摘要
随着塔河油田及周缘勘探开发的深入及勘探领域的外扩,油藏埋深不断增加,原有井身结构开始显现出其局限性,并影响钻井提速和钻井安全。为解决这一问题,根据具体地层情况,结合"自下而上"和"自上而下"井身结构设计方法,根据地层压力分布情况和必封点确定表层套管、技术套管和油层套管的直径和下深,将四开井身结构简化为三开井身结构,将ф177.8mm套管优化为ф193.7mm套管,形成了适合塔河油田主体非盐区等地质条件相对简单区块超深井高效钻井的ф193.7mm套管直下三开井身结构;采用ф265.1mm或ф206.4mm套管封隔盐膏层,形成了适合塔河油田主体盐体分布区超深盐层井优快钻井的"长裸眼穿盐"和"专封盐膏层"井身结构;采用ф273.1mm(ф311.1mm)、ф206.4mm(ф241.3mm或ф215.9mm)等非常规套管-井眼尺寸,形成了适合地质条件复杂区块超深井安全钻井的井身结构。通过简化井身结构、优化套管直径及下深,实现了地质条件相对简单区块的钻井提速、提效目的;通过优化非常规井身结构,确保了在地质条件复杂区块的安全钻进。
With the expansion and extension of exploration and development in the Tahe Oilfield and its periphery,the original casing program revealed it had limitations in the deeper reservoir,affecting drilling speed and safety.For specific formations,based on the bottom-up and top-down casing program design methods,and considering the formation pressure distribution and setting position,the size and running depth of surface,intermediate and production casings were determined.The original four-stage casing program was simplified to a three-stage one.Specifically,by optimizingф177.8 mm casing toф193.7 mm,a new three-stage casing program was designed for high-efficient drilling of ultra-deep wells in areas in simple geological conditions,such as the non-salt area in the Tahe Oilfield.Usingф265.1mm orф206.4mm casing to isolate salt-gypsum layer,a casing program of long open hole through salt-gypsum layer and special casing sealing salt-gypsum layer was designed for fast drilling of ultra-deep wells in salt areas in the Tahe Oilfield.With unconventional casings ofф273.1 mm（forф311.1 mm hole）andф206.4 mm（forф241.3mm orф215.9mm hole）,a casing program was designed for the safe drilling of ultra-deep wells in areas under complex conditions.By simplifying casing program and optimizing the size and running depth of casing,the drilling speed and efficiency could be improved in areas with relatively simple geological conditions.By optimizing the unconventional casing program,safe drilling could be conducted in areas with complex geological conditions.
出处
《石油钻探技术》
CAS
CSCD
北大核心
2015年第1期75-81,共7页
Petroleum Drilling Techniques
关键词
超深井
盐膏层
火成岩
井身结构
优化设计
ultra-deep well
evaporite bed
igneous rock
casing program
optimal design
