西南石油大学学报(自然科学版)

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Optimization Technique of Drilling Design and Path Control About Ultra-deep Horizontal Well in Yuanba

Liu Yan, Wang Jianbo, Long Kaixiong, Dong Bo, Long Lin   

  1. Yuanba Gas Field Development and Construction Projects,Southwest Oil and Gas Company,SINOPEC,Langzhong,Sichuan 637400,China
  • Online:2014-08-01 Published:2014-08-01

Abstract:

Yuanba gas field is the deepest marine sour gas field in the world. The main gas reservoir of Changxing group has characteristics of ultra-depth,high temperature,high pressure,high hydrogen sulfide,thin reservoir,great lateral change and complex gas-water relationship,etc. The production of conventional vertical wells,directional wells is low,so the design adopts the horizontal well development. The well drilling is faced with the challenges of hard rocks,borehole collapse,jamming of drilling tool,mud loss,blowout,and hydrogen sulfide,etc. There are many complex accidents and high security risks in construction. According to the analysis of formation pressure and real drilling data,we decide on five section casing program design and conventional directional well bottom hole assembly. Optimization of deep well casing program and trajectory control technology have been successfully applied to 10 ultra-deep horizontal wells,ensuring the successful implementation of project deployment wells and reaching the goal of the optimized drilling and long horizontal interval extended to high quality reservoir. The drilling tests have obtained high yield,and created new records of drilling engineering at home and abroad.

Key words: high sour gas reservoir, ultra-deep horizontal well, well bore structure, path control, technique optimization