High-reliability water pumping test device for hydrogeological drilling

Abstract

The utility model belongs to the technical field of hydrogeological tests, and particularly discloses a high-reliability water pumping test device for hydrogeological drilling, which is characterized in that a plurality of filter holes penetrating through the inside and the outside are formed in the wall of an annular sleeve, a deep-well pump is slidably arranged in an inner cavity of the annular sleeve, a drill bit is fixed at the bottom end of the annular sleeve, and an annular pipe cap is fixed at the top end of the annular sleeve; the top end of the deep-well pump is fixedly connected with the annular pipe cap, the top end of the annular pipe cap is provided with a drill rod catcher connected with a drill rod, and the top of the outer wall of the annular pipe cap is provided with a cable hole penetrating through a deep-well pump cable. During a hydrogeological water pumping test, the deep-well pump arranged in the annular pipe sleeve can be prevented from being damaged by falling blocks in a hole when the pump is lifted or lowered and water is pumped, the drill bit at the bottom can drill downwards to sweep the falling blocks in the hole, and the annular pipe sleeve with the filter holes can prevent large-particle rock fragments from entering the deep-well pump, so that the service life of the deep-well pump is prolonged, and the service life of the deep-well pump is prolonged. The water pumping test device has the advantages of being simple in structure, capable of being used repeatedly, high in reliability and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogeological tests, and in particular relates to a high-reliability water pumping test device for hydrogeological drilling which has simple structure, is reusable, has high reliability and long service life. Background Art

[0002] Pumping test is one of the tests that must be conducted in hydrogeological drilling, and is one of the important means to obtain the permeability and water-richness of the aquifer. An effective pumping test not only provides important calculation parameters for the water inflow of mines and foundation pits, but also indicates the direction of water supply for engineering, urban and ecological construction. Therefore, it is very necessary to equip reasonable pumping test equipment to ensure the smooth progress of the pumping test. Reasonable equipment can not only provide protection for deep well pumps, but also reduce the cost of pumping tests. It is not only the key to the success of pumping tests, but also an effective measure for cost control.

[0003] As far as hydrogeological work is concerned, except for the boreholes reserved as long-term observation holes, water supply wells and precipitation wells, all hydrogeological boreholes need to be backfilled after the pumping test. After the construction of traditional hydrogeological boreholes is completed, wall protection pipes and filter pipes must be placed below to ensure the stability of the borehole wall to support the pumping test. After the pumping test, these wall protection pipes and filter pipes are affected by the filling of the pipe wall or the shrinkage of the hole wall in the formation. Most of them cannot be pulled out and reused, resulting in great waste. In order to save costs, most construction teams will take risks and choose bare hole pumping according to the integrity of the formation during the actual operation. Under normal circumstances, groundwater has a certain supporting effect on the stability of the hole wall. When the groundwater level is high, the stability of the hole wall is better. During the pumping test, the water level in the hole drops and the osmotic pressure of the hole wall increases. During the pumping test, the hole wall often falls off, and the falling blocks jam the deep well pump, which easily leads to the deep well pump being unable to be removed or damaged after removal, resulting in great waste. Secondly, during the process of bare hole pumping, a lot of rock debris and fragments will seep out of the rock fissures. These rock debris and fragments are large in size. If they are directly sucked into the deep well pump, they will cause the impeller to wear or even jam, making the pumping test impossible to complete or the deep well pump unable to perform the pumping test at maximum power, resulting in certain defects in the parameters obtained by the test. Furthermore, during bare hole pumping, due to the prominent phenomena of broken rock formations and hole wall collapse, when the lower deep well pump encounters a block drop or diameter change position, the pump body is placed on the edge of the block drop or diameter change, which easily leads to the deep well pump being unable to be lowered to the appropriate position. Frequent pumping to sweep the hole not only greatly wastes working time and increases construction costs, but also frequently starting and lowering the pump can easily cause damage to the deep well pump, delaying the pumping test. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model has developed a high-reliability pumping test device for hydrogeological drilling that can carry a deep well pump to sweep the borehole and filter rock debris and fragments. The device can not only effectively protect the deep well pump from damage caused by falling blocks, but the annular casing and the drill bit at the bottom can also effectively filter debris and fragments with larger block diameters. Moreover, when falling blocks and drill jamming occur, the drilling rig can be used to repeatedly stir the entire device without damaging the deep well pump, which greatly reduces the loss rate of the deep well pump, saves construction costs, and saves construction time.

[0005] The utility model is implemented as follows: it comprises a drill bit, an annular sleeve, a deep well pump and an annular pipe cap, a pipe wall of the annular sleeve is provided with a plurality of filter holes penetrating inside and outside, the deep well pump is slidably arranged in the inner cavity of the annular sleeve, the drill bit is detachably fixedly arranged at the bottom end of the annular sleeve, the annular pipe cap is detachably fixedly arranged at the top end of the annular sleeve, the top end of the deep well pump is detachably fixedly connected to the annular pipe cap, the top end of the annular pipe cap is provided with a drill pipe handle connected with a drill pipe, and the outer wall top of the annular pipe cap is provided with a cable hole penetrating a cable of the deep well pump.

[0006] Furthermore, the drill bit includes a drill bit body, cutting teeth, and a water hole. The drill bit body is an annular structure with a closed bottom. The cutting teeth are provided with at least two and are fixedly arranged at intervals at the bottom of the drill bit body. The water hole is provided with multiple cutting teeth that penetrate inside and outside and are arranged at the bottom of the drill bit body. The top opening of the drill bit body is connected to the inner cavity of the annular casing.

[0007] Furthermore, an external threaded portion I is provided on the upper portion of the outer wall of the drill body, and an internal threaded portion I is provided on the lower portion of the inner wall of the annular sleeve. The drill body is threadedly connected with the internal threaded portion I on the lower portion of the inner wall of the annular sleeve through the external threaded portion I on the upper portion of the outer wall.

[0008] Furthermore, the diameter of the circumscribed circle of the cutting teeth on the drill bit is not less than the outer diameter of the annular sleeve.

[0009] Furthermore, the annular pipe cap also includes a casing connecting section and a deep well pump connecting section. The casing connecting section is arranged at the lower part of the annular pipe cap and the lower part of the inner wall is provided with an internal threaded portion II. The deep well pump connecting section is fixedly arranged at the top end of the casing connecting section and the inner wall is provided with an internal threaded portion III. The annular pipe cap is threadedly connected to the top end of the annular casing through the internal threaded portion II of the casing connecting section, and the annular pipe cap is threadedly connected to the top end of the deep well pump through the internal threaded portion III of the deep well pump connecting section.

[0010] Furthermore, the deep well pump includes a water pump, a motor, and a connecting head. The motor is coaxially fixed at the bottom end of the water pump, and the connecting head is coaxially fixed at the top end of the water pump. The connecting head is a tubular structure and is connected to the water outlet pipe of the water pump. The outer wall of the connecting head is provided with an external threaded portion III that cooperates with the internal threaded portion III of the deep well pump connecting section.

[0011] Furthermore, an elastic sealing ring capable of abutting against the inner wall of the annular sleeve is sleeved on the outer wall of the water pump and / or the motor, and an annular elastic pad capable of abutting against the bottom end of the motor is arranged at the top end of the drill bit.

[0012] Furthermore, the top side wall of the drill pipe adapter is provided with a threaded portion connected to the drill pipe or the top is fixedly provided with a flange I connected to the drill pipe, and the outer diameter of the casing connection section is larger than the deep well pump connection section.

[0013] Furthermore, the annular sleeve is formed by at least two sleeve sections detachably connected end to end.

[0014] Furthermore, a cable fixing seat is arranged in the cable hole of the annular pipe cap, the cable fixing seat is a tubular structure and a flange II is coaxially arranged in the middle, the inner wall of the cable fixing seat is provided with a cushion layer, one end of the cable fixing seat extends into the cable hole and is fixedly connected to the top of the outer wall of the annular pipe cap by a screw passing through the flange II, and the deep well pump cable passes through the cable fixing seat in a tight fit.

[0015] Beneficial effects of the utility model:

[0016] 1. The utility model connects a drill bit, an annular sleeve and an annular pipe cap to form an internally closed whole, and then places the deep well pump in the closed cavity for protection. During the hydrogeological pumping test, the rigid annular sleeve can prevent the deep well pump from being damaged by falling blocks during the lifting or lowering of the pump and the pumping process. By arranging a drill bit at the bottom of the annular sleeve, the drill can be drilled downward to clear the falling blocks in the hole. The annular sleeve with filtering holes can also prevent large-grained rock fragments from entering the deep well pump, thereby reducing or even preventing the impeller of the deep well pump from being worn or even stuck, and effectively improving the reliability of the pumping test and the service life of the water pump.

[0017] 2. The annular casing of the utility model is further composed of several detachable casing sections, so that different types of deep well pumps can be installed by increasing or reducing the number of casing sections, and the deep well pump is placed in a whole with the drill bit, the annular casing and the annular pipe cap, which does not take up much space and is convenient for transportation and storage, and can also protect the deep well pump during transportation or storage.

[0018] 3. The drill bit of the utility model is connected with the annular casing to form a whole. By linkage with the drill rod, the drill rod can control the lifting and drilling of the drill bit, which can not only clear the rock fragments and variable diameter protrusions stuck in the hole wall and smoothly go down to the specified depth for pumping test, but also avoid the rock debris in the formation filling the pipe wall or the hole wall shrinking and cannot be pulled out for reuse. The bottom of the drill bit with a closed bottom can prevent debris and fragments from entering from the bottom, and prevent the deep well pump from falling into the borehole when the connection between the annular pipe cap is unstable, thereby playing a secondary protection effect.

[0019] 4. The drill bit, annular sleeve, annular pipe cap and deep-water pump of the utility model are detachably connected to each other to form a whole. The detachable structure is convenient for daily maintenance and assembly, and can effectively reduce production costs. Moreover, some of the components can be replaced or added as needed to adapt to different deep-water pumps and working environments, thereby making the application more flexible and adaptable.

[0020] In summary, the utility model has the characteristics of simple structure, reusability, high reliability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a half-section structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the deep well pump of the utility model;

[0023] Figure 3 This is an exploded view of the structure of the utility model except for the deep well pump;

[0024] Figure 4 for Figure 1 A partial cross-sectional view of

[0025] Figure 5 This is an enlarged view of the drill bit of the utility model;

[0026] Figure 6 This is a schematic diagram of the cable fixing seat structure of the utility model;

[0027] In the figure: 1-drill bit, 11-drill bit body, 12-cutting teeth, 13-water eyes, 2-annular casing, 21-filter holes, 3-deep well pump, 31-deep well pump cable, 32-water pump, 33-motor, 34-connector, 4-annular pipe cap, 41-drill pipe joint, 42-cable fixing seat, 43-casing connecting section, 44-deep well pump connecting section, 45-flange II, 46-cushion layer, 47-screws, 5-drill pipe. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention belong to the protection scope of the present invention.

[0029] like Figures 1 to 6 As shown, the utility model includes a drill bit 1, an annular sleeve 2, a deep well pump 3, and an annular pipe cap 4. The pipe wall of the annular sleeve 2 is provided with a plurality of filter holes 21 that penetrate inside and outside. The deep well pump 3 is slidably arranged in the inner cavity of the annular sleeve 2. The drill bit 1 is detachably fixedly arranged at the bottom end of the annular sleeve 2. The annular pipe cap 4 is detachably fixedly arranged at the top end of the annular sleeve 2. The top end of the deep well pump 3 is detachably fixedly connected to the annular pipe cap 4. The top end of the annular pipe cap 4 is provided with a drill pipe handle 41 connected to the drill pipe 5. The top of the outer wall of the annular pipe cap 4 is provided with a cable hole that penetrates the deep well pump cable 31.

[0030] The drill bit 1 includes a drill bit body 11, cutting teeth 12, and a water hole 13. The drill bit body 11 is a ring-shaped structure with a closed bottom. At least two cutting teeth 12 are provided and fixedly arranged at intervals at the bottom of the drill bit body 11. The water hole 13 is provided with multiple cutting teeth 12 that penetrate inside and outside and are arranged at the bottom of the drill bit body 11. The top opening of the drill bit body 11 is connected to the inner cavity of the annular sleeve 2.

[0031] The drill body 11 is provided with an external threaded portion I on the upper portion of the outer wall, and the annular sleeve 2 is provided with an internal threaded portion I on the lower portion of the inner wall. The drill body 11 is threadedly connected with the internal threaded portion I on the lower portion of the inner wall of the annular sleeve 2 through the external threaded portion I on the upper portion of the outer wall.

[0032] The diameter of the circumscribed circle of the cutting teeth 12 on the drill bit 1 is not less than the outer diameter of the annular sleeve 2 .

[0033] The water hole 13 at the bottom of the drill body 11 has a hole diameter of ≤18 mm and a porosity of ≥20%.

[0034] The annular pipe cap 4 also includes a casing connecting section 43 and a deep well pump connecting section 44. The casing connecting section 43 is arranged at the lower part of the annular pipe cap 4 and an internal threaded portion II is arranged at the lower part of the inner wall. The deep well pump connecting section 44 is fixedly arranged at the top end of the casing connecting section 43 and an internal threaded portion III is arranged on the inner wall. The annular pipe cap 4 is threadedly connected to the top end of the annular casing 2 through the internal threaded portion II of the casing connecting section 43, and the annular pipe cap 4 is threadedly connected to the top end of the deep well pump 3 through the internal threaded portion III of the deep well pump connecting section 44.

[0035] The total length of the annular pipe cap 4 is 25-35 cm, the length of the casing connecting section 43 is less than 20 cm, the inner diameter of the annular casing 2 is ≥100 mm and the total length is 10-15 cm shorter than the total length of the deep well pump 3 .

[0036] The deep well pump 3 includes a water pump 32, a motor 33, and a connector 34. The motor 33 is coaxially fixed at the bottom end of the water pump 32, and the connector 34 is coaxially fixed at the top end of the water pump 32. The connector 34 is a tubular structure and is connected to the water outlet pipe of the water pump 32. The outer wall of the connector 34 is provided with an external threaded portion III that cooperates with the internal threaded portion III of the deep well pump connecting section 44.

[0037] An elastic sealing ring that can abut against the inner wall of the annular sleeve 2 is sleeved on the outer wall of the water pump 32 and / or the motor 33 , and an annular elastic pad that can abut against the bottom end of the motor 33 is provided at the top end of the drill bit 1 .

[0038] The top side wall of the drill pipe adapter 41 is provided with a threaded portion connected to the drill pipe 5 or the top is fixedly provided with a flange I connected to the drill pipe 5 . The outer diameter of the casing connecting section 43 is larger than the deep well pump connecting section 44 .

[0039] The annular sleeve 2 is formed by at least two sleeve sections detachably connected end to end.

[0040] A cable fixing seat 42 is arranged in the cable hole of the annular pipe cap 4. The cable fixing seat 42 is a tubular structure and a flange II 45 is coaxially arranged in the middle. A cushion layer 46 is arranged on the inner wall of the cable fixing seat 42. One end of the cable fixing seat 42 extends into the cable hole and is fixedly connected to the top of the outer wall of the annular pipe cap 4 by a screw 47 passing through the flange II 45. The deep well pump cable 31 passes through the cable fixing seat 42 in a tight fit.

[0041] The diameter of the filter holes 21 of the annular sleeve 2 is ≤18 mm, and the annular sleeve 2 is provided with no less than 45 filter holes 21 per meter along the length thereof and the porosity is ≥20%.

[0042] The working principle and working process of this utility model:

[0043] like Figures 1 to 6As shown, the manufacturing and installation process is as follows: the annular sleeve 2 is made of a seamless steel pipe with a wall thickness of 4 mm and a diameter of 108 mm, and the threaded portion and the filter hole 21 of the annular sleeve 2 are uniformly manufactured by the processing plant; the annular pipe cap 4 is made by cutting the top of the discarded core tube, and the deep well pump connecting section 44 is welded on the top of the inner wall of the core tube to seamlessly connect with the drill pipe adapter 41, and then an electric drill is used to process a cable hole beside the drill pipe adapter 41 at the top of the core tube, and a cable fixing seat 42 is processed according to the cable hole, and then a rubber or plastic cushion layer 46 is attached to the inner wall of the through hole of the cable fixing seat 42, and then the cable fixing seat 42 is fixed to the cable hole with a screw 47, and finally the deep well pump 3 is slid into the annular pipe cap 4 and the deep well pump cable 31 is passed through the through hole of the cable fixing seat 42 provided with the cushion layer 46. A water hole 13 is machined at the bottom of the PDC drill bit 1 with an electric drill, and then the PDC drill bit 1 is threadedly connected to the bottom end of the annular casing 2, and then the top end of the annular casing 2 is threadedly connected to the annular pipe cap 4. After the components are assembled, a closed cavity with a built-in deep well pump 3 is formed.

[0044] During the pumping test: due to the block falling, if the utility model has a small amount of jamming with the borehole wall during the drilling process, the drilling rig can be slightly pressurized, and the pump can be lowered to the predetermined depth after drilling left and right. During the pumping test, the impeller of the deep well pump 3 did not get stuck or severely worn, and after the test, the deep well pump 3 did not wear or dent; during transportation, the deep well pump 3 was protected by the annular pipe cap 4, the drill bit 1 and the annular pipe cap 4, and was not squeezed by heavy objects to cause damage, and the pump body was well protected.

[0045] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A highly reliable pumping test device for hydrogeological drilling, characterized in that The invention comprises a drill bit (1), an annular sleeve (2), a deep well pump (3), and an annular pipe cap (4); a plurality of filter holes (21) penetrating the inside and the outside are arranged on the pipe wall of the annular sleeve (2); the deep well pump (3) is slidably arranged in the inner cavity of the annular sleeve (2); the drill bit (1) is detachably fixedly arranged at the bottom end of the annular sleeve (2); the annular pipe cap (4) is detachably fixedly arranged at the top end of the annular sleeve (2); the top end of the deep well pump (3) is detachably fixedly connected to the annular pipe cap (4); a drill pipe connector (41) connected to a drill pipe (5) is arranged at the top end of the annular pipe cap (4); and a cable hole for penetrating a deep well pump cable (31) is arranged at the top of the outer wall of the annular pipe cap (4).

2. A highly reliable pumping test device for hydrogeological drilling according to claim 1, characterized in that The drill bit (1) comprises a drill bit body (11), cutting teeth (12), and a water hole (13); the drill bit body (11) is an annular structure with a closed bottom; at least two cutting teeth (12) are provided and fixedly arranged at intervals on the bottom of the drill bit body (11); the water hole (13) is provided with a plurality of cutting teeth (12) penetrating inside and outside and arranged at the bottom of the drill bit body (11); the top opening of the drill bit body (11) is communicated with the inner cavity of the annular sleeve (2).

3. A highly reliable pumping test device for hydrogeological drilling according to claim 2, characterized in that The upper portion of the outer wall of the drill bit body (11) is provided with an external threaded portion I, and the lower portion of the inner wall of the annular sleeve (2) is provided with an internal threaded portion I. The drill bit body (11) is threadedly connected with the internal threaded portion I at the lower portion of the inner wall of the annular sleeve (2) via the external threaded portion I at the upper portion of the outer wall.

4. A high-reliability pumping test device for hydrogeological drilling according to claim 2, characterized in that The diameter of the circumscribed circle of the cutting teeth (12) on the drill bit (1) is not less than the outer diameter of the annular sleeve (2).

5. A highly reliable pumping test device for hydrogeological drilling according to claim 1, 2, 3 or 4, characterized in that The annular pipe cap (4) further comprises a casing connecting section (43) and a deep well pump connecting section (44); the casing connecting section (43) is arranged at the lower part of the annular pipe cap (4) and the lower part of the inner wall is provided with an internal threaded portion II; the deep well pump connecting section (44) is fixedly arranged at the top end of the casing connecting section (43) and the inner wall is provided with an internal threaded portion III; the annular pipe cap (4) is threadedly connected to the top end of the annular casing (2) via the internal threaded portion II of the casing connecting section (43); and the annular pipe cap (4) is threadedly connected to the top end of the deep well pump (3) via the internal threaded portion III of the deep well pump connecting section (44).

6. A highly reliable pumping test device for hydrogeological drilling according to claim 5, characterized in that The deep well pump (3) comprises a water pump (32), a motor (33), and a connector (34); the motor (33) is coaxially fixedly arranged at the bottom end of the water pump (32); the connector (34) is coaxially fixedly arranged at the top end of the water pump (32); the connector (34) is a tubular structure and is connected to a water outlet pipe of the water pump (32); an outer wall of the connector (34) is provided with an external threaded portion III that cooperates with an internal threaded portion III of a deep well pump connecting section (44).

7. A highly reliable pumping test device for hydrogeological drilling according to claim 6, characterized in that An elastic sealing ring capable of abutting against the inner wall of the annular sleeve (2) is sleeved on the outer wall of the water pump (32) and / or the motor (33), and an annular elastic pad capable of abutting against the bottom end of the motor (33) is provided at the top end of the drill bit (1).

8. A high-reliability pumping test device for hydrogeological drilling according to claim 5, characterized in that The top side wall of the drill pipe adapter (41) is provided with a threaded portion connected to the drill pipe (5) or the top is fixedly provided with a flange I connected to the drill pipe (5), and the outer diameter of the casing connection section (43) is larger than the deep well pump connection section (44).

9. A highly reliable pumping test device for hydrogeological drilling according to claim 5, characterized in that The annular sleeve (2) is formed by at least two sleeve sections detachably connected end to end.

10. A highly reliable pumping test device for hydrogeological drilling according to claim 5, characterized in that A cable fixing seat (42) is arranged in the cable hole of the annular pipe cap (4). The cable fixing seat (42) is a tubular structure and a flange II (45) is coaxially arranged in the middle. The inner wall of the cable fixing seat (42) is provided with a cushion layer (46). One end of the cable fixing seat (42) extends into the cable hole and is fixedly connected to the top of the outer wall of the annular pipe cap (4) by a screw (47) passing through the flange II (45). The deep well pump cable (31) passes through the cable fixing seat (42) in a tight fit.

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