A dual acting hydraulic drop shot fishing system

Abstract

The application discloses a double-acting hydraulic delivery fishing system, which comprises an orifice circulating system, a drill tool outer assembly, a drill tool inner assembly, an orifice fishing device and the like, a gear and rack unblocking mechanism cooperates with a double-acting hydraulic intelligent valve, through a gear and rack transmission mechanism, axial movement of the double-acting valve can realize on-off of a built-in liquid flow channel of the inner pipe assembly, radial movement of the locking unblocking mechanism can realize radial contraction and opening of a spring card, and then positioning of the drill tool inner assembly is realized. Through control of the orifice circulating system, liquid flow in the hole can realize two forms of positive circulation movement and reverse circulation movement, and the liquid flow in different circulation forms can realize delivery operation, coring drilling operation and fishing recovery operation of the drill tool inner assembly. In the delivery and fishing stage, the double-acting booster piston can accelerate the movement speed of the drill tool inner assembly to a certain extent, and further improve the delivery and fishing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling coring, in particular to a double-acting hydraulic delivery and fishing system. BACKGROUND

[0002] Wireline coring is the most widely used coring method in current geological drilling. After the end of the return trip, the wireline fishing device is delivered from the drill string by the coring winch, hooks the drill tool assembly spearhead, and then the inner assembly and the core are fished to the ground. In horizontal or high-angle hole drilling, the running of the coring tool is a difficult and time-consuming operation process. In deep or ultra-deep hole drilling, the running of the coring tool is also a time-consuming process due to various unknown factors in the hole. The existing wireline coring tool and method also have the problem that the inner tube assembly positioning signaling mechanism and the core full tube or blockage alarm mechanism are unreliable. Therefore, it is a key problem to be solved to realize the delivery and fishing of the drill tool inner assembly by hydraulic action.

[0003] The existing hydraulic delivery and fishing system at home and abroad is mostly used in horizontal directional coring drilling process. The main working principle is to realize the delivery and fishing of the drill tool inner assembly by a designed drill tool inner assembly conveyor and fisher. Under the action of hydraulic force, the drill tool conveyor delivers the drill tool inner assembly to the hole. After the core is full, the delivery and fishing device and the steel wire rope connected with the fishing device are put in. The steel wire rope is freely released on the winch, hooks the spearhead, and then the winch is operated to pull out the fishing device and the drill tool inner assembly out of the hole. Since the steel wire rope needs to move freely and be relatively sealed to generate conveying pressure at the wire feeding device of the fisher, the wire feeding device often causes a large pressure drop, resulting in a decrease in delivery efficiency. SUMMARY

[0004] The purpose of the present application is to provide a double-acting hydraulic delivery and fishing system to solve the problems existing in the prior art. Under the action of hydraulic positive and reverse circulation, the drill tool inner assembly can be quickly delivered and fished without other conveyors or fishers, simplifying the delivery and fishing equipment and operation process, and improving the delivery and fishing efficiency.

[0005] To achieve the above purpose, the present application provides the following scheme: the present application provides a double-acting hydraulic delivery and fishing system, which comprises

[0006] An orifice circulation system, which comprises a mud pump, a circulation pipeline, a mud pool, a four-way ball valve one, a four-way ball valve two, a circulation pipeline one, a circulation pipeline two, a circulation pipeline three, a backwater joint and an annular joint; a hydraulic positive circulation process is that the liquid flow pumped by the mud pump enters the circulation pipeline through the four-way ball valve one, then flows through the central through hole of the active drill pipe, the wireline drill pipe column and the drill tool outer assembly to the hole bottom, the hole bottom liquid flow returns to the annular joint along the annular gap between the drill tool outer assembly, the wireline drill pipe column and the active drill pipe and the borehole, and finally returns to the mud pool through the circulation pipeline three and the four-way ball valve two; a hydraulic reverse circulation process is that the four-way ball valve one and the four-way ball valve two are respectively rotated by 90 degrees on the basis of the hydraulic positive circulation process, the liquid flow pumped by the mud pump enters the annular joint through the four-way ball valve one, the circulation pipeline two, the four-way ball valve two and the circulation pipeline three, then reaches the hole bottom through the annular gap between the wireline drill pipe column and the drill tool outer assembly and the borehole, the hole bottom liquid flow returns to the backwater joint along the central through hole of the drill tool outer assembly and the wireline drill pipe column, and finally returns to the mud pool through the circulation pipeline, the four-way ball valve one, the circulation pipeline one and the four-way ball valve two; and

[0007] An active drill pipe, which transmits the drilling pressure torque of the surface drilling rig to the drill tool outer assembly at the hole bottom through the wireline drill pipe column; and

[0008] A drill tool inner assembly, which is built in the central hole of the wireline drill pipe column, is hung on the drill tool outer assembly and can move along the wireline drill pipe column; and

[0009] A drill tool outer assembly, which can be separated from the drill tool outer assembly and move to the ground orifice when the drill tool inner assembly is affected by the reverse circulation hydraulic force at the hole bottom; and

[0010] An orifice fishing device, which holds the drill tool inner assembly when the drill tool inner assembly moves to the orifice fishing device, so as to realize the fishing operation.

[0011] Preferably, a liquid flow channel is built in the drill tool inner assembly, the liquid flow direction of the liquid flow channel is that the liquid flow enters the upper central hole of the drill tool inner assembly through the water inlet hole, opens the ball valve under the hydraulic action, flows into the lower central hole of the drill tool inner assembly, finally flows out of the central hole of the drill tool inner assembly through the water outlet hole and enters the annular gap between the drill tool inner assembly and the drill tool outer assembly until the drill bit at the hole bottom; the liquid flow channel is one-way normally closed, can be conducted in the hydraulic positive circulation process, and is closed in the hydraulic reverse circulation process.

[0012] Preferably, the suspension ring seat of the inner drilling assembly is hung on the seat ring of the outer drilling assembly, and the hydraulic positive circulation is started, the flow channel is closed when the hole bottom liquid flow pressure is less than the set value, and the flow channel is gradually opened when the hole bottom liquid flow pressure is greater than the set value.

[0013] Preferably, the inner drilling assembly is provided with a spear mechanism, the spear mechanism comprises a spear head, a spear seat, a positioning pin, a positioning spring and an elastic cylindrical pin, the spear head is connected with the spear seat through the elastic cylindrical pin, the positioning pin can fix the spear head under the action of the positioning spring, when the inner drilling assembly reaches the orifice fishing device, the fishing hook of the orifice fishing device grabs the spear head so as to lift the inner drilling assembly.

[0014] Preferably, the inner drilling assembly is provided with a gear and rack locking and releasing mechanism, the gear and rack locking and releasing mechanism comprises a rack arranged on a center rod, a gear, a clamping plate, a compression spring and a clamping chamber, when no external force is applied, the clamping plate is in a contraction state under the pre-tightening force of the compression spring, when the inner drilling assembly is not in place, the clamping plate is also in the contraction state due to the space limitation of the rope and the inner wall of the drill rod column, at this time, the ball valve on the center rod is in contact with the rubber sealing sleeve, and the built-in flow channel of the inner drilling assembly is in a normally closed state; when the orifice circulation system starts the hydraulic positive circulation, and the suspension ring seat of the inner drilling assembly is hung on the seat ring of the outer drilling assembly, at this time, the clamping plate reaches the clamping chamber and has a radial opening space condition, when the liquid flow pressure reaches the set value, the liquid flow pushes the ball valve and drives the center rod to move axially towards the hole bottom, and the clamping plate is driven to open radially into the clamping chamber for positioning through the gear and rack transmission mechanism.

[0015] The present application has the following beneficial technical effects compared with the prior art:

[0016] The double-acting hydraulic delivery fishing system in the application comprises an orifice circulation system, a drill tool outer assembly, a drill tool inner assembly and an orifice fishing device, etc., and the application innovatively designs a gear and rack locking and releasing mechanism, a double-acting hydraulic intelligent valve, a double-acting booster piston and other structures on the drill tool inner assembly. The gear and rack releasing mechanism cooperates with the double-acting hydraulic intelligent valve, and through a gear and rack transmission mechanism, the axial movement of the double-acting valve can be converted into the radial movement of the locking and releasing mechanism. The axial movement of the double-acting valve can realize the opening and closing of the built-in liquid flow channel of the inner pipe assembly, and the radial movement of the locking and releasing mechanism can realize the radial contraction and expansion of the elastic clamping plate, thereby realizing the positioning of the drill tool inner assembly. Through the control of the orifice circulation system, the liquid flow in the hole can realize two forms of positive circulation movement and reverse circulation movement. The liquid flow in different circulation forms can realize the delivery operation, coring drilling operation and fishing recovery operation of the drill tool inner assembly. In the delivery and fishing stage, the double-acting booster piston can accelerate the movement speed of the drill tool inner assembly to a certain extent, further improve the delivery and fishing efficiency, and in addition, through the change and monitoring of the ground liquid flow pressure, the accurate reporting of the drill tool inner assembly in place and the alarm of the full pipe blockage of the core can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0018] Figure 1 is a schematic diagram of the liquid force positive circulation system of the drill tool inner assembly in the delivery or coring operation stage;

[0019] Figure 2 is a schematic diagram of the liquid force reverse circulation system of the drill tool inner assembly in the fishing recovery operation stage;

[0020] Figure 3 is a working principle diagram of the four-way ball valve;

[0021] Figure 4 is a schematic diagram of the structure of the drill tool inner assembly;

[0022] Figure 5 is a schematic diagram of the structure of the drill tool outer assembly;

[0023] Figure 6 is a schematic diagram of the structure of the orifice fishing device;

[0024] Figure 7 is a schematic diagram of the delivery operation of the drill tool inner assembly;

[0025] Figure 8The schematic diagram of the coring drilling operation of the inner assembly of the drilling tool;

[0026] Figure 9 The schematic diagram of the fishing and recovery operation of the inner assembly of the drilling tool.

[0027] In the figure: 1- the orifice circulation system, 2- the active drill pipe, 3- the rope drill pipe column, 4- the inner assembly of the drilling tool, 5- the outer assembly of the drilling tool, 6- the orifice fishing device, 7- the core, 8- the borehole;

[0028] Among them, the structure of the orifice circulation system 1: 101- the circulation pipeline, 107- the circulation pipeline one, 108- the circulation pipeline two, 109- the circulation pipeline three, 102- the four-way ball valve one, 103- the mud pool, 104- the mud pump, 105- the annular joint, 106- the four-way ball valve two;

[0029] The structure of the inner assembly of the drilling tool 4: 401- the fishing spear head, 402- the fishing spear seat, 403- the positioning pin, 404- the positioning spring, 405- the elastic cylindrical pin, 406- the upper water joint, 4061- the upper water hole, 407- the valve seat, 408- the rubber sealing sleeve, 409- the double-acting booster piston, 410- the center rod, 4101- the ball valve, 4102- the rack, 4103- the rod body, 4104- the centralizer rod, 411- the gear, 412- the elastic clamping plate, 413- the compression spring, 414- the elastic clamping frame, 415- the suspension ring, 416- the mandrel, 4161- the lower water hole, 4162- the mandrel center hole, 417- the reset spring, 418- the sliding sleeve, 419- the sliding sleeve seat, 420- the thrust ball bearing (conical roller bearing when the hole is horizontal), 421- the bearing seat, 422- the thrust ball bearing (conical roller bearing when the hole is horizontal), 423- the buffer spring, 424- the locking nut, 425- the return water joint, 4251- the water hole, 426- the one-way ball valve, 427- the adjusting nut, 428- the inner tube joint, 4281- the return water hole, 429- the core tube, 430- the snap spring seat, 431- the snap spring retainer, 432- the snap spring;

[0030] The structure of the outer assembly of the drilling tool 5: 501- the conversion joint, 502- the elastic clamping chamber, 503- the seat ring, 504- the upper reamer, 505- the outer tube, 506- the centralizer ring, 507- the lower reamer, 508- the coring bit;

[0031] The structure of the orifice fishing device 6: 601- the return water joint, 602- the fisher, 6021- the U-shaped ring, 6022- the seat hanger, 6023- the compression spring, 6024- the locking sleeve, 6025- the fishing hook spring, 6026- the cylindrical pin, 6027- the elastic pin, 6028- the fishing hook, 6029- the fishing hook frame, 603- the fisher seat. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] The present application aims to provide a double-acting hydraulic delivery fishing system to solve the problems in the prior art. The double-acting hydraulic delivery fishing system can realize fast delivery and fishing of the assembly in the drilling tool under the action of hydraulic positive and reverse circulation without other conveyors or fishers, simplifies the delivery and fishing equipment and operation process, and improves the delivery and fishing efficiency.

[0034] In order to make the above-mentioned purposes, characteristics and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] As shown in Figures 1-9 , the present application provides a double-acting hydraulic delivery fishing system, which comprises a borehole circulation system 1, a main drill rod 2, a rope drill rod column 3, an assembly in the drilling tool 4, an assembly outside the drilling tool 5, and a borehole fishing device 6. The main drill rod 2 transmits the drilling pressure and torque of the surface drilling machine to the assembly outside the drilling tool 5 at the bottom of the borehole through the rope drill rod column 3. The assembly in the drilling tool 4 is arranged in the central hole of the rope drill rod column 3 and can move along the rope drill rod column 3 and be seated on the assembly outside the drilling tool 5. When the assembly in the drilling tool 4 at the bottom of the borehole is subjected to the action of the reverse circulation fluid force at the bottom of the borehole, the assembly in the drilling tool 4 can be separated from the assembly outside the drilling tool 5 and move to the borehole. The backwater is discharged through the backwater joint of the fishing device 6 and the borehole circulation system 1. When the assembly in the drilling tool 4 moves to the borehole fishing device 6, the fishing device 6 grabs the assembly in the drilling tool 4 to realize the fishing operation. The present application replaces the process of fishing the assembly in the drilling tool by the special rope coring winch in the existing rope coring method, simplifies the operation process, and improves the efficiency of fishing the assembly in the drilling tool 4.

[0036] Figure 1 The figure shows the schematic diagram of the positive circulation movement of the fluid flow. The fluid is generally mud. The fluid flow pumped out by the mud pump 104 enters the circulation pipeline 101 through the four-way ball valve one 102 (the ball valve control state), then flows through the central through hole of the main drill rod 2, the rope drill rod column 3 and the assembly outside the drilling tool 5 to the bottom of the borehole. The fluid flow at the bottom of the borehole returns to the annular joint 105 along the annular space between the assembly outside the drilling tool 5, the rope drill rod column 3 and the main drill rod 2 and the borehole 8, and finally returns to the mud pit 103 through the circulation pipeline three 109 and the four-way ball valve two 106 (the ball valve control state). Thus, the positive circulation movement of the fluid flow is realized. Figure 1 Figure 1

[0037] Figure 2 ​​The fluid is generally mud, and the flow pumped by the mud pump 104 passes through the four-way ball valve one 102, the circulation pipeline two 108, the four-way ball valve two 106 (on the basis of positive circulation, the four-way ball valves one and two are rotated by 90 degrees respectively), and the circulation pipeline three 109 into the annular joint 105, and then reaches the bottom of the hole through the annular gap between the rope drill pipe column 3 and the drilling tool outer assembly 5 and the drilling hole 8. The flow at the bottom of the hole returns to the water return joint 610 along the central hole of the drilling tool outer assembly 5 and the rope drill pipe column 3, and finally returns to the mud tank 103 through the circulation pipeline 101, the four-way ball valve one 102, the circulation pipeline one 107, and the four-way ball valve two 106, thus realizing the hydraulic reverse circulation movement process.

[0038] Figure 3 The four-way ball valve is mainly composed of a valve cover 1021, a valve body 1022, and a valve core 1023, and can realize switching of positive and reverse water supply. The valve core 1023 is switched once every 90 degrees of rotation, and can be manually, pneumatically, or electrically operated according to requirements, which is convenient.

[0039] Figures 7-9 In the drilling tool inner assembly 4, a flow channel is arranged, that is, the flow enters the upper central hole of the drilling tool inner assembly 4 through the water inlet hole 4061, opens the ball valve 4101 under the action of a certain liquid force, flows into the lower central hole of the drilling tool inner assembly 4, and finally flows out of the central hole of the drilling tool inner assembly 4 through the water outlet hole 4161 and enters the annular gap between the drilling tool inner assembly 4 and the drilling tool outer assembly 5 until the bottom of the hole. The channel is one-way and normally closed, can be conducted under certain conditions under the action of positive circulation, and is closed under the action of reverse circulation. After the suspension ring 415 of the drilling tool inner assembly 4 is hung on the seat ring 503 of the drilling tool outer assembly 5, the hydraulic positive circulation is started, the flow channel is closed when the flow pressure at the bottom of the hole is less than a certain set value, and the channel is gradually opened when the flow pressure at the bottom of the hole is greater than a certain set value. Through the hydraulic positive circulation movement, the drilling tool inner assembly 4 can be quickly delivered and hung on the drilling tool outer assembly 5, and whether the drilling tool inner assembly 4 is in place can be judged through the change of the flow pressure in the hole. When the hole circulating system 1 starts the hydraulic reverse circulation, the central rod 410 moves towards the hole under the action of the liquid force and the compression spring 413, the ball valve 4101 contacts and gradually compresses the rubber sealing sleeve 408, and the built-in flow channel is closed, which provides conditions for the fishing and recovery operation of the drilling tool inner assembly 4.

[0040] Figure 4In the middle, the drill assembly 4 is provided with a spear mechanism, which is composed of a spear head 401, a spear seat 402, a positioning pin 403, a positioning spring 404 and an elastic cylindrical pin 405. The spear head 401 and the spear seat 402 are connected by the elastic cylindrical pin 405, which is convenient for disassembly and maintenance. The positioning pin 403 can fix the spear head 401 under the action of the positioning spring 404. When the drill assembly reaches the orifice fishing device 6, the fishing hook 608 grabs the spear head 401, so as to lift the drill assembly 4 up.

[0041] Figure 4 In the middle, the drill assembly 4 is provided with a double-acting booster piston 409. Under the action of the liquid flow, the V-shaped sealing structure will expand, thereby reducing the annular gap with the inner wall of the rope drill pipe column 3. When the liquid flow is positively and reversely circulated, the booster function is played, which can speed up the operation of the drill assembly 4 and further improve the delivery and fishing efficiency of the drill assembly 4.

[0042] Figure 4 and Figure 5In the drill string assembly 4, a rack and pinion locking and unblocking mechanism is arranged, which mainly consists of a rack 4102 on the center rod 410, a gear 411, a clamping plate 412, a compression spring 413 and a clamping chamber 502. The axial movement of the center rod 410 can be converted into the radial movement of the clamping plate 412 through the rack and pinion mechanism. When no external force is applied, the clamping plate 412 is in a contracted state under the pre-tightening force of the compression spring 413. When the drill string assembly 4 is not in place, the clamping plate 412 is also in a contracted state due to the space limitation of the inner wall of the rope drill rod string 3. At this time, the ball valve 4101 on the center rod 410 is in contact with the rubber sealing sleeve 408, and the built-in flow passage of the drill string assembly 4 is in a normally closed state. When the ground hole circulating system 1 opens the liquid force positive circulation, and the hanging ring 415 of the drill string assembly 4 is hung on the seat ring 503 of the drill string outer assembly 5, at this time, the clamping plate 412 reaches the clamping chamber 502 and has a radial opening space condition. When the flow pressure reaches the set value, the flow pushes the ball valve 4101 and drives the center rod 410 to move axially towards the hole bottom, and the clamping plate 412 is driven by the gear 411 and the rack 4102 transmission mechanism to open radially into the clamping chamber 502, preventing the drill string assembly 4 from moving upward during the coring drilling process, and achieving the positioning effect. Since the built-in flow passage of the drill string assembly 4 has been opened, the flow reaches the hole bottom through the drill string assembly 4 to cool the drill bit 508 and clean the hole bottom. When the ground hole circulating system 1 opens the reverse circulation, the flow enters the internal flow passage of the drill string assembly 4 from the annular gap between the rope drill rod string 3 and the drill string outer assembly 5 and the drill hole 8. One way of fluid enters the center hole 4162 of the mandrel 416 from the water passage hole 4251, and under the action of fluid, the center rod 410 moves towards the hole in the direction. The other way of fluid enters from the water passage hole 4161, and under the action of fluid, the ball valve 4101 is pushed and the center rod 410 moves towards the hole in the direction. At this time, the clamping plate 412 is in a contracted state under the rack and pinion transmission, and under the push of the two-way fluid, the center rod 410 contacts and compresses the rubber sealing sleeve 408 to close the flow passage, causing the pressure to increase. When the pressure increases enough to overcome the buoyant weight of the drill string assembly 4 and the core 7, the drill string assembly 4 and the core 7 move towards the hole along with the flow until they reach the hole fishing device 6.

[0043] The drill string assembly 4 is provided with a core full pipe or blockage alarm mechanism. When the core 7 is blocked or the core pipe 429 is full during drilling, the thrust force of the core 7 on the core pipe 429 compresses the return spring 417, causing the sliding sleeve 418 to move upward and block the water passage hole 4161, causing the pump pressure to rise sharply. The operator should stop drilling.

[0044] The drill string internal assembly 4 is designed with a single-action mechanism, mainly composed of thrust ball bearing 420, thrust ball bearing 422, and bearing housing 421. This mechanism prevents the core tube 429 from rotating with the drill string external assembly 5, thereby effectively reducing disturbance to the core 7. The horizontal hole thrust ball bearings 2420 and 422 can be replaced with tapered roller bearings to withstand the weight of the drill string.

[0045] The drill string assembly 4 is equipped with a one-way ball valve 426. During the core drilling process, as the core 7 continuously enters the core tube 429, the fluid in the core tube 427 flows out through the return water channel 4281, the one-way ball valve 424, and the water passage 4251. Due to the presence of the one-way ball valve 426, the fluid cannot enter the core tube 429 during the drilling process, thus avoiding scouring of the core 7.

[0046] The drill bit internal assembly is equipped with an adjusting nut 424. When the drill bit internal assembly 4 is hung on the drill bit external assembly 5, the adjusting nut 424 ensures that the gap between the snap ring seat 430 and the inner step of the drill bit 508 is at a certain set value.

[0047] The external assembly 5 of the drill bit is equipped with an upper reamer 504 and a lower reamer 507, which can maintain the borehole diameter evenly, avoid reducing the need for new drill bits to clean the hole, and also increase the stability of the drill bit, reduce swaying during drilling, and extend the life of the drill bit 508. The centering ring 506 can improve the stability of the core tube 429 and its coaxiality with the drill bit 508, allowing the core 7 to enter the core tube 429 more smoothly.

[0048] The borehole retrieval device 6 is used for retrieving the inner pipe assembly 4 and for the return water channel of the borehole reverse circulation. The return water connector 601 is threadedly connected to the retrieval seat 603. The retrieval device 602 is mounted on the inner step of the retrieval seat 603. The return water connector 601 can prevent the retrieval device 602 from moving upward. When the drill string inner assembly 4 moves towards the borehole, the retrieval spearhead 401 can push open the retrieval hook 6028. After the retrieval hook 401 is pushed open, the upward movement stops. After the pump is stopped, the drill string inner assembly 4 falls and is caught by the retrieval hook 6028 and stops at the borehole.

[0049] Drill string assembly 4 delivery stage, such as Figure 1 and Figure 7 As shown, the active drill rod 2 is connected to the wireline drill rod string 3, and the four-way ball valve 102 and the four-way ball valve 206 are opened. Figure 1The ball valve 4101 in the drill string inner assembly 4 is blocked by the rubber seal sleeve 408 through the gear rack mechanism under the action of the compression spring 413, and at the same time, the elastic clamping plate 412 is also in a contracted state due to the radial constraint of the rope drill pipe column 3. The ball valve 4101 also compresses the rubber seal sleeve 408 through the gear rack transmission mechanism, which can also block the liquid flow channel. Due to the closure of the built-in liquid flow channel of the drill string inner assembly 4, the liquid flow is forced to pass through the annular gap between the drill string inner assembly 4 and the rope drill pipe column 3 or the drill string outer assembly 5, and when passing through the double-acting booster piston 409, the V-shaped sealing piston is expanded under the action of the liquid force, so that the annular gap is reduced, the liquid flow pressure is increased to a certain extent, and the booster effect is achieved. The inner assembly 4 moves rapidly towards the hole bottom under the action of gravity and liquid force; the liquid flow returning to the hole mouth enters the mud pool 103 through the annular joint 105 and the four-way ball valve two 106.

[0050] Drilling coring phase, as shown in Figure 1 and Figure 8 The drill string inner assembly 4 is hung on the drill string outer assembly 5, which is the designed position during coring drilling. The suspension ring 415 of the drill string inner assembly 4 stops moving towards the hole bottom at the position of the seat ring 503 of the drill string outer assembly 5. The pump pressure is increased, which pushes the ball valve 4101 and the center rod 410 to move towards the hole bottom. The liquid flow channel of the drill string inner assembly 4 is opened, and the liquid flow circulation is restored. The liquid flow enters through the water passage 4061 and flows out from the water passage 4161 of the drill string inner assembly 4. The liquid flow reaches the hole bottom and returns to the annular joint 105 through the annular gap between the drill string outer assembly 5, the rope drill pipe column 3 and the drill hole, and then enters the mud pool 103 through the circulation pipeline; when the drill string inner assembly 4 is in place and the built-in liquid flow channel is opened, the elastic clamping plate 412 is expanded to the elastic clamping chamber 502. Due to the limitation of the elastic clamping chamber, the drill string inner assembly 4 will not jump up when the core 7 enters the core tube 429. When the drill string outer assembly 5 rotates, the mandrel 416 and the parts above it rotate synchronously with the drill string outer assembly 5, preventing excessive wear between the suspension ring 415 and the seat ring 503. When the core 7 is full or blocked during drilling, the core tube 429, the water return joint 425, the bearing sleeve 421 and the sliding sleeve seat 419 move towards the hole mouth to compress the return spring 417, and at the same time, the sliding sleeve 418 moves towards the hole mouth. When the sliding sleeve 418 moves to block the water passage 4161, the built-in liquid flow channel of the drill string inner assembly 4 is closed, the liquid flow circulation is interrupted, and the pressure is built up. The operator should immediately take the pump or drilling operation.

[0051] The drill string inner assembly 4 fishing recovery phase, as shown in Figure 2 and Figure 9As shown, when drilling is complete and the inner tube assembly 4 and core 7 need to be lifted to the borehole opening, the surface mud pump 102 is shut off. The fluid pressure on the ball valve 4101 disappears, and the spring plate 412 retracts under the action of the spring 413. Through the gear 411 and rack 4102 mechanism, the ball valve 4101 is driven to move towards the borehole opening. When it reaches the rubber sealing sleeve, the movement stops. The active drill rod 2 is removed, and the borehole retrieval device 6 is connected to the wireline coring drill rod string 3. The circulation pipeline 101 is connected, and the four-way ball valve 102 and the four-way ball valve 206 are operated respectively (rotated 90 degrees on the basis of positive circulation) to... Figure 2 The mud pump is turned on, and the fluid flows through four-way ball valve 102, circulation line 108, four-way ball valve 2, circulation line 3 109, annular joint 105, and the annular gap between the wireline drill string 3 and the borehole 8 to reach the bottom of the hole. One path of the bottom hole fluid flows through the annular gap between the drill string inner assembly 4 and the drill string outer assembly 5, and the water passage 4251 into the mandrel center hole 4162, pushing the centering rod 4104 towards the borehole opening. Another path of the bottom hole fluid flows through the annular gap between the drill string inner assembly 4 and the drill string outer assembly 5, and the water passage 4161 into the fluid flow channel of the drill string inner assembly, pushing the ball valve 4101 towards the borehole opening. Under the push of the two fluid flows, the center rod ball valve 4101 and the rubber sealing sleeve 408 cooperate with the built-in fluid flow channel of the drill string inner assembly 4. When the drill string is closed, except for a small amount of fluid flowing out from the annular space between the drill string assembly 4 and the wireline drill string 3, most of the fluid propels the drill string assembly 4 towards the borehole. Due to the pressurizing effect of the double-acting booster piston 409, the movement of the drill string assembly 4 can be accelerated to a certain extent. The upward flow of fluid flows into the mud pool 103 through the water outlet connector 601, circulation pipeline 101, four-way ball valve 102, circulation pipeline 107, and four-way ball valve 2. After the internal assembly reaches the borehole, it is grabbed by the retrieval device 602 and stops moving. The mud pump 104 is turned off, and the drill string assembly 4 and the retrieval device 602 are suspended on the retrieval device seat 603. The return water connector 601 is removed, and the drill string assembly 4 and the retrieval device 602 are pulled out of the borehole together, completing the retrieval and recovery operation.

[0052] The dual-action hydraulic delivery and salvage system of this invention has the following features:

[0053] 1. The main structural components of the hydraulic delivery and retrieval ropeless coring drill bit and the orifice circulation system are as follows: Through the cooperation of the coring drill bit and the orifice forward and reverse circulation system, the movement direction of the coring drill bit within the drill string is controlled, thereby realizing the delivery, coring, drilling, and retrieval operations of the coring drill bit.

[0054] 2. The core drilling tool is equipped with a gear and rack locking and unlocking mechanism. Through gear and rack transmission, the axial movement of the drill tool center rod can be converted into the radial movement of the spring plate. In cooperation with the spring plate chamber 502, the locking and unlocking of the drill tool internal assembly 4 is realized, thereby achieving the positioning function of the drill tool internal assembly 4.

[0055] 3. The coring drill is provided with a double-acting hydraulic intelligent valve, which cooperates with the locking and unblocking mechanism through the hydraulic valve to control the flow channel of the assembly in the drill. Under the action of positive circulation, when the assembly in the drill 4 does not reach the designed position of the assembly outside the drill, the flow channel is closed, and when the assembly in the drill 4 reaches the designed position of the assembly outside the drill, the pump pressure increases, and the flow channel is opened. Under the action of reverse circulation, the flow channel is always closed. The double-acting hydraulic intelligent valve can control the flow channel of the assembly in the drill 4.

[0056] 4. The coring drill is provided with a slide valve structure, which can realize the axial movement of the sliding sleeve 418 under the action of external force by overcoming the pre-tightening force of the return spring 417. Through the cooperation of the sliding sleeve 418 and the water hole 4251, the opening and closing of the water hole 4251 are realized, the pump pressure changes significantly, and the alarm function of full pipe or blockage during coring drilling is realized.

[0057] 5. The coring drill is provided with a double-acting booster piston 409, which expands under the action of liquid flow pressure, reduces the annular gap between the assemblies inside and outside the drill 5, and reduces the annular flow channel area. Under the condition of constant flow, the pressure will rise, which plays a role in boosting the pressure, can speed up the movement speed of the assembly in the drill 5 in the drill string, and improves the efficiency of the delivery and fishing operation.

[0058] 6. The main structure of the orifice fishing device 6, the fisher 602 is hung on the fisher seat 603, the water return connector 601 is connected with the fisher seat 603 by screw thread, and the two cooperate to fix the fisher 602 on the drill pipe string to prevent the fisher 602 from moving upward during fishing. The orifice fishing device 6 is mainly used for fishing and recovery operation of the assembly in the coring drill under the action of reverse circulation.

[0059] 7. The main structure of the orifice circulation system mainly includes circulation pipeline, four-way ball valve, mud pump 104, mud pool 103, driving drill pipe 2 and annular connector 105, which realizes the positive circulation and reverse circulation of the drilling fluid by cooperation of various mechanisms.

[0060] 8. The orifice circulation system is provided with two four-way ball valves, which can realize the switching of positive and reverse water supply of one valve. The water supply mode is switched once every 90 degrees of the ball valve. According to the demand, manual, pneumatic and electrical operation can be realized, which is convenient and fast, and realizes the effect of one valve with multiple functions.

[0061] The present application mainly uses hydraulic force to realize the delivery and fishing operation of the coring drill, without the need to equip a wireline coring winch and a fishing steel wire rope, which simplifies the equipment and operation process. At the same time, in the horizontal hole coring drilling, there is no need to equip a wireline hydraulic conveyor, which avoids the problem of low delivery efficiency or even failure caused by pressure leakage of the wireline conveyor.

[0062] It is to be understood that the application is not limited to the details of the above-exemplified embodiments and that the present application can be carried out in other concrete ways without departing from the spirit or essential characteristics of the application. Consequently, all changes and modifications that can suggest themselves to one skilled in the art have to be seen as being within the scope of the present application as defined by the following claims. The embodiments are to be considered in all respects as illustrative only and not restrictive of the application described and claimed herein. Reference symbols in the claims should not be construed as limiting the scope of the claims.

[0063] The above examples are illustrative of the principles and embodiments of the application. They are not meant to limit the scope of the application. The application is not limited to the above-described embodiments, but can be implemented in other ways without departing from the spirit or essential characteristics of the application.

Claims

1. A dual acting hydraulic drop shot fishing system, characterized by: Comprising A borehole circulating system comprising a mud pump, a circulating pipeline, a mud pool, a four-way ball valve one, a four-way ball valve two, a circulating pipeline one, a circulating pipeline two, a circulating pipeline three, a backwater joint and an annular gap joint; the liquid flow pumped by the mud pump enters the circulating pipeline through the four-way ball valve one, then flows through the central through hole of the active drill pipe, the wireline drill pipe column and the drill tool outer assembly to the borehole bottom, the borehole bottom liquid flow returns to the annular gap joint along the annular gap between the drill tool outer assembly, the wireline drill pipe column and the active drill pipe and the borehole, and finally returns to the mud pool through the four-way ball valve two and the circulating pipeline three; the liquid flow pumped by the mud pump enters the annular gap joint through the four-way ball valve one, the circulating pipeline two, the four-way ball valve two and the circulating pipeline three, then reaches the borehole bottom through the annular gap between the drill tool outer assembly, the wireline drill pipe column and the borehole, the borehole bottom liquid flow returns to the backwater joint along the central through hole of the drill tool outer assembly and the wireline drill pipe column, and finally returns to the mud pool through the circulating pipeline, the four-way ball valve one, the circulating pipeline one and the four-way ball valve two; And An active drill pipe which transmits the drilling pressure and torque of the surface drilling rig to the borehole bottom drill tool outer assembly through the wireline drill pipe column; And A drill tool inner assembly which is built in the central hole of the wireline drill pipe column, is hung on the drill tool outer assembly, and can move along the wireline drill pipe column; and A drill tool outer assembly which can be separated from the drill tool outer assembly and move to the ground borehole when the drill tool inner assembly is affected by the borehole backflow liquid force; And A borehole fishing device which holds the drill tool inner assembly when the drill tool inner assembly moves to the borehole fishing device, and realizes the fishing operation; The drill tool inner assembly is built with a liquid flow channel, the liquid flow direction of the liquid flow channel is that the liquid flow enters the upper central hole of the drill tool inner assembly through the water inlet hole, opens the ball valve under the liquid force, flows into the lower central hole of the drill tool inner assembly, finally flows out of the central hole of the drill tool inner assembly through the water outlet hole and enters the annular gap between the drill tool inner assembly and the drill tool outer assembly until the borehole bottom drill bit; the liquid flow channel is one-way normally closed, can be conducted in the liquid flow positive circulation process, and is closed in the liquid flow backflow circulation process; after the hanging ring seat of the drill tool inner assembly is hung on the seat ring of the drill tool outer assembly, the liquid flow positive circulation is started, the liquid flow channel is closed when the borehole bottom liquid flow pressure is less than the set value, and the liquid flow channel is gradually opened when the borehole bottom liquid flow pressure is greater than the set value; The drill tool inner assembly is provided with a double-acting booster piston, the V-shaped sealing structure is expanded under the action of the liquid flow, thereby reducing the annular gap with the inner wall of the wireline drill pipe column, and plays a role of pressure boosting in the liquid flow positive and backflow circulation process, and can accelerate the operation of the drill tool inner assembly.

2. The dual acting hydraulic drop shot fishing system of claim 1, wherein: The fishing spear mechanism is arranged in the drilling tool assembly, and comprises a fishing spear head, a fishing spear seat, a positioning pin, a positioning spring and an elastic cylindrical pin.

3. The dual acting hydraulic drop shot fishing system of claim 1, wherein: The gear and rack locking and unblocking mechanism is arranged in the drilling tool assembly, and comprises a rack arranged on a center rod, a gear, a clamping plate, a compression spring and a clamping chamber. When no external force is applied, the clamping plate is in a contracted state under the pre-tightening force of the compression spring. When the drilling tool assembly is not in place, the clamping plate is also in a contracted state due to the space limitation of the inner wall of the rope drill rod column. At this time, the ball valve on the center rod is in contact with the rubber sealing sleeve, and the built-in liquid flow channel of the drilling tool assembly is in a normally closed state. When the orifice circulating system opens the liquid force positive circulation, and the suspension ring seat of the drilling tool assembly is hung on the seat ring of the drilling tool outer assembly, the clamping plate reaches the clamping chamber at this time and has a radial opening space condition. When the liquid flow pressure reaches a set value, the liquid flow pushes the ball valve and drives the center rod to move axially towards the hole bottom, and the clamping plate is driven to open radially into the clamping chamber for positioning by the gear and rack transmission mechanism.

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