摘要
临兴区块致密砂岩气储层裸眼水平井分段压裂过程中,存在压裂施工参数不易确定,投球时机把握不准,压裂液低温破胶难,返排效率低,压后大量产水等问题。在分析气藏特点和借鉴多级压裂经验的基础上,通过油藏数值模拟、压裂模拟优化,将裸眼水平段分成6~12段进行压裂,加砂排量4 m^(3)/min,平均砂比19%~23%;优化投球程序,保证球能顺利到位打开滑套,同时尽量降低过顶替量;优选低浓度速溶瓜胶压裂液体系,实现低伤害、低温快速破胶;采用液氮伴注和快速放喷返排技术,提高压裂液返排速度和效率;对目标层段进行压裂控水优化,避免压后大量产水。该技术为临兴区块致密砂岩气藏开发提供了有力技术支撑。
In staged fracturing of open hole horizontal wells in tight sandstone gas reservoirs in Linxing Block,it is difficult to determine fracturing operation parameters,to grasp the timing of balling,and to break gel with fracturing fluid at low temperature.Meanwhile,the flowback efficiency is low and the amount of water production is large after fracturing.Based on the analysis of the characteristics of gas reservoir and the experience of multistage fracturing,through reservoir numerical simulation and fracturing simulation optimization,the open hole horizontal part is divided into 6-12 sections for fracturing,the sand adding displacement is 4 m^(3)/min,and the average sand ratio is 19%-23%;in addition,the optimization of ball throwing program can ensure that the ball can be placed smoothly,open the sliding sleeve,and reduce the over displacement as far as possible;The low concentration instant guar gum fracturing fluid system is optimized to achieve low damage,low temperature and rapid gel breaking;liquid nitrogen injection and rapid blowout flowback technology are adopted to improve the flowback speed and efficiency of fracturing fluid;fracturing water control optimization is carried out for the target interval to avoid large amount of water production after fracturing.This technology provides strong technical support for the development of tight sandstone gas reservoir in Linxing Block.
作者
张云鹏
杨生文
赵战江
金鑫
李宇
赵俊
ZHANG Yunpeng;YANG Shengwen;ZHAO Zhanjiang;JIN Xin;LI Yu;ZHAO Jun(Engineering Technology Branch of CNOOC Energy Development Co.,Ltd.,Tianjing 300450,China;Jinxi Branch of China United Coalbed Methane Company.Lyuliang,Shanxi 033200,China)
出处
《油气井测试》
2021年第2期61-66,共6页
Well Testing
基金
国家科技重大专项“临兴—神府地区煤系地层煤层气、致密气、页岩气合采示范工程”(2016ZX05066)。
关键词
临兴区块
致密砂岩气藏
裸眼水平井
分段压裂
低温破胶
液氮助排
快速放喷
压裂控水
Linxing block
tight sandstone gas reservoir
open hole horizontal well
staged fracturing
low temperature gel breaking
liquid nitrogen drainage
rapid blowout
fracturing water control
