Electrically powered downhole jarring device

Abstract

The application relates to the technical field of downhole pushing devices, and discloses an electric downhole pushing device which comprises an outer cylinder, a rotating shaft and an electric active combination block. The rotating shaft is sleeved with the outer cylinder. At least two mounting holes which are internally and externally penetrated are uniformly distributed in the middle of the outer cylinder. An electric active combination block which can be retracted or expanded by on-off electricity is arranged in each mounting hole. The electric downhole pushing device has reasonable and compact structure and is convenient to use. The pure electric electric active combination block pushing force device which does not need hydraulic pressure is arranged, the problems of high-temperature and high-vibration working conditions of the hydraulic pushing device are solved, the electric downhole pushing device can be applied to static pushing type vertical drilling, rotary steering and other tools, can meet the requirements of deep well and ultra-deep well anti-inclination and steering drilling, and has the characteristics of not being limited by temperature, not being affected by vibration, stable output force, few components and release of mechanical structure compression design size.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole pushing device, and is an electric downhole pushing device. BACKGROUND

[0002] With the development of deep well and ultra-deep well drilling technology, downhole conditions such as temperature, pressure and formation are becoming more and more complex. The temperature reaches more than 200 DEG C, the pressure exceeds 200 MPa, and the vibration is more intense during drilling due to the influence of formation compaction, which puts forward new technical requirements for vertical drilling tools. The current vertical drilling tools mainly include full rotation type and static pushing type. Since the static pushing type uses a hydraulic pushing device, it is seriously affected by temperature and other factors. The static pushing type works downhole, generates pressure through three hydraulic pushing devices, and realizes deviation prevention. During drilling, the pushing device does not rotate, and the central shaft rotates. The downhole pushing force device is an important working component of the vertical drilling tool, which generates downhole pushing force and realizes downhole closed-loop deviation prevention. The working performance of the downhole pushing force device plays a crucial role in whether the deviation prevention of the vertical drilling tool can be effectively exerted. At present, the downhole pushing force device used in the static pushing type vertical drilling tool is based on the small hole throttling or electromagnetic valve control principle, and the hydraulic pressure is generated by controlling the micro pump with a micro motor to realize the output of downhole pushing force. However, due to the increase of downhole temperature, the viscosity and other properties of hydraulic oil are affected by high temperature, and the stable output of hydraulic system pushing force appears temperature attenuation problem. And with the intensification of downhole pressure, vibration and other factors, the mechanical structure of the pushing device cannot meet the field requirements in terms of pressure resistance and wear resistance. SUMMARY

[0003] The present application provides an electric downhole pushing device, which overcomes the shortcomings of the prior art and effectively solves the problem of pushing force attenuation of the existing hydraulic pushing system affected by high downhole temperature.

[0004] The technical scheme of the present application is realized by the following measures: an electric downhole pushing device, comprising an outer cylinder, a rotating shaft and an electric active combination block, the rotating shaft is sleeved with the outer cylinder, the outer cylinder is uniformly distributed with at least two inner and outer through holes in the middle part along the circumference, and each installation hole is provided with an electric active combination block capable of retracting or expanding by on-off electricity.

[0005] The following is a further optimization or / and improvement of the above-mentioned technical scheme of the application:

[0006] The above-mentioned electric active combination block can be an electric active material, which is longitudinally stacked by a whole piece of electric active material, and the two ends of the electric active combination block are respectively connected with positive and negative electrodes of a power supply.

[0007] The above may also include an electronic compartment, with an electronic compartment located inside an outer cylinder fitted on the upper outer side of the rotating shaft. The electronic compartment is equipped with a measurement and control circuit, which includes an inclination sensor and a control circuit. The inclination sensor is connected to the control circuit. The ends of the wires at both ends of the electroactive assembly block are connected to sealing sleeves. The control circuit is connected to the electroactive assembly block by inserting a high-voltage sealing pin into the sealing sleeve.

[0008] The above may also include sealing rings, with sealing rings provided between the upper outer side and the lower outer side of the electronic compartment and the outer cylinder.

[0009] The above may also include a grounding screw, which is provided inside the electronic compartment, and the control circuit is connected to the grounding screw.

[0010] The above may also include a push plate and a fixing block. Each electroactive assembly block is provided with a push plate on its outer side. The push plate is U-shaped with the opening facing inward. The upper end and the lower end of the inner side of the push plate are respectively provided with an upper slide and a lower slide. The inner side of the outer cylinder corresponding to the position of the upper slide is provided with a slide groove. The upper slide is located in the slide groove. The fixing block is installed on the outer cylinder corresponding to the lower end of the mounting hole by bolts. The lower slide is located in the fixing block.

[0011] This invention has a reasonable and compact structure and is easy to use. By setting up a pure electric electroactive combined block pushing force device that does not require hydraulic pressure, it solves the problem of adapting to working conditions such as ultra-high temperature and high vibration of hydraulic pushing devices. It can be applied to tools such as static pushing vertical drilling and rotary guide, and is suitable for the anti-deviation and directional drilling needs of deep and ultra-deep wells. It has the characteristics of not being limited by temperature, not being affected by vibration, stable output force, fewer parts, and pressure-resistant design size of the release mechanical structure. Attached Figure Description

[0012] Appendix Figure 1 This is a schematic diagram of the front half-section structure according to an embodiment of the present invention.

[0013] Appendix Figure 2 For the appendix Figure 1 The schematic diagram of the cross-sectional structure at point AA.

[0014] Appendix Figure 3 For the appendix Figure 1 A schematic diagram of the cross-sectional structure at BB.

[0015] The codes in the attached diagram are as follows: 1 is the outer cylinder, 2 is the rotating shaft, 3 is the electroactive assembly block, 4 is the electronic compartment, 5 is the measurement and control circuit, 6 is the sealing sleeve, 7 is the high-voltage sealing pin, 8 is the sealing ring, 9 is the grounding screw, 10 is the push plate, 11 is the fixing block, 12 is the upper slide, 13 is the lower slide, 14 is the slide groove, and 15 is the bolt. Detailed Implementation

[0016] The present application is not limited to the following examples, and the specific implementation can be determined according to the technical solutions of the present application and the actual situation.

[0017] In the present application, the relative position relationship of each component is described according to the layout of the accompanying drawings, such as the position relationship of front, back, up, down, left, right, etc. Figure 1

[0018] The present application will be further described below in conjunction with examples and drawings:

[0019] Example 1: as shown in the accompanying drawings Figure 1 , 2 , 3, the electric downhole pushing device includes an outer cylinder 1, a rotating shaft 2 and an electroactive composite block 3, the rotating shaft 2 is sleeved with the outer cylinder 1, and the middle part of the outer cylinder 1 is uniformly distributed with at least two through mounting holes, and each mounting hole is provided with an electroactive composite block 3 capable of being retracted or expanded by switching on and off the power.

[0020] According to the need, the electroactive composite block 3 uses the existing known material, and switching on and off the power can make it deform, so as to serve as an actuator.

[0021] According to the need, the middle part of the outer cylinder 1 is uniformly distributed with three through mounting holes.

[0022] In use, the electroactive composite block 3 is retracted or expanded by switching on and off the power, the electroactive composite block 3 is retracted when going down the well, and the three groups of electroactive composite blocks 3 are expanded to resist the well wall when the pipe string needs to be righted in the well, the pipe string moves to the position with small force, the outer cylinder 1 is pushed to be centered, so as to adjust the position of the drill bit below the rotating shaft, and prevent the well deviation. The present application uses a new material applied to the pushing device, relies on electric control to realize the deformation of the electroactive composite block 3 to generate pushing force, fundamentally solves the problem of pushing force attenuation caused by the influence of high temperature on the hydraulic system, is not affected by temperature, vibration, etc., and can completely adapt to the high temperature and high vibration environment of ultra-deep well drilling. At the same time, the installation space is saved due to the reduction of the installation components, and the problem of ultra-high pressure in mechanical structure design is solved.

[0023] According to the actual need, the above-mentioned electric downhole pushing device can be further optimized or / and improved:

[0024] Example 2: as shown in the accompanying drawings Figure 1 , 2 ​As shown, the electroactive combination block 3 is an electroactive material, which is longitudinally stacked by whole electroactive material, and the two ends of the electroactive combination block 3 are connected to the positive and negative poles of the power supply. In use, after the electroactive material is powered on, the positive and negative poles attract each other, causing the stacked electroactive material to compress, and after the power is turned off, the stacked electroactive material returns to its original state, thereby expanding outward. When it is necessary to ensure the central position of the vertical drilling tool in the well, the electroactive material is powered off, and when the pushing force is not needed, the electroactive material is powered on to retract.

[0025] Embodiment 3: as shown in the accompanying Figure 1 , 2 , the electronic warehouse 4 is further included, the upper outer side of the rotating shaft 2 is sleeved with the electronic warehouse 4 located in the outer barrel 1, the electronic warehouse 4 is provided with a measurement and control circuit 5, the measurement and control circuit 5 includes an inclinometer sensor and a control circuit, the inclinometer sensor is connected with the control circuit, the two ends of the electroactive combination block 3 are connected with the sealing rubber sleeve 6 at the end of the wire, and the control circuit is connected with the electroactive combination block 3 through the high-voltage sealing needle 7 inserted into the sealing rubber sleeve 6.

[0026] In use, the inclinometer sensor is used to monitor the inclination of the pipe string, and when the control system determines that the monitoring data of the inclinometer sensor exceeds the specified value, the electroactive combination block 3 is powered off to expand and push the outer barrel 1 to the center.

[0027] Embodiment 4: as shown in the accompanying Figure 1 , 2 , the sealing ring 8 is further included, and the upper outer side and the lower outer side of the electronic warehouse 4 are provided with the sealing ring 8 between the outer barrel 1.

[0028] The sealing ring 8 is arranged to prevent impurities from entering the electronic warehouse 4.

[0029] Embodiment 5: as shown in the accompanying Figure 1 , 2 , the ground screw 9 is further included, and the electronic warehouse 4 is provided with the ground screw 9, and the control circuit is connected with the ground screw 9.

[0030] The ground screw 9 ensures the safety and normal operation of the equipment.

[0031] Embodiment 6: as shown in the accompanying Figure 1 , 2 , 3, the pushing plate 10 and the fixing block 11 are further included, the outer side of each electroactive combination block 3 is provided with the pushing plate 10, the pushing plate 10 is in the shape of a V with an opening inward, the inner side upper end and the inner side lower end of the pushing plate 10 are integrally provided with the upper sliding table 12 and the lower sliding table 13 respectively, the inner side of the outer barrel 1 corresponding to the position of the upper sliding table 12 is provided with the sliding groove 14, the upper sliding table 12 is located in the sliding groove 14, and the outer barrel 1 corresponding to the lower end position of the mounting hole is provided with the fixing block 11 through the bolt 15, and the lower sliding table 13 is located in the fixing block 11.

[0032] The pushing plate 10 is used to avoid the abrasion caused by the contact between the electroactive combination block 3 and the well wall, and the pushing plate 10 can be pushed outward by the electroactive combination block 3, and when the pushing plate 10 moves outward, the upper sliding table 12 moves outward along the sliding groove 14, and the lower sliding table 13 moves outward along the fixed block 11.

[0033] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. An electrically powered downhole pushing device, characterized in that... It includes an outer cylinder, a rotating shaft, and an electroactive assembly block. The outer cylinder is fitted on the outside of the rotating shaft. At least two through mounting holes are evenly distributed around the circumference of the outer cylinder. Each mounting hole is equipped with an electroactive assembly block that can retract or expand when the power is turned on or off. The electroactive assembly block is an electroactive material, which is formed by stacking layers of a whole electroactive material vertically. The two ends of the electroactive assembly block are connected to the positive and negative terminals of the power supply, respectively. It also includes an electronic compartment. An electronic compartment located inside the outer cylinder is fitted on the upper outer side of the rotating shaft. The electronic compartment is equipped with a measurement and control circuit, which includes a tilt sensor and a control circuit. The tilt sensor is connected to the control circuit. The ends of the wires at both ends of the electroactive assembly block are connected to a sealing sleeve. The control circuit is connected to the electroactive assembly block through a high-voltage sealing pin inserted into the sealing sleeve. It also includes a push plate and a fixing block. Each electroactive assembly block has a push plate on its outer side. The push plate is U-shaped with the opening facing inward. The upper and lower inner ends of the push plate are respectively integrally provided with an upper slide and a lower slide. The inner side of the outer cylinder corresponding to the position of the upper slide is provided with a slide groove. The upper slide is located in the slide groove. The fixing block is installed on the outer cylinder corresponding to the lower end of the mounting hole by bolts. The lower slide is located in the fixing block.

2. The electrically powered downhole pushing device according to claim 1, characterized in that... It also includes sealing rings, with sealing rings installed between the upper outer side and the lower outer side of the electronic compartment and the outer cylinder.

3. The electrically powered downhole pushing device according to claim 1 or 2, characterized in that... It also includes a grounding screw, which is installed inside the electronic compartment and is connected to the control circuit.

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