CN114167035B - Oil displacement efficiency measuring method - Google Patents
Oil displacement efficiency measuring method Download PDFInfo
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- CN114167035B CN114167035B CN202111527440.9A CN202111527440A CN114167035B CN 114167035 B CN114167035 B CN 114167035B CN 202111527440 A CN202111527440 A CN 202111527440A CN 114167035 B CN114167035 B CN 114167035B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 107
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 239000011435 rock Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 8
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims description 24
- 238000005192 partition Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 9
- 230000005484 gravity Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 88
- 238000005213 imbibition Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention relates to the technical field of oil and gas field development and discloses a novel water-absorbing and oil-discharging device which comprises a rock core chamber, wherein one end of the rock core chamber is sealed, the other end of the rock core chamber is provided with a baffle plate, one end of the rock core chamber, which is close to the baffle plate, is connected with one side of a water containing device through a sealing ring, two plug devices are respectively arranged on the other side wall of the water containing device, and oil-containing analyzers are arranged behind the plug devices and are connected with a computer system. And discloses a method for measuring the oil displacement efficiency of the device. According to the novel water-absorbing and oil-discharging device, only the side face of the core is contacted with water, so that the influence of gravity on self-water-absorbing and oil-discharging of the core is avoided, and the main power of water-absorbing and oil-discharging of the core is determined as capillary force; the efficiency of oil seepage and extraction of the core under the condition of incomplete saturated oil is considered, and the device has wide applicability. The method combines a weighing method and a volume method, considers the situation that the water absorption volume is larger than the oil discharge volume, and has more accurate oil displacement efficiency.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a method for measuring oil displacement efficiency.
Background
At present, a imbibition instrument is generally adopted to measure the efficiency of the core in the core by means of automatic water absorption and oil drainage, namely, the core with saturated oil is kept stand in water, the volume of the core absorbed by water is considered to be equal to the volume of the crude oil which is displaced, and the power of the core for absorbing water and draining oil is considered to be capillary force. The separated oil drops float up to the scale position at the upper end of the imbibition instrument under the action of buoyancy force, the volume of the separated oil can be read, and the volume of the separated oil is divided by the volume of saturated oil in the core, so that the self-priming oil displacement efficiency is obtained. But this approach ignores the effects of gravity: water enters the core pores to drive oil under the action of gravity, and oil is separated out of the core under the action of buoyancy, so that the oil seepage and driving amount of the core is calculated inaccurately, and the seepage and absorption effect is unknown. In addition, the general stratum core is not in a saturated oil state, but is in oil-gas-water three-phase or two-phase coexistence, so that the volume of water absorption is not necessarily equal to the volume of oil displacement, and in general, the volume of water absorption is larger than the volume of oil displacement, so that the calculation of the oil displacement efficiency can lead to the fact that the self-priming oil displacement efficiency is larger. For example, CN109115993a discloses a device and a method for measuring spontaneous imbibition displacement efficiency of a low permeability reservoir, which measure the mass change of a core caused by water-oil density difference according to a weighing method, and calculate the volume of water from which the core is imbibed; and then, determining the volume of oil in which the rock core is displaced and the volume of oil in water by combining a volumetric method, and when the error of two experimental results is less than 3%, considering that reasonable experimental data are obtained, averaging the data obtained by the two experimental methods, and calculating the self-imbibition oil displacement efficiency by using the data.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a measuring method for oil displacement efficiency.
In order to achieve the above object, the present invention relates in one aspect to a novel water-absorbing and oil-discharging device.
The utility model provides a novel oil extraction that absorbs water device, includes the rock core room, rock core room one end is sealed, and the other end is provided with the baffle, the one end that the rock core room is close to the baffle passes through one side that the sealing ring is connected the water installation, be equipped with two on the another lateral wall of water installation respectively and have stopper device, all be provided with the oiliness analysis appearance behind the stopper device, the computer system is connected to the oiliness analysis appearance.
Preferably, the water containing device is of a bottle body structure with a thick bottom and a thin top, the upper part of the bottle body is a neck, the neck is marked with scales, and the scales are gradually increased from top to bottom from 0.
Further, the core chamber is used for placing a core.
The invention further relates to a method for measuring oil displacement efficiency by adopting the novel water-absorbing oil discharge device.
The oil displacement efficiency measuring method comprises the following steps:
1) Cutting the core into cubes capable of being placed in the core chamber, and measuring the porosity phi and the oil saturation s of the core o Core m is weighed 1 ；
2) Placing a core in a core chamber and connecting the core with one end of a sealing ring;
3) Filling water in the water containing device to the 0 scale, connecting the water containing device with the other end of the sealing ring, and pumping out the partition plate;
4) The core starts to absorb water automatically, and the volume of the neck oil of the water containing device is calculated to be V 1 The oil content in water is measured by an oil content analyzer in water, and the oil content in water V is calculated by the oil content in water and the volume of water in a container 2 Volume V of water-absorbing and oil-draining 3 ＝V 1 +V 2；
5) Taking out the core, wiping and weighing m 2 Drying and weighing m 3 Calculating the water absorption volume V of the core Water and its preparation method ＝(m 2 -m 3 )/ρ Water and its preparation method ；
6) Since the core may not be 100% saturated oil, the water uptake volume may be greater than the oil extraction volume:
m 1 -ρ oil (oil) V Oil outlet +ρ Water and its preparation method V Water absorption ＝m 2
m 1 -ρ Oil (oil) V Oil outlet +ρ Water and its preparation method V Oil outlet +ρ Water and its preparation method (V Water absorption -V Oil outlet )＝m 2
(ρ Water and its preparation method -ρ Oil (oil) )V Oil outlet +ρ Water and its preparation method (V Water absorption -V Oil outlet )＝m 2 -m 1
Wherein V is Water absorption Equal to V in step 5 Water and its preparation method Thereby V can be calculated Oil outlet ；
Taking experimental errors into consideration, finally determining V by an arithmetic average method Oil discharge ＝(V 3 +V Oil outlet )/2；
The obtained core self-priming oil extraction efficiency is as follows:
in a preferred embodiment of the invention, the core is cut to a volume of 1cm 3 Is a cube of (c).
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the novel water-absorbing and oil-discharging device, only the side face of the core is contacted with water, so that the influence of gravity on self-water-absorbing and oil-discharging of the core is avoided, and the main power of water-absorbing and oil-discharging of the core is determined as capillary force;
(2) The device considers the oil seepage and drainage efficiency of the core under the condition of incomplete saturated oil, and has wide applicability;
(3) According to the oil displacement efficiency measuring method, the situation that the water absorption volume is larger than the oil discharge volume is considered by combining a weighing method and a volume method, and the obtained oil displacement efficiency is more accurate.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a novel water and oil suction and discharge device;
reference numerals in the drawings: 1-a rock chamber, 2-a baffle plate, 3-a sealing ring, 4-a water containing device, 5-a plug device, 6-an oil analyzer and 7-a computer system.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
As shown in fig. 1, the novel water-absorbing oil-discharging device comprises a rock chamber 1, wherein the rock chamber 1 is used for placing a rock core, one end of the rock core chamber 1 is closed, the other end of the rock core chamber is provided with a baffle plate 2, one end, close to the baffle plate 2, of the rock core chamber 1 is connected with one side of a water containing device 4 through a sealing ring 3, two plug devices 5 are respectively arranged on the other side wall of the water containing device, the water containing device 4 is of a bottle body structure with a thick bottom and a thin top, the upper part of the bottle body is a neck, scales are marked on the neck, and the scales are gradually increased from 0 to the bottom; the oil-containing analyzers 6 are arranged behind the plug devices 5, the oil-containing analyzers 6 monitor the oil content in the water of the water containing device 4 through the plug devices 5, the oil-containing analyzers 6 are connected with the computer system 7, and data are recorded through the computer system 7 in a statistics mode.
The oil displacement efficiency measuring method by adopting the novel water absorption and oil discharge device comprises the following steps:
1) Cutting the core into 1cm volume 3 Is measured by measuring the porosity phi=12% of the core, the saturation s of the oil o 64% of the core m is weighed 1 2.035g; in addition, the density ρ of water w ＝1.0g/cm 3 Measuring the density ρ of crude oil o ＝0.82g/cm 3
2) Placing a core in the core chamber 1 and connecting the core with one end of the sealing ring 3;
3) Filling water in the water containing device 4 to the 0 scale, connecting the water containing device with the other end of the sealing ring 3, and pumping out the partition plate 2;
4) The core starts to absorb water automatically, and the volume of the neck oil of the water containing device 4 is calculated to be V 1 Example V 1 =0.04 ml measurement of oil content in water by oil-in-water analyzer 6, 1ml in container, calculation of oil content in water volume V from oil content in water and volume of water in container 2 Volume V of water-absorbing and oil-draining fluid when 0.2×0.001/0.82=0.00024 ml 3 ＝V 1 +V 2 ＝0.04+0.00024＝0.04024ml；
5) Taking out the core, wiping and weighing m 2 2.096g, dried and weighed m 3 Calculate the water absorption volume V of the core to be 2.010g Water and its preparation method ＝(m 2 -m 3 )/ρ Water and its preparation method ＝0.086ml；
6) Since the core may not be 100% saturated oil, the water uptake volume may be greater than the oil extraction volume:
m 1 -ρ oil (oil) V Oil outlet +ρ Water and its preparation method V Water absorption ＝m 2
m 1 -ρ Oil (oil) V Oil outlet +ρ Water and its preparation method V Oil outlet +ρ Water and its preparation method (V Water absorption -V Oil outlet )＝m 2
(ρ Water and its preparation method -ρ Oil (oil) )V Oil outlet +ρ Water and its preparation method (V Water absorption -V Oil outlet )＝m 2 -m 1
Wherein V is Water absorption Equal to V in step 5 Water and its preparation method Thereby calculating and obtaining V Oil outlet ＝0.03049ml；
The experiment has certain error, so that V is finally determined by an arithmetic average method Oil discharge ＝(V 3 +V Oil outlet )/2＝0.0354ml；
The obtained core self-priming oil extraction efficiency is as follows:
the foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (1)
1. The oil displacement efficiency measurement method is characterized by adopting a water absorption and oil discharge device to measure, wherein the water absorption and oil discharge device comprises a rock core chamber and a water containing device, the rock core chamber is used for placing a rock core, one end of the rock core chamber is sealed, a partition plate is arranged at the other end of the rock core chamber, one end of the rock core chamber, which is close to the partition plate, is connected with one side of the water containing device through a sealing ring, two plug devices are respectively arranged on the other side wall of the water containing device, and an oil analyzer is arranged behind each plug device and is connected with a computer system; the water containing device is of a bottle body structure with a thick bottom and a thin top, the upper part of the bottle body is provided with a neck, the neck is marked with scales, and the scales are gradually increased from 0 from top to bottom;
the oil displacement efficiency measuring method specifically comprises the following steps:
1) Cutting the core into 1cm volume 3 Is arranged in a rock core chamber, and the porosity phi and the oil saturation s of the rock core are measured o Core m is weighed 1 ；
2) Placing a core in a core chamber and connecting the core with one end of a sealing ring;
3) Filling water in the water containing device to the 0 scale, connecting the water containing device with the other end of the sealing ring, and pumping out the partition plate;
4) The core starts to absorb water automatically, and the volume of the neck oil of the water containing device is calculated to be V 1 The oil content in water is measured by an oil content analyzer in water, and the oil content in water V is calculated by the oil content in water and the volume of water in a container 2 Volume V of water-absorbing and oil-draining 3 ＝V 1 +V 2 ；
5) Taking out the core, wiping and weighing m 2 Drying and weighing m 3 Calculating the water absorption volume V of the core Water and its preparation method ＝(m 2 -m 3 )/ρ Water and its preparation method ；
6) The core is not 100% saturated oil, so the water absorption volume is greater than the oil extraction volume:
m 1 -ρ oil (oil) V Oil outlet +ρ Water and its preparation method V Water absorption ＝m 2
m 1 -ρ Oil (oil) V Oil outlet +ρ Water and its preparation method V Oil outlet +ρ Water and its preparation method (V Water absorption -V Oil outlet )＝m 2
(ρ Water and its preparation method -ρ Oil (oil) )V Oil outlet +ρ Water and its preparation method (V Water absorption -V Oil outlet )＝m 2 -m 1
Wherein V is Water absorption Equal to V in step 5 Water and its preparation method Thereby V can be calculated Oil outlet ；
Taking experimental errors into consideration, finally determining V by an arithmetic average method Oil discharge ＝(V 3 +V Oil outlet )/2；
The obtained core self-priming oil extraction efficiency is as follows:
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