the relaxation time is smaller.Relaxation time be located at 10~1000ms moisture content be autoclave body in flow freely moisture content, hardly by
Mudcake effect.
According to T2 peak area size, irreducible water and free water content are judged, judge remaining water inventory.
It is distributed according to the peak T2 relaxation, judges mud cake hydrophilic and hydrophobic, the T2 distribution at the peak irreducible water T2 is smaller, shows mud cake to water
Part it is bound stronger, i.e. mud cake hydrophily is stronger；On the contrary, the peak T2 T2 Distribution Value is bigger, show that mud cake is bound to moisture content
Weaker, i.e. mud cake hydrophobicity is stronger.
By integrating T2 peak area, the Fid signal amplitude of every kind of moisture content is obtained.It is calibrated by pure water, obtains Fid signal width
The linear conversion relation of value and pure water quality, is shown in attached drawing 3.According to the signal amplitude of T2 map difference water peak, different shapes are conversed
The quality of state moisture content.
Attached drawing 4 is the low-field nuclear magnetic resonance image (LF-MRI) of the mud cake areal cross-section of high performance drilling experiment.
Attached drawing 5 is the low-field nuclear magnetic resonance image (LF-MRI) of the mud cake areal cross-section of unstable drilling fluid experiment.
Find out that its brightness is relatively low from the LF-MRI of attached drawing 4 imaging, but moisture content is also mainly distributed on mud cake outer ring, the mud of formation
Cake is hydrophobicity mud cake.
Find out that its brightness is higher from the LF-MRI of attached drawing 5 imaging, it is evident that water content is big, and the main integrated distribution of moisture is in mud
Cake outer ring, the mud cake of formation are hydrophily mud cake.
Two kinds of different type drilling fluid results of study are as shown in table 1 below, and by nuclear magnetic resonance experiment data, evaluation obtains height
Performance drilling fluid institute shows hydrophobicity at mud cake, and seal-off effect is stronger, and unstable drilling fluid institute shows hydrophily at mud cake, seals
Stifled property is weaker.
Following table is the mud cake performance table obtained according to nuclear magnetic resonance experiment evaluation of result.
1 mud cake performance evaluation of table
Moisture type is judged by following methods: it is irreducible water that the experiment relaxation time, which is located at the moisture content of 0.001~1ms, is relaxed
The moisture content that the Henan time is located at 10~1000ms is Free water.
Technical solution provided by the invention, is not restricted to the described embodiments, it is all by structure of the invention and in the way of,
By converting and replacement is formed by technical solution, all within the scope of the present invention.
Claims (8)
1. a kind of mud cake based on low-field nuclear magnetic resonance blocks evaluating apparatus, it is characterised in that: contain filters pressing system including drilling fluid
System, heating compression system and measuring system；
It includes the drilling fluid filter-pressing cauldron (10) for holding test drilling fluid that drilling fluid, which contains press filteration system, and drilling fluid filter-pressing cauldron (10) is interior
Side be provided with filling testing rock core formation core filling device (13), further include be arranged in formation core filling device
(13) drilling fluid filtrate on the outside of contains device (14), further includes the sealing device (7) for sealing drilling fluid filter-pressing cauldron (10) autoclave body；
Further include heating compression system, including the heating device (11) heated for drilling fluid filter-pressing cauldron (10), and is drilling fluid
Filter-pressing cauldron (10) autoclave body provides the nitrogen cylinder (6) of pressure, and nitrogen cylinder (6) is connected to drilling fluid filter-pressing cauldron (10) autoclave body；
Measuring system is MRI system, comprising: main magnet (17) is arranged outside drilling fluid filter-pressing cauldron (10) autoclave body,
Radio frequency center and signal receiver (4) are arranged in the intracorporal radio-frequency pulse releasing unit (8) of drilling fluid filter-pressing cauldron (10) kettle, if
Coil (9) and signal processor (5) outside drilling fluid filter-pressing cauldron (10) autoclave body are set, receiving area's reason magnetic resonance institute is used for
The electronic signal of generation further includes control system, to control heating, radio frequency center and the signal receiver of heating device (11)
(4) pulse train selection, the electronic signal of setting, signal processor (5) acquisition of the selection and experiment parameter of rf frequency
Processing, generate image.
2. a kind of mud cake based on low-field nuclear magnetic resonance according to claim 1 blocks evaluating apparatus, it is characterised in that: survey
Amount system can also include seepage discharge test macro, and seepage discharge test macro includes setting in drilling fluid filtrate splendid attire device
(14) flowmeter (15), for reading the volume that filtrate passes through testing rock core in the unit time.
3. a kind of mud cake based on low-field nuclear magnetic resonance according to claim 1 blocks evaluating apparatus, it is characterised in that: base
In based on mud cake block evaluating apparatus further include be arranged between drilling fluid filter-pressing cauldron (10) autoclave body and main magnet (17) every
Hot rubber (12).
4. the mud cake that a kind of mud cake using described in claims 1 to 33 based on low-field nuclear magnetic resonance blocks evaluating apparatus blocks
The method of evaluation, it is characterised in that: include the following steps,
Step 1, the sampling rock core that experiment needs is put into rock core filling unit (13), is filled in drilling fluid filter-pressing cauldron (10) autoclave body
Enter evaluation drilling fluid, tightens the sealing unit (7) of drilling fluid filter-pressing cauldron (10) autoclave body；
Step 2, heating pressurization, simulating actual conditions are carried out to drilling fluid filter-pressing cauldron (10)；
Step 3, nuclear magnetic resonance experiment parameter is set, MRI system is started, records experimental data；
MRI system is opened, nuclear-magnetism experiment parameter is set；
Step 4, MRI system test constantly obtains nuclear magnetic signal data and nuclear magnetic resonance data figure；
Step 5, mud cake seal-off effect is evaluated according to the semaphore of downfield nuclear magnetic resonance；When according to the relaxation of downfield nuclear magnetic resonance
Between evaluate mud cake hydrophilic and hydrophobic；According to the three-dimensional data chart that nuclear magnetic signal generates, the seal-off effect of appraisal drilling liquid mud cake.
5. the mud cake that the mud cake according to claim 4 based on low-field nuclear magnetic resonance blocks evaluating apparatus blocks evaluation
Method, it is characterised in that: in step 5, low field nuclear-magnetism Fid semaphore semaphore is bigger, represents the intracorporal residual moisture content of kettle and gets over
Greatly, illustrate that the mud cake sealing characteristics generated is good, conversely, then mud cake sealing characteristics is poor.
6. it is according to claim 4 based on mud cake block the method that the mud cake of evaluating apparatus blocks evaluation, feature exists
In: in step 5, the hydrophobicity of the bigger mud cake of relaxation is strong；Conversely, relaxation is smaller, the hydrophily of mud cake is strong.
7. it is according to claim 4 based on mud cake block the method that the mud cake of evaluating apparatus blocks evaluation, feature exists
In: in step 5, nuclear-magnetism image three-dimensional data, the higher mud cake seal-off effect of brightness is poor in space, and the lower mud cake seal-off effect of brightness is more
By force.
8. it is according to claim 4 based on mud cake block the method that the mud cake of evaluating apparatus blocks evaluation, feature exists
In: further include step 6, mud cake seal-off effect is judged according to flow meter reading, flow meter reading is smaller, and mud cake seal-off effect is strong；Conversely,
Mud cake seal-off effect is poor.
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| CN110284880A (en) * | 2019-06-18 | 2019-09-27 | 中国石油大学(华东) | A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device and its working method |
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