Electric drilling device, drilling system and drilling method for ultra-deep wells

Abstract

The present invention provides an electric drilling device, a drilling system and a drilling method, wherein the electric drilling device comprises: an outer shell provided with a reserved channel; a fixing member provided on the outer shell; an inner core rotatably provided in the outer shell, the inner core provided with a steering channel; and a walking drill capable of sliding in the reserved channel and the steering channel; wherein, when the electric drilling device is lowered to a preset well depth, the fixing member is actuated to fix the outer shell on the well wall, and the steering position of the steering channel is adjusted by rotating the inner core to ensure that the walking drill can align with the target drilling point when at the exit position of the reserved channel. Based on the technical solution of the present invention, the steering position of the steering channel is adjusted by rotating the inner core to select different circumferential directions of the same preset well depth as side drilling points, thereby ensuring that the angle between the initial side drilling direction of the electric drilling device and the radial direction of the target target point is 0 or minimum. In this way, only fine-tuning is required for the walking drill in the future, saving time and cost.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well drilling, and in particular to an electric drilling device, a drilling system and a drilling method for ultra-deep wells. Background Art

[0002] In recent years, major onshore oil and gas discoveries in my country have been located in fractured and fracture-vuggy carbonate reservoirs at depths exceeding 7,000 meters in the northwest region. Due to current production and development technologies, the majority of ultra-deep oil and gas wells exceeding 7,000 meters are single-bore wells, primarily completed using open-hole methods.

[0003] Due to the limitations of current geophysical exploration technology, for fracture-cavity carbonate reservoirs, the current fracture-cavity identification technology can identify large fractures and caves in ultra-deep reservoirs, but it cannot determine whether the fractures and caves in the reservoir are crude oil or pure water. Ultimately, it is necessary to communicate with the fractures and caves through drilling or fracturing to communicate with the fracture-cavity identification in order to obtain oil and gas production. A major problem is that after a certain period of production, when the oil and gas resources in the main fractures and caves are exploited to the point where they cannot be recovered, the production of a single well will be exhausted. Because the construction cost of ultra-deep oil and gas wells is very high, the cost of drilling is very high. It costs up to RMB 100-200 million. If a single well is exhausted after 3-5 years of production, in terms of comprehensive cost utilization and benefit maximization, it is necessary to side-drill the old wellbore to connect to the new reservoir space to obtain subsequent new oil and gas production. Usually, ultra-deep well drilling rigs are needed. Whether it is side-drilling with casing windows or side-drilling with open hole wellbore, it is difficult. In addition, due to the depth of the well, the drilling time is long, the drilling fluid is easy to leak, the cost of side-drilling a branch is high, and there are also uncertainties such as whether the fractures encountered are empty fractures or full of water fractures, resulting in high overall costs.

[0004] In other words, the drilling equipment in the related art has the problems of long drilling time and high cost. Summary of the Invention

[0005] In response to the above-mentioned problems in the prior art, the present application proposes an electric drilling device, a drilling system and a drilling method for ultra-deep wells, which solve the problems of long drilling time and high cost of drilling equipment.

[0006] The electric drilling device for ultra-deep wells of the present invention comprises: an outer shell provided with a reserved channel; a fixing member provided on the outer shell; an inner core rotatably provided in the outer shell, the inner core provided with a steering channel; and a traveling drill capable of moving within the reserved channel and the steering channel. When the electric drilling device is lowered to a preset well depth, the fixing member is actuated to fix the outer shell to the well wall, and the steering position of the steering channel is adjusted by rotating the inner core to ensure that the traveling drill can align with the target drilling point when it moves to the exit position of the reserved channel.

[0007] In one embodiment, the fixing member includes a plurality of fixing rods, which have the functions of opening and retracting. When the fixing rods are opened, one end thereof is pressed against the well wall. When the fixing rods are retracted, the fixing rods do not contact the well wall.

[0008] In one embodiment, the reserved channel is an open groove opened along the circumference of the shell.

[0009] In one embodiment, the length of the open slot is ¾ of the circumference of the housing.

[0010] In one embodiment, the diverting channel includes: an axial channel; a curved channel, one end of which is connected to the axial channel and the other end of which can be connected to the reserved channel; the curved channel can divert the axial movement of the traveling drilling rig along the wellbore into radial movement.

[0011] In one embodiment, the walking drilling rig includes a drilling assembly and a guide crawler assembly connected to the drilling assembly.

[0012] In one embodiment, the drilling assembly includes: a drill bit; a rotary drive connected to the drill bit; and a weight-on-bit applicator connected to the drill bit.

[0013] In one embodiment, the drilling pressure applying component includes: a piston outer core shaft, connected to the drill bit; a piston inner core shaft, slidingly connected to the piston outer core shaft; and an electrically controlled piston, arranged on the outer periphery of the piston inner core shaft; wherein the electrically controlled piston is energized to drive the piston outer core shaft to move axially.

[0014] In one embodiment, the guide crawling assembly includes: a piston outer cylinder, which is slidably connected to the piston outer core shaft; a positioning and direction adjustment structure, which is arranged on the outer periphery of the piston outer cylinder; and a crawling structure, which is arranged on the outer periphery of the piston outer cylinder and is spaced apart from the positioning and direction adjustment structure.

[0015] In one embodiment, the positioning and direction adjustment structure includes a plurality of telescopic direction adjustment rods arranged at intervals along the circumference of the piston outer cylinder.

[0016] In one embodiment, the crawling structure includes a plurality of telescopic crawling teeth spaced apart along the circumference of the piston outer cylinder.

[0017] In one embodiment, the drilling pressure application component also includes: an upper contact and power supply joint, which is arranged on the outer cylinder of the piston; a lower contact and power supply joint, which is arranged on the outer core shaft of the piston; and a contact and power supply wire, one end of which is connected to the upper contact and power supply joint, and the other end is magnetically bonded to the lower contact and power supply joint.

[0018] The present invention also provides a drilling system, comprising: a ground control device; the above-mentioned electric drilling device; and a steel cable optical fiber bundle, one end of which is connected to the ground control device and the other end is connected to the electric drilling device.

[0019] The present invention also provides a drilling method, which uses the above-mentioned electric drilling device and includes the following steps:

[0020] Step S1, lowering the electric drilling device to a preset well depth;

[0021] Step S2, fixing the housing to the well wall using a fixing member;

[0022] Step S3, rotating the inner core to adjust the steering position of the steering channel;

[0023] Step S4: Align the traveling drill with the target point to be drilled.

[0024] Step S5: Drilling with a traveling drilling rig.

[0025] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0026] The electric drilling device, drilling system and drilling method for ultra-deep wells provided by the present invention have at least the following beneficial effects compared with the prior art:

[0027] By rotating the inner core to adjust the steering position of the steering channel, different circumferential directions of the same preset well depth can be selected as sidetracking points, thereby ensuring that the angle between the initial sidetracking drilling direction of the electric drilling device and the radial direction of the target target point is 0 or minimum. In this way, only fine-tuning of the drill bit of the traveling drill rig is required to ensure that the traveling drill bit drills to the target target point according to the preset wellbore trajectory. This reduces the amount of adjustment of the drill bit's drilling direction, saves drilling time and cost, and thus improves the drilling efficiency of the electric drilling device. After drilling a small sidetracking wellbore, the main body of the electric-controlled drilling device can be driven to change the well depth position by lifting or lowering the cable, thereby realizing the drilling of new sidetracking wellbores in different layers and sections. It has the function of drilling multiple sidetracking wellbores in one wellbore, further saving drilling time and cost, and improving the drilling efficiency of the electric drilling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0029] Figure 1 Shown is a schematic structural diagram of an electric drilling device for ultra-deep wells in the first embodiment of the present invention;

[0030] Figure 2 Shows Figure 1 A cross-sectional view of the traveling drilling rig (showing the steering channel);

[0031] Figure 3 A schematic structural diagram of an electric drilling system in a second embodiment of the present invention is shown;

[0032] Figure 4 A flow chart of the drilling method in the third embodiment of the present invention is shown.

[0033] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0034] Reference numerals:

[0035] 10. Housing; 11. Reserved channel; 20. Fixing member; 21. Fixing rod; 30. Inner core; 31. Steering channel; 311. Axial channel; 312. Curved channel; 40. Traveling drill; 41. Drilling assembly; 411. Drill bit; 412. Rotary drive member; 413. WOB application member; 4131. Piston outer mandrel; 4132. Piston inner mandrel; 4133. Electric piston; 4134. Contact energizing upper connector; 4135. Contact energizing Lower joint; 4136, contact wire; 4137, sliding hole; 414, rotating turbine; 42, guide crawling assembly; 421, piston outer cylinder; 422, positioning and direction adjustment structure; 4221, telescopic direction adjustment rod; 423, crawling structure; 4231, telescopic crawling teeth; 100, electric drilling device; 200, well wall; 300, ground control device; 400, steel wire cable fiber optic bundle; 401, transmission cable fiber optic bundle; 402, stretchable cable. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Example 1

[0038] like Figure 1 and Figure 2 As shown, the present invention provides an electric drilling device 100 for ultra-deep wells, comprising a housing 10, a fixing member 20, an inner core 30, and a traveling drill rig 40. The housing 10 is provided with a reserved channel 11; the fixing member 20 is mounted on the housing 10; the inner core 30 is rotatably mounted within the housing 10 and is provided with a steering channel 31; the traveling drill rig 40 is capable of moving within the reserved channel 11 and the steering channel 31. When the electric drilling device 100 is lowered to a predetermined well depth, the fixing member 20 is actuated to secure the housing 10 to the well wall 200. The steering position of the steering channel 31 is adjusted by rotating the inner core 30 to ensure that the traveling drill rig 40 is aligned with the target drilling point when it reaches the exit of the reserved channel 11.

[0039] In the above arrangement, the steering position of the steering channel 31 is adjusted by rotating the inner core 30 to select different circumferential directions within the same preset well depth as sidetracking points, thereby ensuring that the angle between the initial sidetracking drilling direction of the electric drilling device 100 and the radial direction of the target point is zero or minimal. This allows only fine-tuning of the drill bit 411 of the traveling drilling rig 40 to ensure that the traveling drill bit 411 drills to the target point according to the preset wellbore trajectory. This reduces the amount of adjustment required for the drilling direction of the drill bit 411, saving drilling time and cost, and thereby improving the drilling efficiency of the electric drilling device 100. After drilling a small sidetracking wellbore, the main body of the electric drilling device 100 can be driven to change its well depth by raising or lowering the cable, enabling the drilling of new sidetracking wellbores in different layers and sections. This allows the drilling of multiple sidetracking wellbores from a single wellbore, further saving drilling time and cost and improving the drilling efficiency of the electric drilling device 100.

[0040] It should be noted that the reserved channel 11 and the steering channel 31 constitute a guide channel, which can guide the walking drilling rig 40 to align with the side drilling point.

[0041] It should be noted that the electric drilling device 100 in the related art adjusts the drilling direction of the drill bit 411 to ensure that the drill bit 411 drills in the direction of the preset wellbore trajectory. However, the present application adjusts the steering position of the steering channel 31 by rotating the inner core 30 to align the steering channel 31 with the sidetracking point. In this way, when the traveling drilling rig 40 moves to the exit position of the reserved channel 11, its drill bit 411 can be aligned with the target drilling point. That is, the angle between the initial sidetracking drilling direction of the electric drilling device 100 and the radial direction of the target point is 0 or minimum, thereby reducing the adjustment amount of the drilling direction of the drill bit 411 and improving the drilling efficiency of the electric drilling device 100.

[0042] Specifically, if Figure 1 As shown, in one embodiment, the fixing member 20 includes multiple fixing rods 21, and the fixing rods 21 have the functions of opening and retracting. When the fixing rods 21 are opened, one end thereof is pressed against the well wall 200. When the fixing rods 21 are retracted, the fixing rods 21 do not contact the well wall 200.

[0043] In the above arrangement, the expansion of the fixing rod 21 presses the outer shell 10 against the well wall 200, thereby ensuring that the inner core 30 can rotate smoothly relative to the outer shell 10, thereby ensuring that the steering position of the steering channel 31 can be smoothly adjusted, and ensuring that the walking drill rig 40 can align with the drilling target when the exit position of the reserved channel 11 is reached. Ultimately, this ensures that the electric drilling device 100 can operate normally.

[0044] Specifically, if Figure 1As shown, in one embodiment, the fixing member 20 includes two groups of fixing rods 21, each group of fixing rods 21 includes multiple fixing rods 21, and the multiple fixing rods 21 are spaced apart along the circumferential direction of the housing 10. The two groups of fixing rods 21 are spaced apart along the axial direction of the housing 10.

[0045] Specifically, in one embodiment, the reserved channel 11 is an open groove opened along the circumference of the housing 10 .

[0046] In the above arrangement, the open slots provide a guiding function, directing the drill bit 411 of the traveling drill rig 40 to the sidetracking point, thereby ensuring that the initial sidetracking drilling direction of the electric drilling device 100 maintains a zero or minimum angle with the radial direction of the target point. This allows subsequent fine-tuning of the drill bit 411 of the traveling drill rig 40 to ensure that the traveling drill bit 411 reaches the target point according to the pre-set wellbore trajectory. This reduces the amount of adjustment required for the drilling direction of the drill bit 411, thereby improving the drilling efficiency of the electric drilling device 100.

[0047] Specifically, in one embodiment, the length of the opening slot is ¾ of the circumference of the housing 10 .

[0048] Of course, in alternative embodiments not shown in the present application, the length of the opening slot can be set to 4 / 5 of the circumference of the housing 10 or other values.

[0049] Specifically, if Figure 1 As shown, in one embodiment, the diverting channel 31 includes an axial channel 311 and a curved channel 312. One end of the curved channel 312 is connected to the axial channel 311, and the other end can be connected to the reserved channel 11. The curved channel 312 can divert the axial movement of the traveling drilling rig 40 along the wellbore into radial movement.

[0050] In the above arrangement, the steering channel 31 has a steering function, namely, it can provide a crawling channel for the traveling drilling rig 40. It also has a guiding function, which can guide the drill bit 411 of the traveling drilling rig 40 to the sidetracking point, thereby ensuring that the angle between the initial sidetracking drilling direction of the electric drilling device 100 and the radial direction of the target target point is zero or minimum. In this way, subsequent fine-tuning of the drill bit 411 of the traveling drilling rig 40 is sufficient to ensure that the traveling drilling rig 411 drills to the target target point according to the preset wellbore trajectory. This reduces the amount of adjustment required for the drilling direction of the drill bit 411, thereby improving the drilling efficiency of the electric drilling device 100.

[0051] Specifically, if Figure 2 As shown, in one embodiment, the walking drilling rig 40 includes a drilling assembly 41 and a guide crawler assembly 42 connected to the drilling assembly.

[0052] In the above arrangement, the drilling assembly 41 is used to perform rock-breaking drilling on the well wall 200, and the guide crawler assembly 42 can ensure that the drilling assembly 41 can accurately reach the sidetracking point. The drilling assembly 41 cooperates with the guide crawler assembly 42 to realize the sidetracking function of the electric drilling device 100.

[0053] Specifically, if Figure 2 As shown, in one embodiment, the drilling assembly 41 includes a drill bit 411, a rotary drive 412, and a weight-on-bit (WOB) member 413. The rotary drive 412 is connected to the drill bit 411, and the WOB member 413 is connected to the drill bit 411.

[0054] In the above arrangement, the rotary drive 412 rotates the drill bit 411, providing torque. The weight-on-bit (WOB) application component 413 applies pressure to the drill bit 411. The rotary drive 412 and the WOB application component 413 work together to achieve rock-breaking drilling, thereby ensuring the proper operation of the electric drilling device 100.

[0055] Specifically, if Figure 2 As shown, in one embodiment, the drilling assembly 41 further includes a rotary turbine 414 , which is sleeved on the transmission shaft of the drill bit 411 and located at the bottom of the rotary drive member 412 .

[0056] Specifically, if Figure 2 As shown, in one embodiment, the weight-on-bit application component 413 includes a piston outer core shaft 4131, a piston inner core shaft 4132, and an electrically controlled piston 4133. The piston outer core shaft 4131 is connected to the drill bit 411, the piston inner core shaft 4132 is slidably connected to the piston outer core shaft 4131, and the electrically controlled piston 4133 is disposed on the outer circumference of the piston inner core shaft 4132. When energized, the electrically controlled piston 4133 drives the piston outer core shaft 4131 to move axially.

[0057] In the above arrangement, the piston inner core shaft 4132 has a guiding function, which can ensure that the electric-controlled piston 4133 expands along the axial direction of the piston inner core shaft 4132 after being energized to apply pressure to the piston outer core shaft 4131, thereby applying pressure to the drill bit 411, thereby realizing the pressure-applying function of the drilling pressure applying member 413.

[0058] Specifically, if Figure 2 As shown, the electric control piston 4133 is a conductive coil, which is sleeved on the outer circumference of the piston outer core shaft 4131.

[0059] Specifically, if Figure 2As shown, in one embodiment, the guide crawling assembly 42 includes a piston outer cylinder 421, a positioning and direction adjustment structure 422, and a crawling structure 423. The piston outer cylinder 421 is slidably connected to the piston outer core shaft 4131. The positioning and direction adjustment structure 422 is disposed on the outer circumference of the piston outer cylinder 421. The crawling structure 423 is disposed on the outer circumference of the piston outer cylinder 421 and is spaced apart from the positioning and direction adjustment structure 422.

[0060] Specifically, if Figure 2 As shown, in one embodiment, the positioning and direction adjustment structure 422 includes a plurality of telescopic direction adjustment rods 4221 arranged at intervals along the circumference of the piston outer cylinder 421 .

[0061] In the above arrangement, by adjusting the telescopic length of the telescopic steering rod 4221, the steering function of the traveling drilling rig 40 in the side-drilled wellbore is realized, that is, the traveling drilling rig 40 can be moved in the side-drilled wellbore, thereby ensuring that the electric drilling device 100 can work normally.

[0062] Specifically, if Figure 2 As shown, in one embodiment, the positioning and direction adjustment structure 422 includes two upper and lower groups of telescopic direction adjustment rods 4221. The upper and lower groups of telescopic direction adjustment rods 4221 are spaced apart along the axial direction of the piston outer tube 421, and each group of telescopic direction adjustment rods 4221 includes multiple telescopic direction adjustment rods 4221 spaced apart along the circumference of the piston outer tube 421.

[0063] Specifically, if Figure 2 As shown, in one embodiment, the crawling structure 423 includes a plurality of telescopic crawling teeth 4231 arranged at intervals along the circumference of the piston outer cylinder 421.

[0064] In the above arrangement, the crawling function of the walking drill rig 40 in the sidetrack wellbore is achieved by adjusting the telescopic creeping teeth 4231 to cooperate with the weight-on-bit application member 413, thereby ensuring that the electric drilling device 100 can work normally.

[0065] Specifically, if Figure 2 As shown, in one embodiment, the weight-on-bit application component 413 further includes an upper contact energizing connector 4134, a lower contact energizing connector 4135, and a contact energizing wire 4136. The upper contact energizing connector 4134 is disposed on the piston outer cylinder 421. The lower contact energizing connector 4135 is disposed on the piston outer core shaft 4131. One end of the contact energizing wire 4136 is connected to the upper contact energizing connector 4134, and the other end thereof is magnetically bonded to the lower contact energizing connector 4135.

[0066] Example 2

[0067] like Figure 3As shown, the present invention also provides a drilling system, which includes a ground control device 300, the above-mentioned electric drilling device 100 and a steel cable fiber bundle 400. One end of the steel cable fiber bundle 400 is connected to the ground control device 300, and the other end is connected to the electric drilling device 100.

[0068] Specifically, if Figure 3 As shown, in one embodiment, the surface control unit 300 primarily receives and analyzes downhole photoelectric signals, controlling the start and stop of the downhole drilling unit and modifying its drilling direction. The electric drilling unit 100 is primarily used for downhole sidetracking. The steel wire in the steel cable fiber bundle 400 is used to quickly lower the main unit of the electric drilling unit 100. The main unit's position can be adjusted by raising and lowering the cable system to achieve sidetracking in different reservoir formations. The cable system primarily provides power for the downhole electric drilling unit 100, while the fiber optic system primarily assists in downhole data acquisition and the issuance of surface control commands. Given the power and drill bit characteristics of the electric drilling unit 100, this device is particularly suitable for use in open-hole wellbores. When the electric drilling unit 100 is lowered to the designed position, the fixing rod 21 of the fixing member 20 opens in response to the photoelectric signal, firmly stabilizing the electric drilling unit 100 in the designed position in the open-hole wellbore. The stability of the electric drilling unit 100 ensures subsequent sidetracking.

[0069] like Figure 3As shown, the present application is provided with a stretchable cable 402. When the traveling drilling rig 40 drills deeper, the stretchable cable 402 can extend as the traveling drilling rig 40 drills deeper. When the traveling drilling rig 40 withdraws from the drilled wellbore, the stretchable cable can retract with the withdrawal of the traveling drilling rig 40, thereby continuously providing power and fiber optic signal channels for the movement of the traveling drilling rig 40. The present application is provided with a transmission cable fiber optic bundle 401, which is a portion of the wire cable fiber optic bundle 400 and is used to suspend the electric drilling device 100 and transmit signals. When the electric drilling device 100 is lowered to the set position via the steel cable fiber bundle 400, if the direction corresponding to the steering channel 31 differs significantly from the planned drilling target direction and cannot be adjusted by the traveling drill rig 40, or the adjustment trajectory is too complicated, which is not conducive to the entry and exit of the traveling drill rig 40, then the ground control device 300 issues a control command to the downhole tool, causing the inner core 30 to rotate so that the curved channel 312 of the steering channel 31 corresponds to the planned drilling target direction. The outer shell 10 is mainly used to protect the internal structural components and has built-in electrical circuits. The instructions for the opening and retraction of the fixing member 20 can be transmitted through the built-in circuit. The reserved channel 11 is opened on the shell, and its length occupies three-quarters of the shell circumference. The remaining one-quarter is solid and is an integral structure with the shell 10. That is, the effective turning angle of the inner core 30 is three-quarters of the circumference. If the target point of the target drilling is in the direction of the fan-shaped radiation of the three-quarter opening, the walking drill 40 can drill in a straight line towards the target point by adjusting the turning angle of the inner core 30. If the electric drilling device 100 is lowered and fixed, the target point of the target drilling is in the direction of the fan-shaped radiation of the one-quarter opening, then the electric drilling device 100 can be adjusted. By adjusting the turning angle of the inner core 30 until the direction corresponding to the steering channel 31 forms an angle of 0 or the minimum angle with the target point, the trajectory of the walking drilling rig 40 is fine-tuned during drilling, so that the walking drilling rig 40 can drill toward the target point. At the same time, a retractable cylinder is reserved on the reserved channel 11, which can be extended to the wall of the open hole well as the movement of the walking drilling rig 40. The internal channel from the reserved channel 11 to the wall of the open hole well is conducive to the smooth arrival of the walking drilling rig 40 at the wall of the open hole well and the retraction of the walking drilling rig 40 in the later stage.

[0070] like Figure 2As shown, four groups of upper and lower telescopic steering rods are arranged circumferentially. By extending outward and contacting the wellbore wall, the entire traveling drilling rig 40 is suspended and fixed. Simultaneously, the varying extension and retraction of the upper and lower telescopic steering rods allows for fine-tuning of the drilling direction of the traveling drilling rig 40, thereby changing the drilling trajectory and achieving intelligent trajectory-controlled drilling. When the upper and lower telescopic steering rods are extended and fixed, and the drill bit 411 reaches its maximum drilling stroke, the telescopic creeping teeth 4231 extend and contact the open-hole wellbore wall. The upper and lower telescopic steering rods retract, and under command, the telescopic creeping teeth 4231 advance the drill bit 411's maximum stroke or retreat into the wellbore. During drilling, the telescopic creeping teeth 4231 disengage from the open-hole wellbore wall. When the upper and lower telescopic steering rods are extended and fixed, and the drill bit 411 is powered and rotated to break rock, the electric piston 4133 expands, pushing the piston's outer core shaft 4131 forward, thereby assisting the drill bit 411 in breaking rock and drilling. When the piston's outer core shaft 4131 reaches its maximum travel, the energized upper contact 4134 and the energized lower contact 4135 disengage, causing the electric piston 4133 to retract. The telescopic creeping teeth 4231 extend and contact the open hole wall, and the upper and lower telescopic steering rods retract, allowing the telescopic creeping teeth 4231 to advance. The range of motion of the piston's inner core shaft 4132 is confined within the travel cavity of the electric piston 4133, allowing it to move relative to the piston's outer core shaft 4131. This ensures the stability of the entire piston travel section (the piston's outer core shaft 4131, the rotary drive element 412, and the drill bit 411) while performing the expansion and retraction functions of the electric piston 4133. The piston outer cylinder 421 serves as the outer cylinder for the electrically controlled piston 4133. It also houses the upper and lower telescopic steering rods, telescopic creeping gears 4231, upper and lower contact energizing connectors, contact energizing wires 4136, and corresponding control circuitry. The piston outer core shaft 4131, as an extension of the electrically controlled piston, transmits the required drilling pressure to the drill bit 411, assisting in rock-breaking drilling. A sliding hole 4137 is provided within the piston outer core shaft 4132, providing travel space for the piston inner core shaft 4132. It is also designed to connect and mount the rotary drive 412, the drill bit 411, and the rotating turbine 414. The rotary drive 412 is a high-temperature, high-pressure motor that can be turned on and off by command. It primarily provides rotary power to the drill bit 411, enabling it to rotate and break rock. The drill bit 411, equipped with wear-resistant cutting teeth, rotates at high speed to break rock, enabling sidetracking drilling downhole.A contact wire 4136 is installed on the contact-energized upper connector 4134. When the electric-controlled piston 4133 expands, the contact wire 4136 is connected to the contact-energized lower connector 4135. The contact-energized upper connector 4134, the contact wire 4136 and the contact wire 4136 are in a connected and energized state. When the piston outer core shaft 4131 extends to the maximum stroke, the contact wire 4136 is disengaged from the contact-energized lower connector 4135 and the power is cut off, so that the feedback signal controls the electric-controlled piston 4133 to no longer expand and push the piston outer core shaft 4131 to continue to extend. At this time, the contact wire 4136 retracts into the contact-energized upper connector 4134. When the piston outer core shaft 4131 extends the stroke distance before retraction, the contact wire 4136 is reconnected with the contact wire 4136. Contact wire 4136 is retractable. When the lower contact connector 4135 and the lower contact connector 4136 contact, an electrical path is formed, indicating an energized state. When the piston outer core shaft 4131 extends to its maximum stroke, contact wire 4136 disengages from the lower contact connector 4135, deenergizing the contact wire. Contact wire 4136 automatically retracts into the upper contact connector 4134. Lower contact connector 4135 is designed to magnetically bond with contact wire 4136, energizing it. After reaching a certain stroke, it can disengage from contact wire 4136, deenergizing it. The inner wall of the steering channel 31 allows the traveling drill rig 40 to complete steering, thereby aligning perpendicularly to the open hole wall to initiate drilling. The rotational force generated by the rotary drive 412 is transmitted to the drill bit 411, enabling rock-breaking drilling.

[0071] It should be noted that the rotary turbine 414 is designed with two functions. One is to sweep the mixture of debris and downhole fluid generated by the rock breaking of the drill bit 411, cool the drill bit, and clean the rock cuttings between the rotary turbine 414 and the drill bit 411 and push them to the rear. The other hand has a function similar to thread withdrawal. When the entire walking drilling rig 40 retreats, it can assist it to withdraw from the drilled side drilling wellbore and bring out the drilled rock cuttings at the same time.

[0072] Example 3

[0073] like Figure 4 As shown, the present invention also provides a drilling method, which uses the above-mentioned electric drilling device 100 and includes the following steps:

[0074] Step S1, lowering the electric drilling device to a preset well depth;

[0075] Step S2, fixing the housing to the well wall using a fixing member;

[0076] Step S3, rotating the inner core to adjust the steering position of the steering channel;

[0077] Step S4, aligning the traveling drill with the target drilling point;

[0078] Step S5: Drilling with a traveling drilling rig.

[0079] like Figures 1 to 4 As shown, in combination with the above-mentioned drilling system and electric drilling device 100, a complete drilling method in this application is described below, specifically as follows:

[0080] After the electric drilling device 100 is lowered into the target layer, the fixed rod 21 is fully opened, the outer shell 10 is fixed, and according to the information displayed on the ground control device 300 fed back from the downhole, the inner core 30 is rotated until the angle between the exit ray direction of the steering channel 31 and the radial direction of the target point is 0 or minimum, the upper and lower sets of telescopic adjustment rods 4221 are retracted, and the telescopic creeping teeth 4231 are extended.

[0081] When the inner wall of the steering channel 31 moves to the point where it contacts the open hole wall, the telescopic creeping teeth 4231 are retracted, and the upper and lower sets of telescopic steering rods 4221 are extended. The telescopic lengths of the upper and lower sets of telescopic steering rods 4221 are adjusted according to the direction of the target point, thereby adjusting the linear drilling direction of the drill bit 411. At this time, the ground control device 300 controls the rotary drive member 412 to be energized, so that the drill bit 411 rotates at high speed to break the rock, and the rotating turbine 414 cooperates to clean the drill cuttings mixture to drill a new sidetrack wellbore. At the same time, the electrically controlled piston 4133 pushes the piston outer core shaft 4131, and the piston outer core shaft 4131 pushes the drill bit 411 forward to break the rock.

[0082] When the drill bit 411 moves forward to the designed maximum stroke, the energized lower joint 4135 is disengaged from the energized upper joint 4134, and the piston outer core shaft 4131, the rotary drive member 412, the drill bit 411 and the rotary turbine 414 retract to the initial stroke state.

[0083] The upper and lower sets of telescopic steering rods 4221 are retracted, and the telescopic creeping teeth 4231 are extended. The telescopic creeping teeth 4231 drive the entire electric drilling device 100 to move the previously drilled distance into the side drilling wellbore, and then start drilling another distance, and repeat this cycle until the side drilling wellbore communicates with the target point.

[0084] The upper and lower sets of telescopic steering rods 4221 are retracted, and the telescopic creeping teeth 4231 are extended, and the self-propelled electric drilling device 100 is pulled out of the previously drilled sidetrack wellbore and into the steering channel 31 .

[0085] The fixed rod 21 is then retracted, the steel cable fiber bundle 400 is raised or lowered, the target well section to be drilled is adjusted, and the sidetracking drilling is continued until the entire sidetracking wellbore is drilled and the fracture or effective target point around the original wellbore is reached. After completion, the steel cable fiber bundle 400 is raised and the entire electric drilling device 100 is retracted.

[0086] It should be noted that the drilling system of the present invention can, on the one hand, quickly lower the main unit of the electric drilling system to the designed position of the ultra-deep wellbore through the cable, and at the same time, it can be rotated underground to adjust and select different circumferential directions at the same depth as the side drilling point, ensuring that the angle between the initial drilling direction of the side drilling and the radial direction of the target point is 0 or minimum, reducing the adjustment of the wellbore trajectory direction by adjusting the drill bit direction. After drilling a small side drilling wellbore, the main unit of the electric drilling system can be driven to change the well depth position by raising or lowering the cable, realizing the drilling of new side drilling wellbores in different layers and sections, and meeting the prerequisites for drilling multiple side drilling wellbores in one wellbore. On the other hand, through the power and fiber optic control system, electric side drilling that is not limited by the well depth can be realized. While drilling, the fiber optic system and the ground control system can realize the synchronous transmission of data and the synchronous issuance of control instructions, thereby controlling the electric drilling while adjusting the drilling direction in real time, realizing intelligent control of the underground trajectory, and increasing the probability of communicating with new oil and gas fractures and caves at a relatively low cost. The purpose is to save time and cost, not be affected by well depth, adjust the well trajectory direction at any time under control, effectively connect fractures and caves, and increase single well production.

[0087] It should be noted that the relatively inexpensive coiled tubing ultra-short radius radial horizontal well drilling technology currently has the following two main deficiencies: First, it requires high water pressure for rock-breaking drilling. Since hydraulic transmission is mainly through coiled tubing, the pipe diameter is small, resulting in large hydraulic friction losses. Currently completed coiled tubing ultra-short radius radial horizontal well drilling cases are mainly concentrated in wells shallower than 3,200 meters. Beyond 3,200 meters, the wellhead pressure is too high, the crawling distance is limited, and the engineering difficulty increases dramatically, resulting in few successful cases. Second, its propulsion is mainly generated by the reaction force generated by the back jet of the high-pressure jet drill bit. If the reservoir being drilled is heterogeneous or even has cracks, gaps, and holes, the drilling trajectory will be uncontrollable. The drilling system in this application can replace coiled tubing technology and overcome the above-mentioned problems.

[0088] It should be noted that the electric drilling system for ultra-deep wells provided by the present invention can, on the one hand, quickly lower the main device of the electric drilling system to the designed position of the ultra-deep wellbore through a cable, and at the same time, it can be rotated underground to adjust and select different circumferential directions at the same depth position as the side drilling point, thereby reducing the adjustment of the wellbore trajectory direction by adjusting the drill bit direction, ensuring that the angle between the initial drilling direction of the side drilling and the radial direction of the target point is 0 or minimum. After drilling a small side drilling wellbore, the main device of the electric-controlled drilling system can be driven to change the well depth position by lifting or lowering the cable, thereby realizing the drilling of new side drilling wellbores in different layers and sections, and having the prerequisite for drilling multiple side drilling wellbores in one wellbore; on the other hand, through the power and fiber optic control system, electric-powered side drilling that is not limited by the well depth can be realized, and while drilling, the fiber optic system and the ground control system can realize synchronous transmission of data and synchronous issuance of control instructions, thereby controlling the electric drilling while adjusting the drilling direction in real time, realizing intelligent control of the underground trajectory, and increasing the probability of communicating with new oil and gas fractures and caves as much as possible at a relatively low cost, thereby achieving the purpose of increasing the production of old wells. The present invention realizes the functions of cable transportation, multi-layer side drilling, electric power drilling, and repeated drilling. It saves time and cost, is not affected by the well depth, and can adjust the wellbore trajectory direction at any time under control. It is beneficial to communicate with fractures and caves underground and increase the production of single wells. This invention provides a new technical option for achieving rapid production increase in ultra-deep carbonate reservoirs.

[0089] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0090] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. An electric drilling device for ultra-deep wells, characterized in that: include: The shell is provided with a reserved channel; a fixing member, disposed on the housing; an inner core rotatably disposed in the outer shell, wherein the inner core is provided with a steering channel; A walking drilling rig capable of moving within the reserved channel and the steering channel; When the electric drilling device is lowered to a preset well depth, the fixing member is actuated to fix the outer shell to the well wall, and the steering position of the steering channel is adjusted by rotating the inner core to ensure that the traveling drilling rig can align with the target drilling point when it moves to the exit position of the reserved channel; The steering channel includes: Axial channel; a curved channel, one end of which is connected to the axial channel and the other end of which is capable of being connected to the reserved channel; The curved channel can convert the axial movement of the traveling drilling rig along the wellbore into radial movement; The walking drilling rig includes a drilling assembly and a guide crawling assembly connected to the drilling assembly, and the drilling assembly includes: drill; A rotary drive member connected to the drill bit, wherein the rotary drive member is a high-temperature and high-pressure resistant motor; A weight-on-bit applying member connected to the drill bit; The weight-on-bit application component comprises: A piston outer core shaft connected to the drill bit; The inner core shaft of the piston is slidably connected to the outer core shaft of the piston; An electrically controlled piston is provided on the outer periphery of the inner core shaft of the piston, and the electrically controlled piston is a conductive coil; The guide crawling assembly includes: A piston outer cylinder, slidably connected to the piston outer core shaft; A positioning and direction adjustment structure is provided on the outer periphery of the piston outer cylinder; A crawling structure is provided on the outer periphery of the piston outer cylinder and is spaced apart from the positioning and direction adjustment structure; The positioning and direction adjustment structure includes a plurality of telescopic direction adjustment rods arranged at intervals along the circumference of the piston outer cylinder; The crawling structure includes a plurality of telescopic crawling teeth spaced apart along the circumference of the piston outer cylinder; The weight-on-bit application component further comprises: An upper contact for electrical contact is provided on the outer cylinder of the piston; A contact energized lower connector, disposed on the outer core shaft of the piston; a contact wire, one end of which is connected to the contact upper terminal and the other end of which is magnetically bonded to the contact lower terminal; Wherein, the electrically controlled piston is energized to drive the outer core shaft of the piston to move axially; The fixing member includes a plurality of fixing rods, each of which has an opening and a retracting function. When the fixing rod is opened, one end thereof is pressed against the well wall. When the fixing rod is retracted, the fixing rod does not contact the well wall. The reserved channel is an open groove opened along the circumference of the shell; The length of the opening slot is 3 / 4 of the circumference length of the shell.

2. A drilling system, characterized in that: include: Ground control unit; The electric drilling device according to claim 1; A steel cable optical fiber bundle has one end connected to the ground control device and the other end connected to the electric drilling device.

3. A drilling method, characterized in that: The drilling method uses the electric drilling device according to claim 1, comprising the following steps: Step S1, lowering the electric drilling device to a preset well depth; Step S2, fixing the housing to the well wall using a fixing member; Step S3, rotating the inner core to adjust the steering position of the steering channel; Step S4: Align the traveling drill with the target point to be drilled. Step S5: Drilling a well using the walking drilling rig.

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