Electric control intelligent coring bit

Abstract

The invention provides a tool applied to the field of petroleum drilling, and particularly relates to an electric control intelligent coring drill bit which comprises a power module and a cutting module, a limiting switch is arranged in the cutting module, the drill bit normally drills, a rock core passes through the interior of the drill bit and enters a coring barrel, and when the top of the rock core in the coring barrel triggers the limiting switch, the limiting switch is switched on. The MCU receives a coring completion signal, the electromagnetic valve is controlled to be opened through the MCU, high-pressure drilling fluid enters a turbine cavity through a mandrel hole, under the action of the high-pressure drilling fluid, the turbine rotates to generate motion and power, the motion and the power are transmitted to the rotating ring through the rotating disc and the rotating sleeve, the rotating ring rotates to push the connecting rod, the connecting rod pushes the evenly-distributed cutting knives, and therefore coring is completed. And the uniformly distributed cutting knives and the coring cylinder form a sealing cavity, the cut rock core is placed in the sealing cavity, and the cut rock core is taken out after pulling out of the drill. The intelligent degree of the drilling coring bit can be effectively improved, and the drilling coring efficiency and success rate are effectively improved.

Description

Technical Field

[0001] This invention is applicable to the field of oil drilling, and specifically relates to an electrically controlled intelligent coring drill bit. Background Technology

[0002] Core sampling is a crucial step in oil drilling operations to obtain underground rock cores. Specialized coring equipment is used to penetrate deep into underground rock formations to collect rock samples, providing core data support for oil and gas exploration and development. This operation can visually present the stratigraphic structure, accurately obtain rock physical parameters, and help analyze oil and gas reservoir characteristics. It is an important basis for establishing stratigraphic profiles and formulating development plans, directly affecting the scientific and economic aspects of oilfield development.

[0003] However, current core drilling bits have many prominent defects. The core problem is the low core recovery rate, with core samples easily falling off and being lost in fractured formations. At the same time, core samples are susceptible to corrosion, and drilling fluid can also infiltrate the pores of the core samples, causing contamination and leading to distortion of the core's physical properties and hydrocarbon characteristics, thus affecting the accuracy of the analysis results. Summary of the Invention

[0004] The purpose of this invention is to propose an electrically controlled intelligent coring drill bit to solve the problems mentioned above, and to effectively improve the working quality and efficiency of the coring device by combining intelligent control.

[0005] To solve the above problems, the present invention adopts the following technical solution: the electrically controlled intelligent coring drill bit, characterized in that: the electrically controlled intelligent coring drill bit includes a power module and a cutting module.

[0006] The power module includes an upper connector, an upper connector sealing unit, a mandrel, an intelligent control sub, a battery pack, an intelligent control unit, a solenoid valve, a housing, a turbine retaining ring, a thrust bearing assembly, a turbine, a tapered guide tube, a one-way valve, a rotating disk, a rotating disk sealing unit, and a rotating sleeve. The upper connector is threaded to the intelligent control sub. The upper connector sealing unit is arranged in a groove in the upper connector to prevent drilling fluid from flowing into the intelligent control sub. The intelligent control sub is threaded to the housing. The battery pack and the intelligent control unit are installed in the intelligent control sub. The intelligent control unit includes an MCU, a solenoid valve drive circuit, and a limit switch signal receiving circuit. All circuit modules are integrated on a PCB board. The valve is connected to the outer shell via threads. The mandrel and turbine retaining ring are connected to the tapered guide tube via threads. The solenoid valve is installed in the mandrel hole and connected to the intelligent control unit via wires. The turbine and the tapered guide tube are clearance-fitted. The thrust bearing assembly consists of two thrust ball bearings, which are respectively arranged at both ends of the turbine. The rotating disk is connected to the turbine external spline via the internal spline of the rotating disk. The rotating disk sealing unit is arranged in the groove of the rotating disk to prevent drilling fluid from entering the cutting module. One end of the rotating sleeve is connected to the rotating disk boss via the groove of the rotating sleeve, and the other end is installed in the rotating ring hole A via the rotating sleeve boss. The turbine drives the rotating disk to rotate via splines, which in turn drives the lower cutting module to rotate, thus completing the core cutting.

[0007] The cutting module includes a flow divider, a limit switch, a core cylinder, a cutter, a connecting rod, a rotating ring, and a drill bit. The flow divider is connected to the core cylinder via threads. Three flow holes are evenly distributed around the flow divider and the core cylinder. The limit switch is installed in a groove at the bottom of the flow divider. When the rock core inside the core cylinder triggers the limit switch, the switch closes, generating an electrical signal. This signal is transmitted to the intelligent control unit via a wire. The core cylinder is connected to the drill bit via threads. The cutter is installed on the drill bit boss B through a cutter hole B. One end of the connecting rod is installed in the cutter hole A, and the other end is installed in the rotating ring hole B. One cutter and one connecting rod form a set, moving along the circumference of the rotating ring. Five sets of cutting blades are evenly distributed. After the five blades close, they form a sealed space with the cavity inside the core tube. The rotating ring is installed in the drill bit boss A through the rotating ring groove, so that the rotating ring can only rotate within a set angle range. The drill bit has an inner hole for the rock core to enter the core tube along the hole wall. Three drill bit guide holes are evenly distributed around the circumference of the drill bit. The rotating ring hole A, rotating ring groove and rotating ring hole B are evenly distributed in five sets around the circumference of the rotating ring. The upper power module drives the rotating ring to rotate, so that the connecting rod and the cutting blade rotate to cut the rock core. The five sets of cutting blades close, fixing the drilled rock core in the sealed space formed by the cutting blade and the core tube, thus completing the core extraction function.

[0008] As a further technical solution of the present invention, the electrically controlled intelligent coring drill bit is characterized in that: three guide holes are evenly distributed around the core shaft, and solenoid valves are evenly distributed in the guide holes. The intelligent control unit controls the opening of the solenoid valves to realize the opening of the power module, thereby cutting the rock core.

[0009] As a further technical solution of the present invention, the electrically controlled intelligent coring drill bit is characterized in that: the outer shell has three drainage holes evenly distributed around its circumference, and one-way valves are evenly distributed in the drainage holes, so as to realize that the drilling fluid in the turbine cavity flows out of the cavity in one direction and into the well.

[0010] As a further technical solution of the present invention, the electrically controlled intelligent coring drill bit is characterized in that: the diversion plate, the coring cylinder, and the drill bit are evenly distributed with three guide holes in the circumference, so that the drilling fluid flows out of the drill bit through the guide holes, bypassing the inside of the coring cylinder, and avoiding the core from being contaminated by the drilling fluid.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] Utilizing intelligent control technology, the opening of the solenoid valve allows high-pressure drilling fluid to flow into the turbine, converting the pressure energy of the drilling fluid into the kinetic energy required for the cutting module to operate. This kinetic energy drives the five circumferentially distributed cutting blades to close, achieving core cutting. By incorporating a core scavenging cylinder and a drilling fluid diversion plate, the core recovery rate and integrity are improved while preventing core contamination by the drilling fluid. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a sectional view of the upper connector;

[0015] Figure 3 This is a sectional view of the mandrel;

[0016] Figure 4 Axonometric drawing of the turbine;

[0017] Figure 5 Axonometric drawing of the rotating disk;

[0018] Figure 6 Axonometric drawing of the rotating sleeve;

[0019] Figure 7 Axonometric drawing of the cutting tool;

[0020] Figure 8 Axonometric drawing of a rotating ring;

[0021] Figure 9 Axonometric drawing of the drill bit;

[0022] Figure 10 This is a diagram showing the state transition during core cutting.

[0023] Figure 11 This is the logic diagram for the control unit;

[0024] Figure 12 This is a flowchart of the device's workflow;

[0025] In the diagram: 1-Upper connector, 101-Upper connector groove, 2-Upper connector sealing unit, 3-Mandrel, 301-Mandrel hole, 4-Intelligent control short section, 5-Battery pack, 6-Intelligent control unit, 7-Solenoid valve, 8-Housing shell, 9-Turbine retaining ring, 10-Thrust bearing assembly, 11-Turbine, 12-Conical guide tube, 13-One-way valve, 14-Rotating disk, 1401-Rotating disk boss, 1402-Rotating disk internal spline, 1403-Rotating disk groove, 15-Rotating disk sealing unit, 16- Rotating sleeve, 1601-Rotating sleeve groove, 1602-Rotating sleeve boss, 17-Diverter plate, 18-Limit switch, 19-Core sampler, 20-Cutter, 2001-Cutter hole A, 2002-Cutter hole B, 21-Connecting rod, 22-Rotating ring, 2201-Rotating ring hole A, 2202-Rotating ring groove, 2203-Rotating ring hole B, 23-Drill bit, 2301-Drill bit boss A, 2302-Drill bit inner hole, 2303-Drill bit boss B, 2304-Drill bit guide hole. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are only a part of the present invention, and not all of it. Other embodiments obtained by those skilled in the art based on these embodiments without creative effort are also within the protection scope of the present invention.

[0027] Reference Figure 1 An electrically controlled intelligent coring drill bit, characterized in that: the electrically controlled intelligent coring drill bit includes a power module and a cutting module.

[0028] The power module includes an upper connector 1, an upper connector sealing unit 2, a spindle 3, an intelligent control sub 4, a battery pack 5, an intelligent control unit 6, a solenoid valve 7, a housing 8, a turbine retaining ring 9, a thrust bearing assembly 10, a turbine 11, a tapered guide tube 12, a one-way valve 13, a rotating disk 14, a rotating disk sealing unit 15, and a rotating sleeve 16. The upper connector 1 is connected to the intelligent control sub 4 via threads. The upper connector sealing unit 2 is arranged in the upper connector groove 101 to prevent drilling fluid in the upper connector 1 from flowing into the intelligent control sub 4. The intelligent control sub 4 is connected to the housing 8 via threads. The battery pack 5 and the intelligent control unit 6 are installed in the intelligent control sub 4. The intelligent control unit 6 includes an MCU, a solenoid valve drive circuit, and a limit switch signal receiving circuit. Each circuit module is integrated on a PCB board. The one-way valve 13 is connected to the housing 8 via threads. The shell 8 is connected, the mandrel 3 and the turbine fixing ring 9 are connected to the tapered guide tube 12 by threads, the solenoid valve 7 is installed in the mandrel hole 301 and connected to the intelligent control unit 6 by wires, the turbine 11 and the tapered guide tube 12 are clearance fit, the thrust bearing assembly 10 is composed of two thrust ball bearings, which are respectively arranged at both ends of the turbine 11, the rotating disk 14 is connected to the turbine outer spline 1101 through the rotating disk inner spline 1402, the rotating disk sealing unit 15 is arranged in the rotating disk groove 1403 to prevent drilling fluid from flowing into the cutting module, one end of the rotating sleeve 16 is connected to the rotating disk boss 1401 through the rotating sleeve groove 1601, and the other end is installed in the rotating ring hole A2201 through the rotating sleeve boss 1602. The turbine 11 drives the rotating disk 14 to rotate through the spline, which in turn drives the lower cutting module to rotate, thus completing the core cutting.

[0029] The cutting module includes a flow divider 17, a limit switch 18, a core tube 19, a cutter 20, a connecting rod 21, a rotating ring 22, and a drill bit 23. The flow divider 17 is connected to the core tube 19 by threads. The flow divider 17 and the core tube 19 have three flow holes evenly distributed around their circumference. The limit switch 18 is installed in a groove at the bottom of the flow divider 17. When the rock core in the core tube triggers the limit switch 18, the switch closes and generates an electrical signal. The electrical signal is transmitted to the intelligent control unit 6 through a wire. The core tube 19 is connected to the drill bit 23 by threads. The cutter 20 is installed on the drill bit boss B2303 through the cutter hole B2002. One end of the connecting rod 21 is installed in the cutter hole A2001, and the other end is installed in the rotating ring hole B2203. A cutter 20 and a connecting rod 21 form a set, which runs along the rotating ring 23. Five sets of cutting blades 20 are evenly distributed around the circumference. After the five cutting blades 20 are closed, they form a sealed space with the cavity inside the core tube 19. The rotating ring 22 is installed in the drill bit boss A2301 of the drill bit 23 through the rotating ring groove 2202, so that the rotating ring 22 can only rotate within a set angle range. The drill bit 23 has an inner drill bit hole 2302, which allows the rock core to enter the core tube 19 along the hole wall. The drill bit 23 has three drill bit guide holes 2304 evenly distributed around the circumference. The rotating ring hole A2201, the rotating ring groove 2202 and the rotating ring hole B2203 are evenly distributed in five sets around the circumference of the rotating ring 22. The upper power module drives the rotating ring 22 to rotate, so that the connecting rod 21 and the cutting blades 20 rotate to cut the rock core, realize the closure of the five sets of cutting blades, and fix the drilled rock core in the sealed space formed by the cutting blades 20 and the core tube 19, thus completing the core extraction function.

[0030] Reference Figure 11 The intelligent control unit 6 integrates a solenoid valve 7 drive circuit and a limit switch 18 signal receiving circuit. The intelligent control unit 6, solenoid valve 7, and limit switch 18 are powered by the battery pack 5. During the drilling and core extraction process, the MCU collects the limit switch signal in real time. When the limit switch is triggered, the MCU detects the trigger signal and controls the solenoid valve drive circuit to open the solenoid valve, thereby realizing the cutting of the rock core.

[0031] In one specific embodiment, an electrically controlled intelligent coring drill bit is lowered into the well. The upper power unit starts the drill bit to rotate and drill for coring. At the same time, the intelligent control unit 6 collects the status signal of the limit switch in real time. At this time, the high-pressure drilling fluid is diverted through the diverter plate 17 and flows out from the drill bit guide hole 2304. The drill bit continues to drill, and the amount of rock core obtained in the coring cylinder 19 gradually increases. When the top of the rock core triggers the limit switch 18, the control unit 6 receives the signal and controls the solenoid valve 7 to open. The high-pressure drilling fluid flows into the turbine cavity through the mandrel hole 301. Under the action of the high-pressure drilling fluid, the turbine 11 rotates 30°, which in turn drives the rotating disk 14, rotating sleeve 16, and rotating ring 22 to rotate 30°. The cutter closes and cuts the rock core. After the coring process is completed, the cutter and the coring cylinder form a sealed cavity, so that the rock core is fixed in the sealed cavity. After the drill is pulled out, the obtained rock core is taken out.

Claims

1. An electrically controlled intelligent coring drill bit, characterized in that: The electrically controlled intelligent coring drill bit includes a power module and a cutting module; The power module includes an upper connector (1), an upper connector sealing unit (2), a spindle (3), an intelligent control sub (4), a battery pack (5), an intelligent control unit (6), a solenoid valve (7), a housing (8), a turbine retaining ring (9), a thrust bearing assembly (10), a turbine (11), a tapered guide pipe (12), a one-way valve (13), a rotating disk (14), a rotating disk sealing unit (15), and a rotating sleeve (16). The upper connector (1) is connected to the intelligent control sub (4) by threads. The upper connector sealing unit (2) is arranged in the upper connector groove (101) to prevent drilling fluid in the upper connector (1) from flowing into the intelligent control sub (4). The intelligent control sub (4) is connected to the housing (8) by threads. The battery pack (5) and the intelligent control unit (6) are installed in the intelligent control sub (4). The intelligent control unit (6) includes an MCU, a solenoid valve drive circuit, and a limit switch signal receiving circuit. Each circuit module is integrated on a PCB board. The one-way valve (13) The spindle (3) and turbine retaining ring (9) are connected to the outer casing (8) by threads. The spindle (3) and turbine retaining ring (9) are connected to the tapered guide tube (12) by threads. The solenoid valve (7) is installed in the spindle hole (301) and connected to the intelligent control unit (6) by wires. The turbine (11) and the tapered guide tube (12) are clearance fit. The thrust bearing assembly (10) consists of two thrust ball bearings, which are respectively arranged at both ends of the turbine (11). The rotating disk (14) is connected to the outer casing of the turbine by the internal spline (1402) of the rotating disk. The rotating disk sealing unit (15) is arranged in the rotating disk groove (1403) to prevent drilling fluid from entering the cutting module. One end of the rotating sleeve (16) is connected to the rotating disk boss (1401) through the rotating sleeve groove (1601), and the other end is installed in the rotating ring hole A (2201) through the rotating sleeve boss (1602). The turbine (11) drives the rotating disk (14) to rotate through the spline, which in turn drives the lower cutting module to rotate, thus completing the core cutting. The cutting module includes a flow divider (17), a limit switch (18), a core sampler (19), a cutter (20), a connecting rod (21), a rotating ring (22), and a drill bit (23). The flow divider (17) is connected to the core sampler (19) by threads. The flow divider (17) and the core sampler (19) have three flow holes evenly distributed around their circumference. The limit switch (18) is installed in the groove at the bottom of the flow divider (17). When the rock core in the core sampler triggers the limit switch (18), the limit switch (18) is activated. When the switch is closed, an electrical signal is generated. The electrical signal is transmitted to the intelligent control unit (6) through a wire. The core tube (19) is connected to the drill bit (23) through a thread. The cutter (20) is installed on the drill bit boss B (2303) through the cutter hole B (2002). One end of the connecting rod (21) is installed in the cutter hole A (2001), and the other end is installed in the rotating ring hole B (2203). A cutter (20) and a connecting rod (21) form a set. Five sets of rotating rings (22) are evenly distributed around the circumference. After the five cutting blades (20) are closed, they form a sealed space with the cavity inside the core tube (19). The rotating rings (22) are installed in the drill bit boss A (2301) of the drill bit (23) through the rotating ring groove (2202), so that the rotating rings (22) can only rotate within a set angle range. The drill bit (23) has an inner hole (2302) for the rock core to enter the core tube (19) along the hole wall. The drill bit (23) is evenly distributed around the circumference. Three drill bit guide holes (2304), rotating ring hole A (2201), rotating ring groove (2202) and rotating ring hole B (2203) are evenly distributed in five sets along the circumference of the rotating ring (22). The upper power module drives the rotating ring (22) to rotate, so that the connecting rod (21) and the cutter (20) rotate to cut the rock core, realize the closure of the five sets of cutters, fix the drilled rock core in the sealed space formed by the cutter (20) and the core tube (19), and complete the core extraction function.

2. The electrically controlled intelligent coring drill bit according to claim 1 is characterized in that: The mandrel (3) has three flow guide holes evenly distributed around its circumference, and the solenoid valves (7) are evenly distributed in the flow guide holes. The intelligent control unit (6) controls the opening of the solenoid valves (7) to realize the opening of the power module, thereby cutting the rock core.

3. The electrically controlled intelligent coring drill bit according to claim 1 is characterized in that: The outer shell (8) has three vent holes evenly distributed around its circumference, and one-way valves (13) are evenly distributed in the vent holes to realize that the drilling fluid in the turbine cavity flows out of the cavity in one direction and into the well.

4. The electrically controlled intelligent coring drill bit according to claim 1 is characterized in that: The diversion plate (17), core tube (19), and drill bit (23) are all circumferentially distributed with three guide holes, so that the drilling fluid flows through the guide holes and out of the drill bit (23), bypassing the inside of the core tube (19) and avoiding the core from being contaminated by the drilling fluid.

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