Research of Dynamic Frictional Drag and Deformation of Running Drill#br#
String in Liner Cementing

doi:10.11885/j.issn.1674-5086.2014.04.18.03

Abstract

Abstract:

This paper systematically studies the dynamic frictional drag and deformation of running drill string in liner cementing.
The objective of the research is to evaluate the safety of the running drill string in liner cementing. At first，according to
the structure size of drill string assembly and wellbore configuration size，the mechanical model of drill string under the fluid
frictional drag was constructed，and the analytical mathematical model of the frictional drag and deformation of drill string
caused by the flow of injected fluid in liner cementing was derived. And then，based on the structure size of drill string assembly
and the fluid property of multi-densities and variable volume fluids in drill string，the analytical mathematical model of the
depth of multi-densities fluid varying with the injecting time was deduced. Based on these mathematical models，the software，
which evaluates the safety of the running drill string in liner cementing，was applied to well LG63 in Sichuan，and proved to be
reliable and applicable. The research results indicate that under the action of the multi-densities fluid in the running drill string，
the mathematical models and the software can find out the pumping fluid rate when the alternate load occurs in the running drill
string，and optimize the parameters of safe operation of the running drill string. It provides a reliable means and approach for
the safety evaluation of running drill string caused by the dynamic frictional drag and deformation string in liner cementing.

Key words: liner cementing, running drill string, frictional drag, deformation, mathematical model

CLC Number:

TE931

LIAN Zhanghua1*, ZHENG Jianxiang1, ZHANG Ying1, SHI Lei2, MU Fengying3. Research of Dynamic Frictional Drag and Deformation of Running Drill#br# String in Liner Cementing[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.04.18.03.

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Research of Dynamic Frictional Drag and Deformation of Running Drill#br# String in Liner Cementing

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