Centralizing device for geophysical logging

Abstract

The utility model relates to the technical field of geophysical logging, in particular to a centralizing device for geophysical logging, which is characterized in that a logging instrument body is provided with a connecting sleeve group, four groups of guide cylinder groups are uniformly arranged on the circumferential outer wall of the connecting sleeve group at intervals, each guide cylinder group consists of two parallel guide cylinders, and the guide cylinders are arranged on the connecting sleeve group. A sliding groove is formed in each guide cylinder, a sliding frame is slidably connected into each sliding groove, one end of each sliding frame slides along the corresponding sliding groove in the corresponding guide cylinder, the other end of each sliding frame slidably penetrates through the corresponding guide cylinder, and a roller is rotatably mounted between the two parallel sliding frames. The sliding frame is driven by the spring to move outwards, so that the rolling wheel is tightly attached to the well wall, the position of the rolling wheel can be automatically adjusted according to the actual diameter of a shaft, and the logging instrument can be kept in the center of the shaft all the time.

Description

TECHNICAL FIELD

[0001] The utility model relates to geophysical logging technical field, concretely relates to a geophysical logging righting device. BACKGROUND

[0002] Geophysical logging is one of the key technologies in the exploration and development of oil, gas and geothermal resources. By lowering various sensors or instruments into the well, the physical properties of the rock and fluid around the well wall are measured. In order to obtain accurate and reliable logging data, the logging instrument must be able to operate stably in the wellbore and maintain an appropriate distance from the well wall to avoid data distortion or equipment damage caused by instrument tilt or contact with the well wall.

[0003] However, the traditional spring leaf type centralizer has several significant problems in geophysical logging: first, due to its poor adaptability, it is difficult to automatically adjust when the wellbore diameter changes greatly, which easily leads to the logging instrument deviating from the center position; in addition, the spring leaf of the centralizing wing closely contacts the well wall, resulting in a large friction force between them, which increases the running resistance, making it difficult for the logging instrument to move, and even get stuck; especially in the case of rough well wall or obstacles, the spring leaf of the centralizing wing is also prone to damage, thereby shortening its service life.

[0004] Therefore, it is necessary to design a geophysical logging righting device that can adapt to different wellbore diameters and has small running resistance. SUMMARY

[0005] The technical solution of the utility model is: a geophysical logging righting device, comprising a logging instrument body, a connecting sleeve group is installed on the logging instrument body, four groups of guide cylinder groups are uniformly arranged on the circumferential outer wall of the connecting sleeve group, each guide cylinder group is composed of two parallel guide cylinders, a sliding slot is formed in each guide cylinder, and a sliding frame is slidably connected in the sliding slot, one end of the sliding frame slides along the sliding slot in the guide cylinder, the other end slides through the guide cylinder, a roller is rotatably installed between the two parallel sliding frames, the roller is used for rolling cooperation with the well wall, a spring is arranged between the end of the sliding frame in the guide cylinder and the end of the guide cylinder sliding slot, and the spring is used for driving the sliding frame to move away from the connecting sleeve group.

[0006] In one of the embodiments, the logging instrument body is slidably connected with a sliding sleeve, the sliding sleeve is rotatably connected with a connecting rod, the connecting rod is rotatably connected with a fixed shaft installed on the sliding frame; when the roller on one side encounters resistance from the protrusion while rolling along the well wall, the roller compresses the spring through the sliding frame and slides along the guide cylinder, at the same time, the sliding sleeve is driven to slide horizontally along the logging instrument body through the connecting rod, so as to ensure that the logging instrument body is in the center of the well, and the centralizing function of the logging instrument body is realized, thereby avoiding the inclination of the logging instrument body and the resulting data distortion.

[0007] In one of the embodiments, the fixed shaft is in the same straight line with the shaft for installing the roller.

[0008] In one of the embodiments, the arc-shaped vulnerable part is sleeved on the outer wall of the roller, the inner side of the arc-shaped vulnerable part is provided with a mounting block, the mounting block is provided with a fixing hole, and a fixing screw is passed through the fixing hole and fixedly connected with the roller, so as to fix the arc-shaped vulnerable part on the roller, thereby achieving the effect of conveniently replacing the arc-shaped vulnerable part.

[0009] In one of the embodiments, the position of the connecting sleeve group on the logging instrument body is adjustably arranged; the connecting sleeve group can be adjusted in position on the logging instrument body, which means that the user can optimize the position of the centralizing device according to different well diameters or specific measurement requirements. In addition, the connecting sleeve group is effectively fixed on the logging instrument body through the threaded connection between the two sleeves with different diameters, thereby achieving convenient fixing after adjusting the position of the connecting sleeve group.

[0010] In one of the embodiments, the connecting sleeve group includes two sleeves with different diameters, and the two sleeves are threadedly connected.

[0011] Beneficial effects: 1. The sliding frame is driven by the spring to move outward, so that the roller closely contacts the well wall and can automatically adjust the position of the roller according to the actual diameter of the well, which enables the logging instrument to always remain in the center of the well, and even in the well with large diameter variation, the instrument can also run stably, avoiding the problem of deviation from the center.

[0012] 2. The roller replaces the traditional spring sheet closely contacting the well wall, and adopts rolling contact instead of sliding friction, which greatly reduces the friction between the instrument and the well wall during logging; this not only makes the logging instrument more easily move and reduces the risk of jamming, but also protects the well wall from unnecessary damage.

[0013] 3. The arc-shaped vulnerable part wrapped outside the roller can be quickly replaced after wear without disassembling the entire roller assembly, which not only saves maintenance time and cost, but also ensures the long-term effective performance of the centralizing device.

[0014] 4、When encountering the protrusions on the well wall or other obstacles, the posture of the sliding frame and the roller is adjusted in time through the cooperation of the connecting rod and the sliding sleeve, so that the well logging instrument body is always located at the center position of the well, and data distortion caused by inclination or deviation is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0016] Figure 2 It is a three-dimensional structure schematic view of the utility model guiding cylinder, sliding frame, roller and spring.

[0017] Figure 3 It is a part of three-dimensional structure schematic view of the utility model.

[0018] Figure 4 It is a three-dimensional structure schematic view of the utility model arc-shaped wearing part, mounting block and fixing hole.

[0019] In the figure, marked as: 1-well logging instrument body, 2-connection sleeve group, 3-guiding cylinder, 4-sliding frame, 5-roller, 6-spring, 7-fixing shaft, 8-connecting rod, 9-sliding sleeve, 10-arc-shaped wearing part, 1001-mounting block, 11-fixing hole. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in combination with the drawings and specific embodiments, but does not limit the protection scope and application scope of the utility model.

[0021] Embodiment: a righting device for geophysical well logging, such as Figures 1-2As shown, it comprises a logging instrument body 1, a connecting sleeve group 2, guide tubes 3, sliding frames 4, rollers 5 and springs 6. The connecting sleeve group 2 is mounted on the logging instrument body 1, and its position on the logging instrument body 1 is adjustable. The connecting sleeve group 2 comprises two sleeves with different diameters, and the two sleeves are connected by threads. The connecting sleeve group 2 can be adjusted in position on the logging instrument body 1, which means that the user can optimize the position of the centralizer according to different hole diameters or specific measurement requirements. In addition, the connecting sleeve group 2 is effectively fixed on the logging instrument body 1 through the threaded connection between the two sleeves with different diameters, thereby achieving convenient fixing after adjusting the position of the connecting sleeve group 2. Four groups of guide tube groups are evenly arranged on the circumferential outer wall of the connecting sleeve group 2, each group of guide tube groups consists of two parallel guide tubes 3, each guide tube 3 is provided with a sliding groove, and a sliding frame 4 is slidably connected in the sliding groove. One end of the sliding frame 4 slides along the sliding groove in the guide tube 3, and the other end slides through the guide tube 3 and extends outside the guide tube 3. A roller 5 is rotatably mounted between the two parallel sliding frames 4, and the roller 5 is used to roll with the well wall. A spring 6 is arranged between the end of the sliding frame 4 in the guide tube 3 and the end of the guide tube 3 sliding groove, and the spring 6 is used to drive the sliding frame 4 to move away from the connecting sleeve group 2. The sliding frame 4 is driven to move by the spring 6, so that the roller 5 tightly adheres to the well wall, thereby adapting to different diameter wellbores.

[0022] When the logging instrument body 1 is put into the well for measurement, the rollers 5 of the centralizer come into contact with the well wall. Due to the action of the spring 6, the sliding frame 4 is always subjected to an outward pushing force, so that the roller 5 tightly adheres to the well wall. Therefore, even if the well wall is irregular or inclined, the roller 5 can ensure that the logging instrument body 1 maintains the central position of the well through its rolling cooperation with the well wall.

[0023] As shown in Figure 1 and Figure 3 , a sliding sleeve 9 is slidably connected to the logging instrument body 1, and a connecting rod 8 is rotatably connected to the sliding sleeve 9. One end of the connecting rod 8 away from the sliding sleeve 9 is rotatably connected to a fixed shaft 7 mounted on the sliding frame 4, and the fixed shaft 7 is on the same straight line as the shaft for mounting the roller 5. When the roller 5 on one side encounters resistance from a protrusion during rolling along the well wall, the roller 5 compresses the spring 6 through the sliding frame 4 and slides along the guide tube 3, and at the same time, the sliding sleeve 9 is driven to slide horizontally along the logging instrument body 1 through the connecting rod 8, thereby ensuring that the logging instrument body 1 is in the central position of the well, realizing the centralizing function of the logging instrument body 1, and avoiding the inclination of the logging instrument body 1 to cause data distortion.

[0024] When one side of the roller 5 encounters a protrusion on the well wall or other obstacles during travel, the sliding frame 4 connected with the roller 5 slides inwards along the sliding groove in the guide cylinder 3 and compresses the spring 6; meanwhile, the sliding frame 4 transmits the movement to the sliding sleeve 9 through the cooperation of the fixed shaft 7 and the connecting rod 8, so that the sliding sleeve 9 slides horizontally along the logging instrument body 1, thereby adjusting the position of the roller 5 and the sliding frame 4 on the other side, so as to ensure that the logging instrument body 1 is located at the center of the well, so as to achieve the effect that the roller 5 passes over the obstacles without causing the position of the logging instrument body 1 to deviate or tilt; when the roller 5 passes over the obstacles, the spring 6 releases the stored energy and pushes the sliding frame 4 and the roller 5 to move outwards again, so as to restore to the original state of being close to the well wall; in this way, the logging instrument body 1 can be stably maintained at the center of the well during the entire measurement process.

[0025] As shown in Figure 1 and Figure 4 The roller 5 is sleeved with an arc-shaped wear part 10 on the outer circumferential wall, the inner side of the arc-shaped wear part 10 is provided with a mounting block 1001, the mounting block 1001 is provided with a fixing hole 11, and a fixing screw is inserted through the fixing hole 11 and fixed to the roller 5, so as to fix the arc-shaped wear part 10 on the roller 5, thereby achieving the effect of conveniently replacing the arc-shaped wear part 10.

[0026] The arc-shaped wear part 10 wrapped outside the roller 5 can protect the roller 5 from being worn, and when the arc-shaped wear part 10 is damaged due to friction, a new wear part can be quickly disassembled and installed through the fixing screw, so as to ensure long-term effective work of the centralizing device.

[0027] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A centralizer device for geophysical well logging, comprising a logging instrument body (1), characterized in that: The logging instrument body (1) is provided with a connecting sleeve group (2), four groups of guide cylinder groups are uniformly arranged on the circumferential outer wall of the connecting sleeve group (2), each group of the guide cylinder groups is composed of two parallel guide cylinders (3), a sliding groove is formed in each guide cylinder (3), and a sliding frame (4) is slidably connected in the sliding groove, one end of the sliding frame (4) slides along the sliding groove in the guide cylinder (3), the other end of the sliding frame (4) slides through the guide cylinder (3), a roller (5) is rotatably arranged between the two parallel sliding frames (4), the roller (5) is used for rolling cooperation with the well wall, a spring (6) is arranged between the end of the sliding frame (4) in the guide cylinder (3) and the end of the sliding groove of the guide cylinder (3), and the spring (6) is used for driving the sliding frame (4) to move away from the connecting sleeve group (2).

2. A centralizer for use in geophysical well logging as defined in claim 1, characterized in that: The logging instrument body (1) is provided with a connecting sleeve group (2), four groups of guide cylinder groups are uniformly arranged on the circumferential outer wall of the connecting sleeve group (2), each group of the guide cylinder groups is composed of two parallel guide cylinders (3), a sliding groove is formed in each guide cylinder (3), and a sliding frame (4) is slidably connected in the sliding groove, one end of the sliding frame (4) slides along the sliding groove in the guide cylinder (3), the other end of the sliding frame (4) slides through the guide cylinder (3), a roller (5) is rotatably arranged between the two parallel sliding frames (4), the roller (5) is used for rolling cooperation with the well wall, a spring (6) is arranged between the end of the sliding frame (4) in the guide cylinder (3) and the end of the sliding groove of the guide cylinder (3), and the spring (6) is used for driving the sliding frame (4) to move away from the connecting sleeve group (2).

3. A centralizer for use in geophysical well logging as defined in claim 2, wherein: The fixed shaft (7) is arranged on the same line with the shaft for mounting the roller (5).

4. A centralizer for use in geophysical well logging as defined in claim 3, wherein: An arc-shaped vulnerable part (10) is sleeved on the circumferential outer wall of the roller (5).

5. A centralizer for use in geophysical well logging as defined in claim 4, wherein: The position of the connecting sleeve group (2) on the logging instrument body (1) is adjustably arranged.

6. A centralizer for use in geophysical well logging as defined in claim 5, wherein: The connecting sleeve group (2) includes two sleeves with different diameters, and the two sleeves are threadedly connected.

Images