Real-time monitoring apparatus for coring recovery rate, and coring system
By using a real-time core recovery rate monitoring device to monitor the core length in real time, the problem of not being able to monitor the core recovery rate in real time in existing technologies has been solved. This enables visualization of the core recovery operation and efficient handling of core blockage, thereby improving the core recovery success rate.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2025-10-11
- Publication Date
- 2026-07-09
Smart Images
Figure CN2025127093_09072026_PF_FP_ABST
Abstract
Description
Real-time monitoring device for coring yield and coring system
[0001] Cross-references to related applications
[0002] This application claims the benefit of Chinese patent application 202411962970.X, filed on December 30, 2024, the contents of which are incorporated herein by reference. Technical Field
[0003] This invention relates to the field of well drilling coring technology, specifically to a real-time monitoring device for coring recovery rate. Furthermore, it relates to a coring system. Background Technology
[0004] In the process of oil and gas exploration and development, it is necessary to obtain stratigraphic data, such as stratigraphic properties and hydrocarbon content, in order to design targeted extraction plans. Stratigraphic data can be obtained through indirect or direct methods. Indirect methods mainly utilize geophysical logging, which measures the electrical and physical properties of the formation along the wellbore axis. This data is then analyzed by surface engineers to obtain the stratigraphic data. However, this indirect method is affected by many factors, including human error, resulting in generally low accuracy. Direct methods, on the other hand, typically use coring tools to obtain core samples from the target formation. This allows for direct acquisition of the target formation's characteristics, improving the accuracy of the conclusions drawn from these findings.
[0005] In coring operations, the core recovery rate is always a fundamental technical indicator, referring to the ratio of core length to coring footage. Currently, field engineers primarily rely on parameters such as drill pressure, torque, and suspended weight during the coring process, along with operational experience, to roughly estimate the core recovery rate. Because the implementation status of core entry, core insertion, and coring footage cannot be monitored in real time, especially in complex or loose formations, core blockage can easily occur. When blockage occurs, field engineers cannot accurately determine from the surface whether the underground coring tool has made any progress. In such cases, the core must be cut as quickly as possible to retrieve the coring tool from the surface, ending the coring operation and thus affecting the core recovery rate. Summary of the Invention
[0006] The purpose of this invention is to overcome the technical problem that the core harvest rate cannot be obtained in real time during the core harvesting process in the existing technology.
[0007] To achieve the above objectives, the present invention provides a real-time monitoring device for core recovery rate, comprising: a core sampling unit for extracting core samples from the formation; a real-time monitoring unit for monitoring the length data of the core samples extracted by the core sampling unit; and a display device disposed on the ground and signal-connected to the real-time monitoring unit; wherein the real-time monitoring unit includes a measuring component, a circuit component, and a pulse generating mechanism connected in sequence, the measuring component being connected to the core sampling unit and capable of measuring the length of the core samples extracted by the core sampling unit, the circuit component being capable of encoding the length data of the core samples and controlling the pulse generating mechanism to send fluid pulse signals to the display device, and the display device being configured to decode the fluid pulse signals and display them as the length data of the core samples.
[0008] Through the above technical solution, when the coring unit is performing coring operations in the target stratum, the real-time monitoring unit monitors the coring operation in real time. Specifically, the measurement component measures the length of the core extracted from the target stratum, and the circuit component encodes the length data measured by the measurement component. Simultaneously, the circuit component controls the pulse generator to send a fluid pulse signal to the display device on the ground based on the encoded signal. The display device receives the fluid pulse signal from the pulse generator, decodes it to obtain the core length data contained within the fluid pulse signal, and visualizes this length data. This allows ground coring personnel to monitor the underground coring process in real time and obtain the coring yield. If a core blockage occurs during coring, immediate measures can be taken to avoid complex situations such as empty cores or stuck drill bits, thereby improving the quality of coring operations.
[0009] In some embodiments, the core-taking unit includes an outer core cylinder and an inner core cylinder spaced apart to form an inner annulus. The core-taking unit also includes a drill bit connected to the end of the outer core cylinder, a core claw connected to the end of the inner core cylinder near the drill bit, and a core support ring slidably connected to the inner peripheral wall of the inner core cylinder. The core claw has an open state for core taking and a retracted state for core cutting.
[0010] In some embodiments, the core unit further includes a stop member disposed on the inner wall of the drill bit, one end of the stop member near the core inner cylinder abutting against the core claw, and the end is formed with an inclined surface. Along the direction from the core inner cylinder to the drill bit, the area of the channel cross section formed by the inclined surface gradually decreases, and the core claw can move along the inclined surface to switch between the open state and the contracted state.
[0011] In some embodiments, the measuring assembly includes a magnetic ring fixed to the inner circumferential wall of the core cylinder and a magnetic rod with one end connected to the core support ring. The other end of the magnetic rod passes through the magnetic ring. The overlapping portion of the radial projection of the magnetic ring and the radial projection of the magnetic rod can generate a strain pulse signal. The measuring assembly is configured to obtain the relative position of the overlapping portion of the projection on the magnetic rod through the strain pulse signal, so as to obtain the length of the core.
[0012] In some embodiments, the circuit assembly includes an outer cylinder and a control circuit disposed within the outer cylinder. The outer cylinder is connected to the end of the inner cylinder of the core sampler that is furthest from the core claw. The control circuit is capable of encoding the length data of the core and controlling the pulse generating mechanism to send the fluid pulse signal to the display device.
[0013] In some embodiments, the circuit assembly further includes a sealing plug that is sealed to one end of the outer cylinder of the circuit assembly near the inner cylinder of the core.
[0014] In some embodiments, the real-time monitoring device further includes an upper connector, one end of which is connected to the end of the outer core cylinder away from the drill bit, and the upper connector is capable of communicating with the inner annulus.
[0015] In some embodiments, the pulse generating mechanism includes a pulse assembly outer cylinder, a pulse generating assembly, and a throttling ring. One end of the pulse assembly outer cylinder is connected to the end of the circuit assembly outer cylinder away from the drill bit. The pulse generating assembly includes a pulse generating sub and a driving component. One end of the pulse generating sub is disposed inside the pulse assembly outer cylinder and is drivenly connected to the driving component. The driving component is electrically connected to the control circuit. The other end of the pulse generating sub extends out of the pulse assembly outer cylinder and forms a conical mushroom head. The throttling ring is disposed inside the upper connector and includes a first throttling orifice for fluid flow. The diameter of the mushroom head gradually increases in the direction close to the drill bit. The pulse generating assembly is configured such that after the driving component receives a control signal sent by the control circuit, it drives the pulse generating sub to move closer to or away from the throttling ring, thereby changing the flow area of the first throttling orifice.
[0016] In some embodiments, the first throttling orifice and the throttling ring are concentrically arranged, and the throttling ring further includes a second throttling orifice disposed radially outside the first throttling orifice. The second throttling orifice communicates with the inner annular cavity, and the flow area of the second throttling orifice is smaller than the flow area of the first throttling orifice.
[0017] In some embodiments, along the direction toward the drill bit, the drive component includes a first magnet, a return spring, and a second magnet connected in sequence. The second magnet is electrically connected to the control circuit. The second magnet is configured such that when the second magnet is energized with the control circuit, the first magnet is attracted by the magnetic force of the second magnet, causing the pulse generation segment to move away from the first throttling orifice and compress the return spring. When the second magnet is de-energized with the control circuit, the return spring drives the first magnet to move the pulse generation segment closer to the first throttling orifice, causing the mushroom head to block the first throttling orifice.
[0018] In some embodiments, the real-time monitoring device for core harvesting rate further includes a ball seat sleeved on the outer peripheral wall of the throttling ring, a ball-throwing device capable of blocking the flow channel of the ball seat, and a pin for connecting the ball seat to the upper connector. One end of the ball seat is connected to the end of the outer cylinder of the pulse assembly that is away from the outer cylinder of the circuit assembly. The pin is configured to be sheared when the ball-throwing device blocks the ball seat, causing the inner cylinder of the core harvesting device to move toward the drill bit.
[0019] In some embodiments, the real-time monitoring device for coring harvest rate further includes a sleeve fitted on the outer peripheral wall of the ball seat, the outer peripheral wall of the sleeve abutting against the inner peripheral wall of the upper connector, the sleeve and the ball seat respectively being provided with pin holes that can be aligned with each other, and the pin passing through the pin holes.
[0020] In some embodiments, the real-time monitoring device for coring harvest rate further includes a shock-absorbing component disposed in the inner cylinder of the coring chamber, the shock-absorbing component being able to reduce the vibration of the measuring component.
[0021] In some embodiments, the damping component includes a damping spring disposed between the magnetic ring and the core support ring.
[0022] In some embodiments, an axially penetrating pressure relief hole is formed on the core support ring. The pressure relief hole is configured such that when the core support ring moves closer to the magnetic ring, the fluid in the core inner cylinder moves away from the magnetic ring through the pressure relief hole.
[0023] In addition, the present invention also provides a coring system, including the aforementioned real-time monitoring device for coring harvest rate.
[0024] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0025] Figure 1 is a schematic diagram of the structure of the real-time monitoring device for coring harvest rate provided by the present invention;
[0026] Figure 2 is a schematic diagram of the pulse generation mechanism provided by the present invention;
[0027] Figure 3 is a cross-sectional view of the throttling ring provided by the present invention;
[0028] Figure 4 is a schematic diagram of the core claw provided by the present invention in an open state;
[0029] Figure 5 is a schematic diagram of the core claw provided by the present invention in a closed state;
[0030] Figure 6 is a cross-sectional view of the core claw provided by the present invention in a closed state;
[0031] Figure 7 is an enlarged view of part A in the real-time monitoring device for coring harvest rate shown in Figure 1. Detailed Implementation
[0032] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0033] In this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0035] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0037] In oil and gas exploration and development, coring operations on target formations yield rock cores. Analyzing the properties of these cores reveals the characteristics of the target formation, aiding in its subsequent development. During coring, coring tools are typically connected to the surface drilling rig via tubing, crisscross drill pipe, etc. These tools mainly include the coring bit and core barrel. When coring a target formation, the drilling rig drives the crisscross drill pipe, tubing, and coring bit to rotate. The coring bit drills into the target formation, allowing the rock to pass through and enter the core barrel, forming a rock core. After the coring bit has drilled the predetermined depth, the core is cut to separate it from the target formation. The coring tool is then retrieved from the wellhead, thus obtaining the rock core.
[0038] However, currently, when coring target formations, surface operators cannot observe the underground coring process. They can only roughly judge the coring yield based on changes in parameters such as drill pressure, torque, and suspended weight of the surface drilling rig, as well as the operators' field experience. Furthermore, because the derrick, tubing, and coring tool are rotating during coring, it is impossible to use conventional cables and sensor combinations to transmit underground coring data to the surface in real time. If the coring tool is connected to the surface display equipment via cable to transmit the underground core length data, the lack of connection to the drilling rig via tubing or derrick prevents the coring tool from generating sufficient drill pressure. This limits its application to small core samples, such as those taken from the wellbore, and makes it unsuitable for conventional coring operations.
[0039] This invention addresses the technical problem that existing conventional coring operations cannot monitor coring yield in real time, and provides a real-time coring yield monitoring device. Referring to Figure 1, the real-time coring yield monitoring device provided by this invention includes: a coring unit, a real-time monitoring unit, and a display device 1. The coring unit is used to extract rock cores 19 from the formation. The real-time monitoring unit is used to monitor the length data of the rock cores 19 extracted by the coring unit. The display device 1 is installed on the ground and is signal-connected to the real-time monitoring unit, and can be used to display the length data of the rock cores 19. The real-time monitoring unit includes a measuring component, a circuit component, and a pulse generating mechanism connected in sequence. The measuring component is connected to the coring unit and can measure the length of the rock cores 19 extracted by the coring unit. The circuit component can encode the length data of the rock cores 19 and control the pulse generating mechanism to send a fluid pulse signal to the display device 1. This fluid pulse signal includes the length information of the rock cores 19. The display device 1 is configured to decode the fluid pulse signal and display it as the length data of the rock cores 19.
[0040] In the real-time monitoring device for core recovery rate provided by this invention, the core sampling unit extracts core samples from the formation. During the core sampling process, the measuring component measures the length of the core sample 19 and saves the length data of the core sample 19 to the circuit component. The circuit component encodes the length data of the core sample 19 and controls the pulse generating mechanism to send a fluid pulse signal to the display device 1 on the ground according to the encoding. Since drilling fluid and other fluids circulate in the wellbore during the core sampling process, the fluid pulse signal can be transmitted to the ground through the drilling fluid and other fluids. The display device 1 can receive the fluid pulse signal, decode the fluid pulse signal to obtain the length data of the core sample 19, and visualize the length data of the core sample 19, so that the surface core sampling personnel can monitor the underground core sampling process in real time and obtain the core recovery rate.
[0041] Therefore, the real-time monitoring device for coring recovery rate provided by this invention allows coring engineers to visually observe the coring footage and coring recovery rate from the ground. Simultaneously, coring engineers can adjust drilling parameters such as drilling pressure based on the coring speed, further improving the success rate of coring. Moreover, this real-time monitoring device makes coring operations visible; when coring occurs, coring engineers can detect it immediately and take timely measures to avoid complex accidents such as empty casings and stuck drill bits, thus improving the quality of coring operations.
[0042] In some embodiments, referring to FIG1, the coring unit may include a coring outer cylinder 10, a coring inner cylinder 18, and a drill bit 21. The coring outer cylinder 10 and the coring inner cylinder 18 are spaced apart to form an inner annulus, and the coring outer cylinder 10 forms an outer annulus with the well wall. During coring, drilling fluid and other fluids circulate between the inner and outer annulus. The drill bit 21 is disposed at the end of the coring outer cylinder 10, and the coring inner cylinder 18 is connected to the drill bit 21. During coring, the drill bit 21 drills into the formation, allowing the rock of the formation to enter the coring inner cylinder 18 through the drill bit 21 to form a core 19. After coring is completed, the drill bit 21 can be directly retrieved to separate the core 19 from the formation, thus achieving core cutting. Alternatively, the core cutter 20 described below can be used to cut the core 19.
[0043] Further, as shown in Figure 1, the coring unit also includes a core claw 20 connected to the end of the inner cylinder 18 near the drill bit 21, and a core support ring 15 slidably connected to the inner circumferential wall of the inner cylinder 18. The core claw 20 has an open state for coring and a retracted state for cutting the core. During coring, the core claw 20 is in the open state, ensuring that the core 19 enters the inner cylinder 18 through the drill bit 21 and the core claw 20. After entering the inner cylinder 18, the core 19 abuts against the core support ring 15, which supports the core 19. The core support ring 15 includes, but is not limited to, components such as a piston. The core support ring 15 is slidably connected to the inner circumferential wall of the inner cylinder 18. As the core 19 continuously enters the inner cylinder 18, it pushes the core support ring 15 away from the drill bit 21. After coring is completed, the core claw 20 is controlled to be in the retracted state to cut the core 19. By using the core claw 20 for core cutting, the real-time monitoring device for core harvesting rate provided by this invention can meet the core harvesting requirements of different strata, such as coal seams, loose strata, and hard strata. The working method of the core claw 20 for different strata will be described in detail below.
[0044] In some embodiments, the opening and closing of the core claw 20 can be controlled by electrical or hydraulic means. Alternatively, according to an embodiment of the real-time monitoring device for core harvesting rate of the present invention, referring to Figures 4-6, the core unit further includes a stop member 33 disposed on the inner wall of the drill bit 21. One end of the stop member 33 near the core inner cylinder 18 abuts against the core claw 20, and this end forms an inclined surface. Along the direction from the core inner cylinder 18 to the drill bit 21, the area of the channel cross section formed by the inclined surface gradually decreases, and the core claw 20 can move along the inclined surface to switch between an open state and a closed state. Specifically, as shown in Figure 4, when the core claw 20 abuts against the end of the inclined surface of the stop component 33 away from the drill bit 21, the core claw 20 is in an open state, and the core 19 can enter the core-taking inner cylinder 18 through the drill bit 21 and the core claw 20; as the core claw 20 moves closer to the drill bit 21 on the inclined surface of the stop component 33, the core claw 20 gradually contracts. As shown in Figures 5 and 6, when the core claw 20 abuts against the end of the inclined surface near the drill bit 21 and the core claw 20 is in a contracted state, the core 19 is cut, thus separating the core 19 from the formation.
[0045] In some embodiments, the measuring component may include a potentiometer displacement measuring component, or in an embodiment of the real-time monitoring device for core harvesting rate according to the present invention, the measuring component may employ a magnetostrictive displacement measuring component. Specifically, referring to Figures 1 and 7, the measuring component includes a magnetic ring 13 fixed on the inner circumferential wall of the core inner cylinder 18 and a magnetic rod 14 with one end connected to the core support ring 15. The other end of the magnetic rod 14 passes through the magnetic ring 13. By energizing the magnetic ring 13 and the magnetic rod 14, the magnetic ring 13 and the magnetic rod 14 generate magnetic fields respectively. The magnetic field generated by the magnetic ring 13 and the magnetic field generated by the magnetic rod 14 are in different directions. The two different magnetic fields generate strain pulse signals at the intersection of the magnetic ring 13 and the magnetic rod 14, that is, at the overlapping part of the radial projection of the magnetic ring 13 and the radial projection of the magnetic rod 14. The measuring component obtains the relative position of the overlapping part of the projection on the magnetic rod 14 based on the strain pulse signal. During coring, as the core 19 gradually extends into the inner core cylinder 18, it pushes the core support ring 15 away from the drill bit 21. The core support ring 15 then moves the magnetic gauge rod 14 away from the drill bit 21, causing a change in the intersection position of the magnetic ring 13 and the magnetic gauge rod 14. The length of the core 19 is equivalent to the distance the magnetic gauge rod 14 moves due to the core support ring 15. Therefore, by continuously measuring the intersection position of the magnetic ring 13 and the magnetic gauge rod 14, the length of the core 19 can be obtained. The intersecting magnetic fields formed by the magnetic ring 13 and the magnetic gauge rod 14 simultaneously generate strain pulse signals to measure the length of the core 19. This allows the measuring assembly to be used in complex environments with high temperatures and pressures at the bottom of the well, while ensuring measurement accuracy.
[0046] In some embodiments, in order to improve the measurement accuracy of the measuring component, the real-time monitoring device for core harvest rate further includes a shock-absorbing component disposed in the core inner cylinder 18, which can reduce the vibration of the measuring component.
[0047] In some embodiments, referring to Figures 1 and 7, the damping component may include a damping spring 22 disposed between the magnetic ring 13 and the core support ring 15. The elastic deformation of the damping spring 22 can reduce the vibration generated by the measuring component during core sampling, thereby ensuring the accuracy of the measurement by the measuring component.
[0048] In some embodiments, continuing to refer to Figures 1 and 7, an axially penetrating pressure relief hole 23 is formed on the core support ring 15. The pressure relief hole 23 is configured such that when the core support ring 15 moves closer to the magnetic ring 13, the fluid in the core sampling inner cylinder 18 moves away from the magnetic ring 13 through the pressure relief hole 23. Specifically, during the process of the real-time monitoring device for core recovery rate of the present invention being lowered into the wellbore, the fluid in the wellbore can enter the core sampling inner cylinder 18 through the pressure relief hole 23, filling the core sampling inner cylinder 18 with fluid. When core sampling is performed, as the core support ring 15 moves closer to the magnetic ring 13, the fluid between the core support ring 15 and the magnetic ring 13 flows out of the core sampling inner cylinder through the pressure relief hole 23. Therefore, during the core sampling operation, there is fluid in the core sampling inner cylinder 18, which can dampen the vibration of the measuring component, thereby reducing the vibration generated by the measuring component and further ensuring the accuracy of the measurement by the measuring component.
[0049] In some embodiments, referring to FIG1, the circuit assembly includes a circuit assembly outer cylinder 7 and a control circuit 8 disposed inside the circuit assembly outer cylinder 7. The circuit assembly outer cylinder 7 is connected to the end of the core-taking inner cylinder 18 away from the core claw 20. The control circuit 8 can encode the length data of the core 19 and control the pulse generating mechanism to send a fluid pulse signal to the display device 1, thereby realizing real-time monitoring of the core harvest rate.
[0050] Further, as shown in Figure 1, the circuit assembly also includes a storage circuit 16 and a power supply component. The storage circuit 16 stores the length data of the core 19 measured by the measuring component. The control circuit 8 encodes the length data of the core 19 transmitted by the storage circuit 16 and controls the pulse generator to send a fluid pulse signal to the display device 1, thereby realizing real-time monitoring of the core recovery rate. The power supply component includes, but is not limited to, a battery 11. The battery 11 supplies power to the measuring component, storage circuit 16, control circuit 8, and pulse generator via a cable 17. A cable threader 9 is provided between the storage circuit 16 and the battery 11 for the cable 17 to pass through. It is understood that since the core recovery operation is generally short, using the battery 11 for power supply can meet the needs of downhole operations.
[0051] In some embodiments, referring to FIG1, the circuit assembly further includes a sealing plug 12, which is sealed to one end of the outer cylinder 7 of the circuit assembly near the core-taking inner cylinder 18, thereby preventing fluid in the core-taking inner cylinder 18 from entering the outer cylinder 7 of the circuit assembly and affecting the normal operation of the control circuit 8, storage circuit 16, etc.
[0052] In some embodiments, referring to FIG1, the real-time monitoring device further includes an upper connector 2. One end of the upper connector 2 is connected to the end of the outer core cylinder 10 away from the drill bit 21. The upper connector 2 is capable of communicating with the inner annulus. The upper connector 2 can be used to connect to the tubing string and angular drill pipe to connect the real-time core recovery rate monitoring device of the present invention to the surface drilling rig. The upper connector 2 is in communication with the inner annulus. The surface pump unit injects drilling fluid and other fluids through the angular drill pipe and tubing string into the inner annulus via the upper connector 2, enters the outer annulus through the drill bit 21, and circulates back to the surface.
[0053] In some embodiments, the pulse generating mechanism may include, but is not limited to, a positive pressure pulse generator and a negative pressure pulse generator. Alternatively, according to an embodiment of the real-time monitoring device for core harvesting rate of the present invention, referring to Figures 1 and 2, the pulse generating mechanism includes a pulse assembly outer cylinder 6, a pulse generating assembly 5, and a throttling ring 26. One end of the pulse assembly outer cylinder 6 is connected to the end of the circuit assembly outer cylinder 7 away from the drill bit 21. The pulse generating assembly 5 includes a pulse generating sub and a driving component. One end of the pulse generating sub is disposed inside the pulse assembly outer cylinder 6 and is drivenly connected to the driving component. The driving component is electrically connected to the control circuit 8. The other end of the pulse generating sub extends out of the pulse assembly outer cylinder 6 and forms a conical mushroom head 28. The throttling ring 26 is disposed inside the upper connector 2. For example, the outer wall of the throttling ring 26 abuts against the inner wall of the upper connector 2, or as shown in Figure 2, the outer wall of the throttling ring 26 abuts against the inner wall of the ball seat 4 described below. The ball seat 4 is disposed inside the upper connector 2. The throttling ring 26 includes a first throttling orifice 27 for fluid flow. Near the drill bit, the diameter of the mushroom head 28 gradually increases. The pulse generating component 5 is configured as a driving component to receive the control signal sent by the control circuit 8 and drive the pulse generating segment to move closer to or away from the throttling ring 26, changing the flow area of the first throttling orifice 27, thereby changing the pressure, flow rate, flow velocity and other parameters of the fluid passing through the first throttling orifice 27, thus forming a fluid pulse signal.
[0054] In some embodiments, referring to FIG3, the first throttling orifice 27 and the throttling ring 26 are concentrically arranged. The throttling ring 26 further includes a second throttling orifice 32 disposed radially outside the first throttling orifice 27. The second throttling orifice 32 communicates with the inner annulus, and the flow area of the second throttling orifice 32 is smaller than the flow area of the first throttling orifice 27. When the mushroom head 28 does not block the first throttling orifice 27, the flow area of the first throttling orifice 27 is larger than the flow area of the second throttling orifice 32, and the fluid flows mainly from the first throttling orifice 27 to the inner annulus. When the mushroom head 28 blocks the first throttling orifice 27, the fluid can flow from the second throttling orifice 32 to the inner annulus. Therefore, the second throttling orifice 32 disposed radially outside the first throttling orifice 27 can ensure that the fluid can always flow into the inner annulus, ensuring that the fluid circulates between the inner and outer annulus during the coring process.
[0055] In some embodiments, as shown in FIG2, the drive component along the direction toward the drill bit 21 includes a first magnet 29, a return spring 30, and a second magnet 31 connected in sequence. The second magnet 31 is electrically connected to the control circuit 8. The second magnet 31 is configured such that when the second magnet 31 is energized with the control circuit 8, the first magnet 29 is driven by the magnetic attraction of the second magnet 31 to move the pulse generation segment away from the first throttling orifice 27 and compress the return spring 30. When the second magnet 31 is de-energized with the control circuit 8, the return spring 30 releases its elastic energy to drive the first magnet 29 to move the pulse generation segment closer to the first throttling orifice 27, so that the mushroom head 28 blocks the first throttling orifice 27. Therefore, the control circuit 8 encodes the length data of the core 19 obtained by the measuring component, and controls the energization or de-energization of the second magnet 31 based on this encoded information. When the control circuit 8 is energized with the second magnet 31, the first magnet 29, under the magnetic attraction of the second magnet 31, drives the return spring 30 to move closer to the second magnet 31, causing the mushroom head 28 to flow into the first throttling orifice 27 while the return spring 30 compresses and stores elastic energy. When the control circuit 8 is de-energized with the second magnet 31, the return spring 30 releases its elastic energy, driving the first magnet 29 to move away from the second magnet 31, and causing the mushroom head to block the first throttling orifice 27. The control circuit 8 and the second magnet 31 continuously switch between energized and de-energized states, thereby causing changes in parameters such as pressure, flow rate, and flow velocity of the fluid as it passes through the throttling ring 26, thus generating a fluid pulse signal. When the fluid circulates back to the ground, the fluid pulse signal is transmitted to the ground. The fluid pulse signal can be received by ground sensors, such as pressure sensors, flow sensors or velocity sensors. The length data of core 19 can be obtained by decoding through display device 1, thereby visualizing the length data of core 19.
[0056] Of course, the driving components may also include components such as telescopic rods. The control circuit 8 controls the extension and retraction of the telescopic rods, thereby controlling the mushroom head 28 to move closer to or further away from the throttling ring 26.
[0057] In some embodiments, referring to Figures 1 and 2, the real-time monitoring device for core harvesting further includes a ball seat 4 sleeved on the outer peripheral wall of the throttling ring 26, a ball 3 capable of blocking the flow channel of the ball seat 4, and a pin 25 for connecting the ball seat 4 to the upper connector 2. One end of the ball seat 4 is connected to the end of the outer cylinder 6 of the pulse assembly that is away from the outer cylinder 7 of the circuit assembly. The pin 25 is configured to be sheared when the ball 3 blocks the ball seat 4, causing the inner core cylinder 18 to move toward the drill bit 21. Specifically, at the end of core harvesting, the ball 3 is thrown into the ball seat 4. The ball 3 falls onto the ball seat 4 and blocks the ball seat 4, preventing the fluid in the tubing from entering the inner annulus. The fluid pressure in the tubing continuously increases, causing the pin 25 to shear. At this time, the ball seat 4 sequentially pushes the outer cylinder 6 of the pulse assembly, the outer cylinder 7 of the circuit assembly, the inner core cylinder 18, and the core claw 20 toward the drill bit 21. Under the action of the stop component 33, the core claw 20 is in a contracted state, thereby completing the core cutting of the core 19. It should be noted that the aforementioned ball-throwing operation is typically a procedure required for coring loose strata or coal seams. The ball-throwing operation causes the core claw 20 to fully retract, gripping the loose core 19 and thus completing the core cutting. However, for conventional hard strata, the ball-throwing operation is unnecessary. In conventional hard strata coring, by lifting the entire coring string, for example by lifting the upper connector 2, the outer coring cylinder 10 and drill bit 21 move upwards. The stop component 33 of the drill bit 21 causes the core claw 20 to retract, thus gripping the core 19. Continuing to lift the coring string further eventually breaks the core 19, achieving the core cutting operation.
[0058] Furthermore, the real-time monitoring device for coring harvest rate also includes a sleeve 24 fitted onto the outer peripheral wall of the ball seat 4. The outer peripheral wall of the sleeve 24 abuts against the inner peripheral wall of the upper connector 2. The sleeve 24 and the ball seat 4 are respectively provided with pin holes that can be aligned with each other, and the pin 25 passes through the pin holes. By providing the sleeve 24 and opening pin holes on the sleeve 24, it is possible to avoid directly opening pin holes on the upper connector 2, thus ensuring the structural integrity and sealing of the upper connector 2.
[0059] In addition, the present invention also provides a coring system, which includes the aforementioned real-time monitoring device for coring harvest rate.
[0060] The following details one implementation method of the coring system of the present invention for coring loose strata.
[0061] Referring to Figures 1-7, connect the upper connector 2 to the drilling string. Using a surface drilling rig, lower the real-time core recovery monitoring device to the bottom of the well. Connect the drilling string to the angular drill pipe. Position the drill bit 21 1-2 meters from the bottom of the well. Circulate the drilling fluid through the inner and outer annulus. After at least one complete circulation, start the rotary table. The rotary table drives the angular drill pipe, drilling string, core casing 10, and drill bit 21 to rotate. Simultaneously, the drilling rig applies drilling pressure (DP) of 30-80 kN to the drill bit 21, allowing it to penetrate the formation and begin core sampling. During core sampling, maintain a uniform drilling speed for the drill bit 21. The flow rate of the drilling fluid pumped into the inner annulus is 12-24 L / s. The length data of the underground core 19 is transmitted to the surface at a frequency of 15 seconds per transmission. The core sampling engineer can visually observe the core recovery rate using a display device. Once the core recovery rate meets the requirements, for loose strata or coal seams, a ball-dropping operation is performed. A ball 3 is dropped into the ball holder 4, causing the core claw 20 to retract, thus completing the core cutting of the core 19. For conventional hard strata, the core extraction string is raised, and the stop component 33 of the drill bit 21 causes the core claw 20 to retract, thereby holding the core 19. The core extraction string continues to be raised, eventually breaking the core 19 and completing the core cutting operation. The core recovery rate real-time monitoring device is retrieved by the drilling rig, the inner core cylinder 18 is extracted, the core claw 20 is removed, and the core 19 is taken out from the inner core cylinder 18.
[0062] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.
Claims
1. A real-time monitoring device for coring harvest rate, characterized in that, include: A core sampling unit, which is used to extract rock cores (19) from the formation; A real-time monitoring unit is used to monitor the length data of the core (19) extracted by the coring unit; and, Driver display device (1), the driver display device (1) is installed on the ground and is connected to the real-time monitoring unit by signal; The real-time monitoring unit includes a measurement component, a circuit component, and a pulse generating mechanism connected in sequence. The measurement component is connected to the core sampling unit and can measure the length of the core (19) taken out by the core sampling unit. The circuit component can encode the length data of the core (19) and control the pulse generating mechanism to send a fluid pulse signal to the display device (1). The display device (1) is configured to decode the fluid pulse signal and display it as the length data of the core (19). The core sampling unit includes an outer core sampling cylinder (10) and an inner core sampling cylinder (18) that are spaced apart to form an inner annulus, and a core support ring (15) that is slidably connected to the inner peripheral wall of the inner core sampling cylinder (18). The measuring assembly includes a magnetic ring (13) fixed on the inner circumferential wall of the core cylinder (18) and a magnetic rod (14) with one end connected to the core support ring (15). The other end of the magnetic rod (14) passes through the magnetic ring (13). The overlapping portion of the radial projection of the magnetic ring (13) and the radial projection of the magnetic rod (14) can generate a strain pulse signal. The measuring assembly is configured to obtain the relative position of the overlapping projection portion on the magnetic rod (14) through the strain pulse signal, so as to obtain the length of the core (19). The real-time monitoring device for core harvest rate also includes a shock-absorbing component installed in the inner cylinder (18) of the core harvester, which can reduce the vibration of the measuring component.
2. The real-time monitoring device for coring harvest rate according to claim 1, characterized in that, The core-taking unit also includes a drill bit (21) connected to the end of the outer core-taking cylinder (10) and a core claw (20) connected to the end of the inner core-taking cylinder (18) near the drill bit (21). The core claw (20) has an open state for core taking and a retracted state for core cutting.
3. The real-time monitoring device for coring harvest rate according to claim 2, characterized in that, The core unit also includes a stop member (33) disposed on the inner wall of the drill bit (21). One end of the stop member (33) near the core inner cylinder (18) abuts against the core claw (20), and the end is formed with an inclined surface. Along the direction from the core inner cylinder (18) to the drill bit (21), the area of the channel cross section formed by the inclined surface gradually decreases. The core claw (20) can move along the inclined surface to switch between the open state and the contracted state.
4. The real-time monitoring device for coring harvest rate according to claim 2, characterized in that, The circuit assembly includes an outer cylinder (7) and a control circuit (8) disposed inside the outer cylinder (7). The outer cylinder (7) is connected to the end of the inner cylinder (18) away from the core claw (20). The control circuit (8) is capable of encoding the length data of the core (19) and controlling the pulse generating mechanism to send the fluid pulse signal to the display device (1).
5. The real-time monitoring device for coring harvest rate according to claim 4, characterized in that, The circuit assembly also includes a sealing plug (12) which is sealed to one end of the outer cylinder (7) of the circuit assembly near the inner cylinder (18).
6. The real-time monitoring device for coring harvest rate according to claim 4, characterized in that, The real-time monitoring device also includes an upper connector (2), one end of which is connected to the end of the core-taking outer cylinder (10) away from the drill bit (21), and the upper connector (2) is able to communicate with the inner annulus.
7. The real-time monitoring device for coring harvest rate according to claim 6, characterized in that, The pulse generating mechanism includes a pulse assembly outer cylinder (6), a pulse generating assembly (5), and a throttling ring (26). One end of the pulse assembly outer cylinder (6) is connected to the end of the circuit assembly outer cylinder (7) away from the drill bit (21). The pulse generating assembly (5) includes a pulse generating section and a driving component. One end of the pulse generating section is disposed inside the pulse assembly outer cylinder (6) and is drivenly connected to the driving component. The driving component is electrically connected to the control circuit (8). The other end of the pulse generating section extends out of the pulse assembly outer cylinder. The outer cylinder (6) of the component forms a conical mushroom head (28). The throttling ring (26) is disposed in the upper connector (2). The throttling ring (26) includes a first throttling orifice (27) for fluid flow. The diameter of the mushroom head (28) gradually increases in the direction close to the drill bit. The pulse generating component (5) is configured to drive the pulse generating segment to move closer to or away from the throttling ring (26) after the driving component receives the control signal sent by the control circuit (8), thereby changing the flow area of the first throttling orifice (27).
8. The real-time monitoring device for coring harvest rate according to claim 7, characterized in that, The first throttling orifice (27) is concentrically arranged with the throttling ring (26). The throttling ring (26) further includes a second throttling orifice (32) arranged radially outside the first throttling orifice (27). The second throttling orifice (32) is in communication with the inner annular cavity. The flow area of the second throttling orifice (32) is smaller than the flow area of the first throttling orifice (27).
9. The real-time monitoring device for coring harvest rate according to claim 7, characterized in that, Along the direction toward the drill bit (21), the drive component includes a first magnet (29), a return spring (30), and a second magnet (31) connected in sequence. The second magnet (31) is electrically connected to the control circuit (8). The second magnet (31) is configured such that when the second magnet (31) is energized with the control circuit (8), the first magnet (29) is driven by the magnetic attraction of the second magnet (31) to move the pulse generating segment away from the first throttle orifice (27) and compress the return spring (30). When the second magnet (31) is de-energized with the control circuit (8), the return spring (30) drives the first magnet (29) to move the pulse generating segment closer to the first throttle orifice (27), so that the mushroom head (28) blocks the first throttle orifice (27).
10. The real-time monitoring device for coring harvest rate according to claim 7, characterized in that, The real-time monitoring device for core harvesting rate also includes a ball seat (4) sleeved on the outer peripheral wall of the throttling ring (26), a ball-throwing device (3) capable of blocking the flow channel of the ball seat (4), and a pin (25) for connecting the ball seat (4) to the upper connector (2). One end of the ball seat (4) is connected to the end of the outer cylinder (6) of the pulse assembly that is away from the outer cylinder (7) of the circuit assembly. The pin (25) is configured to be sheared when the ball-throwing device (3) blocks the ball seat (4), so that the inner cylinder (18) of the core harvesting device moves toward the drill bit (21).
11. The real-time monitoring device for coring harvest rate according to claim 10, characterized in that, The real-time monitoring device for core harvesting rate also includes a sleeve (24) fitted on the outer peripheral wall of the ball seat (4). The outer peripheral wall of the sleeve (24) abuts against the inner peripheral wall of the upper connector (2). The sleeve (24) and the ball seat (4) are respectively provided with pin holes that can be aligned with each other, and the pin (25) passes through the pin holes.
12. The real-time monitoring device for coring harvest rate according to claim 1, characterized in that, The damping component includes a damping spring (22) disposed between the magnetic ring (13) and the core support ring (15).
13. The real-time monitoring device for coring harvest rate according to claim 1, characterized in that, The core support ring (15) has an axially penetrating pressure relief hole (23). The pressure relief hole (23) is configured such that when the core support ring (15) moves close to the magnetic ring (13), the fluid in the core inner cylinder (18) moves away from the magnetic ring (13) through the pressure relief hole (23).
14. A core extraction system, characterized in that, Includes the real-time monitoring device for coring harvest rate according to any one of claims 1-13.