Research And Application Of Sea Aminebased Drilling Fluid

In recent years, there is a new high-performance water-based drilling fluid, which has been paid concern at home and abroad. This drilling fluid has strong inhibition such as oil-based drilling fluid. This drilling fluid has many advantages, such as with good water solubility, low toxicity, good compatibility with other additives, not easy to hydrolysis, biodegradable, etc. The essence of this drilling fluid is a kind of organic amine compound, which has strong inhibitory effect on hydration of clay. Consulting the existing synthetic technology of organic amine compound, a new type of organic amine- amine polymeric alcohol was synthesized, with polyethylene glycol(peg) as the main raw material, Rainy Ni as catalyst, using liquid ammonia catalytic amine compound, evaluated the performance and used in the production.The physical and chemical properties and inhibition of amine polymeric alcohol was analyzed; the modification of adding amine polymeric alcohol to the existing sea drilling fluid system was determined; the various properties of the new amino drilling fluid system was evaluated. Experimental results showed that amine polymeric alcohol had surface active, high total amine value, strong inhibition of the clay hydration, and non-toxicity. The adding of Amine polymeric alcohol affected existing drilling fluid’s rheological and filtration slightly. The new amine drilling fluid system had obvious inhibitory capability and property of heat resistance, salt resistance, calcium resistance and anti-pollution, considered as one of the environmental friendly and non-toxic water based drilling fluid system. It was successfully applied in five wells. Application results showed that amine drilling fluid not only improved the bore hole stabilization of shale formations, but also solved the intractable problems of drilling fluid Rheological properties on shale formation. It also reduced balling and coalescence phenomenon and improved ROP, saving the drilling and completion time. The new amine drilling fluid system will be widely applied in future since it satisfies the requirement of oil and gas layer protection and no harm to the environment.