A soft formation wireline coring tool
By using a rope coring tool for soft geological conditions, and employing a hopper design that combines rope connections and a bidirectional telescopic motor, the problem of core loss and fragmentation in soft geological conditions has been solved, enabling the sampling of intact cores and efficient coring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU DINGYUAN PETROLEUM ENG TECH SERVICE CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-19
AI Technical Summary
Existing core sampling techniques are prone to core loss or detachment in soft geological conditions, resulting in low recovery rates. Furthermore, cores are easily broken during drilling, making it difficult to obtain complete blocky cores.
The core sampling tool, which uses soft geological ropes, includes an outer wall cylinder, a rotary drill bit, a rotary motor, a core collection device, and a core sampling device. The core is sampled non-destructively through rope connections. The combined action of the bidirectional telescopic motor and the core collection funnel ensures that the core does not fall off or get lost during the core sampling process.
This technology enables the acquisition of complete columnar cores in soft geological conditions, improving the core recovery rate, reducing the damage to the cores caused by mechanical vibration, and enhancing work efficiency.
Smart Images
Figure CN224382856U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of geological exploration, and specifically relates to a coring tool for soft geological ropes. Background Technology
[0002] After hard rocks have undergone geological processes such as erosion, transportation and deposition, loose sediments are formed because they have not yet consolidated and hardened into lithology. These loose sediments are called loose layers. Because loose layers are formed in different environments, times and places, they will have different properties. Core taking refers to the process of taking rock samples from the drilled strata in order to understand the geological conditions of the strata.
[0003] Currently, existing coring techniques are prone to core loss or detachment from the coring tool during practical applications, resulting in low recovery rates (e.g., below 50%), which affects the representativeness of the formation. Furthermore, the core is easily broken by mechanical disturbance during drilling, making it difficult to obtain complete blocky cores. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] In view of the above-mentioned technical problems, this utility model provides a rope coring tool for soft geological conditions, which will not detach or be lost when coring in soft geological conditions, and can obtain complete columnar rock cores.
[0006] (II) Technical Solution
[0007] This utility model provides a coring tool for soft geological conditions, including an outer wall cylinder, a rotary drill bit, a rotary motor, a core storage device, and a coring device. The rotary drill bit is installed at the bottom of the outer wall cylinder, the rotary motor is installed at the top of the outer wall cylinder, the core storage device is slidably installed inside the outer wall cylinder, and the coring device is installed on the side of the outer wall cylinder above the rotary drill bit. The rotary motor and the core storage device are connected by a rope.
[0008] In some embodiments of this utility model, the core-collecting device includes a sliding support plate, a bidirectional telescopic motor, a rock-collecting funnel, a first connecting spring, and a connecting plate. The sliding support plate is fixedly installed inside the outer wall cylinder, the bidirectional telescopic motor is fixedly installed at the center of the sliding support plate, the rock-collecting funnel is slidably installed on the sliding support plate, and there are two rock-collecting funnels. Each rock-collecting funnel has a connecting plate on its side. The bidirectional telescopic motor is connected to the two sets of rock-collecting funnels through a telescopic rod, and the two connecting plates are connected by the first connecting spring.
[0009] In some embodiments of this utility model, the core collection device includes a sliding fixed plate, a sliding support rod, a fixed connecting plate, a second connecting spring, and a core collection groove. The sliding fixed plate is connected to a rotary motor via a rope. The sliding fixed plate is slidably installed inside the outer wall cylinder. The sliding support rod is slidably installed at the bottom of the sliding fixed plate. The fixed connecting plate is fixedly installed at the bottom of the sliding support rod. There are two fixed connecting plates, and a second connecting spring is provided between the two fixed connecting plates. The bottom of the fixed plate is provided with a core collection groove, and the shape and size of the core collection groove match the core collection funnel.
[0010] In some embodiments of this utility model, the outer wall of the rock collecting funnel adopts an arc-shaped structure that matches the outer wall of the outer cylinder.
[0011] In some embodiments of this utility model, a limiting pin is provided inside the outer wall cylinder below the sliding fixing plate.
[0012] In some embodiments of this utility model, the bottom width of the rotary drill bit is greater than the width of the outer wall cylinder, and the distance between the two core sampling devices after the core sampling device slides from the inside of the outer wall cylinder to the outside is greater than the bottom width of the rotary drill bit.
[0013] (III) Beneficial Effects
[0014] As can be seen from the above technical solution, this utility model has at least one of the following beneficial effects:
[0015] (1) When the core sampling depth is reached, the rotary drill bit stops rotating and descends. The rock collection funnel in the core sampling device extends outward from the inside of the outer wall cylinder under the action of the bidirectional telescopic motor. During the outward extension of the rock collection funnel, the outer wall cylinder moves upward, thereby realizing the core sampling work of the rock collection funnel. In the core sampling process, this invention effectively reduces the defect of poor core sampling effect caused by mechanical vibration. The final core obtained is a complete block core. Moreover, since the core sampling tool adopts the bottom-up core sampling method, the core falls into the inside of the rock collection funnel, which will not cause the core to fall off or be lost. After the core sampling is completed, the first connecting spring pulls the two core sampling devices into the outside wall cylinder based on the connecting plate.
[0016] (2) Before the rock collecting funnel extends to the outside of the outer wall cylinder, the core collecting trough in the core collecting device is attached to the inside of the rock collecting funnel. When the rock collecting funnel extends to the outside of the outer wall cylinder, the core collecting trough is also driven to extend to the outside of the outer wall cylinder. At this time, the second connecting spring between the two fixed connecting plates is stretched, the sliding support rod slides at the bottom of the sliding fixed plate, and the two fixed connecting plates separate. When the rock collecting funnel slides from the outside of the outer wall cylinder to the inside, the two fixed connecting plates are reset, the rotating motor rotates the collecting rope to bring the core collecting trough under the sliding fixed plate away from the outer wall cylinder to complete the core sampling operation. This utility model can realize the underground rock core sampling work without lifting out the outer wall cylinder, and the work efficiency is effectively improved. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the internal structure of this utility model.
[0018] Figure 2 Schematic diagram of core collection device and core sampling device
[0019] [Explanation of symbols for main components of this utility model]
[0020] 1. Outer wall casing; 2. Rotary drill bit; 3. Core storage device;
[0021] 4. Core-taking device; 5. Limiting pin; 3-1 Sliding fixing plate;
[0022] 3-2. Sliding support rod; 3-3. Fixed connecting plate; 3-4. Second connecting spring; 3-5. Core collection trough; 4-1. Sliding support plate; 4-2. Bidirectional telescopic motor; 4-3. Rock collecting funnel; 4-4. First connecting spring; 4-5. Connecting plate. Detailed Implementation
[0023] This utility model provides a coring tool for soft geological ropes. To make the purpose, technical solution and advantages of this utility model clearer, the following describes this utility model in further detail with reference to specific embodiments and accompanying drawings. Specific Implementation
[0025] like Figure 1 , 2As shown, this utility model provides a coring tool for soft geological ropes, including an outer wall cylinder 1, a rotary drill bit 2, a rotary motor, a core collection device 3, and a coring device 4. The rotary drill bit 2 is installed at the bottom 1 of the outer wall cylinder, the rotary motor is installed at the top of the outer wall cylinder 1, the core collection device 3 is slidably installed inside the outer wall cylinder 1, and the coring device 4 is installed on the side of the outer wall cylinder 1 above the rotary drill bit 2. The coring device 4 includes a sliding support plate 4-1, a bidirectional telescopic motor 4-2, a rock collection funnel 4-3, and a first connecting spring 4-4. The sliding support plate 4-1 is fixedly installed inside the outer wall cylinder 1, and the bidirectional telescopic motor 4-2 is fixedly installed at the center of the sliding support plate 4-1. Two rock-collecting funnels 4-3 are slidably installed on the sliding support plate 4-1, and each funnel 4-3 has a connecting plate 4-5 on its side. The outer wall of the rock-collecting funnel 4-3 adopts an arc-shaped structure matching the outer wall of the outer wall cylinder 1. The bidirectional telescopic motor 4-2 is connected to the two sets of rock-collecting funnels 4-3 via a telescopic rod. The two connecting plates 4-5... The components 5 are connected by a first connecting spring 4-4; the core storage device 3 includes a sliding fixing plate 3-1, a sliding support rod 3-2, a fixed connecting plate 3-3, a second connecting spring 3-4, and a core storage groove 3-5. The sliding fixing plate 3-1 is connected to the rotary motor via a rope. The sliding fixing plate 3-1 is slidably installed inside the outer wall cylinder 1. A limiting pin 5 is provided inside the outer wall cylinder 1 below the sliding fixing plate 3-1. The sliding support rod 3-2 is slidably installed at the bottom of the sliding fixing plate 3-1. The fixed connecting plate 3-3 is fixedly installed. At the bottom of the sliding support rod 3-2, there are two fixed connecting plates 3-3, and a second connecting spring 3-4 is provided between the two fixed connecting plates 3-3. The bottom of the fixed connecting plate 3-3 is provided with a core collection groove 3-5. The shape and size of the core collection groove 3-5 match the core collection funnel 4-3. The bottom width of the rotary drill bit 2 is greater than the width of the outer wall cylinder 1. After the core sampling device 4 slides from the inside of the outer wall cylinder 1 to the outside, the distance between the two core sampling devices 4 is greater than the bottom width of the rotary drill bit 2. The rotary motor is connected to the core collection device 3 by a rope.
[0026] Working principle
[0027] During the process of the bidirectional telescopic motor 4-2 in the core-collecting device 2 pushing the rock-collecting funnel 4-3 to slide to the outside of the outer wall cylinder 1, the outer wall cylinder 1 moves upward, causing the rock-collecting funnel 4-3 to move upward. The rock core falls into the rock core storage groove 3-5 in the rock core storage device 3. Then, the rock-collecting funnel 4-3 is pulled to the initial position inside the outer wall cylinder 1 by the first connecting spring 4-4, the second connecting spring 3-4, and the bidirectional telescopic motor 4-2. At this time, the rotating motor rotates and pulls the rock core in the rock core storage device 3 out of the outer wall cylinder 1, thus completing the core-collecting work. After the core-collecting is completed, the rock core storage device 3 is put back into the outer wall cylinder 1. The rotating motor rotates in the opposite direction to release the rope. The rock core storage device 3 slides downward under the action of gravity, and the rock core storage groove 3-4 falls back into the rock-collecting funnel 4-3.
[0028] This concludes the detailed description of the embodiment with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present invention.
[0029] It should be noted that implementations not shown or described in the accompanying drawings or the main text of the specification are all forms known to those skilled in the art and are not described in detail. Furthermore, the definitions of the elements and methods described above are not limited to the various specific structures, shapes, or methods mentioned in the embodiments.
[0030] It should also be noted that this document provides examples of parameters containing specific values, but these parameters need not be exactly equal to the corresponding values, but can approximate the corresponding values within acceptable error tolerances or design constraints. Directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the accompanying drawings and are not intended to limit the scope of protection of this utility model. Furthermore, unless specifically described or steps must occur in sequence, the order of the above steps is not limited to those listed above and can be varied or rearranged according to the desired design. Moreover, the above embodiments can be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments.
[0031] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A soft formation wireline coring tool, comprising: The device includes an outer cylinder, a rotary drill bit, a rotary motor, a core storage device, and a core sampling device. The rotary drill bit is installed at the bottom of the outer cylinder, the rotary motor is installed at the top of the outer cylinder, the core storage device is slidably installed inside the outer cylinder, and the core sampling device is installed on the side of the outer cylinder above the rotary drill bit. The rotary motor and the core storage device are connected by a rope.
2. A soft formation wireline coring tool as defined in claim 1, wherein, The core-collecting device includes a sliding support plate, a bidirectional telescopic motor, a rock-collecting funnel, a first connecting spring, and a connecting plate. The sliding support plate is fixedly installed inside the outer wall cylinder. The bidirectional telescopic motor is fixedly installed at the center of the sliding support plate. The rock-collecting funnel is slidably installed on the sliding support plate. There are two rock-collecting funnels. Each rock-collecting funnel has a connecting plate on its side. The bidirectional telescopic motor is connected to the two sets of rock-collecting funnels through a telescopic rod. The two connecting plates are connected by the first connecting spring.
3. A soft formation wireline coring tool as defined in claim 2, wherein, The core collection device includes a sliding fixed plate, a sliding support rod, a fixed connecting plate, a second connecting spring, and a core collection trough. The sliding fixed plate is connected to a rotary motor via a rope. The sliding fixed plate is slidably installed inside the outer wall cylinder. The sliding support rod is slidably installed at the bottom of the sliding fixed plate. The fixed connecting plate is fixedly installed at the bottom of the sliding support rod. There are two fixed connecting plates, and a second connecting spring is provided between the two fixed connecting plates. The bottom of the fixed plate is provided with a core collection trough, the shape and size of which match the core collection funnel.
4. A soft formation wireline coring tool as defined in claim 2, wherein, The outer wall of the rock-collecting funnel adopts an arc-shaped structure that matches the outer wall of the outer cylinder.
5. A soft formation wireline coring tool as defined in claim 3, wherein, A limiting pin is provided inside the outer wall cylinder below the sliding fixing plate.
6. A coring tool for soft geological ropes according to claim 1, characterized in that, The bottom width of the rotary drill bit is greater than the width of the outer cylinder, and the distance between the two core sampling devices after the core sampling device slides from the inside of the outer cylinder to the outside is greater than the bottom width of the rotary drill bit.