scholarly journals Study on a New Steering Mechanism for Point-the-Bit Rotary Steerable System

2014 ◽  
Vol 6 ◽  
pp. 923178 ◽  
Author(s):  
Yuanzhi Li ◽  
Wentie Niu ◽  
Hongtao Li ◽  
Zhenjun Luo ◽  
Lina Wang
Keyword(s):  
Motion Control ◽  
Structural Design ◽  
Displacement Vector ◽  
Engineering Application ◽  
Planetary Gear ◽  
Motion Trajectory ◽  
Small Tooth ◽  
Steering Mechanism ◽  
Tooth Number ◽  
2D And 3D

This paper presents a novel steering mechanism embedded in a point-the-bit rotary steerable system (RSS) for oilfield exploitation. The new steering mechanism adopts a set of universal joints to alleviate the high alternative strain on drilling mandrel and employs a specially designed planetary gear small tooth number difference (PGSTD) to achieve directional steering. Its principle and characteristics are explained and examined through a series of analyses. First, the eccentric displacement vector of the offset point on the drilling mandrel is formulated and kinematic solutions are established. Next, structural design for the new steering mechanism is addressed. Then, procedures and program architectures for simulating offset state of the drilling mandrel and motion trajectory of the whole steering mechanism are presented. After that, steering motion simulations of the new steering mechanism for both 2D and 3D well trajectories are then performed by combining LabVIEW and SolidWorks. Finally, experiments on the steering motion control of the new steering mechanism prototype are carried out. The simulations and experiments reveal that the steering performance of the new steering mechanism is satisfied. The research can provide good guidance for further research and engineering application of the point-the-bit RSS.

Small Tooth Number Difference Planetary Gear Drive with a Crank and Oscillating Block Inputting Mechanism

2011 ◽  
Vol 52-54 ◽  
pp. 1268-1273 ◽  
Author(s):  
Jian Kun Cui
Keyword(s):  
Potential Application ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Gear Pair ◽  
Gear Drive ◽  
Small Tooth ◽  
Tooth Number ◽  
New Type ◽  
Internal Gear ◽  
Block Mechanism

A new mechanism construction for small tooth number difference planetary gear drive is developed in which the planet wheel is guided by a planar crank and oscillating block mechanism. The sizes of linkage are design dexterously to get an approximate circumference linkage curve so that the engaging condition of internal gear pair can be satisfied. The trajectory of the inner gear center motion is analyzed and its error comparing with a standard circle is calculated to avoid movement interference. The movement of inner gear is study particularly to deduced formula of instantaneous transmission ratio. Despite observable fluctuation of output speed, this new type of gear transmission mechanism still has potential application value in situation with large ratio and low input speed. A hand drive winch prototype using the mechanism is also illustrated in this paper.

Design of New Type Involute Planetary Gear Reducer of Small Tooth Number Difference

2012 ◽  
Vol 490-495 ◽  
pp. 2076-2080
Author(s):  
Hui Zhang
Keyword(s):  
Planetary Gear ◽  
Input Frequency ◽  
Closed Graph ◽  
Small Tooth ◽  
Inherent Frequency ◽  
Tooth Number ◽  
New Type ◽  
The Common ◽  
Internal Gear ◽  
Ansys Workbench

Based on the analysis of the common NN-type involute planetary gear reducer with small tooth number difference, this paper replaced the traditional eccentric axle sleeve with double eccentric crankshaft, so as to simplify the structure of involute planetary gear reducer with small tooth number difference; and then used closed graph to select the modification coefficients of the internal gear pairs thereby accomplishing the design of the new type reducer; Finally, used ANSYS Workbench software to analyze the modal of 3D virtual prototype, and arrived at a realized conclusion :the inherent frequency of the system is much higher than the input frequency, so resonance will not occur.

Innovation design and experiment research on the N–N type planetary gear apparatus with small tooth number difference

2016 ◽  
Vol 230 (15) ◽  
pp. 2699-2708 ◽  
Author(s):  
Wei Pu ◽  
Jiaxu Wang ◽  
Yuefeng Xin ◽  
Junyang Li ◽  
Guangwu Zhou ◽  
...  
Keyword(s):  
Side Effect ◽  
High Performance ◽  
Experimental Testing ◽  
Planetary Gear ◽  
Root Cause ◽  
Small Tooth ◽  
Tooth Number ◽  
New Type ◽  
Long Life ◽  
Harmful Side Effect

The three high-performance indicators (low retrace tolerance, long life and low vibration) of N–N type planetary gear apparatus with small tooth number difference (abbrev “N–N–PGA”) are hardly achieved simultaneously until recently. At present, the root cause analysis (RCA) and TRIZ are considered to be comprehensive and systematic new theories for technological innovation, which provides a new way to figure out the conundrum existed in the N–N–PGA. In the present study, the “root cause” of the problem is proposed with the RCA approach and two contradictions existed in the N–N–PGA have been revealed: Harmful side effect and stability of composition; harmful side effect and durability of a moving object. Besides, two reasonable principles (“Dynamicity” and “Composite materials”) for the N–N–PGA design recommended by the TRIZ method are used to eliminate these contradictions. In addition, a prototype of the obtained new type N–N–PGA design is developed for experimental testing. The obtained result demonstrates the capability of the above method for obtaining low retrace tolerance, long life, and low vibration.

Chilean Structural Design Guide for Low-Volume Roads

2003 ◽  
Vol 1819 (1) ◽  
pp. 306-313 ◽  
Author(s):  
Guillermo Thenoux ◽  
Alvaro González ◽  
Felipe Halles
Keyword(s):  
South Africa ◽  
Structural Design ◽  
Engineering Application ◽  
Climate Conditions ◽  
Design Charts ◽  
Low Volume Roads ◽  
Mechanistic Analysis ◽  
Design Guide ◽  
Low Volume ◽  
Selection Of

The practical and theoretical principles used for development of the Chilean Structural Design Guide for Low-Volume Roads 2002 and the guide’s conceptual model and hypotheses are presented. The design guide is a simplified methodology for selection of different pavement structure alternatives for a variety of conditions (traffic, soil support capacity, and climate). The design guide provides solutions for four traffic ranges, six ranges of soil support capacity, and three climate conditions (dry, normal, and saturated). The design charts contain more than 150 solutions. Pavement structural design was solved by mechanistic analysis with the BISAR computer program and fatigue models developed in South Africa. The design guide may be considered an engineering application with upto- date research tools and results.

Sign in / Sign up

Export Citation Format

Share Document