CN108956351B - Analysis method and device for sand-carrying gas washout rock core - Google Patents
Analysis method and device for sand-carrying gas washout rock core Download PDFInfo
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- CN108956351B CN108956351B CN201710374878.5A CN201710374878A CN108956351B CN 108956351 B CN108956351 B CN 108956351B CN 201710374878 A CN201710374878 A CN 201710374878A CN 108956351 B CN108956351 B CN 108956351B
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- G01N3/56—Investigating resistance to wear or abrasion
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an analysis method and a device for sand-carrying gas washout of a rock core, wherein the analysis method comprises the following steps: preparing a first sample and a second sample with the same shape and size; applying preset pressure to all the core samples to enable the core samples to generate cracks; weighing a core sample to obtain a first weight; pressurizing the first sample until the first sample is damaged to obtain a first sample critical pressure value; adopting sand-carrying gas to impact the second sample until the preset time is up; weighing the second sample to obtain a second weight; pressurizing the second sample until the second sample is damaged to obtain a critical pressure value of the second sample; and comparing the first weight with the second weight with the first sample critical pressure value and the second sample critical pressure value respectively to obtain the analysis result of the sand production influence and the damage influence of the quantitative sand-carrying gas on the rock core sample.
Description
Technical Field
The invention relates to the technical field of gas well development, in particular to an analysis method and device for a sand-carrying gas washout rock core.
Background
Sand production is one of the most important problems in the development and exploitation process of oil and gas fields, and a large amount of manpower and material resources are required to be invested every year for research and control. The harm is mainly shown in that: sand buries the producing zone or shaft, resulting in production loss or production stoppage; severe abrasion, sand sticking to surface and downhole equipment; maintenance workload such as sand washing pump inspection, ground tank cleaning and the like is increased sharply; damage to casing and abandonment of oil and gas wells. If the effective prevention and control are not achieved, the sand production situation is more and more serious, and the sand production oil-gas well cannot be normally and effectively developed.
The specific process of sand production is as follows: in the oil and gas production process, when the reservoir production differential pressure exceeds the critical production differential pressure, the formation produces sand, and aiming at the condition of a gas well, gas at the far end of the reservoir carries sand grains to flow to a shaft at a high speed, so that impact and suction damage can be generated on rocks in a reservoir gas flow passage, and the reservoir sand production is also aggravated; after the sand-carrying gas enters the shaft, oil and the casing pipe are eroded, so that the well cannot normally produce; after the sand-carrying gas enters the ground gathering and transportation system, the sand-carrying gas can be eroded and damaged. Therefore, the research and analysis of the sand-carrying gas have important significance on the erosion of reservoir rock.
Disclosure of Invention
In view of this, the invention provides an analysis method and an analysis device for sand-carrying gas to erode a rock core, so as to realize quantitative analysis of the influence of the sand-carrying gas on sand production and damage of reservoir rock.
The invention provides an analysis method for sand-carrying gas washout of a rock core, which comprises the following steps: preparing a core sample, wherein the core sample comprises a first sample and a second sample which are the same in shape and size; applying a preset pressure to each core sample to crack each core sample; after rock debris of each rock core sample is removed, weighing the weight of each rock core sample to obtain a first weight, wherein the first weight is the average weight of all current rock core samples; increasing pressure at a constant speed on the first sample until the first sample is damaged, and obtaining a critical pressure value of the first sample; impacting the second sample by adopting sand-carrying gas with preset flow until the second sample stops in preset time; after rock debris of the second sample is removed, weighing the second sample to obtain the current second weight of the second sample; increasing the pressure of the second sample at a constant speed until the second sample is damaged, and obtaining a critical pressure value of the second sample; comparing the first weight with the second weight to obtain the sand production influence of the sand-carrying gas on the core sample; and comparing the critical pressure value of the first sample with the critical pressure value of the second sample to obtain the damage influence of the sand-carrying gas on the core sample.
Another aspect of the present invention provides an apparatus for analyzing sand-laden gas washout of a core, comprising: the preparation module is used for preparing a core sample, and the core sample comprises a first sample and a second sample which are the same in shape and size; the pressing module is used for applying preset pressure to each core sample so as to enable each core sample to generate cracks; the pressure applying module is further used for increasing the pressure of the first sample at a constant speed until the first sample is damaged, and obtaining a critical pressure value of the first sample; the pressure applying module is further used for increasing the pressure of the second sample at a constant speed until the second sample is damaged, and obtaining a critical pressure value of the second sample; the weighing module is used for weighing the weight of each core sample after rock debris of each core sample is removed; the weighing module is used for weighing the weight of each core sample after removing rock debris of each core sample to obtain a first weight, and the first weight is the average weight of all the core samples; the weighing module is further used for weighing the second sample after rock debris of the second sample is removed, and obtaining a second weight of the current second sample; the impact module is used for adopting sand-carrying gas with preset flow to impact the second sample until the preset time is up; the processing module is used for comparing the first weight with the second weight to obtain the sand production influence of the sand-carrying gas on the core sample; and the processing module is also used for comparing the first sample critical pressure value with the second sample critical pressure value to obtain the damage influence of the sand-carrying gas on the core sample.
According to the analysis method and device for the sand-carrying gas eroded rock core, the sand output of the rock core sample after being eroded by the sand-carrying gas is obtained by comparing the weight of the same rock core sample before and after the sand-carrying gas is eroded; the damage influence of the rock core sample after the sand-carrying gas is eroded is obtained by comparing the critical pressure values of the same rock core sample crushed before and after the sand-carrying gas is eroded. The core sample is obtained from the reservoir, so that the influence of the sand-carrying gas on sand production and damage of reservoir rock is quantitatively analyzed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of an analysis method for eroding a core by a sand-carrying gas according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for analyzing sand-laden gas washout of a core according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of an analysis apparatus for sand-laden gas washout of a core according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of an analysis method for eroding a core by sand-carrying gas according to an embodiment of the present invention, as shown in fig. 1, the method includes:
101. core samples are prepared, and the core samples comprise a first sample and a second sample which are identical in shape and size.
The method comprises the steps of obtaining a rock core in a high-temperature high-pressure gas well reservoir, drilling the rock core by a diamond machine, and processing the rock core to obtain a required rock core sample, wherein the obtained rock core sample cannot have artificial fractures in the processing and manufacturing process of drilling the rock core and the sample. And the shape and the size of each prepared core sample are the same so as to facilitate the comparative analysis of the obtained data in the subsequent operation.
Optionally, a core sample with a regular shape may be prepared, so that the pressure distribution of the stress surface of the core sample is uniform, thereby improving the accuracy of the analysis result, and correspondingly, 101 may specifically include: obtaining a core through a diamond machine; and sequentially processing the rock core through a stone cutting machine and a stone grinding machine to obtain the cylindrical or square column-shaped rock core sample.
Optionally, the machining precision of the core sample in the shape of a cylinder or a square cylinder needs to meet certain requirements to obtain a more accurate analysis result, and correspondingly, the core is machined sequentially through a stone cutter and a stone grinder to obtain the core sample in the shape of a cylinder or a square cylinder, which specifically includes: the rock core is processed through a stone grinder, so that the flatness tolerance of the two end faces of the rock core sample is 0.05 millimeter (mm), and the maximum deviation of the two end faces of the rock core sample, which is perpendicular to the central axis of the rock core sample, is not more than 0.25 degrees.
As a practical way, the core sample may be a sample in the shape of a cylinder, and accordingly, the cylindricity tolerance of the core sample may be 0.3 mm.
As another practical way, the core sample is a sample in a cylindrical shape, and the diameter of the core sample is 100mm, and the height of the core sample is 60 mm.
The pressure may be preset according to the initialization condition, for example, assuming that the core sample is a cylindrical sample, the diameter of the core sample is 100mm, the height of the core sample is 60mm, and the preset pressure may be 1000 newtons (N). The core samples under such conditions will exhibit substantially the same crack defects, resulting in a fractured sample.
Optionally, a series of processing operations may be performed on the core sample, so as to improve the quality of the core sample, thereby improving the accuracy of the analysis result, and correspondingly, 101 may specifically include: cleaning the surface of the core sample; vacuumizing the core sample; drying the rock core sample; the core sample was cooled in a desiccator to room temperature.
Specifically, firstly, a brush tool is used for removing dust, loose particles and the like on the surface of a core sample; in order to avoid pressure difference between the inside and the outside of the core sample and ensure that the subsequently obtained experimental data are more reliable, a vacuumizing device is used for vacuumizing the core sample; then, putting the core sample in an oven for drying for 24 hours to avoid liquid residue in the core sample; finally, the core sample is placed in a desiccator to prevent moisture uptake during cooling of the core sample to room temperature.
102. A predetermined pressure is applied to each core sample to crack each core sample.
The shape and the size of each core sample are the same, so that each core sample can have basically the same crack defect after the preset pressure is applied.
Optionally, before 102, the method further includes: and oil layers are coated on two end faces of each core sample. Specifically, a thinner oil layer can be coated, so that when the pressure testing machine pressurizes the end face of the core sample, the friction between the pressure testing machine and the end face of the core sample is reduced, and the accuracy and the reliability of an analysis result are improved.
Optionally, the applying a preset pressure to each core sample includes: and vertically applying preset pressure to the end face of each core sample. Specifically, a preset pressure is vertically applied to the same end face of each core sample, and the same cracks are more easily generated on each core sample under the pressure condition.
103. And after removing rock debris of each rock core sample, weighing the weight of each rock core sample to obtain a first weight, wherein the first weight is the average weight of all the rock core samples at present.
The rock debris generated by each core sample can be blown out by strong wind generated by a fan device and the like, then the rock debris is weighed respectively to obtain the current weight of each core sample, and the first weight is obtained by dividing the sum of the current weights of all the core samples by the number of all the core samples.
104. And increasing the pressure of the first sample at a constant speed until the first sample is damaged, and obtaining the critical pressure value of the first sample.
The pressure can be slowly and uniformly increased by a pressure tester, and when the first sample is damaged, the pressure value at the moment, namely the critical pressure value of the first sample, is recorded. Wherein 104 may be performed before, simultaneously with, or after 107, which is not limited herein.
Optionally, in the process of increasing the pressure of the first sample at a constant speed until the first sample is damaged, the pressure value borne by the first sample may be recorded at regular time. The pressure variation law of the first sample can be obtained by recording the pressure value of the first sample every 20 seconds, for example.
105. And impacting the second sample by adopting sand-carrying gas with preset flow until the preset time is up.
The second sample can be placed in a pipeline, high-speed gas with fine sand is filled into the pipeline, the sand-carrying gas impacts the second sample until the impact preset time is stopped, wherein the preset time can be set according to the actual production time.
106. And weighing the second sample after removing the rock debris of the second sample, wherein the weighed weight of the second sample is the second weight.
The second sample can be weighed to obtain a second weight, wherein the second weight is the weight of the second sample after the sand-carrying gas is eroded.
Optionally, in order to improve the accuracy of the analysis result, the number of the second samples may be multiple, and specifically, the sand-carrying gas with the same flow rate is used for impacting all the second samples until the second samples stop at the same time. Accordingly, 106 may obtain the second weight by averaging the weights of all the second samples present.
107. And increasing the pressure of the second sample at a constant speed until the second sample is damaged, and obtaining the critical pressure value of the second sample.
The pressure can be slowly and uniformly increased on the second sample through the pressure tester, so that the pressurizing time and the pressure value can be conveniently obtained from the pressure tester, and when the second sample is damaged, the pressure value at the moment, namely the critical pressure value of the second sample, is recorded.
Optionally, in the process of increasing the pressure of the second sample at a constant speed until the second sample is damaged, the pressure value borne by the second sample is recorded at regular time. For example, the pressure value born by the second sample is recorded every 20 seconds, and the pressure change rule of the second sample can be obtained.
108. Comparing the first weight with the second weight to obtain the sand production influence of the sand-carrying gas on the core sample; and comparing the critical pressure value of the first sample with the critical pressure value of the second sample to obtain the damage influence of the sand-carrying gas on the core sample.
According to the obtained comparison of the first weight and the second weight, the sand production influence of the sand-carrying gas on the core sample can be obtained, and the difference value between the first weight and the second weight is the sand production amount of the core sample after the core sample is eroded by the sand-carrying gas; wherein the core sample is obtained from the reservoir, namely the sand production influence of the sand-carrying gas on the reservoir rock is obtained.
The first sample critical pressure value is the pressure value at the moment when the core sample is damaged before erosion, the second sample critical pressure value is the pressure value at the moment when the same core sample is damaged after erosion, the change of the compressive strength of the core sample before and after erosion can be known by comparing the two values, wherein the core sample is obtained from the reservoir, and the damage influence of the sand-carrying gas on the reservoir rock is obtained.
According to the analysis method for the sand-carrying gas to erode the rock core, the sand output and the crushed critical pressure values of the rock core sample before and after the sand-carrying gas is eroded are obtained respectively, the obtained data are compared and analyzed, so that the sand output and damage influence of the sand-carrying gas on the rock core sample are obtained, wherein the rock core sample is obtained from the reservoir, and therefore the influence of the sand-carrying gas on the sand output and damage of the reservoir rock is quantitatively analyzed.
Fig. 2 is a schematic flow chart of an analysis method for eroding a core by sand-laden gas according to another embodiment of the present invention, as shown in fig. 2, based on the embodiment shown in fig. 1, the number of the second samples is multiple, and accordingly, 105 specifically may include:
205. and for each second sample, adopting the sand-carrying gas with the flow rate corresponding to the second sample to impact the second sample until the time corresponding to the second sample is stopped, wherein the flow rate of the sand-carrying gas corresponding to each second sample is different, and the time corresponding to each second sample is different.
Taking the actual scene as an example: first, core samples with the same shape and size are prepared, wherein the core samples comprise a first sample and a plurality of second samples.
For each second sample, firstly putting the second sample into a pipeline, then filling high-speed gas with fine sand into the pipeline, and enabling the sand-carrying gas to impact the second sample until the impact preset time is stopped, wherein the preset time can be set according to the actual production time. A plurality of different preset times can be set for a plurality of second samples, and sand-carrying gas with different flow rates can be filled into the pipeline so as to carry out comparison under different conditions.
Accordingly, 108 may specifically include:
208. according to the comparison between the first weight and the second weight of the plurality of second samples, obtaining the sand production influence of the sand-carrying gas with different flow rates and erosion time on the core sample; and obtaining the damage influence of the sand-carrying gas with different flow rates and erosion time on the core sample according to the comparison between the critical pressure value of the first sample and the critical pressure values of the second samples of the plurality of second samples.
Specifically, in this embodiment, the second weights of the plurality of second samples under different erosion of the sand-carrying gas are obtained, and according to the comparison between the first weight and the plurality of second weights, the sand-producing effect of the sand-carrying gas with different flow rates and erosion times on the core sample can be obtained; and obtaining second sample critical pressure values of the plurality of second samples after the erosion of the different sand-carrying gases in the embodiment, and obtaining the damage influence of the sand-carrying gases with different flow rates and erosion time on the rock core sample according to the comparison between the first sample critical pressure values and the plurality of second sample critical pressure values.
According to the analysis method for the sand-carrying gas to erode the rock core, the sand output, the crushed critical pressure value and the pressure change rule of the rock core sample before and after the sand-carrying gas is eroded are obtained respectively, and more comparison data can be obtained due to the fact that the number of the second samples is multiple, the analysis results of sand output and damage influences of the sand-carrying gas on the rock core sample under different conditions can be obtained more accurately, wherein the rock core sample is obtained from the reservoir, and therefore the influences of the sand-carrying gas on the sand output and damage of the reservoir rock are analyzed quantitatively.
Fig. 3 is a schematic structural diagram of an analysis apparatus for eroding a core by sand-laden gas according to another embodiment of the present invention, as shown in fig. 3, the apparatus includes:
the preparation module 31 is used for preparing a core sample, and the core sample comprises a first sample and a second sample which are the same in shape and size;
the pressing module 32 is used for applying preset pressure to each core sample so as to crack each core sample;
the pressure applying module 32 is further configured to apply pressure to the first sample at a constant speed until the first sample is destroyed, so as to obtain a critical pressure value of the first sample;
the pressure applying module 32 is further configured to apply pressure to the second sample at a constant speed until the second sample is destroyed, so as to obtain a critical pressure value of the second sample;
the weighing module 33 is used for weighing the weight of each core sample after removing rock debris of each core sample;
the weighing module 33 is configured to weigh the weight of each core sample after removing rock debris of each core sample to obtain a first weight, where the first weight is an average weight of all core samples;
the weighing module 33 is further configured to weigh the second sample after rock debris of the second sample is removed, so as to obtain a second weight of the current second sample;
the impact module 34 is configured to impact the second sample with a sand-carrying gas at a preset flow rate until a preset time is up;
a processing module 35, configured to compare the first weight and the second weight to obtain a sand production influence of the sand-carrying gas on the core sample;
and the processing module 35 is further configured to compare the first sample critical pressure value with the second sample critical pressure value to obtain a damage influence of the sand-carrying gas on the core sample.
Optionally, a core sample with a regular shape may be prepared, so that the pressure distribution of the stress surface of the core sample is uniform, thereby improving the accuracy of the analysis result, and correspondingly, the preparation module 31 is specifically configured to obtain the core by a diamond machine; and sequentially processing the rock core through a stone cutting machine and a stone grinding machine to obtain the cylindrical or square column-shaped rock core sample.
Optionally, the machining precision of the core sample in the shape of a cylinder or a square cylinder needs to meet certain requirements to obtain a more accurate analysis result, and correspondingly, the preparation module 31 is specifically used for machining the core through a stone grinder, so that the flatness tolerance of two end faces of the core sample is 0.05mm, and the maximum deviation of the two end faces of the core sample perpendicular to the central axis of the core sample is not more than 0.25 °.
As a practical way, the core sample may be a sample in the shape of a cylinder, and accordingly, the cylindricity tolerance of the core sample may be 0.3 mm.
As another practical way, the core sample is a sample in a cylindrical shape, and the diameter of the core sample is 100mm, and the height of the core sample is 60 mm.
Optionally, a series of processing operations may be performed on the core sample to improve the quality of the core sample, so as to improve the accuracy of the analysis result, and accordingly, the preparation module 31 is specifically further configured to clean the surface of the core sample; vacuumizing the core sample; drying the rock core sample; the core sample was cooled in a desiccator to room temperature.
Optionally, in the process of increasing the pressure of the first sample at a constant speed until the first sample is damaged, the pressure applying module 32 may record the pressure value borne by the first sample at regular time.
Optionally, in order to improve the accuracy of the analysis result, the number of the second samples may be multiple, and specifically, the impact module 34 performs impact on all the second samples with the same flow rate of the sand-carrying gas until the second samples stop at the same time. Accordingly, the weighing module 33 may obtain the second weight by averaging the weights of all the second samples at present. Optionally, in the process of increasing the pressure of the second sample at a constant speed until the second sample is damaged, the pressure applying module 32 records the pressure value borne by the second sample at regular time.
Specifically, the processing module 35 may obtain the sand production influence of the sand-carrying gas on the core sample according to the obtained comparison between the first weight and the second weight, where a difference between the first weight and the second weight is a sand production amount of the core sample after the core sample is eroded by the sand-carrying gas; wherein the core sample is obtained from the reservoir, namely the sand production influence of the sand-carrying gas on the reservoir rock is obtained. Specifically, the critical pressure value of the first sample is the pressure value at the moment when the core sample is damaged before erosion, the critical pressure value of the second sample is the pressure value at the moment when the same core sample is damaged after erosion, the change of the compressive strength of the core sample before and after erosion can be known by comparing the two values, wherein the core sample is obtained from the reservoir, and the damage influence of the sand-carrying gas on the reservoir rock is obtained.
The analysis device for the sand-carrying gas to erode the rock core provided by the embodiment obtains the sand production amount and the crushed critical pressure value of the rock core sample before and after the sand-carrying gas is eroded respectively, and compares and analyzes the obtained data to obtain the sand production and damage influence of the sand-carrying gas on the rock core sample, wherein the rock core sample is obtained from the reservoir, namely the influence of the sand-carrying gas on the sand production and damage of the reservoir rock is quantitatively analyzed.
In an analysis apparatus for eroding a core by using a sand-carrying gas according to another embodiment of the present invention, based on the embodiment shown in fig. 3, the number of the second samples is multiple, and correspondingly, the impact module 34 is specifically configured to, for each second sample, impact the second sample by using the sand-carrying gas at a flow rate corresponding to the second sample until the time corresponding to the second sample is stopped, where the flow rate of the sand-carrying gas corresponding to each second sample is different, and the time corresponding to each second sample is different.
Taking the actual scene as an example: first, core samples with the same shape and size are prepared, wherein the core samples comprise a first sample and a plurality of second samples. For each second sample, firstly putting the second sample into a pipeline, then filling high-speed gas with fine sand into the pipeline, and enabling the sand-carrying gas to impact the second sample until the impact preset time is stopped, wherein the preset time can be set according to the actual production time. A plurality of different preset times can be set for a plurality of second samples, and sand-carrying gas with different flow rates can be filled into the pipeline so as to carry out comparison under different conditions.
Correspondingly, the processing module 35 may be specifically configured to obtain the sand-producing effect of the sand-carrying gas with different flow rates and erosion times on the core sample according to the comparison between the first weight and the second weight of the plurality of second samples; and obtaining the damage influence of the sand-carrying gas with different flow rates and erosion time on the rock core sample according to the comparison between the critical pressure value of the first sample and the critical pressure values of the second samples of the plurality of second samples.
Specifically, in this embodiment, the second weights of the plurality of second samples under different erosion of the sand-carrying gas are obtained, and according to the comparison between the first weight and the plurality of second weights, the sand-producing effect of the sand-carrying gas with different flow rates and erosion times on the core sample can be obtained; and obtaining second sample critical pressure values of the plurality of second samples after the erosion of the different sand-carrying gases in the embodiment, and obtaining the damage influence of the sand-carrying gases with different flow rates and erosion time on the rock core sample according to the comparison between the first sample critical pressure values and the plurality of second sample critical pressure values.
The analysis device of sand-carrying gas washout rock core that this embodiment provided, through obtaining the sand production volume of rock core sample before and after sand-carrying gas washout, by the critical pressure value of crushing and the pressurized law of change respectively, and because the quantity of second sample is a plurality of, can obtain more contrast data, can be more accurate obtain the analysis result of sand-carrying gas under the different situation to the sand production of rock core sample and destruction influence, wherein the rock core sample obtains from the reservoir, realized promptly that quantitative analysis sand-carrying gas is to the sand production of reservoir rock and the influence of destruction.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An analysis method for sand-carrying gas washout of a core, comprising:
preparing a core sample, wherein the core sample comprises a first sample and a second sample which are the same in shape and size;
applying a preset pressure to each core sample to crack each core sample;
after rock debris of each rock core sample is removed, weighing each rock core sample to obtain a first weight, wherein the first weight is the average weight of all current rock core samples;
increasing pressure at a constant speed on the first sample until the first sample is damaged, and obtaining a critical pressure value of the first sample;
impacting the second sample by adopting sand-carrying gas with preset flow until the second sample stops in preset time; after rock debris of the second sample is removed, weighing the second sample to obtain the current second weight of the second sample;
increasing the pressure of the second sample at a constant speed until the second sample is damaged, and obtaining a critical pressure value of the second sample;
comparing the first weight with the second weight to obtain the sand production influence of the sand-carrying gas on the core sample;
and comparing the critical pressure value of the first sample with the critical pressure value of the second sample to obtain the damage influence of the sand-carrying gas on the core sample.
2. The method of claim 1, further comprising:
in the process of increasing pressure at a constant speed until the first sample is damaged, regularly recording the pressure value born by the first sample;
and in the process of increasing the pressure of the second sample at a constant speed until the second sample is damaged, regularly recording the pressure value born by the second sample.
3. The method of claim 1, wherein the number of the second samples is plural;
adopting the sand-carrying gas of predetermineeing the flow to strike the second sample, stop until predetermined time, include:
and for each second sample, adopting sand-carrying gas with the flow rate corresponding to the second sample to impact the second sample until the time corresponding to the second sample is stopped, wherein the flow rate of the sand-carrying gas corresponding to each second sample is different, and the time corresponding to each second sample is different.
4. The method of any one of claims 1-3, wherein the preparing a core sample comprises:
obtaining a core through a diamond machine;
and sequentially processing the rock core through a stone cutting machine and a stone grinding machine to obtain the cylindrical or square column-shaped rock core sample.
5. The method of any one of claims 1-3, wherein the preparing a core sample further comprises:
cleaning the surface of the core sample;
vacuumizing the core sample;
drying the rock core sample;
the core sample was cooled in a desiccator to room temperature.
6. The method of claim 4, wherein the machining of the core sequentially through a stone cutter and a stone grinder to obtain the core sample in a cylindrical or square cylinder shape comprises:
the rock core is processed through a stone grinder, so that the flatness tolerance of the two end faces of the rock core sample is 0.05mm, and the maximum deviation of the two end faces of the rock core sample, which is perpendicular to the central axis of the rock core sample, is not more than 0.25 degrees.
7. The method of claim 4, wherein the core sample is a cylindrically shaped sample having a cylindricity tolerance of 0.3 mm.
8. The method of claim 4, wherein prior to applying the predetermined pressure to each of the core samples, further comprising: and oil layers are coated on two end faces of each core sample.
9. The method of claim 4, wherein said applying a predetermined pressure to each of said core samples comprises:
and vertically applying preset pressure to the end face of each core sample.
10. An analysis device for sand-laden gas washout of a core, comprising:
the preparation module is used for preparing a core sample, and the core sample comprises a first sample and a second sample which are the same in shape and size;
the pressing module is used for applying preset pressure to each core sample so as to enable each core sample to generate cracks;
the pressure applying module is further used for increasing the pressure of the first sample at a constant speed until the first sample is damaged, and obtaining a critical pressure value of the first sample;
the pressure applying module is further used for increasing the pressure of the second sample at a constant speed until the second sample is damaged, and obtaining a critical pressure value of the second sample;
the weighing module is used for weighing each core sample after rock debris of each core sample is removed to obtain a first weight, and the first weight is the average weight of all the core samples;
the weighing module is further used for weighing the second sample after rock debris of the second sample is removed, and obtaining a second weight of the current second sample;
the impact module is used for adopting sand-carrying gas with preset flow to impact the second sample until the preset time is up;
the processing module is used for comparing the first weight with the second weight to obtain the sand production influence of the sand-carrying gas on the core sample;
and the processing module is also used for comparing the first sample critical pressure value with the second sample critical pressure value to obtain the damage influence of the sand-carrying gas on the core sample.
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| US7647821B2 (en) * | 2005-09-22 | 2010-01-19 | Bloomquist David G | Apparatus for estimating the rate of erosion and methods using the same |
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| US7647821B2 (en) * | 2005-09-22 | 2010-01-19 | Bloomquist David G | Apparatus for estimating the rate of erosion and methods using the same |
| CN101915854A (en) * | 2010-08-06 | 2010-12-15 | 中国石油大学(北京) | Device and method for detecting sanding critical flow velocity of gas well |
| CN103323357A (en) * | 2013-06-14 | 2013-09-25 | 三峡大学 | Rock scouring stimulating device |
| CN104897510A (en) * | 2015-04-08 | 2015-09-09 | 中国石油大学(北京) | Method for evaluating erosion rate of sand control pipe and its special-purpose apparatus |
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