CN215408610U - Water pressure test device for ultra-deep drilling hole - Google Patents

Abstract

The utility model discloses a water pressing test device for an ultra-deep borehole, which comprises a drill rod joint, a core pipe, a water pressing core pipe, a core pipe sleeve, a high-low pressure transition cavity pipe, a water stopping cavity pipe and a capsule joint, wherein the core pipe is connected with the core pipe; the drill rod joint, the core pipe and the water pressing core pipe are sequentially connected from top to bottom and are coaxially arranged, and the drill rod joint, the core pipe and the water pressing core pipe are hollow to form an internal flow passage which can be sequentially communicated; the core tube sleeve is sleeved outside the core tube, and an axial cavity is formed in the side part of the core tube sleeve to form a first overflowing channel; a second overflowing channel is formed in the side part of the high-low pressure transition cavity tube; a third overflowing channel is formed in the side part of the water-stopping cavity pipe; the capsule joint is arranged at the lower end of the water-stopping cavity pipe. According to the utility model, two independent waterway channels are designed, wherein one waterway channel is opened or closed, and the other waterway channel is simultaneously closed or opened, so that the real-time switching action of the cut-off function can be realized through simple operation, and the purposes of opening or closing the water filling channel of the embolism capsule and simultaneously closing or opening the water pressing channel of the test hole section are achieved.

Description

Water pressure test device for ultra-deep drilling hole

Technical Field

The utility model relates to water pressure test equipment for geological exploration of ultra-deep drill holes in hydraulic and hydroelectric engineering, in particular to a water pressure test device for ultra-deep drill holes.

Background

The ultra-deep borehole water-pressure test is an important work content for obtaining rock stratum hydrogeological data in water conservancy and hydropower engineering geological exploration. The depth of a drill hole in geological exploration of water conservancy and hydropower engineering is generally less than 100m and is called as a shallow hole, 100-300 m is a medium-length hole, 300-500 m is a deep hole, and more than or equal to 500m is an ultra-deep hole.

In the current water conservancy and hydropower engineering geological exploration industry, a water-pressurizing test is implemented in a deep hole, and the technical scheme comprises the following steps that firstly, two independent water supply pipelines are connected in a full hole mode and are respectively and independently responsible for two independent processes of water filling for a tester plug and water pressurizing for a test hole section; or a water supply pipeline is connected in a full hole, and the water pressing test device is connected with a device which is provided with two independent water channels and can be controlled to open, close and convert in due time, so that the water pressing test device is simultaneously responsible for the work of filling water into the plug of the tester and pressing water into the test hole section. The water pressure test is implemented in the ultra-deep hole, a method of connecting two independent water supply pipelines in a full hole is difficult to adopt according to the existing technical means, and only a method of connecting one water supply pipeline with a double (multi) water channel and a conversion device through a water pressure test device is adopted. Due to the actual conditions and special requirements of ultra-deep drilling holes, technical indexes and requirements of the ultra-deep water pressure tester are higher and tighter for various performances of the required in-hole water pressure tester, such as the opening and closing of different waterway channels of the tester, the timely and reliable switching action of the waterway channels, the ultra-high pressure resistant sealing performance of each group of components, the sufficient and reliable pressure relief and drainage of plug capsules, and the like, and the conventional same type of device for the deep hole water pressure tester is difficult to meet the requirements.

With the development of national economy and the improvement of the scientific and technical level, a batch of large-scale hydraulic and hydroelectric engineering propelled by the national level is large in scale, tight in construction period, high in implementation difficulty, complex in geological conditions, more and more ultra-deep drill holes are arranged, but no water pressing test device with mature and stable performance exists in the market. At present, in the field of geological exploration of water conservancy and hydropower engineering, because the water-pressure test work of ultra-deep drilling has great difficulty, a plurality of units commonly analyze drilling water return phenomena or other hydrological data for replacement. In conclusion, research and development and matching of the water conservancy and hydropower exploration industry on the ultra-deep borehole water-pressure test device become the technical problem which needs to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a water pressure test device for an ultra-deep borehole, which can be switched into two independent water channels aiming at the defects of the prior art.

The technical scheme adopted by the utility model is as follows: a water-pressing test device for an ultra-deep borehole comprises a drill rod joint, a core pipe, a water-pressing core pipe, a core pipe sleeve, a high-low pressure transition cavity pipe, a water-stopping cavity pipe and a capsule joint; the drill rod joint, the core pipe and the water pressing core pipe are sequentially connected from top to bottom and are coaxially arranged, and the drill rod joint, the core pipe and the water pressing core pipe are hollow to form an internal flow passage which can be sequentially communicated; the core tube sleeve is sleeved outside the core tube, and an axial cavity is formed in the side part of the core tube sleeve to form a first overflowing channel;

the high-low pressure transition cavity pipe is sleeved outside the core pipe and the water pressing core pipe, the upper end of the high-low pressure transition cavity pipe is connected with the lower end of the core pipe sleeve, the lower end of the high-low pressure transition cavity pipe is connected with the upper end of the water stopping cavity pipe, and a second overflowing channel is formed in the side part of the high-low pressure transition cavity pipe; a water passing cavity is reserved between the inner side wall of the high-low pressure transition cavity tube and the outer wall of the pressurized water core tube;

a third overflowing channel is formed in the side part of the water-stopping cavity pipe; the water-stopping cavity pipe is hollow to form a central cavity, and a water-stopping sleeve and a return spring are arranged in the central cavity; the water stop sleeve is arranged outside the water pressing core pipe; the upper end of the return spring is tightly pressed with the lower end surface of the water stop sleeve, and the lower end of the return spring is connected with a plug installed at the lower end of the water pressing core pipe;

the capsule joint is arranged at the lower end of the water-stopping cavity pipe, the capsule joint is provided with an eccentric hole and a central hole, the upper part of the eccentric hole is communicated with the third overflowing channel, the lower part of the eccentric hole is connected with a high-pressure joint, and the high-pressure joint is communicated with the embolism capsule core pipe and the water-pressing test floral pipe; the central hole is communicated with a central cavity of the water-stopping cavity pipe;

the first overflowing channel, the second overflowing channel, the third overflowing channel and the high-pressure joint are communicated to form a first water channel; the water passing cavity of the high-low pressure transition cavity tube, the water passing channel between the outer wall of the water stopping sleeve and the inner wall of the water stopping cavity tube and the central cavity of the water stopping cavity tube are communicated to form a second water channel.

According to the scheme, a supporting sealing element is arranged between the inner wall of the core pipe sleeve and the outer wall of the core pipe, and a first overflowing hole which can be communicated with a first water guide hole arranged on the core pipe is formed in the supporting sealing element.

According to the scheme, the water pressing core pipe is provided with a second water guide hole for communicating the internal flow channel of the water pressing core pipe with the water passing cavity.

According to the scheme, a water passing channel is arranged between the outer wall of the water stopping sleeve and the inner wall of the water stopping cavity pipe and is communicated with the central cavity of the water passing cavity and the water stopping cavity pipe.

According to the scheme, the upper end face of the core tube sleeve is provided with an end cover, the surface of the end cover is provided with a dust ring pressing plate, and the dust ring pressing plate and the end cover are connected with the core tube sleeve through an inner hexagon screw A; and a dustproof sealing ring is additionally arranged between the inner side of the end cover and the outer wall of the core pipe.

According to the scheme, the supporting sealing element comprises a plurality of spacer bushes and a plurality of V-shaped combined sealing rings, and the spacer bushes and the V-shaped combined sealing rings are arranged at intervals; the upper end and the lower end of the V-shaped combined sealing ring are respectively provided with a support ring, a first overflowing hole is formed in the support ring, and the first overflowing hole can be communicated with a first water guide hole in the core pipe.

According to the scheme, the inner diameter of the high-low pressure transition cavity tube is larger than the outer diameters of the core tube sleeved on the inner side of the high-low pressure transition cavity tube and the pressurized water core tube at the lower end of the core tube; the upper end of the high-low pressure transition cavity tube is connected with the lower end of the core tube sleeve through a screw, and a sealing ring is arranged at the joint; the lower end of the high-low pressure transition cavity pipe is connected with the upper end of the water-stopping cavity pipe through a screw, and a sealing ring is arranged at the joint; a second overflowing channel is formed in the side part of the high-low pressure transition cavity tube; the lower end of the core pipe is connected with the upper end of the pressurized-water core pipe through a thread screw, and the thread screw is positioned in a water passing cavity of the high-low pressure transition cavity pipe.

According to the scheme, the outer sides of the upper end and the lower end of the water stop sleeve are provided with splines; and a plurality of O-shaped sealing rings are axially arranged between the inner wall of the water stop sleeve and the outer wall of the water pressing core pipe.

According to the scheme, the lower end of the water-stopping cavity pipe is connected with the capsule joint by adopting a six-interior-angle screw, and a sealing ring B is arranged at the joint; the return spring is sleeved outside the water pressing core pipe and the plug, the upper end of the return spring is in contact with the water stopping sleeve, and the lower end of the return spring is fixedly connected with the plug.

According to the scheme, the eccentric hole of the capsule joint is connected with the high-pressure joint through the screw thread, and the central hole of the capsule joint is connected with the embolism capsule core pipe through the screw thread.

The utility model has the beneficial effects that:

1. according to the utility model, two independent waterway channels are designed, wherein one waterway channel is opened or closed, and the other waterway channel is simultaneously closed or opened, so that the real-time switching action of the cut-off function can be realized through simple operation, and the purposes of opening or closing the water filling channel of the embolism capsule (both single capsule and double capsules) and simultaneously closing or opening the water pressing channel of the test hole section are achieved.

2. According to the utility model, two waterway channels of the pressurized-water test device can be timely switched in place according to the requirements of two procedures of water filling and expanding plug and test section pressurized water, the ultrahigh-pressure sealing performance of each group of component structures is ensured, the pressure relief and drainage of the plug capsule are sufficient and reliable, and the special requirements of specific conditions of ultra-deep drilling holes on the pressurized-water test device in the holes are met. The device is connected with the ultrahigh pressure resistant double-plug capsule, and can be used for carrying out water-pressing test work on an ultra-deep drilling hole with the depth of more than kilometers.

3. The utility model can be implemented for deep holes or ultra-deep holes by selecting the conventional drilling tool or rope drilling tool drilling process, different drilling hole diameters, the hydraulic test technical scheme of adopting a hydraulic single plug or double plugs and the like, and has wide adaptability.

4. The utility model has the advantages of reasonable design, novel structure, convenient processing, reliable performance, easy operation and reliable test data.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is an enlarged view (first waterway passage communication) at a point a in fig. 1.

Fig. 3 is a schematic structural view illustrating the second waterway passage in this embodiment when communicating with each other.

Fig. 4 is an enlarged view of fig. 3 at b.

Wherein: 1. a drill pipe joint; 2. a socket head cap screw A; 3. a dust ring pressing plate; 4. an end cap; 5. a core tube sleeve; 6. a support ring; 7. a V-shaped combined sealing ring; 8. a long spacer sleeve; 9. a short spacer sleeve; 10. a high and low pressure transition lumen; 11. a socket head cap screw B; 12. a core tube; 13. an O-shaped sealing ring A; 14. a water pressing core pipe; 15. a water stop sleeve; 16. a water-stopping cavity pipe; 17. a return spring; 18. a plug; 19. a capsule joint; 20. a high-pressure joint; 21. a socket head cap screw C; 22. an O-shaped sealing ring B; 23. an O-shaped sealing ring C; 24. an O-shaped sealing ring D; 25. a socket head cap screw D; 26. an O-shaped sealing ring E; 27. an O-shaped sealing ring F; 28. a dustproof sealing ring; 29. an O-shaped sealing ring G; 30. a first water guide hole; 31. a first flow passage; 32. a second flow passage; 33. a third flow passage; 34. a second water guide hole; 35. a first overflow aperture.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

A water-pressing test device for ultra-deep drill holes comprises a drill rod joint 1, a core pipe 12, a water-pressing core pipe 14, a core pipe sleeve 5, a high-low pressure transition cavity pipe 10, a water-stopping cavity pipe 16 and a capsule joint 19; the drill rod joint 1, the core pipe 12 and the pressurized water core pipe 14 are sequentially connected from top to bottom and are coaxially arranged, and the interiors of the drill rod joint, the core pipe 12 and the pressurized water core pipe are hollow to form an internal flow passage which can be sequentially communicated; the core tube sleeve 5 is sleeved outside the core tube 12, an axial cavity is formed in the side portion of the core tube sleeve 5 to form a first overflowing channel 31, a supporting sealing element is arranged between the inner wall of the core tube sleeve 5 and the outer wall of the core tube 12, and a first overflowing hole 35 which can be communicated with a first water guide hole 30 formed in the core tube 12 is formed in the supporting sealing element;

the high-low pressure transition cavity tube 10 is sleeved outside the core tube 12 and the pressurized water core tube 14, the upper end of the high-low pressure transition cavity tube 10 is connected with the lower end of the core tube sleeve 5, the lower end of the high-low pressure transition cavity tube 10 is connected with the upper end of the water stopping cavity tube 16, and a second overflowing channel 32 is formed in the side part of the high-low pressure transition cavity tube 10; a water passing cavity is reserved between the inner side wall of the high-low pressure transition cavity tube 10 and the outer wall of the pressurized water core tube 14; a second water guide hole 34 communicating the flow channel inside the water pressing core pipe 14 with the water passing cavity is formed in the water pressing core pipe 14;

a third overflowing channel 33 is formed in the side part of the water-stopping cavity pipe 16; the water-stopping cavity pipe 16 is hollow to form a central cavity, and a water-stopping sleeve 15 and a return spring 17 are arranged in the central cavity; the water stop sleeve 15 is arranged outside the pressurized water core pipe 14, a water passing channel is arranged between the outer wall of the water stop sleeve 15 and the inner wall of the water stop cavity pipe 16, and the water passing channel is communicated with the water passing cavity and the central cavity of the water stop cavity pipe 16; the upper end of the return spring 17 is pressed with the lower end surface of the water stop sleeve 15, and the lower end of the return spring 17 is connected with a plug 18 arranged at the lower end of the pressurized-water core pipe 14;

the capsule joint 19 is installed at the lower end of the water-stop cavity pipe 16 through a screw (specifically, an inner hexagon screw C21), the capsule joint 19 is provided with an eccentric hole and a central hole, the upper part of the eccentric hole is communicated with the third overflowing channel 33, the lower part of the eccentric hole is connected with the high-pressure joint 20, the high-pressure joint 20 is connected with a high-pressure water filling port of the plug capsule through a high-pressure steel braided pipe, and the plug capsule is filled with high-pressure water to inflate the plug capsule; the central hole is communicated with the embolism capsule core pipe and the pressurized water test floral tube; the central bore communicates with the central chamber of the water shut-off lumen tube 16.

In the utility model, the overflowing hole on the supporting sealing element, the first overflowing channel 31, the second overflowing channel 32, the third overflowing channel 33 and the high-pressure joint 20 are communicated to form a first waterway channel (such as a waterway channel A in figures 1 and 2); the water passing cavity of the high-low pressure transition cavity tube 10, the water passing channel between the outer wall of the water stopping sleeve 15 and the inner wall of the water stopping cavity tube 16 and the central cavity of the water stopping cavity tube 16 are communicated to form a second water channel (such as the water channel B in fig. 3 and 4). When the first water guide hole 30 of the core tube 12 is communicated with the first overflowing hole 35 of the support sealing assembly, the first waterway channel is conducted, and the second waterway channel is closed. The pressurized water core tube 14 moves upwards in the water stop sleeve 15 and the high-low pressure filter cavity tube 10 along with the core tube 12 and the drill rod joint 1 until the outer side of the upper end of the pressurized water core tube 14 is attached to the inner cavity of the high-low pressure transition cavity tube 10, when no room for continuous rising exists, the first water guide hole 30 of the core tube 12 is staggered with the first overflowing hole 35 on the supporting sealing assembly, the second water guide hole 34 on the pressurized water core tube 14 is communicated with the overflowing cavity of the high-low pressure transition cavity tube 10 and the central cavity of the water stop cavity tube 16, at the moment, the second water channel is communicated, and the first water channel is closed.

In the embodiment, the upper end of the core tube 12 is connected with the drill rod joint 1 by adopting a thread, and a sealing ring, specifically an O-shaped sealing ring G29, is arranged at the connection part; the internal flow passage of the core tube 12 communicates with the internal flow passage of the tool joint 1.

Preferably, an end cover 4 is arranged on the upper end face of the core tube sleeve 5, a dust ring pressing plate 3 is arranged on the surface of the end cover 4, and the dust ring pressing plate 3 and the end cover 4 are connected with the core tube sleeve 5 through screws (specifically, socket head cap screws a 2); and a dustproof sealing ring 28 is additionally arranged between the inner side of the end cover 4 and the outer wall of the core pipe 12. The supporting sealing element comprises a plurality of spacer bushes and a plurality of V-shaped combined sealing rings 7, and the spacer bushes and the V-shaped combined sealing rings 7 are arranged at intervals; the upper end and the lower end of the V-shaped combined sealing ring 7 are respectively provided with a support ring 6, a first overflowing hole 35 is formed in the support ring 6, and the first overflowing hole 35 can be communicated with the first water guide hole 30 in the core pipe 12. The spacer comprises a long spacer 8 and a short spacer 9.

In this embodiment, the long V-shaped combined seal ring 7, the support ring 6, the short spacer sleeve 9, the long V-shaped combined seal ring 7, the long spacer sleeve 8, the long V-shaped combined seal ring 7, the support ring 6, the long V-shaped combined seal ring 7, and the short spacer sleeve 9 are sequentially disposed inside the core tube sleeve 5 from top to bottom, and each support sealing member is respectively attached to the outer wall of the core tube 12.

Preferably, the inner diameter of the high-low pressure transition cavity tube 10 is larger than the outer diameters of the core tube 12 sleeved on the inner side of the high-low pressure transition cavity tube and the pressurized water core tube 14 at the lower end of the core tube 12; the upper end of the high-low pressure transition cavity tube 10 is connected with the lower end of the core tube sleeve 5 through a screw (a hexagon socket head cap screw B11), and a sealing ring (such as an O-shaped sealing ring E26 and an O-shaped sealing ring F27 in the figure) is arranged at the joint; the lower end of the high-low pressure transition cavity tube 10 is connected with the upper end of the water-stopping cavity tube 16 through a hexagon socket head cap screw D25 (a sealing ring, specifically an O-shaped sealing ring A13 is arranged on the connecting surface between the high-low pressure transition cavity tube and the water-stopping cavity tube), and a sealing ring (an O-shaped sealing ring D24 in the figure) is arranged at the connecting part; the side part of the high-low pressure transition cavity tube 10 is provided with a second overflowing channel 32; the lower end of the core tube 12 is connected with the upper end of the pressurized-water core tube 14 through a thread screw thread which is positioned in the water passing cavity of the high-low pressure transition cavity tube 10. The lower end of the pressurized water core tube 14 is connected with the plug 18 through a thread screw thread to form a seal.

In this embodiment, the outer sides of the upper and lower ends of the water stop sleeve 15 are spline-shaped, and form a channel with the inner wall of the water-stop cavity tube 16 for water passing; a plurality of sealing rings (4O-shaped sealing rings C23) are arranged between the inner wall of the water stop sleeve 15 and the outer wall of the water pressing core pipe 14 along the axial direction. The lower end of the water-stopping cavity tube 16 is connected with the capsule joint 19 by a six-internal-angle screw C21, and a sealing ring (O-shaped sealing ring B22) is arranged at the joint; the return spring 17 is sleeved outside the pressurized water core pipe 14 and the pressurized water core pipe plug 18, the upper end of the return spring 17 is in contact with the water stop sleeve 15, and the lower end of the return spring 17 is fixedly connected with the plug 18. The eccentric hole of the capsule joint 19 is connected with the high-pressure joint 20 by screw threads, and the central hole of the capsule joint 19 is connected with the plug capsule core pipe by screw threads.

The return spring 17 is in a natural expansion state. The long V-shaped combined sealing ring 7 in the core tube sleeve 5 plays a role in sealing a gap between the outer wall of the core tube 12 and the inner wall of the core tube sleeve 5; a sealing ring (O-shaped sealing ring C23) in the water stop sleeve 15 plays a role in sealing a gap between the pressurized water core pipe 14 and the inner wall of the water stop sleeve 15; the plug 18 and the pressurized water core tube 14 are connected to form a seal, and the seal, a seal ring (O-shaped seal ring B22) at the capsule joint 19 and seal rings (O-shaped seal ring D24 and O-shaped seal ring E26) at the joints of the upper end and the lower end of the high-low pressure transition cavity tube 10 jointly play a role in sealing the gap between the capsule joint 19 and the high-low pressure transition cavity tube 10.

The water pressure test device shown in fig. 1 to 4 is specifically configured as follows:

the drill rod joint 1 is connected with a drill rod drilled at the upper part, and the drill rods of different types are selected from the corresponding drill rod joints 1. The dust ring pressing plate 3, the end cover 4, the core pipe sleeve 5, the core pipe 12, the pressurized water core pipe 14 and the plug 18 form a pressurized water core pipe assembly; the interior of the core pipe 12 is communicated along the axial direction and is sleeved in the core pipe sleeve 5 and the high-low pressure transition cavity pipe 10, and the upper end of the core pipe 12 is communicated with a flow passage in the drill rod joint 1; the middle part of the core tube 12 is provided with a first water guide hole 30, the first water guide hole 30 is communicated with a first overflowing channel 31 at the side part of the core tube sleeve 5 through a first overflowing hole 35 on the support ring 6, the first overflowing channel 31 is sequentially communicated with a second overflowing channel 32 at the side edge of the high-low pressure transition cavity tube 10 and a third overflowing channel 33 at the side part of the water-stop cavity tube 16, the third overflowing channel 33 is communicated with a high-pressure joint 20 at the side edge of the capsule joint 19, and the lower end of the high-pressure joint 20 is communicated with the plug capsule. The water flow flows into the core pipe 12 from the drill rod joint 1, enters a first overflowing channel 31 on the side of the core pipe sleeve 5 through a first water guide hole 30 in the middle of the core pipe 12 and a first overflowing hole 35 on the support ring 6, flows out of the high-pressure joint 20 after passing through a second overflowing channel 32 on the side of the high-low pressure transition cavity pipe 10 and a third overflowing channel 33 on the side of the water-stop cavity pipe 16, and finally enters the plug capsule, and a first water channel is communicated, as shown in fig. 1 and 2.

As shown in fig. 3 and 4, when the core pipe 12, the pressurized water core pipe 14 and the pressurized water core pipe plug 18 rise along with the drill pipe, the first water guide hole 30 on the core pipe 12 is staggered with the first overflowing hole 30 on the support ring 6, at this time, the first overflowing channel 31 on the side edge of the core pipe sleeve 5 is sealed under the action of the long V-shaped combined sealing ring 7, and the first waterway channel is closed. The inner cavity of the pressurized water core tube 14 is communicated with the inner cavity of the core tube 12, and a second water guide hole 34 in the middle of the pressurized water core tube 14 is communicated with a water passing cavity of the high-low pressure transition cavity tube 10; the lower end of the high-low pressure transition cavity tube 10 is provided with a water stop sleeve 15, the upper end and the lower end of the water stop sleeve 15 are arranged in a spline shape, a water passing channel is reserved between the water stop sleeve 15 and the inner wall of the water stop cavity tube 16, the upper end of the water stop sleeve 15 is communicated with the water passing cavity of the high-low pressure transition cavity tube 10, the water outlet at the lower end of the water pressing core tube 14 is connected with a plug 18 to form a seal, the upper end of a return spring 17 is communicated with the lower end of the outer side of the water stop sleeve 15, the lower end of the return spring is communicated with a capsule joint 19, and the lower end of the capsule joint 19 is connected with the plug capsule core tube and a water pressing test flower tube. The water flow flows into the core pipe 12 from the drill pipe joint 1, enters the inner cavity of the pressurized-water core pipe 14 through the lower end of the core pipe 12, enters the water passing cavity of the high-low pressure transition cavity pipe 10 through the second water guide hole 34 of the pressurized-water core pipe 14, flows downwards into the water passing channel between the water stop sleeve 15 and the water stop cavity pipe 16, enters the capsule joint 19 through the inner cavity of the water stop cavity pipe 16, flows into the water inlet interface of the plug capsule core pipe through the water outlet at the lower end of the capsule joint 19, flows to the water outlet of the test section floral tube through the plug capsule core pipe, and the second waterway channel is conducted.

When a conventional drilling tool or a rope drilling tool is adopted for drilling, the upper part of the pressurized water test device is required to be connected with a drill rod joint 1 corresponding to a drill rod of the pressurized water test device; when a hydraulic single-plug method or a hydraulic double-plug method is selected, the lower part of the test device is connected with a corresponding single-plug or double-plug capsule (a shaped product) with technical parameters matched with the test section. The working principle of the utility model is as follows:

(a) and (3) inflating the suppository capsule by pressing water: the pump water is pumped to the water pressure test device to inflate the plug capsule, and the water flow path of the whole drill string in the process is shown in figures 1 and 2, and specifically: the inner diameter hole of the drill rod → the flow passage channel in the drill rod joint 1 → the flow passage channel in the core pipe 12 → the first water guiding hole 30 on the core pipe 12 → the first overflowing hole 35 on the support ring 6 → the first overflowing channel 31 on the side of the core pipe sleeve 5 → the second overflowing channel 32 on the side of the high-low pressure transition cavity pipe 10 → the third overflowing channel 33 on the side of the water-stop cavity pipe 16 → the high-pressure joint 20 → the inner cavity of the plug capsule, and the action of pressurizing water to inflate the plug capsule is started (in the utility model, the connection of the capsule joint 19 and the plug capsule body is the prior art, and the connection of the plug capsule body and the capsule joint 19 is not shown in the attached drawings).

(b) Forming a timely high-pressure stop valve: after the pressure gauge reaches the test pressure value and is basically stable, the embolism capsule is inflated by pressurized water and is pressed by the wall of the hole in a contact manner, and the vertical shaft of the drilling machine is operated to control the drill rod to slowly rise for h; the core pipe sleeve 5, the high-low pressure transition cavity pipe 10, the water-stopping cavity pipe 16 and the capsule joint 19 are connected and assembled into a whole by bolts and are pressed tightly along with the contact of the embolism capsule body and the hole wall to be in a fixed state; the core pipe 12, the pressurized water core pipe 14 and the pressurized water core pipe plug 18 are connected through threads and are sleeved in the test device, the pressurized water core pipe plug can synchronously ascend h along with the drill pipe and the drilling joint 1 through compressing the return spring 17, the outer side of the upper end of the pressurized water core pipe 14 is attached to the inner cavity of the high-low pressure transition cavity pipe 10, and no room for continuous ascending exists. The first water guide hole 30 of the core tube 12 is staggered with the first overflowing hole 35 on the support ring 6, the sealing effect between the outer wall of the core tube 12 and the inner wall of the core tube sleeve 5 is achieved through the V-shaped sealing ring 7, so that the range from the position below the first overflowing hole 35 on the support ring 6 to the inner cavity of the plug capsule body is a high-pressure water sealing area, a first water flow path is sealed, the action of inflating the plug capsule by pressurized water is stopped, and high-pressure water in the inner cavity of the capsule joint is kept not to leak outwards.

(c) Starting a test section formal water pressing test channel: after the core pipe 12, the pressurized-water core pipe 14 and the pressurized-water core pipe plug 18 ascend in place along with the drill pipe, the second water guide hole 34 in the middle of the pressurized-water core pipe 14 leaves the water stop sleeve 15 and is communicated with the internal gap of the high-low pressure transition cavity pipe 10, the sealing of the second water guide hole 34 is released at the same time, the water flow channel is timely converted into a water flow channel for a pressurized-water test of an opening test section, and the water flow path of the whole drill pipe column in the process is as shown in fig. 4: the inner diameter hole of the drill rod → the flow passage in the drill rod joint 1 → the inner flow passage of the core pipe 12 → the inner flow passage of the pressurized water core pipe 14 → the second water guide hole 34 on the pressurized water core pipe 14 → the water passing cavity of the high-low pressure transition cavity pipe 10 → the water passing passage between the outer diameter of the water stop sleeve 15 and the water stop cavity pipe 16 → the central cavity of the water stop cavity pipe 16 → the central hole of the capsule joint 19 → the water inlet interface of the plug capsule core pipe → the water outlet of the test section flower pipe through the plug capsule core pipe. The testing process is prior art and is not described herein.

(d) And (3) pressure relief process: and after the water pressing test is finished, the water pump stops supplying water and opens a water distribution disc valve, the vertical shaft of the drilling machine is operated to press down the whole drill rod for h distance, the core pipe 12, the water pressing core pipe 14 and the water pressing core pipe plug 18 synchronously descend h along with the drill rod until the first water guide hole 30 in the middle of the core pipe 12 is communicated with the first overflowing hole 35 in the support ring 6, the first water flow channel is opened, the function of the stop valve disappears at the right moment, the second water guide hole 34 in the water pressing core pipe 14 returns to the water stop sleeve 15, and sealing is recovered. At the moment, the waterway channel has the same path as a channel in the process of a pressurized water inflation embolism procedure but has the opposite flow direction, the second waterway channel is timely converted into the first waterway channel and plays the function of a drainage channel, and high-pressure water of the small-diameter hole in the inner cavity of the capsule flows out to the water channel of the large-inner-diameter hole of the drill string under the pressure difference, so that the whole pressure relief process is sufficient and reliable.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A water-pressing test device for ultra-deep drill holes is characterized by comprising a drill rod joint, a core pipe, a water-pressing core pipe, a core pipe sleeve, a high-low pressure transition cavity pipe, a water-stopping cavity pipe and a capsule joint; the drill rod joint, the core pipe and the water pressing core pipe are sequentially connected from top to bottom and are coaxially arranged, and the drill rod joint, the core pipe and the water pressing core pipe are hollow to form an internal flow passage which can be sequentially communicated; the core tube sleeve is sleeved outside the core tube, and an axial cavity is formed in the side part of the core tube sleeve to form a first overflowing channel;

the high-low pressure transition cavity pipe is sleeved outside the core pipe and the water pressing core pipe, the upper end of the high-low pressure transition cavity pipe is connected with the lower end of the core pipe sleeve, the lower end of the high-low pressure transition cavity pipe is connected with the upper end of the water stopping cavity pipe, and a second overflowing channel is formed in the side part of the high-low pressure transition cavity pipe; a water passing cavity is reserved between the inner side wall of the high-low pressure transition cavity tube and the outer wall of the pressurized water core tube;

a third overflowing channel is formed in the side part of the water-stopping cavity pipe; the water-stopping cavity pipe is hollow to form a central cavity, and a water-stopping sleeve and a return spring are arranged in the central cavity; the water stop sleeve is arranged outside the water pressing core pipe; the upper end of the return spring is tightly pressed with the lower end surface of the water stop sleeve, and the lower end of the return spring is connected with a plug installed at the lower end of the water pressing core pipe;

the capsule joint is arranged at the lower end of the water-stopping cavity pipe, the capsule joint is provided with an eccentric hole and a central hole, the upper part of the eccentric hole is communicated with the third overflowing channel, the lower part of the eccentric hole is connected with a high-pressure joint, and the high-pressure joint is communicated with the embolism capsule core pipe and the water-pressing test floral pipe; the central hole is communicated with a central cavity of the water-stopping cavity pipe;

the first overflowing channel, the second overflowing channel, the third overflowing channel and the high-pressure joint are communicated to form a first water channel; the water passing cavity of the high-low pressure transition cavity tube, the water passing channel between the outer wall of the water stopping sleeve and the inner wall of the water stopping cavity tube and the central cavity of the water stopping cavity tube are communicated to form a second water channel.

2. The water pressure test device for the ultra-deep borehole of claim 1, wherein a support sealing member is provided between the inner wall of the core tube casing and the outer wall of the core tube, and the support sealing member is provided with a first overflowing hole which can communicate with a first water guide hole provided in the core tube.

3. The ultra-deep borehole water pressure test device as claimed in claim 1, wherein the water pressure core pipe is provided with a second water guide hole communicating the internal flow passage of the water pressure core pipe with the water passing cavity.

4. The water pressure test device for the ultra-deep drill hole as claimed in claim 1, wherein a water passage is provided between the outer wall of the water stop sleeve and the inner wall of the water stop cavity pipe, and the water passage is communicated with the water passing cavity and the central cavity of the water stop cavity pipe.

5. The water pressure test device for the ultra-deep drill hole as claimed in claim 1, wherein an end cover is arranged on the upper end surface of the core tube sleeve, a dust ring pressing plate is arranged on the surface of the end cover, and the dust ring pressing plate and the end cover are connected with the core tube sleeve through an inner hexagon screw A; and a dustproof sealing ring is additionally arranged between the inner side of the end cover and the outer wall of the core pipe.

6. The water pressure test device for the ultra-deep drill hole as claimed in claim 2, wherein the supporting sealing member comprises a plurality of spacers and a plurality of V-shaped combined sealing rings, and the spacers and the V-shaped combined sealing rings are arranged at intervals; the upper end and the lower end of the V-shaped combined sealing ring are respectively provided with a support ring, a first overflowing hole is formed in the support ring, and the first overflowing hole can be communicated with a first water guide hole in the core pipe.

7. The water pressure test device for the ultra-deep borehole of claim 1, wherein the inner diameter of the high-low pressure transition cavity tube is larger than the outer diameters of the core tube sleeved at the inner side of the high-low pressure transition cavity tube and the water pressure core tube at the lower end of the core tube; the upper end of the high-low pressure transition cavity tube is connected with the lower end of the core tube sleeve through a screw, and a sealing ring is arranged at the joint; the lower end of the high-low pressure transition cavity pipe is connected with the upper end of the water-stopping cavity pipe through a screw, and a sealing ring is arranged at the joint; a second overflowing channel is formed in the side part of the high-low pressure transition cavity tube; the lower end of the core pipe is connected with the upper end of the pressurized-water core pipe through a thread screw, and the thread screw is positioned in a water passing cavity of the high-low pressure transition cavity pipe.

8. The water pressure test device for the ultra-deep drill hole according to claim 1, wherein the outer sides of the upper end and the lower end of the water stop sleeve are provided with splines; and a plurality of O-shaped sealing rings are axially arranged between the inner wall of the water stop sleeve and the outer wall of the water pressing core pipe.

9. The ultra-deep borehole water-pressurizing test device as claimed in claim 1, wherein the lower end of the water-stopping cavity pipe is connected with the capsule joint by a six-interior angle screw, and a sealing ring B is arranged at the joint; the return spring is sleeved outside the water pressing core pipe and the plug, the upper end of the return spring is in contact with the water stopping sleeve, and the lower end of the return spring is fixedly connected with the plug.

10. The ultra-deep borehole water pressure test device as recited in claim 1, wherein the eccentric hole of the capsule joint is screwed with the high pressure joint, and the central hole of the capsule joint is screwed with the plug capsule core tube.

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