CN113075110A - Multifunctional accurate metering device for rock core displacement experiment - Google Patents
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 27
- 239000011435 rock Substances 0.000 title claims abstract description 19
- 238000002474 experimental method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 120
- 239000007788 liquid Substances 0.000 claims abstract description 84
- 230000035699 permeability Effects 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 235000019198 oils Nutrition 0.000 claims description 36
- 230000006698 induction Effects 0.000 claims description 29
- 230000001186 cumulative effect Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 239000007791 liquid phase Substances 0.000 claims description 2
- 235000019476 oil-water mixture Nutrition 0.000 claims description 2
- 239000002569 water oil cream Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 238000011161 development Methods 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention provides a multifunctional accurate metering device for a rock core displacement experiment, which comprises: the device comprises a filtering system, a permeability measuring system, a gas flow measuring system, an oil-water metering system and a calculating device; the filtering system comprises a filter and a flowmeter; the permeability measuring system comprises a liquid viscometer, an inlet pressure sensor, a confining pressure sensor and an outlet pressure sensor; the gas-liquid separator, the dryer and the gas flowmeter of the gas flow measuring system; the oil-water metering system comprises a gas-liquid separator, a differential pressure sensor, an oil-water collecting collector and an electronic balance; the calculating device is respectively connected with the liquid flow meter, the liquid viscometer, the inlet pressure sensor, the confining pressure sensor, the outlet pressure sensor, the gas flow meter, the differential pressure sensor and the electronic balance. The method has the advantages that the real-time change of the permeability of the injected liquid and the rock core is monitored in real time, the automatic measurement of the volume and the quality of oil, water and gas is realized, and the human error is reduced.
Description
Technical Field
The invention relates to the field of metering devices, in particular to a multifunctional accurate metering device for a rock core displacement experiment.
Background
The oil and gas resources are important guarantee for human activities and social development, along with the rapid development of economy, the human needs for the oil and gas resources are increased at a high speed, how to realize the efficient development of oil and gas fields is important content for the development of oil and gas reservoirs, and the supply quantity of the oil and gas resources can be ensured. At present, oil workers usually adopt indoor physical simulation experiments and numerical simulation techniques to simulate the development dynamic process of oil and gas reservoirs, and then formulate reasonable development schemes, and realize the efficient development of the oil and gas reservoirs. The indoor displacement experiment is the basis for optimizing development parameters such as oil reservoir water injection time, injection amount, injection fluid type, injection speed and the like, so that the method is particularly important for accurately measuring all parameters in the experiment process. Wherein the unable real time monitoring of injected liquid, rock core permeability is presented as the owner, and simultaneously at oil gas water measurement in-process, the inaccurate reason of oil, water measurement lies in that the oil water two-phase separation can not be accomplished at the instant, can have the emulsion that the profit is mutually soluble, and current displacement device has following defect:
1. the conventional displacement device cannot accurately observe the amount of the displacement fluid used in the displacement.
2. In the displacement process, the permeability of the rock core can be changed continuously due to the injection of the displacement fluid and the change of factors such as pressure, and the change of the permeability of the rock core cannot be monitored in real time by the conventional displacement device.
3. The existing displacement device mostly adopts manual reading of the volume of oil and water, and the manual reading error is uncontrollable.
4. Oil-water mixed phases (emulsion) are easily formed by oil and water phases flowing at high speed, the problem of oil-water metering result loss in the oil-water mixed phase cannot be solved by the conventional metering device, and the real volumes of oil and water cannot be respectively obtained.
Disclosure of Invention
In order to solve the above problems, the present invention provides a multifunctional accurate measuring device for core displacement experiments, which mainly comprises: the device comprises a filtering system, a permeability measuring system, a gas flow measuring system, an oil-water metering system and a calculating device;
wherein, the filtration system includes filter, liquid flow meter.
The liquid flowmeter is arranged on a pipeline between the filter and the liquid viscometer.
The liquid permeability measuring system comprises a liquid viscometer, an inlet flowmeter, an outlet flowmeter, an inlet pressure sensor, a confining pressure sensor and an outlet pressure sensor, wherein data of the liquid permeability measuring system can be connected to a computing device to obtain real-time permeability parameters through analysis data. Wherein A is1Is the inlet liquid volume, A2Is the volume of the outlet liquid, mu is the viscosity of the displacement fluid, P1Is the inlet pressure, P2Is the outlet pressure, P3And confining pressure of the core holder.
The gas-liquid separator, the dryer and the gas flowmeter of the gas flow measuring system;
and the first end of the gas-liquid separator is connected with the core holder through a pipeline, and the second end of the gas-liquid separator is connected with the gas flowmeter through a dryer. Wherein A is2As the flow rate of gas
The oil-water metering system comprises a gas-liquid separator, a differential pressure sensor, an oil-water collecting collector and an electronic balance;
the third section of the gas-liquid separator is connected with an oil-water collector;
the electronic balance is arranged below the oil-water collector and is used for collecting the weight of an oil-water mixture in the oil-water collector;
the differential pressure sensor is arranged at the induction point of the oil-water collector and used for detecting the height H of the liquid column above the induction point of the oil-water collector2；
The calculating device is respectively connected with the liquid flow meter, the liquid viscometer, the inlet pressure sensor, the confining pressure sensor, the outlet pressure sensor, the gas flow meter, the differential pressure sensor and the electronic balance.
Further, the calculation device adopts the following formula to calculate the PV number and the core permeability value;
Qi＝(A2i-A1i)
ΔPi＝|P1i-P2i|
Qithe liquid flow, Δ P, through the core holder at time ttThe pressure difference mu between two ends of the rock core holder at the t momenttThe viscosity of the fluid passing through the core holder at time t. KtThe core permeability measured at time t. Can be measured and averaged for a plurality of timesThe value can improve the efficiency and the precision of measuring the permeability of the rock core.
The accumulated water yield, the accumulated oil yield, the water content and the oil displacement efficiency value can be obtained through calculation by the calculating device.
Vtw+Vto＝Vt
V1t+V2t＝Vt
ρoVto+ρwVtw＝mt
S＝π*R2
V1t＝S*H1t
V2t＝S*H2t
Vto-1+Vtw-1＝Vi-1
V1t-1+V2t-1＝Vi-1
ρoVot-1+ρwVwt-1＝mt-1
V1t-1＝S*H1t-1
V2t-1＝S*H2t-1
VtwIs the volume V of water in the oil-water collector at the t momenttoIs the volume of water in the oil-water collector at the t-th time, H1tIs the height of the liquid column below the induction point at the t-th moment, H2tIs a liquid column height value above the induction point, V1tThe height of a liquid column below a sensing point in the oil-water collector at the t moment V2tThe volume of the oil-water collector above the induction point at the t-th time,
Vtw+1the volume V of water in the oil-water collector at the t +1 th momentto+1The volume of water in the oil-water collector at the t +1 th moment, H1t+1Is the height of the liquid column below the induction point at the t +1 th moment, H2t+1Is a liquid column height value above the induction point, V1t+1The height of the liquid column below the induction point of the oil-water collector at the t +1 th moment, V2t+1The volume above the induction point in the oil-water collector at the t +1 th moment,
oil increment in the interval from the t moment to the t +1 momentIs DeltaVO＝Vot+1-VOt
The water increment is delta V from the t moment to the t +1 momentw＝Vwt+1-Vwt
The cumulative oil increment is
The cumulative water addition is
EWIs the water content at the outlet end, EdFor oil displacement efficiency, VoiIs the saturated oil quantity.
Further, in the above-mentioned case,
the oil-water collector comprises a quick-opening valve;
the quick-opening valve is used for discharging liquid when the liquid level of the total amount of the water and the oil-water emulsion is higher than the first-point or the total liquid phase liquid level in the oil-water collector is higher than the rated value of the oil-water collector.
The invention has the beneficial effects that:
1. the filtering system can treat the injection liquid in advance and remove the influence of impurities in the injection liquid on a displacement experiment.
2. The invention is based on the combination of the measuring instrument and the mathematical formula, and can monitor the PV number and the core permeability in real time.
3. The invention realizes the automatic measurement and recording of the volume and the mass of oil, gas and water, and eliminates errors introduced by human factors.
Drawings
Fig. 1 is a schematic connection relationship diagram of the multifunctional accurate metering device for core displacement experiments.
In the figure, 1 is a filter; 2, a viscometer; 3 is a liquid flowmeter; 4 is a pressure sensor; 5 is a rock core holder; 6 is a pressure sensor; 7 is a liquid flowmeter; 8 is a pressure sensor; 9 is a gas-liquid separator; 10 is an oil-water separator; 11 is a quick-opening valve; 12 is an electronic balance; 13 is a differential pressure sensor; 14 a dryer; 15 is a gas flowmeter; 16 is a computing device; 17 is a signal transmission line; 18 is a pipeline.
Detailed Description
As shown in FIG. 1, the invention mainly comprises a filtering system, a liquid permeability measuring system, a gas flow measuring system, an oil-water metering system and a calculating device;
wherein the filtration system is linked by a 1 filter via a line to a 2 viscometer with viscosity data μtTransmitted to a computing device 16 for computation through a signal transmission line.
The liquid measurement permeability measurement system is characterized in that a rock core holder 5 is connected with two ends through pipelines to be respectively connected with a pressure sensor 4, a pressure sensor 8, a flow meter 7 and a confining pressure measurement system 6, and the upper end of the rock core holder 5 is connected with the pressure sensor 6.
Wherein 3, 7, 4, 6, 8 measure the inlet flow A respectively1Outlet flow rate A2Inlet pressure P1Outlet pressure P2Confining pressure P3The data is transmitted to 16 computing device for calculation through signal transmission line.
Wherein the gas flow system is composed of 9 gas-liquid separators for separating gas, 14 drier, 15 gas flow meter for measuring gas flow A3And the signals are transmitted to a computing system through a signal transmission line for computation.
The oil-water metering system is connected to the 10 oil-water collector from the third end of the gas-liquid separator, and the 12 electronic balance is located below the oil-water collector.
The electronic balance 12 collects the weight of the oil-water collector including the weight of oil and water in the oil-water collector.
The metering device 16 prestores a weight value of the oil-water collector when the oil-water collector is unloaded, and the computing device 16 subtracts the weight value of the oil-water collector when the oil-water collector is unloaded from the weight value collected by the electronic balance 12 to obtain the weight of oil and water in the oil-water collector.
The 13 differential pressure sensor is arranged at the induction point of the oil-water collector and used for detecting the height H of the liquid column above the induction point of the oil-water collector2And 13 the differential pressure sensor is connected to a computing device 16.
The computing device 16 is a computer device that has self-designed and programmed software with data computing and data processing capabilities installed.
The use steps of the multifunctional accurate metering device for the core displacement experiment are explained below.
S1, respectively aligning oil rho by using a specific gravity method before an experimentoWater density ρwMeasuring to obtain the inner diameter R of the oil-water collector 10 and the effective pore volume V of the rock corep。
S2, adding a quantitative oil product for experiments, and ensuring that the liquid level of the oil product reaches the induction point or above the joint of the differential pressure sensor 13 pipeline and the oil-water collector 10. Oil and water two-phase liquids may also be added, but care must be taken to ensure that only single-phase oil is present at the first point and above.
And S2, after the experiment is started, the injected liquid enters a permeability measuring system through a filtering system.
S3, calculating according to the following formula:
Qi＝(A2i-A1i)
ΔPi＝|P1i-P2i|
Qithe liquid flow, Δ P, through the core holder at time ttThe pressure difference mu between two ends of the rock core holder at the t momenttThe viscosity of the fluid passing through the core holder at time t. KtThe core permeability measured at time t. The average value can be obtained through multiple measurements, and the core permeability measurement efficiency and precision can be improved.
Thus, the real-time permeability and the real-time PV value of the core are measured.
S4, continuing the experiment, wherein in the experiment process, the oil-gas-water mixture flowing out of the outlet pipeline of the rock core holder 5 flows into the gas-liquid separator 9, the separated gas flows through the gas flowmeter 15 after being dried by the dryer 14, data are collected and recorded into the computing device 16, and the gas volume V is obtainedGi(ii) a The oil-water phase mixture flows out of the gas-liquid separator 6 and then enters an oil-water collector.
S5, the oil phase and the water phase are layered in the oil-water collector 10 due to density difference, and the electronic balance 12 and the differential pressure sensor 13 acquire and record data into the computing device 16. In this case, the calculation of the oil and water volumes in the software of the calculation means 16 takes place by the following steps:
Vtw+Vto＝Vt
V1t+V2t＝Vt
ρoVto+ρwVtw＝mt
S＝π*R2
the volume V of oil and water in the oil-water collector at a certain time t 10 can be calculatedto、Vtw。
A certain i-1 moment has Vot-1、Vwt-1、H1t-1And H2t-1Is composed of the following formula
V1t＝S*H1t
V2t＝S*H2t
Vto-1+Vtw-1＝Vi-1
V1t-1+V2t-1＝Vi-1
ρoVot-1+ρwVwt-1＝mt-1
V1t-1＝S*H1t-1
V2t-1＝S*H2t-1
VtwIs the volume V of water in the oil-water collector at the t momenttoIs the volume of water in the oil-water collector at the t-th time, H1tIs the height of the liquid column below the induction point at the t-th moment, H2tIs a liquid column height value above the induction point, V1tThe height of a liquid column below a sensing point in the oil-water collector at the t moment V2tThe volume of the oil-water collector above the induction point at the t-th time,
Vtw+1the volume V of water in the oil-water collector at the t +1 th momentto+1The volume of water in the oil-water collector at the t +1 th moment, H1t+1Is the height of the liquid column below the induction point at the t +1 th moment, H2t+1Is a liquid column height value above the induction point, V1t+1The height of the liquid column below the induction point of the oil-water collector at the t +1 th moment, V2t+1The volume above the induction point in the oil-water collector at the t +1 th moment,
the oil increment is delta V from the t moment to the t +1 momentO＝Vot+1-VOt
The water increment is delta V from the t moment to the t +1 momentw＝Vwt+1-Vwt
The cumulative oil increment is
The cumulative water addition is
In summary, the oil-water increment Δ V in the time interval from t to t +1 can be obtainedO＝Vot+1-VOt、ΔVw＝ Vwt+1-Vwt(ii) a The cumulative oil output and the cumulative water output from the time 0 of starting data acquisition and recording to the current time i can be respectively obtained
Setting the data storage interval time to record the instantaneous value delta V of oil, water and gas quantity at a certain moment iOt、ΔVwt、ΔVGtAccumulation of oil, water and gas
And the water content E can be obtained by a computing deviceWAnd oil displacement efficiency Ed。
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention, but not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A multi-functional accurate metering device that rock core displacement experiments were used includes: the system comprises a filtering system, a liquid permeability measuring system, a gas flow measuring system, an oil-water metering system and a calculating device; the filtering system comprises a filter and a liquid flow meter, wherein the liquid flow meter is arranged on a pipeline between the filter and the liquid viscometer;
the liquid permeability measuring system comprises a liquid viscometer, an inlet flowmeter, an outlet flowmeter, an inlet pressure sensor, a confining pressure sensor and an outlet pressure sensor, wherein data of the liquid permeability measuring system can be connected to a computing device to obtain real-time permeability parameters through analysis data. Wherein A is1Is the inlet liquid volume, A2Is the volume of the outlet liquid, mu is the viscosity of the displacement fluid, P1Is the inlet pressure, P2Is the outlet pressure,P3Confining pressure for the core holder;
the gas-liquid separator, the dryer and the gas flowmeter of the gas flow measuring system; and the first end of the gas-liquid separator is connected with the core holder through a pipeline, and the second end of the gas-liquid separator is connected with the gas flowmeter through a dryer. Wherein A is2The oil-water metering system for gas flow comprises a gas-liquid separator, a differential pressure sensor, an oil-water collecting collector and an electronic balance;
the third section of the gas-liquid separator is connected with an oil-water collector; the electronic balance is arranged below the oil-water collector and is used for collecting the weight of an oil-water mixture in the oil-water collector;
the differential pressure sensor is arranged at the induction point of the oil-water collector and used for detecting the height H of the liquid column above the induction point of the oil-water collector2(ii) a The calculating device is respectively connected with the liquid flow meter, the liquid viscometer, the inlet pressure sensor, the confining pressure sensor, the outlet pressure sensor, the gas flow meter, the differential pressure sensor and the electronic balance.
2. The multifunctional accurate metering device for the core displacement experiment as claimed in claim 1, wherein: the calculating device adopts the following formula to carry out PV number, liquid permeability, oil-gas-water integrated value, water content at the outlet end and oil displacement efficiency:
Qi＝(A2i-A1i)
ΔPi＝|P1i-P2i|
Qithe liquid flow, Δ P, through the core holder at time ttThe pressure difference mu between two ends of the rock core holder at the t momenttAt the t-th timeThe viscosity of the liquid passing through the core holder. KtThe core permeability measured at time t. The average value can be obtained through multiple measurements, and the efficiency and the precision of measuring the permeability of the rock core can be improved;
Vtw+Vto＝Vt
V1t+V2t＝Vt
ρoVto+ρwVtw＝mt
S＝π*R2
V1t＝S*H1t
V2t＝S*H2t
Vto-1+Vtw-1＝Vi-1
V1t-1+V2t-1＝Vi-1
ρoVot-1+ρwVwt-1＝mt-1
V1t-1＝S*H1t-1
V2t-1＝S*H2t-1
Vtwis the volume V of water in the oil-water collector at the t momenttoIs the volume of water in the oil-water collector at the t-th time, H1tIs the height of the liquid column below the induction point at the t-th moment, H2tIs a liquid column height value above the induction point, V1tThe height of a liquid column below a sensing point in the oil-water collector at the t moment V2tThe volume of the oil-water collector above the induction point at the t-th time,
Vtw+1the volume V of water in the oil-water collector at the t +1 th momentto+1The volume of water in the oil-water collector at the t +1 th moment, H1t+1Is the height of the liquid column below the induction point at the t +1 th moment, H2t+1Is a liquid column height value above the induction point, V1t+1The height of the liquid column below the induction point of the oil-water collector at the t +1 th moment, V2t+1The volume above the induction point in the oil-water collector at the t +1 th moment,
the oil increment is delta V from the t moment to the t +1 momentO＝Vot+1-VOt
The water increment is delta V from the t moment to the t +1 momentw＝Vwt+1-Vwt
The cumulative oil output is
The cumulative water yield is
EWIs the water content at the outlet end, EdFor oil displacement efficiency, VoiSaturated oil mass.
3. The multifunctional accurate metering device for the core displacement experiment as claimed in claim 1, wherein the oil-water collector comprises a quick-opening valve;
the quick-opening valve is used for distributing liquid when the liquid level of the total amount of the water and the oil-water emulsion is higher than an induction point or the total liquid phase liquid level in the oil-water collector is higher than the rated value of the oil-water collector.
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| CN115791683A (en) * | 2022-12-29 | 2023-03-14 | 西南石油大学 | Full-automatic high-precision oil-gas-water three-phase metering system based on infrared detection |
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