CN105891248A - On-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance - Google Patents
On-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance Download PDFInfo
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- CN105891248A CN105891248A CN201510186120.XA CN201510186120A CN105891248A CN 105891248 A CN105891248 A CN 105891248A CN 201510186120 A CN201510186120 A CN 201510186120A CN 105891248 A CN105891248 A CN 105891248A
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Abstract
The invention relates to an on-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance. The on-line testing device comprises a nuclear magnetic resonance on-line testing module, a rock fluid displacement module (comprising core holder compatible with nuclear magnetic resonance tests) and a computer control and data processing module, a nuclear magnetic resonance testing system and a rock fluid displacement system are combined into a whole through computer control, formation temperature and pressure are simulated, rock displacement tests are carried out under high temperature and high pressure conditions, and real-time nuclear magnetic resonance signals are measured on line to obtain rich rock parameters (porosity, permeability, reservoir forming critical pressure, wettability and the like). The on-line testing device serves as a device for oil gas reservoir forming geological research and oil gas target assessment, and the purposes of analyzing core physical properties and percolation mechanism from micro perspective are achieved.
Description
Technical Field
The invention relates to a device for basin deep low-permeability oil-gas reservoir geological research and oil-gas target evaluation, in particular to a nuclear magnetic resonance on-line testing device for high-temperature and high-pressure rock physical properties and a seepage mechanism.
Technical Field
The Nuclear Magnetic Resonance (NMR) is widely applied to experimental researches of a pore structure of a reservoir, fluid saturation distribution and oil-gas seepage in recent years, the technology can be used for on-line quantitative detection of the pore diameter in a rock core and the fluid distribution by establishing a calibration relation of nuclear magnetic variables and rock-fluid information according to relaxation and diffusion principles of fluid spin nuclear magnetic moments in rock, and has the advantages of rapidness, repeatability, high precision and the like.
However, no equipment for researching a hypotonic reservoir at high temperature and high pressure in a deep layer of a basin is available so far, so that a nuclear magnetic resonance observation method and a nuclear magnetic resonance observation technology suitable for researching a deep layer hypotonic rock structure and a fluid seepage mechanism are developed, dynamic and nondestructive detection of various parameters such as physical properties, fluid properties and saturation of the hypotonic rock is realized, a simulation experiment of oil-gas-water multiphase fluid flow and displacement of various hypotonic media at high temperature and high pressure can be carried out, a dynamic process, influence factors and boundary conditions of oil-gas migration of the deep layer hypotonic reservoir are determined, a quantitative evaluation technology of oil-gas migration and accumulation efficiency of the hypotonic reservoir is gradually formed, the quantitative evaluation technology is effectively applied to oil-gas reservoir distribution prediction of an actual basin, and powerful technical support is provided for exploration and unconventional oil-gas development of the.
At present, experiments related to nuclear magnetic resonance core analysis mostly separate core displacement and nuclear magnetic resonance measurement signals, and few experiments can be used for online observation of distribution, migration and influences of various factors of oil, water and gas.
The invention is based on the existing nuclear magnetic resonance technology, and the distribution and migration of oil, water and gas in a fluid displacement experiment under high temperature and high pressure are observed on line.
Disclosure of Invention
The invention aims to provide a nuclear magnetic resonance online testing device for high-temperature and high-pressure rock physical properties and a seepage mechanism, which can analyze the distribution migration rule of oil, water and gas and the influence of various factors on the oil, water and gas online by using a nuclear magnetic resonance technology under high temperature and high pressure, and analyze the physical properties and the seepage mechanism of a low-permeability reservoir from a microscopic angle.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an online nuclear magnetic resonance testing device for high-temperature and high-pressure rock physical properties and a seepage mechanism mainly comprises a nuclear magnetic resonance measuring system, a displacement system, an annular pressure system, a rock core holder for nuclear magnetic resonance and a computer control and data processing system.
The rock core holder for nuclear magnetic resonance measurement comprises a left adjusting rock core plug, a right adjusting rock core plug, a displacement inlet, a displacement outlet, a left pressing cap, a right pressing cap, a left plug, a right plug, a metal gasket, a polytetrafluoroethylene O-shaped ring, a polytetrafluoroethylene rubber sleeve, an annular pressing cavity, a coil support, a coil, an annular pressing cavity outlet, an annular pressing cavity inlet, a rock core chamber and a barrel body. In consideration of the environment of a nuclear magnetic resonance strong magnetic field, polyether ether ketone (PEEK) resin needs to be selected for a cylinder and the like. The magnetic core holder has the advantages that the magnetic field distribution of the core holder cannot be damaged, the eddy current is small, the quality of a nuclear magnetic resonance measurement signal is guaranteed, the paramagnetic metal material is not placed in the magnetic field and is not safe, the core holder can be normally used in the nuclear magnetic resonance high-intensity magnetic field environment, and meanwhile, the material also guarantees the portability and the pressure bearing of the holder. And the common core holder cannot be measured by a nuclear magnetic resonance diffusion-relaxation two-dimensional spectrum and an imaging method. The PEEK material can work under the conditions of pressure of 30MPa and temperature of 100 ℃, and meets the requirement of low-permeability reservoir nuclear magnetic resonance on-line detection under the deep-layer temperature and pressure conditions.
Aiming at the geological characteristics of a deep hypotonic reservoir, the nuclear magnetic resonance measuring system is improved. Through the comparative study on different magnetic field strengths, it is determined that a better measurement result can be obtained for a deep-layer low-porosity low-permeability rock core when the magnetic field strength of the nuclear magnetic resonance equipment is about 2350 gauss, and therefore a magnet with the magnetic field strength of 2300 gauss is specially designed. The magnetic material of the magnet unit adopts rubidium, iron and boron rare metal, the eddy-current prevention material is an imported silicon steel sheet, the passive shimming of the iron nail and the digital shimming of the coil are carried out, and the magnet adopts a C-shaped open space design, so that the core detection requirement can be met. And a very high gradient coil is needed for measuring the nuclear magnetic resonance diffusion coefficient of the deep low permeability core. To this end, we have developed a gradient coil capable of generating a gradient magnetic field up to 150mT/m with a self-shielding function. Also for different experimental purposes, the system is equipped with two different magnetic field gradient coils, a fixed magnetic field gradient (FFG) and a pulsed magnetic field gradient (PFG).
The displacement system mainly comprises a displacement pump, an insulation can, a displacement pipeline, a non-magnetic valve and a fluid receiving container, and forms a set of nuclear magnetic resonance compatible displacement system. The displacement pump is an isco pump, the pump is a more advanced fluid pump in a displacement research experiment, and can work in various states of constant flow or constant pressure and the like, and meanwhile, the displaced fluid can be oil, water and gas, so that various experimental schemes can be met. The insulation can is used for preheating the displacement fluid and ensuring that the fluid reaches a set temperature when entering the rock core. In order to meet the requirement that the displacement pipeline works under high temperature and high pressure, a stainless steel pipe resistant to high temperature and high pressure is selected. The fluid receiving container is often a laboratory beaker for receiving fluid flowing from a pipe.
The ring pressure system starts from the ring pressure fluid, and if the ring pressure fluid contains hydrogen, the accuracy of nuclear magnetic resonance measurement is influenced, so the invention adopts the hydrogen-free perfluorinated hydrocarbon oil as the ring pressure fluid. The experiment pressure can be controlled through the annular pressure pump, and pressure feedback adjustment is carried out.
The computer control and data processing system mainly comprises pressure and temperature control software and nuclear magnetic resonance measurement software. The pressure and temperature control software is written in LABVIEW language and can control the displacement pump, the valve, the temperature sensor and the heating coil, thereby realizing the online control and recording of the temperature and the pressure. The nuclear magnetic resonance processing software can process a free induction decay signal (FID), a transverse relaxation time spectrum (T2 spectrum), a longitudinal relaxation time spectrum (T1 spectrum) and a diffusion relaxation two-dimensional spectrum (D-T2 spectrum) to obtain parameters such as permeability, porosity and wettability of the rock.
The nuclear magnetic resonance online testing device for the high-temperature high-pressure and seepage mechanism can be used for online experimental research on the seepage mechanism of oil-gas-water multiphase fluid under the high-temperature high-pressure condition.
Drawings
The following drawings are intended to illustrate and explain the present invention without limiting the scope of the invention. Wherein,
FIG. 1 is a schematic structural diagram of an online nuclear magnetic resonance testing device for high-temperature and high-pressure rock physical properties and a seepage mechanism of the invention;
FIG. 2 is an external view of a nuclear magnetic resonance C-shaped magnet, a core holder and a movable support according to the present invention;
fig. 3 is an overall cross-sectional view of a core holder of the present invention.
Detailed Description
The technical features, objects and effects of the present invention will be described in detail with reference to the accompanying drawings
As shown in fig. 1, the online testing device for nuclear magnetic resonance of high temperature, high pressure and seepage mechanism of the invention comprises a ring sub-pump 1, a displacement pump 2, nonmagnetic switches 3, 4 and 5, intermediate containers 6 and 7, pressure gauges 8 and 9, a thermometer 10, a heater 11, a core holder 12, a magnet 13, a metering container 14, a computer control system 15 and a computer data processing system 16.
Fig. 2 is an external view of the nuclear magnetic resonance C-type magnet, the core holder, and the movable bracket, including the slide plate 17, the movable bracket 18, the core holder 12, the magnet 13, the displacement inlet 19, and the displacement outlet 20.
Fig. 3 is an overall cross-sectional view of the core holder. The device comprises a displacement inlet 19, a displacement outlet 20, a left adjusting core plug 21, a right adjusting core plug 22, a left pressing cap 23, a right pressing cap 24, a left plug 25, a right plug 26, a metal gasket 27, a polytetrafluoroethylene O-shaped ring 28, a polytetrafluoroethylene rubber sleeve 29, an annular pressing cavity 30, a coil support 31, a coil 32, an annular pressing cavity outlet 33, an annular pressing cavity inlet 34 and a core chamber 35.
The working process of the nuclear magnetic resonance online test platform for the physical properties and the seepage mechanism of the high-temperature high-pressure rock is as follows:
1) and connecting the pipelines of the testing device, including the pipeline of the displacement system and the pipeline of the confining pressure system. The ring pressure pipe switch 3 and the displacement pipe switch 4 or 5 are opened.
2) And opening the ring pressure gauge 8, the displacement pressure gauge 9 and the core holder thermometer 10 to keep the pressure gauge and the thermometer to work normally.
3) And starting the temperature control 11 of the core holding unit, setting a target temperature, and waiting for the temperature of the system to be stabilized at a set temperature.
4) The rock core is installed, and the rock core holder special for the platform can be adjusted left and right, so that the right adjusting rock core plug 20 can be installed and fixed, then the rock core is adjusted through the left adjusting rock core plug 19, and the rock core is fixed after the rock core holder is adjusted.
5) The core holder was placed in the middle of a magnet capable of generating the main and gradient magnetic fields required for nuclear magnetic resonance, as shown in fig. 2, the main magnet generated a uniform B magnetic field in the middle of the magnet, the gradient disk generated a gradient magnetic field, and the radio frequency coil generated a radio frequency field.
6) And (3) opening the ring pressure pump, enabling ring pressure fluid to flow in from a ring pressure fluid inlet 34, observing a ring pressure gauge 8, and dynamically adjusting the ring pressure according to pressure change so as to control the pressure of the core holder to be at a set pressure.
7) Due to the influence of the ring pressure fluid, the temperature of the system cannot be stable at this time, the feedback adjustment of the temperature control system needs to be waited, and the temperature is adjusted by tracking the temperature, so that the temperature of the system also reaches the corresponding requirement.
8) And after the ring pressure and the temperature requirements are met, starting the displacement pump, flowing liquid or gas into the displacement inlet 19, performing a displacement experiment on the rock core, respectively measuring the volume of the fluid flowing into the displacement inlet 19 and the volume of the fluid flowing out of the displacement outlet 20, and measuring the displacement liquid.
9) During the displacement experiment, the control system 15 is used for carrying out on-line test and recording on the temperature, the pressure and the nuclear magnetic resonance signals, and the computer system 16 is used for generating a corresponding recording table and nuclear magnetic measurement data.
10) After the experiment is finished, allowing the perfluorinated hydrocarbon oil in the annular pressure cavity to flow out of a part of the perfluorinated hydrocarbon oil through the annular pressure fluid outlet 33, reducing the pressure applied to the polytetrafluoroethylene rubber sleeve 29, taking out the rock core, and finishing the experiment platform for the next experiment.
The invention relates to a nuclear magnetic resonance online testing device for high-temperature high-pressure low-permeability physical properties and a seepage mechanism, which can simulate the pressure and the temperature of a rock core under a stratum condition and carry out online analysis on the rock core through a special compatible nuclear magnetic resonance rock core holder.
Claims (8)
1. An online testing device for nuclear magnetic resonance of high-temperature and high-pressure rock physical properties and a seepage mechanism. The experimental device is suitable for researching deep rock structures and fluid seepage mechanisms, dynamic and nondestructive detection of various parameters such as rock physical properties, fluid properties, saturation and the like is realized, simulation experiments of oil-gas-water multiphase fluid flow and displacement under high temperature and high pressure can be carried out, and dynamic processes, influence factors and critical conditions of deep reservoir oil-gas migration are researched. Based on the existing nuclear magnetic resonance technology, the distribution state and migration rule of oil, water and gas in a fluid displacement experiment at high temperature and high pressure are dynamically observed on line.
2. According to the method of claim 1, the nuclear magnetic resonance technology is used for dynamically observing the distribution state and migration rule of oil, water and gas in the fluid displacement experiment at high temperature and high pressure on line.
3. According to the claim 1, a nuclear magnetic resonance compatible probe capable of carrying out core detection at high temperature and high pressure is developed, and the nuclear magnetic resonance compatible probe can bear the high temperature and high pressure and reduce the influence of eddy current.
4. According to the claim 1, the magnet for core detection adopts a C-shaped open space design, has a large measurement space, and can accommodate a magnetic resonance probe and a displacement flow system.
5. According to claim 1, a flow system with nmr compatibility comprising a non-magnetic conduit, a non-magnetic valve, and a non-magnetic core holder.
6. According to claim 1, a dedicated computer automatic control module, written in LABVIEW language, combines the NMR measurement module with the rock fluid displacement module to achieve online dynamic MR measurements.
7. According to claim 1, dedicated data processing software can process transverse relaxation time spectra (T2 spectra), longitudinal relaxation time spectra (T1 spectra) and diffusion relaxation two-dimensional spectra (D-T2 spectra) and provide corresponding petrophysical parameters (porosity, permeability, wettability, etc.).
8. According to claim 1, two different magnetic field gradients can be used, a fixed magnetic field gradient (FFG) and a pulsed magnetic field gradient (PFG).
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| CN201510186120.XA CN105891248A (en) | 2015-04-17 | 2015-04-17 | On-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance |
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| CN201510186120.XA CN105891248A (en) | 2015-04-17 | 2015-04-17 | On-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance |
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| CN105158287A (en) * | 2015-07-08 | 2015-12-16 | 上海大学 | Visualization evaluation method of transportation property of gel in rock micro-channel |
| CN106353357A (en) * | 2016-11-08 | 2017-01-25 | 西安理工大学 | Device and method for monitoring micro structure changes of sand soil medium under seepage effect |
| CN106483057A (en) * | 2016-09-30 | 2017-03-08 | 西安石油大学 | A kind of method of quantitative assessment ultra-deep reservoir movable fluid and its application |
| CN106525889A (en) * | 2016-11-03 | 2017-03-22 | 中国科学院力学研究所 | Experiment device and method for simulating hole diameter variations in tight oil depletion development process |
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