CN114060020A - Experimental device for simulating oil extraction seepage and preventing dry burning during well drilling plugging - Google Patents
Experimental device for simulating oil extraction seepage and preventing dry burning during well drilling plugging Download PDFInfo
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- CN114060020A CN114060020A CN202010781428.XA CN202010781428A CN114060020A CN 114060020 A CN114060020 A CN 114060020A CN 202010781428 A CN202010781428 A CN 202010781428A CN 114060020 A CN114060020 A CN 114060020A
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- annular groove
- seepage
- dry burning
- pipe body
- side wall
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a device for simulating oil extraction seepage and drilling leak stoppage and preventing dry burning for experiments, which relates to the field of oil and gas development experiment simulation, and the device for simulating oil extraction seepage and drilling leak stoppage and preventing dry burning for experiments comprises: the core-holding device comprises a pipe body extending along the axis direction, wherein the pipe body is provided with an inner cavity for holding a core, the pipe body is provided with a first end and a second end which are opposite to each other, a ring groove is processed in the side wall of the second end of the pipe body, a first through hole communicated with the ring groove is formed in the lower end of the inner side wall of the ring groove, a discharge port communicated with the ring groove is formed in the lower end of the outer side wall of the ring groove, a partition is arranged in the ring groove, and liquid flowing out of the first through hole cannot directly flow downwards to the discharge port due to the partition; the first cover body is used for sealing the first end and is provided with a liquid inlet; the second cover body is arranged at the second end and seals the inner cavity of the pipe body and the annular groove. The problem that the experiment fails because the upper end part of the rock core is in a dry burning state can be solved.
Description
Technical Field
The invention relates to the field of oil and gas development experiment simulation, in particular to an experimental device for simulating oil extraction seepage and drilling plugging dry burning prevention.
Background
When a laboratory is used for drilling, plugging and oil extraction and seepage simulation experiments, in order to reduce the influence of the boundary effect on the test result, a core with a larger size is often adopted as much as possible, and the currently adopted core with a large size can reach about phi 100 mm. Due to the limitation of indoor conditions, the displacement of the displacement pump is limited, conventionally, the pump with the displacement of 6l to 10l/min is large in displacement, in order to simulate the underground conditions, the core loading device is often heated and pressurized, the temperature can reach dozens of degrees to 150 ℃ or even higher, and the pressure can reach dozens of to hundreds of megapascals according to experimental design, so that the problem is brought.
According to the conventional design, fig. 1 is a schematic diagram of a core loading device in the prior art, as shown in fig. 1, one end of the core loading device is a liquid inlet 2 which is connected with an outlet of a displacement pump, and the other end of the core loading device is a discharge port 3, and the discharge port 3 is often designed below or in the middle of the end face of the core loading device. If the discharge port 3 is arranged on the end face of the rock core loading device, a certain space is reserved between the end face of the rock core and an end cover of the rock core loading device, the displacement of the displacement pump is small, so that the displacement is low, the large particles in the liquid sink under the action of self weight, the large particles are easy to accumulate to block a channel, the test slurry returned from the outlet is light, and the obtained test result is distorted.
However, even if the discharge port 3 is designed below or in the middle of the end face of the core loader, another problem is caused, because the displacement of the displacement pump is limited, the test slurry flows away from the outlet at the tail part when the core loader is not filled with the test slurry, and the core loader is heated at a higher temperature, so that a part of the lower end of the core is immersed in the liquid, and the other part of the upper end of the core is in a dry burning state, and the experiment is directly failed.
Disclosure of Invention
In order to overcome the above defects in the prior art, an embodiment of the present invention provides an experimental device for simulating oil recovery seepage and drilling plugging and preventing dry burning, which can solve the problem of experimental failure caused by the dry burning of the upper end part of the core.
The specific technical scheme of the embodiment of the invention is as follows:
the utility model provides a device is prevented burning is prevented to simulation oil recovery seepage flow and well drilling leaking stoppage for experiments, device is prevented burning is prevented to simulation oil recovery seepage flow and well drilling leaking stoppage for experiments includes:
the core-holding device comprises a pipe body extending along an axis direction, wherein the pipe body is provided with an inner cavity for containing a core, the pipe body is provided with a first end and a second end which are opposite to each other, an annular groove is processed in the side wall of the second end of the pipe body, a first through hole communicated with the annular groove is formed in the lower end of the inner side wall of the annular groove, a discharge port communicated with the annular groove is formed in the lower end of the outer side wall of the annular groove, a partition is arranged in the annular groove, and liquid flowing out of the first through hole cannot directly flow downwards to the discharge port due to the partition;
the first cover body is used for sealing the first end and is provided with a liquid inlet;
the second cover body is arranged at the second end and seals the inner cavity of the pipe body and the annular groove.
Preferably, the highest point of the annular groove is higher than or equal to the highest point of the inner cavity.
Preferably, the cross section of the annular groove is rectangular, the side length of the rectangle is greater than or equal to 20mm, and the arc length of the end part of the first through hole is greater than or equal to 20 mm.
Preferably, the aperture of the first through hole is larger than or equal to the aperture of the liquid inlet.
Preferably, when the cross section of the annular groove is rectangular, the shortest side length of the annular groove is greater than or equal to the caliber of the liquid inlet.
Preferably, the caliber of the discharge port is larger than or equal to that of the liquid inlet.
Preferably, the isolating member is disposed between the discharge port and the first through hole, one end of the isolating member is connected to the inner side wall of the annular groove in a sealing manner, and one end of the isolating member is connected to the outer side wall of the annular groove in a sealing manner.
Preferably, the liquid flowing out of the first through hole flows upwards, passes through the highest point of the annular groove and then flows downwards to the discharge port.
The technical scheme of the invention has the following remarkable beneficial effects:
when the simulated oil production seepage and drilling, leaking and dry burning prevention device for experiments is used for experiments, liquid fluid for the simulated oil production seepage or leaking and leaking experiments enters the inner cavity of the pipe body from the liquid inlet and reaches a gap between a core and a second cover body near the second end of the core loading device through the hole of the core sample. Then, the liquid enters the annular groove through the first through hole, the liquid level of the annular groove on the left side of the isolating piece is slowly raised until the liquid level is equal to the liquid level of the rock core in the pipe body, and no liquid exists in the annular groove on the right side of the isolating piece. Along with the increase of the pumping amount of the liquid fluid, the liquid level in the annular groove reaches the highest point, at the moment, the rock core in the pipe body is filled with the liquid, the liquid is continuously pumped, and the liquid enters the annular groove on the right side of the isolating piece through the highest point of the annular groove and flows back to the discharge port downwards along the annular groove, so that the liquid is discharged to the outside. At this moment, even the body is under the high temperature condition, but the inside of rock core is full of liquid all the time, and the inside liquid of rock core can't directly be followed the discharge port and discharged, and causes the inside liquid level of rock core to descend, so this application can effectively avoid the rock core to be in the dry combustion method state under the high temperature condition.
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 prior art core loading apparatus.
FIG. 2 is a cross-sectional view of a section along the axial direction of the experimental device for simulating oil recovery seepage and drilling plugging and dry burning prevention in the embodiment of the present application.
FIG. 3 is a cross-sectional view of a section along the radial direction of the device for simulating oil recovery seepage and drilling plugging and dry burning prevention for experiments in the embodiment of the present application.
Reference numerals of the above figures:
1. a pipe body; 11. a first end; 12. a second end; 13. an inner cavity; 14. an annular groove; 141. an outer sidewall; 142. an inner sidewall; 15. a first through hole; 2. a liquid inlet; 3. an outlet port; 4. a spacer; 5. a first cover body; 6. a second cover body; 7. and (4) a rock core.
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 solve the problem that the upper end part of the core is in a dry burning state to cause the failure of the experiment, the application provides an experimental device for simulating oil recovery seepage and drilling leakage stoppage and preventing dry burning, fig. 2 is a sectional view of the experimental device for simulating oil recovery seepage and drilling leakage stoppage and preventing dry burning along the axial direction section, and fig. 3 is a sectional view of the experimental device for simulating oil recovery seepage and drilling leakage stoppage and preventing dry burning along the radial direction section, as shown in fig. 2 to fig. 3, the experimental device for simulating oil recovery seepage and drilling leakage stoppage and preventing dry burning can include: the core-containing pipe comprises a pipe body 1 extending along an axial direction, wherein the pipe body 1 is provided with an inner cavity 13 for containing a core 7, the pipe body 1 is provided with a first end 11 and a second end 12 which are opposite to each other, an annular groove 14 is processed in the side wall of the second end 12 of the pipe body 1, a first through hole 15 communicated with the annular groove 14 is formed in the lower end of the inner side wall 142 of the annular groove 14, a discharge port 3 communicated with the annular groove 14 is formed in the lower end of the outer side wall 141 of the annular groove 14, a partition piece 4 is arranged in the annular groove 14, and liquid flowing out of the first through hole 15 cannot directly flow downwards to the discharge port 3 through the partition piece 4; a first cover body 5 for sealing the first end 11, wherein the first cover body 5 is provided with a liquid inlet 2; and a second cover 6 arranged at the second end 12, wherein the second cover 6 seals the inner cavity 13 and the annular groove 14 of the tube body 1.
As shown in fig. 2, the pipe body 1 of the experimental simulated oil production seepage and drilling leakage and dry burning prevention device can extend in the axial direction, and when the oil production seepage or leakage simulation experiment is carried out, the axial line is approximately parallel to the horizontal direction. The cross-section of the tubular body 1 can be of different shapes and is not limited in any way here. Preferably, the tube body 1 is generally in a shape of a round tube, the tube body 1 is provided with an inner cavity 13 for accommodating the core 7, and the shape of the inner cavity 13 is matched with that of the core 7. In general, in the experiment, the cores 7 were all cylindrical, and therefore the cavities 13 were also cylindrical.
As shown in fig. 2, the tubular body 1 has a first end 11 and a second end 12 opposite to each other, the first end 11 is located at the left end in the figure, and the second end 12 is located at the right end in the figure. A first cover 5 is provided at the first end 11 to seal the first end 11 of the tube 1. First lid 5 can be dismantled with body 1 and be connected, so, can open first lid 5 to install the required rock core 7 of experiment to body 1 in the inner chamber 13. For example, the first cover 5 can be connected to the tube 1 in a sealing manner by a screw thread. The first cover body 5 is provided with a liquid inlet 2, and the liquid inlet 2 is used for being connected with other pipelines or straight pipes so as to be connected with a displacement pump.
As shown in fig. 3, an annular groove 14 is formed in the side wall of the second end 12 of the tubular body 1, and the annular groove 14 is formed on the end surface of the side wall of the second end 12 of the tubular body 1. The annular groove 14 is formed in a circle around the axis, and the annular groove tends to be annular, and the annular groove is not limited to a specific shape in the present application, and may be an ellipse, a circle, a rectangle, a polygon, and the like. The annular groove 14 has an inner side wall 142 and an outer side wall 141, that is, the inner side wall 142 and the outer side wall 141 of the pipe body 1 form the annular groove 14. The shape of the annular groove 14 is such that the highest point of the annular groove 14 is higher than or equal to the highest point of the inner cavity 13. The lower end of the inner side wall 142 of the annular groove 14 is provided with a first through hole 15 communicated with the annular groove 14, and the inner cavity 13 of the tube body 1 is communicated with the annular groove 14 through the first through hole 15. The lower end is simply intended to ensure that the fluid in the interior 13 of the body 1 is substantially able to flow into the annular groove 14 from the lower end, and does not necessarily have to be the lowermost end of the annular groove 14. In a possible embodiment, the annular groove 14 may be rectangular in cross-section to facilitate direct machining on a machine tool.
As shown in fig. 3, the lower end of the outer side wall 141 of the annular groove 14 is provided with a discharge port 3 communicated with the annular groove 14, the fluid in the annular groove 14 can be discharged to the outside through the discharge port 3, and a pipeline connected at the discharge port 3 has a downward vertical tendency as much as possible, so as to prevent blockage caused by sedimentation of plugging materials in the pipeline. The annular groove 14 is provided with a partition 4, and the partition 4 prevents the liquid flowing out from the first through hole 15 from directly flowing down to the discharge port 3. The liquid flowing out from the first through hole 15 must flow upwards first, and then flow downwards to the discharge port 3 after passing through the highest point of the annular groove 14, so that the fluid in the annular groove 14 must reach the highest point before being discharged through the discharge port 3, and thus, all positions of the core 7 installed in the inner cavity 13 of the tube body 1 can be filled with the liquid, and the dry burning phenomenon caused by the fact that the upper end of the core 7 is not filled with the liquid can be avoided. Specifically, the partition 4 may be disposed between the discharge port 3 and the first through hole 15, one end of the partition 4 is sealingly connected to the inner side wall 142 of the annular groove 14, and one end of the partition 4 is sealingly connected to the outer side wall 141 of the annular groove 14.
As shown in fig. 2, a second cover 6 is disposed at the second end 12 of the tube 1, and the second cover 6 seals the inner cavity 13 and the annular groove 14 of the tube 1. The second cover 6 can be connected to the second end 12 of the pipe body 1 by a threaded connection or a welding connection, and meanwhile, the sealing performance between the two can be ensured during the connection. For example, the second tubular body 1 may have two threaded portions, one threaded portion being screwed onto an internal thread on the inner side wall 142 of the annular groove 14 and the other threaded portion being screwed onto an external thread on the outer side wall 141 of the annular groove 14, so as to achieve the connection and ensure the sealing of the inner side wall 142 and the outer side wall 141 of the annular groove 14. For another example, the second cover 6 is welded to the inner side wall 142 of the annular groove 14, and the second cover 6 is welded to the outer side wall 141 of the annular groove 14, so as to achieve connection and ensure sealing of the inner side wall 142 and the outer side wall 141 of the annular groove 14.
In a preferred embodiment, the tubular body 1 may be made of steel material in order to ensure that the tubular body 1 can withstand the experimental conditions in the high pressure state. In order to ensure the pressure bearing capacity of the annular groove 14, the wall thickness of the outer side wall 141 or the inner side wall 142 of the annular groove 14 needs to be greater than or equal to 10mm, so that accidents caused by rupture due to too small wall thickness can be avoided.
In a preferred embodiment, the annular groove 14 may have a rectangular cross section with a side length of 20mm or more, and the end of the first through hole 15 has a circular arc cross section with a guiding function and an arc length of 20mm or more. By the mode, the problem that the plugging slurry passing through the rock core 7 is not easy to discharge smoothly or the annular groove 14 is blocked can be effectively prevented.
In a possible embodiment, the aperture of the first through hole 15 may be equal to or larger than the aperture of the liquid inlet 2. The inner diameter of the annular groove 14 may be equal to or greater than the orifice diameter of the liquid inlet 2. The diameter of the discharge port 3 may be equal to or larger than the diameter of the liquid inlet 2. During the experiment of plugging, plugging slurry is pumped into the core 7 in the inner cavity 13 of the pipe body 1 from the liquid inlet 2, so that a sample of the core 7 is subjected to plugging test, wherein the plugging slurry is a fluid substance formed by adding granular, flaky or fibrous inert materials with certain strength and different specifications into drilling fluid according to a certain formula and a proper concentration. Preferably, the caliber of the discharge port 3 is slightly larger than the caliber of the first through hole 15 and the inner diameter of the annular groove 14, for example, the caliber of the discharge port 3 may be 22mm or more. By means of the mode, the phenomenon that the leaking stoppage slurry passing through the rock core 7 is not easy to discharge smoothly, so that the rock core 7 loading device is blocked, and experimental errors or errors are caused.
When the device for simulating oil extraction seepage and drilling, leaking and dry burning prevention for experiments is used for experiments, liquid fluid for the oil extraction seepage or leaking stoppage simulation experiments enters the inner cavity 13 of the pipe body 1 from the liquid inlet 2 and reaches a gap between the rock core 7 and the second cover body 6 near the second end 12 of the rock core 7 loading device through the hole of the rock core 7 sample. Then, the liquid enters the annular groove 14 through the first through hole 15, the liquid level of the annular groove 14 on the left side of the isolating piece 4 slowly rises until the liquid level is equal to the liquid level of the core 7 in the pipe body 1, and the annular groove 14 on the right side of the isolating piece 4 is free of liquid. With the increase of the pumping amount of the liquid fluid, the liquid level in the annular groove 14 reaches the highest point, at the moment, the core 7 in the pipe body 1 is filled with the liquid, the liquid is continuously pumped, enters the annular groove 14 on the right side of the partition 4 through the highest point of the annular groove 14, flows back to the discharge port 3 along the annular groove 14, and is discharged to the outside. Optionally, it may be returned to the feed tank of the displacement pump. At this moment, even the body 1 is under the high temperature condition, but the inside of rock core 7 is full of liquid all the time, and the inside liquid of rock core 7 can't directly be followed discharge port 3 and discharged, and causes the inside liquid level of rock core 7 to descend, so this application can effectively avoid the dry combustion method state of rock core 7 under the high temperature condition.
When adopting the rock core 7 loading attachment of this application to test, the axis of body 1 need transversely place, and it can not vertically place. If the plugging device is vertically placed directly, plugging slurry, plugging particles and the like injected into the rock core 7 loading device directly flow out from the lower discharge port 3 during a plugging experiment, so that the plugging experiment on the rock core 7 cannot be completely carried out, and the plugging effect of various materials is further judged. Even if the device is modified so that the inlet 2 is at the upper end and the outlet 3 is led to the upper end via a corresponding line or channel, another problem arises. That is because the discharge capacity of pump is effective, and is lower at the velocity of flow of liquid fluid in body 1, and the large granule lost circulation material sedimentation rate is higher than the fluid speed of returning upward, and the downward subsidence easily appears in the large granule lost circulation material, leads to rock core 7 to be blockked up very fast, can't accomplish the experiment purpose, also can lead to pump pressure to rise in the short time suddenly and sharply, probably causes the damage of equipment.
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.
Claims (8)
1. The utility model provides a device is prevented burning is prevented to simulation oil recovery seepage flow and well drilling leaking stoppage for experiments which characterized in that, device is prevented burning is prevented to simulation oil recovery seepage flow and well drilling leaking stoppage for experiments includes:
the core-holding device comprises a pipe body extending along an axis direction, wherein the pipe body is provided with an inner cavity for containing a core, the pipe body is provided with a first end and a second end which are opposite to each other, an annular groove is processed in the side wall of the second end of the pipe body, a first through hole communicated with the annular groove is formed in the lower end of the inner side wall of the annular groove, a discharge port communicated with the annular groove is formed in the lower end of the outer side wall of the annular groove, a partition is arranged in the annular groove, and liquid flowing out of the first through hole cannot directly flow downwards to the discharge port due to the partition;
the first cover body is used for sealing the first end and is provided with a liquid inlet;
the second cover body is arranged at the second end and seals the inner cavity of the pipe body and the annular groove.
2. The experimental simulated oil recovery seepage and drilling plugging anti-dry burning device as claimed in claim 1, wherein the highest point of the annular groove is higher than or equal to the highest point of the inner cavity.
3. The experimental simulated oil recovery seepage and drilling leakage and dry burning prevention device as claimed in claim 1, wherein the cross section of the annular groove is rectangular, the side length of the rectangle is greater than or equal to 20mm, and the arc length of the end part of the first through hole is greater than or equal to 20 mm.
4. The experimental simulated oil recovery seepage and drilling plugging and dry burning prevention device as claimed in claim 1, wherein the caliber of the first through hole is greater than or equal to the caliber of the liquid inlet.
5. The experimental simulated oil recovery seepage and drilling plugging and dry burning prevention device as claimed in claim 1, wherein when the cross section of the annular groove is rectangular, the shortest side length of the annular groove is greater than or equal to the caliber of the liquid inlet.
6. The experimental simulated oil recovery seepage and drilling plugging anti-dry burning device as claimed in claim 1, wherein the caliber of the discharge port is greater than or equal to the caliber of the liquid inlet.
7. The experimental simulated oil production seepage and drilling plugging and dry burning prevention device as claimed in claim 1, wherein the isolation member is arranged between the discharge port and the first through hole, one end of the isolation member is connected with the inner side wall of the annular groove in a sealing manner, and one end of the isolation member is connected with the outer side wall of the annular groove in a sealing manner.
8. The experimental simulated oil recovery seepage and drilling plugging and dry burning prevention device as claimed in claim 1, wherein the liquid flowing out from the first through hole flows upwards first, passes through the highest point of the annular groove and then flows downwards to the discharge port.
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| CN202010781428.XA CN114060020B (en) | 2020-08-06 | 2020-08-06 | Experimental oil extraction seepage simulating and well drilling plugging dry burning preventing device |
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| CN202010781428.XA CN114060020B (en) | 2020-08-06 | 2020-08-06 | Experimental oil extraction seepage simulating and well drilling plugging dry burning preventing device |
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