CN-122014226-A - Eight sector cement bond logging instrument

CN122014226ACN 122014226 ACN122014226 ACN 122014226ACN-122014226-A

Abstract

The invention relates to the technical field of logging instruments, in particular to an eight-sector cement bond logging instrument which comprises a centralizer body, wherein connecting caps are fixedly arranged at the upper end and the lower end of the centralizer body, the upper connecting caps are used for detachably and fixedly connecting a magnetic positioning logging device, the lower connecting caps are used for detachably and fixedly connecting the eight-sector cement bond logging device, an assembly sleeve which is vertical up and down is fixedly arranged in the middle of the inside of an assembly cavity, an electric cylinder is arranged in the assembly sleeve, a multifunctional driving plate is fixedly connected to a power output rod of the electric cylinder, racks are symmetrically arranged at the left side and the right side of the multifunctional driving plate, an idle stroke structure is arranged between the racks and the multifunctional driving plate, the racks form meshing transmission with the toothed plate along with linear motion of the multifunctional driving plate, and the linear motion is converted into rotary unfolding motion of driving arms, so that the two driving arms are unfolded and returned simultaneously, and a driving source is driven by the electric cylinder without manual intervention operation in a well.

Inventors

WANG PENG
CHEN CHAO
FU YING
WANG FANG
CHEN YAOHUA
WANG YUNFEI
Nie Yaoyang
WANG YU

Assignees

陕西华晨石油科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (8)

1. The eight-sector cement bond logging instrument comprises a centralizer body (1), wherein connecting caps (2) are fixedly arranged at the upper end and the lower end of the centralizer body (1), the connecting caps (2) are used for being detachably and fixedly connected with a magnetic positioning logging device (3), the connecting caps (2) are used for being detachably and fixedly connected with eight-sector cement bond logging devices (4), the eight-sector cement bond logging instrument is characterized in that an assembling cavity (5) is arranged in the centralizer body (1), an assembling sleeve (6) which is vertical up and down is fixedly arranged in the middle of the inside of the assembling cavity (5), an electric cylinder (7) is arranged in the assembling sleeve (6), a multifunctional driving plate (8) is fixedly connected to a power output rod of the electric cylinder (7), racks (9) are symmetrically arranged on the left side and the right side of the multifunctional driving plate (8), idle stroke structures are used for realizing the fact that the racks (9) are in the detachable and the multifunctional driving plate (8) are fixedly connected with each other, the assembling cavity (12) is correspondingly provided with the corresponding to the assembling cavity (12) of the right side of the centralizer body, the assembling cavity (12) is correspondingly provided with the rotating cavity (11), the multifunctional driving plate (8) is fixedly connected with a driving seat (14), a non-rotating end of the driving arm (12) extends outwards in a straight plate shape, a compensating rod (15) is slidably matched on the driving arm, one end of the compensating rod (15) extends to the outside of the non-rotating end of the driving arm (12), the other end of the compensating rod extends to the vicinity of the toothed plate (13) and is fixedly connected with a trigger seat (16), the trigger seat (16) is located on a movement path of the driving seat (14) and can form extrusion fit with the driving seat (14), and when the multifunctional driving plate (8) drives the toothed plate (13) to be meshed with the toothed plate (9), the driving arm (12) is driven by the toothed plate (13) to rotate to be in a perpendicular state with the centralizer body (1), the driving seat (14) extrudes a left triggering seat (16) and a right triggering seat (16), so that the left compensating rod and the right triggering seat (15) further extend out of one end of a well wall.
2. The eight-sector cement bond logging instrument as recited in claim 1, wherein wire holes (17) are formed between the upper end and the lower end of the assembly cavity (5) and the upper end and the lower end of the connection cap (2) for connecting wires to the electric cylinder (7), the magnetic positioning logging device (3) and the eight-sector cement bond logging device (4).
3. Eight sector cement logging instrument according to claim 2, characterized in that the driving arm (12) extends away from one end of the toothed plate (13) and is fixedly connected with an assembly seat (18) on its extension surface, the compensating rod (15) being elastically sleeved in the assembly seat (18).
4. The eight-sector cement bond logging instrument as claimed in claim 3, wherein a stepped hole is formed in the assembly seat, a stepped hole (19) is formed in the assembly seat (18), the stepped hole (19) is polygonal, the section of the compensation rod (15) is polygonal and is slidably matched with the stepped hole (19), a push plate (20) is fixedly connected to the compensation rod (15), a first spring element (21) is arranged in the stepped hole (19), the first spring element (21) is sleeved on the compensation rod (15), one end of the first spring element is abutted to the push plate (20), and the other end of the first spring element is abutted to a stepped surface of the stepped hole (19).
5. The eight-sector cement bond logging instrument as claimed in claim 4, wherein the idle stroke structure comprises a sliding rail (22), sliding seats (23), second spring elements (24) and limiting pins (25), wherein the sliding rail (22) is symmetrically fixed on the left side and the right side of the multifunctional driving plate (8), the sliding seats (23) are fixedly connected to the inner sides of the two racks (9) respectively, the two sliding seats (23) are in one-to-one sliding fit with the sliding rail (22) on the corresponding side, the second spring elements (24) are arranged in the sliding seats (23), one ends of the second spring elements (24) are fixedly connected with the front ends of the sliding seats (23), the other ends of the second spring elements (24) are fixedly connected with the front ends of the sliding rails (22), so that an idle stroke space is formed between the front ends of the sliding seats (23) and the front ends of the sliding rails (22), the second spring elements (24) are arranged in the idle stroke space, the limiting pins (25) are fixed on the back of the toothed plate (13), and when the toothed plate (13) rotates to drive the driving arm (12) to be in a vertical state with the right body (1), the toothed plate (13) is further engaged with the limiting pins (13) through the limiting pins (5).
6. The eight sector cement bond logging instrument of claim 5, wherein an end of the compensation rod (15) remote from the trigger mount (16) is provided with a roller (26).
7. The eight-sector cement bond logging instrument as recited in claim 6, wherein the slots (11) symmetrically formed on the left and right sides of the centralizer body (1) are rectangular, and the rectangular slots (11) are communicated with the assembly cavity (5) inside the centralizer body (1) for the driving arm (12) to penetrate and rotate.
8. The eight-sector cement bond logging instrument as recited in claim 7, wherein the trigger seats (16) are triangular, the driving seats (14) are circular or arc-shaped, when the two trigger seats (16) rotate along with the two driving arms (12) to be vertical to the centralizer body (1), one inclined surface of the two trigger seats (16) jointly forms a V-shaped compression area, the circular surface or the arc-shaped surface of the driving seats (14) corresponds to the V-shaped compression area, the driving seats (14) are positioned in the middle of the V-shaped compression area to symmetrically extrude the two trigger seats (16), and the two compensating rods (15) are driven to synchronously and reversely move through the two trigger seats (16).

Description

Eight sector cement bond logging instrument Technical Field The invention relates to the technical field of logging instruments, in particular to an eight-sector cement bond logging instrument. Background The eight-sector cement-gel nodule hoop logging instrument is an indispensable core logging device in oilfield drilling and completion operations, and is mainly used for detecting the cementing quality between an oil-water well casing and a cement sheath and between the cement sheath and a stratum, and can be used for assisting in detecting key parameters such as casing integrity, hoop position, borehole diameter change and the like. The method comprises the following working processes that a logging instrument is put into a target well section in a well through a cable or a drill rod, eight-sector cement bond logging devices in the instrument string transmit and receive detection signals (such as sound wave signals) to the well wall through eight circumferentially distributed measurement windows, and finally output cement bond quality evaluation results by combining auxiliary detection data of a magnetic positioning logging device and a gamma logging device, so that reliable field data support is provided for well cementation quality acceptance of oil wells, later well repair operation and oil gas development scheme formulation of the oil wells, and long-term stable production of the oil wells is ensured. In the detection operation, the well-down centering state of the eight-sector cement bond logging device directly determines the accuracy of detection data. In order to ensure that the device is in a stable and centered state after being put into a well, the device is required to be connected with centralizers in a matched mode at the upper end and the lower end, supporting devices are arranged on the centralizers, and after the device is put into a target well section, the device is abutted against a well wall through the supporting devices to realize centralizing and fixing. For example, the Chinese patent application number is CN215256125U, which discloses an eight-sector cement-bonded nodule hoop logging instrument convenient to operate and adjust, wherein the upper end and the lower end of the eight-sector cement-bonded logging instrument are connected with centralizers, and supporting devices are arranged on the centralizers in a matching way. The scheme has the core technical defects that firstly, a single driving source cannot synchronously realize the opening and self-locking actions of the supporting device, the supporting arms are required to be independently controlled to be opened step by step, and then the supporting arms are independently controlled to push the roller to move radially to abut against the well wall, the operation flow is complex, secondly, the supporting structure cannot be automatically unfolded underground, and the supporting structure lacks a reliable self-locking structure after being unfolded, so that the supporting strength is unstable. Disclosure of Invention In order to solve the problems, the invention provides an eight-sector cement bond logging instrument, which comprises a centralizer body, wherein connecting caps are fixedly arranged at the upper end and the lower end of the centralizer body, the connecting caps are used for detachably and fixedly connecting a magnetic positioning logging device, the connecting caps below are used for detachably and fixedly connecting the eight-sector cement bond logging device, an assembling cavity is arranged in the centralizer body, an assembling sleeve which is vertical up and down is fixedly arranged in the middle of the inside of the assembling cavity, an electric cylinder is arranged in the assembling sleeve, a multifunctional driving plate is fixedly connected to a power output rod of the electric cylinder, racks are symmetrically arranged at the left side and the right side of the multifunctional driving plate, a idle stroke structure is arranged between the racks and the multifunctional driving plate, the idle stroke structure is used for realizing the idle stroke relative matching between the racks and the multifunctional driving plate, notches communicated with the assembling cavity are symmetrically arranged at the left side and the right side of the centralizer body, the positions of the assembling cavity corresponding to the two notches are respectively and rotatably connected with the assembling cavity, a toothed plate is arranged at the position corresponding to the assembling cavity, a compensating plate is in the assembling cavity, a rotary plate is arranged at the position corresponding to the assembling cavity, and extends to the compensating plate is in front of the compensating plate, and is in the rotating plate, and extends to the compensating plate is in the rotating position to the position of the compensating plate, and extends to the compensating plate and is in the rotating plate, and extends to th