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《China Petroleum Machinery》 1997-05
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Three-dimensional calculation of sucker rod centralizer spacing in deviated well

Tan Chengjin; Hu Xiaobing; Gao Deli(Tsinghua University, Beijing)  
Wear between sucker rod string and tubing string in a deviated well can be reduced by the proper setting of sucker rod centralizers. Thereby the overhaul period of the well can be extended and the production coct can be cut down. The axial load and centralizer spacing from the bottom tO the top are calculated by using the mechanical analysis method and the well trajectory data. By assuming the rod string contacting with the tubing string only at the centralizers, the rational centralizer spacing and the axial force and lateral force on the upper centralizer are determined by means of repeated pilot calculation. Investigation shows that the space between two adjacent centralizers depends on the above-mentioned axial force, lateral force, wellbore dimensions, bending rigidity and clearance between the rod and the tubing; the force on the end of the rod string depends on the liquid pressure, plunger weight, friction, liquid resistance and inertia; and the lateral foree depends on the wellbore dimensions, axial force and rod weight. The calculation instance and application show that the above-mentioned method of calculation is feasible.
【CateGory Index】: TE93
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