腐蚀环境下基于井筒完整性与流动保障的完井技术

为保证油井安全高效生产,研究了一套适合含H_2S、CO_2等腐蚀性气体的井筒完整性与流动保障的完井技术。根据研究区块油藏地质特征,基于油气井节点分析理论,优选了完井管柱尺寸及举升方式;考虑完井管柱和关键完井工具尺寸等因素,优选了研究区块油井完井井身结构及配套的完井管柱结构;根据材质选择图版及完井成本确定了完井管柱材质。在此基础上,对完井管柱在初始状态、下入管柱、稳定生产、气举生产及起出管柱等关键工况下的强度进行校核,并设计了配套的完井工艺。该完井技术在研究区块25口井应用效果良好,不仅能够满足油井正常生产,而且具有防腐、防沥青等特点,可推广应用于国内外同类油田。

WELL COMPLETING TECHNIQUE BASED ON THE WELLBORE INTEGRITY AND FLOW ASSURANCE IN THE CORROSIVE ENVIRONMENT

In order to ensure the safe and high-efficiency production of the oil wells,a set of the well completing technique of the wellbore integrity and flow assurance were studied for the corrosive gas such as H2S,CO2,etc.According to the geological characteristics of the oil reservoirs in the researched block,based on the theory of node analysis of oil/gas wells,the well-completing tubing sizes and manner of the lifting were optimized;considering the factors including the well completion string,the sizes of the key completing tools and so on,the borehole structures of the oil well completion and matched completion string configurations were optimized;according to the material selecting chart board and well completion cost,the material quality selection for the well completion string was determined.On the basis of the above,the strength of such string under the initial status condition of the well completion string,run string,stable production,gas lift production,pulling out of the string etc.were verified,and moreover the related well completing technology was designed.The well completion technology was applied in 25 wells of the research block,and furthermore much better effects were achieved.These achievements can not only meet the normal production of the oil wells,but also possess the characteristics of anti-corrosion,anti-asphalt,etc.Therefore,the well completing technology will be proposed to further popularize in the development of the similar oilfields at home and abroad.