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《NATURAL GAS INDUSTRY》 2000-02
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A STUDY OF THE MECHANISM TO REMOVE CUTTINGS BED IN EXTENDED REACH WELL BY UTILIZING ROTATIONAL ACTION

Shi Xiaobing(Department of Petoleum Engineering,Southwest Petroleum Institute).NATUR.GAS IND.v.20,no.2,pp.51~53,3/25/2000.(ISSN 1000 0976;In Chinese)  
Hole cleaning is one of the key techniques in extended reach well drilling.For extended reach well,the cuttings bed is the key factor restricting hole cleaning.Besides the hydraulic action and rheological parameter of mud,the rotational action of drilling string is an important factor for removing the cuttings bed.Through researching and analyzing the annulus flow field under the rotational action of drilling string,the mechanical mechanism of removing cuttings bed by rotation of drilling string is revealed,namely the rotational action makes the pressure distribution fluctuated,causing a circulating force and gyroscopic force favourable to cuttings removal.The fluctuant pressure makes the cuttings bed unsteady but the circulating and gyroscopic force serves the function as stirring and supporting the cuttings bed,being convenient to make the cuttings to be carried by the annular return velocity.Taking the well Hong 9 1 in Dagang Oil Field for example,the important role of the rotation of drilling string in removing cuttings bed in extended reach well is expounded.
【CateGory Index】: TE24
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【References】
Chinese Journal Full-text Database 1 Hits
1 WANG Zhifeng1,2 (1. College of Petroleum Engineering, China University of Petroleum, Dongying 257061, China; 2. Research Institute of Drilling Technology, Shengli Petroleum Administration Bureau, Dongying 257017, China);Cuttings bed clearage of complex structural wells[J];Oil Drilling & Production Technology;2009-01
【Citations】
Chinese Journal Full-text Database 1 Hits
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