Top cement + Bottom expansion packer segmented transformation technology

Description of Technology :

• One trip run into of tubing string can meet the needs of top tubing cementing and open hole segmented fracturing.

• Configure drillable ball seat fracsliding sleeve can achieve internal cleaning and ball seat grinding be completed simultaneously after construction is done.

• The upper part of cementing sliding sleeve is provided with a sealing mechanism to ensure the wellbore's integrity of the fracturing string during fracturing.

• Oil and water expansion packers can assist cementing and sealing to prevent cement slurry contamination and late layer formation.

The structure of tubing string:

• Tubing string +Tie back sealing tubing string + Cement hydraulic control sleeves + Expansion Packer +SF fracsleeve + Hydraulic control sleeve + Inflation sub + Float collar + Float shoe

• Seal bore extension+ Tie back sealing insert.