Direction-variable guide cone
By designing a variable-directional guide cone, the coordination of the eccentric cone surface joint and the guide cone body is used to solve the problem of logging difficulties caused by the step stay of the guide cone, the smooth downward flow of the instrument string and the successful logging are achieved, and the construction is simplified process and reduce costs.
Patent Information
- Application Number
- CN202420632995.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-29
AI Technical Summary
During the oil field production logging process, the guide cone fixed at the tail of the instrument string is likely to stay due to the steps in the wellbore, resulting in logging failure, making it difficult to go down the well and time-consuming.
A variable direction guide cone is designed, using an eccentric cone joint and a guide cone body. Through the coordination between the cylindrical head and the eccentric hole and the return spring, the guide cone body changes eccentrically when it encounters a step and slides over the step. And through the rebound force, the instrument string is restored to ensure smooth downward.
Through the mobility of the guide cone and the spring rebound force, the smooth downward flow of the instrument string when encountering the steps in the wellbore is achieved, simplifying the construction process and saving logging costs.
Smart Images
Figure CN222141230U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of guide cones, in particular to a guide cone with variable direction. Background Art
[0002] At present, when logging instruments are lowered into the wells of major oil fields in my country, the guide cone at the bottom of the instrument is generally fixed at the tail of the instrument string. The annular wellbore is corroded by chemical and physical substances such as oil, gas, water, sulfuric acid, and hydrochloric acid for a long time, and the oil casing is connected by couplings to form steps, which makes the passage for lowering the instrument string in the wellbore narrower, making it difficult to lower the instrument string into the well, especially when encountering steps in inclined wells. Due to the large friction resistance of the well wall, the instrument string is lowered slowly, and sometimes the guide cone at the tail of the instrument string stops directly on the coupling. After the instrument string is raised for a distance and then lowered, the guide cone still stops at the step, and the instrument string cannot continue to be lowered, resulting in logging failure, time-consuming and labor-intensive work, and difficulty in lowering the well. Utility Model Content
[0003] In order to solve the above-mentioned problem that the guide cone is fixed at the tail of the instrument string and stops when encountering a step, the utility model provides a guide cone with variable direction.
[0004] In order to achieve the above functions, the technical solution adopted by the utility model is as follows: a variable-direction guide cone, comprising an eccentric cone surface joint and a guide cone body, the bottom of the eccentric cone surface joint is provided with an eccentric hole, the top of the guide cone body is provided with a cylindrical head, the cylindrical head is centrally connected to the eccentric hole, a return spring is connected between the eccentric cone surface joint and the guide cone body, and during the process of the logging instrument being lowered into the well, when the guide cone body at the bottom of the instrument string encounters a step in the wellbore and encounters an obstacle, since the guide cone body is movable, one end of the cylindrical head of the guide cone body is pressed into the bottom of the eccentric hole of the eccentric cone surface joint, causing the guide cone body to eccentrically change direction, and the instrument string will slide over the step and continue to descend. At the same time, due to the resilience of the return spring, the changed-direction guide cone body will return to its position and be centered. This process is repeated, and the instrument string can smoothly descend to the target layer to complete the logging.
[0005] As a preferred technical solution of the utility model, a distance is left between the cylindrical head and the bottom of the eccentric hole.
[0006] Compared with the prior art, the utility model adopts the above structure to achieve the following beneficial effects: the guide cone body is movably connected to the eccentric hole of the eccentric cone surface joint. During the process of lowering the logging instrument into the well, when the guide cone body at the bottom of the instrument string encounters a step in the wellbore, since the guide cone body is movable, one end of the cylindrical head of the guide cone body is pressed into the bottom of the eccentric hole of the eccentric cone surface joint, causing the guide cone body to eccentrically change direction, and the instrument string will slide over the step and continue to descend. At the same time, due to the rebound force of the return spring, the changed guide cone body will return to its position and be centered. This process is repeated, and the instrument string can be smoothly lowered to the target layer to complete the logging, which greatly simplifies the construction process and saves the logging cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 This is a schematic diagram of the overall structure of a variable-direction guide cone proposed by the utility model;
[0008] Figure 2 The utility model discloses a guide cone body of a guide cone with variable direction.
[0009] Among them, 1. eccentric cone joint, 2. guide cone body, 3. eccentric hole, 4. cylindrical head, 5. return spring. DETAILED DESCRIPTION
[0010] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0011] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. The present utility model is further described in detail below in conjunction with the accompanying drawings.
[0012] like Figure 1-2 As shown, the utility model provides a variable-direction guide cone, including an eccentric cone surface joint 1 and a guide cone body 2. The bottom of the eccentric cone surface joint 1 is provided with an eccentric hole 3, and the top of the guide cone body 2 is provided with a cylindrical head 4, which is centrally connected to the eccentric hole 3, and a distance is left between the cylindrical head 4 and the bottom of the eccentric hole 3. A return spring 5 is connected between the eccentric cone surface joint 1 and the guide cone body 2. During the downhole process of the logging instrument, when the guide cone body 2 at the bottom of the instrument string encounters a step in the wellbore and encounters resistance, since the guide cone body 2 is movable, one end of the cylindrical head 4 of the guide cone body 2 is pressed into the bottom of the eccentric hole 3 of the eccentric cone surface joint 1, so that the guide cone body 2 is eccentrically changed in direction, and the instrument string will slide over the step and continue to descend. At the same time, due to the resilience of the return spring 5, the changed-direction guide cone body 2 is returned and centered. This is repeated, and the instrument string can smoothly go down to the target layer to complete the logging.
[0013] During specific use, when the logging instrument is lowered into the well, when the guide cone body 2 at the bottom of the instrument string encounters a step in the wellbore, since the guide cone body 2 is movable, one end of the cylindrical head 4 of the guide cone body 2 is pressed into the bottom of the eccentric hole 3 of the eccentric cone joint 1, causing the guide cone body 2 to eccentrically change direction, and the instrument string will slide over the step and continue to descend. At the same time, due to the rebound force of the return spring 5, the changed guide cone body 2 will return to its position and be centered. This process is repeated, and the instrument string can be smoothly lowered to the target layer to complete the logging.
[0014] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.
Claims
1. A variable-direction guide cone, comprising an eccentric cone surface joint (1) and a guide cone body (2), characterized in that: An eccentric hole (3) is provided at the bottom of the eccentric cone joint (1), a cylindrical head (4) is provided at the top of the guide cone body (2), the cylindrical head (4) is centrally connected to the eccentric hole (3), and a return spring (5) is connected between the eccentric cone joint (1) and the guide cone body (2).
2. A variable-direction guide cone according to claim 1, characterized in that: A distance is left between the cylindrical head (4) and the bottom of the eccentric hole (3).