Friction and Torque Control Technology For Slim and Long#br#
Horizontal Well

doi:10.11885/j.issn.1674-5086.2013.10.04.02

Abstract

Abstract:

The development mode of Slim-and-long-section horizontal well with staged fracturing approach in Daniudi Gas
Field has achieved the desired effect，however，there are still a series of problems，especially friction torque control problems
for the later part of the horizontal section. In this paper，based on theoretical analysis and practical drilling engineering features，
segmented calculation model for drag and torque is established，and influencing rules are analyzed，such as horizontal section
length，trajectory profile，BHA and drilling fluid rheology，etc. The results show that with the increase of horizontal section
length，friction and torque of drilling or POOH increases. When the friction torque does not increase，the length of the horizontal
section reaches limitation. With increase of before A target displacement，friction and torque also increase. In addition，using
combinations of drill pipe（101.6 mm/114.3 mm+88.9 mm）is not only conducive to carry rocks for high deviation angle and
horizontal section，but also available to effectively control the friction and torque at the same time. The lower the yield value
and plastic viscosity of drilling fluid，the lower friction and torque. Applying friction torque control technology to DPH7，
horizontal section trajectory is smooth，and the average dogleg is 1.79°/30 m.

Key words: slim-hole, long Horizontal section, friction and torque, soft-string model, stiff-string model, continuous girder
model

CLC Number:

TE25

He Shiming1, Tang Ming1*, Xiong Jiyou1, Zheng Fenghui2, Deng Honglin3. Friction and Torque Control Technology For Slim and Long#br# Horizontal Well[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.10.04.02.

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Friction and Torque Control Technology For Slim and Long#br# Horizontal Well

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