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《NATURAL GAS INDUSTRY》 1996-04
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35 Spatial Configuration of Deflecting Well and It′s Practical Calculation Theory

Gong Weian Gong Weian(Drilling and Production Techmology Resesarch Institute of changoqing Petroleum Adminis-tration)  
Hole curvature(total angular hcange rate,dogleg srverity)is an important standard to measure the wellbore puality.Based on cylindrical fitting technipue,the parametric equation of borehole curve for derlecting well is built for the first time.Through diffferential geometry theory,the,new calcula-tion formula for hole curvature and bending deflection are obtained,in addition,it proves curvity difference for different points on the same sectionof borehole."Dogleg plane"is an imaginary plane,Lubinski formula only suits for deviation angle and azimuth small changes,in theis case,the 3-D analysis on Lu-binski formula is right.The mathematical description of spatial configuration cam effectively guide the,de-sign for deflecting wells and horizontal wells;casing strength design for crooked section;and 3-D analysisof drill tool assembiy or casing centralizer.
【CateGory Index】: TE22
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