Distance measurement while drilling method and device for upper and lower parallel wells

Abstract

The invention relates to the technical field of downhole tools, in particular to an up-down parallel well distance measurement while drilling method and device, and aims at solving the problems that a traditional distance measurement mode is low in operation efficiency and unstable in signal transmission. The device comprises a power assembly, a drilling tool assembly and a detachable measuring unit. The measuring unit is integrated with a power generator, a signal collector and a pulser, the power generator is driven by slurry flow in the drilling process to generate power, continuous power is provided for the signal collector, underground magnetic signals are collected in real time, data pulses are transmitted to a ground receiving system through the pulser, and distance measurement while drilling is achieved; and a logging instrument does not need to be additionally put down, adjacent well operation interruption is avoided, and the operation efficiency and the production continuity are remarkably improved. The power assembly is provided with a multi-cavity grading adjustable slurry pump, the number and the running speed of piston plates put into work can be automatically adjusted according to the drilling load, and dynamic matching and efficient output of slurry flow are achieved.

Description

Technical Field

[0001] This invention relates to the field of downhole tool technology, specifically to a method and device for measuring distance while drilling in parallel wells. Background Technology

[0002] Traditional parallel horizontal well magnetic steering measurement technology typically requires lowering a magnetic steering instrument via cable into a deep, completed casing well (Well 1). An in-well fluxgate sensor receives the magnetic field signal emitted by an active high-strength magnetic connector lowered during drilling in the relatively shallower upper well (Well 2). A complex inversion algorithm is then used to calculate the relative spatial distance and azimuth between the two wells. However, this method has significant drawbacks: the casing shields and interferes with the magnetic field signal, affecting inversion accuracy; data processing is cumbersome; simultaneous operation of both wells is required, limiting the drilling efficiency of the upper well; the numerous steps and frequent tripping of the drill string result in a long overall operation cycle and high costs; the limited flow rate adjustment range of the mud pump makes it difficult to dynamically match mud supply according to drilling conditions, leading to unstable downhole power; signal acquisition and data transmission rely on external power, resulting in poor continuous operation capability; and the power system lacks multi-stage loading and synchronous control mechanisms, hindering efficient and energy-saving mud delivery. Summary of the Invention

[0003] To alleviate the above-mentioned technical problems, the technical solution provided by the present invention is as follows: The device provided by this invention includes a power assembly, a drill string assembly, and a measuring unit. The power assembly is mounted on a drilling platform. The drill string assembly is rotatably connected to the power assembly. The measuring unit is detachably connected to the drill string assembly. The measuring unit includes a generator, a signal acquisition unit, and a pulse generator. The generator is electrically connected to the signal acquisition unit and the pulse generator. When the power assembly drives the mud to flow to the drill string assembly, the generator generates electricity to supply the signal acquisition unit to collect magnetic signals in the well, which are then transmitted to the pulse generator to transmit data back to the surface.

[0004] Furthermore, The powertrain includes a mud pump; The mud pump has multiple pump chambers arranged in a linear fashion. Each pump chamber is slidably connected to a piston plate. When the rotational torque, rotational speed and / or diving speed of the drill assembly increase, the multiple piston plates begin to slide sequentially in the linear direction. After all the piston plates have slid, the mud flow rate can be further increased by increasing the sliding speed of the piston plates.

[0005] Furthermore, A first motor is fixedly connected to the drilling platform. A first rotating shaft is fixedly connected to the output end of the first motor. A cam assembly corresponding to multiple piston plates is coaxially mounted on the first rotating shaft. The cam assembly includes two discs. An eccentric rod is fixedly connected between the two discs. A connecting rod is rotatably connected to the eccentric rod. The other end of the connecting rod is hinged to the corresponding piston plate.

[0006] Furthermore, Each of the two disks of the multiple cam assemblies is coaxially connected with a rod and a sleeve, and the rod of one of the two adjacent cam assemblies is inserted into the sleeve of the other. A rotating base is fixedly connected to the drilling platform, and the insert is rotatably connected to the rotating base; A synchronizing rod is radially inserted into the insert cylinder. When the synchronizing rod slides towards the insert rod, the insert rod is locked in the insert cylinder, so that the two adjacent cam assemblies rotate synchronously.

[0007] Furthermore, Two semi-circular rings are radially symmetrically slidably connected on the rotary seat. Two first hydraulic rods are symmetrically fixedly connected on the drilling platform in the radial direction of the rotary seat. The output ends of the two first hydraulic rods are fixedly connected to crossbars. When the first hydraulic rods extend, the two crossbars push the outer walls of the two semi-circular rings respectively, so that the two semi-circular rings merge to push the synchronizing rod to abut against the insertion rod. A ball bearing is installed at the end of the synchronizing rod away from the insertion rod, and a spring is installed between the top of the synchronizing rod and the outer wall of the insertion cylinder.

[0008] Furthermore, A second motor is fixedly connected to the drilling platform. The output end of the second motor is connected to a second rotating shaft. Multiple gears are installed on the second rotating shaft. The side walls of the two discs of the multiple cam assemblies are each provided with teeth that mesh with a gear. As the multiple piston plates begin to slide in turn, the multiple gears rotate one by one following the second rotating shaft.

[0009] Furthermore, The inner wall of the gear is equipped with a permanent magnet, and an electromagnetic coil ring that cooperates with the permanent magnet is installed on the second shaft. A rotor that is electrically connected to the electromagnetic coil ring is also installed on the second shaft. The drilling platform is equipped with a stator that cooperates with the rotor through a bracket. The stator and the rotor together form a slip ring assembly. The output end of the second motor is connected to a drive gear via a one-way bearing, and the end of the second rotating shaft is fixedly connected to an internal gear ring that meshes with the drive gear. As the number of cam assemblies increases, the output torque of the second motor increases synchronously.

[0010] Furthermore, The mud pump is fixedly connected to multiple second hydraulic rods corresponding to multiple connecting rods. The output ends of the multiple second hydraulic rods are all fixedly connected to mounting brackets. Rollers are rotatably connected to the mounting brackets. When the cam assembly corresponding to the corresponding piston plate stops rotating, the corresponding second hydraulic rod extends, thereby the roller pushes the connecting rod to swing, so that the eccentric rod of the corresponding cam assembly moves to the lowest quadrant point of the disk.

[0011] Furthermore, The drill assembly includes a rotary table, drill pipe, and drill bit; the rotary table is mounted on the drilling platform; the drill pipe is slidably connected to the rotary table; the drill bit is located at the end of the drill pipe; the drill pipe and the drill bit have interconnected mud holes at their centers; the top of the drill pipe is rotatably connected to a mud output pipe that communicates with the mud holes; the mud output pipe is connected to a mud pump.

[0012] A method for measuring distance while drilling in parallel wells includes the aforementioned measuring distance while drilling device for parallel wells, and comprises the following steps: S1: After the measuring unit is lowered into the well along with the drill string assembly, the mud pump is started to prepare for distance measurement; S2: Automatically increases the mud flow rate of the mud pump according to the drilling load; S3: The generator uses mud slurry to generate electricity, which drives the acquisition of magnetic signals; S4: The measurement unit transmits the collected data to the ground via pulses; S5: Continuous cyclic ranging until drilling is complete.

[0013] The beneficial effects of the vertical parallel well drilling distance measurement method and device of the present invention are analyzed as follows: This device includes a power assembly, a drill string assembly, and a measurement unit. The power assembly is mounted on the drilling platform. The drill string assembly is rotatably connected to the power assembly. The measurement unit is detachably connected to the drill string assembly. The measurement unit includes a generator, a signal acquisition unit, and a pulse generator. The generator is electrically connected to the signal acquisition unit and the pulse generator. When the power assembly drives the mud to flow to the drill string assembly, the generator generates electricity to supply the signal acquisition unit to collect magnetic signals in the well, which are then transmitted to the pulse generator to transmit data back to the surface.

[0014] By integrating a generator, signal acquisition unit, and pulse generator into a single measurement unit, the generator is powered by the mud flow during drilling, enabling real-time acquisition of downhole magnetic signals and transmission of surface data. This achieves the goal of simultaneous drilling and distance measurement, eliminating the need for additional logging tools and the need for production shutdowns in adjacent wells, significantly improving operational efficiency and production continuity. Simultaneously, the innovatively designed multi-chamber staged adjustable mud pump automatically adjusts the number of piston plates and their operating speed according to the drilling load, achieving dynamic matching of mud flow. Furthermore, the locking mechanism between the insert rod and cylinder and the synchronizing rod between the cam assemblies ensures synchronized piston movement under high-flow conditions, preventing pressure fluctuations and guaranteeing stable fluid supply. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A first-view structural schematic diagram of a vertically parallel well drilling distance measuring device provided for an embodiment of the present invention; Figure 2 A second-view structural schematic diagram of a vertically parallel well drilling distance measuring device provided for an embodiment of the present invention; Figure 3 This is a schematic diagram of the drill pipe structure; Figure 4 This is a schematic diagram of a mud pump. Figure 5 This is a schematic diagram of the cam assembly. Figure 6 This is a cross-sectional view of the disk; Figure 7 A schematic diagram of the first-view structure of the second rotating axis; Figure 8 This is a connection diagram for the second motor; Figure 9 This is a schematic diagram of the second-view structure of the second rotating axis; Figure 10 This is a schematic diagram of the second hydraulic rod from a first-view perspective. Figure 11 This is a schematic diagram of the second hydraulic rod from a second-view perspective. Figure 12 A flowchart of a method for measuring distance while drilling in parallel wells provided for an embodiment of the present invention.

[0017] icon: 100. Drilling platform; 110. Rotary table; 120. Drill pipe; 130. Drill bit; 140. Mud hole; 200, mud pump; 210, pump chamber; 220, mud inlet pipe; 230, mud outlet pipe; 240, piston plate; 250, connecting rod; 260, disc; 270, eccentric rod; 300, First motor; 310, First rotating shaft; 320, Rotary base; 330, Insert sleeve; 340, Insert rod; 350, Synchronizing rod; 360, Ball bearing; 361, Spring; 370, Semi-circular ring; 380, First hydraulic rod; 381, Crossbar; 400. Second motor; 410. Drive gear; 420. Internal gear ring; 430. Second shaft; 440. Gear; 441. Permanent magnet; 450. Electromagnetic coil ring; 460. Rotor; 470. Stator; 471. Support. 500, Second hydraulic rod; 510, Mounting bracket; 520, Roller. Detailed Implementation

[0018] Conventional downhole ranging methods require simultaneous operation of two wells, which is inefficient. The casing can shield and interfere with the magnetic field signal, affecting the inversion accuracy. The mud pump has a limited flow rate adjustment range, making it difficult to dynamically match the mud supply according to the drilling conditions, resulting in unstable downhole power supply.

[0019] In view of this, as shown in the figure, this solution provides a method and device for measuring distance while drilling in parallel wells to alleviate the above problems.

[0020] The device provided by the present invention includes a power assembly, a drill string assembly, and a measuring unit; the power assembly is mounted on a drilling platform 100; the drill string assembly is rotatably connected to the power assembly; the measuring unit is detachably connected to the drill string assembly; the measuring unit includes a generator, a signal acquisition unit, and a pulse generator; the generator is electrically connected to the signal acquisition unit and the pulse generator; when the power assembly drives the mud to flow to the drill string assembly, the generator generates electricity to supply the signal acquisition unit to collect magnetic signals in the well, and then transmits them to the pulse generator to transmit data back to the surface.

[0021] Specifically, the powertrain provides power to the drill string assembly and measurement unit. During downhole drilling, the measurement unit collects magnetic signals from the well and transmits them to the surface, enabling simultaneous drilling and measurement without the need to lower additional equipment. This also eliminates the need to shut down connected wells, thus improving operational and production efficiency.

[0022] In this design, the powertrain includes a mud pump 200; The mud pump 200 has multiple pump chambers 210 arranged linearly. Each pump chamber 210 is slidably connected to a piston plate 240. When the rotational torque, rotational speed and / or diving speed of the drill assembly increase, the multiple piston plates 240 begin to slide sequentially in the linear direction. After the multiple piston plates 240 have all slid, the mud flow rate can be further increased by increasing the sliding speed of the piston plates 240.

[0023] Specifically, multiple pump chambers 210 can be put into operation in stages as needed according to the load. First, the flow rate of mud is increased by increasing the number of piston plates 240 in operation, and then the flow rate of mud is increased by increasing the operating speed of piston plates 240.

[0024] In this scheme, a first motor 300 is fixedly connected to the drilling platform 100, and a first rotating shaft 310 is fixedly connected to the output end of the first motor 300. A cam assembly corresponding to a plurality of piston plates 240 is coaxially mounted on the first rotating shaft 310. The cam assembly includes two discs 260, and an eccentric rod 270 is fixedly connected between the two discs 260. A connecting rod 250 is rotatably connected to the eccentric rod 270, and the other end of the connecting rod 250 is hinged to the corresponding piston plate 240.

[0025] Powered by the first motor 300, the first rotating shaft 310 connected to the first motor 300 drives the disc 260 to rotate, causing the connecting rod 250, which is eccentrically connected to the disc 260, to drive the piston plate 240 to reciprocate.

[0026] In this scheme, each of the two disks 260 of the multiple cam assemblies is coaxially connected with a rod 340 and a sleeve 330, and the rod 340 of one of the two adjacent cam assemblies is inserted into the sleeve 330 of the other. A rotating base 320 is fixedly connected to the drilling platform 100, and a cylinder 330 is rotatably connected to the rotating base 320. A synchronizing rod 350 is radially inserted into the insert 330. When the synchronizing rod 350 slides toward the insert rod 340, the insert rod 340 is locked in the insert 330 so that the two adjacent cam assemblies rotate synchronously.

[0027] Specifically, the connected cam assemblies are physically connected to the insert rod 340 and the insert cylinder 330 through a structure. The insert cylinder 330 is equipped with a synchronizing rod 350. When it is inserted into the insert rod 340, it can rigidly lock the two connected cam assemblies and achieve synchronous rotation. This ensures that all the pistons in operation move in unison during high-displacement operation, avoids pump pressure fluctuations, and thus provides stability for mud output.

[0028] In this scheme, two semi-circular rings 370 are radially symmetrically slidably connected on the rotary seat 320, and two first hydraulic rods 380 are symmetrically fixedly connected on the drilling platform 100 in the radial direction of the rotary seat 320. The output ends of the two first hydraulic rods 380 are fixedly connected to crossbars 381. When the first hydraulic rods 380 extend, the two crossbars 381 push the outer walls of the two semi-circular rings 370 respectively, so that the two semi-circular rings 370 merge to push the synchronous rod 350 to abut against the insertion rod 340. A ball bearing 360 is installed at the end of the synchronizing rod 350 away from the insertion rod 340, and a spring 361 is installed between the top of the synchronizing rod 350 and the outer wall of the insertion cylinder 330.

[0029] Specifically, the first hydraulic rod 380 is slidably connected to the semi-circular ring 370. During the extension of the first hydraulic rod 380, it can push the outer wall of the semi-circular ring 370, causing the two semi-circular rings 370 to approach each other and eventually form a complete ring. During the process of the two semi-circular rings 370 approaching each other, the inner wall of the semi-circular ring 370 continuously slides and squeezes the ball 360, causing the synchronous rod 350 connected to the ball 360 to move downward, thereby locking the connected cam assembly. When it is necessary to release the lock of the connected cam assembly, the first hydraulic rod 380 moves downward in a controlled manner, and under the action of the spring 361, the synchronous rod 350 moves upward and pushes the two semi-circular rings 370 to separate.

[0030] In this scheme, a second motor 400 is fixedly connected to the drilling platform 100. The output end of the second motor 400 is connected to a second rotating shaft 430. Multiple gears 440 are installed on the second rotating shaft 430. Teeth that mesh with a gear 440 are provided on the side walls of the two discs 260 of the multiple cam assemblies. When the multiple piston plates 240 start to slide in turn, the multiple gears 440 rotate one after another with the second rotating shaft 430.

[0031] Specifically, the first motor 300 and the second motor 400 are respectively located at both ends of the cam assembly. When multiple cam assemblies need to be started, multiple gears 440 run sequentially to assist the cam assemblies in their operation.

[0032] In this scheme, a permanent magnet 441 is installed on the inner wall of the gear 440, an electromagnetic coil ring 450 that cooperates with the permanent magnet 441 is installed on the second rotating shaft 430, and a rotor 460 that is electrically connected to the electromagnetic coil ring 450 is also installed on the second rotating shaft 430. The drilling platform 100 is equipped with a stator 470 that cooperates with the rotor 460 through a bracket 471. The stator 470 and the rotor 460 together form a slip ring assembly. The output end of the second motor 400 is connected to the drive gear 410 via a one-way bearing, and the end of the second rotating shaft 430 is fixedly connected to an internal gear ring 420 that meshes with the drive gear 410. As the number of cam assemblies increases, the output torque of the second motor 400 increases synchronously.

[0033] Specifically, by engaging the active gear 410 with the one-way bearing, the torque of the second motor 400 is ensured to be transmitted in the correct direction, thus preventing reverse force transmission between the active gear 410 and the one-way bearing, which could damage the components.

[0034] In this scheme, a plurality of second hydraulic rods 500 corresponding to a plurality of connecting rods 250 are fixedly connected to the mud pump 200. The output ends of the plurality of second hydraulic rods 500 are all fixedly connected to the mounting brackets 510. Rollers 520 are rotatably connected to the mounting brackets 510. When the cam assembly corresponding to the piston plate 240 stops rotating, the corresponding second hydraulic rod 500 extends, thereby the rollers 520 push the connecting rods 250 to swing, so that the eccentric rod 270 of the corresponding cam assembly moves to the lowest quadrant position of the disk 260.

[0035] Specifically, when a pump chamber 210 does not need to work, the eccentric rod 270 of the corresponding cam assembly is moved to the lowest quadrant point of the disk 260 (i.e., the position where the eccentricity is 0), while the eccentric rod 270 in the working state is at the highest quadrant point, so that when the pump chamber 210 is started and stopped again, the overall force is balanced and the unbalanced load is avoided.

[0036] In this design, the drill assembly includes a rotary table 110, a drill pipe 120, and a drill bit 130. The rotary table 110 is mounted on the drilling platform 100. The drill pipe 120 is slidably connected to the rotary table 110. The drill bit 130 is located at the end of the drill pipe 120. Mud holes 140 are interconnected at the center of the drill pipe 120 and the drill bit 130. A mud output pipe 230, which communicates with the mud holes 140, is rotatably connected to the top of the drill pipe 120. The mud output pipe 230 is connected to a mud pump 200, which is also equipped with a mud input pipe 220. After the mud is input into the pump chamber 210 from the mud input pipe 220, it is discharged into the mud holes 140 from the mud output pipe 230.

[0037] A method for measuring distance while drilling in parallel wells includes the aforementioned measuring distance while drilling device for parallel wells, and further includes the following steps: S1: After the measuring unit is lowered into the well along with the drill string assembly, start the mud pump 200 to prepare for distance measurement; S2: Automatically increase the mud flow rate of mud pump 200 according to the drilling load; S3: The generator uses mud slurry to generate electricity, which drives the acquisition of magnetic signals; S4: The measurement unit transmits the collected data to the ground via pulses; S5: Continuous cyclic ranging until drilling is complete.

[0038] This solution has at least the following beneficial effects: The drilling distance measurement method and device provided in this solution for parallel wells effectively solves the problems of low efficiency caused by the need for simultaneous operation of two wells in traditional downhole distance measurement, the impact of casing shielding on signal accuracy, and unstable power supply from mud pumps. By integrating a generator, signal acquisition unit, and pulse generator into a single measurement unit, the generator is powered by the flow of mud during drilling, enabling real-time acquisition of downhole magnetic signals and transmission of surface data. This achieves the goal of measuring distance while drilling, eliminating the need for additional logging tools and the need for production shutdowns in adjacent wells, significantly improving operational efficiency and production continuity.

[0039] Meanwhile, the innovatively designed multi-chamber staged adjustable mud pump can automatically adjust the number of piston plates and the operating speed according to the drilling load to achieve dynamic matching of mud flow. Through the locking mechanism of the insert rod-insertion cylinder and synchronous rod between the cam assemblies, it ensures that the pistons move synchronously under high displacement conditions, avoids pressure fluctuations, and ensures stable fluid supply. With the help of the hydraulic adjustment mechanism, the eccentric mechanism of the pump chamber in the inactive position is placed in the lowest quadrant position to ensure force balance during start-up and shutdown and reduce impact. The overall solution realizes the automation, intelligence and high-efficiency power supply of the ranging process, which greatly improves the accuracy of drilling ranging and the reliability of the system under complex working conditions.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A downhole ranging device for parallel up and down wells, characterized in that: it comprises a power assembly, a drilling assembly and a measuring unit; the power assembly is arranged on a drilling platform (100); the drilling assembly is rotatably connected with the power assembly; the measuring unit is detachably connected with the drilling assembly; the measuring unit comprises a generator, a signal collector and a pulser; the generator is electrically connected with the signal collector and the pulser; when the power assembly drives mud to flow to the drilling assembly, the generator generates electricity to supply the signal collector to collect magnetic signals in the well, and then transmits the data to the pulser to return data to the well.

2. The downhole ranging device for parallel up and down wells according to claim 1, characterized in that: the power assembly comprises a mud pump (200); a plurality of pump cavities (210) arranged in a linear manner are formed in the mud pump (200); each pump cavity (210) is slidably connected with a piston plate (240); when the rotating torque, the rotating speed and / or the diving speed of the drilling assembly increase, a plurality of piston plates (240) start to slide in a linear direction; and when all the piston plates (240) slide, the mud flow can be further increased by increasing the sliding speed of the piston plates (240).

3. The downhole ranging device for parallel up and down wells according to claim 2, characterized in that: a first motor (300) is fixedly connected to the drilling platform (100); the output end of the first motor (300) is fixedly connected with a first rotating shaft (310); a cam assembly corresponding to each piston plate (240) is coaxially installed on the first rotating shaft (310); the cam assembly comprises two discs (260); an eccentric rod (270) is fixedly connected between the two discs (260); a connecting rod (250) is rotatably connected to the eccentric rod (270); and the other end of the connecting rod (250) is hingedly connected with the corresponding piston plate (240).

4. The downhole ranging device for parallel up and down wells according to claim 3, characterized in that: an insertion rod (340) and an insertion cylinder (330) are coaxially connected to each of the two discs (260) of each cam assembly; the insertion rod (340) of one of the two adjacent cam assemblies is inserted into the insertion cylinder (330) of the other cam assembly; a rotating seat (320) is fixedly connected to the drilling platform (100); and the insertion cylinder (330) is rotatably connected to the rotating seat (320).

5. The downhole ranging device for parallel up and down wells according to claim 4, characterized in that: a synchronous rod (350) is radially inserted into the insertion cylinder (330); when the synchronous rod (350) slides towards the insertion rod (340), the insertion rod (340) is locked in the insertion cylinder (330), so that the two adjacent cam assemblies rotate synchronously. ​ ​ ​ ​ ​ ​ ​ Two semicircular rings (370) are symmetrically and slidably connected on the rotating seat (320) in the radial direction, two first hydraulic rods (380) are symmetrically and fixedly connected on the drilling platform (100) in the radial direction of the rotating seat (320), the output ends of the two first hydraulic rods (380) are fixedly connected with crossbars (381), when the first hydraulic rods (380) are elongated, the two crossbars (381) respectively push the outer walls of the two semicircular rings (370), so that the two semicircular rings (370) are combined to push the synchronous rod (350) to abut against the inserting rod (340); A rolling ball (360) is installed at one end of the synchronous rod (350) away from the inserting rod (340), and a spring (361) is installed between the top end of the synchronous rod (350) and the outer wall of the inserting cylinder (330). 6.The up-and-down parallel well distance-measuring device while drilling according to claim 5, wherein: A second motor (400) is fixedly connected on the drilling platform (100), a second rotating shaft (430) is connected with the output end of the second motor (400), a plurality of gears (440) are installed on the second rotating shaft (430), the side walls of the two discs (260) of each cam assembly are provided with teeth that mesh with one of the gears (440), and when the plurality of piston plates (240) start to slide one after another, the plurality of gears (440) rotate one after another with the second rotating shaft (430). 7.The up-and-down parallel well distance-measuring device while drilling according to claim 6, wherein: A permanent magnet (441) is installed on the inner wall of the gear (440), an electromagnetic coil ring (450) that cooperates with the permanent magnet (441) is installed on the second rotating shaft (430), a rotor (460) that is electrically connected with the electromagnetic coil ring (450) is also installed on the second rotating shaft (430), the drilling platform (100) is installed with a stator (470) that cooperates with the rotor (460) through a support (471), and the stator (470) and the rotor (460) jointly form a current collecting ring assembly; The output end of the second motor (400) is connected with a driving tooth (410) through a one-way bearing, and the end of the second rotating shaft (430) is fixedly connected with an inner tooth ring (420) that meshes with the driving tooth (410), and when the number of operating cam assemblies increases, the output torque of the second motor (400) synchronously increases. 8.The up-and-down parallel well distance-measuring device while drilling according to claim 7, wherein: The mud pump (200) is fixedly connected with a plurality of second hydraulic rods (500) corresponding to the plurality of connecting rods (250), the output ends of the plurality of second hydraulic rods (500) are fixedly connected with mounting racks (510), the mounting racks (510) are rotatably connected with rollers (520), when the corresponding cam assemblies stop rotating, the corresponding second hydraulic rods (500) are elongated, so that the rollers (520) push the connecting rods (250) to swing, so that the eccentric rods (270) of the corresponding cam assemblies move to the lowest quadrant point position of the disc (260).

9. The up-and-down parallel well while-drilling ranging device according to claim 8, characterized in that: The drilling tool assembly comprises a rotary table (110), a drill pipe (120) and a drill bit (130); the rotary table (110) is arranged on the drilling platform (100); the drill pipe (120) is slidably connected with the rotary table (110); the drill bit (130) is arranged at the end of the drill pipe (120); the center of the drill pipe (120) and the drill bit (130) is provided with a mud hole (140) in communication with each other; the top of the drill pipe (120) is rotatably connected with a mud output pipe (230) in communication with the mud hole (140); the mud output pipe (230) is in communication with the mud pump (200).

10. A method of ranging while drilling a parallel up-and-down well comprising the ranging while drilling a parallel up-and-down well apparatus of any one of claims 1-9, wherein, The method comprises the following steps: S1: after the measuring unit is lowered into the well along with the drilling tool assembly, the mud pump (200) is started to prepare for ranging; S2: the mud flow of the mud pump (200) is automatically increased according to the drilling load; S3: the generator generates electricity by using mud to drive magnetic signal acquisition; S4: the measuring unit transmits the collected data to the ground through pulse; S5: the ranging is continuously cycled until the drilling is completed.

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