CN103926184A - Detection method for gas logging porosity of core and detection device thereof - Google Patents
Detection method for gas logging porosity of core and detection device thereof Download PDFInfo
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Abstract
The invention discloses a detection method for gas logging porosity of a core and a detection device of the detection method, and aims at improving the test accuracy. The method disclosed by the invention comprises the following steps: drilling out the core; exerting confining pressure; recording pressure data at the other end of the core by a controller; calculating to obtain the porosity of the core. By adopting the device disclosed by the invention, an outlet of a gas source tank is connected with one end of a core clamper through a gas source input duct; the core clamper is arranged inside a sealed pressure container; the pressure container is connected with a hydraulic pump through a pressure container pipeline; the other end of the core clamper is connected with a reflux pipe connected with the gas source input duct. Compared with the prior art, the confining pressure is exerted to the core; the controller records the pressure data at the other end of the core; the porosity of the core is calculated. The gas source, the pressure container, the hydraulic pump and the core clamper inside the pressure container form the device for detecting the porosity of the core, the cost is low, and the test accuracy is improved.
Description
Technical field
The present invention relates to detection method and the pick-up unit thereof of core porosity under a kind of core analysis method and device thereof, particularly a kind of high-temperature high-pressure state.
Background technology
Rock porosity is the call parameter of the calculating of hydrocarbon storage amount, field geophysics well logging interpretation, reservoir quality evaluation and Oilfield Development Engineering design.Other basic parameter of rock core relatively, porosity measurement method is more, for example: weight method, Boyle's law method, fluid summation method, thin slice pock method and image analytical method etc.But in existing method, majority belongs to conventional method, test condition is that ground is normal temperature (room temperature) and normal pressure (0.1-2MPa), and influence factor is many.How to improve the objective of the struggle that measuring accuracy and automaticity are domestic and international petrophysics and core analysis technical field always.
Under High Temperature High Pressure, the development situation of rock core gas survey porosity method and instrument is made slow progress both at home and abroad.Early-stage Study is more focused on the hardware development of instrument, has at present the full-automatic core test system of CMS-300 of American core company abroad, and domestic have a High Temperature High Pressure factor of porosity Auto-Test System (being called for short CPM system).
For the research of test philosophy, at present, the test philosophy of surveying core porosity instrument with confined pressure gas is all that the volume that enters rock core by calculating gas obtains, and the volume of gas calculates by state equation.But in fact, under band confined pressure state, the pressure distribution gradient of rock core inside, especially to compact rock core, gradient distributes more obvious, so the temperature, pressure in test process on core sample cannot Measurement accuracy.
Summary of the invention
The object of this invention is to provide a kind of rock core gas and survey factor of porosity detection method and pick-up unit thereof, the technical matters that solve is to improve the precision of test.
The present invention is by the following technical solutions: a kind of rock core gas is surveyed factor of porosity detection method, comprises the following steps:
One, place rock core, in the prospecting borehole of needs exploration, put into coring tool, drill through out rock sample, i.e. rock core, puts into core holding unit by rock core;
Two, rock core is applied to confined pressure, the rock core reservoir pressure of living in drilling through out described in pressure boosts to from an atmospheric pressure, keep at least 10 minutes, before applying confined pressure, the rock core formation temperature of living in drilling through out described in use silicone oil is heated to rock core, insulation to experiment finishes, cooling naturally after discharge high-temperature silicon oil;
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, stable source of the gas is the nitrogen of purity 99.99%, maintaining pressure is 0.1MPa, keeps during this time confined pressure constant, another termination pressure gauge of core holding unit;
Four, controller records rock core other end pressure data;
Five, controller calculates core porosity φ according to following formula, and its computing formula is as follows:
In formula, P is the pressure of rock core end, and the tensimeter accommodating between device and controller by rock core of the present invention records, and unit is: MPa; X is the length of rock core, and unit is: m; μ is viscosity, and unit is: mPas; C is total compressibility, 1/MPa; K is permeability, and unit is: md; T is that temperature and pressure start timing while all meeting with the residing formation temperature of testing rock core and pressure until the time that test finishes, and unit is: s.
According to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification ", sampling obtains rock sample of the present invention.
The degree of depth that drills through of the present invention is 0～5000m.
The diameter of rock sample of the present invention is 1in, height 2in.
The gas that is filled with using while applying confined pressure of the present invention is that purity is 99.99% nitrogen.
A kind of rock core gas is surveyed factor of porosity pick-up unit, be provided with source of the gas tank, on source of the gas tank, be connected with source of the gas pressure tank meter, the outlet of source of the gas tank connects one end of core holding unit through source of the gas input channel, core holding unit is arranged in the pressure vessel of sealing, source of the gas input channel is connected with core holding unit one end through pressure vessel, described pressure vessel is through pressure vessel conduit connecting fluid press pump, be connected with the recirculatory pipe being connected with source of the gas input channel at the other end of core holding unit, recirculatory pipe is provided with controller, at the two ends of described core holding unit, on source of the gas input channel and recirculatory pipe, be respectively equipped with pressure gauge, recirculatory pipe between pressure gauge and the controller of recirculatory pipe is provided with flowmeter, controller respectively with source of the gas tank on source of the gas pressure tank meter, the pressure gauge at core holding unit two ends is connected with hydraulic pump.
The junction of junction, pressure vessel and the pressure vessel conduit of hydraulic pump of the present invention and pressure vessel conduit and the outer tube wall of source of the gas input channel and the contact position of pressure vessel are provided with O-ring seal.
What in pressure vessel of the present invention, be filled with is that purity is 99.99% nitrogen for applying the gas of confined pressure.
The present invention compared with prior art, rock core is applied to confined pressure, controller records rock core other end pressure data, calculate core porosity, core holding unit in employing source of the gas, pressure vessel, hydraulic pump, pressure vessel is configured for detecting the device of core porosity, and equipment cost is low, obtains the gaseous tension at rock core two ends from pick-up unit, calculate core porosity by the gas flow differential equation, improved the precision of test.
Brief description of the drawings
Fig. 1 is the structural representation that rock core gas of the present invention is surveyed factor of porosity pick-up unit.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Rock core gas of the present invention is surveyed factor of porosity detection method, comprises the following steps:
One, place rock core, according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification ", in the prospecting borehole of needs exploration, put into coring tool, drill through out rock sample, it is rock core, drilling through the degree of depth is 0～5000m, and the diameter of rock sample is 1in, height 2in, and rock core is put into core holding unit; Described coring tool is coring crown, and for example model is Rmb-8100, and core holding unit is the core holding unit that rock core gas of the present invention is surveyed factor of porosity detection method device; Drill through degree of depth rice using relative height above sea level as reference;
Two, rock core is applied to confined pressure, pressure boosts to the rock core drilling through out reservoir pressure of living in from an atmospheric pressure, keep at least 10 minutes, do not limit pressure rising time, applying the gas that is filled with that confined pressure uses is that purity is 99.99% nitrogen, before applying confined pressure, the rock core formation temperature of living in that uses high temperature resistant silicone oil that rock core is heated to drill through out, insulation to experiment finishes, after discharging high temperature resistant silicone oil, naturally lower the temperature, described firing equipment is the well heater of prior art, and the heat time is no less than nature temperature fall time;
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, described stable source of the gas is the nitrogen of purity 99.99%, and maintaining rock core end force is 0.1MPa, during described maintenance at least 10 minutes, keep confined pressure constant, another termination pressure gauge of core holding unit;
Four, controller records rock core other end pressure data;
Five, controller, according to the gas flow differential equation, calculates core porosity φ, and (" gas reservoir engineering analytical approach " the 35th page, yellow bright light etc. are write, petroleum industry publishing house, on Dec 1st, 2004), its computing formula is as follows:
In formula (1), P is the pressure of rock core end, and the tensimeter accommodating between device and controller by rock core of the present invention records, and unit is: MPa; X is the length of rock core, gets the height 2in of rock sample, and unit is: m; μ is the viscosity of rock core, is the viscosity of nitrogen gas, directly provides gas viscosity by bought nitrogen source of the gas manufacturer, and unit is: mPas; C is total compressibility, measures by experiment or inquiry pertinent literature obtains, and the total compressibility that this place is nitrogen gas, directly provides gas integrated compressibility coefficient by bought nitrogen source of the gas manufacturer, is 1/MPa; K is permeability, and with darcy experiment test (" SY/T5336-2006 core analysis method " the 6th chapter measures permeability), unit is: md; T is that temperature and pressure starts timing while all meeting with the residing formation temperature of tested rock core and pressure until the time that test finishes, and unit is: s.
Utilize formula (1), calculate factor of porosity φ.
In permeation fluid mechanics, the application of seepage flow equation need to be experienced several intermediate links, and each link all can produce certain error, and link is fewer, and error is just less.And the inventive method by experiment phenomenon in conjunction with the accurate inverted porosity value of mathematical formulae, reach being identical between measured value and practical application value, cut down the number of intermediate links.The median error of having avoided simple physical test method to produce.
As shown in Figure 1, rock core gas of the present invention is surveyed factor of porosity pick-up unit, be provided with source of the gas tank 1, source of the gas tank 1 is mounted with source of the gas, be connected with source of the gas pressure tank meter, the outlet of source of the gas tank 1 is connected with one end of core holding unit 4 through source of the gas input channel 8, core holding unit 4 is arranged in the pressure vessel 3 of sealing, pressure in pressure vessel 3 is the confined pressure being applied on rock core, source of the gas input channel 8 is connected with core holding unit 4 through pressure vessel 3, pressure vessel 3 is connected with hydraulic pump 2 through pressure vessel conduit 9, described hydraulic pump 2 pressurizes to pressure vessel 3, the junction of hydraulic pump 2 and pressure vessel conduit 9, pressure vessel 3 is provided with O-ring seal with the contact position of the junction of pressure vessel conduit 9 and the outer tube wall of source of the gas input channel 8 and pressure vessel 3, be provided with the recirculatory pipe 10 being connected with source of the gas input channel 8 at the other end of core holding unit 4, on recirculatory pipe 10, be provided with controller 7, at the two ends of described core holding unit 4, on source of the gas input channel 8 and recirculatory pipe 10, be respectively equipped with pressure gauge 5, recirculatory pipe 10 between pressure gauge 5 and controller 7 on recirculatory pipe 10 is provided with flowmeter 6.
Controller 7 is connected with hydraulic pump 2 with the pressure gauge 5 at source of the gas pressure tank meter, core holding unit 4 two ends respectively, if there is fluctuation in each pressure, controller 7 automatic boostings or step-down, maintain pressure stability, what in described pressure vessel 3, be filled with is that purity is 99.99% nitrogen for applying the gas of confined pressure.
Described core holding unit adopts the core holding unit with confined pressure, and confined pressure is 1-70MPa; In the present embodiment, core holding unit adopts TY-4A type High Temperature High Pressure core holding unit that Hai'an, Jiangsu oil Instrument Ltd. produces; The EXPZCB-700A type hydraulic pump that hydraulic pump adopts Yiwu developing Hardwear Pty Ltd. to produce; Pressure gauge adopts the radially shatter-proof UHV (ultra-high voltage) tensimeter of 0-200MPA of 100MM of the YN-100 type of Shanghai Ke Di instrument company limited production; The DN20 gas meter that flowmeter adopts AudioCodes instrument company limited of Jinhu County to produce; The concrete size of pressure vessel: diameter 100mm, height 200mm; Described controller 7 adopts the digital servo pressure controller of prior art, for example Shanghai instrument and meter for automation factory, YTK02E type digital servo pressure controller.
For checking the method measuring accuracy, adopt standard rock core SY/T6294-1997, utilize mercury intrusion method to carry out factor of porosity test;
Embodiment 1:
One, place rock core 1, be 2399.56 meters of positions according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification " by the degree of depth of the prospecting borehole in needs exploration, in well, put into coring tool, drill through out rock sample, the diameter of rock sample is 1in, height 2in, be rock core 1, put into core holding unit;
Two, rock core is applied to confined pressure, the pressure on the rock core stratum of living in drilling through out described in the peripheral pressure of rock core 1 is boosted to from an atmospheric pressure, keep 10 minutes, the described confined pressure that applies makes the used nitrogen that gas is 99.99% for purity that is filled with, before applying confined pressure, the rock core formation temperature of living in that uses high temperature resistant silicone oil to drill through out described in rock core 1 is heated to, calculate by underground temperature gradient, the underground temperature gradient of this area is 3 DEG C/100m, concrete formula is as follows: 26+2399.56/100*3=97.98 DEG C, keep temperature to experiment to finish, after discharging high-temperature silicon oil, naturally lower the temperature, described firing equipment is the western fluorine well heater of TGPTFE type of the good storage matter of Taizhou City company limited,
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, described stable source of the gas is the nitrogen of purity 99.99%; Maintain pressure 0.1MPa; Keep during this time confined pressure constant, another termination pressure gauge of core holding unit; The pressure of stablizing source of the gas remains on 0.1MPa;
Four, controller records rock core other end pressure data;
Five, controller will, according to formula (1), calculate core porosity φ:
In formula (1), P is 0.1MPa; X is 2in; μ is 17.58mPas; C is total compressibility, is 0.9999,1/MPa; K is permeability, is 129.54md; T is 8.08S.
Utilize formula (1), calculating factor of porosity φ is 25.42%.
Embodiment 2
One, place rock core 2, be 2400m position according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification " by the degree of depth of the prospecting borehole in needs exploration, in well, put into coring tool, drill through out rock sample, the diameter of rock sample is 1in, height 2in, be rock core 2, put into core holding unit;
Two, rock core is applied to confined pressure, the pressure on the rock core stratum of living in drilling through out described in the peripheral pressure of rock core 2 is boosted to from an atmospheric pressure, keep 10 minutes, the described confined pressure that applies makes the used nitrogen that gas is 99.99% for purity that is filled with, before applying confined pressure, the rock core formation temperature of living in that uses high temperature resistant silicone oil to drill through out described in rock core 2 is heated to, calculate by underground temperature gradient, the underground temperature gradient of this area is 3 DEG C/100m, concrete formula is as follows: 26+2400/100*3=98 DEG C, keep temperature to experiment to finish, after discharging high-temperature silicon oil, naturally lower the temperature, described firing equipment is the western fluorine well heater of TGPTFE type of the good storage matter of well heater Taizhou City company limited,
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, described stable source of the gas is the nitrogen of purity 99.99%; Maintain pressure 0.1MPa; Keep during this time confined pressure constant, another termination pressure gauge of core holding unit; The pressure of stablizing source of the gas remains on 0.1MPa;
Four, controller records rock core other end pressure data;
Five, controller will, according to formula (1), calculate core porosity φ:
In formula (1), P is 0.1MPa; X is 2in; μ is 17.58mPas; C is total compressibility, is 0.9999,1/MPa; K is permeability, is 81.81md; T is 13.15s.
Utilize formula (1), calculating factor of porosity φ is 17.18%.
Embodiment 3
One, place rock core 3, be 2400m position according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification " by the degree of depth of the prospecting borehole in needs exploration, in well, put into coring tool, drill through out rock sample, the diameter of rock sample is 1in, height 2in, be rock core 3, put into core holding unit;
Two, rock core is applied to confined pressure, the pressure on the rock core stratum of living in drilling through out described in the peripheral pressure of rock core 3 is boosted to from an atmospheric pressure, keep 10 minutes, the described confined pressure that applies makes the used nitrogen that gas is 99.99% for purity that is filled with, before applying confined pressure, the rock core formation temperature of living in that uses high temperature resistant silicone oil to drill through out described in rock core 3 is heated to, calculate by underground temperature gradient, the underground temperature gradient of this area is 3 DEG C/100m, concrete formula is as follows: 26+2400/100*3=98 DEG C, keep temperature to experiment to finish, after discharging high-temperature silicon oil, naturally lower the temperature, described firing equipment is the western fluorine well heater of TGPTFE type of the good storage matter of well heater Taizhou City company limited,
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, described stable source of the gas is the nitrogen of purity 99.99%; Maintain pressure 0.1MPa; Keep during this time confined pressure constant, another termination pressure gauge of core holding unit; The pressure of stablizing source of the gas remains on 0.1MPa;
Four, controller records rock core other end pressure data;
Five, controller will, according to formula (1), calculate core porosity φ:
In formula (1), P is 0.1MPa; X is 2in; μ is 17.58mPas; C is total compressibility, is 0.9999,1/MPa; K is permeability, is 86.84md; T is 12.55s.
Utilize formula (1), calculating factor of porosity φ is 18.20%.
Embodiment 4
One, place rock core 1, be 2399.56 meters of positions according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification " by the degree of depth of the prospecting borehole in needs exploration, in well, put into coring tool, drill through out rock sample, the diameter of rock sample is 1in, height 2in, be rock core 4, put into core holding unit;
Two, rock core is applied to confined pressure, the pressure on the rock core stratum of living in drilling through out described in the peripheral pressure of rock core 4 is boosted to from an atmospheric pressure, keep 10 minutes, the described confined pressure that applies makes the used nitrogen that gas is 99.99% for purity that is filled with, before applying confined pressure, the rock core formation temperature of living in that uses high temperature resistant silicone oil to drill through out described in rock core 4 is heated to calculates by underground temperature gradient, the underground temperature gradient of this area is 3 DEG C/100m, concrete formula is as follows: 26+2399.56/100*3=97.98 DEG C, keep temperature to experiment to finish, after discharging high-temperature silicon oil, naturally lower the temperature, described firing equipment is the western fluorine well heater of TGPTFE type of the good storage matter of well heater Taizhou City company limited,
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, described stable source of the gas is the nitrogen of purity 99.99%; Maintain pressure 0.1MPa; Keep during this time confined pressure constant, another termination pressure gauge of core holding unit; The pressure of stablizing source of the gas remains on 0.1MPa;
Four, controller records rock core other end pressure data;
Five, controller will, according to formula (1), calculate core porosity φ:
In formula (1), P is 0.1MPa; X is 2in; μ is 17.58mPas; C is total compressibility, is 0.9999,1/MPa; K is permeability, is 124.46md; T is the 8.58s time.
Utilize formula (1), calculating factor of porosity φ is 24.41%.
Embodiment 5
One, place rock core 5, be 2400m position according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification " by the degree of depth of the prospecting borehole in needs exploration, in well, put into coring tool, drill through out rock sample, the diameter of rock sample is 1in, height 2in, be rock core 5, put into core holding unit;
Two, rock core is applied to confined pressure, the pressure on the rock core stratum of living in drilling through out described in the peripheral pressure of rock core 5 is boosted to from an atmospheric pressure, keep 10 minutes, the described confined pressure that applies makes the used nitrogen that gas is 99.99% for purity that is filled with, before applying confined pressure, the rock core formation temperature of living in that uses high temperature resistant silicone oil to drill through out described in rock core 5 is heated to, calculate by underground temperature gradient, the underground temperature gradient of this area is 3 DEG C/100m, concrete formula is as follows: 26+2400/100*3=98 DEG C, keep temperature to experiment to finish, after discharging high-temperature silicon oil, naturally lower the temperature, described firing equipment is the western fluorine well heater of TGPTFE type of the good storage matter of well heater Taizhou City company limited,
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, described stable source of the gas is the nitrogen of purity 99.99%; Maintain pressure 0.1MPa; Keep during this time confined pressure constant, another termination pressure gauge of core holding unit; The pressure of stablizing source of the gas remains on 0.1MPa;
Four, controller records rock core other end pressure data;
Five, controller will, according to formula (1), calculate core porosity φ:
In formula (1), P is 0.1MPa; X is 2in; μ is 17.58mPas; C is total compressibility, is 0.9999,1/MPa; K is permeability, is 81.86md; T is the 12.22s time.
Utilize formula (1), calculating factor of porosity φ is 17.42%.
Testing result and standard value are contrasted, and result is as shown in showing down.
| Rock core sequence number | Mercury intrusion method test result (unit: %) | Gas is surveyed result (unit: %) | Error (unit: %) |
| 1 | 25.37 | 25.42 | 0.05 |
| 2 | 17.29 | 17.18 | 0.11 |
| 3 | 18.41 | 18.20 | 0.21 |
| 4 | 24.27 | 24.41 | 0.14 |
| 5 | 17.60 | 17.42 | 0.18 |
The result that the present invention obtains by above-mentioned detection method shows, measured factor of porosity error is less than 0.5pu, within 0.3pu, therefore, adopt this detection method and pick-up unit not only can greatly carry highly porous measuring accuracy, and for the further investigation of petrophysical property be In Oil Field Exploration And Development, provide true and reliable basic parameter, have more important theory value and meaning.
Claims (8)
1. rock core gas is surveyed a factor of porosity detection method, comprises the following steps:
One, place rock core, in the prospecting borehole of needs exploration, put into coring tool, drill through out rock sample, i.e. rock core, puts into core holding unit by rock core;
Two, rock core is applied to confined pressure, the rock core reservoir pressure of living in drilling through out described in pressure boosts to from an atmospheric pressure, keep at least 10 minutes, before applying confined pressure, the rock core formation temperature of living in drilling through out described in use silicone oil is heated to rock core, insulation to experiment finishes, cooling naturally after discharge high-temperature silicon oil;
Three, at above-mentioned confined pressure and temperature, pass into stable source of the gas in one end of core holding unit, stable source of the gas is the nitrogen of purity 99.99%, maintaining pressure is 0.1MPa, keeps during this time confined pressure constant, another termination pressure gauge of core holding unit;
Four, controller records rock core other end pressure data;
Five, controller calculates core porosity φ according to following formula, and its computing formula is as follows:
In formula, P is the pressure of rock core end, and the tensimeter accommodating between device and controller by rock core of the present invention records, and unit is: MPa; X is the length of rock core, and unit is: m; μ is viscosity, and unit is: mPas; C is total compressibility, 1/MPa; K is permeability, and unit is: md; T is that temperature and pressure start timing while all meeting with the residing formation temperature of testing rock core and pressure until the time that test finishes, and unit is: s.
2. rock core gas according to claim 1 is surveyed porosity method, it is characterized in that: according to SY/T6294-1997 " oil gas prospect pit analytic sample spot sampling specification ", sampling obtains described rock sample.
3. rock core gas according to claim 2 is surveyed porosity method, it is characterized in that: described in to drill through the degree of depth be 0～5000m.
4. rock core gas according to claim 3 is surveyed porosity method, it is characterized in that: the diameter of described rock sample is 1in, height 2in.
5. rock core gas according to claim 4 is surveyed porosity method, it is characterized in that: described in the gas that is filled with that uses while applying confined pressure be that purity is 99.99% nitrogen.
6. a rock core gas is surveyed factor of porosity pick-up unit, it is characterized in that: described rock core gas is surveyed factor of porosity pick-up unit and is provided with source of the gas tank (1), on source of the gas tank (1), be connected with source of the gas pressure tank meter, the outlet of source of the gas tank (1) connects one end of core holding unit (4) through source of the gas input channel (8), core holding unit (4) is arranged in the pressure vessel (3) of sealing, source of the gas input channel (8) is connected with core holding unit (4) one end through pressure vessel (3), described pressure vessel (3) is through pressure vessel conduit (9) connecting fluid press pump (2), be connected with the recirculatory pipe (10) being connected with source of the gas input channel (8) at the other end of core holding unit (4), recirculatory pipe (10) is provided with controller (7), at the two ends of described core holding unit (4), on source of the gas input channel (8) and recirculatory pipe (10), be respectively equipped with pressure gauge (5), recirculatory pipe (10) between pressure gauge (5) and the controller (7) of recirculatory pipe (10) is provided with flowmeter (6), controller (7) respectively with source of the gas tank (1) on source of the gas pressure tank meter, the pressure gauge (5) at core holding unit (4) two ends is connected with hydraulic pump (2).
7. rock core gas according to claim 6 is surveyed factor of porosity pick-up unit, it is characterized in that: described hydraulic pump (2) is provided with O-ring seal with junction, the pressure vessel (3) of pressure vessel conduit (9) with the contact position of the junction of pressure vessel conduit (9) and the outer tube wall of source of the gas input channel (8) and pressure vessel (3).
8. rock core gas according to claim 6 is surveyed factor of porosity pick-up unit, it is characterized in that: what in described pressure vessel (3), be filled with is that purity is 99.99% nitrogen for applying the gas of confined pressure.
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| CN109738296A (en) * | 2019-03-01 | 2019-05-10 | 中国石油大学(北京) | Wellbore aquation caving pressure test device and method |
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