A hydraulic conveying in-situ testing device and method for directional drilling

Abstract

This invention provides a hydraulically conveyed in-situ borehole testing device and method suitable for directional drilling, relating to the field of rock mechanics testing. The device includes a wireline drill rod, a channel separation device, a guide connection device, a pipeline unlocking device, and a test packer system. The channel separation device has a built-in side inlet channel (test section pressure channel) and a central channel (rubber plug pressure channel). The guide connection device, via hydraulic conveyance, locks at the docking piston, forming the rubber plug pressure channel, driving the packer to expand and seal the test section. After the test, the pipeline unlocking device, via hydraulic conveyance, unlocks the target position, enabling rapid retrieval of the high-pressure hose. This invention eliminates the traditional hose threading process, achieving rapid channel connection and unlocking via hydraulic conveyance, significantly reducing the time consumption and drill jamming risk of in-hole testing in directional drilling, and improving the efficiency and safety of deep hole in-situ testing.

Description

Technical Field

[0001] This invention relates to the field of rock mechanics testing technology, specifically a hydraulic conveying in-situ testing device and method suitable for directional drilling. Background Technology

[0002] Currently, directional drilling technology has been widely applied, but in-hole rock mass testing faces significant risks and challenges. Water pressure testing and hydraulic fracturing stress testing (hereinafter collectively referred to as in-hole hydraulic testing), as important components of in-situ deep borehole testing, often share similar in-hole apparatus structures and testing procedures. Their similarities are mainly reflected in the fact that both tests generally consist of upper and lower expansion plugs and a connecting perforated pipe. During testing, the pipe is pushed to the test section using a drill rod connection. Then, pressure is applied through the plug pressure channel to pressurize the expansion plug, causing it to adhere tightly to the borehole wall and seal the intermediate test section. High-pressure water is then introduced into the test section through the test section pressure channel for measurement.

[0003] Directional boreholes typically have a small or near-horizontal inclination angle. The aforementioned in-hole hydraulic tests are usually conducted using dual-pressure pipelines. The pressure channel is generally achieved by externally binding a pressure hose to a regular drill rod or by internally connecting a through-rope drill rod, while the pressure channel for the test section utilizes the drill rod's internal cavity. Given that directional boreholes in complex formations are more prone to collapse and rockfall under their own weight, the externally bound hose method significantly increases the risk of the testing equipment getting stuck during drilling. Therefore, internally connecting the hose to the through-rope drill rod is safer, but each drill rod connection during drilling requires a hose insertion process, which is cumbersome and time-consuming. To ensure safe operation and save drilling time, this invention proposes a hydraulically conveyed in-hole hydraulic testing device and method suitable for directional boreholes. First, a high-pressure hose is quickly connected and locked to the end of the testing device inside the through-rope drill rod, forming an independent pressure channel. After the test, the lock is released using a hydraulically conveyed unlocking device, allowing the high-pressure hose inside the drill rod to be quickly pulled out. This invention can effectively reduce the time and risk of hydraulic drilling tests using a double-pipeline wire rope drill. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a hydraulic conveying test device and method suitable for directional drilling. By designing a guideable connection device, a hydraulic conveying method is used to control the guide connection device to pull the rear pressure hose to the center docking piston of the packer inside the borehole, achieving self-connection and locking of the pressure hose and the packer, thus forming a hydraulic test plug pressure channel, with the borehole cavity serving as the test section pressure channel. After the borehole hydraulic test is completed, the hydraulic conveying unlocking device releases the locking state between the guide connection device and the center docking piston of the test device, allowing all high-pressure hoses inside the drill rod to be quickly pulled out from the borehole opening. This invention eliminates the steps of inserting, connecting, and removing high-pressure hoses during the installation and disassembly of each drill rod, effectively reducing the time and risk of hydraulic testing in dual-pipeline drilling with wireline drill rods.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A hydraulic conveying in-situ testing device for directional drilling includes a high-pressure hose, a high-flow hose, a drill pipe plugging device, a wireline drill pipe, a pipeline unlocking device, a guide connection device, a docking piston, a channel separation device, and a test packer system.

[0007] One end of the channel separation device is connected to the rope drill rod, and the other end is connected to the test packer system. The channel separation device has a built-in side water inlet channel and a central channel, which respectively form a test section pressure channel and a rubber stopper pressure channel.

[0008] The tail of the docking piston is fixed in the central channel of the channel separation device, and its head is provided with a piston cone and its middle is provided with a piston locking step.

[0009] The guiding connection device is configured to move within the rope drill rod via hydraulic conveying, and its front end is provided with a locking buckle, which can be locked with the piston locking step to seal the rubber plug pressure channel.

[0010] One end of the high-pressure hose is connected to the center connecting rod of the guide connection device, and the other end extends to the outside of the hole and is connected to the pressurization system;

[0011] The pipeline unlocking device is configured to be hydraulically delivered to the guide connection device, and its front end is provided with an unlocking chamber for releasing the locking buckle from the piston locking step;

[0012] The drill pipe sealing device is installed at the borehole end of the rope drill pipe, and it has a central through hole and a lateral through hole, which are used to pass through the high-pressure hose and the pressure channel connecting the test section, respectively.

[0013] The test packer system receives pressure through the rubber stopper pressure channel and then expands to seal the test hole section.

[0014] Furthermore, the test packer system includes a first packer plug, a first center rod, a test section connecting tube, a second packer plug, a second center rod, and a plug sealing component.

[0015] Furthermore, the side water inlet channel of the channel separation device is connected to the inner cavity of the wire rope drill rod, forming a test section pressure channel from the inner cavity of the wire rope drill rod, the side water inlet channel, the water outlet of the test section connecting the test section to the test hole section; the central channel is connected to the piston central through hole of the docking piston, forming a rubber plug pressure channel from the high pressure hose, the central connecting rod, the piston central through hole, the central channel, the diversion channel to the inner cavity of the first and second sealing rubber plugs.

[0016] Furthermore, the guiding connection device also includes a water collection tank, support rollers, and a docking chamber. The water collection port of the water collection tank is obliquely cut. The support rollers are distributed on the outer wall of the water collection tank. The docking chamber can be fitted into the docking piston to form a pressure channel. The locking buckle extends into the water collection tank through the locking plate and the unlocking pressure plate and is elastically connected to the water collection tank through a return spring.

[0017] Furthermore, the pipeline unlocking device also includes a hose centering guide wheel, which is symmetrically installed via an elastic support rod to clamp the high-pressure hose and keep it centered.

[0018] A hydraulic conveying in-situ testing method for directional drilling, using the aforementioned apparatus, comprises the following steps:

[0019] Assembly and Push: Connect the test packer system, channel separation device, docking piston and wire drill rod in sequence, and push them to the test section of the directional drilling, so that the first packer plug and the second packer plug are located at both ends of the test section;

[0020] Hydraulic transport and locking:

[0021] After connecting the guide connection device to the high-pressure hose, place it inside the wire drill rod. Connect it to the high-flow pressurization system through the high-flow interface of the drill rod sealing device, and pump in high-pressure water to push the guide connection device to move along the inside of the wire drill rod.

[0022] The guide connection device moves to the docking piston, and its locking buckle is opened by the piston cone. When it moves to the piston locking step, it is locked by the return spring, forming a rubber plug pressure channel from the high pressure hose, the piston center through hole, the center channel to the inner cavity of the first and second sealing rubber plugs.

[0023] In-hole test:

[0024] A high-pressure hose is connected to the low-flow pressurization system outside the hole through the central through hole of the drill pipe sealing device. The pumped pressure causes the first and second sealing plugs to expand and seal the test hole section.

[0025] The high-flow pressurization system is connected through the side through hole of the drill pipe sealing device. High-pressure water is pumped into the test hole section through the inner cavity of the wire rope drill pipe and the side water inlet channel to conduct the in-hole hydraulic test.

[0026] Unlocking and Recycling:

[0027] After the test is completed, remove the drill pipe sealing device, insert the pipeline unlocking device into the high-pressure hose and place it inside the wireline drill pipe, reinstall the drill pipe sealing device and connect it to the high-flow pressurization system;

[0028] When the hydraulic push pipeline unlocking device reaches the guide connection device, its unlocking chamber squeezes the unlocking plate of the locking buckle, causing the locking buckle to disengage from the piston locking step and release the lock.

[0029] Device Removal: The high-pressure hose is pulled by an external winch to retrieve the guide connection device, pipeline unlocking device and high-pressure hose in sequence. The rope drill rod and test packer system are then removed with the help of a drilling rig.

[0030] Furthermore, after the rubber plug pressure channel is formed in step 2, the high-pressure hose is sealed by the internal center joint of the drill pipe sealing device, and the external pressure system is connected to the hole through the external center joint to isolate the test section pressure channel from the rubber plug pressure channel.

[0031] Furthermore, in step 4, the hose center guide wheel of the pipeline unlocking device elastically clamps the high-pressure hose to ensure precise docking between the unlocking chamber and the unlocking pressure plate.

[0032] This invention achieves low-cost and high-efficiency dual-pipeline hydraulic testing by optimizing the testing procedures and equipment combination. It has the following advantages: (1) During the drilling process of the double-pipeline hydraulic test of the wireline drill rod, it is not necessary to run the drill rod while inserting the hose, which can effectively reduce the drilling time. (2) The hydraulic conveying pipeline docking technology can realize the rapid connection of the pressure channel of the sealing plug. (3) After the borehole hydraulic test is completed, the hydraulic conveying pipeline release technology can quickly unlock the pipeline and realize the rapid recovery of the high-pressure pipeline inside the drill rod. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall assembly longitudinal section structure of the borehole hydraulic test device system of the present invention;

[0034] Figure 2(a) is a longitudinal cross-sectional view of the drill pipe plugging device of the present invention; (b) is a longitudinal cross-sectional view of the pipeline unlocking device of the present invention; (c) is a longitudinal cross-sectional view of the pipeline guiding and connecting device of the present invention; (d) is a longitudinal cross-sectional view of the connection and channel distribution of the docking piston and channel separation device of the present invention.

[0035] Figure 3 (a) is a schematic diagram of the first longitudinal cross-sectional structure after the guiding connection device of the present invention is connected to the docking piston; (b) is a schematic diagram of the first longitudinal cross-sectional structure when the unlocking device of the present invention is connected to the unlocked state of the guiding connection device; (c) is a schematic diagram of the second longitudinal cross-sectional structure when the unlocking device of the present invention is connected to the unlocked state of the guiding connection device.

[0036] Figure 4 (a) is a schematic diagram of the channel distribution cross-section A-A' of the channel separation device of the present invention; (b) is a schematic diagram of the cross-section B-B' of the locking end of the guide connection device and the docking piston when the present invention is in the unlocked state; (c) is a schematic diagram of the cross-section C-C' of the unlocking chamber and the unlocking pressure plate of the locking plate when the present invention is in the unlocked state; (d) is a schematic diagram of the cross-section D-D' of the hose concentrating guide wheel and the high-pressure hose when the present invention is in the unlocked state.

[0037] Figure 5 (a) is a schematic diagram of the working state of the packer of the present invention when it is pushed to the test depth;

[0038] (b) is a schematic diagram of the working state of the hydraulic conveying guide connection device of the present invention during the process; (c) is a schematic diagram of the working state of the present invention conducting in-hole hydraulic tests; (d) is a schematic diagram of the working state of the hydraulic conveying pipeline unlocking device of the present invention; (e) is a schematic diagram of the working state of the device after the pipeline is unlocked.

[0039] The reference numerals in the figure are described below:

[0040] 1—High-pressure hose; 2—High-flow hose; 3—Drill pipe plugging device;

[0041] 1-1 Tensile steel wire hose; 1-2 Pipe fitting;

[0042] 3-1 External center connector, 3-2 High flow interface, 3-3 Center through hole, 3-4 Lateral through hole, 3-5 Internal center connector, 3-6 Drill pipe interface;

[0043] 4—Wireline drill rod; 5—Pipeline unlocking device;

[0044] 5-1 Water collection tank, 5-2 Water collection port, 5-3 Support roller, 5-4 Hoses center guide wheel, 5-5 Elastic support rod, 5-6 Water-blocking circular plate, 5-7 Anti-slip tooth groove, 5-8 Unlocking chamber, 5-9 Trumpet-shaped opening;

[0045] 6—Guiding connection device;

[0046] 6-1 Water collection tank, 6-2 Water collection port, 6-3 Support roller, 6-4 Unlocking pressure plate, 6-5 Pressure plate anti-slip groove, 6-6 Center connecting rod, 6-7 Return spring, 6-8 Rotary shaft base, 6-9 Locking plate, 6-10 Sealing ring, 6-11 Docking chamber, 6-12 Locking buckle;

[0047] 7—Dating piston;

[0048] 7-1 Piston cone head, 7-2 Piston center through hole, 7-3 Piston locking step;

[0049] 8—Channel separation device;

[0050] 8-1 Side inlet channel, 8-2 Central channel, 8-3 Diversion channel, 8-4 Merging chamber;

[0051] 9—First sealing plug; 10—First center rod; 11—Test section connecting pipe;

[0052] 11-1 Water outlet hole for flower tube; 11-2 Rubber plug connection channel;

[0053] 12—Second sealing rubber plug; 13—Second center rod; 14—Rubber plug sealing component; 15—Drill hole. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Please see Figures 1-5 The present invention is applicable to one embodiment of a hydraulic conveying in-situ hydraulic testing device for directional drilling, including a high-pressure hose 1, a high-flow hose 2, a drill rod plugging device 3, a wireline drill rod 4, a pipeline unlocking device 5, a guide connection device 6, a docking piston 7, a channel separation device 8, and a test packer system (9~14).

[0056] The key innovation of this invention is a hydraulically conveying pressure channel access and release system composed of a channel separation device 8, a docking piston 7, a guiding connection device 6, a pipeline unlocking device 5, and a drill pipe sealing device 3. After the test packer system (9-14) is pushed to the test section with the maximum depth in the hole by the drill pipe, high-pressure and high-speed water is pumped in through the high-flow interface 3-2 of the drill pipe sealing device 3. Under the action of the high-pressure water flow, the guiding connection device 6 is pushed to pull the tail high-pressure hose 1 forward quickly in the drill pipe until it is connected and locked with the docking piston 7 to form an independent pressure channel. After passing through the channel separation device 8, it enters the packer rubber plug. The rubber plug expands under the increased water pressure to achieve the purpose of sealing the test hole section. After the hydraulic test in the hole is completed, the pipeline unlocking device 5 is pushed again by hydraulic conveying to release the central pipeline lock, so as to achieve the purpose of quickly removing the high-pressure hose 1 in the drill pipe.

[0057] The hydraulic transmission pressure channel access and release system includes a channel separation device 8, a docking piston 7, a guide connection device 6, a drill pipe sealing device 3, and a pipeline unlocking device 5.

[0058] The channel separation device 8, with one end connected to the rope drill rod 4 and the docking piston 7, and the other end connected to the test packer system (9~14), includes: multiple sets of built-in side inlet channels 8-1 converging in the merging chamber 8-4 (see...). Figure 2 (d) forms a test section pressure channel consisting of the inner cavity of the wireline drill rod 4, multiple sets of side water inlet channels 8-1, a confluence cavity 8-4, a through hole of the first central rod 10, a central through hole of the test section connecting perforated pipe 11, and a water outlet hole 11-1 of the perforated pipe; the built-in central channel 8-2 connects to multiple diversion channels 8-3 (see Figure 2 In the middle (d), a rubber plug pressure channel is formed, consisting of a central through hole 7-2 of the docking piston, a central channel 8-2, a diversion channel 8-3, a cavity between the first sealing rubber plug 9 and the first central rod 10, a rubber plug connecting channel 11-2, and a cavity between the second sealing rubber plug 12 and the second central rod 13.

[0059] The docking piston 7 includes a piston cone 7-1, a piston center through hole 7-2, and a piston locking step 7-3 (see...). Figure 2 (d) The piston cone 7-1 is cone-shaped to facilitate docking with the guide connection device 6. The tail of the docking piston 7 can extend into and be fixed in the central channel 8-2 of the channel separation device 8.

[0060] The guiding connection device 6 includes a water collection tank 6-1, a water collection port 6-2, a support roller 6-3, an unlocking pressure plate 6-4, an anti-slip tooth groove 6-5, a center connecting rod 6-6, a return spring 6-7, a rotating shaft base 6-8, a locking plate 6-9, a sealing ring 6-10, a docking chamber 6-11, and a locking buckle 6-12.

[0061] The diameter of the water collection chamber 6-1 is slightly smaller than the inner wall diameter of the wireline drill rod 4, and the water collection port 6-2 has an oblique opening, which can gather high-pressure water flow and generate a large thrust within its cavity. Support rollers 6-3 are distributed around the outer wall of the water collection chamber, and the support guide connection device 6 is centered and reduces resistance to achieve rapid movement. The water collection chamber 6-1 narrows in diameter in the middle section to transition to the docking end. The central connecting rod 6-6 can connect the high-pressure hose 1 and the docking end. The docking end includes the docking chamber 6-11, the sealing ring 6-10, and the locking fasteners on both sides of the docking chamber. The locking fasteners consist of two parts, with the locking plate 6-9 fixed to the pivot base 6-8. On both sides of the docking chamber 6-11, the unlocking pressure plate 6-4 at one end of the locking plate can extend into the water collection chamber 6-1 through a pre-set window at the bottom of the water collection chamber 6-1 and is supported by the return spring 6-7. Anti-slip grooves 6-5 are evenly distributed on the contact surface of the unlocking pressure plate 6-4. The locking buckle 6-12 at the other end of the locking plate gradually opens as it is squeezed by the docking piston cone 7-1. The unlocking pressure plate 6-4, in conjunction with the rotating shaft base 6-8, compresses the return spring 6-7. Upon reaching the piston locking step 7-3, the spring rebounds, completing the locking of the locking buckle 6-12 with the docking piston 7. (See...) Figure 2 (c) and Figure 3 (a)

[0062] The high-pressure hose 1 consists of several pressure hoses connected in series according to the maximum test depth. Each pressure hose is composed of a tensile steel wire hose 1-1 and a pipe fitting 1-2 (see...). Figure 2 (c) The pipe connector 1-2 is connected to the center connecting rod 6-6 of the guide connection device, which can connect the pressure channel of the rubber plug inside the hole with the external pressurization system. The packer rubber plug expands through the external pressurization via the high pressure hose 1.

[0063] The pipeline unlocking device 5 includes a water collection chamber 5-1, a water collection port 5-2, a support roller 5-3, a hose central guide wheel 5-4, an elastic support rod 5-5, a water-blocking circular plate 5-6, an anti-slip groove 5-7, an unlocking chamber 5-8, and a trumpet-shaped opening 5-9.

[0064] The diameter of the water-gathering chamber 5-1 is slightly smaller than the inner diameter of the wire rope drill rod 4, and the water-gathering port 5-2 has a slanted opening, which can gather high-pressure water flow and generate a large thrust within its cavity. Support rollers 5-3 are distributed around the outer wall of the water-gathering chamber, and the support pipeline unlocking device 5 is centered and reduces resistance to achieve rapid movement. To increase the water flow thrust, a water-blocking circular plate 5-6 is installed at the bottom of the water-gathering chamber, with a flared central hole to ensure smooth passage of the pressure pipe connector 1-2. The hose-gathering guide rollers 5-4 are symmetrically installed on the edge of the water-blocking circular plate 5-6 via elastic support rods 5-5. The symmetrical guide rollers, with their concave arc surfaces, clamp the high-pressure hose 1 and keep it centered. -2 When passing the guide wheel, the elastic support rod 5-5 can elastically adjust its displacement to ensure stable passage; the unlocking port is the unlocking chamber 5-8, with anti-slip grooves 5-7 evenly distributed on the inner wall, and a trumpet-shaped opening 5-9 at the end. When the water is pumped to the port of the guide connecting device 6, the trumpet-shaped opening 5-9 can easily fit into the unlocking pressure plate 6-4 and compress the return spring 6-7. Through the linkage of the rotating shaft base 6-8, the locking buckle 6-12 gradually opens. After the water pumping is completed, the anti-slip grooves 5-7 on the inner wall of the unlocking chamber and the anti-slip grooves 6-5 on the unlocking pressure plate are engaged and do not slip. At this time, the guide connecting device 6 and the docking piston 7 are unlocked. See Figure 3 (b) and Figure 3 (c)

[0065] The wireline drill pipe 4 is a drill pipe that is matched with the drilling platform. One end is connected to the channel separation device 8, and the other end is connected to the drill pipe sealing device 3, which can facilitate testing with the drilling rig.

[0066] The drill pipe plugging device 3 includes an external center connector 3-1, a high flow interface 3-2, a center through hole 3-3, a side through hole 3-4, an internal center connector 3-5, and a drill pipe interface 3-6.

[0067] External center connector 3-1 can be connected to a low-flow pressurization system; internal center connector 3-5 can be connected to high-pressure hose 1; high-flow interface 3-2 can be connected to a high-flow pressurization system via high-flow hose 2; drill pipe interface 3-6 connects to the borehole wire drill pipe 4 (see...). Figure 2 (a) When using the hydraulic conveying guide connection device 6 or the pipeline unlocking device 5, the external center connector 3-1 and the internal center connector 3-5 need to be removed in advance. At this time, the high-pressure hose 1 can freely pass through the central through hole 3-3. When conducting the in-hole hydraulic test, the external center connector 3-1 and the internal center connector 3-5 need to be installed in advance. The internal center connector 3-5 is connected to the high-pressure hose 1 to realize the connection between the low-flow pressurization system outside the hole and the packer cavity inside the hole. The pressure channel of the test section can be connected by connecting to the inner cavity of the rope drill rod 4 through the high-flow interface 3-2 and the lateral through hole 3-4.

[0068] When using this invention to conduct hydraulic transport tests applicable to directional drilling, the specific steps include the following:

[0069] The first step is to assemble the in-hole testing device system (7~14), and push it to the selected deepest test section via the connecting rope drill rod 4. At this time, the working state is as follows: Figure 5 As shown in (a);

[0070] The second step involves calculating the required number of pressure hoses based on the test depth and connecting them in series to form a high-pressure hose channel. Disconnect the center connectors 3-1 and 3-5 at both ends of the drill pipe sealing device 3, ensuring the center through-hole 3-3 of the drill pipe sealing device 3 remains unobstructed. Pass one end of the series-connected high-pressure hose 1 through the center through-hole 3-3 and connect it to the center connecting rod 6-6 of the guide connecting device 6. Insert the guide connecting device 6 into the wireline drill pipe 4 and install the drill pipe sealing device 3. Connect the high-flow pressurization system to the interface 3-2 of the drill pipe sealing device 3 via the high-flow hose 2. The operating state at this time is as follows: Figure 5 (b)

[0071] The third step involves the high-flow pressurization system pumping high-pressure, high-speed water into the drill rod. The high-speed water enters cavity 6-1, pushing and guiding the high-pressure hose 1 forward. Support rollers 6-3 ensure the guide connection device 6 moves quickly inside the drill rod and maintains end alignment. The pushing speed can be controlled by adjusting the pumped water flow rate. At this time, the water at the front end of the guide connection device 6 inside the rope drill rod 4 is squeezed and pushed in, following the pressure channel path of the test section of the test system. It enters the borehole from the outlet 11-1 of the connecting pipe 11 in the test section and then exits back out of the borehole. The working state at this time is as follows: Figure 5 As shown in (b);

[0072] In the fourth step, when the docking chamber 6-11 at the end of the guide connecting device 6 is connected to the docking piston 7, the piston cone 7-1, being inclined, can smoothly push open the locking buckle 6-12 of the guide connecting device 6 and enter the docking chamber 6-11. It then passes through the sealing ring 6-10 until the locking buckle 6-12 springs back at the piston locking step 7-3 to lock the guide connecting device 6 and the docking piston 7. Finally, a channel is formed through the high-pressure hose 1, the through hole of the central connecting rod 6-6, the docking chamber 6-11, the piston central through hole 7-2, the internal central channel 8-2, and the diversion channel 8-3 into the inner cavity of the expansion plug of the test device system. This is the pressure channel of the test system plug, and its working state is as follows: Figure 3 As shown in (a);

[0073] Fifth step, remove the drill pipe plugging device 3, install center connectors 3-1 and 3-3 at both ends of it, connect the internal center connector 3-3 to the high-pressure hose 1 inside the drill pipe, and then install the drill pipe plugging device 3 back to the end of the rope drill pipe 4. Connect the external center connector 3-1 to the low-flow high-pressure pressurization system outside the hole through the ground pressure hose, and connect the pipe interface 3-2 to the high-flow pressurization system outside the hole through the high-flow hose 2. At this time, the entire test system is ready.

[0074] Step 6: Conduct the borehole hydraulic test. First, start the low-flow pressurization system. Pressurized water enters the inner cavity of the first packer (the space between the first packer plug 9 and the first central rod 10) through the central channel of the drill pipe sealing device 3 and the pressure channel of the rubber plug inside the drill pipe, and then enters the inner cavity of the second packer (the space between the second packer plug 12 and the second central rod 13) through the plug connecting channel 11-2. After pressurizing to the test set pressure, the first packer plug 9 and the second packer plug 12 expand and tightly adhere to the borehole wall, achieving a seal and isolation of the intermediate test borehole section. Then, start the high-flow pressurization system and adjust the appropriate flow rate. At this time, the high-pressure water flow can enter the borehole test section through the lateral through-hole 3-4 of the drill pipe sealing device 3 along the test section pressure channel to conduct the corresponding hydraulic test. The working state at this time is as follows: Figure 5 As shown in (c);

[0075] Step 7: After the first hydraulic test is completed, remove the drill pipe sealing device 3. If it is necessary to continue testing other test sections, remove the drill pipe to the next test position and remove the pressure hose of the corresponding length inside the drill pipe at the same time. Repeat steps 5 and 6 to complete the next test section test.

[0076] Step 8: After the hydraulic tests of all sections within the selected range are completed, remove the drill rod sealing device 3 and its two end center connectors 3-1 and 3-3. Insert the pipeline unlocking device 5 through the orifice end of the high-pressure hose 1 and into the rope drill rod 4. Then, pass the orifice end of the high-pressure hose 1 through the center through hole 3-3. Reinstall the drill rod sealing device 3. Connect the pressurization system to the drill rod sealing device 3 interface 3-2 again through the high-flow hose 2. Tighten the high-pressure hose 1 outside the hole to keep it taut inside the drill rod. Start the pressurization system; the high-speed water flow will enter the cavity 5-1 and push the pipeline unlocking device 5 along the high-pressure hose 1. The support roller 5-3 ensures that the pipeline unlocking device 5 moves quickly inside the drill rod and keeps its end aligned. The hose centering guide wheel 5-4 ensures that the high-pressure hose 1 is centered and reduces sliding friction, thus allowing the pipeline unlocking device 5 to smoothly pass through the drill rod 4 along the high-pressure hose 1. The working state at this time is as follows: Figure 1 and Figure 5 As shown in (d);

[0077] Step 9: As high-pressure water is continuously injected, the trumpet-shaped opening 5-9 at the front end of the pipeline unlocking device 5 unlocks the locking clamp 6-4 of the guide connection device 6. Under the pressure of the water flow at the end, the unlocking chamber 5-8 gradually compresses the return spring 6-7, causing the locking buckle 6-12 to open and disengage from the piston locking step 7-3. At this time, the tightness of the high-pressure hose 1 outside the hole will be released. Then, the drill rod sealing device 3 is removed, and the high-pressure hose 1 inside the drill rod can be quickly pulled out by a winch, along with the front pipeline unlocking device 5 and the guide connection device 6. The working state at this time is as follows: Figure 5 As shown in (e);

[0078] Step 10: Remove drill rods 4 from the hole one by one with the help of a drilling rig, and finally take out the test packer system (9~14) from the hole.

[0079] This invention, through hydraulic conveying for guiding connection and unlocking, dual-channel independent control, and integrated enclosure design, has the following characteristics and effects:

[0080] 1. Significantly improves construction efficiency

[0081] The hydraulic conveying and guiding connection device enables automatic docking and locking of the high-pressure hose and the in-hole packer system, eliminating the traditional hose threading process when connecting each drill rod and reducing drilling time. The pipeline unlocking device quickly unlocks the hose via hydraulic conveying, and after testing, all high-pressure hoses can be recovered at once, avoiding the tedious operation of disassembling each section.

[0082] 2. Reduce operational risks

[0083] The channel separation device independently separates the test section pressure channel (inner cavity of the wire rope drill rod) from the rubber plug pressure channel (central channel), avoiding the risk of blockage in the borehole caused by cross-interference of traditional externally bound dual pipelines; the high-pressure hose is built-in throughout, and the rigid connection design of the borehole test equipment and the wire rope drill rod with the same diameter ensures that the outer diameter of the entire borehole test system is consistent and has a small gap with the borehole wall, which can effectively reduce the risk of stuck drill and falling blocks during hydraulic testing under small inclination angle / near horizontal working conditions of directional drilling.

[0084] 3. Enhanced ease of operation and adaptability

[0085] The guide connection device features a support roller and a slanted opening design for the water collection chamber, ensuring central stability during hydraulic transport and adapting to the curved trajectory of directional drilling in complex formations. The test packer system achieves synchronous expansion and sealing through a rubber plug pressure channel, resulting in high isolation accuracy of the test section and meeting the needs of various in-situ tests such as water pressure tests and geostress tests.

[0086] This invention can greatly save time, reduce drilling risks, and thus generate significant economic benefits. It can also improve the efficiency of drilling tests, reduce testing costs, and the method is simple to operate, requires low equipment, and is easy to promote and apply on a large scale.

[0087] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hydraulic conveying in-situ testing device for directional drilling, characterized in that, Includes high-pressure hose (1), high-flow hose (2), drill pipe plugging device (3), wireline drill pipe (4), pipeline unlocking device (5), guide connection device (6), docking piston (7), channel separation device (8) and test packer system (9~14). One end of the channel separation device (8) is connected to the rope drill rod (4), and the other end is connected to the test packer system (9~14). The channel separation device (8) has a built-in side water inlet channel (8-1) and a central channel (8-2). The side water inlet channel (8-1) forms a test section pressure channel, and the central channel (8-2) forms a rubber plug pressure channel. The tail of the docking piston (7) is fixed in the central channel (8-2) of the channel separation device (8), and its head is provided with a piston cone (7-1) and the middle is provided with a piston locking step (7-3). The guiding connection device (6) is configured to move within the rope drill rod (4) via hydraulic transmission. Its front end is provided with a locking buckle (6-12), which can be locked with the piston locking step (7-3) to close the rubber plug pressure channel. One end of the high-pressure hose (1) is connected to the center connecting rod (6-6) of the guiding connection device (6), and the other end extends to the outside of the hole and is connected to the pressurization system; The pipeline unlocking device (5) is configured to be hydraulically delivered to the guiding connection device (6), and its front end is provided with an unlocking chamber (5-8) for releasing the locking buckle (6-12) from the piston locking step (7-3); The drill pipe sealing device (3) is set at the orifice end of the wire rope drill pipe (4), and it is provided with a central through hole (3-3) and a side through hole (3-4). The central through hole (3-3) is used to pass through the high pressure hose (1), and the side through hole (3-4) is used to pass through the pressure channel of the connecting test section. The test packer system (9-14) receives pressure through the rubber stopper pressure channel and then expands to seal the test hole section; The high-flow interface (3-2) of the drill pipe sealing device (3) is connected to the high-flow pressurization system. The high-pressure water flow is pumped in to push the guide connection device (6) to move along the inside of the rope drill pipe (4). The water at the front end of the guide connection device (6) will be squeezed and pushed in. It will enter the borehole from the outlet hole (11-1) of the test section connecting pipe (11) along the pressure channel path of the test section of the test system and then return to the borehole. The high-pressure hose (1) is connected to the low-flow pressurization system outside the hole through the central through hole (3-3) of the drill pipe plugging device (3). The pumped pressure causes the first sealing plug (9) and the second sealing plug (12) to expand and seal the test hole section. The high-flow pressurization system is connected through the side through hole (3-4) of the drill pipe plugging device (3), and high-pressure water is pumped into the test hole section through the inner cavity of the wire rope drill pipe (4) and the side water inlet channel (8-1) to conduct the in-hole hydraulic test; The test packer system (9~14) includes a first packer plug (9), a first center rod (10), a test section connecting tube (11), a second packer plug (12), a second center rod (13), and a plug sealing component (14). The side water inlet channel (8-1) of the channel separation device (8) is connected to the inner cavity of the rope drill rod (4), forming a test section pressure channel from the inner cavity of the rope drill rod (4), the side water inlet channel (8-1), the water outlet hole (11-1) of the test section connecting flower pipe (11) to the test hole section; the central channel (8-2) is connected to the piston central through hole (7-2) of the docking piston (7), forming a rubber plug pressure channel from the high pressure hose (1), the central connecting rod (6-6), the piston central through hole (7-2), the central channel (8-2), the diversion channel (8-3) to the inner cavity of the first sealing rubber plug (9) and the second sealing rubber plug (12).

2. The apparatus according to claim 1, characterized in that, The guiding connection device (6) further includes a water collection tank (6-1), a support roller (6-3), and a docking chamber (6-11). The water collection port (6-2) of the water collection tank (6-1) is obliquely cut. The support roller (6-3) is distributed on the outer wall of the water collection tank (6-1). The docking chamber (6-11) can be fitted into the docking piston (7) to form a pressure channel. The locking buckle (6-12) extends into the water collection tank (6-1) through the locking plate (6-9) and the unlocking pressure plate (6-4) and is elastically connected to the water collection tank (6-1) through the return spring (6-7).

3. The apparatus according to claim 1, characterized in that, The pipeline unlocking device (5) also includes a hose centering guide wheel (5-4), which is symmetrically installed by an elastic support rod (5-5) to clamp the high-pressure hose (1) and keep it centered.

4. A hydraulic conveying in-situ testing method for directional drilling, characterized in that, The method, performed using the apparatus described in any one of claims 1-3, comprises the following steps: Assembly and Push: Connect the test packer system (9~14), channel separation device (8), docking piston (7) and wire drill rod (4) in sequence, and push them to the test hole section of the directional drilling, so that the first packer plug (9) and the second packer plug (12) are located at both ends of the hole section to be tested; Hydraulic transport and locking: After connecting the guide connection device (6) to the high pressure hose (1), place it inside the rope drill rod (4), and connect it to the high flow pressurization system through the high flow interface (3-2) of the drill rod sealing device (3). Pump in high pressure water flow to push the guide connection device (6) to move along the inside of the rope drill rod (4); The guide connection device (6) moves to the docking piston (7), and its locking buckle (6-12) is squeezed open by the piston cone (7-1). When it moves to the piston locking step (7-3), it is locked by the return spring (6-7), forming a rubber plug pressure channel from the high pressure hose (1), the piston center through hole (7-2), the center channel (8-2) to the inner cavity of the first sealing rubber plug (9) and the second sealing rubber plug (12); In-hole test: The high-pressure hose (1) is connected to the low-flow pressurization system outside the hole through the central through hole (3-3) of the drill pipe plugging device (3). The pumped pressure causes the first sealing plug (9) and the second sealing plug (12) to expand and seal the test hole section. The high-flow pressurization system is connected through the side through hole (3-4) of the drill pipe plugging device (3), and high-pressure water is pumped into the test hole section through the inner cavity of the wire rope drill pipe (4) and the side water inlet channel (8-1) to conduct the in-hole hydraulic test; Unlocking and Recycling: After the test is completed, remove the drill pipe sealing device (3), put the pipeline unlocking device (5) into the high pressure hose (1) and place it inside the rope drill pipe (4), reinstall the drill pipe sealing device (3) and connect it to the high flow pressurization system; When the hydraulic push pipeline unlocking device (5) reaches the guide connection device (6), its unlocking chamber (5-8) squeezes the unlocking pressure plate (6-4) of the locking buckle (6-12), causing the locking buckle (6-12) to disengage from the piston locking step (7-3) and release the lock; Device removal: Pull the high-pressure hose (1) with the external hoisting equipment, and retrieve the guide connection device (6), pipeline unlocking device (5) and high-pressure hose (1) in sequence. Remove the rope drill rod (4) and test packer system (9~14) with the help of the drilling rig.

5. The method according to claim 4, characterized in that, After the rubber plug pressure channel is formed in step 2, the high pressure hose (1) is sealed by the internal center joint (3-5) of the drill rod sealing device (3), and the external pressure system is connected to the hole through the external center joint (3-1) to isolate the test section pressure channel from the rubber plug pressure channel.

6. The method according to claim 4, characterized in that, In step 4, the hose center guide wheel (5-4) of the pipeline unlocking device (5) clamps the high-pressure hose (1) to ensure that the unlocking chamber (5-8) and the unlocking pressure plate (6-4) are precisely connected.

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