Filtering device for hydraulic fracturing ground stress test

Abstract

The utility model provides a filter device for a hydraulic fracturing ground stress test, which relates to the technical field of ground stress test and comprises a bottom plate, a water outlet is arranged on the bottom plate, a filter screen cylinder is mounted on the top end face of the bottom plate, the diameter of the filter screen cylinder is equal to that of the water outlet, a filter pipe is mounted at the top of the bottom plate, and a water inlet is formed in the filter pipe. A water inlet is formed in the top of the filter pipe, a cleaning assembly is arranged in the filter pipe, the device can filter water and clean the filter screen cylinder at the same time, and the problems that after the device is used for a period of time, the filter holes are likely to be blocked, follow-up water cannot pass through the filter pipe, and testing work is affected are solved; and work stopping for cleaning is not needed, so that the test efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of in-situ stress testing, and more specifically, particularly relates to a filtering device for in-situ stress testing by the hydraulic fracturing method. Background Technique

[0002] The hydraulic fracturing method is a technique mainly used for measuring in-situ stress. By pressurizing high-pressure water into the sealed section of a borehole until fractures occur in the rock, the absolute value of in-situ stress can be measured. This method is based on the assumption that under the conditions of brittle, linearly elastic, homogeneous, and isotropic rock, the stress state around the borehole will depend on the original principal stresses, the pressurization parameters of the borehole, and the fracture data obtained from the pressurized hole. The hydraulic fracturing method has been widely used in the fields of hydropower, mining, tunneling, energy, and geoscience research, and has been included in technical specifications of multiple industries at home and abroad.

[0003] Based on the above, the inventor found the following problems: Currently, when conducting in-situ stress testing, a filter pipe is usually arranged between the drill pipe and the push-pull valve, and filter holes are opened on the periphery of the filter pipe to filter impurities such as sediment in the water. However, if there are too many impurities in the water, the filter holes may be blocked after being used for a period of time, resulting in the subsequent water being unable to pass through the filter pipe, affecting the testing work. At this time, it is necessary to stop working for cleaning, reducing the testing efficiency.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and a filtering device for in-situ stress testing by the hydraulic fracturing method is provided, with the expectation of achieving a more practical value. Content of the Utility Model

[0005] The purpose and efficacy of the filtering device for in-situ stress testing by the hydraulic fracturing method of the utility model are achieved by the following specific technical means:

[0006] The filtering device for in-situ stress testing by the hydraulic fracturing method includes a bottom plate, an outlet is opened on the bottom plate, a filter screen cylinder is installed on the top surface of the bottom plate, the diameter of the filter screen cylinder is equal to the diameter of the outlet, a filter pipe is installed on the top of the bottom plate, a water inlet is opened on the top of the filter pipe, and a cleaning component is arranged inside the filter pipe.

[0007] Further, the cleaning component includes a rotating rod installed on the inner wall of the filter pipe, an impeller is sleeved on the periphery of the rotating rod, a turntable is installed at one end of the rotating rod, a limiting rod is installed at a position deviating from the axis of the turntable, a return plate is sleeved on the periphery of the limiting rod, and a first moving rod and a second moving rod are respectively installed on both sides of the return plate.

[0008] Further, a group of limiting plates are installed on the inner wall of the filter tube. One ends of the first moving rod and the second moving rod both penetrate through the limiting plates and extend to the outside. A connecting piece is installed at one end of the second moving rod, and an annular scraping plate is installed on one side of the connecting piece.

[0009] Further, the inner side of the annular scraping plate is covered with bristles, and the bristles are attached to the outer side of the filter screen cylinder.

[0010] Further, a guiding block is installed on one side of the annular scraping plate, and a guiding rod is installed on the inner wall of one side of the filter tube. One end of the guiding rod penetrates through the guiding block and is connected to the inner wall of the other side of the filter tube.

[0011] Further, threaded holes are formed in the inner walls of the bottom plate and the filter tube, and bolts are installed inside the threaded holes.

[0012] Further, rust inhibitors are coated on the surfaces of the bottom plate and the filter tube.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. Through the combined use of the impeller, the rotating rod, the turntable, the limiting rod, the loop-shaped plate, the second moving rod and the annular scraping plate, when the high-pressure water flow enters the filter tube from the water inlet, the impact force of the water flow drives the impeller to rotate. At this time, the rotating rod will rotate together with the rotation of the impeller. The rotating rod drives the turntable to rotate, and the limiting rod also rotates together. At this time, the limiting rod slides back and forth on the inner wall of the loop-shaped plate and drives the loop-shaped plate to move up and down. Further, the second moving rod drives the annular scraping plate to perform a reciprocating up and down movement. The bristles on the inner side of the annular scraping plate clean the impurities on the outer wall of the filter screen cylinder, so that the impurities fall into the filter tube. Through the above steps, the filter screen cylinder can be cleaned while the water is flowing in, avoiding the problem that the filter holes may be blocked after using for a period of time due to excessive impurities in the water, resulting in the subsequent water being unable to pass through the filter tube and affecting the test work, and there is no need to stop working for cleaning, improving the test efficiency.

[0015] 2. Through the design of the threaded holes and bolts, when it is necessary to replace the filter screen cylinder or clean the accumulated impurities in the filter tube, the bolts can be screwed to disassemble the bottom plate and the filter tube, which is convenient for maintenance and brings convenience to the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the filtering device for the hydraulic fracturing method in-situ stress test of the utility model.

[0017] Figure 2 is a plan schematic diagram of the filtering device for the hydraulic fracturing method in-situ stress test of the utility model.

[0018] Figure 3It is a schematic sectional view of the filtering device for in-situ stress measurement by hydraulic fracturing method of the present utility model.

[0019] Figure 4 It is a schematic three-dimensional view of the cleaning assembly of the filtering device for in-situ stress measurement by hydraulic fracturing method of the present utility model.

[0020] Figure 5 It is the filtering device for in-situ stress measurement by the new hydraulic fracturing method of the present utility model Figure 3 and the enlarged schematic view of point A therein.

[0021] In the figure, the corresponding relationship between the component names and the drawing reference numbers is as follows:

[0022] 1. Bottom plate; 2. Water outlet; 3. Filter screen cylinder; 4. Filter pipe; 5. Water inlet; 6. Rotating rod; 7. Impeller; 8. Turntable; 9. Limit rod; 10. Return-shaped plate; 11. First moving rod; 12. Second moving rod; 13. Limit plate; 14. Connecting piece; 15. Annular scraping plate; 16. Guide block; 17. Guide rod; 18. Threaded hole; 19. Bolt. Specific embodiments

[0023] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0024] In the description of the present utility model, unless otherwise specified, "a plurality" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Example:

[0027] As shown in the attached Figure 1 to the attached Figure 5As shown in the figure:

[0028] The utility model provides a filtering device for in-situ stress testing by hydraulic fracturing, which comprises a bottom plate 1. An outlet 2 is arranged on the bottom plate 1. A filter screen cylinder 3 is installed on the top surface of the bottom plate 1. The diameter of the filter screen cylinder 3 is equal to that of the outlet 2. A filter pipe 4 is installed on the top of the bottom plate 1. An inlet 5 is arranged at the top of the filter pipe 4. A cleaning component is arranged inside the filter pipe 4.

[0029] Among them, the cleaning component includes a rotating rod 6 installed on the inner wall of the filter pipe 4. An impeller 7 is sleeved on the periphery of the rotating rod 6. A turntable 8 is installed at one end of the rotating rod 6. A limiting rod 9 is installed at a position deviating from the axis of the turntable 8. A return plate 10 is sleeved on the periphery of the limiting rod 9. A first moving rod 11 and a second moving rod 12 are respectively installed on both sides of the return plate 10.

[0030] Among them, a group of limiting plates 13 are installed on the inner wall of the filter pipe 4. One ends of the first moving rod 11 and the second moving rod 12 penetrate through the limiting plates 13 and extend to the outside. A connecting piece 14 is installed at one end of the second moving rod 12. An annular scraping plate 15 is installed on one side of the connecting piece 14. Through the combined use of the impeller 7, the rotating rod 6, the turntable 8, the limiting rod 9, the return plate 10, the second moving rod 12 and the annular scraping plate 15, when high-pressure water flow enters the filter pipe 4 from the inlet 5, the impact force of the water flow drives the impeller 7 to rotate. At this time, the rotating rod 6 will rotate together with the rotation of the impeller 7. The rotating rod 6 drives the turntable 8 to rotate, and the limiting rod 9 also rotates together. At this time, the limiting rod 9 slides back and forth on the inner wall of the return plate 10 and drives the return plate 10 to move up and down. Furthermore, the second moving rod 12 drives the annular scraping plate 15 to perform reciprocating up and down movements. The bristles on the inner side of the annular scraping plate 15 clean the impurities on the outer wall of the filter screen cylinder 3, so that the impurities fall into the filter pipe 4. Through the above steps, the filter screen cylinder 3 can be cleaned while water is flowing in, avoiding the problem that the filter holes may be blocked after a period of use due to excessive impurities in the water, resulting in the subsequent water being unable to pass through the filter pipe 4 and affecting the testing work, and there is no need to stop working for cleaning, improving the testing efficiency.

[0031] Among them, the inner side of the annular scraping plate 15 is covered with bristles, and the bristles are attached to the outer side of the filter screen cylinder 3.

[0032] Among them, a guiding block 16 is installed on one side of the annular scraping plate 15. A guiding rod 17 is installed on the inner wall of one side of the filter pipe 4. One end of the guiding rod 17 penetrates through the guiding block 16 and is connected to the inner wall of the other side of the filter pipe 4. Through the combined use of the guiding block 16 and the guiding rod 17, the movement of the annular scraping plate 15 is smoother and more convenient to use.

[0033] Among them, threaded holes 18 are provided in the inner walls of the bottom plate 1 and the filter pipe 4. A bolt 19 is installed inside the threaded hole 18. Through the design of the threaded hole 18 and the bolt 19, when the filter screen cylinder 3 needs to be replaced or the impurities accumulated in the filter pipe 4 need to be cleaned, the bolt 19 can be turned to disassemble the bottom plate 1 and the filter pipe 4, which is convenient for maintenance and brings convenience to the staff.

[0034] Among them, the surfaces of the bottom plate 1 and the filter pipe 4 are coated with an anti-rust agent. Through the design of the anti-rust agent, the erosion of each component by the water flow can be reduced, the corrosion and aging of the material can be slowed down, and the service life of the device is extended.

[0035] The specific usage method and function of this embodiment:

[0036] First, check the integrity of the device. After confirming that there is no problem, it can be used. Connect the water inlet 5 to the drill pipe and the water outlet 2 to the in-situ stress testing device. When the high-pressure water flow enters the filter pipe 4 from the water inlet 5, the impact force of the water flow drives the impeller 7 to rotate. At this time, the rotating rod 6 will rotate together with the rotation of the impeller 7. The rotating rod 6 drives the turntable 8 to rotate, and the limiting rod 9 also rotates together. At this time, the limiting rod 9 slides back and forth on the inner wall of the loop plate 10 and drives the loop plate 10 to move up and down. Furthermore, the moving rod two 12 drives the annular scraping plate 15 to perform a reciprocating up and down movement. The bristles on the inner side of the annular scraping plate 15 clean the impurities on the outer wall of the filter screen cylinder 3, so that the impurities fall into the filter pipe 4. Through the above steps, the filter screen cylinder 3 can be cleaned while the water is flowing in, avoiding the problem that the filter holes may be blocked after using for a period of time due to too many impurities in the water, resulting in the subsequent water being unable to pass through the filter pipe 4 and affecting the testing work. Moreover, there is no need to stop working for cleaning, which improves the testing efficiency. When the filter screen cylinder 3 needs to be replaced or the impurities accumulated in the filter pipe 4 need to be cleaned, the bolt 19 can be turned to disassemble the bottom plate 1 and the filter pipe 4, which is convenient for maintenance and brings convenience to the staff.

[0037] The embodiments of the present utility model are given for the purpose of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A filtering device for hydraulic fracturing ground stress testing, comprising a bottom plate (1), characterized in that: The bottom plate (1) is provided with a water outlet (2), a filter cylinder (3) is installed on the top surface of the bottom plate (1), the diameter of the filter cylinder (3) is equal to the diameter of the water outlet (2), a filter tube (4) is installed on the top of the bottom plate (1), a water inlet (5) is provided on the top of the filter tube (4), and a cleaning component is arranged inside the filter tube (4).

2. The filtering device for hydraulic fracturing ground stress testing according to claim 1, characterized in that: The cleaning assembly comprises a rotating rod (6) mounted on the inner wall of the filter tube (4), an impeller (7) being mounted on the periphery of the rotating rod (6), a rotating disk (8) being mounted on one end of the rotating rod (6), a limiting rod (9) being mounted at a position offset from the axis of the rotating disk (8), a circular plate (10) being mounted on the periphery of the limiting rod (9), and a moving rod 1 (11) and a moving rod 2 (12) being mounted on both sides of the circular plate (10), respectively.

3. The filtering device for hydraulic fracturing ground stress testing according to claim 2, characterized in that: A group of limiting plates (13) are installed on the inner wall of the filter tube (4); one end of the moving rod 1 (11) and the moving rod 2 (12) pass through the limiting plates (13) and extend to the outside; one end of the moving rod 2 (12) is installed with a connecting piece (14); one side of the connecting piece (14) is installed with an annular scraper (15).

4. The filtering device for hydraulic fracturing geostress testing according to claim 3, characterized in that: The inner side of the annular scraper (15) is covered with bristles, and the bristles are in contact with the outer side of the filter cylinder (3).

5. The filtering device for hydraulic fracturing geostress testing according to claim 3, characterized in that: A guide block (16) is installed on one side of the annular scraper (15), a guide rod (17) is installed on the inner wall of one side of the filter tube (4), and one end of the guide rod (17) passes through the guide block (16) and is connected to the inner wall of the other side of the filter tube (4).

6. The filtering device for hydraulic fracturing ground stress testing according to claim 1, characterized in that: The bottom plate (1) and the inner wall of the filter tube (4) are both provided with threaded holes (18), and bolts (19) are installed inside the threaded holes (18).

7. The filtering device for hydraulic fracturing geostress testing according to claim 1, characterized in that: The surfaces of the bottom plate (1) and the filter tube (4) are coated with a rust inhibitor.

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