CN114167035A - Novel water absorption and oil discharge device and oil displacement efficiency measuring method - Google Patents
Novel water absorption and oil discharge device and oil displacement efficiency measuring method Download PDFInfo
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- CN114167035A CN114167035A CN202111527440.9A CN202111527440A CN114167035A CN 114167035 A CN114167035 A CN 114167035A CN 202111527440 A CN202111527440 A CN 202111527440A CN 114167035 A CN114167035 A CN 114167035A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 6
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000000643 oven drying Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 2
- 238000003860 storage Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 92
- 238000005213 imbibition Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000002474 experimental method 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 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
- 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 absorption and oil discharge device which comprises a core chamber, wherein one end of the core chamber is closed, the other end of the core chamber is provided with a partition plate, one end of the core chamber, which is close to the partition plate, is connected with one side of a water containing device through a sealing ring, the other side wall of the water containing device is respectively provided with two plug devices, oil content 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 oil-discharging device, only the side surface of the core is in contact with water, so that the influence of gravity on self-water-absorbing oil-discharging of the core is avoided, and the main power of water-absorbing oil-discharging of the core is determined to be capillary force; the efficiency of oil seepage and drainage of the rock 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 condition that the water absorption volume is larger than the oil discharge volume, and obtains 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 novel water absorption and oil drainage device and an oil displacement efficiency measuring method.
Background
At present, the efficiency of the rock core for automatically absorbing water and expelling oil in the rock core is generally measured by adopting an imbibition instrument, namely the rock core saturated with oil is kept still in water, the water absorption volume of the rock core is considered to be equal to the volume of the displaced crude oil, and the power for absorbing water and expelling oil in the rock core is considered to be capillary force. The separated oil drops float to the position with scales at the upper end of the imbibition instrument under the action of buoyancy, the volume of separated oil can be read out, and the volume of the separated oil is divided by the volume of saturated oil in the core, namely the self-priming oil displacement efficiency. But this approach ignores the effects of gravity: water enters the pores of the rock core under the action of gravity to displace oil, and oil separates out of the rock core under the action of buoyancy, so that the calculation of the oil displacement amount of the rock core imbibition is inaccurate, and the size of the imbibition is unclear. In addition, the common formation core is not in a saturated oil state but in an oil-gas-water three-phase or two-phase coexistence state, so that the water absorption volume is not necessarily equal to the oil displacement volume, and generally, the water absorption volume is larger than the oil displacement volume, so that the self-absorption oil displacement efficiency is larger through the calculation of the oil displacement efficiency. For example, CN109115993A discloses a device and a method for measuring spontaneous imbibition oil displacement efficiency of a low-permeability reservoir, which determine mass change of a core caused by water-oil density difference according to a weighing method, and calculate volume of water entering the core by self-absorption; and then, measuring the volume of the oil displaced from the rock core in the device and the volume of the oil contained in water by combining a volume method, determining that reasonable experimental data are obtained when the error of two experimental results is less than 3%, averaging the data obtained by the two experimental methods, and calculating the self-imbibition displacement oil efficiency through the data.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a novel water absorption and oil discharge device and a method for measuring the oil displacement efficiency.
In order to achieve the above object, one aspect of the present invention relates to a novel water absorption and oil discharge device.
The utility model provides a novel oil extraction device absorbs water, includes the detritus chamber, detritus chamber one end is sealed, and the other end is provided with the baffle, the one side that water containing device was connected through the sealing ring to the one end that the detritus chamber is close to the baffle, be equipped with two utensil plug devices on water containing device's another lateral wall respectively, all be provided with the oil content analysis appearance behind the utensil plug device, computer system is connected to the oil content analysis appearance.
Preferably, the water containing device is of a bottle body structure with a thick lower part and a thin upper part, the upper part of the bottle body is a neck part, scales are marked on the neck part, and the scales are gradually increased from top to bottom from 0.
Further, the core chamber is used for placing a core.
The invention also relates to a method for measuring the oil displacement efficiency by adopting the novel water absorption and oil drainage device.
The oil displacement efficiency measuring method comprises the following steps:
1) cutting the core into a cube capable of being placed in a core chamber, and measuring the porosity phi and the oil saturation s of the coreoCore m of weighing1；
2) Placing the core in a core chamber and connecting the core to one end of a sealing ring;
3) filling water into the water containing device to 0 scale, connecting the water containing device to the other end of the sealing ring, and removing the partition plate;
4) the core starts to self-absorb water, and the volume of the oil at the neck part of the water containing device is calculated to be V1Measuring the oil content in water by an oil content in water analyzer, and calculating the oil content volume V in water from the oil content in water and the volume of water in the container2Then, the volume V of water and oil is sucked and discharged3＝V1+V2；
5) Taking out the core, wiping and weighing m2Oven drying and weighing m3Calculating the water absorption volume V of the rock coreWater (W)＝(m2-m3)/ρWater (W)；
6) Since the core may not be 100% saturated oil, the water uptake volume may be greater than the oil production volume:
m1-ρoilVOil discharge+ρWater (W)VWater absorption＝m2
m1-ρOilVOil discharge+ρWater (W)VOil discharge+ρWater (W)(VWater absorption-VOil discharge)＝m2
(ρWater (W)-ρOil)VOil discharge+ρWater (W)(VWater absorption-VOil discharge)＝m2-m1
Wherein, VWater absorptionEqual to that in step 5VWater (W)So that V can be calculatedOil discharge；
Finally determining V by arithmetic mean method taking experimental error into accountOil discharge＝(V3+VOil discharge)/2；
Obtaining the core self-water-absorption oil-discharge efficiency as follows:
in a preferred embodiment of the invention, the core is cut to a volume of 1cm3The cube of (1).
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the novel water-absorbing oil-discharging device, only the side surface of the core is in contact with water, so that the influence of gravity on self-water-absorbing oil-discharging of the core is avoided, and the main power of water-absorbing oil-discharging of the core is determined to be capillary force;
(2) the device considers the oil suction and discharge efficiency of the rock core under the condition of incomplete saturated oil, and has wide applicability;
(3) the oil displacement efficiency measuring method provided by the invention combines a weighing method and a volume method, and considers the condition that the water absorption volume is larger than the oil discharge volume, so that the obtained oil displacement efficiency is more accurate.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of a novel water absorption and oil discharge device of the present invention;
reference numbers in the figures: 1-core chamber, 2-clapboard, 3-sealing ring, 4-water containing device, 5-plug device, 6-oil content analyzer, 7-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 invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, the novel water absorption and oil discharge device comprises a core chamber 1, wherein the core chamber 1 is used for placing a core, one end of the core chamber 1 is closed, the other end of the core chamber is provided with a partition plate 2, one end of the core chamber 1, which is close to the partition plate 2, is connected with one side of a water containing device 4 through a sealing ring 3, the other side wall of the water containing device is respectively provided with two plug devices 5, the water containing device 4 is of a bottle body structure with a thick lower part and a thin upper part, the upper part of the bottle body is a neck part, and the neck part is marked with scales which are gradually increased from top to bottom from 0; the device with the plug 5 is provided with an oil content analyzer 6 at the back, the oil content analyzer 6 monitors the oil content in the water of the water containing device 4 through the device with the plug 5, the oil content analyzer 6 is connected with a computer system 7, and data are recorded by the computer system 7 in a statistical mode.
The method for measuring the oil displacement efficiency by adopting the novel water absorption and oil discharge device comprises the following steps:
1) cutting the core into 1cm3The porosity phi of the measured core is 12%, and the oil saturation soAt 64%, core m was weighed12.035 g; in addition, the density ρ of waterw＝1.0g/cm3Measurement of crude oil Density ρo＝0.82g/cm3
2) Placing the core in the core chamber 1 and connecting the core to one end of the sealing ring 3;
3) the water containing device 4 is filled with water to the scale of 0 and is connected to the other end of the sealing ring 3, and the clapboard 2 is taken out;
4) the core begins to self-absorb water, and the volume of the oil at the neck part of the water containing device 4 is calculated to be V1This example V10.04ml the oil content in water was measured by using an oil content in water analyzer 6 to determine the oil content in water to be 0.2g/L and the water content in the vessel to be 1ml, and the oil content in water was calculated from the oil content in water and the volume of water in the vessel to be V20.2 × 0.001/0.82 ═ 0.00024ml, volume V of water and oil discharged3＝V1+V2＝0.04+0.00024＝0.04024ml；
5) Taking out the coreDry-off weighing machine2Is 2.096g, oven-dried and weighed m3The water absorption volume V of the rock core is calculated to be 2.010gWater (W)＝(m2-m3)/ρWater (W)＝0.086ml；
6) Since the core may not be 100% saturated oil, the water uptake volume may be greater than the oil production volume:
m1-ρoilVOil discharge+ρWater (W)VWater absorption＝m2
m1-ρOilVOil discharge+ρWater (W)VOil discharge+ρWater (W)(VWater absorption-VOil discharge)＝m2
(ρWater (W)-ρOil)VOil discharge+ρWater (W)(VWater absorption-VOil discharge)＝m2-m1
Wherein, VWater absorptionIs equal to V in step 5Water (W)Thereby calculating VOil discharge＝0.03049ml；
The experiments have certain errors, so that the V is finally determined by an arithmetic mean methodOil discharge＝(V3+VOil discharge)/2＝0.0354ml；
Obtaining the core self-water-absorption oil-discharge efficiency as follows:
the foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. The utility model provides a novel oil extraction device absorbs water, a serial communication port, including the core room, core room one end is sealed, and the other end is provided with the baffle, the core room is close to one side that the one end of baffle passes through the sealing ring and connects flourishing water installation, be equipped with two utensil plug devices on another lateral wall of flourishing water installation respectively, all be provided with the oil content analysis appearance behind the utensil plugging device, the oil content analysis appearance connects computer system.
2. The novel water absorption and oil discharge device as claimed in claim 1, wherein the water storage device is a bottle structure with a thick lower part and a thin upper part, the upper part of the bottle body is a neck part, the neck part is marked with scales, and the scales are gradually increased from top to bottom from 0.
3. The novel water absorption and oil drainage device as claimed in claim 1, wherein the core chamber is used for placing a core.
4. The method for measuring the oil displacement efficiency by adopting the novel water absorption and oil drainage device as claimed in any one of claims 1 to 3 is characterized by comprising the following steps:
1) cutting the core into a cube capable of being placed in a core chamber, and measuring the porosity phi and the oil saturation s of the coreoCore m of weighing1；
2) Placing the core in a core chamber and connecting the core to one end of a sealing ring;
3) filling water into the water containing device to 0 scale, connecting the water containing device to the other end of the sealing ring, and removing the partition plate;
4) the core starts to self-absorb water, and the volume of the oil at the neck part of the water containing device is calculated to be V1Measuring the oil content in water by an oil content in water analyzer, and calculating the oil content volume V in water from the oil content in water and the volume of water in the container2Then, the volume V of water and oil is sucked and discharged3＝V1+V2；
5) Taking out the core, wiping and weighing m2Oven drying and weighing m3Calculating the water absorption volume V of the rock coreWater (W)＝(m2-m3)/ρWater (W)；
6) Since the core may not be 100% saturated oil, the water uptake volume may be greater than the oil production volume:
m1-ρoilVOil discharge+ρWater (W)VWater absorption＝m2
m1-ρOilVOil discharge+ρWater (W)VOil discharge+ρWater (W)(VWater absorption-VOil discharge)＝m2
(ρWater (W)-ρOil)VOil discharge+ρWater (W)(VWater absorption-VOil discharge)＝m2-m1
Wherein, VWater absorptionIs equal to V in step 5Water (W)So that V can be calculatedOil discharge；
Finally determining V by arithmetic mean method taking experimental error into accountOil discharge＝(V3+VOil discharge)/2；
Obtaining the core self-water-absorption oil-discharge efficiency as follows:
5. the method of measuring oil displacement efficiency according to claim 4, wherein the core is cut into a volume of 1cm3The cube of (1).
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