CN-224228658-U - Near-bit gamma measuring instrument

Abstract

The utility model relates to the technical field of measuring instruments, in particular to a near-bit gamma measuring instrument. The gamma measuring instrument for the near-drill bit comprises a drill rod body, damping mechanisms and fixing mechanisms, wherein drill bits are fixedly arranged at the bottom of the drill rod body, the two damping mechanisms are symmetrically arranged inside the drill rod body along the axial direction of the drill rod body at intervals, the damping mechanisms are used for damping and protecting the measuring instrument, and the fixing mechanisms are arranged on the damping mechanisms and used for fixing the measuring instrument. The utility model provides a near-bit gamma measuring instrument, which solves the technical problem that the measuring instrument is easy to fall off from a rod body in the working process of the existing near-bit gamma measuring instrument.

Inventors

• DU HELI

Assignees

• 天津泛亚科瑞成油田技术有限公司

Dates

Publication Date

20260512

Application Date

20250513

Claims (4)

1. 1. A gamma measuring instrument for near-bit is characterized by comprising a drill rod body (1), a damping mechanism (2) and a fixing mechanism (3), wherein, A drill bit (4) is fixedly arranged at the bottom of the drill rod body (1); the two groups of damping mechanisms (2) are symmetrically arranged inside the drill rod body (1) along the axial direction of the drill rod body (1) at intervals, and the damping mechanisms (2) are used for damping protection of the measuring instrument (5); Each group of damping mechanisms (2) comprises a plurality of damping mechanisms (2) which are arranged at equal intervals along the circumferential direction of the drill rod body (1); The damping mechanism (2) comprises a fixed block (21), a guide rod (22), a sliding block (23), a hydraulic damper (24) and a connecting rod (25), wherein the fixed block is fixed on the guide rod; The two fixing blocks (21) are fixedly arranged on the inner side wall of the drill rod body (1) at intervals along the axial direction of the drill rod body (1); two ends of the guide rod (22) are fixedly connected with two opposite side surfaces of the two fixing blocks (21) respectively; the two sliding blocks (23) are sleeved on the guide rod (22) in a sliding way; The two hydraulic shock absorbers (24) are respectively arranged in parallel with the guide rod (22), and the two hydraulic shock absorbers (24) are respectively arranged between the two sliding blocks (23) and the two fixed blocks (21); One end of the connecting rod (25) is hinged with the sliding block (23), and the other end of the connecting rod (25) is hinged with the fixing mechanism (3); The fixing mechanism (3) is arranged on the damping mechanism (2) and is used for fixing the measuring instrument (5).
2. 2. The near bit gamma gauge of claim 1, wherein the hydraulic shock absorber (24) comprises a top cap (241), a hydraulic rod (242), a bottom cap (243), and a spring (244); one surface of the top cover (241) is fixedly connected with the sliding block (23); One surface of the bottom cover (243) is fixedly connected with the fixed block (21); Two ends of the hydraulic rod (242) are fixedly connected with one surface of the top cover (241) far away from the sliding block (23) and one surface of the bottom cover (243) far away from the fixed block (21) respectively; The spring (244) is sleeved outside the hydraulic rod (242), and two ends of the spring (244) are fixedly connected with the top cover (241) and the bottom cover (243) respectively.
3. 3. The near-bit gamma measuring instrument according to claim 2, wherein the fixing mechanism (3) is in a shape of a circular truncated cone, the outer side wall of the fixing mechanism (3) is hinged to the connecting rod (25), the fixing mechanism (3) is provided with a concave table (31), a plurality of avoidance holes (32) for accommodating bolts (6) are formed in the concave table (31) at equal intervals along the circumferential direction of the concave table, through holes (33) are formed in the middle of the concave table (31), and the concave tables (31) of the two fixing mechanisms (3) are oppositely arranged.
4. 4. A near bit gamma gauge according to claim 3, characterized in that the gauge (5) is arranged between two of the recess tables (31) and is connected to the fixing means (3) by means of bolts (6).

Description

Near-bit gamma measuring instrument Technical Field The utility model relates to the technical field of measuring instruments, in particular to a near-bit gamma measuring instrument. Background The near-bit gamma measuring instrument can be used for judging the richness of organic matters and the clay content of shale reservoirs, identifying the positions of a coal bed methane top plate and a coal bed methane bottom plate, and has extremely high application value in the aspects of positioning and evaluating unconventional oil layers and developing coal bed methane. The existing gamma measuring instrument near the drill bit is directly fixed inside the drill rod, and the drill rod is easy to collide with the outside in the working process, so that the gamma measuring instrument inside the drill rod is easy to loosen and fall off, and the durability of equipment is affected. Disclosure of utility model The utility model provides a near-bit gamma measuring instrument, which solves the technical problem that the measuring instrument is easy to fall off from a rod body in the working process of the existing near-bit gamma measuring instrument. In order to achieve the technical aim, the utility model adopts the following scheme that the near-bit gamma measuring instrument comprises a drill rod body, a damping mechanism and a fixing mechanism, wherein, The bottom of the drill rod body is fixedly provided with a drill bit; The two groups of damping mechanisms are symmetrically arranged inside the drill rod body along the axial interval of the drill rod body, and the damping mechanisms are used for damping and protecting the measuring instrument; the fixing mechanism is arranged on the damping mechanism and used for fixing the measuring instrument. Further, each group of damping mechanisms comprises a plurality of damping mechanisms which are arranged at equal intervals along the circumferential direction of the drill rod body; The damping mechanism comprises a fixed block, a guide rod, a sliding block, a hydraulic damper and a connecting rod, wherein the fixed block is arranged on the guide rod; the two fixing blocks are fixedly arranged on the inner side wall of the drill rod body along the axial direction of the drill rod body at intervals; Two ends of the guide rod are fixedly connected with two side surfaces opposite to the two fixed blocks respectively; the two sliding blocks are sleeved on the guide rod in a sliding way; the two hydraulic shock absorbers are respectively arranged in parallel with the guide rod and are respectively arranged between the two sliding blocks and the two fixed blocks; one end of the connecting rod is hinged with the sliding block, the other end of the connecting rod is hinged with the fixing mechanism. Further, the hydraulic shock absorber comprises a top cover, a hydraulic rod, a bottom cover and a spring; one surface of the top cover is fixedly connected with the sliding block; One surface of the bottom cover is fixedly connected with the fixed block; both ends of the hydraulic rod are respectively far away from the sliding block with the top cover one side and the bottom cover are far away from the fixing part one surface of the block is fixedly connected; the spring is sleeved outside the hydraulic rod, and two ends of the spring are fixedly connected with the top cover and the bottom cover respectively. Further, fixed establishment is round platform form, and fixed establishment's lateral wall is articulated with the connecting rod, and fixed establishment is equipped with the concave station, and a plurality of holes of dodging that are used for holding the bolt have been seted up along its circumferencial direction equidistant in the concave station, and the concave station middle part is equipped with the through-hole, and the concave station of two fixed establishment sets up relatively. Further, the measuring instrument is arranged between the two concave tables and is connected with the fixing mechanism through bolts. Compared with the prior art, the utility model has the beneficial effects that: 1. The utility model is provided with the damping mechanism, and the damping mechanism can effectively relieve vibration in the working process of the drill rod body, so that the measuring instrument is prevented from falling off from the drill rod body, and the durability of the equipment is improved. 2. When the drill bit works, the sliding block can slide up and down along the guide rod under the action of vibration force, at the moment, the hydraulic shock absorber can buffer the sliding block to a certain extent, vibration is prevented from directly acting on the measuring instrument, and the anti-vibration effect of the equipment is improved. Drawings FIG. 1 is a schematic diagram of a near-bit gamma measurement instrument according to an embodiment of the present utility model; Fig. 2 is a schematic diagram of the inside of a drill rod body of a near-bit gamma measurement