CN208155804U - Compact reservoir rock electrical measurement based on nuclear magnetic resonance - Google Patents
Compact reservoir rock electrical measurement based on nuclear magnetic resonance Download PDFInfo
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- CN208155804U CN208155804U CN201820762826.5U CN201820762826U CN208155804U CN 208155804 U CN208155804 U CN 208155804U CN 201820762826 U CN201820762826 U CN 201820762826U CN 208155804 U CN208155804 U CN 208155804U
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Abstract
The compact reservoir rock electrical measurement based on nuclear magnetic resonance that the utility model discloses a kind of, its capillary pressure electrical property combined measuring instrument for including includes high pressure nitrogen storage tank, confining pressure pump and the core holding unit for clamping rock sample, high pressure nitrogen storage tank and confining pressure pump are connect by pipeline with core holding unit one end, and the pipeline connected on the other end of core holding unit extends in measurement bottle；The measurement that core holding unit is placed in Nuclear Magnetic Resonance is intracavitary, it is provided with the first valve and first pressure controller on pipeline between high pressure nitrogen storage tank and core holding unit, is provided with the second valve and second pressure controller on the pipeline between confining pressure pump and core holding unit；Third valve is provided on pipeline between core holding unit and measurement bottle；The both ends of core holding unit pass through an electrode respectively and connect with LCR digital electric bridge, and first pressure controller, second pressure controller, LCR digital electric bridge and Nuclear Magnetic Resonance are connect with data acquisition control platform.
Description
Technical field
The utility model relates to compact reservoir performance study fields, and in particular to a kind of compact reservoir based on nuclear magnetic resonance
Rock electrical measurement.
Background technique
Currently, compact reservoir pore structure and rock composition are complicated, reservoir space is various, heterogeneity is strong, thus it is multiple to it
The log response of miscellaneous pore throat system lacks always systematic research, so that compact reservoir evaluation effect is bad, complicated reservoirs well logging
Interpretation coincidence rate is low, it is difficult to accurately obtain hydrocarbon saturation, be also shown using traditional Archie formula and Fei Aer occurred
Kink characteristics.
Common reservoir pore throat character characterization technique means mainly have casting body flake, scanning electron microscope, capillary pressure curve method
(pressure mercury technology), nuclear magnetic resonance and micro-nano-CT scan technology etc..Wherein casting body flake and scanning electron microscope can only all be directed to some
Two-dimensional cross-section is observed, and is handled by subsequent image and is extracted limited two-dimentional pore throat character information.
The most commonly used is pressure mercury technologies for capillary pressure curve method, conventional to press mercury technology that directly measure throat quantity, only
Different throat radiuses can be provided and correspond to the volume distribution that throat is controlled.Constant speed pressure mercury technology is limited by into mercury pressure, can not
It identifies hole and venturi of the radius less than 0.119 μm, and further relates to the use of noxious material.Micro-nano-CT scan method, scanning speed
Degree is fast, and scanning coverage area is big, provides pore throat character quantitative parameter, but measurement method is complicated, and costly.
Utility model content
For above-mentioned deficiency in the prior art, the compact reservoir rock electrical measurement provided by the utility model based on nuclear magnetic resonance
Amount device can calculate multiple rock electrical parameters of compact reservoir by the parameter of measurement.
In order to achieve the above object of the invention, the technical solution adopted in the utility model is：
A kind of compact reservoir rock electrical measurement based on nuclear magnetic resonance is provided comprising capillary pressure electrical property combined measuring instrument,
Nuclear Magnetic Resonance and data acquisition control platform；Capillary pressure electrical property combined measuring instrument include high pressure nitrogen storage tank, confining pressure pump and for filling
The core holding unit of rock sample is pressed from both sides, high pressure nitrogen storage tank and confining pressure pump are connect by pipeline with core holding unit one end, rock core folder
The pipeline connected on the other end of holder extends in the measurement bottle being placed on weighing device；
The measurement that core holding unit is placed in Nuclear Magnetic Resonance is intracavitary, the pipe between high pressure nitrogen storage tank and core holding unit
It is provided with the first valve and first pressure controller on road, is provided with the second valve on the pipeline between confining pressure pump and core holding unit
Door and second pressure controller；Third valve is provided on pipeline between core holding unit and measurement bottle；
The both ends of core holding unit pass through an electrode respectively and connect with the LCR digital electric bridge for measuring rock sample resistance,
First pressure controller, second pressure controller, LCR digital electric bridge, Nuclear Magnetic Resonance and weighing device are acquired with data and are controlled
Platform connection processed.
The beneficial effects of the utility model are：The rock sample of saturation is placed in core holding unit by this programme, is seeped using half
Baffle method and Nuclear Magnetic Resonance combine, and apply certain confining pressure and displacement pressure to saturation rock sample by high-pressure nitrogen bottle and confining pressure pump
Power can be measured in displacement process under different water cut saturation degree in anhydrous outflow by LCR digital electric bridge and Nuclear Magnetic Resonance
Rock core resistance and T2Spectrum and capillary pressure；
Data acquisition control platform passes through rock core resistance and T2Spectrum and capillary pressure can be monitored entire measuring device,
Resistivity, capillary pressure and the pore radius of rock sample under real-time measurement different water cut saturation degree, thus to the throat distribution of rock sample
And hydrocarbon saturation carries out effectively evaluating and analysis.
Detailed description of the invention
Fig. 1 is the schematic diagram of the compact reservoir rock electrical measurement based on nuclear magnetic resonance.
Wherein, the 1, first valve；2, the second valve；3, third valve；4, high pressure nitrogen storage tank；5, first pressure controls
Device；6, core holding unit；7, Nuclear Magnetic Resonance；8, LCR digital electric bridge；9, electrode；11, temperature collecting module；12, the time controls
Device；13, confining pressure pumps；14, second pressure controller；15, bottle is measured；16, weighing device；17, pressure acquisition devices；18, data are adopted
Collect console；19, hydrophilic partition.
Specific embodiment
Specific embodiment of the present utility model is described below, in order to facilitate understanding by those skilled in the art
The utility model, it should be apparent that the utility model is not limited to the range of specific embodiment, to the common skill of the art
For art personnel, if various change the attached claims limit and determine the utility model spirit and scope in,
These variations are it will be apparent that all are created using the utility model of the utility model design in the column of protection.
As shown in Figure 1, should compact reservoir rock electrical measurement based on nuclear magnetic resonance include capillary pressure electrical property combined measuring instrument,
Nuclear Magnetic Resonance 7 and data acquisition control platform 18；Capillary pressure electrical property combined measuring instrument includes high pressure nitrogen storage tank 4,13 and of confining pressure pump
For the core holding unit 6 of clamping rock sample, high pressure nitrogen storage tank 4 and confining pressure pump 13 pass through pipeline and 6 one end of core holding unit
It connects, the pipeline connected on the other end of core holding unit 6 extends in the measurement bottle 15 being placed on weighing device 16.
The measurement that core holding unit 6 is placed in Nuclear Magnetic Resonance 7 is intracavitary, between high pressure nitrogen storage tank 4 and core holding unit 6
Pipeline on be provided with the first valve 1 and first pressure controller 5, is set on the pipeline between confining pressure pump 13 and core holding unit 6
It is equipped with the second valve 2 and second pressure controller 14；Third valve is provided on pipeline between core holding unit 6 and measurement bottle 15
Door 3.
Weighing device 16 therein is electronic balance, and the weight difference that when saturated-water phase adjacent by rock sample measures can be with
The water of rock sample discharge is obtained, the quality by the way that water is discharged can quickly calculate the water saturation of rock sample at this time.
Wherein, first pressure controller 5 and second pressure controller 14 are actually a pressure sensor, can select type
Number be PT124G-128 pressure sensor, data acquisition control platform 18 can be a computer, control chip can also be selected,
Its model TMS320DSC2X.
As shown in Figure 1, the temperature collecting module 11 connecting with data acquisition control platform 18 is provided on core holding unit 6,
Temperature collecting module 11 can select thermometer or temperature sensor, when for temperature sensor, can select model
DS18B20 digital temperature sensor.
The both ends of core holding unit 6 pass through an electrode 9 respectively and connect with the LCR digital electric bridge 8 for measuring rock sample resistance
Connect, first pressure controller 5, second pressure controller 14, LCR digital electric bridge 8, Nuclear Magnetic Resonance 7 and weighing device 16 with
Data acquisition control platform 18 connects.
The first valve 1, the second valve 2 and the third valve 3 that this programme is mentioned can be common manually opened closing
Valve can also select the solenoid valve that can be automatically adjusted but to facilitating realization automation control, but the first valve at this time
The 1, second valve 2 of door and third valve 3 are required to connect with data acquisition control platform 18.
When in use, high pressure nitrogen storage tank 4 and the first valve 1 are matched for mentioning this measuring device to core holding unit 6
For displacement pressure, first pressure controller 5 is used to acquire the pressure in corresponding pipeline, and data acquisition control platform 18 is acquired by it
Pressure data judge to core holding unit 6 provide displacement pressure whether reach setting value.
Confining pressure pump 13 matches user with the second valve 2 and provides confining pressure to core holding unit 6, and second pressure is controlled for adopting
Collect the pressure in corresponding pipeline, data acquisition control platform 18 judges to provide to core holding unit 6 by the pressure data of its acquisition
Confining pressure whether reach setting value.
When the anhydrous outflow of the pipeline connecting with measurement bottle 15, show that rock sample is in saturated-water phase, at this time first pressure
The pressure that controller 5 acquires is capillary pressure, in the data that LCR digital electric bridge 8 and Nuclear Magnetic Resonance 7 can be acquired at any time
Data acquisition control platform 18 is reached, when rock sample is not in saturated-water phase, data acquisition control platform 18 can be when setting
Between record it is primary, when rock sample is in saturated-water phase, data acquisition control platform 18 need to record the moment capillary pressure,
The T of resistance, Nuclear Magnetic Resonance 7 that LCR digital electric bridge 8 acquires2The temperature of spectrum and rock sample.
When implementation, the both ends that the seal chamber of rock core is placed inside the preferred core holding unit 6 of this programme are placed with and rock sample two
The hydrophilic partition 19 of end in contact, be arranged after hydrophilic partition 19 can before the capillary pressure for breaking through certain venturi, avoid gas into
Enter in rock sample, with the accuracy of each data measured during guarantee test.
Wherein, the principle of baffle method is that hydrophilic partition only allows water to pass through in the case where being no more than a certain pressure, without
Gas is allowed to pass through.It is non-only when additional displacement pressure is equal to or more than the capillary pressure of certain venturi in displacement process
Wetting phase (gas) could pass through venturi, and wetting phase fluid (water) is discharged into hole.It can be calculated by the water yield of measurement
Core water saturation out, while LCR digital electric bridge 8 can measure the rock sample resistance under the saturation degree, impressed pressure is with regard to phase
When in the capillary pressure of certain venturi).
When implementation, the pressure connecting with data acquisition control platform 18 is provided between measurement bottle 15 and third valve 3 and is adopted
Storage 17 can select the pressure sensor of model PT124G-128, and the setting of the pressure acquisition devices 17 can pass through it
The pressure signal of acquisition judges whether there are flowing out in rock sample, avoids artificial observation from error occur and causes subsequent rock electrical parameters
Calculating inaccuracy.
Referring again to FIGS. 1, the compact reservoir rock electrical measurement that this programme is preferably based on nuclear magnetic resonance further includes when implementing
The time controller 12 being connect respectively with Nuclear Magnetic Resonance 7, LCR digital electric bridge 8 and data acquisition control platform 18；Time control is set
After device 12 processed, Nuclear Magnetic Resonance 7 and LCR digital electric bridge 8 can be controlled by time controller 12 and upload one every setting time
The data of secondary acquisition.
The measuring device that this programme provides seeps baffle method and nuclear magnetic resonance technique equipment real-time measurement different water cut using half
The resistivity, capillary pressure and throat distribution, measuring principle of rock sample are as follows under saturation degree：
The resistivity for seeping baffle method measurement rock sample with half, configuration water flooding first is saturated rock sample, then passes through high pressure
Nitrogen cylinder and confining pressure pump 13 pairs of rock samples and apply certain confining pressure and displacement pressure, pass through LCR digital electric bridge 8 and Nuclear Magnetic Resonance 7, note
Record the rock core resistance and T before displacement in 100% saturation conditions and displacement process under different water cut saturation degree2Spectrum and capillary pressure,
Pore radius and resistivity under different water cut saturation degree are obtained by reduction formula (1), (2) (5) and (6), is passed through in the process
Time controller 12 sets certain time (half an hour) implementation real-time monitoring, and passes through data acquisition device and carry out entire experiment dress
It sets and is monitored, so that the throat distribution and hydrocarbon saturation to rock sample carry out effectively evaluating and analysis.
So far the detailed description of the compact reservoir rock electrical measurement based on nuclear magnetic resonance is completed, below then using survey
The method of amount device measurement rock electrical parameters is described in detail.
The method of the compact reservoir rock electrical measurement measurement rock electrical parameters based on nuclear magnetic resonance includes step S1
To step S10.
In step sl, the drying rock sample at compact reservoir is obtained, and records the porosity of rock sample, permeability, length, do
Weight and diameter, configure water flooding, and be saturated in the case where setting pressure to rock sample, and measure the saturation weight of rock sample later；
In step s 2, after emptying the gas and moisture in measuring device, the first valve 1, the second valve 2 and the are closed
Three valves 3, the rock sample of saturation are placed in the seal chamber of core holding unit 6, open Nuclear Magnetic Resonance 7 and LCR digital electric bridge
8, and rock sample temperature when recording the fully saturated water of rock sample, capillary pressure P0, resistance and T2Spectrum.
To in measuring device gas and moisture whether empty when judging, mainly pass through first pressure controller
5, second pressure controller 14 and pressure acquisition devices 17, which cooperate, realizes, if first pressure controller 5, second pressure controller
14 and the equal no signal of pressure acquisition devices 17 export when, show that the gas and moisture in measuring device have emptied.
In step s3, according to the rock sample temperature of record, resistance and NMR relaxation time, it is fully saturated to calculate rock sample
Resistivity, formation factor and pore radius when water：
rc=ρ FST2 (3)
Wherein, rock sample temperature when T is rock sample fully saturated water, DEG C；RoResistivity when water fully saturated for rock sample,
Ω·m；r0Resistance when water fully saturated for rock sample, Ω；C is 9 coefficient of electrode (c=1.072)；F is formation factor；RwFor ground
Layer water resistance rate, Ω m；φ is porosity；M is cementation factor；A is lithology factor；a1、b1For constant；T2For nuclear magnetic resonance cross
To the relaxation time；ρ is rock lateral surfaces relaxation rate；S/V indicates hole specific surface；FSIt is the pore shape factor (to spherical pore
Gap, FS=3；To column venturi, FS=2)；rcFor pore radius, μm.
In step s 4, the second valve 2 is opened, after applying setting confining pressure to rock sample using confining pressure pump 13, opens the first valve
Door 1 and third valve 3 record the temperature of a rock sample every setting time when the pressure in measuring device reaches setting pressure
Degree, resistance and T2Spectrum.
In step s 5, when the anhydrous outflow of the pipeline connecting with measurement bottle 15, the second valve 2 and third valve 3 are closed,
And it records rock sample and is under the first water saturation the weight and capillary pressure, rock sample temperature, resistance and T for measuring bottle 152
Spectrum.
Wherein, the gas that the judgement of confining pressure is mainly acquired by second pressure controller 14 is set in step S4 and step S5
Pressure is judged, if the air pressure that second pressure controller 14 acquires reaches setting confining pressure, then closes confining pressure pump 13；Pressure is set
Judgement mainly by first pressure controller 5 acquire air pressure judged, if first pressure controller 5 acquisition air pressure reach
To setting pressure, then high pressure nitrogen storage tank 4 is closed.
In step s 6, the second valve 2 and third valve 3 are opened, continues to apply to set to rock sample using confining pressure pump 13 to enclose
Pressure, and temperature, resistance and the NMR relaxation time of a rock sample are recorded every setting time；
When the anhydrous outflow of the pipeline being connect with measurement bottle 15, the second valve 2 and third valve 3 are closed, is recorded at rock sample
When measuring the weight and capillary pressure, rock sample temperature, resistance and NMR relaxation of bottle 15 under the second water saturation
Between.
The judgement of the anhydrous outflow of pipeline is mainly determined by the signal that pressure acquisition devices 17 acquire, if pressure is adopted
The not output signal of storage 17, then no liquid flows through, and shows the anhydrous outflow of pipeline.
In the step s 7, step S6 is repeated, the weight and hollow billet pressure that measure bottle 15 under third water saturation are obtained
Power, rock sample temperature, resistance and NMR relaxation time close the first valve 1, the second valve 2 and third valve 3 later, take
Rock sample out；
In step s 8, rock sample is calculated separately in the first water saturation, second water saturation and third
Resistivity and pore radius when a water saturation：
rcx=ρ FST2x (6)
Wherein, RtxFor resistivity of the rock sample under x-th water saturation, Ω m；rxContain for rock sample at x-th point
Resistance under water saturation, Ω；TxFor temperature of the rock sample under x-th water saturation；rcxIt is aqueous at x-th point for rock sample
Pore radius under saturation degree；T2xThe nuclear magnetic resonance lateral relaxation time for being rock sample under x-th water saturation；SwpxFor
X-th water saturation of rock sample；Sw0For the initial water saturation of rock sample；mxIt is rock sample in x-th water saturation
Under measurement bottle 15 weight；ρwFor the density of water；VPFor the voidage of rock sample；m'1For the saturation weight of rock sample；m'0For rock sample
Dry weight；
In step s 9, more different rock samples are chosen, step S1 to S3 is repeated, the stratum obtained using different rock samples because
Plain calculation formula and the calculation formula of cementation factor calculate lithology factor a and cementation factor m；
In step slo, according to the resistivity under multiple water saturations of the same rock sample and the water saturation,
Calculate the saturation exponent and lithology factor of rock sample：
Wherein, n is the saturation exponent of rock sample；B is rock sample lithology factor；RI is Resistivity index.
When implementation, this programme is preferably when compact reservoir is gas-bearing reservoir or oil-bearing reservoir, gas saturation or oil-containing
The calculation formula of saturation degree is：
Wherein, SqxFor x-th gas saturation, SyxFor x-th oil saturation.
When implementation, the method for the measurement rock electrical parameters of this programme further includes the capillary pressure and resistivity according to drafting
Curve, calculate resistivity power exponent β：
Wherein, PcxFor the capillary pressure under x-th point of water saturation, MPa；
The method of measurement rock electrical parameters further includes the functional relation constructed between capillary pressure and pore radius：
Wherein, σ is fluid boundary tension；θ is wetting contact angle；
According to the T of record2Spectrum and corresponding resistivity, calculate nuclear-magnetism fit indices nt2：
Wherein, e is natural logrithm.
In conclusion this programme is by capillary pressure electrical property combined measuring instrument and Nuclear Magnetic Resonance 7 to rock sample T2Spectral structure, hollow billet
Pressure and rock sample resistance carry out high-precision, high efficiency, ground easy to operate real-time detection, and pass through the method for measurement rock electrical parameters
Multiple rock electrical parameters of evaluation performances of rock are quickly obtained, so that realizing has compact reservoir hydrocarbon saturation
Effect evaluation.
Claims (5)
1. the compact reservoir rock electrical measurement based on nuclear magnetic resonance, which is characterized in that including capillary pressure electrical property combined measuring instrument, core
Magnetic resonance device and data acquisition control platform；The capillary pressure electrical property combined measuring instrument includes high pressure nitrogen storage tank, confining pressure pump and is used for
The core holding unit of clamping rock sample, the high pressure nitrogen storage tank and confining pressure pump are connect by pipeline with core holding unit one end,
The pipeline of the other end connection of the core holding unit extends in the measurement bottle being placed on weighing device；
The measurement that the core holding unit is placed in the Nuclear Magnetic Resonance is intracavitary, the high pressure nitrogen storage tank and core holding unit
Between pipeline on be provided with the first valve and first pressure controller, on the pipeline between the confining pressure pump and core holding unit
It is provided with the second valve and second pressure controller；Third valve is provided on pipeline between the core holding unit and measurement bottle
Door；
The both ends of the core holding unit pass through an electrode respectively and connect with the LCR digital electric bridge for measuring rock sample resistance,
The first pressure controller, second pressure controller, LCR digital electric bridge, Nuclear Magnetic Resonance and weighing device with the number
It is connected according to acquisition control platform.
2. the compact reservoir rock electrical measurement according to claim 1 based on nuclear magnetic resonance, which is characterized in that the rock
The both ends that the seal chamber of rock core is placed inside heart clamp holder are placed with the hydrophilic partition with two end in contact of rock sample.
3. the compact reservoir rock electrical measurement according to claim 2 based on nuclear magnetic resonance, which is characterized in that the rock
The temperature collecting module connecting with data acquisition control platform is provided on heart clamp holder.
4. the compact reservoir rock electrical measurement according to claim 2 based on nuclear magnetic resonance, which is characterized in that the survey
The pressure acquisition devices connecting with data acquisition control platform are provided between measuring bottle and third valve.
5. the compact reservoir rock electrical measurement according to claim 2 based on nuclear magnetic resonance, which is characterized in that further include
The time controller being connect respectively with Nuclear Magnetic Resonance, LCR digital electric bridge and data acquisition control platform.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827853A (en) * | 2018-05-22 | 2018-11-16 | 西南石油大学 | Compact reservoir rock electrical measurement and measurement method based on nuclear magnetic resonance |
| CN109682850A (en) * | 2018-12-24 | 2019-04-26 | 西南石油大学 | A kind of online imbibition experiment nuclear magnetic resonance test device and experimental method |
| CN109916799A (en) * | 2019-03-22 | 2019-06-21 | 西南石油大学 | Measure the experimental method of the spontaneous Imbibition Relative Permeability of unconventional tight gas reservoir |
| CN110108616A (en) * | 2019-04-24 | 2019-08-09 | 中国地质大学（北京） | Coal sample centrifugal process loss of signal compensation method in a kind of pair of nuclear magnetic resonance experiment |
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2018
- 2018-05-22 CN CN201820762826.5U patent/CN208155804U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827853A (en) * | 2018-05-22 | 2018-11-16 | 西南石油大学 | Compact reservoir rock electrical measurement and measurement method based on nuclear magnetic resonance |
| CN108827853B (en) * | 2018-05-22 | 2024-02-06 | 西南石油大学 | Nuclear magnetic resonance-based tight reservoir rock electric measurement device and measurement method |
| CN109682850A (en) * | 2018-12-24 | 2019-04-26 | 西南石油大学 | A kind of online imbibition experiment nuclear magnetic resonance test device and experimental method |
| CN109916799A (en) * | 2019-03-22 | 2019-06-21 | 西南石油大学 | Measure the experimental method of the spontaneous Imbibition Relative Permeability of unconventional tight gas reservoir |
| CN109916799B (en) * | 2019-03-22 | 2021-04-20 | 西南石油大学 | Experimental method for measuring unconventional dense gas reservoir spontaneous imbibition relative permeability |
| CN110108616A (en) * | 2019-04-24 | 2019-08-09 | 中国地质大学（北京） | Coal sample centrifugal process loss of signal compensation method in a kind of pair of nuclear magnetic resonance experiment |
| CN110108616B (en) * | 2019-04-24 | 2020-09-25 | 中国地质大学（北京） | Method for compensating signal loss of coal sample in centrifugal process in nuclear magnetic resonance experiment |
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