SAND CONTROL SYSTEM WITH MULTILAYER  GRAVEL PACK FOR  HOT - RECOVERY CASING WELLS

Gravel packing sand control completion process is aimed at productive formation and loose formation and easy sand production well.

Gravel packing operation is carried out at the early stage of completion. Gravel packing is used between screen tube and casing (perforation) shaft wall to fill it, forming a continuous and stable high strength sand body, preventing formation sand from migrating to the wellbore, thus solving the problem of sand production.

A single multilayer gravel pack sand control process is  designed to fire multiple oil and gas Wells simultaneously  inside the casing, and each layer needs to be filled with sand  control completion.In this process, multi-layer sand control  tools and service tools can be inserted at one time to set and  fill layer by layer.  The isolation seal and isolation packer can ensure that the  filling fluid will not cross layers.It can realize the gravel pack  sand control operation of multiple uneven pay zones under  a single string, greatly reducing the completion time. 

◎ Tthe packer setting and filling of each layer can be  completed in a single well with multiple layers and a  single string, so as to improve operating efficiency; 

◎ multi-layer sand control tools and service tools are  inserted into the pipe string in one trip; 

◎ positioning tool locates the filling position to prevent the  displacement of the pipe string during filling; 

◎ any filling layer shall be isolated from other layers to  prevent completion fluid leakage; 

◎ after filling each layer, the filling can be tested. If the  filling effect is not good, the filling can be repeated.