Cable descending guide frame for electric spark source micro-logging
By designing a cable guide for micro-logging of electric spark source, the problems of poor data quality, easy equipment damage, high electric shock risk and high labor intensity when cable handles are sent to the well, and the stability of cables and workers' safety are achieved.
Patent Information
- Application Number
- CN202421317939.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-11
AI Technical Summary
In the construction of micro-logging of electric spark source, when cable handles are sent up and down the well, it is easy to lead to poor data quality, easy equipment damage, high risk of workers' electric shock and high labor intensity.
A cable downhole guide frame is designed, including a fixed bracket and a rubber wheel rotatably connected to the fixed bracket. A cable limit groove is arranged in the middle of the outer peripheral surface of the rubber wheel in the circumferential direction to ensure that the cable is stable in the middle of the well during the downhole process.
By using guide brackets, poor data quality and equipment damage caused by cable swing are solved, the risk of electric shock and labor intensity of workers is reduced, and the safety and efficiency of field operations are ensured.
Smart Images
Figure CN222654685U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of petroleum geophysical prospecting, and relates to a cable downhole tool used in field electric spark source micro-well logging construction, specifically a guide frame which is convenient for cable retraction and extension. Background Art
[0002] In recent years, a new type of excitation source has been developed in the field of micro-well logging construction - electric spark excitation. Its advantage is that it does not use detonators, does not need to consider the use and safety of civil explosives, and can also provide reliable surface data. It has been widely promoted and applied.
[0003] The spark excitation source is pulled down into the well by a cable. Due to the imperfect and immature supporting equipment and facilities, in most cases, the cables are carried up and down the well by workers. This often leads to the following problems:
[0004] One is that the data quality is poor and related equipment is easily damaged. Workers carry the cables up and down the well by hand, and they cannot fix the cables well during the process, which will cause the cables to swing in an unfixed direction. It is impossible to ensure that the spark probe is in the middle of the well, which is easy to cause scratches on the well wall and cause foreign objects to fall into the well. The back and forth swinging of the cable and the foreign objects falling into the well will cause random interference to the collected data, causing the data to deteriorate. In addition, the back and forth swinging of the cable will cause related equipment (such as the spark probe) to be damaged by colliding with the well wall, or get stuck somewhere on the well wall and cannot be further operated to lift or lower it. The result is often that the cable is pulled off and the related equipment is abandoned in the well, causing economic losses.
[0005] The second is that workers are at high risk of electric shock and have high labor intensity. Electromagnetic induction often exists in the construction of electric spark source micro-well logging, which can lead to poor data appearance and inaccurate pickup of the detector start-up time, affecting the accuracy of the data. Most importantly, electromagnetic induction is a safety hazard for workers who carry and send cables up and down the well by hand, and there is a risk of electric shock. In addition, the labor intensity of workers carrying and sending cables up and down the well by hand is also relatively high. Utility Model Content
[0006] The utility model provides a cable downhole guide frame for electric spark source micro-well logging, which aims to solve the problem of poor data quality caused by cable drift, eliminate the safety risk of electric shock during construction, and reduce the labor intensity of workers.
[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a cable downhole guide frame for electric spark source micro-logging, including a fixed bracket and a rubber pulley rotatably connected to the fixed bracket; the fixed bracket includes a base and a first pillar and a second pillar relatively fixed on the base, wherein the base is provided with a through hole whose size is larger than the wellbore; a cable limiting groove is opened in the middle of the outer peripheral surface of the rubber pulley along the circumferential direction.
[0008] As a limitation of the present invention, both sides of the first pillar and both sides of the second pillar are fixedly provided with reinforcing rods connected to the base.
[0009] As a further limitation of the present invention, the base, the first pillar, the second pillar and the reinforcing rod are all made of iron.
[0010] As another limitation of the present invention, aluminum slips are provided on both sides of the rubber pulley, and the slip diameter is greater than or equal to the end face diameter of the rubber pulley.
[0011] As a further limitation of the present invention, the rubber wheel and the slips are rotatably connected between the first support column and the second support column through a bearing.
[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:
[0013] The utility model has a reasonable design and simple structure and operation. By designing an insulated rubber pulley to guide the cable, it can ensure that the cable is stable in the middle of the well when going up and down the well, overcoming the problems of poor data quality and easy damage to the equipment caused by the swing of the cable during the construction of the electric spark source micro-well logging. In addition, there is no need for workers to carry or lift the cable in the wellbore, which reduces the labor intensity of the workers, and completely solves the risk of high-voltage electric shock in the electric spark source logging, ensuring the safety of the field operation team. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;
[0016] In the figure: 1. base; 2. first pillar; 3. second pillar; 4. reinforcing rod; 5. through hole; 6. rubber wheel; 7. cable limit groove; 8. bearing; 9. slip; 10. cable. DETAILED DESCRIPTION
[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.
[0018] The present embodiment discloses a cable downhole guide frame, which is used in the construction of electric spark source micro-well logging, and comprises a fixed bracket and a rubber pulley 6 rotatably connected to the fixed bracket.
[0019] Specific as Figure 1 As shown, the fixed bracket includes a base 1, a first support 2, a second support 3 and a reinforcing rod 4. The base 1 is a rectangular plate-like structure with a rectangular through hole 5 in the middle. The size of the through hole 5 is larger than the size of the wellbore, so that after the fixed bracket is placed on the wellbore, the cable 10 can pass through the through hole 5 and be vertically lowered into the wellbore. The first support 2 and the second support 3 are symmetrically fixed on the base 1 to form a structure for mounting a rubber wheel 6. The reinforcing rod 4 includes four, which are respectively fixed on both sides of the first support 2 and the second support 3, and form the first support 2 and the second support 3 as shown in FIG. Figure 1 The tripod structure shown is used to strengthen the connection between the first support 2 and the base 1 , and between the second support 3 and the base 1 .
[0020] In this embodiment, the base 1, the first support 2, the second support 3 and the reinforcing rod 4 are all made of iron and have a certain weight to ensure the stability of the cable 10 during the process of being lowered into the well.
[0021] The rubber wheel 6 is a cylinder. In this embodiment, the cross-sectional diameter of the rubber wheel 6 is 30 cm, the length of the cylinder is 50 cm, and the weight is 1.5 kg. The two ends of the rubber wheel 6 are assembled between the first support 2 and the second support 3 through bearings 8, and can rotate. Figure 1 As shown, a cable limit groove 7 is axially provided in the middle of the outer peripheral surface of the rubber pulley 6. The width of the cable limit groove 7 is slightly larger than the diameter of the cable 10, which can ensure the stability of the cable 10 during the downhole process and avoid drift. In this embodiment, the width of the cable limit groove 7 is 25 mm. In actual application, the surface of the cable limit groove 7 can be polished smooth or sprayed with a coating to reduce friction resistance.
[0022] Furthermore, in this embodiment, slips 9 are provided on both sides of the rubber pulley 6 to fix the rubber pulley 6 and prevent the rubber pulley 6 from shaking, so that the operation of this embodiment is more stable and reliable. The slips 9 are made of aluminum and are in the shape of a disc. The diameter of the slips 9 is greater than or equal to the end face diameter of the rubber pulley 6. In this embodiment, the diameter of the slips 9 is greater than the end face diameter of the rubber pulley 6, and the slips 9 are fixed at both ends of the rubber pulley 6 to form a whole with the rubber pulley 6.
[0023] When using this embodiment, first stir the mud water with your hands or a wooden stick to determine the accurate wellhead position, then place this embodiment and fix it above the wellbore to ensure that the cable 10 is in the slot of the rubber wheel 6 and is perpendicular to the wellhead; then lower the cable 10 into the well by its own gravity, and the rubber wheel 6 rotates as the cable 10 is lowered, which can reduce the labor intensity of the workers and ensure that the cable 10 is smoothly lowered into the well, avoiding the cable 10 swinging back and forth and colliding with the well wall; finally, accurately locate the position of the cable 10 in the well according to the mark on the cable 10, and perform the electric spark excitation micro-well logging construction. After completion, the cable 10 is generally pulled up by manpower.
[0024] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A cable downhole guide frame for electric spark source micro-well logging, characterized in that: It includes a fixed bracket and a rubber pulley rotatably connected to the fixed bracket; the fixed bracket includes a base and a first pillar and a second pillar relatively fixed on the base, wherein the base is provided with a through hole whose size is larger than the wellbore; a cable limiting groove is opened in the middle of the outer peripheral surface of the rubber pulley along the circumferential direction.
2. The cable downhole guide frame for electric spark source micro-logging according to claim 1, characterized in that: Both sides of the first support column and both sides of the second support column are fixedly provided with reinforcing rods connected with the base.
3. The cable downhole guide frame for electric spark source micro-logging according to claim 2 is characterized in that: The base, the first pillar, the second pillar and the reinforcing rod are all made of iron.
4. A cable downhole guide frame for electric spark source micro-logging according to any one of claims 1 to 3, characterized in that: Aluminum slips are arranged on both sides of the rubber pulley, and the diameter of the slips is greater than or equal to the end face diameter of the rubber pulley.
5. The cable downhole guide frame for electric spark source micro-logging according to claim 4 is characterized in that: The rubber wheel and the slips are rotatably connected between the first support column and the second support column through the bearing.