CN-117073831-B - Mechanical drill string vibration measuring tool

CN117073831BCN 117073831 BCN117073831 BCN 117073831BCN-117073831-B

Abstract

The invention discloses a mechanical drill string vibration measuring tool, which relates to the technical field of petroleum and natural gas drilling and comprises an upper barrel, a lower barrel and a hollow shaft which are coaxially arranged, wherein the upper barrel is connected with the lower barrel, a cavity is formed between the upper barrel and the lower barrel, an upper outer hole and a lower outer hole are formed in the side wall of the upper barrel, the upper outer hole and the lower outer hole are both communicated with the cavity, the hollow shaft is positioned at the inner sides of the upper barrel and the lower barrel, the hollow shaft is respectively connected with the upper barrel and the lower barrel in a sliding manner, the lower end of the hollow shaft is used for being connected with a drill string, an inner flow channel is formed by the inner cavity of the hollow shaft and the inner cavity of the upper barrel, an upper inner hole and a lower inner hole are formed in the side wall of the hollow shaft, the upper inner hole and the lower inner hole are both communicated with the inner flow channel, and the upper inner hole can be communicated with the upper outer hole and the lower outer hole. The invention is applied to a drill string vibration measurement and control system, and can improve the reliability of receiving, forming and transmitting the vibration signals of the drilling tool.

Inventors

XUE QILONG
TAN XINGYU
WANG JIN
QU JUN

Assignees

中国地质大学（北京）

Dates

Publication Date: 20260512
Application Date: 20230824

Claims (7)

1. The mechanical drill string vibration measuring tool is characterized by comprising an upper barrel, a lower barrel and a hollow shaft which are coaxially arranged, wherein the upper barrel is connected with the lower barrel, a cavity is formed between the upper barrel and the lower barrel, an upper outer hole and a lower outer hole are formed in the side wall of the upper barrel, the upper outer hole and the lower outer hole are both communicated with the cavity, the hollow shaft is positioned on the inner sides of the upper barrel and the lower barrel, the hollow shaft is respectively connected with the upper barrel and the lower barrel in a sliding manner, the lower end of the hollow shaft is used for being connected with a drill string, an inner cavity of the hollow shaft and the inner cavity of the upper barrel form an inner runner, an upper inner hole and a lower inner hole are formed in the side wall of the hollow shaft, the upper inner hole and the lower inner hole are both communicated with the inner runner, the upper inner hole can be communicated with the upper outer hole, and the lower inner hole can be communicated with the lower outer hole; in the initial position, the axis of the upper inner hole is parallel to the axis of the upper outer hole, and the axis of the lower inner hole is parallel to the axis of the lower outer hole; the direction of the axis of the upper inner hole is inclined downwards from the inner wall of the hollow shaft to the outer wall of the hollow shaft, and the direction of the axis of the lower inner hole is inclined upwards from the inner wall of the hollow shaft to the outer wall of the hollow shaft; a drainage gap is arranged between the lower end of the upper cylinder body and the lower cylinder body, and in an initial position, the drainage gap is communicated with the lower inner hole.
2. The mechanical drill string vibration measuring tool according to claim 1, wherein the outer wall of the hollow shaft is provided with an external spline, the external spline is parallel to the axial direction of the hollow shaft, the inner wall of the upper cylinder is provided with an internal spline, the internal spline is parallel to the axial direction of the upper cylinder, the length of the external spline is larger than that of the internal spline, and the internal spline is in sliding connection with the external spline.
3. The mechanical drill string vibration measuring tool according to claim 2, wherein an adjusting bushing is provided at an upper end of the hollow shaft, the adjusting bushing being threadedly connected to the hollow shaft, the adjusting bushing being contactable with an upper end of the internal spline.
4. The mechanical drill string vibration measuring tool according to claim 3, wherein the adjusting bush is provided with a plurality of rectangular grooves along the circumferential direction of the adjusting bush.
5. The mechanical drill string vibration measuring tool according to claim 1, wherein the inner wall of the upper cylinder is provided with a step, the outer wall of the hollow shaft is provided with a protrusion, and in the extreme working position the step is in contact with the protrusion.
6. The mechanical drill string vibration measuring tool according to claim 1, wherein the upper cylinder is threadedly connected to the lower cylinder.
7. The mechanical drill string vibration measuring tool according to claim 1, wherein an upper sealing ring is arranged between the upper cylinder and the hollow shaft, and a lower sealing ring is arranged between the lower cylinder and the hollow shaft.

Description

Mechanical drill string vibration measuring tool Technical Field The invention relates to the technical field of petroleum and natural gas drilling, in particular to a purely mechanical underground drill stem vibration measuring tool. Background Drill string vibration refers to the interaction between the drill bit and the formation during drilling that imparts axial, lateral, and torsional vibration to the drill string. Drill string vibration is a common problem in the current drilling engineering, and severe drill string vibration can accelerate the damage of a drilling tool, so that the service life of the drilling tool is greatly shortened, and the drilling tool is a main cause of fatigue failure of the drilling tool. As well depths increase, the hardness and plasticity of the rock in deep formations increases, and drill failure due to drill vibration is more pronounced. Drilling and logging personnel need to monitor the vibration signal downhole continuously in order to adjust the drilling process in time, and the measurement accuracy and reliability of the vibration signal will significantly affect the judgment of the operator or control system. At present, most of existing drill string vibration measuring tools are developed based on various electronic components, but under the severe working condition of the bottom of a well, the measuring precision of the electronic components is affected, and under extreme conditions such as high temperature, high pressure and the like, the measuring cannot be effectively performed, so that the reliability of a measuring system is greatly reduced. Thus, there is a need for a downhole vibration measurement tool that does not rely on electronics to provide reliable data in real time to surface personnel. Disclosure of Invention The invention aims to provide a mechanical drill string vibration measuring tool which is applied to a drill string vibration measuring and controlling system and can improve the reliability of receiving, forming and transmitting a drilling tool vibration signal. In order to achieve the above object, the present invention provides the following solutions: The invention provides a mechanical drill string vibration measuring tool which comprises an upper cylinder body, a lower cylinder body and a hollow shaft which are coaxially arranged, wherein the upper cylinder body is connected with the lower cylinder body, a cavity is formed between the upper cylinder body and the lower cylinder body, an upper outer hole and a lower outer hole are formed in the side wall of the upper cylinder body, the upper outer hole and the lower outer hole are both communicated with the cavity, the hollow shaft is positioned on the inner sides of the upper cylinder body and the lower cylinder body, the hollow shaft is respectively connected with the upper cylinder body and the lower cylinder body in a sliding manner, the lower end of the hollow shaft is used for being connected with a drill string, an inner flow channel is formed by the inner cavity of the hollow shaft and the inner cavity of the upper cylinder body, an upper inner hole and a lower inner hole are formed in the side wall of the hollow shaft, the upper inner hole and the lower inner hole are both communicated with the inner flow channel, and the upper inner hole can be communicated with the upper outer hole and the lower inner hole can be communicated with the lower outer hole. Preferably, the outer wall of the hollow shaft is provided with an external spline, the external spline is parallel to the axial direction of the hollow shaft, the inner wall of the upper cylinder body is provided with an internal spline, the internal spline is parallel to the axial direction of the upper cylinder body, the length of the external spline is larger than that of the internal spline, and the internal spline is in sliding connection with the external spline. Preferably, an adjusting bush is arranged at the upper end of the hollow shaft, the adjusting bush is in threaded connection with the hollow shaft, and the adjusting bush can be in contact with the upper end of the internal spline. Preferably, a plurality of rectangular grooves are formed in the adjusting bush along the circumferential direction of the adjusting bush. Preferably, the inner wall of the upper cylinder is provided with a step, the outer wall of the hollow shaft is provided with a protrusion, and in the limit working position, the step is in contact with the protrusion. Preferably, in the initial position, the axis of the upper inner hole is parallel to the axis of the upper outer hole, the axis of the lower inner hole is parallel to the axis of the lower outer hole, and in the limit working position, the axis of the upper inner hole is coincident with the axis of the upper outer hole, and the axis of the lower inner hole is coincident with the axis of the lower outer hole. Preferably, the direction of the axis of the upper inner hole is inclined down