Shear type supporting eccentric wedge for directional drilling of ice layer

Abstract

The invention discloses a shear type supporting eccentric wedge for ice layer directional drilling, which comprises a guide mechanism, a driving motor, a supporting mechanism and a control mechanism, the driving motor is assembled at the bottom of the guide mechanism, the supporting mechanism is connected to the lower part of the driving motor, and the control mechanism is assembled in the guide mechanism. The control mechanism is connected with the driving motor and the supporting mechanism and controls the driving motor to drive the supporting mechanism to work. The eccentric wedge has the obvious advantages that the supporting force is strong, and the eccentric wedge is thoroughly prevented from being frozen in the hole. The supporting part can avoid the situation that the coring drilling tool moves downwards and deviates from the coring position due to unstable supporting when deflecting through the eccentric wedge, and an ice core at the designated depth cannot be obtained. A heating wire is arranged in the supporting arm, and the eccentric wedge can be prevented from being frozen in the hole and cannot be lifted out. The repeated coring precision is effectively improved, and in-hole accidents are avoided.

Description

Technical Field

[0001] The present invention relates to a scissors support eccentric wedge, and in particular to a scissors support eccentric wedge for ice layer directional drilling. Background Art

[0002] At present, obtaining ice core samples inside polar ice sheets is a key technology for deeply understanding the past climate conditions of the Earth to predict future climate change trends. By analyzing the chemical components in the ice cores, the gas components in the bubbles, and other physical properties, it is possible to reconstruct past climate changes, such as temperature, atmospheric composition, precipitation, and sea level changes. With the development of ice core research, the demand for the number of ice cores in related scientific research is increasing day by day. However, limited by the complexity of the polar environment, the working time per year is limited, and problems such as ice core breakage, loss, or contamination are extremely likely to occur during the process of drilling ice cores, which hinders the development of ice core research. Therefore, obtaining additional ice cores at a specified depth in the borehole is a new development direction in the field of polar ice sheet drilling at present, that is, the ice layer repeated coring drilling technology.

[0003] Currently, the commonly used method for ice layer repeated coring is to lower an eccentric wedge to a specified depth in the borehole and support it on the borehole wall, and then lower the coring tool. When the tool contacts the eccentric wedge, the tool will deflect under the action of the inclined plane of the eccentric wedge, and then repeated coring work is carried out. Existing eccentric wedges have problems of unstable support and being extremely prone to sliding downward. If a sliding accident occurs, in the light case, the position of repeated coring will change, and ice cores at the expected depth cannot be obtained. In the heavy case, the eccentric wedge will slide to the bottom of the borehole, unable to complete the repeated coring work, and even difficult to retrieve the eccentric wedge, which will cause serious impacts on the borehole. If corrective measures are taken after the eccentric wedge slides down, not only a large amount of time will be wasted, but also the cost will increase. Summary of the Invention

[0004] The main purpose of the present invention is to provide a scissors support eccentric wedge for ice layer directional drilling to solve the problem that existing eccentric wedges in the process of polar drilling for ice cores have unstable support and are extremely prone to sliding downward.

[0005] The scissors support eccentric wedge for ice layer directional drilling provided by the present invention includes a guiding mechanism, a driving motor, a supporting mechanism, and a control mechanism. The driving motor is assembled at the bottom of the guiding mechanism, the supporting mechanism is connected to the lower part of the driving motor, the control mechanism is assembled in the guiding mechanism, the control mechanism is respectively connected to the driving motor and the supporting mechanism, and the control mechanism controls the driving motor to drive the working of the supporting mechanism.

[0006] The top end of the guiding mechanism is equipped with a connector which is connected to the fishing tool. An eccentric wedge with an inclined surface is assembled on the upper part of the guiding mechanism. The connector is assembled on the top surface of the eccentric wedge. The connector is a strong magnetoelectric connector and is connected to the magnetic force controller in the control mechanism. When the fishing tool is connected to the guiding mechanism through the connector, the electrical signal of the armored cable in the fishing tool is input into the magnetic force controller through the connector, so that the magnetic force controller controls the opening and closing of the connector.

[0007] The support mechanism includes an upper sleeve, a lower sleeve and support arms. The top end of the upper sleeve is fixedly connected to the fixing frame of the driving motor. A plurality of guiding columns are arranged around the lower part of the upper sleeve. The upper part of the lower sleeve is sleeved on the lower part of the upper sleeve. Guide grooves are opened at the corresponding positions on the side wall of the upper part of the lower sleeve where the guiding columns of the upper sleeve are assembled. The guide grooves can move up and down along the guiding columns. The output shaft of the driving motor is screwed to the inner side wall of the lower part of the lower sleeve. When the output shaft of the driving motor rotates, it can drive the lower sleeve to move up and down along the guiding columns at the lower part of the upper sleeve. A plurality of support arms are assembled and arranged around the upper sleeve and the lower sleeve. The upper and lower parts of each support arm are respectively connected to the outer side walls of the upper sleeve and the lower sleeve through brackets. When the lower sleeve moves, it can drive the support arms to extend and contract. Heating wires are embedded in the circumferential direction of the outer side surface of the support arms, and the heating wires are connected to the control mechanism. The control mechanism controls the power-on heating and power-off cooling of the heating wires.

[0008] The brackets connecting the support arms to the upper sleeve and the lower sleeve are scissor brackets. Each scissor bracket is composed of a Z-shaped rod and a three-link rod. The middle rod of the Z-shaped rod and the three-link rod is pivotally connected through a pin shaft. The three rods in the three-link rod are sequentially pivotally connected through pin shafts. The upper end of the Z-shaped rod is pivotally connected to the first connection block on the outer side wall of the upper sleeve through a pin shaft. The lower end of the Z-shaped rod is connected to the sliding groove opened in the lower part of the inner side of the support arm through a pin shaft. The lower end of the Z-shaped rod can move up and down in the sliding groove driven by the pin shaft. The top end of the first rod at the upper end of the three-link rod is pivotally connected to the second connection block on the upper part of the inner side of the support arm through a pin shaft. The lower end of the third rod at the lower part of the three-link rod is pivotally connected to the third connection block on the outer side wall of the lower sleeve through a pin shaft. When the lower sleeve moves up and down, it drives the support arms to extend and contract through the brackets.

[0009] The control mechanism includes a magnetic controller, a signal input module, a signal processing module, and a signal output module. The signal input module is connected to the signal processing module, and the signal processing module is connected to the signal output module. The signal input module can transmit the received data to the signal processing module in real time for processing. After processing the received data, the signal processing module sends it to the signal output module for external transmission. The signal input module is connected to the connector through the magnetic controller. The signal input module can receive the signal transmitted by the connector. The signal output module is also connected to the drive motor. The signal output module provides a working instruction for the drive motor to control the expansion and contraction of the support arm. The signal output module is also connected to the heating wire. When the eccentric wedge is withdrawn, the signal is transmitted to the heating wire through the signal output module, causing the heating wire to melt the hole wall and disconnect the support arm from the hole wall. After the lifting is completed, the signal output module instructs the heating wire to stop working, and the eccentric wedge is withdrawn.

[0010] The above drive motor, connector, magnetic controller, signal input module, signal processing module, and signal output module are all assembled from existing equipment. Therefore, the specific models and specifications are not elaborated.

[0011] The working principle of the present invention:

[0012] When the scissor support eccentric wedge for directional drilling in ice layer provided by the present invention is in use, first, the eccentric wedge is lowered to a specified position in the borehole by using the armored cable and the fishing tool. The control signal sent from the surface is transmitted to the control mechanism through the armored cable, the fishing tool, and the connector of the eccentric wedge. The control mechanism instructs the drive motor to drive the support arm to expand, and the eccentric wedge is supported on the hole wall. Subsequently, the magnetic force of the connector is reduced, and the fishing tool is withdrawn from the hole. Then, the repeated coring tool is lowered. When the coring tool contacts the inclined plane guiding mechanism of the eccentric wedge, it will deflect under the action of the deflecting plane and perform lateral repeated coring drilling work. After the coring work is completed, the coring tool is withdrawn from the hole, and then the fishing tool is lowered and connected to the eccentric wedge through the connector. The control signal sent from the surface is transmitted to the control mechanism through the armored cable, the fishing tool, and the connector again. The control mechanism instructs the drive motor to drive the support arm to retract. At this time, the control mechanism automatically starts the heating wire embedded on the outer side of the support arm to melt the ice between the support arm and the hole wall until they are disengaged. Finally, the eccentric wedge is withdrawn from the borehole to complete the repeated coring work.

[0013] The beneficial effects of the present invention:

[0014] Compared with the existing eccentric wedges, the scissor support eccentric wedge for ice layer directional drilling provided by the present invention has obvious advantages of strong supporting force and completely preventing the eccentric wedge from freezing in the hole. The supporting part can prevent the coring tool from moving downward due to unstable support when deflecting through the eccentric wedge, deviating from the coring position and unable to obtain the ice core at the specified depth. Heating wires are arranged inside the support arm, which can prevent the eccentric wedge from freezing in the hole and being unable to be lifted out. It effectively improves the repeated coring accuracy and avoids downhole accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the overall structure of the eccentric wedge described in the present invention.

[0016] Figure 2 It is the schematic diagram of the connection relationship of the support mechanism described in the present invention.

[0017] Figure 3 It is the schematic diagram of the connection relationship between the upper sleeve and the lower sleeve described in the present invention.

[0018] Figure 4 It is the partial structure schematic diagram of the deflecting surface described in the present invention.

[0019] Figure 5 It is the schematic diagram of the scissor support structure described in the present invention.

[0020] Figure 6 It is the schematic diagram of the working state of the eccentric wedge described in the present invention.

[0021] Figure 7 It is the schematic diagram of the lifting and fishing state of the eccentric wedge described in the present invention.

[0022] Figure 8 It is the structural block diagram of the control mechanism described in the present invention.

[0023] The markings in the above figures are as follows:

[0024] 1. Guide mechanism 2. Driving motor 3. Support mechanism 4. Control mechanism

[0025] 5. Connector 6. Fishing tool 7. Magnetic controller 8. Armored cable

[0026] 9. Upper sleeve 10. Lower sleeve 11. Support arm 12. Guide post

[0027] 13. Guide groove 14. Bracket 15. Heating wire 16. Z-shaped rod

[0028] 17. Three-link 18. First connection block 19. Chute 20. Second connection block

[0029] 21. Third connection block 22. Signal input module 23. Signal processing module

[0030] 24. Signal output module. Detailed implementation

[0031] Please refer to Figures 1 to 8 as shown in

[0032] The shear support eccentric wedge for ice layer directional drilling provided by the present invention includes a guiding mechanism 1, a driving motor 2, a support mechanism 3 and a control mechanism 4. Among them, the driving motor 2 is assembled at the bottom of the guiding mechanism 1, the support mechanism 3 is connected to the lower part of the driving motor 2, the control mechanism 4 is assembled in the guiding mechanism 1, the control mechanism 4 is respectively connected to the driving motor 2 and the support mechanism 3, and the control mechanism 4 controls the driving motor 2 to drive the operation of the support mechanism 3.

[0033] A connection head 5 is assembled at the top end of the guiding mechanism 1 and is connected to a fishing tool 6. An eccentric wedge with an inclined surface is assembled on the upper part of the guiding mechanism 1. The connection head 5 is assembled on the top surface of the eccentric wedge. The connection head 5 is a strong magnetic electric joint, and the connection head 5 is connected to a magnetic force controller 7 in the control mechanism 4. During the connection process of the fishing tool 6 and the guiding mechanism 1 through the connection head 5, the electrical signal of the armored cable 8 in the fishing tool 6 is input into the magnetic force controller 7 through the connection head 5, so that the magnetic force controller 7 controls the opening and closing of the connection head 5.

[0034] The support mechanism 3 includes an upper sleeve 9, a lower sleeve 10 and support arms 11. Among them, the top end of the upper sleeve 9 is fixedly connected to the fixed frame of the driving motor 2. A plurality of guiding columns 12 are arranged around the lower part of the upper sleeve 9. The upper part of the lower sleeve 10 is sleeved on the lower part of the upper sleeve 9. Guiding grooves 13 are provided at the corresponding positions on the side wall of the upper part of the lower sleeve 10 where the guiding columns 12 of the upper sleeve 9 are assembled. The guiding grooves 13 can move up and down along the guiding columns 12. The output shaft of the driving motor 2 is screwed to the inner side wall of the lower part of the lower sleeve 10. During the rotation of the output shaft of the driving motor 2, the lower sleeve 10 can be driven to move up and down along the guiding columns 12 at the lower part of the upper sleeve 9. A plurality of support arms 11 are assembled and arranged around the upper sleeve 9 and the lower sleeve 10. The upper and lower parts of each support arm 11 are respectively connected to the outer side walls of the upper sleeve 9 and the lower sleeve 10 through brackets 14. During the movement of the lower sleeve 10, the support arms 11 can be driven to expand and contract. Heating wires 15 are embedded in the circumferential direction of the outer side surface of the support arms 11, and the heating wires 15 are connected to the control mechanism 4. The control mechanism 4 controls the energization heating and power-off cooling of the heating wires 15.

[0035] The bracket 14 connecting the support arm 11 to the upper sleeve 9 and the lower sleeve 10 is a scissor bracket. Each scissor bracket is composed of a Z-shaped rod 16 and a three-link rod 17. The middle rod of the Z-shaped rod 16 and the three-link rod 17 is pivotally connected by a pin shaft. The three rods in the three-link rod 17 are sequentially pivotally connected by pin shafts. The upper end of the Z-shaped rod 16 is pivotally connected to the first connecting block 18 on the outer side wall of the upper sleeve 9 by a pin shaft. The lower end of the Z-shaped rod 16 is connected to the chute 19 opened in the lower part of the inner side of the support arm 11 by a pin shaft. The lower end of the Z-shaped rod 16 can move up and down in the chute 19 driven by the pin shaft. The top of the first rod at the upper end of the three-link rod 17 is pivotally connected to the second connecting block 20 on the upper part of the inner side of the support arm 11 by a pin shaft. The lower end of the third rod at the lower part of the three-link rod 17 is pivotally connected to the third connecting block 21 on the outer side wall of the lower sleeve 10 by a pin shaft. During the up and down movement of the lower sleeve 10, the support arm 11 is driven to expand and contract through the bracket 14.

[0036] The control mechanism 4 includes a magnetic controller 7, a signal input module 22, a signal processing module 23, and a signal output module 24. Among them, the signal input module 22 is connected to the signal processing module 23, and the signal processing module 23 is connected to the signal output module 24. The signal input module 22 can transmit the received data to the signal processing module 23 for processing in real time. The signal processing module 23 processes the received data and sends it to the signal output module 24 for external transmission. The signal input module 22 is connected to the connector 5 through the magnetic controller 7. The signal input module 22 can receive the signal transmitted by the connector 5. The signal output module 24 is also connected to the drive motor 2. The signal output module 24 provides a working instruction for the drive motor 2 to control the expansion and contraction of the support arm 11. The signal output module 24 is also connected to the heating wire 15. When the eccentric wedge is lifted, the signal is transmitted to the heating wire 15 through the signal output module 24, so that the heating wire 15 heats the hole wall to melt and disconnect the support arm 11 from the hole wall. After the lifting is completed, the signal output module 24 instructs the heating wire 15 to stop working and the eccentric wedge is lifted.

[0037] The above drive motor 2, connector 5, magnetic controller 7, signal input module 22, signal processing module 23, and signal output module 24 are all assembled from existing equipment. Therefore, the specific models and specifications are not elaborated.

[0038] The working principle of the present invention:

[0039] When the scissor support eccentric wedge for ice layer directional drilling provided by the present invention is in use, first, the eccentric wedge is lowered to a specified position in the borehole by using the armored cable 8 and the fishing tool 6. The control signal sent from the surface is transmitted to the control mechanism 4 through the armored cable 8, the fishing tool 6, and the connector 5 of the eccentric wedge. The control mechanism 4 commands the drive motor 2 to drive the support arm 11 to unfold, and the eccentric wedge is supported on the hole wall. Subsequently, the magnetic force of the connector 5 is reduced, and the fishing tool 6 is lifted out of the hole. Then, the repeated coring tool is lowered. When the coring tool contacts the inclined plane guiding mechanism 1 of the eccentric wedge, it will deflect under the action of the deflecting plane, and the lateral repeated coring drilling work is carried out. After the coring work is completed, the coring tool is lifted out of the hole, and then the fishing tool 6 is lowered and connected to the eccentric wedge through the connector 5. The control signal sent from the surface is again transmitted to the control mechanism 4 through the armored cable 8, the fishing tool 6, and the connector 5. The control mechanism 4 commands the drive motor 2 to drive the support arm 11 to retract. At this time, the control mechanism 4 automatically activates the heating wire 15 embedded on the outer side of the support arm 11 to melt the ice between the support arm 11 and the hole wall until they are disengaged. Finally, the eccentric wedge is lifted out of the borehole to complete the repeated coring work.

Claims

1. A shear support eccentric wedge for ice layer directional drilling, characterized in that: It includes a guiding mechanism, a driving motor, a supporting mechanism and a control mechanism. The driving motor is assembled at the bottom of the guiding mechanism, the supporting mechanism is connected to the lower part of the driving motor, and the control mechanism is assembled inside the guiding mechanism. The control mechanism is respectively connected to the driving motor and the supporting mechanism, and the control mechanism controls the driving motor to drive the operation of the supporting mechanism.

2. The shear support eccentric wedge for ice layer directional drilling according to claim 1, characterized in that: A connector is assembled at the top end of the guiding mechanism and connected to the fishing tool. An eccentric wedge with an inclined plane is assembled on the upper part of the guiding mechanism. The connector is assembled on the top surface of the eccentric wedge. The connector is a strong magnetic electrical connector and is connected to the magnetic force controller inside the control mechanism. During the connection process between the fishing tool and the guiding mechanism through the connector, the electrical signal of the armored cable inside the fishing tool is input into the magnetic force controller through the connector, so that the magnetic force controller controls the opening and closing of the connector.

3. A scissor support eccentric wedge for ice layer directional drilling according to claim 1, characterized in that: The supporting mechanism includes an upper sleeve, a lower sleeve and supporting arms. The top end of the upper sleeve is fixedly connected to the fixed frame of the driving motor. A plurality of guiding columns are arranged around the lower part of the upper sleeve. The upper part of the lower sleeve is sleeved on the lower part of the upper sleeve. Guide grooves are opened at the corresponding positions on the side wall of the upper part of the lower sleeve where the guiding columns of the upper sleeve are assembled. The guide grooves can move up and down along the guiding columns. The output shaft of the driving motor is screwed to the inner side wall of the lower part of the lower sleeve. During the rotation of the output shaft of the driving motor, it can drive the lower sleeve to move up and down along the guiding columns at the lower part of the upper sleeve. A plurality of supporting arms are assembled and arranged around the upper sleeve and the lower sleeve. The upper and lower parts of each supporting arm are respectively connected to the outer side walls of the upper sleeve and the lower sleeve through brackets. During the movement of the lower sleeve, it can drive the supporting arms to expand and contract. Heating wires are embedded around the outer side surface of the supporting arms and are connected to the control mechanism. The control mechanism controls the power-on heating and power-off cooling of the heating wires.

4. A scissors support eccentric wedge for ice layer directional drilling according to claim 3, characterized in that: The brackets connecting the supporting arms to the upper sleeve and the lower sleeve are scissor brackets. Each scissor bracket is composed of a Z-shaped rod and a three-link rod. The middle rod of the Z-shaped rod and the three-link rod is pivotally connected through a pin shaft. The three rods in the three-link rod are sequentially pivotally connected through pin shafts. The upper end of the Z-shaped rod is pivotally connected to the first connection block on the outer side wall of the upper sleeve through a pin shaft. The lower end of the Z-shaped rod is connected to the sliding groove opened in the lower part of the inner side of the supporting arm through a pin shaft. The lower end of the Z-shaped rod can move up and down in the sliding groove driven by the pin shaft. The top end of the first rod at the upper end of the three-link rod is pivotally connected to the second connection block on the upper part of the inner side of the supporting arm through a pin shaft. The lower end of the third rod at the lower part of the three-link rod is pivotally connected to the third connection block on the outer side wall of the lower sleeve through a pin shaft. During the up and down movement of the lower sleeve, it drives the supporting arms to expand and contract through the brackets.

5. The shear support eccentric wedge for ice layer directional drilling according to claim 1, characterized in that: The described control mechanism includes a magnetic controller, a signal input module, a signal processing module, and a signal output module. Among them, the signal input module is connected to the signal processing module, and the signal processing module is connected to the signal output module. The signal input module can transmit the received data to the signal processing module in real time for processing. The signal processing module processes the received data and sends it to the signal output module for external transmission. The signal input module is connected to the connector through the magnetic controller, and the signal input module can receive the signal transmitted by the connector. The signal output module is also connected to the drive motor. The signal output module provides a working instruction for the drive motor to control the expansion and contraction of the support arm. The signal output module is also connected to the heating wire. When the eccentric wedge is withdrawn, the signal is transmitted to the heating wire through the signal output module, causing the heating wire to melt the hole wall and detach the support arm from the hole wall. After the lifting is completed, the signal output module instructs the heating wire to stop working, and the eccentric wedge is withdrawn.

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