关键词: 高压, 巨厚盐膏层, 大斜度井, 工程设计优化

Abstract: The South Hojambaz gas field is located in eastern Turkmenistan with thick salt-gypsum layers and high formation pressure. In the former Soviet Union period, vertical wells were drilled in this area, but the drilling success rate was very low. There is no precedent for drilling directional wells. After PetroChina won the right to develop the gas field, one vertical wellbore and one small angle directional well have been completed. In order to increase the production per well and the speed of gas field development, it is necessary to study the feasibility of development of high deviated wells. Well SHo-jb-102D is a high deviated directional well in the South Hojambaz gas field in Turkmenistan, which is with small target area, 1 085 m thick of salt-gypsum player and 2.2 ~ 2.3 pressure coefficient. And there are various drilling risks such as high pressure, not straight in vertical section, keyway, shrinkage, adhesion, well leakage, drilling tool accident, etc. This paper mainly analyzes the advantages and disadvantages of several well body structures, well trajectory and control methods,and optimizes the design of safe and reliable drilling well. The field practice is carried out to make technical reserve for the development of high deviated wells and horizontal wells in this gas field.

Key words: high pressure, heavy salt-gypsum formation, high deviated well, engineering design optimization