西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (6): 169-172.DOI: 10.3863/j.issn.1000-2634.2008.06.041

• 博导论评 • Previous Articles     Next Articles

PROBE INTO ANTIDEFLECTION OF TAPERED DRILLSTRING ASSEMBLY WITH EQUIVALENT DIAMETER METHOD

LIAN Zhang-hua1 LIN Tie-jun1 SONG Zhou-cheng1，2 MENG Ying-feng1 WEI Chen-xing1   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu Sichuan 610500，China；2.Tarim Oilfield Co.，CNPC，Korla Xinjiang 841001，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-12-20 Published:2008-12-20

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Abstract: Tapered drillstring assembly as the antideflection drilling tool is commonly used in gas drilling vertical wells，but the effect of antideflection is uncertain.In this paper，equivalent diameter method of Three Moment Formula is used to research unequal crosssection tapered drillstring assembly mechanical properties.A simple Visual Basic(VB) program for analyzing and optimizing tapered drillstring assembly mechanical properties is developed to adjust drilling parameter based on the equivalent diameter calculated.At the same time，ANSYS finite element secondary development program (ADPL) is used to lateral force calculation.Thus，there is comparative analysis of the two results.Case study shows that the VB program for calculating tapered drillstring assembly is more accurate and the calculating results are highly precise.Also，the influencing factor of antideflection drilling is discussed and some suggestion for improvement given.

Key words: gas drilling, tapered drillstring assembly, equivalent diameter method, well trajectory

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