CN110715887B - Method for measuring porosity of bituminous sand - Google Patents
Method for measuring porosity of bituminous sand Download PDFInfo
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- CN110715887B CN110715887B CN201810763149.3A CN201810763149A CN110715887B CN 110715887 B CN110715887 B CN 110715887B CN 201810763149 A CN201810763149 A CN 201810763149A CN 110715887 B CN110715887 B CN 110715887B
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- 239000004576 sand Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 claims abstract description 47
- 238000005406 washing Methods 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 34
- 239000010426 asphalt Substances 0.000 claims abstract description 20
- 239000011275 tar sand Substances 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 17
- 239000003960 organic solvent Substances 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 239000011269 tar Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 abstract description 37
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 239000011148 porous material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000001225 nuclear magnetic resonance method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004852 Asphaltite Substances 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 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
- 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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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Abstract
The invention provides a method for measuring the porosity of bituminous sand, which is implemented by adopting a device for measuring the porosity of bituminous sand, and the device comprises the following steps: the device comprises a sample mold, a sample preparation mold, a pressurizing and fixing box, two plugs, a pressurizing system and an oil washing instrument, wherein the sample mold is accommodated in the sample preparation mold, the sample preparation mold is accommodated and fixed in the pressurizing and fixing box, the plugs are used for plugging two ends of the sample mold filled with asphalt sand sample particles, an opening is formed in one end of the pressurizing and fixing box, a pressurizing end of the pressurizing system extends into the opening and applies mechanical force to one of the plugs, and the oil washing instrument is used for washing oil to the pressurized asphalt sand sample particles. The invention can accurately obtain the total volume after the bituminous sand (rock) is injection-molded under the formation pressure, can wash oil in batches based on the action of the sample mold, ensures no particle loss, and can obtain the accurate framework volume, thereby providing accurate porosity data, and having high precision and high efficiency.
Description
Technical Field
The invention belongs to the field of oil-gas exploration, and particularly relates to a method for measuring the porosity of bituminous sand (also applicable to bituminous rock).
Background
Rock porosity refers to the percentage of the pore volume in the total volume of a rock sample, and if any two of the three parameters of the total volume of the rock, the pore volume and the skeleton volume can be measured, the porosity can be calculated.
For rocks with good cementation degree, the porosity can be obtained conveniently, and the main method comprises the following steps: three methods, namely a measurement method, a liquid method and a gas method, but loose samples like tar sands (rocks) are difficult to obtain the porosity. The asphalt sand (rock) refers to sand (rock) formed by cementing asphalt filled pores, and the porosity of the sand (rock) is one of key parameters for calculating the asphalt reserves. To obtain the porosity parameter, the bitumen in the rock sample must be washed away with an organic solvent, but after the bitumen is washed away, the rock sample becomes loose sand and does not meet the porosity test conditions.
At present, the freezing coring is generally adopted to obtain the bituminous sand (rock) plunger sample, the total volume is calculated according to the length and the diameter, but because the consolidation degree of the bituminous sand is poor, a sample with a smooth end face is difficult to cut out, the total volume error is large, and the serious deviation of the porosity is caused. In addition, loose sand after oil washing is easily lost when being transferred to a sample cup, and further contributes to porosity errors.
The porosity determination method for loose materials such as bituminous sand (rock) mainly comprises the following steps: microscopic imaging (e.g., patent 201210364652.4) and nuclear magnetic resonance (e.g., patent 201610243039.5). The microscopic imaging method is limited by the resolution of the image, with large samples resulting in low resolution and small samples resulting in poor representativeness. Although the nuclear magnetic resonance method can obtain the porosity and the oil saturation in one step, the nuclear magnetic resonance method does not directly measure the porosity and the oil saturation, and needs to be converted by an empirical formula, so that a large error still exists.
Therefore, the following two requirements need to be met in order to accurately test the porosity of the bituminous sand (rock):
(1) accurately obtaining the total volume of the tar sands (rocks);
(2) the oil washing is convenient, and the rock sample after oil washing can be transferred without damage, and the volume of the particle framework can be conveniently tested.
In view of the above, the inventor of the present application provides a method for measuring the porosity of tar sand, so as to solve the problem of accurately measuring the porosity of tar sand (rock) with poor cementation degree, and improve the efficiency and the accuracy by optimizing the sample preparation and oil washing steps.
Disclosure of Invention
The invention aims to provide a method for measuring the porosity of bituminous sand (also applicable to bituminous rock) so as to solve the problem of accurately measuring the porosity of bituminous sand (rock) with poor cementation degree and improve the efficiency and the precision by optimizing sample preparation and oil washing steps.
In order to achieve the above object, the present invention provides an apparatus for measuring porosity of tar sand, comprising: the device comprises a sample mold, a sample preparation mold, a pressurizing and fixing box, two plugs, a pressurizing system and an oil washing instrument, wherein the sample mold is accommodated in the sample preparation mold, the sample preparation mold is accommodated and fixed in the pressurizing and fixing box, the plugs are used for plugging two ends of the sample mold filled with asphalt sand sample particles, an opening is formed in one end of the pressurizing and fixing box, a pressurizing end of the pressurizing system extends into the opening and applies mechanical force to one of the plugs, and the oil washing instrument is used for washing oil to the pressurized asphalt sand sample particles.
The bituminous sand porosity measuring device, wherein, the sample mould includes the drum and cooperates two end covers of installing at the drum both ends respectively, and the center of every end cover all is provided with an opening.
The asphalt sand porosity measuring device is characterized in that external threads are arranged at two ends of the cylinder, matched internal threads are arranged on the inner side of each end cover, and the two end covers are in threaded connection with the cylinder respectively.
The asphalt sand porosity measuring device is characterized in that the outer surface of the cylinder is engraved with a number for identification.
The asphalt sand porosity measuring device is characterized in that the sample preparation mold is dumbbell-shaped, a hollow cylindrical inner groove is formed in the sample preparation mold along the extension direction of the sample preparation mold, and the diameter of the cylindrical inner groove is equal to the outer diameter of a cylinder of the sample mold.
The asphalt sand porosity determination device is characterized in that the pressurizing fixing box is a rectangular box body and is provided with a dumbbell-shaped inner groove which is completely matched with the outside of the sample preparation mold.
The asphalt sand porosity measuring device is characterized in that a metal screen and filter paper are sequentially arranged between the end covers at two ends of the sample mold and the sample during oil washing.
The bituminous sand porosity measuring device is characterized in that the sample module, the sample preparation module and the pressurizing fixing box are all made of stainless steel.
The invention also provides a determination method implemented by adopting the asphalt sand porosity determination device, which comprises the following steps:
firstly, removing end covers at two ends of a sample mould, placing the end covers in a sample preparation mould, filling the sample mould with crushed asphalt sand sample particles, and placing plugs at two ends of the sample mould respectively;
secondly, applying mechanical force to one plug close to the pressurizing end of the pressurizing system by the pressurizing end of the pressurizing system, wherein the other plug extends out of the sample preparation mould and abuts against the other end, far away from the pressurizing system, of the inside of the pressurizing fixing box;
Thirdly, releasing pressure after maintaining constant pressure for preset time, ejecting a sample die, cutting off redundant samples at two ends of the sample die until the end faces are flat, firstly padding filter paper on the end faces of the samples, then installing a metal screen, screwing an end cover, and then putting the samples into an oil washing instrument for washing oil by using an organic solvent;
fourthly, after the oil washing is finished, all samples are taken out, after the organic solvent is volatilized, the sample mold with the sample particles inside is taken out for the determination of the skeleton volume, and the porosity is measured
And (3) calculating:
wherein the total volume of the sample mold, the metal screen and the filter paper is V0；
The internal volume of the sample mold, i.e. the total volume of the bituminous sand (rock), is V1；
The volume of the particle skeleton is as follows: v2-V0。
In the fourth step, the total volume of the sample mold, the metal screen and the filter paper is measured by using a gas method, and the particle skeleton volume and the total volume of the sample mold, the metal screen and the filter paper are measured by using a gas method.
In conclusion, the beneficial effects of the invention are as follows: the method mainly solves the problem of accurate determination of the porosity of the bituminous sand (rock) with poor cementation degree, and improves the efficiency and the precision through the optimization of sample preparation and oil washing steps. The sample preparation device comprises a sample mold, a sample preparation mold and a pressurizing fixing box, the total volume can be accurately obtained after the bituminous sand (rock) is subjected to injection molding under the formation pressure, oil can be washed in batches based on the effect of the sample mold, no particle loss is guaranteed, the accurate framework volume can be obtained, accurate porosity data can be provided, and the sample preparation device is high in precision and efficiency.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the drawings. Wherein:
FIG. 1 is a schematic view showing the construction of an apparatus for measuring the porosity of tar sand according to the present invention;
fig. 2 is an exploded schematic view of a sample mold.
In the drawings, like parts are given like reference numerals. The drawings are not to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and fig. 2, which are respectively a schematic structural diagram of a tar sand porosity measuring apparatus according to the present invention and an exploded schematic diagram of a sample mold. The invention provides a device for measuring the porosity of bituminous sand (also applicable to bituminous rock), which mainly comprises: a sample mold 1, a sample preparation mold 2, a pressurizing and fixing box 3, two plugs 4, a pressurizing system 5 and an oil washing instrument (not shown in the figure).
Wherein the sample mold 1 comprises: a cylinder 11 and two end covers 12 respectively matched and installed at two ends of the cylinder 11. Specifically, both ends of the cylinder 11 are provided with external threads, the inner side of each end cover 12 is provided with matched internal threads, and the two end covers 12 can be respectively in threaded connection with the cylinder 11. The outer surface of the cylinder 11 may be engraved with a number for identification. In addition, each end cap 12 is provided with an opening 121 at the center thereof, so that when filling and pressurizing the crushed sample particles of tar sands (rocks), a part of the sample particles of tar sands (rocks) outside the sample mold 1 can be squeezed into the sample mold 1, and the sample in the sample mold 1 is compacted. Preferably, the sample module 1 can be made of stainless steel. The plugs 4 are used for plugging two ends of the sample mould 1 filled with the asphalt sand (rock) sample particles, and the plugs 4 can also be made of stainless steel,
The sample preparation mold 2 is used for accommodating the sample mold 1. Specifically, the sample preparation mold 2 is dumbbell-shaped and has a structure with large outer diameters at two ends and a small outer diameter in the middle. The sampling mold 2 has a hollow cylindrical inner groove 21 along its extending direction, and the diameter of the cylindrical inner groove 21 is equal to the outer diameter of the cylinder 11 of the sample mold 1 so that the sample mold 1 can be placed in the sampling mold 2. Preferably, the sample preparation module 2 can also be made of stainless steel.
The pressurizing and fixing box 3 is used for accommodating the sample preparation mold 2 and can fix the sample preparation mold therein. Specifically, the pressurizing fixing box 3 is a rectangular box body, and it has a dumbbell-shaped inner groove 31 completely matching with the outside of the sample-making mold 2, so that when the sample-making mold 2 is loaded into the pressurizing fixing box 3, the sample-making mold 2 can be clamped, preventing the sample-making mold 2 from moving. Preferably, the pressing and fixing box 3 can also be made of stainless steel.
An opening is provided at one of the ends of the pressure fixation capsule 3 for allowing a pressure end of a pressure system 5 (not shown in detail) to extend from the opening and apply a mechanical force to one of the plugs 4.
The working principle of the invention is as follows: the end covers 12 at two ends of the sample mould 1 are detached and placed in the sample preparation mould 2, the sample mould 1 is filled with crushed bituminous sand (rock) sample particles, and the two ends of the sample mould 1 are respectively provided with a plug 4. It should be noted that some of the escaping sample particles 6 may remain between the sample mold 1 and the stopper 4. The pressurizing end of the pressurizing system 5 applies mechanical force to one plug 4 facing the pressurizing system, and the other plug 4 extends out of the sample preparation mold 2 and abuts against the other end, far away from the pressurizing system 5, in the pressurizing fixing box 3. The applied mechanical force is set according to the depth of the formation, the depth of the formation is proportional to the applied mechanical force (for example, when the tar sand (rock) sample is taken 1000 meters under the formation, a pressure of about 15MPa is applied to the tar sand (rock) sample), the pressure is released after maintaining a constant pressure for a predetermined time (for example, 20 minutes to 60 minutes), the sample mold 1 is ejected, the excess sample at both ends of the sample mold 2 is cut off until the end face is flat, filter paper is first laid on the end face of the sample, then a metal screen (preferably a stainless steel screen) is installed, the end cap 12 is screwed on, and then the sample mold is put into an oil washing instrument (not shown in the figure) to be washed with an organic solvent.
After making a plurality of samples, with the help of the serial number sign on sample mould drum surface, can carry out sample wash oil in batches, treat after the wash oil, take out whole samples, treat that organic solvent volatilizees the back, take out the sample mould that inside was equipped with the sample granule and carry out skeleton volume survey, specifically do:
measuring the total volume V of the sample mold, the metal screen and the filter paper by adopting a gas method0The internal volume of the sample mold 1, i.e. the total volume V of the tar sand (rock)1After oil washing, the particle framework volume and V were determined by gas method0Volume V including volume2The volume of the particle skeleton is as follows: v2-V0Then porosity is increased
The invention also provides a method for measuring the porosity of the bituminous sand (also applicable to the asphaltite), which mainly comprises the following steps:
firstly, detaching end covers 12 at two ends of a sample mould and placing the end covers in a sample preparation mould 1, filling the sample mould with crushed bituminous sand (rock) sample particles and respectively placing a plug at two ends of the sample mould 1;
secondly, applying mechanical force to one plug 4 close to the pressurizing end of the pressurizing system 5 by the pressurizing end of the pressurizing system 5, wherein the other plug 4 extends out of the sample preparation mould 2 and is propped against the other end, far away from the pressurizing system 5, in the pressurizing fixing box 3;
The applied mechanical force is set according to the depth of the formation, which is proportional to the applied mechanical force (e.g., about 15MPa of pressure is applied to the tar sands sample when it is taken 1000 meters below the formation);
thirdly, releasing pressure after maintaining constant pressure for a period of time, ejecting the sample mold 1, cutting off redundant samples at two ends of the sample mold 2 until the end faces are flat, firstly padding filter paper on the end faces of the samples, then installing a metal screen, screwing an end cover 12, and then putting the samples into an oil washing instrument (not shown in the figure) for washing oil by using an organic solvent;
after a plurality of samples are manufactured, the serial number marks on the surface of the sample mould cylinder can be used for washing oil for the samples in batches;
fourthly, after the oil washing is finished, all samples are taken out, and after the organic solvent is volatilized, the sample mold with the sample particles inside is taken out to measure the volume of the framework, which specifically comprises the following steps:
measuring the total volume V of the sample mold, the metal screen and the filter paper by adopting a gas method0The internal volume of the sample mold 1, i.e. the total volume V of the tar sand (rock)1After washing the oil, the particle skeleton volume and V were determined by gas method0Volume V including volume2The volume of the particle skeleton is as follows: v2-V0Then porosity is increased
Examples：
The sample mould is stainless steel's drum, and external diameter phi 25mm, internal diameter phi 20mm, height 25mm, both ends are M3 external screw thread, and the drum surface is carved with the number that is used for the sign, and the drum is furnished with circular lid, and external diameter phi 25mm, height are 5mm, and processing M3 internal thread has diameter phi 18mm round hole in the middle of the lid processing for organic solvent circulation leaching when washing oil.
The sample preparation mold is made of stainless steel and is a long strip-shaped cylinder, the length of the sample preparation mold is 100mm, the two ends of the outer diameter are thick (phi 80mm), the middle part is thin (phi 50mm), and the inner diameter is consistent (phi 25 mm).
The length of the pressurizing fixing box is 300mm, the inner width of the pressurizing fixing box is consistent with the outer diameters of two ends of the sample preparation mold, two separating blocks are arranged in the middle of the pressurizing fixing box, the height of the separating blocks is about 15mm, and the pressurizing fixing box is used for clamping the sample preparation mold.
Molding and washing oil:
removing covers at two ends of a sample mould, then loading the sample mould into a sample preparation mould, filling crushed sample particles of the tar sand (rock) until the sample particles are full, plugging a stainless steel plunger plug, then placing the sample mould into a pressurizing fixing box, setting applied mechanical force according to the depth of the stratum, releasing pressure after maintaining constant pressure for a period of time, ejecting the sample mould, cutting redundant samples at two ends of the sample mould until the end surfaces are flat, then padding filter paper and a metal screen, screwing the covers, and then placing the sample mould into an oil washing instrument for oil washing. After a plurality of samples are manufactured, batch sample washing oil can be carried out by means of the serial number marks on the surface of the sample mold cylinder, after the washing oil is finished, all samples are taken out to be dissolved out by an organic solvent, and the sample mold with sample particles in the sample mold is taken out to carry out skeleton volume determination.
And (3) porosity determination:
measuring the solid volume V of the sample mold, the metal screen and the filter paper by adopting a gas method 0Internal volume of mould, sample mould, i.e. total volume V of bituminous sand (rock)1After oil washing, measuring the volume V2 including the particle framework volume and the volume V0 by using a gas method, wherein the particle framework volume is as follows: v2-V0Then porosity of
In conclusion, the beneficial effects of the invention are as follows: the method mainly solves the problem of accurate determination of the porosity of the bituminous sand (rock) with poor cementation degree, and improves the efficiency and the accuracy through the optimization of sample preparation and oil washing steps. The sample preparation device comprises a sample mould, a sample preparation mould and a pressurizing fixing box, the total volume can be accurately obtained after the injection molding of the tar sand (rock) under the stratum pressure, and the accurate framework volume can be obtained based on the effect of the sample mould, the oil can be washed in batches and no particle loss can be ensured, so that the accurate porosity data can be provided, and the sample preparation device is high in precision and efficiency.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A method for measuring the porosity of tar sand by using a device for measuring the porosity of tar sand, characterized in that the device for measuring the porosity of tar sand comprises: the device comprises a sample mold, a sample preparation mold, a pressurizing and fixing box, two plugs, a pressurizing system and an oil washing instrument, wherein the sample mold is accommodated in the sample preparation mold, the sample preparation mold is accommodated and fixed in the pressurizing and fixing box, the plugs are used for plugging two ends of the sample mold filled with asphalt sand sample particles, one end of the pressurizing and fixing box is provided with an opening, a pressurizing end of the pressurizing system extends into the opening and applies mechanical force to one of the plugs, and the oil washing instrument is used for washing oil on the pressurized asphalt sand sample particles;
the method for measuring the porosity of the tar sand comprises the following steps:
firstly, removing end covers at two ends of a sample mould and placing the end covers in a sample preparation mould, filling the sample mould with crushed asphalt sand sample particles, and respectively placing plugs at two ends of the sample mould;
secondly, applying mechanical force to one plug close to the pressurizing end of the pressurizing system by the pressurizing end of the pressurizing system, wherein the other plug extends out of the sample preparation mould and abuts against the other end, far away from the pressurizing system, of the inside of the pressurizing fixing box;
Thirdly, releasing pressure after maintaining constant pressure for a preset time, ejecting a sample die, cutting off redundant samples at two ends of the sample die until the end faces are flat, firstly padding filter paper on the end faces of the samples, then installing a metal screen, screwing an end cover, and then putting the samples into an oil washing instrument for washing oil by using an organic solvent;
fourthly, after the oil washing is finished, all samples are taken out, after the organic solvent is volatilized, the sample mold with the sample particles inside is taken out for the determination of the skeleton volume, and the porosity is measured
And (3) calculating:
wherein the total volume of the sample mold, the metal screen and the filter paper is V0；
The internal volume of the sample mold, i.e. the total volume of the tar sand, is V1；
The total volume of the particle skeleton, the sample mold, the metal screen and the filter paper is V2；
The volume of the particle skeleton is as follows: v2-V0。
2. The method for measuring the porosity of tar sand according to claim 1, wherein the total volume of the sample mold, the metal screen, and the filter paper is measured by a gas method, and the total volume of the sample mold, the metal screen, and the filter paper is measured by a gas method.
3. The method for measuring the porosity of the tar sand performed by the apparatus for measuring the porosity of the tar sand according to claim 1, wherein the sample mold comprises a cylinder and two end caps respectively fitted to both ends of the cylinder, and each end cap has an opening at the center.
4. The method for measuring the porosity of tar sand by using the device for measuring the porosity of tar sand as claimed in claim 3, wherein the cylinder has external threads at both ends thereof, and each end cap has internal threads at the inner side thereof, and the two end caps are respectively in threaded connection with the cylinder.
5. The method of claim 3, wherein the cylinder is marked with a numerical code on its outer surface for identification.
6. The method of measuring porosity of tar sand according to claim 3, wherein the sample preparation mold has a dumbbell shape, and the sample preparation mold has a hollow cylindrical inner tank along the extending direction thereof, and the diameter of the cylindrical inner tank is equal to the outer diameter of the cylinder of the sample mold.
7. The method of measuring porosity of tar sand according to claim 1, wherein the pressure fixing box is a rectangular box and has a dumbbell-shaped inner groove that fits completely with the outside of the sample preparation mold.
8. The method for measuring the porosity of tar sands by using the device for measuring the porosity of tar sands as claimed in claim 3, wherein a metal screen and a filter paper are sequentially disposed between the sample and the end caps at both ends of the sample mold during oil washing.
9. The method for measuring the porosity of tar sand according to claim 3, wherein the sample module, the sample preparation module and the pressurizing and fixing box are made of stainless steel.
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