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Experimental device for researching drill column dynamic characteristic

A technology of dynamic characteristics and experimental equipment, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as difficult to truly reflect the vibration of the bottom hole drilling tool and the attenuation of lateral vibration of the drill string. To achieve the effect of accurate and feasible research experiment data

Inactive Publication Date: 2014-04-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to truly reflect the vibration of the bottom hole drilling tool by monitoring on the land surface or by the bottom hole measurement system. For example, the lateral vibration of the drill string attenuates sharply in the process of propagating from the bottom to the wellhead

Method used

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  • Experimental device for researching drill column dynamic characteristic
  • Experimental device for researching drill column dynamic characteristic
  • Experimental device for researching drill column dynamic characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: The present invention provides an experimental device for studying the dynamic characteristics of a drill string, including a main frame, a simulated borehole wall assembly, a rotary assembly, a disk assembly, an excitation assembly, a weighing assembly and a detection device ;

[0036] The main frame is composed of a main frame 3, angle links and connecting bolts and nuts 15;

[0037] The simulated well wall assembly includes a plexiglass tube 4, a fixing fixture 5, and a fixture mounting plate 6. The plexiglass tube 4 passes through the fixing fixture 5 and is fixed in the fixing fixture 5, and the fixing fixture 5 is fixed on the fixture mounting plate 6 Above, the fixture mounting plate 6 is installed on the main frame 3 through bolts and nuts, and the thin steel column 7 passes through the plexiglass tube 4. During the experiment, the thin steel column 7 is in contact with the plexiglass tube 4 to simulate the relationship between the drill string and...

Embodiment 2

[0046] Embodiment 2: the present invention provides a kind of experimental equipment of research drill string dynamic characteristic, and the structure of experimental equipment is as figure 1 , used to study the drill string used in a certain drilling section, the type is: the outer diameter is 89mm, the inner diameter is 78mm; the outer diameter of the core bit is 95mm, the inner diameter is 63mm. Now it is necessary to conduct dynamic research on this type of drill string with a length of 20m, a weight on bit of 15kN, and a rotational speed of 450-600rpm. The method of simulation experiment is:

[0047] Step 1: Using the finite element method, the continuous drill string is discretized into a finite number of lumped masses in the borehole, and three adjacent lumped masses are taken: m k-1 ,m k ,m k+1 to analyze, such as Figure 4 shown.

[0048] Figure 4 middle: m k-1 ,m k ,m k+1 - Three consecutive lumped masses k-1, k, k+1 in the drill string discrete unit;

[...

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Abstract

The invention relates to an experimental device for researching a drill column dynamic characteristic. The experimental device comprises a main machine frame, a well-wall-simulating assembly, a rotary assembly, a disc assembly, an excitation assembly, a weighing assembly and a detecting device. The well-wall-simulating assembly comprises an organic glass tube, a fixing clamping and a clamp mounting plate. The rotary assembly is provided with a motor, a driver, a coupler, a thin steel column and a top mounting plate, the rotary assembly penetrates through the whole main machine frame, the disc assembly comprises a disc and a cylinder, the disc is arranged on a floating platform, and the disc conducts rotary movement in the cylinder. An exciter in the excitation assembly excites the bottom of the disc according to the input signal type to simulate interaction of a drill head and rocks at the bottom of a borehole. The detecting device comprises a whirling motion track and a transverse vibration and longitudinal vibration detecting device. The experimental device for researching the drill column dynamic characteristic can simulate the vibration and deformation situations of a drill column and determine the parameters of the rotating speed, the bit pressure similarity ratio and the like according to the dynamic similarity ratio and the geometric similarity ratio.

Description

technical field [0001] The invention relates to an experimental device for studying the dynamic characteristics of a drill string. Background technique [0002] Drilling dynamics is the basis for research on issues such as optimal drilling parameter settings, drill string fatigue, wear, vibration, buckling behavior, whirl, wellbore trajectory prediction and control, and drilling risk assessment. The mechanical behavior of the drill string in the wellbore is a double nonlinear problem including geometric nonlinearity and contact nonlinearity. [0003] The vibration of the drill string can be decomposed into three types: longitudinal, lateral, and torsional. In addition, the vibration of the drill string is also affected by factors such as drilling fluid, hole wall, and drilling tool weight. It is difficult to truly reflect the vibration of the bottom hole drilling tool when it is monitored on the land surface or detected by the bottom hole measurement system. For example, t...

Claims

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Application Information

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IPC IPC(8): G01M13/00
Inventor 李波王锡霖张东宵王龙左国勇赵海侗尹邵君
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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