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Huang Hongchun(Langfang Branch, RIPED,CNPC).NATUR.GAS IND.v.20,no.2,pp.54~56,3/25/2000.(ISSN 1000 0976;In Chinese)  
As a kind of new and developing unconventional resources,coalbed gas is attached by more and more importance.China National Petroleum Corporation has successively tried to make the experiment at more than ten wells,but the technological test needs much investment and the benefit of the exploration is low due to low individual well producing rate.In order to reduce the cost of coalbed gas well drilling,through using the successful experience in slim hole drilling of the conventional oil and gas wells both abroad and at home for reference and in view of the characteristics of coalbed gas,the bit for slim hole drilling,coal bed protection and coring technology in slim hole,etc.have been studied and the rig for slim hole drilling was selected for the test of slim hole drilling in coal bed.Through a comparison,the economic benefit in slim hole drilling for coalbed gas has been analyzed.In this paper,the actual drilling situation for coalbed gas and the situation of slim hole drilling technique and technological test for coalbed gas by CNPC is presented.
【CateGory Index】: P634
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