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    • 专利摘要:
    CONTAINING CONTAINER OF RECIRCULATION APPLIANCE, AND METHOD FOR FLOODING A CORE THROUGH CONSTANT CONTRAPRESSION RECIRCULATION BY A FLUID. An apparatus and method for simulating production conditions in a hydrocarbon-carrying reservoir, as an example, are described. Full recirculation flow measurements allow multiple fluids (eg, crude oil, brine, and gas) to be injected simultaneously into core samples that have varying dimensions. Stable and accurate backpressures are maintained at total flow rates as high as 200 cm (3) / min, over a wide range of fluid viscosities. Stable and accurate network overload pressures related to pore pressure are also maintained, thus simulating depth formations. Core samples from formations can also be investigated using the apparatus and their method, for potential carbon dioxide sequestration, as another example.
    公开号:BR112013014867B1
    申请号:R112013014867-5
    申请日:2011-12-13
    公开日:2021-01-19
    发明作者:Mohammad Piri
    申请人:University Of Wyoming；
    IPC主号:
    专利说明:

    CROSS REFERENCE TO RELATED REQUESTS
    [0001] This application claims the benefit of United States Provisional Patent Application Number 61 / 422,636 for “RECIRCULATING, CONSTANT BACKPRESSURE CORE FLOODING APPARATUS AND METHOD” by Mohammad Piri, which was filed on December 13, 2010, all content of which it is incorporated here specifically by reference to everything it disseminates and teaches. FIELD OF THE INVENTION
    [0002] The present invention in general relates to an apparatus and a method for characterizing porous materials and, more particularly, the determination of residual saturation and single-phase and multi-phase flow properties such as relative permeabilities, as examples of samples nucleus from reservoirs that support hydrocarbons and other underground formations. BACKGROUND OF THE INVENTION
    [0003] Permeability is a measure of the ability of fluids to pass through porous media, and is inversely proportional to the flow resistance presented by the medium. When a single fluid saturates the pore space of a medium, the measured permeability is known as absolute permeability. For saturations of less than 100%, the measured permeability is called effective permeability. Relative permeability is the ratio of effective permeability for a particular fluid at a given saturation to a selected permeability, and can be determined from pressure and fluid saturation measurements. Core flood measurements to determine material permeability for various fluids as a function of temperature and pressure were performed using computed tomography (CT) technology. The shape of the fluid fronts can also be monitored when a fluid is driven through a core sample. The images of the nuclei before and after the flood are subtracted to render the frontal fluid interior to the nucleus, without disturbing the sample. Fluid saturation can be measured using X-ray attenuation. SUMMARY OF THE INVENTION
    [0004] Modalities of the present invention overcome the disadvantages and limitations of the prior art by providing an apparatus and method for flooding porous cores with fluids.
    [0005] Another objective of the modalities of the invention is to provide an apparatus and a method for flooding the porous nuclei with fluids under constant back pressure.
    [0006] Another objective of the modalities of the invention is to provide a device to provide an apparatus and method for flooding porous nuclei with fluids with complete recirculation.
    [0007] Objectives, advantages and additional new features of the invention will be defined in the description which follows, and in part will be apparent to those skilled in the art through examining the sequence or can be learned by practicing the invention. The objectives and advantages of the invention can be realized and achieved through the instrumentalities and combinations pointed out particularly in the attached claims.
    [0008] To achieve the foregoing and other purposes, and in accordance with the purposes of the present invention, as incorporated and widely described here, the constant pressure recirculating apparatus for flooding a core with at least one fluid selected from this instrument includes : a core support for containing the core and having a longitudinal axis, an inlet port for introducing at least one fluid in contact with the core, an outlet port, and an orifice for applying a selected pressure to an outer surface of the core; an overloaded pressure pump in fluid connection with the pressure port of the core support; at least one fluid pump for pumping at least one selected fluid in fluid communication with the inlet port of the core support; a separator for separating at least one fluid from at least one fluid pump by density thereof from other fluids leaving the core support after passing through the core, the separator having a first bottom orifice, a second bottom orifice, and at least one fluid return port for returning fluid to the at least one pump; a back pressure pump in fluid communication with the outlet port of the core support to maintain a selected back pressure in the outlet port of the core support, and in fluid communication with the first bottom port of the separator to transfer at least one fluid that exits said core support to the separator; and a pressure compensation pump in fluid communication with the second bottom orifice of the separator to prevent a change in pressure when at least one fluid is transferred to the separator by the back pressure pump.
    [0009] In another aspect of the invention and according to its objectives and purposes, the method for flooding a core by recirculation in constant counter pressure in at least one fluid selected through said core, in this document, includes the steps of: pumping the hair at least one fluid through a core in a core support that has a longitudinal axis, using at least one fluid pump; pressurize the outer surface of the core for a given pressure; separate the at least one fluid by density from the other fluids leaving the core support after passing through the core, in a separator returning at least one fluid to at least one pump, after the step of separating the hair least one fluid; maintain a selected back pressure for at least one fluid exiting the core support; and removing fluid from or adding fluid to the separator to prevent an increase or decrease in back pressure, respectively, in the step of separating at least one fluid.
    [0010] Benefits and advantages of modalities of the present invention include, but are not limited to, providing a core flooding apparatus which allows all fluids to be recirculated in a wide range of flow rates, while a stable and accurate back pressure is maintained , thus creating a more stable balance between the phases through the device, and minimizing the need for additional fluids. Accurate regulation of back pressure also leads to more reliable fluid displacements in the core sample, which in turn leads to more accurate measurements of single-phase or multi-phase flow properties (from which the relative permeabilities derive). In addition, the pressure and temperature ranges that create miscible or partially miscible fluids and generate unintended saturation variations in the core are reduced, thus minimizing uncertainties introduced in the measurement of residual saturation during flow experiments. BRIEF DESCRIPTION OF THE DRAWINGS
    [0011] The attached drawings, which are incorporated into or form a part of the specification, illustrated modalities of the present invention and, together with the description serve to explain the principles of the invention.
    [0012] Figure 1 is a schematic diagram of a device modality for flooding core samples, while maintaining constant back pressure and recirculating all fluids.
    [0013] Figure 2 is a schematic representation of a side view of a computed tomography (CT) scanner and vertical positioning system to locate a nucleus in the scanner, thus allowing measurements of saturation in situ under the conditions of flow are carried out.
    [0014] Figure 3 is a graph of the back pressure (MPa) as a function of time (min.) For two cores investigated. DETAILED DESCRIPTION OF THE INVENTION
    [0015] Briefly, modalities of the present invention include an apparatus and method for simulating production conditions in reservoirs that carry hydrocarbons, as an example, by flooding core samples from such reservoirs, are described. Full recirculation flow experiments allow multiple fluids (for example, crude oil, brine, and gas) to be injected simultaneously into core samples that have varying dimensions. Stable and accurate backpressures are maintained at total flow rates as high as 200 cm3 / min, over a wide range of fluid viscosities. Stable and accurate network overload pressures related to pore pressure are also maintained, thus simulating depth formations. Core samples from formations can also be investigated using the apparatus and their method, as an example, for possibilities of carbon dioxide sequestration. Cores are generally cylindrical in shape.
    [0016] Said gaseous fluid can be selected from carbon dioxide, nitrogen, methane, sulfur dioxide and nitrogen dioxide and mixtures thereof.
    [0017] Three, double cylinder injection pumps were used to simultaneously inject three fluids into the core sample in a constant flow mode in pair.
    [0018] The fluids produced from the core sample are received by a double cylinder back pressure regulating pump in a constant flow mode in pair, thus maintaining a stable and accurate back pressure and generating a stable contact pressure limit condition at the exit of the core sample. Produced fluids are then injected into a separator which can simultaneously accept up to three fluids, the lightest fluid that resides at the top, the heaviest fluid at the bottom, and the third fluid in the middle. Injection pumps draw fluids for reinjection into the core sample from appropriate locations on the separator. That is, pumps that inject fluids into the core retract fluids from the separator.
    [0019] The injection of fluids in the separator via the receiving pump, and the withdrawal of fluids by the injection pumps can, in principle, lead to large variations in the pressure of the separator, particularly at high flow rates or when the volume of the separator is relatively small. smaller. This in turn can affect the balance between the phases in the separator, particularly in flow experiments where pressure and temperature conditions create miscible or partially miscible conditions, and generate unintended saturation variations in the core, thus introducing measurement uncertainties, for example, residual saturation during flow experiments.
    [0020] To reduce such effects, a high volume double cylinder separator pressure regulator pump is used to maintain the separator pressure in a bidirectional mode of constant pressure in pair. Two high temperature, high pressure and large volume storage cells are employed, and the fluid levels (that is, the location of the oil / water and gas / oil interfaces) in the separator are detected using interface transmitters and liquid radar level. guided wave. This ensures that each injection pump draws the correct fluid by maintaining the fluid level away from the separator's orifices. When the pressure of the separator increases above a selected setpoint (usually the same or close to the back pressure provided by the back pressure regulator pump), the back pressure regulator pump quickly removes part of the heavier fluid from the bottom of the separator. In addition, if the separator pressure drops below the set point, the separator pressure regulator pump will quickly inject part of the heavier fluid into the separator. During this pressure maintenance operation, if the separator pressure regulator pump is required to store or obtain fluid as stated, two high temperature, high pressure storage containers (accumulators) are dedicated to the separator pressure regulator pump for this purpose. The pressure, temperature and composition of the fluids in these containers are kept close (or identical) to those of the separator.
    [0021] Accurate regulation of back pressure leads to more reliable displacements in the core sample, which in turn leads to more accurate measurement of single-phase or multi-phase flow properties (from which the relative permeabilities derive). Additionally, the reduced variation in the separator pressure decreases the amount of compression that the injection pumps need to generate in order to provide free pulse flow at the core sample inlet, both for steady-state and non-steady-state recirculation flow experiments. .
    [0022] The present core flooding system allows all fluids to be recirculated in a wide range of flow rates, while a stable and accurate back pressure is maintained. This not only creates a more stable balance between phases through the system, but also minimizes the need for additional fluids.
    [0023] Reference will now be made in detail to the present embodiment of the invention, an example of which is illustrated in the attached drawing. Turning to Fig. 1, a schematic diagram of a modality of the apparatus 10 is shown, for flooding of multi-phase nucleus that includes a twelve-cylinder Quizix pumping system (5000 and 6000 series), two each for gas 12a, 12b, oil 14a, 14b and brine 16a, 16b to provide these fluids at selected flows and pressures individually, or in various combinations for the Hassler-type cylindrical core support (which has an axis of symmetry) 18, having several fluid connections and containing the core 20 through two-way manual valves 22, 24 and 26, respectively; two back pressure regulating pumps 28a, 28b for regulating the back pressure of the core support 18; two fluid / pressure compensation pumps 30a, 30b, which via pneumatic three-way valves 32a and 32b, respectively, and in cooperation with parallel connected compensation containers or accumulators 34a, 34b, via the two-way manual valve 36, adds or removes fluid from the acoustic three-phase separator 38 and the overloaded pressure pump 40 to provide pressure to the outside of the core 20, through the pneumatic three-way valve 42 and the manual two-way valve 44. The viscometer of gas 46, oil viscometer 48 and brine viscometer 50 are arranged in line with pumps 12a, 12b, 14a, 14b and 16a, 16b, respectively. Convection ovens 52, 54 and 56 hold pumps 12a, 12b, 14a, 14b, 16a, 16b and 28a, 28b and viscometers 46, 48 and 50, accumulators 34a, 34b and phase separator 38 at individually selected temperatures , respectively. Holes in the body of these furnaces allow the fluid flow line to pass through the core support and to and from the separator.
    [0024] In Fig. 1, solid lines represent 1/8 inch (0.3 cm) tubing, small dotted lines represent 1/4 inch (0.6 cm) tubing, and large dotted lines represent tubing 1 inch (2.5 cm). Differential pressure transducers are represented by “DPT”, manometric pressure transducers, by “PT”, thermocouplers by “T”, rupture discs by “RD”, pressure gauges by “X” and gas cylinder and buckets of liquid are marked as such. All parts of the device exposed to flooding fluids are made of Hastelloy and other corrosion resistant materials. Apparatus 10 is a closed-loop system that allows fluid to be injected / cojected into the core at high temperatures and pressures.
    [0025] The cores 20 are positioned on a Hassler 18 type core holder that has a sleeve, not shown in Fig. 1, and spiral Hastelloy distribution end plugs that have four holes, not shown in Fig. 1, each hole being connected to a 1/8 inch (0.3 cm) section of Hastelloy tubing.
    [0026] A 5000 Quizix double cylinder pump (16a, 16b) was used for brine injection, and two Quizix 6000 double cylinder pumps for injection of oil (14a, 14b) and gas (12a, 12b). each cylinder in the 5000 series has a volume of 9.3 cm3, while those for the 6000 series have a volume of 275 cm3. Maximum flow rates for each of these pumps are 15 and 200 cm3 / min, respectively. As stated above, in order to maintain a 6000 Quizix double-cylinder pump with constant back pressure (28a, 28b) was used, as opposed to an ordinary back pressure regulator. As will be discussed here below, this allowed to achieve and maintain stable backpressures at high flow rates in a wide range of fluid viscosities, which lead to a superior balance between fluids in partially miscible or miscible experiments, and more reliable displacements in immiscible experiments, as examples.
    [0027] To achieve full closed-loop fluid recirculation capacity, the effluent from core 20 is directed to orifice 58 of 3,500 cm3. The three-phase separator of acoustic Hastelloy 38 which is positioned in the mechanical convection oven 54, using manual two-way valves 60 and 62, and pneumatic three-way valves 64 and 66. The fluid levels contained in them are monitored using a guided wave level and fluid level transmitter to prevent the removal of an incorrect fluid from the injection pumps as pumps that inject fluids into the core also withdraw fluids from the separator 38. The pressure of the separator is controlled by a compensation module that includes 6000 Quizix double cylinder pumps 30a, 30b and two 2000 cm3 Hastellou compensation accumulators connected in parallel 34a, 34b are located in a third mechanical convection oven. To avoid heat loss, efficient insulation material was applied. Ultra-high molecular weight seals have been used through Quizix cylinders to prevent leakage when working with gases such as CO2.
    [0028] The overloaded pressure was maintained using the 5000 Quizix double-cylinder pump 40, heated using the heating strip 70 which allows the automatic adjustment of the overload pressure when the pore pressure is varied, and is advantageous for experiments with samples of rock that show sensitivity to such problems.
    [0029] Figure 2 is a schematic representation of a side view of a computed tomography (CT) scanner modality and vertical positioning system to locate a nucleus in the scanner, thus allowing measurements of saturation in situ under flow conditions. carried out. The refurbished medical CT scanner 72 for petrophysical applications, is rotated to the horizontal orientation to allow the core support 18 to be precisely located on it, and analyzes to be performed on vertically positioned rock samples, which have been discovered to reduce segregation effects of gravity. The vertical positioning system 74 was used to move the core holder 18 vertically from below on a gantry on the CT scanner 72. During a measurement with the core sample 20, the vertical positioning system 74 is synchronized with the table horizontal 76a, 76b of scanner 72 using the alignment device 77a, 77b synchronization which kept the unit until each set of measurements (scans at various positions along the length of the core) was completed, that is, until the new core 20 it is positioned on the core holder 18. Measurements can be made on vertically and horizontally oriented core samples by orienting the scanner both at 90 ° and 0 ° relative to the horizontal table, respectively.
    [0030] Quizix pumps and the vertical positioning system are powered by a full redundancy Liebert uninterruptible power source, not shown in the Figures since each group of experiments can take as long as several weeks to complete. The use of a reliable emergency power system protects the continuity of the flow during a measurement, and the synchronization of the vertical positioning system with the scanner.
    [0031] Before the measurements, the core flooding systems are pressure calibrated and tested for possible leaks. To achieve this, the pumps are connected at atmospheric pressure to make sure that their transducers measure zero gauge pressure. At this point, an accurate reference gauge pressure transducer is connected to the system. The core flooding apparatus is saturated with water and pressurized using one of the pump cylinders until a pressure of 9,500 psig (65.5 MPa man.) Is read on the reference pressure transducer. At this point, all pump transducers are set to read 9,500 psig (65.5 MPa man.). During this process, the device is tested for leakage such that a selected pressure can be maintained for 24 hours. All pump transducers are thus calibrated to read relative pressures for the same reference.
    [0032] The apparatus of Fig. 1 can be operated as follows. The core flooding apparatus 10 is first saturated with fluids, that is, the separator 38 can be filled with brine, oil, and gas while compensation accumulators 34a and 34b are filled with brine and gas only. The device is then pressurized (with additional gas) and heated to a selected temperature and pressure. The brine pump 16a, 16b, oil pump 14a, 14b and gas pump 12a, 12b are used to extract brine, oil and gas, respectively, from separator 38 and inject them into junction 100 through manual valves. two-way 102, 104 and 106, respectively, and two-way manual valve 108 with valves 26, 24 and 26, respectively, closed. This allows the brine, oil and gas to mix at the junction and flow, bypassing the core support 18 on the back pressure pump 28a, 28b. the complete recirculation mentioned above of the fluids was continued (bypassing the core support 18) for 12 to 36 hours, as an example, under the selected pressure and the temperature of the experiment. This technique was used to achieve a balance between fluids before the core flood was initiated. The fluids are in continuous contact in the separator 38, compensation accumulators 34a, 34b, flow lines and back pressure pump 28a, 28b during a flow initiation process.
    [0033] The brine, oil and gas pumps are operated in a constant flow mode in pair that allows the generation of a continuous flow of these fluids. The fluids that deviate from the core support 18 are received by the back pressure pump 28a, 28b in a constant flow mode in pair, the pressure at which the pump 28a, 28b is adjusted to receive fluids being called back pressure. This procedure produces a high quality of back pressure regulation at the core outlet 20 which leads to stable pressures through the core flooding system, reliable displacements in the core sample and also superior balance between the fluids in the system. When the receiving cylinder 110a of the back pressure pump 28a is filled, the receiving chamber 110b of the pump 28b automatically receives fluids at the same selected pressure. The control parameters of the cylinders are adjusted such that this transition occurs smoothly without introducing any pressure pulses into the core sample. That is, cylinder 110b is deflated and pressurized to the selected pressure before the transition occurs. After installation, cylinder 110a automatically injects its contents (a mixture of oil, brine and gas) into the bottom of the middle column of separator 38.
    [0034] Each of the cylinders 110a and 110b has a volume of 275 cm3 and, therefore, the introduction of this amount of fluid in the fixed volume separator 38 can lead to a significant increase in its pressure, and changes in the equilibrium conditions of the separator and the experiment can take place. This difficulty can be exacerbated if experiments are carried out at high flow rates. To avoid this problem, a pressure compensation system that includes Quizast Hastelloy double cylinder pumps 30a, 30b and the two 2,000 cm3 compensation accumulators connected in parallel (total volume 4,000 cm3) 34a, 34b has been added to the device. Both pumps and accumulators are pressurized for the temperature and pressure conditions of the experiment. When pump 28a begins to inject its contents into separator 38, compensation pump 30a, 30b begins to remove brine (the densest fluid) from the bottom of the middle column 112 of separator 38 (orifice shape other than a used by pump 28a, 28b), such that the pressure of the separator remains approximately constant at the selected pressure which is the same as the back pressure at the core sample output maintained by pump 28a, 28b. the brine taken from the separator either remains in the pump 30a, 30b or is introduced into the compensation accumulators 34a, 34b. The large volume of the separator 38 (3,500 cm3), helps to prevent significant fluctuations in its pressure during this process.
    [0035] As stated, by keeping the separator 38 constant, a stable balance will be maintained. To do this accurately, the pump 30a, 30b is operated in a bidirectional pair constant pressure rate mode as discussed here above, but also to inject brine into the separator in the event that the separator pressure drops below a set point selected. This can occur in two conditions: 1) if the separator 38 goes through a negative accumulation of fluids with a reduction in pressure in it since the continuous withdrawal of fluids from the separator 38 by pumps 12a, 12b, 14a, 14b and 16a, 16c and intermittent injection of fluids in the separator 38 by the pump 28a, 28b are not necessarily synchronized; and 2) if the leak occurs in the core 10 flooding system, the replacement fluids are derived from the separator 38, which can lead to a reduction in pressure therefrom. In both of these situations, the separator 38 is provided with the compensation brine by the pump 30a, 30b, and accumulators 34a, 34b to maintain its pressure at the selected set point. Fluid levels in separator 38 are monitored continuously using guided wave radar liquid level and interface transmitters to make sure that pumps 12a, 12b, 14a, 14b and 16a, 16b will not remove the incorrect fluids. The minimization of pressure variations in the back pressure and the pressure of the separator reach and maintain the balance between the fluids and establish the desired displacement in the core sample.
    [0036] After the three fluids (oil, gas, and brine) are recirculated, bypassing the core sample, for a sufficiently long time that the fluids are balanced, the fluids and the apparatus are ready to inject fluids into the sample. In general, the core 20 sample saturated with balanced brine and the core flooding apparatus 10 can then simultaneously inject one, two or three of the fluids into the core at various flows that allow various displacement mechanisms to be investigated. The computed tomography (CT) scanner 72 scans core 20 during measurements to obtain three-dimensional in situ saturation data. As stated, most flow experiments were performed while the cylindrical core support 18 was positioned such that its axis of symmetry was arranged vertically within the CT scanner. Fluids were injected from both the top and the bottom of the core support 18 and produced from the opposite end thereof.
    [0037] Figure 3 is a graph of the back pressure (MPa) as a function of time (min.) For two cores investigated, and demonstrates the stability of the back pressure during the separate injection of brine and carbon dioxide into the core 20 in the support of core 18. As stated, the flood system 10 is a closed-loop device and is operated under the condition of complete recirculation, which shows very stable pressures and therefore the maintenance of equilibrium conditions between fluids.
    [0038] The previous description of the invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The modalities have been selected and described in order to better explain the principles of the invention and its practical application in order to allow other experts in the art to make better use of the invention in various modalities and with various modifications as they are suitable for the particular use as contemplated. It is intended that the scope of the invention be defined by the claims attached to it.
    权利要求:
    Claims (25)
    [0001]
    1. Constant pressure recirculation device (10) to flood a core (20) with at least one selected fluid (12a, b, 14a, b, 16a, b), characterized by the fact that it comprises: a core support ( 18) to contain said core (20) and which has a longitudinal axis, an inlet orifice to introduce at least one selected fluid in contact with said core, an outlet orifice, and an orifice to apply a selected pressure to an outer surface of said core; an overloaded pressure pump (40) in fluid connection with the pressure port of the core support; at least one fluid pump for pumping at least one fluid selected in fluid communication with the inlet port of said core support; a separator (38) for separating at least one fluid selected from said at least one fluid pump by density thereof from other fluids leaving the core support after having passed through said core, said separator having a first bottom orifice, a second bottom orifice, and at least one fluid return orifice for returning fluid to said at least one pump; a back pressure pump (28a, b) in fluid communication with the outlet port of said core support to maintain a selected back pressure in the outlet port of said core support, and in fluid communication with the first bottom port of said separator to transfer the at least one selected fluid exiting said core support to the separator; and a pressure compensation pump (30a, b) in fluid communication with the second bottom orifice of said separator to prevent a change in pressure when at least one selected fluid is transferred to said separator by said back pressure pump.
    [0002]
    2. Apparatus according to claim 1, characterized in that said at least one pump is a double cylinder pump, by which said at least one selected fluid is removed from said separator when said at least one selected fluid it is injected into said core through said at least one fluid pump.
    [0003]
    Apparatus according to claim 2, characterized by the fact that said at least one pump is operated in a constant flow mode.
    [0004]
    4. Apparatus according to claim 1, characterized in that the pressure in said separator is controlled through said pressure compensation pump by removing or adding the densest fluid of at least one fluid selected from the second bottom hole of said separator.
    [0005]
    5. Apparatus according to claim 1, characterized by the fact that said at least one selected fluid is selected from oil, brine and a gas.
    [0006]
    6. Apparatus according to claim 5, characterized by the fact that the gas is selected from carbon dioxide, nitrogen, methane, sulfur dioxide and nitrogen dioxide and mixtures thereof.
    [0007]
    Apparatus according to claim 1, characterized in that said separator comprises an acoustic separator.
    [0008]
    Apparatus according to claim 7, characterized in that the phase limits for said at least one selected fluid and other fluids in said separator are determined using a guided wave interface and liquid level transmitter.
    [0009]
    Apparatus according to claim 1, characterized in that it additionally comprises a computer tomography scanner for measuring the attenuation of X-rays of fluids in said core, by which the saturation of at least one selected fluid is determined.
    [0010]
    Apparatus according to claim 9, characterized by the fact that the measurement of X-ray attenuation is performed under fluid flow conditions.
    [0011]
    Apparatus according to claim 9, characterized by the fact that the longitudinal axis of said core support is oriented in the vertical direction.
    [0012]
    Apparatus according to claim 11, characterized in that it additionally comprises a vertical core positioning apparatus for adjusting the position of said core in said computer tomography scanner.
    [0013]
    13. Method for flooding a nucleus by recirculating at constant counter pressure of at least one fluid selected through said nucleus, characterized by the fact that it comprises the steps of: pumping at least one selected fluid through a nucleus into a core support that has a longitudinal axis using at least one fluid pump; pressurize the outer surface of the core for a given pressure; separating at least one fluid selected by density from the other fluids leaving the core support after passing through the core, in a separator; returning at least one selected fluid to at least one pump, after the step of separating at least one selected fluid; maintaining a selected back pressure for at least one selected fluid exiting the core support; and removing fluid from or adding fluid to the separator to prevent an increase or decrease in back pressure, respectively, in said step of separating at least one selected fluid.
    [0014]
    Method according to claim 13, characterized in that the at least one fluid pump is a double cylinder pump, whereby at least one selected fluid is removed from the separator when at least one selected fluid is injected into the core support by at least one fluid pump.
    [0015]
    15. Method according to claim 14, characterized in that the at least one fluid pump is operated in a constant flow mode.
    [0016]
    16. Method according to claim 13, characterized in that the pressure in the separator is controlled by removing or adding the densest fluid from at least one fluid selected from the bottom of the separator.
    [0017]
    17. Method according to claim 13, characterized in that the at least one fluid is selected from oil, brine and a gas.
    [0018]
    18. Method according to claim 17, characterized by the fact that the gas is selected from carbon dioxide, nitrogen, methane, sulfur dioxide and nitrogen dioxide and mixtures thereof.
    [0019]
    19. Method according to claim 13, characterized in that said separator comprises an acoustic separator.
    [0020]
    20. Method according to claim 19, characterized in that the phase limits for said at least one selected fluid and other fluids in said separator are determined using a guided wave level and interface liquid transmitter.
    [0021]
    21. Method according to claim 13, characterized in that it further comprises the step of measuring the attenuation of X-rays of fluids in said core, by which the saturation of at least one selected fluid is determined.
    [0022]
    22. Method according to claim 21, characterized in that said step of measuring X-ray attenuation is performed using a computer tomography scanner.
    [0023]
    23. Method according to claim 22, characterized in that the measurement of X-ray attenuation is performed under fluid flow conditions.
    [0024]
    24. Method according to claim 22, characterized in that the longitudinal axis of the core support is oriented in the vertical direction.
    [0025]
    25. Method according to claim 24, characterized in that it additionally comprises the step of adjusting the position of the nucleus in said computer tomography scanner, by which multiple scans along the length of the nucleus are obtained.
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    法律状态:
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-02| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-10-15| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-19| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/12/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US42263610P| true| 2010-12-13|2010-12-13|
    US61/422636|2010-12-13|
    PCT/US2011/064738|WO2012082797A1|2010-12-13|2011-12-13|Recirculating, constant backpressure core flooding apparatus and method|
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