BlockFORM High Filtration Loss Plugging Technology

n  Technical Introduction

    BlockFORM high filtration plugging technology is widely embraced on-site for its ease of use, rapid effectiveness, high success rate, and broad applicability. The mechanism involves the slurry prepared by the plugging agent entering the lost well section, where it rapidly loses water under the pressure difference between the mud column and formation pressures. Solid components aggregate and thicken to form a filter cake, which is then compacted and filled to slow down the loss channel. Additionally, the resulting blockage features a highly permeable microporous structure and overall filling characteristics, allowing breathability and permeability while preventing mud penetration. The formed smooth and flat mud cake further seals the lost circulation channel. Large particle inert materials or long fiber materials can be added to block larger leakage channels, leveraging their bridging effect to reduce the cross-sectional area of the original leakage channels and facilitateblockage formation.

n  Technical Features

    ( 1 ) Preparation of special plugging slurry to avoid long-term retention of cracks from drilling fluid plugging slurry.

    ( 2 ) Direct utilization of base oil slurry for plugging oil-based drilling fluids.

    ( 3 ) Direct utilization of water-based drilling fluid for plugging leaks.

    ( 4 ) The blocking agent exhibits excellent bridging ability and can form blockages at joints.

    ( 5 ) Utilizes a microporous structure with high permeability and overall filling characteristics, allowing breathability and permeability while facilitating smooth fluid travel on the surface of the mud cake. 

n  Application

    This plugging technology has been applied in many oilfields of CNOOC, PetroChina and Sinopec. The success rate of plugging at one time has reached more than 80%. It has successfully solved the problem of repeated loss of multiple wells. It has been extremely successful in the aspects of pressure lifting in the whole hole and loss return of fault. The field feedback is good.