CN108918214B - Conglomerate sample preparation method for core analysis and conglomerate sample for core analysis - Google Patents
Conglomerate sample preparation method for core analysis and conglomerate sample for core analysis Download PDFInfo
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- CN108918214B CN108918214B CN201810473636.6A CN201810473636A CN108918214B CN 108918214 B CN108918214 B CN 108918214B CN 201810473636 A CN201810473636 A CN 201810473636A CN 108918214 B CN108918214 B CN 108918214B
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Abstract
The invention provides a conglomerate sample preparation method for core analysis and a conglomerate sample for core analysis, and relates to the field of laboratory core analysis, wherein the preparation method comprises the following steps: step 1, observing a conglomerate core to be detected, and determining two end surfaces of the conglomerate core; step 2, embedding the epoxy resin outside the conglomerate core and curing to form a first epoxy resin protective sleeve; step 3, cutting two ends of the conglomerate core along a direction parallel to the end face, and enabling two ends of the conglomerate core to expose fresh cores respectively to form core cutting faces; step 4, respectively installing a flow guide device on the two core cutting surfaces, wherein the flow guide device comprises a flow guide sheet and a flow guide joint; and 5, embedding the epoxy resin outside the first epoxy resin protective sleeve and the two flow deflectors and curing to form a second epoxy resin protective sleeve. The invention can effectively prevent the problems of particle falling, cracking and the like of the conglomerate sample in the experimental process, and provides technical support for conglomerate reservoir evaluation and seepage mechanism.
Description
Technical Field
The invention relates to the field of laboratory core analysis, in particular to a conglomerate sample preparation method for core analysis and a conglomerate sample for core analysis.
Background
As an important type of oil and gas reservoirs in China, conglomerates are main objects of research of geologists, and particularly recently, with the discovery of large conglomerate oil areas in the Marlake region of the Quaschar basin and the northeast sunken conglomerate scale reserve areas in the Bohai Bay basin, a coarse grain deposition system taking the conglomerates as the core becomes an important research field.
The core analysis is the basis of reservoir evaluation, and from laboratory research, the core analysis mainly comprises physical property analysis, oil saturation analysis, phase permeability experimental analysis and the like, so that the core analysis result is not only an important basis favorable for reservoir optimization, but also has general attention in relation to oil and gas resource evaluation.
At present, a sample required by core analysis has a regular shape, and is generally a small cylinder with the diameter of 2.54cm or 3.8cm according to the standard SY/T5336-one 2006 in the oil and gas industry. The conglomerate reservoir is different from the conventional sandstone reservoir, the conglomerate reservoir is loose due to large granularity and high argillaceous foreign base content, the problems of particle falling, breakage and the like are easily caused, the plunger sample with the diameter of 2.54cm or 3.8cm is extremely difficult to prepare, and the confining pressure cannot be loaded in the experimental process, so that the problem of conglomerate evaluation is solved by how to prepare the sample meeting the core analysis requirement.
The currently mainstream method for manufacturing a conglomerate sample by cementing the sample with a specific chemical substance, wherein the commonly used cementing agent comprises epoxy resin, 502 glue or paraffin wax, the operation process is relatively simple, generally, the sample is placed in the cementing agent, and after the cementing agent is completely cured, the sample is taken out for sample analysis. However, the above method has a great disadvantage:
firstly, the cementing agent has strong permeability to a sample, particularly 502 glue and paraffin, and a part of pore throat space can be blocked after the cementing agent enters the sample, so that a core analysis result is influenced;
secondly, the cementing agent carries out comprehensive curing treatment on the sample, and the mechanical properties of the cementing agent and the core are different, so that the end face of the core is easy to crack under the action of stress. The embedding effect of epoxy resin on a sample is better than that of 502 glue and paraffin, but when the sample is subjected to an oil-water displacement experiment after the epoxy resin is embedded, due to the fact that the two ends of the holder are rigid plugs, the epoxy resin and the rock core on the end face can be displaced and deformed in different scales under the high-pressure condition, and the sample is damaged.
Based on the above, the present invention aims to create a conglomerate sample preparation method for core analysis and a conglomerate sample for core analysis, so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to provide a conglomerate sample preparation method for core analysis and a conglomerate sample for core analysis, which can effectively prevent the problems of particle falling, cracking and the like of the conglomerate sample in the experimental process and provide technical support for conglomerate reservoir evaluation and seepage mechanism.
In order to achieve the above object, the present invention provides a conglomerate sample preparation method for core analysis, wherein the preparation method comprises:
step 1, observing a conglomerate core to be detected, and determining two end surfaces of the conglomerate core, wherein the two end surfaces are arranged in parallel;
step 2, embedding epoxy resin outside the conglomerate core and curing to form a first epoxy resin protective sleeve;
step 3, cutting two ends of the conglomerate rock core along a direction parallel to the end face, and enabling two ends of the conglomerate rock core to expose fresh rock cores respectively to form rock core cutting faces;
step 4, respectively installing a flow guide device on the two rock core cutting surfaces, wherein the flow guide device comprises a flow guide sheet and a flow guide joint, one surface of the flow guide sheet is fixedly connected with the rock core cutting surfaces, the other surface of the flow guide sheet is fixedly provided with the flow guide joint, and the flow guide sheet is provided with a through hole communicated with the flow guide joint;
and 5, embedding epoxy resin outside the first epoxy resin protective sleeve and the two flow deflectors and curing to form a second epoxy resin protective sleeve, wherein the flow guide joint penetrates through the second epoxy resin protective sleeve.
The conglomerate sample preparation method for core analysis as described above, wherein step 1 further includes measuring the end face to obtain a diameter of a maximum circumscribed circle of the end face.
The conglomerate sample preparation method for core analysis as described above, wherein the first epoxy protective casing has an outer diameter greater than 2mm of the diameter of the largest circumscribed circle.
The conglomerate sample preparation method for core analysis comprises the steps that the flow deflector is in a wafer shape, and the diameter of the flow deflector is 60% -80% of the outer diameter of the first epoxy resin protective sleeve.
The conglomerate sample preparation method for core analysis as described above, wherein the step 2 comprises:
step 21, melting the epoxy resin at 120 ℃, cooling to 20 ℃, and injecting into a primary embedding container;
step 22, adding a curing agent into the epoxy resin, and uniformly stirring;
step 23, putting the conglomerate core into the primary embedding container, enabling the end face of the conglomerate core to be perpendicular to the axis of the primary embedding container, and ensuring that the conglomerate core is completely immersed by epoxy resin;
and 24, curing the epoxy resin at normal temperature to form the first epoxy resin protective sleeve, wherein the curing time is 48 hours.
The conglomerate sample preparation method for core analysis as described above, wherein in step 3, jet fuel is used as a cooling medium when cutting; and after cutting, wiping off the aviation kerosene on the cutting surface of the rock core by using filter paper, and then placing the cut conglomerate rock core in an oven, wherein the temperature of the oven is set to be 70 ℃, and the heating time of the oven is 15 minutes.
The conglomerate sample preparation method for core analysis as described above, wherein, in step 4, the outer edge of the flow deflector is sealingly connected to the core cutting surface or the first epoxy protective casing by a sealing glue.
The method for preparing the conglomerate sample for core analysis comprises the steps that the highest tolerance temperature of the sealing glue is not lower than 120 ℃, and the highest tolerance pressure of the sealing glue is not lower than 50 MPa.
The conglomerate sample preparation method for core analysis comprises the step of fixedly connecting the flow deflector with the cutting surface of the core through a fixing screw.
The invention also provides a conglomerate sample for core analysis, which is prepared by the preparation method of the conglomerate sample for core analysis, wherein the conglomerate sample for core analysis comprises the following components in sequence from inside to outside:
the conglomerate core is columnar, two ends of the conglomerate core are respectively provided with a flow deflector, the flow deflectors are arranged along an axis perpendicular to the conglomerate core, the flow deflectors are provided with a first surface facing the conglomerate core and a second surface facing away from the conglomerate core, the first surface is fixedly connected with the end face of the conglomerate core, a flow guide joint is fixedly arranged on the second surface, the flow guide joint is tubular and provided with a flow guide cavity communicated along the axis of the flow guide joint, and the flow deflector is provided with a through hole correspondingly matched with the flow guide joint;
the first epoxy resin protective sleeve is sleeved outside the conglomerate core, and the inner wall of the first epoxy resin protective sleeve is hermetically connected with the outer wall of the conglomerate core;
the second epoxy resin protective sleeve is sleeved outside the first epoxy resin protective sleeve, the inner wall of the second epoxy resin protective sleeve is hermetically connected with the outer wall of the first epoxy resin protective sleeve, two ends of the second epoxy resin protective sleeve are sealed to form a plugging portion, the plugging portion is hermetically connected with the flow deflector, and the flow guide connector penetrates through the plugging portion.
Compared with the prior art, the invention has the following characteristics and advantages:
according to the conglomerate sample preparation method for core analysis and the gravel sample for core analysis, the conglomerate core is basically protected by the first epoxy resin protective sleeve, the diversion device and the conglomerate core are completely embedded and combined together by the second epoxy resin protective sleeve, and the pressure bearing surface of the prepared conglomerate sample is completely made of epoxy resin, so that the diversion device and the conglomerate core are stressed consistently, the mechanical balance of the whole system is ensured, and the sample is effectively prevented from being broken in the high-pressure test process.
The conglomerate sample preparation method for core analysis provided by the invention is used for carrying out early-stage treatment on the conglomerate core which has higher clay impurity base and coagulated ash content, is easy to loosen, drop or is already broken, can effectively prevent the problems of dropping, breaking and the like of the conglomerate sample in the experimental process, and provides technical support for conglomerate reservoir evaluation and seepage mechanism.
According to the conglomerate sample preparation method for core analysis, the flow deflector is fixedly arranged on the cutting surface of the core, the pressure of fluid is uniformly dispersed by the flow deflector, the fluid pressure is prevented from directly acting on the loose and easily-fractured cutting surface of the core, and the conglomerate core is prevented from being damaged in the experimental process to the maximum extent.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
FIG. 1 is a flow chart of a conglomerate sample preparation method for core analysis in accordance with the present invention;
FIG. 2 is a schematic diagram of the structure of a conglomerate sample for core analysis in accordance with the present invention;
FIG. 3 is a cross-sectional view of a conglomerate sample for core analysis in accordance with the present invention;
fig. 4 is a longitudinal sectional view of a conglomerate sample used for core analysis in accordance with the present invention.
Description of reference numerals:
100. conglomerate samples for core analysis; 10. Conglomerate core;
20. a first epoxy protective sleeve; 30. A second epoxy protective sleeve;
40. a flow deflector; 50. A flow guide joint;
60. and fixing the screw.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
As shown in fig. 1, the method for preparing a conglomerate sample for core analysis proposed by the present invention comprises:
step 1, observing a conglomerate core 10 to be measured, and determining two end surfaces (an inlet end surface and an outlet end surface) of the conglomerate core 10, wherein the two end surfaces are arranged in parallel;
step 2, embedding the epoxy resin outside the conglomerate core 10 and curing to form a first epoxy resin protective sleeve 20;
step 3, cutting two ends of the conglomerate core 10 along a direction parallel to the end face, and enabling two ends of the conglomerate core 10 to expose fresh cores respectively to form core cutting faces;
step 4, respectively installing a flow guide device on the two rock core cutting surfaces, wherein the flow guide device comprises a flow guide sheet 40 and a flow guide joint 50, so that one surface of the flow guide sheet 40 is fixedly connected with the rock core cutting surfaces, the other surface of the flow guide sheet 40 is fixedly provided with the flow guide joint 50, and the flow guide sheet 40 is provided with a through hole communicated with the flow guide joint 50;
and 5, embedding epoxy resin outside the first epoxy resin protective sleeve 20 and the two flow deflectors 40 and curing to form a second epoxy resin protective sleeve 30, wherein the flow guide joint 50 penetrates through the second epoxy resin protective sleeve 30.
According to the conglomerate sample preparation method for core analysis, the first epoxy resin protective sleeve 20 is used for basically protecting the conglomerate core 10, the second epoxy resin protective sleeve 30 is used for completely embedding and combining the diversion device and the conglomerate core 10 together, and the pressure bearing surface of the prepared conglomerate sample is completely made of epoxy resin, so that the diversion device and the conglomerate core are stressed consistently, the mechanical balance of the whole system is guaranteed, and the sample is effectively prevented from being broken in the high-pressure test process.
The conglomerate sample preparation method for core analysis provided by the invention is used for carrying out early-stage treatment on the conglomerate core which has higher clay impurity base and coagulated ash content, is easy to loosen, drop or is already broken, can effectively prevent the problems of dropping, breaking and the like of the conglomerate sample in the experimental process, and provides technical support for conglomerate reservoir evaluation and seepage mechanism.
According to the conglomerate sample preparation method for core analysis, the flow deflector 40 is fixedly arranged on the cutting surface of the core, the pressure of fluid is uniformly dispersed by the flow deflector 40, the fluid pressure is prevented from directly acting on the loose and easily-fractured cutting surface of the core, and the conglomerate core is prevented from being damaged in the experimental process to the maximum extent.
In an optional example of the present invention, in step 1, the specific operation process of observing the conglomerate core to be measured and determining the two end surfaces (the inlet end and the outlet end) of the conglomerate core may be implemented according to the specific core analysis project requirement and the standard requirement of the oil and gas industry, by using the prior art, and details are not described herein.
In an alternative example of the present invention, step 1 further includes measuring the core size of the end face of the conglomerate core by using a vernier caliper to obtain the diameter of the maximum circumscribed circle of the end face.
Further, the size of the container (the first-stage embedding container and the second-stage embedding container) for embedding the epoxy resin is determined according to the diameter of the maximum circumscribed circle, the first-stage embedding container and the second-stage embedding container are both containers with cylindrical accommodating cavities, the diameters of the accommodating cavities can be adjusted, and the adjusting range of the diameters of the accommodating cavities is 2 cm-10 cm. Wherein, the inner diameter of the containing cavity of the first-stage embedding container is 2mm larger than the diameter of the maximum circumscribed circle (in this way, the outer diameter of the first epoxy resin protective sleeve 20 is 2mm larger than the diameter of the maximum circumscribed circle); the inner diameter of the accommodating cavity of the second-stage embedding container is determined according to the oil and gas industry standard, and the specific standard is as follows: the diameter of the conglomerate core is not more than 2cm, and the inner diameter of the accommodating cavity of the second-stage embedding container is determined to be 2.54 cm; the diameter of the conglomerate core is not more than 3.5cm, and the inner diameter of the accommodating cavity of the second-stage embedding container is determined to be 3.8 cm; the diameter of the conglomerate core is not more than 9.5cm, and the inner diameter of the accommodating cavity of the second-stage embedding container is determined to be 10 cm; the diameter of the conglomerate core is 10cm, and the inner diameter of the accommodating cavity of the second-stage embedding container is determined to be 15 cm.
In an alternative embodiment of the invention, the first epoxy boot 20 has an outer diameter greater than 2mm of the diameter of the largest circumscribed circle.
Preferably, the flow deflector 40 is in a shape of a circular disc, and the diameter of the flow deflector is 60% to 80% of the outer diameter of the first epoxy resin protective sheath 20.
In an optional example of the present invention, step 2 specifically includes:
step 21, melting the epoxy resin at 120 ℃, and injecting the epoxy resin into a primary embedding container after the temperature of the epoxy resin is reduced to 20 ℃;
step 22, adding a curing agent into the epoxy resin, and uniformly stirring;
step 23, putting the conglomerate core 10 into a primary embedding container, enabling the end faces (inlet end face and outlet end face) of the conglomerate core to be perpendicular to the axis of the primary embedding container, and ensuring that the conglomerate core 10 is completely immersed by the epoxy resin;
and 24, finishing the epoxy resin curing at normal temperature to form the first epoxy resin protective sleeve 20, wherein the curing time is 48 hours.
In an alternative example of the present invention, in step 3, jet fuel is used as a cooling medium in cutting; after cutting, the aviation kerosene on the cutting surface of the core is wiped clean by using filter paper, then the cut conglomerate core 10 is placed in an oven, the temperature of the oven is set to be 70 ℃, and the heating time of the oven is set to be 15 minutes, so that the core cutting surface of the conglomerate core 10 and aviation kerosene possibly impregnated in the conglomerate core 10 are completely removed. The aviation kerosene is used during cutting, on one hand, the good lubricating property of the aviation kerosene is considered, and on the other hand, the aviation kerosene is mainly used for preventing clay minerals in the conglomerate core 10 from generating water swelling reaction to cause the conglomerate core 10 to be damaged.
In step 3, two end faces of the conglomerate core 10 may be cut flat by using a mechanical cutting machine, two ends of the conglomerate core 10 are required to expose a fresh face of the conglomerate core 10, and the mechanical cutting machine and the cutting method both use the prior art, which is not described herein.
In an optional example of the present invention, the deflector 40 is fixedly connected to the cutting surface of the core by a fixing screw 60, so as to ensure that the deflector 40 is tightly attached to the cutting surface of the core.
Further, in step 4, the outer edge of the flow deflector 40 is also hermetically connected with the cutting surface of the core through sealing glue, so that the blocking of the cutting surface (also the flow deflector) of the core by epoxy resin in the subsequent embedding process is reduced to the maximum extent. The sealing glue can be prepared by the prior art, and is not described herein in detail.
Preferably, the highest tolerance temperature of the sealing glue is not lower than 120 ℃, and the highest tolerance pressure of the sealing glue is not lower than 50 MPa.
In an alternative example of the present invention, the diversion connector 50 and the diversion sheet 40 may be formed by an integrated forming technique, the diversion connector 50 is disposed at the center (circle center) of the diversion sheet 40, and the diversion sheet 40 is disposed coaxially with the conglomerate core 10 to avoid a seepage path deviation error caused by a deviation of a fluid from one side when the fluid enters a core cutting surface.
In an alternative example of the present invention, in step 5, the epoxy resin is cured to form the second epoxy resin protective sleeve in substantially the same manner as in step 2, and in the epoxy resin curing process, the fixing screw 60, the deflector 40 and the first epoxy resin protective sleeve 20 are all immersed in the epoxy resin, and the fluid connectors 50 at both ends are exposed out of the epoxy resin and are not embedded.
The invention also provides a conglomerate sample 100 for core analysis, which is prepared by the conglomerate sample preparation method for core analysis as described above, as shown in fig. 2 to 4, the conglomerate sample 100 for core analysis comprises a conglomerate core 10, a first epoxy resin protective sleeve 20 and a second epoxy resin protective sleeve 30 which are sequentially sleeved from inside to outside, specifically, the conglomerate core 10 is columnar, two ends of the conglomerate core 10 are respectively provided with a flow guide device, the flow guide device comprises a flow guide sheet 40 and a flow guide joint 50, the flow guide sheet 40 is arranged along an axis perpendicular to the conglomerate core 10, the flow guide sheet 40 has a first surface facing the conglomerate core 10 and a second surface facing away from the conglomerate core, the first surface is tightly attached to an end face of the conglomerate core 10 and is fixedly connected with the conglomerate core 10, the second surface is fixedly provided with the flow guide joint 50, the flow guide joint 50 is tubular and has a flow guide cavity penetrating along the axis of the flow guide joint 50, the guide vane 40 is provided with a through hole correspondingly matched with the guide joint, and the through hole is communicated with the gravel sample and the guide cavity; the first epoxy resin protective sleeve 20 is sleeved outside the conglomerate core 10, and the inner wall of the first epoxy resin protective sleeve 20 is hermetically connected with the outer wall of the conglomerate core 10; the second epoxy resin protective sleeve 30 is sleeved outside the first epoxy resin protective sleeve 20, the inner wall of the second epoxy resin protective sleeve 30 is hermetically connected with the outer wall of the first epoxy resin protective sleeve 20, two ends of the second epoxy resin protective sleeve 30 are closed to form a plugging portion, the plugging portion is hermetically connected with the flow deflector 40, and the flow guide connector 50 penetrates through the plugging portion.
In an alternative example, the detailed procedure for the conglomerate sample preparation method for core analysis is as follows:
firstly, taking out and observing a conglomerate core 10 (core sample) to be measured, and determining two end faces (an inlet end face and an outlet end face) of the conglomerate core 10 according to the requirements of core analysis projects; then, measuring the core size of the end face of the conglomerate core 10 by using a vernier caliper, and determining the maximum circumscribed circle diameter of the parallel end face;
then, determining the size of cementing of cylindrical embedding containers (a first-stage embedding container and a second-stage embedding container) for embedding epoxy resin according to the maximum circumscribed circle diameter, wherein the diameter of the cylindrical embedding container for embedding epoxy resin is adjustable, the adjusting range is 2 cm-10 cm, the diameter of the first-stage embedding container is 2mm larger than the maximum circumscribed circle diameter of the conglomerate core, and the diameter of the second-stage embedding container is determined according to the petroleum and natural gas industry standard, and the specific standard is as follows: the diameter of the conglomerate core is not more than 2cm, and the diameter of the second-stage embedding container is determined to be 2.54 cm; the diameter of the conglomerate core is not more than 3.5cm, and the diameter of the second-stage embedding container is determined to be 3.8 cm; the diameter of the conglomerate core is not more than 9.5cm, and the diameter of the second-stage embedding container is determined to be 10 cm; the diameter of the conglomerate core is 10cm, and the diameter of the second-stage embedding cylindrical container is determined to be 15 cm;
then, melting the epoxy resin at 120 ℃, cooling to 20 ℃, injecting into a first-stage embedding container, adding a curing agent, uniformly stirring, then putting the conglomerate core into the first-stage embedding container along the direction of the end face perpendicular to the axis of the first-stage embedding container, ensuring that the conglomerate core is completely immersed by the epoxy resin, completing curing at normal temperature, forming a first epoxy resin protective sleeve 20 outside the conglomerate core 10, and generally curing for 48 hours; the normal temperature curing aims at reducing the infiltration effect of the epoxy resin on the conglomerate core to the maximum extent in the embedding process and protecting the fluid in the conglomerate core from being lost; the epoxy resin, the curing agent and the normal-temperature curing method used in the invention are all the prior art, and are not described herein again;
then, after the epoxy resin is completely cured, taking out the conglomerate core 10 embedded by the first epoxy resin protective sleeve 20; utilizing a mechanical cutting machine to cut two end faces of the conglomerate rock core 10 embedded by the first epoxy resin protective sleeve 20 flat, and requiring that the fresh surfaces of the rock core are exposed from the two end faces to form a rock core cutting surface; when cutting, using aviation kerosene as a cooling medium, after cutting flat, wiping the aviation kerosene on the end face of a sample clean by using filter paper, then placing the sample clean in an oven, setting the temperature at 70 ℃, heating for 15 minutes, and completely removing the cutting surface of the core 10 of the conglomerate core and the aviation kerosene possibly impregnated in the core, wherein the aviation kerosene is used for considering good lubricating property on one hand and mainly preventing clay minerals in the conglomerate core 10 from generating water swelling reaction to cause damage to the conglomerate core 10 on the other hand;
then, circular stainless steel flow guiding devices are respectively installed on two core cutting surfaces of the conglomerate core 10, and each flow guiding device comprises a flow guiding sheet 40 and a flow guiding joint 50, so that pipelines can be conveniently connected. The diameter of the flow deflector 40 is determined by the specification of the first epoxy resin protective sleeve 20 of the conglomerate rock core 10, and is required to be 60% -80% of the diameter (outer diameter) of the first epoxy resin protective sleeve 20, and the center of the flow deflector 40 needs to be overlapped with the center of a rock core cutting surface (rock core exposure surface); one surface of the flow deflector 40 and the core cutting surface of the conglomerate core 10 are fixed by a fixing screw 60, so that the flow deflector 40 is tightly attached to the core cutting surface, high-temperature and high-pressure resistant sealing glue is coated on the edge fixed by the fixing screw 60, the outer edge of the flow deflector 40 and the outer edge of the core cutting surface, and the blocking of epoxy resin on the flow deflector surface in the subsequent embedding process is reduced to the maximum extent; the other surface of the guide vane 40 is externally connected with a guide joint 50; the maximum tolerance temperature of the flow deflector, the flow guide joint and the sealing glue is required to be not lower than 120 ℃, and the maximum tolerance pressure is not lower than 50 MPa;
and finally, setting the size of the second-stage embedding container, repeating the first-stage embedding operation, performing second-stage embedding, wherein the fixing screw 60, the flow deflector 40 and the conglomerate core 10 are required to be completely immersed in the epoxy resin, the flow guide joints 50 at two ends are not embedded, the epoxy resin is cured at normal temperature to form a second epoxy resin protective sleeve 30, the curing time is not less than 48 hours, after the epoxy resin is completely cured, the experiment is finished, and the preparation of the conglomerate sample 100 for core analysis is finished. At this time, the bearing surfaces of the conglomerate sample 100 for core analysis are all epoxy resin, so that the mechanical balance of the whole system is ensured, and the conglomerate core is prevented from being broken in the high-pressure test process.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.
Claims (10)
1. A method of preparing a conglomerate sample for core analysis, characterized in that it comprises:
step 1, observing a conglomerate core to be detected, and determining two end surfaces of the conglomerate core, wherein the two end surfaces are arranged in parallel;
step 2, embedding epoxy resin outside the conglomerate core and curing to form a first epoxy resin protective sleeve;
step 3, cutting two ends of the conglomerate rock core along a direction parallel to the end face, and enabling two ends of the conglomerate rock core to expose fresh rock cores respectively to form rock core cutting faces;
step 4, respectively installing a flow guide device on the two rock core cutting surfaces, wherein the flow guide device comprises a flow guide sheet and a flow guide joint, one surface of the flow guide sheet is fixedly connected with the rock core cutting surfaces, the other surface of the flow guide sheet is fixedly provided with the flow guide joint, and the flow guide sheet is provided with a through hole communicated with the flow guide joint;
and 5, embedding epoxy resin outside the first epoxy resin protective sleeve and the two flow deflectors and curing to form a second epoxy resin protective sleeve, wherein the flow guide joint penetrates through the second epoxy resin protective sleeve.
2. The method for preparing a conglomerate sample for core analysis as recited in claim 1, wherein the step 1 further comprises measuring the end face to obtain a diameter of a largest circumscribed circle of the end face.
3. The method for preparing a conglomerate sample for core analysis as recited in claim 2, wherein an outer diameter of the first epoxy protective casing is 2mm greater than a diameter of the largest circumscribed circle.
4. The method for preparing a conglomerate sample for core analysis as claimed in claim 3, wherein the flow deflector is disc-shaped and has a diameter of 60-80% of the outer diameter of the first epoxy protective casing.
5. The method for preparing a conglomerate sample for core analysis as recited in claim 1, wherein said step 2 comprises:
step 21, melting the epoxy resin at 120 ℃, cooling to 20 ℃, and injecting into a primary embedding container;
step 22, adding a curing agent into the epoxy resin, and uniformly stirring;
step 23, putting the conglomerate core into the primary embedding container, enabling the end face of the conglomerate core to be perpendicular to the axis of the primary embedding container, and ensuring that the conglomerate core is completely immersed by epoxy resin;
and 24, curing the epoxy resin at normal temperature to form the first epoxy resin protective sleeve, wherein the curing time is 48 hours.
6. The method for preparing a conglomerate sample for core analysis as claimed in claim 1, wherein in step 3, jet fuel is used as a cooling medium when cutting; and after cutting, wiping off the aviation kerosene on the cutting surface of the rock core by using filter paper, and then placing the cut conglomerate rock core in an oven, wherein the temperature of the oven is set to be 70 ℃, and the heating time of the oven is 15 minutes.
7. The method for preparing a conglomerate sample for core analysis as claimed in claim 1, wherein in step 4, the outer edge of the flow deflector is sealingly connected with the core cutting surface or the first epoxy protective sheath by means of a sealing glue.
8. The method for preparing a conglomerate sample for core analysis according to claim 7, wherein the sealing glue has a maximum withstand temperature not lower than 120 ℃ and a maximum withstand pressure not lower than 50 MPa.
9. The method for preparing a conglomerate sample for core analysis as claimed in claim 1, wherein the flow deflector is fixedly connected with the cutting surface of the core by a fixing screw.
10. A conglomerate sample for core analysis, prepared by the conglomerate sample preparation method for core analysis according to any one of claims 1 to 9, wherein the conglomerate sample for core analysis comprises, successively nested from inside to outside:
the conglomerate core is columnar, two ends of the conglomerate core are respectively provided with a flow deflector, the flow deflectors are arranged along an axis perpendicular to the conglomerate core, the flow deflectors are provided with a first surface facing the conglomerate core and a second surface facing away from the conglomerate core, the first surface is fixedly connected with the end face of the conglomerate core, a flow guide joint is fixedly arranged on the second surface, the flow guide joint is tubular and provided with a flow guide cavity communicated along the axis of the flow guide joint, and the flow deflector is provided with a through hole correspondingly matched with the flow guide joint;
the first epoxy resin protective sleeve is sleeved outside the conglomerate core, and the inner wall of the first epoxy resin protective sleeve is hermetically connected with the outer wall of the conglomerate core;
the second epoxy resin protective sleeve is sleeved outside the first epoxy resin protective sleeve, the inner wall of the second epoxy resin protective sleeve is hermetically connected with the outer wall of the first epoxy resin protective sleeve, two ends of the second epoxy resin protective sleeve are sealed to form a plugging portion, the plugging portion is hermetically connected with the flow deflector, and the flow guide connector penetrates through the plugging portion.
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| CN111456715A (en) * | 2020-05-04 | 2020-07-28 | 西南石油大学 | Oil-gas well cement sheath-brittle stratum interface shear bonding strength testing device and method |
| CN114894693B (en) * | 2022-04-28 | 2023-03-28 | 河南理工大学 | Small-size rock core permeability testing method and device |
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