Quantitative analysis and controlling method for pipe string erosion in gas drilling;

Development and application of drill pipe valve used in gas drilling;

Causes of and solutions to easy deviation of gas drilling track;

Analysis of the sustainable competence of Chinese textile industrial based on diamond system;

Look at the Japanese Industrial Competitiveness from "Diamond System;

The activity and development moulds in Nantong home textiles manufaturing cluster are analyzed with the developing factors,demands,related and supporting industries and the competitors′ strategy,structure and features also discussed by using Poter diamond system.

A debris-gas sample collecting device for air drilling;

But on the other hand, air drilling adopted air as the circular medium and so hydrocarbons like natural gas and oil mixed with air will cause downhole explosion if only the mixture reaches the explosion limit under any possible explosive condition, which will certainly threaten the safety during operations of air drilling.

The advantages of air drilling,such as much faster in footage,protect the reservoir from contamination and less cost, make its widely application in oil fields, whereas the pressure distribution in circulation,the drilling machinery choice and the configuration of drilling parameters is distingu.

The industry clusters become a kind of gradually the lately analytical industry growth and districts develop the theories, because of it to the great significance of the economic development,it usually make use of the global value chain model, diamond model, agility profession to turn for the study of the research and the growth mode that the industry cluster and collective efficiency model etc.