CN112392447B - Sieve tube - Google Patents
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- CN112392447B CN112392447B CN202011398772.7A CN202011398772A CN112392447B CN 112392447 B CN112392447 B CN 112392447B CN 202011398772 A CN202011398772 A CN 202011398772A CN 112392447 B CN112392447 B CN 112392447B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
The invention discloses a sieve tube, which relates to the technical field of sand control of oil and gas wells, and comprises: the base pipe is provided with a first opening on the side wall; the protective shell is sleeved outside the base pipe, a second opening is formed in the side wall of the protective shell, and an annular accommodating cavity is formed between the base pipe and the protective shell; and the pre-filled particle units are filled in the accommodating cavities and comprise ceramsite and soluble particles which can be dissolved by contacting oil, water, acid liquor, alkali liquor, salt liquor or natural gas. This application can reach from the function of deblocking to the high steady production period of extension sand production oil well.
Description
Technical Field
The invention relates to the technical field of sand prevention of oil and gas wells, in particular to a sieve tube.
Background
For loose sandstone reservoirs, sand prevention is an indispensable link in the exploitation process of the oil and gas reservoirs, and plays an important role in the stable exploitation of crude oil. Since the 90 s of the 20 th century, on the basis of the continuous improvement of the old sand prevention process, technicians in the field actively research and develop new sand prevention processes and new methods, and particularly, the rapid development is achieved in the aspect of mechanical sand prevention. At present, mechanical sand control technology exists as a main sand control mode.
However, from the point of view of field use, the mechanical screen sand control process still has two problems: 1. on one hand, the sand control exploitation of the unconsolidated sandstone reservoir causes the screen pipe blockage, the productivity is greatly reduced, the blockage mechanism of various screen pipes is not clear, and a reasonable solution for slowing down the screen pipe blockage is not found; 2. on the other hand, the partial blockage of the screen pipe can cause the reduction of the flow area of the screen pipe, and the pressure difference and the partial flow velocity are increased, so that the erosion damage to the screen pipe is generated, and the sand control failure of the screen pipe is caused, which is frequently seen in the current production process of offshore oil fields.
Therefore, there is a need to develop a mechanical sand control screen capable of achieving self-plugging removal function, thereby prolonging the service life of the mechanical sand control screen
High stable production period of the sand producing oil well.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problem to be solved by the embodiment of the invention is to provide the screen pipe which can achieve the function of self-plugging removal, so that the high stable production period of a sand production well is prolonged.
The specific technical scheme of the embodiment of the invention is as follows:
a screen, the screen comprising:
the base pipe is provided with a first opening on the side wall;
the protective shell is sleeved outside the base pipe, a second opening is formed in the side wall of the protective shell, and an annular accommodating cavity is formed between the base pipe and the protective shell;
and the pre-filled particle units are filled in the accommodating cavities and comprise ceramsite and soluble particles which can be dissolved by contacting oil, water, acid liquor, alkali liquor, salt liquor or natural gas.
Preferably, the volume ratio of the ceramsite to the soluble particles is greater than or equal to 4: 1.
Preferably, when the formation fluid flows across the surface of the soluble particles, and under the formation temperature environment, the soluble particles can be dissolved at a preset speed, so that the gaps among the ceramic particles are gradually increased, and the self-plugging removal is realized.
Preferably, the underground stratum where the sieve tube is located is measured by adopting an acoustic time difference method, when the acoustic time difference is less than or equal to 312 μ s/m, the underground stratum where the sieve tube is located is stable sandstone, and the preset dissolving speed of the soluble particles is that the dissolved mass per day accounts for 0-3.6% of the original total soluble particle mass.
Preferably, the stratum under the screen pipe is measured, when the acoustic wave time difference is greater than or equal to 345 μ s/m, the stratum under the screen pipe is extremely unstable sandstone, and the preset dissolving speed of the soluble particles is 5-10% of the dissolved mass of the soluble particles per day.
Preferably, the soluble particles start to dissolve when the ambient temperature of the soluble particles reaches 50 degrees or more.
Preferably, when the environment temperature of the soluble particles reaches 60 degrees or more, the soluble particles start to dissolve, and the soluble particles adopt stearic acid or ice flower wax.
Preferably, the soluble particles are made using paraffin.
Preferably, the preset speed is that the mass dissolved in each day is less than or equal to 10% of the mass of the original total soluble particles.
Preferably, when the median diameter of the ceramsite/the median diameter of the formation sand is less than or equal to 6, the ratio of the volume of the soluble particles to the volume of the particles in the pre-packed particle units is between 8% and 10%;
when the median diameter of the ceramsite/the median diameter of the formation sand grains is between 6 and 8, the volume of the soluble particles is between 5% and 8% of the volume of the particles in the pre-packed particle units;
when the median diameter of the ceramsite/the median diameter of the formation sand is between 8 and 10, the volume of the soluble particles is between 3% and 5% greater than the volume of the particles in the pre-packed particle units.
The technical scheme of the invention has the following remarkable beneficial effects:
the screen pipe in this application realizes playing the effect of stopping to the big sand grain of particle size through the hole between the granule in the prefilled granule unit, and the fluid that mingles with the sand grain passes through the second trompil of protective housing after the filtration of prefilled granule unit, during the first trompil inflow screen pipe of base pipe again, less sand grain or argillaceous class can be smooth through the smooth haydite through the screen pipe along with the fluid. When the pores among the particles are slowly blocked, the soluble particles in the pre-filled particle units can be slowly dissolved in the stratum where the sieve tube is positioned, the volume of the soluble particles is gradually reduced along with the continuous dissolution, the pores among the particles of the pre-filled particle units in the sieve tube can be slowly increased along with the reduction of the volume, the bridge plug can be gradually damaged, the sieve tube is effectively prevented from being blocked at the initial production stage, the sieve tube has a self-plugging-releasing function at the initial strong sand production stage, the overflowing capacity of the sieve tube is maintained, and the productivity of an oil well is ensured.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
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 schematic view of a screen according to an embodiment of the present invention, partially broken away;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of a screen partially broken away in another embodiment of the present invention.
Reference numerals of the above figures:
1. a base pipe; 11. a first opening; 2. a protective shell; 21. a second opening; 3. an accommodating chamber; 4. pre-packed particle units; 5. an elastic mechanism.
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. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to achieve the function of self-plugging removal and thus prolong the high steady production period of a sand production well, the present application proposes a screen, fig. 1 is a schematic structural diagram of the screen in an embodiment of the present invention, partially cut away, and fig. 2 is a cross-sectional view taken along line a-a in fig. 1, and as shown in fig. 1 and 2, the screen may include: the base tube comprises a base tube 1, wherein a first opening 11 is formed in the side wall of the base tube 1; the protective shell 2 is sleeved outside the base tube 1, a second opening 21 is formed in the side wall of the protective shell 2, and an annular accommodating cavity 3 is formed between the base tube 1 and the protective shell 2; and a pre-packed particle unit 4 filled in the accommodation chamber 3, the pre-packed particle unit 4 including a ceramsite and soluble particles capable of being dissolved by contacting oil or water.
The sieve tube in this application realizes playing the effect of stopping to the big sand grain of particle size through the hole between the granule in the prefilled granule unit 4, and the fluid that mingles with the sand grain passes through the second trompil 21 of protective housing 2 through the filtration back of prefilled granule unit 4, during the first trompil 11 inflow sieve tube of base pipe 1 again, less sand grain or argillaceous class can be smooth through the smooth haydite along with the fluid through the sieve tube. When the pores among the particles are gradually blocked, the soluble particles in the pre-filled particle units 4 can be slowly dissolved in the stratum where the sieve tube is positioned, the volume of the soluble particles is gradually reduced along with the continuous dissolution, and the pores among the particles of the pre-filled particle units 4 in the sieve tube can be slowly increased along with the reduction of the volume, so that the bridge plug can be gradually damaged, the sieve tube is effectively prevented from being blocked in the initial production stage, the sieve tube has a self-blocking-releasing function in the early production stage, the overflowing capacity of the sieve tube is maintained, and the productivity of an oil well is ensured.
To provide a better understanding of the screen of the present application, it will be further explained and illustrated below. As shown in fig. 1, the screen includes: the base tube 1, the protective housing 2 and the pre-filled particle unit 4 of cover-mounting outside the base tube 1. The base pipe 1 extends in the vertical direction, and the cross section of the base pipe can be a pipe body in various shapes. The base pipe 1 has a plurality of first openings 11 on a sidewall thereof, and the first openings 11 are circumferentially distributed and vertically distributed. The first openings 11 allow fluid to flow from the outside of the base pipe 1 into the interior of the base pipe 1 and also have the effect of partly blocking large particles of impurities in the fluid, such as sand, etc.
As shown in fig. 1, the protective casing 2 is sleeved outside the base pipe 1, and the protective casing 2 extends substantially in a vertical direction. The side wall of the protective casing 2 is provided with a plurality of second openings 21, and the second openings 21 are distributed along the circumferential direction and are distributed along the vertical direction. The second openings 21 allow fluid to flow from the outside of the protective casing 2 into the interior of the protective casing 2, while also having the effect of partially blocking large particles of impurities in the fluid, such as sand, etc. An annular accommodating cavity 3 is formed between the base pipe 1 and the protective shell 2, and the accommodating cavity 3 is filled with pre-filled particle units 4. The upper end of the protective case 2 has an upper sealing portion for sealing the upper end of the accommodation chamber 3. The lower end of the protective case 2 has a lower sealing portion for sealing the lower end of the accommodation chamber 3. In a possible embodiment, the outer sidewall of the protective case 2 may have a concave blocking portion, the upper end and the lower end of which are connected to the sidewall of the protective case 2, and a gap is formed between the left end and the right end of the blocking portion and the sidewall of the protective case 2 to form the second opening 21.
As shown in fig. 1 and 2, the pre-packed particle units 4 are filled in the containing cavities 3, and the particles in the pre-packed particle units 4 are substantially spherical, so that there must be a void between each particle and the adjacent particle. The pores may provide a filtering effect on the fluid, e.g. a barrier effect on large-sized sand particles in the fluid, while ensuring that the fluid can enter the inside of the base pipe 1 of the screen through the pre-packed particle units 4.
The pre-packed particulate units 4 may comprise ceramsite particles and soluble particles that are soluble in contact with oil or water. The ceramsite and the soluble particles are uniformly mixed and then filled in the accommodating cavity 3. The ceramsite has the functions of forming pores among particles, the surface of the ceramsite is relatively smooth, the sphericity is high, the resistance is relatively small, the argillaceous particles are easy to be produced along with fluid, and the argillaceous particles can be effectively prevented from being retained to block the pores of the pre-filled particle unit 4. In addition, the ceramsite has excellent corrosion resistance, impact resistance and abrasion resistance, can be placed in the stratum for a long time to filter sand grains, is basically not influenced under the condition of the stratum, and still has pores meeting requirements among particles, so that the pre-filled particle unit 4 still has a filtering effect on fluid. When the pores among the particles are blocked or are about to be blocked, when formation fluid flows through the surfaces of the soluble particles, and under the environment of formation temperature, the soluble particles in the soluble particle pre-filled particle units 4 can be slowly dissolved at a preset speed in the formation where the sieve tube is positioned, the volume of the soluble particles is gradually reduced along with the continuous dissolution, and along with the reduction of the volume, the gaps among the particles of the pre-filled particle units 4 in the sieve tube can be slowly increased, so that the bridge plug can be gradually damaged, the sieve tube is effectively prevented from being blocked at the initial production stage, the sieve tube has a self-unblocking function at the initial production stage of forced sand production, the flow capacity of the sieve tube is maintained, and the productivity of an oil well is ensured.
In the process, the preset speed of the soluble particles in the stratum where the screen pipe is located is generally that the mass of the soluble particles dissolved in the average day accounts for less than or equal to 10% of the mass of the original total soluble particles, so that the soluble particles are basically not completely dissolved within about 10 days, sufficient time is reserved for the screen pipe well descending operation, the soluble particles can be prevented from being dissolved too fast, the screen pipe is not blocked after being descended into the stratum or is completely dissolved just descended into the stratum, and the function of self-blocking removal cannot be achieved in the later period.
In the above process, the degree of enlargement of the pores between the particles in the pre-packed particle unit 4 at the formation temperature environmental condition is controlled by controlling the content of the soluble particles. Since the soluble particles are completely dissolved, the volume ratio of the ceramsite to the soluble particles can be controlled to be 4:1 to 99:1, after the soluble particles are dissolved, the gaps among the particles of the pre-filled particle units 4 in the sieve tube can be increased, the bridge plug is gradually damaged, the gaps among the particles of the filled particle units can be prevented from being increased too much, and the sieve tube has a filtering effect on larger sand grains in the fluid.
It is possible to control the chemical composition of the dissolvable particles, and thus the rate of dissolution thereof. For some sand producing wells with slower sand producing speed, the sand producing wells with the sieve pipes which are not easy to be blocked can control the dissolving speed of the soluble particles to be relatively slower. For example, the formation under the well where the screen is located is measured by using an acoustic time difference method, when the acoustic time difference is less than or equal to 312 μ s/m, the formation under the well where the screen is located is stable sandstone which is not easy to produce sand, the dissolving speed of the soluble particles is preset to be that the dissolved mass of the soluble particles accounts for 0-3.6% of the mass of the original total soluble particles every day, and the soluble particles can be completely dissolved in about 30 days. For some sand production wells with high sand production speed and the sieve tube easy to be blocked, the dissolving speed of the soluble particles can be controlled to be relatively high so as to enhance the self-blocking-removing function of the sieve tube and prevent the sieve tube from being blocked in the initial production stage, so that the sieve tube has a powerful self-blocking-removing function in the initial production stage. For example, when the stratum under the screen is measured, when the acoustic wave time difference is greater than or equal to 345 μ s/m, the stratum under the screen is extremely unstable sandstone and is easy to produce sand, the dissoluble particles are dissolved at a preset speed that the mass dissolved in each day accounts for 5 to 10 percent of the mass of the original total dissoluble particles and can be completely dissolved in about 10 to 20 days. When the acoustic wave time difference is less than 345 mus/m and more than 312 mus/m, the stratum under the screen pipe is between stable sandstone and unstable sandstone, the sand is discharged with medium sand, the dissolving speed of the soluble particles is preset, the mass dissolved in each day accounts for 3.6-5% of the mass of the original total soluble particles, and the soluble particles can be completely dissolved in about 20-30 days.
The dissoluble particles can slowly start to be dissolved when the fluid flows through under the condition of the formation temperature environment, so that the dissoluble particles are prevented from being dissolved when meeting oil and water on the ground. Therefore, when the ambient temperature of the soluble particles reaches 50 degrees or more, the soluble particles start to dissolve. In this embodiment, the soluble particles may be made of paraffin wax, which can be slowly dissolved in an oil-water environment of 50 degrees or more. Preferably, the soluble particles start to dissolve when the environmental temperature of the soluble particles reaches 60 degrees or more, and in this embodiment, spherical particles formed by binding stearic acid, ice flower wax, sodium chloride inorganic salt, or insoluble nano-sized particles can be used as the soluble particles. The stearic acid can be animal stearic acid or plant stearic acid, and the plant stearic acid can be extracted from coconut tree. Stearic acid can be slowly and completely dissolved in an oil-water environment with the temperature of 60 ℃ or above. The ice flower wax can be slowly and completely dissolved in oil environment of 60 ℃ and above.
As a practical matter, the ceramsite and the soluble particles can be selected according to the characteristics of the produced sand in the stratum in a proper filling ratio. If the gravel particles of the stratum where the sieve tube is positioned are relatively fine, soluble particles with relatively low content can be selected for filling, so that the sufficient filling density of the ceramsite is ensured, and the sand control failure is avoided. Specifically, when the median diameter of the ceramsite/the median diameter of the formation sand is between 8 and 10, the volume of the soluble particles is between 3% and 5% greater than the volume of the particles in the pre-packed particle units. If the formation sand particles where the screen is located are relatively coarse, a relatively high content of soluble particles can be selected to fill, so that the pores among the ceramic particles are increased, and the screen plugging can be delayed. Specifically, when the median diameter of the ceramsite/the median diameter of the formation sand is less than or equal to 6, the ratio of the volume of the soluble particles to the volume of the particles in the pre-packed particle units is between 8% and 10%. If the formation sand particles in which the screen is located are relatively common, for example, when the median diameter of the ceramsite/the median diameter of the formation sand is between 6 and 8, the volume of the soluble particles is between 5% and 8% greater than the volume of the particles in the pre-packed particle units.
In one possible embodiment, fig. 3 is a schematic view of a screen according to an embodiment of the present invention, partially broken away, in another embodiment, and as shown in fig. 3, the screen may include: and the elastic mechanism 5 is arranged at the uppermost end and/or the lowermost end of the accommodating cavity 3, and can deform and shrink when the elastic mechanism 5 is pressed, so that the total pores among the particles in the pre-filled particle unit 4 are increased, and the increase range of the total pores can be between 0 and 6 percent. After the sieve tube is blocked, the pressure difference between the inside and the outside of the sieve tube is increased, under the action of the pressure difference between the inside and the outside, the pressure of the elastic mechanism 5 which is pressed to a certain degree is increased, the micro deformation of the elastic mechanism 5 is reduced, the pre-filled particle units 4 are driven to move slightly, the pores among the particles in the pre-filled particle units 4 are increased, the sand bridge is damaged, and the self-blocking removal after the sieve tube is blocked is realized. After the blockage is removed, the pressure difference between the inside and the outside of the sieve tube is released, and the elastic mechanism 5 is deformed and recovered. After the screen pipe is plugged again and pressure difference is formed, the elastic mechanism 5 moves slightly again to realize self plugging removal of the pre-filled screen pipe, so that the screen pipe in the embodiment can be used repeatedly without limit. For example, the elastic mechanism 5 may be any substance that is compressed to a reduced volume, such as a rubber-like substance, a spring-like mechanism, or the like.
The screen pipe in this application has following advantage: 1. as the ceramic particles and the soluble particles are tightly filled in the accommodating cavity 3 formed by the base pipe 1 and the protective shell 2 in the processing process, the deformation of the sieve pipe caused by the incompact filling of the accommodating cavity 3 in the running process can be avoided. 2. When the stratum ambient temperature that screen pipe in this application was located reached more than 50 ℃, soluble granule just begins to dissolve, has avoided soluble granule to meet oil, profit just to take place to dissolve at ground or the in-process of going into the well, and then has prolonged the screen pipe from the time of deblocking for the screen pipe has from the deblocking function in the strong sand production stage in the initial stage of production. 3. Compared with other types of mechanical screens, the screen pipe in the application can not be blocked at the initial production stage, and the aim of high and stable production of the initial oil well is ensured. 4. Compared with other types of mechanical sieve tubes, the sieve tube has the advantages that the self-plugging-removing effect and the self-plugging-removing time can be controlled, the processing is simple, the construction is convenient, and the cost is low.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. A screen, comprising:
the base pipe is provided with a first opening on the side wall;
the protective shell is sleeved outside the base pipe, a second opening is formed in the side wall of the protective shell, and an annular accommodating cavity is formed between the base pipe and the protective shell;
a pre-packed particle unit filled in the accommodating cavity, wherein the pre-packed particle unit comprises ceramsite and soluble particles capable of being dissolved by contacting oil or natural gas, and when the median diameter of the ceramsite/the median diameter of the formation sand is less than or equal to 6, the ratio of the volume of the soluble particles to the volume of the particles in the pre-packed particle unit is between 8% and 10%;
when the median diameter of the ceramsite/the median diameter of the formation sand grains is between 6 and 8, the volume of the soluble particles is between 5% and 8% of the volume of the particles in the pre-packed particle units;
when the median diameter of the ceramsite/the median diameter of the formation sand grains is between 8 and 10, the volume of the soluble particles is between 3% and 5% of the volume of the particles in the pre-packed particle units;
when the formation fluid flows across the surface of the soluble particles, and under the formation temperature environment, the soluble particles can be dissolved at a preset speed, so that the gaps among the ceramic particles are gradually increased, and self-plugging removal is realized; when the ambient temperature of the soluble particles reaches 50 ℃ or higher, the soluble particles start to dissolve; the preset speed is that the mass dissolved every day is less than or equal to 10% of the mass of the original total soluble particles, the underground stratum where the sieve tube is located is measured by adopting an acoustic time difference method, when the acoustic time difference is less than or equal to 312 mu s/m, the underground stratum where the sieve tube is located is stable sandstone, the preset speed for dissolving the soluble particles is that the mass dissolved every day is 0-3.6% of the mass of the original total soluble particles, when the acoustic time difference is greater than or equal to 345 mu s/m, the underground stratum where the sieve tube is located is extremely unstable sandstone, and the preset speed for dissolving the soluble particles is that the mass dissolved every day is 5-10% of the mass of the original total soluble particles;
the elastic mechanism is arranged at the uppermost end and/or the lowermost end of the accommodating cavity and can deform and shrink when being pressed, so that the total pore space among the particles in the pre-filled particle unit is enlarged and ranged from 0% to 6%.
2. The screen according to claim 1, wherein the soluble particles begin to dissolve when the ambient temperature of the soluble particles reaches 60 degrees or higher, and the soluble particles are stearic acid or ice flower wax.
3. The screen according to claim 1, wherein the soluble particles are made of paraffin.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398772.7A CN112392447B (en) | 2020-12-04 | 2020-12-04 | Sieve tube |
| PCT/CN2020/136666 WO2022116272A1 (en) | 2020-12-04 | 2020-12-16 | Screen pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398772.7A CN112392447B (en) | 2020-12-04 | 2020-12-04 | Sieve tube |
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| CN112392447A CN112392447A (en) | 2021-02-23 |
| CN112392447B true CN112392447B (en) | 2022-04-19 |
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| WO (1) | WO2022116272A1 (en) |
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| CN113653471A (en) * | 2021-03-25 | 2021-11-16 | 中国石油大学(华东) | Self-adaptive pre-filled ceramsite sand control screen pipe and self-adaptive method |
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| CN112392447A (en) | 2021-02-23 |
| WO2022116272A1 (en) | 2022-06-09 |
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