Electric underground pushing device

Abstract

The invention relates to the technical field of underground pushing devices, in particular to an electric underground pushing device which comprises an outer cylinder, a rotating shaft and an electroactive combination block, the outer cylinder is sleeved on the outer side of the rotating shaft, and at least two mounting holes which are through inside and outside are evenly distributed in the middle of the outer cylinder along the circumference. And each mounting hole is internally provided with an electroactive combination block which can retract or expand when powered on or powered off. The electro-active combined block pushing force device is reasonable and compact in structure and convenient to use, solves the problem that a hydraulic pushing device adapts to working conditions such as ultrahigh temperature and high vibration by arranging a pure electric electro-active combined block pushing force device which does not need hydraulic pressure, can be applied to static pushing type vertical drilling tools, rotary guiding tools and the like, and has wide application prospects. The deep well and ultra-deep well deviation preventing and guiding drilling device has the advantages of being not limited by temperature and not affected by vibration, stable in output force, small in number of components and capable of releasing the mechanical structure pressure-resistant design size.

Description

Technical Field

[0001] The invention relates to the technical field of underground pushing and leaning devices, in particular to an electric underground pushing and leaning device. Background Art

[0002] With the development of deep and ultra-deep well drilling technology, downhole working conditions such as downhole temperature, pressure, and formation are becoming increasingly complex. When the temperature reaches above 200°C and the pressure exceeds 200MPa, the vibration during drilling becomes more severe due to the compaction of the formation, which puts forward new technical requirements for vertical drilling tools. At present, vertical drilling tools mainly include full-rotation type and static push-and-leave type. Since the static push-and-leave type uses a hydraulic push-and-leave device, it is seriously affected by temperature and other factors. The static push-and-leave type works underground and generates pressure through three hydraulic push-and-leave devices to achieve anti-deflection. During the drilling process, the push-and-leave device does not rotate, but the central axis rotates. As an important working component of vertical drilling tools to generate downhole push-and-leave force and realize downhole closed-loop anti-deflection, the working performance of the downhole push-and-leave device plays a vital role in whether the vertical drilling tool can effectively play its anti-deflection role. At present, the downhole push-and-leave force device used in static push-and-leave vertical drilling tools is based on the principle of small hole throttling or solenoid valve control. The hydraulic pressure is generated by the micro-motor to control the micro-pump to achieve the output of downhole push-and-leave force. However, due to the increase in underground temperature, the viscosity and other properties of the hydraulic oil are affected by high temperature, and the stable output of the hydraulic system's pushing force has a temperature attenuation problem. And as the underground pressure and vibration increase, the mechanical structure of the pushing device cannot meet the needs of the site in terms of pressure resistance and wear resistance. Summary of the invention

[0003] The present invention provides an electric downhole pushing device, which overcomes the above-mentioned shortcomings of the prior art and can effectively solve the problem of the pushing force attenuation of the existing hydraulic pushing system due to the high temperature downhole.

[0004] The technical solution of the present invention is achieved through the following measures: an electric downhole pushing device, including an outer cylinder, a rotating shaft and an electro-active combination block, the outer cylinder is mounted on the outer side of the rotating shaft, and at least two mounting holes that penetrate inside and outside are evenly distributed along the circumference in the middle of the outer cylinder, and each mounting hole is provided with an electro-active combination block that can retract or expand when the power is turned on or off.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned electroactive assembly block can be an electroactive material, which is formed by stacking whole sheets of electroactive material in layers vertically, and the two ends of the electroactive assembly block are respectively connected to the positive and negative electrodes of the power supply.

[0006] The above may further include an electronic bin. An electronic bin located inside the outer cylinder is sleeved on the outer side of the upper part of the rotating shaft. A measurement and control circuit is provided inside the electronic bin. The measurement and control circuit includes an inclinometer sensor and a control circuit. The inclinometer sensor is connected to the control circuit. Sealing rubber sleeves are connected to the ends of the wires at both ends of the electro-active combination block. The control circuit is connected to the electro-active combination block by inserting a high-voltage sealed pin into the sealing rubber sleeve.

[0007] The above may further include sealing rings. Sealing rings are provided between the outer sides of the upper and lower parts of the electronic bin and the outer cylinder.

[0008] The above may further include a ground wire screw. A ground wire screw is provided inside the electronic bin, and the control circuit is connected to the ground wire screw.

[0009] The above may further include a pushing plate and a fixing block. A pushing plate is provided on the outer side of each electro-active combination block. The pushing plate is in a U shape with an opening facing inwards. An upper sliding table and a lower sliding table are integrally provided at the upper and lower inner ends of the pushing plate respectively. A sliding groove is provided on the inner side of the outer cylinder corresponding to the position of the upper sliding table, and the upper sliding table is located in the sliding groove. A fixing block is installed on the outer cylinder corresponding to the lower end of the installation hole through a bolt, and the lower sliding table is located inside the fixing block.

[0010] The structure of the present invention is reasonable and compact, and it is convenient to use. By setting a pure electric electro-active combination block pushing force device that does not require hydraulic pressure, the problems of adapting to working conditions such as ultra-high temperature and high vibration existing in the hydraulic pushing device are solved. It can be applied to tools such as static pushing vertical drilling and rotary steering, and meets the requirements of anti-deviation and steering drilling in deep wells and ultra-deep wells. It has the characteristics of being not limited by temperature, not affected by vibration, stable output force, few components, and releasing the compressive design size of the mechanical structure. Description of the Drawings

[0011] Att Figure 1 is a schematic half-sectional view of the main view of an embodiment of the present invention.

[0012] Att Figure 2 is the schematic sectional view at A-A in Att Figure 1 in.

[0013] Att Figure 3 is the schematic sectional view at B-B in Att Figure 1 in.

[0014] The codes in the drawings are respectively: 1 is the outer cylinder, 2 is the rotating shaft, 3 is the electro-active combination block, 4 is the electronic bin, 5 is the measurement and control circuit, 6 is the sealing rubber sleeve, 7 is the high-voltage sealed pin, 8 is the sealing ring, 9 is the ground wire screw, 10 is the pushing plate, 11 is the fixing block, 12 is the upper sliding table, 13 is the lower sliding table, 14 is the sliding groove, and 15 is the bolt. Detailed Embodiments

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2 As shown in Figure 3, the electric downhole pushing device includes an outer cylinder 1, a rotating shaft 2 and an electro-active assembly block 3. The outer cylinder 1 is mounted on the outer side of the rotating shaft 2. The middle part of the outer cylinder 1 has at least two mounting holes that penetrate inside and outside evenly distributed along the circumference. Each mounting hole is provided with an electro-active assembly block 3 that can retract or expand when the power is turned on or off.

[0018] As required, the electroactive assembly block 3 is made of existing well-known materials, and can be deformed by turning on and off the power, so that it can be used as an actuator.

[0019] As required, three mounting holes are evenly distributed along the circumference in the middle of the outer cylinder 1 and penetrate the inside and outside.

[0020] When in use, the electroactive assembly block 3 is retracted or expanded by turning the power on and off. When going down the well, the electroactive assembly block 3 is retracted. When the pipe string needs to be straightened to prevent deflection in the well, the three groups of electroactive assembly blocks 3 are expanded to hold up the well wall, and the pipe string moves to a position with less force, pushing the outer cylinder 1 to make it centered, thereby adjusting the position of the drill bit below the rotating shaft to prevent well deflection. The present invention uses a new material applied to the pushing device, and relies on electric control to realize the deformation of the electroactive assembly block 3 to generate a pushing force, which fundamentally solves the problem of the hydraulic system being affected by high temperature and causing the pushing force to attenuate. It is not affected by temperature, vibration, etc., and can fully adapt to the high temperature and high vibration environment of ultra-deep well drilling. At the same time, due to the reduction of installation components and the saving of installation space, the ultra-high pressure problem faced by the mechanical structure design is solved.

[0021] The above-mentioned electric downhole pushing device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2As shown, the electroactive combined block 3 is made of electroactive material, which is longitudinally stacked layer by layer from a whole piece of electroactive material. The two ends of the electroactive combined block 3 are respectively connected to the positive and negative electrodes of the power supply. When in use, after the electroactive material is energized, the positive and negative electrodes attract each other, causing the stacked electroactive material to be compressed. After power-off, the stacked electroactive material returns to its original state and expands outward. When it is necessary to ensure the centered position of the vertical drilling tool in the well, the electroactive material is powered off, and when no pushing force is required, it is energized to retract.

[0022] Embodiment 3: As shown in the appendix Figure 1 and 2 As shown, it further includes an electronic bin 4. An electronic bin 4 located inside the outer cylinder 1 is sleeved on the outer side of the upper part of the rotating shaft 2. A measurement and control circuit 5 is provided inside the electronic bin 4. The measurement and control circuit 5 includes an inclinometer sensor and a control circuit. The inclinometer sensor is connected to the control circuit. The ends of the wires at both ends of the electroactive combined block 3 are connected with a sealing rubber sleeve 6. The control circuit is connected to the electroactive combined block 3 by inserting a high-voltage sealed pin 7 into the sealing rubber sleeve 6.

[0023] When in use, the inclination of the pipe string is monitored by the inclinometer sensor. When the control system determines that the monitoring data of the inclinometer sensor exceeds the specified value, it controls the electroactive combined block 3 to power off and expand, pushing the outer cylinder 1 to be centered.

[0024] Embodiment 4: As shown in the appendix Figure 1 and 2 As shown, it further includes a sealing ring 8. Sealing rings 8 are provided between the outer sides of the upper part and the lower part of the electronic bin 4 and the outer cylinder 1.

[0025] By providing the sealing ring 8, underground impurities are prevented from entering the electronic bin 4.

[0026] Embodiment 5: As shown in the appendix Figure 1 and 2 As shown, it further includes a ground wire screw 9. A ground wire screw 9 is provided inside the electronic bin 4, and the control circuit is connected to the ground wire screw 9.

[0027] The ground wire screw 9 ensures the safety and normal operation of the equipment.

[0028] Embodiment 6: As shown in the appendix Figure 1 and 2 As shown in FIG. 3, it further includes a pushing plate 10 and a fixing block 11. A pushing plate 10 is provided on the outer side of each electroactive combined block 3. The pushing plate 10 is in a U shape with an opening inward. An upper sliding table 12 and a lower sliding table 13 are integrally provided at the upper end and the lower end of the inner side of the pushing plate 10 respectively. A sliding groove 14 is provided on the inner side of the outer cylinder 1 corresponding to the position of the upper sliding table 12, and the upper sliding table 12 is located in the sliding groove 14. A fixing block 11 is installed on the outer cylinder 1 corresponding to the lower end of the installation hole through a bolt 15, and the lower sliding table 13 is located inside the fixing block 11.

[0029] The function of the push plate 10 is to prevent the electroactive assembly block 3 from contacting and abrading the well wall. The push plate 10 can be pushed outward by the electroactive assembly block 3 to expand. When the push plate 10 moves outward, the upper slide 12 moves outward along the slide groove 14, and the lower slide 13 moves outward along the fixed block 11.

[0030] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An electric downhole pushing device, characterized in that It includes an outer cylinder, a rotating shaft and electroactive composite blocks. The outer cylinder is sleeved outside the rotating shaft. At least two through holes penetrating inside and outside are evenly distributed along the circumference in the middle of the outer cylinder, and an electroactive composite block capable of retracting or expanding when powered on and off is arranged in each through hole.

2. The electric downhole pushing device according to claim 1 is characterized in that The electroactive composite block is an electroactive material, which is longitudinally stacked layer by layer from a whole piece of electroactive material. The positive and negative electrodes of the power supply are respectively connected to both ends of the electroactive composite block.

3. The electric downhole pushing device according to claim 1 or 2, characterized in that It further includes an electronic chamber. The electronic chamber located inside the outer cylinder is sleeved outside the upper part of the rotating shaft. A measurement and control circuit is arranged in the electronic chamber. The measurement and control circuit includes an inclinometer sensor and a control circuit. The inclinometer sensor is connected to the control circuit. Sealing rubber sleeves are connected to the ends of the wires at both ends of the electroactive composite block, and the control circuit is connected to the electroactive composite block by inserting a high-voltage sealed pin into the sealing rubber sleeve.

4. The electric downhole pushing device according to claim 3 is characterized in that It further includes sealing rings. Sealing rings are arranged between the outer sides of the upper and lower parts of the electronic chamber and the outer cylinder.

5. The electric downhole pushing device according to claim 3 is characterized in that It further includes a ground wire screw. A ground wire screw is arranged in the electronic chamber, and the control circuit is connected to the ground wire screw.

6. The electric downhole pushing device according to claim 4 is characterized in that It further includes a ground wire screw. A ground wire screw is arranged in the electronic chamber, and the control circuit is connected to the ground wire screw.

7. The electric downhole pushing device according to claim 1, 2, 4, 5 or 6, characterized in that It further includes a pushing plate and a fixing block. A pushing plate is arranged outside each electroactive composite block. The pushing plate is in a U shape with an opening inward. An upper sliding table and a lower sliding table are integrally arranged at the upper end and the lower end of the inner side of the pushing plate respectively. A sliding groove is arranged on the inner side of the outer cylinder corresponding to the position of the upper sliding table, and the upper sliding table is located in the sliding groove. A fixing block is installed on the outer cylinder corresponding to the lower end position of the through hole by a bolt, and the lower sliding table is located in the fixing block.

8. The electric downhole pushing device according to claim 3 is characterized in that It further includes a pushing plate and a fixing block. A pushing plate is arranged outside each electroactive composite block. The pushing plate is in a U shape with an opening inward. An upper sliding table and a lower sliding table are integrally arranged at the upper end and the lower end of the inner side of the pushing plate respectively. A sliding groove is arranged on the inner side of the outer cylinder corresponding to the position of the upper sliding table, and the upper sliding table is located in the sliding groove. A fixing block is installed on the outer cylinder corresponding to the lower end position of the through hole by a bolt, and the lower sliding table is located in the fixing block.

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