Horizontal directional crossing are still very young at home and even abroad. However, in recent years, thanks to the substantial development of pipeline directional crossing and large-scale construction of domestic oil & gas pipelines, crossing length and diameter have kept updating the records. Drilling fluids plays an important role in directional crossing projects for its decisive impact on the projects’ effects.

Directional crossing projects demand strong drilling fluids performance:

Drilling fluids, fairly important for directional crossing projects, is a mixture of water, bentonite, additives, etc. with its composition adjustable on actual requirements in the projects. Complex geology and large crossing diameter & length demand strong drilling fluids performance, and, correspondently, different concoction measures to ensure successful crossing.
 

1. Drilling fluids should have appropriate viscosity and liquidity and good ability to carry drill cuttings. In this way, it can stay suspended at the bottom of borehole and its liquidity can easily carry cuttings back to the ground.

2. Drilling fluids should be able to well protect the inner walls and better stabilize the drill hole wall, especially so for those formations of large-hole-diameter and easy-to-collapse.

3. Drilling fluids should be highly lubricative so as to well smooth drag of pipelines. It is especially effective in longer crossing projects that lubrication grease can reduce friction coefficient and back dragging force of pipelines.

4. In order to satisfy the requirements in crossing projects, the fluids pressure and flow should be adjusted from formation to formation and from phase to phase.

KOSUN's solids control system, whose design and manufacture are mainly done by Xi’an KOSUN Machinery Co., Ltd., has found wide application not only in oil drilling and exploration, but also in horizontal directional crossing projects for stage treatment of directional drilling fluids. Its work in the Qiantang River Crossing Project of Hangzhou-Ningbo Gas Pipeline Engineering in China is one of the successes done by KOSUN’s products, whose stability and advanced technologies allowed the project’s completion on schedule and precision of crossing.

The products KOSUN can provide for oilfield and drilling fluid solids control system including drilling mud shale shaker, drilling fluids mud cleaner, desander, desilter, drilling fluids centrifuge, vacuum degasser, mud tanks, mud gun, mud agitator, drilling mud centrifugal pumps and all the other solids control equipment, complete solids control system, etc.