CN114577676B - Method for rapidly determining minimum miscible pressure of crude oil by considering multiple contact processes - Google Patents
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- CN114577676B CN114577676B CN202210232342.0A CN202210232342A CN114577676B CN 114577676 B CN114577676 B CN 114577676B CN 202210232342 A CN202210232342 A CN 202210232342A CN 114577676 B CN114577676 B CN 114577676B
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000010779 crude oil Substances 0.000 title claims abstract description 24
- 239000003921 oil Substances 0.000 claims abstract description 54
- 238000002360 preparation method Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 54
- 238000002474 experimental method Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a method for rapidly determining the minimum miscible pressure of crude oil taking into account a multiple contact process, comprising: respectively loading the oil sample into a sample preparation device and an oil sample intermediate container, opening a switch of an incubator, and heating to the stratum temperature; injecting the gas sample into the observation unit, pressurizing to the formation pressure, slowly injecting the oil sample into the observation unit, stopping when the liquid level in the capillary with the minimum radius reaches the top of the capillary, and recording the initial oil-gas interface position H 0 in the observation unit; reinjection of the balance gas in the sample preparation device to the checking unit until the initial oil-gas interface position, and recording the liquid level height of each capillary for the first contact at the time; the crude oil and the injection gas are contacted for a plurality of times; and drawing a relation curve of the difference value-pressure of the capillary liquid level height and H 0, wherein the intersection point of the curve and the abscissa is the MMP value. The invention considers the gas component change caused by the multiple contact process in the gas injection pressurizing displacement, and has the advantages of low cost and high accuracy.
Description
Technical Field
The invention relates to a method for testing Minimum Miscible Pressure (MMP) in the process of oil reservoir gas injection in the field of petroleum and natural gas exploration and development.
Background
Among the various methods of enhanced oil recovery, gas injection miscible flooding is a widely used and effective method. In gas injection miscible flooding, minimum Miscible Pressure (MMP) is one of the key parameters. MMP is the pressure at which the injected gas reaches a miscible phase after multiple contacts with crude oil at reservoir temperature, at which time the interfacial tension between the injected gas and crude oil becomes zero to achieve a miscible phase. MMP is currently established by standard methods (SY/T6573-2016), but the thin tube experimental method has the disadvantages of time consumption and high cost; the rising bubble method and the disappearing interfacial tension method have a narrow application range due to the limited displacement type and the lack of a multi-contact miscible process, respectively.
The patent 'oil gas minimum miscible pressure determining method and device' (CN 111256900B) discloses a method for measuring MMP by calculating the gas-liquid equilibrium constant of each component, wherein the method is based on theoretical calculation and needs to be mutually verified with experimental results. The patent 'a test model of minimum miscible pressure and a manufacturing method thereof' (CN 111781104A) discloses a method for measuring MMP by measuring the volume parameter of hanging drop at the tail end of a capillary, and the method is simpler but can not embody the multiple contact process between injected gas and crude oil. The patent 'a device and a method for testing minimum miscible pressure of gas after multistage contact' (CN 107238463A) discloses a device and a method for testing MMP of gas after multiple contact, which consider the multiple contact miscible process, but the principle is still based on a tubule experiment, and the experiment is time-consuming and has high cost.
Disclosure of Invention
The invention aims to provide a method for rapidly determining the minimum miscible pressure of crude oil by considering the multiple contact process, which has reliable principle, obtains MMP by considering the component change in the multiple contact miscible process and through the trend of reducing the interfacial tension, has sufficient sources of required test materials, is simple and convenient to operate, and greatly reduces the time for determining the miscible pressure and the complexity of required instruments.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
Firstly, preparing an oil sample under the formation temperature and pressure conditions, injecting the oil sample and the gas sample into a checking unit by adopting a double-pump normal direction, adjusting the height of a capillary support, recording the oil-gas interface position of the checking unit when the liquid level in a capillary with the minimum radius reaches the top of the capillary, then, reinjecting the injected gas into a sample preparation device to fully contact and mix the injected gas with the formation crude oil in the sample preparation device to form balanced gas, and injecting the balanced gas in the sample preparation device into the checking unit, wherein the liquid level rising height in the capillary is changed at the moment, and the liquid level rising height has the following relation with the interfacial tension:
Wherein h: elevation height, cm;
Δρ: the density of the experimental oil sample, g/cm 3;
g: acceleration of gravity, cm/s 2;
sigma: experimental oil sample surface tension dyn/cm;
r: capillary radius, cm;
θ: contact angle, °.
And observing and recording the change of the liquid level in the capillary tube in the whole experimental process by using a computer and a high-definition camera. And carrying out multiple contact, increasing the pressure by 0.5MPa compared with the pressure of the upper stage in each contact, increasing the pressure step by step, continuously collecting data, and extrapolating to obtain MMP when the liquid level height change is in a linear relation after a certain balance gas injection.
The method for rapidly determining the minimum miscible pressure of crude oil by considering the multiple contact process is completed by means of a capillary liquid level descent test device, the device comprises a sample preparation device, an oil sample middle container, a gas sample middle container, a checking unit, a high-definition camera and a computer, wherein the checking unit is a hollow cube, a lifting bracket is arranged at the bottom, three capillaries with different radiuses and same height are parallelly arranged on the bracket, an air injection hole is arranged at the top of the cube, an liquid injection hole is arranged at the left end, an observation window is arranged at the right end, the observation window is opposite to the high-definition camera, the high-definition camera is connected with the computer, the checking unit is respectively connected with the sample preparation device, the oil sample middle container and the gas sample middle container, the sample preparation device, the oil sample middle container and the gas sample middle container are respectively connected with a displacement pump, and the checking unit is positioned in a constant temperature box, and the method sequentially comprises the following steps:
(1) Respectively loading the prepared oil sample into a sample preparation device and an oil sample intermediate container, testing oil sample components by using a oil chromatograph and a gas chromatograph, opening a switch of an incubator, and heating a checking unit to the stratum temperature;
(2) After vacuumizing the checking unit by using a vacuum pump, injecting a gas sample into the checking unit from a gas sample intermediate container, pressurizing the checking unit to the formation pressure, then slowly injecting the oil sample into the checking unit by using a double-pump method, namely, a pump withdrawal pump connected with the gas sample intermediate container and a pump feeding pump connected with an oil sample intermediate container, checking through a checking window, stopping oil sample injection when the liquid level in the capillary with the minimum radius reaches the top of the capillary, and recording the initial oil-gas interface position H 0 in the checking unit;
(3) The method comprises the steps of using a double-pump method, namely, pumping in an oil sample intermediate container connected with a displacement pump and pumping out a sample preparation device connected with the displacement pump, injecting an oil sample into an observation unit and reinjecting a gas sample into the sample preparation device, so that the pressure in the sample preparation device is increased by 0.5MPa compared with the stratum pressure, at the moment, the crude oil is in first contact with the injected gas, stirring the sample preparation device to fully mix the oil and the gas, and after the oil and the gas reach balance, using the double-pump method, namely, pumping in the oil sample intermediate container connected with the displacement pump and the sample preparation device connected with the displacement pump, reinjecting balance gas in the sample preparation device into the observation unit, stopping injecting the gas when the liquid level of the observation unit reaches an initial oil-gas interface position H 0, and recording the liquid level of each capillary by a high-definition camera;
(4) Repeating the step (3) for a plurality of times (not less than 10 times) to realize the contact of crude oil and injection gas for a plurality of times, wherein the pressure in the sample preparation device is increased by 0.5MPa compared with the previous contact;
(5) The computer uses the difference value between the liquid level height and H 0 in each capillary tube obtained after each contact of crude oil and injected gas as an ordinate, uses the pressure in each contact sample preparation device as an abscissa, draws three curves, extrapolates each curve, and the intersection point of the curve and the abscissa is the measured MMP value.
In the invention, the injected gas in the high-pressure observation unit is a component fully balanced with the crude oil under the current pressurization value after each contact of the crude oil and the injected gas, and the crude oil is an original component, so that the process simulates the interfacial tension of the crude oil and the extraction enriched gas in the forward contact process.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a method for testing MMP by injecting a test gas sample into a system to contact with the test oil sample under the reservoir temperature condition, and then raising the pressure to reduce the interfacial tension of an oil phase, so as to reflect the drop of the liquid level in a capillary. The method is simple and convenient to operate, has high measurement speed, considers the key mechanism of gas component change caused by the multiple contact process in the gas injection pressurizing displacement process, and has the advantages of low cost and high accuracy.
Drawings
FIG. 1 is a graph of MMP test results.
FIG. 2 is a schematic diagram of the MMP test device.
In the figure: 1-a high pressure displacement pump; 2-valve; 3. 4-an oil sample and gas sample intermediate container; 5-a pressure gauge; 6-a sample preparation device; 7-a constant temperature box; 8-preheating coil pipes; 9-a viewing unit; 10-capillary tube; 11-capillary rack; 12-a lifter; 13-a viewing window; 14-high-definition camera; 15-computer.
Detailed Description
The present invention is further described below with reference to examples of embodiments according to the accompanying drawings so as to facilitate understanding of the present invention by those skilled in the art. It should be understood that the invention is not limited to the precise embodiments, and that various changes may be effected therein by one of ordinary skill in the art without departing from the spirit or scope of the invention as defined and determined by the appended claims.
Fig. 2 is a schematic diagram of an MMP test device, the device includes a sample preparation device 6, an oil sample middle container 3, a gas sample middle container 4, a checking unit 9, a high-definition camera 14 and a computer 15, the checking unit is a hollow cube, a lifting support (including a capillary rack 11 and a lifting instrument 12) is arranged at the bottom, three capillaries 10 with different radiuses and same height are arranged on the support in parallel, a gas injection hole is arranged at the top of the cube, a liquid injection hole is arranged at the left end, a viewing window 13 is arranged at the right end, the viewing window faces the high-definition camera 14, the high-definition camera is connected with the computer 15, the checking unit is respectively connected with the sample preparation device, the oil sample middle container and the gas sample middle container, the sample preparation device, the oil sample middle container and the gas sample middle container are respectively connected with a displacement pump 1, and the checking unit is positioned in a constant temperature box 7.
The experiment is carried out by selecting an oil sample with CO 2 MMP of 25.7MPa at 60 ℃ through a thin tube test, injecting a gas sample, selecting CO 2 with purity of 99.99%, placing the oil sample into an oil sample intermediate container and a sample preparation device, placing the gas sample into the gas sample intermediate container, measuring and configuring the oil gas component of the experimental oil sample through a oil phase chromatograph and a gas phase chromatograph, placing the capillary tube on a bracket, carrying out horizontal correction on the capillary tube, and connecting the capillary tube with an experimental instrument in sequence.
Heating an experimental container to 60 ℃, vacuumizing a high-pressure checking unit by using a vacuum pump at normal temperature, opening a valve connected with the checking unit and an oil sample intermediate container, injecting CO 2 into the checking unit and pressurizing to the formation pressure, slowly injecting the oil sample in the intermediate container into the checking unit by using a double-pump method, observing the position of a liquid level through an observation window, stopping oil sample injection when the liquid level in a capillary with the minimum radius reaches the top of the capillary, recording the position of an oil-gas interface in the checking unit, keeping the position of the oil-gas interface in the observation unit unchanged every time of subsequent pressurizing, withdrawing CO 2 into a sample preparation device filled with the oil sample by using the double-pump method after data recording is completed, increasing the pressure by 0.5MPa, and stirring and balancing for 2 hours. After the injected gas and crude oil are contacted for the first time, the balance gas is injected back into the checking unit to the same oil-gas interface position by using a double pump method, the liquid level height of the capillary is recorded, the steps are repeated, the height and the pressure values obtained under different pressure points in the three capillaries are drawn into a relation curve, then the relation curve is extrapolated, when the liquid level height is zero, the corresponding pressure value is the MMP value, the extrapolated MMP is about 25MPa (the test result is shown in figure 1), and the extrapolated MMP is more consistent with the test result of the capillary.
Claims (2)
1. The method for rapidly determining the minimum miscible pressure of crude oil by considering the multiple contact process is completed by means of a capillary liquid level descent test device, the device comprises a sample preparation device, an oil sample middle container, a gas sample middle container, a checking unit, a high-definition camera and a computer, wherein the checking unit is a hollow cube, a lifting bracket is arranged at the bottom, three capillaries with different radiuses and same height are parallelly arranged on the bracket, an air injection hole is arranged at the top of the cube, an liquid injection hole is arranged at the left end, an observation window is arranged at the right end, the observation window is opposite to the high-definition camera, the high-definition camera is connected with the computer, the checking unit is respectively connected with the sample preparation device, the oil sample middle container and the gas sample middle container, the sample preparation device, the oil sample middle container and the gas sample middle container are respectively connected with a displacement pump, and the checking unit is positioned in a constant temperature box, and the method sequentially comprises the following steps:
(1) Respectively loading the prepared oil samples into a sample preparation device and an oil sample intermediate container, opening a switch of an incubator, and heating the checking unit to the stratum temperature;
(2) After vacuumizing the checking unit by using a vacuum pump, injecting a gas sample into the checking unit from a gas sample intermediate container, pressurizing the checking unit to the formation pressure, then slowly injecting the oil sample into the checking unit by using a double-pump method, namely, a pump withdrawal pump connected with the gas sample intermediate container and a pump feeding pump connected with an oil sample intermediate container, checking through a checking window, stopping oil sample injection when the liquid level in the capillary with the minimum radius reaches the top of the capillary, and recording the initial oil-gas interface position H 0 in the checking unit;
(3) The method comprises the steps of using a double-pump method, namely, pumping in an oil sample intermediate container connected with a displacement pump and pumping out a sample preparation device connected with the displacement pump, injecting an oil sample into an observation unit and reinjecting a gas sample into the sample preparation device, so that the pressure in the sample preparation device is increased by 0.5MPa compared with the stratum pressure, at the moment, the crude oil is in first contact with the injected gas, stirring the sample preparation device to fully mix the oil and the gas, and after the oil and the gas reach balance, using the double-pump method, namely, pumping in the oil sample intermediate container connected with the displacement pump and the sample preparation device connected with the displacement pump, reinjecting balance gas in the sample preparation device into the observation unit, stopping injecting the gas when the liquid level of the observation unit reaches an initial oil-gas interface position H 0, and recording the liquid level of each capillary by a high-definition camera;
(4) Repeating the step (3) for a plurality of times to realize the contact of crude oil and injection gas for a plurality of times, wherein the pressure in the sample preparation device is increased by 0.5MPa compared with the previous contact;
(5) The computer uses the difference value between the liquid level height and H 0 in each capillary tube obtained after each contact of crude oil and injected gas as an ordinate, uses the pressure in each contact sample preparation device as an abscissa, draws three curves, extrapolates each curve, and the intersection point of the curve and the abscissa is the measured MMP value.
2. The method for rapidly determining a minimum miscible pressure of crude oil taking into account a multiple contact process as claimed in claim 1, wherein the multiple contact of crude oil and injection gas is not less than 10 times.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209055435U (en) * | 2018-09-20 | 2019-07-02 | 中国石油化工股份有限公司 | For CO2Crude oil quickly determines the experimental provision of first contacts miscible pressure |
| CN113075081A (en) * | 2021-04-08 | 2021-07-06 | 西南石油大学 | Device and method for measuring solid phase deposition amount in multiple contact processes of injected gas and crude oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4766558A (en) * | 1986-03-21 | 1988-08-23 | Amoco Corporation | Method of calculating minimum miscibility pressure |
| CN107238463B (en) * | 2017-05-24 | 2019-12-31 | 西南石油大学 | Device and method for testing minimum miscible pressure of gas after multistage contact |
| CN111909679B (en) * | 2020-06-19 | 2021-06-11 | 中国石油大学(华东) | Preparation method and application of composition for reducing minimum miscible pressure of carbon dioxide and crude oil based on aerosol surfactant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209055435U (en) * | 2018-09-20 | 2019-07-02 | 中国石油化工股份有限公司 | For CO2Crude oil quickly determines the experimental provision of first contacts miscible pressure |
| CN113075081A (en) * | 2021-04-08 | 2021-07-06 | 西南石油大学 | Device and method for measuring solid phase deposition amount in multiple contact processes of injected gas and crude oil |
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