Abstract
Formate drilling and completion fluid system is a new type of clean organic salt brine system which has been developed from inorganic salt brine drilling fluid system. It is beneficial to protecte and find hydrocarbon reservoir. Due to the solid free system, the damage of solid phase particles on reservoir, especially low permeability oil and gas layer, can be greatly eliminated, at the same time, drilling fluid and completion fluid have greater compatibility. It will avoid that precipitation which is not compatible with drilling and completion fluid and generates damages on reservoir. And because mud cake of the solid free system is thin and resilient, it is conductive to improve cementing quality greatly. Experiments show that the formate drilling and completion system has good rheological property, strong inhibition ability, good lubricating performance, good compatibility with reservoir rocks and formation water at high temperature.
Highlights
Formate drilling and completion fluid is a new type of clean brine system which has been developed from inorganic salt brine drilling fluid system
The formate drilling and completion fluid system has been applied to the deep well of Lungu area in Tarim
The formate drilling fluid is of good rejection capability and shale stability
Summary
Formate drilling and completion fluid is a new type of clean brine system which has been developed from inorganic salt brine drilling fluid system. Some scholars have studied this before, such as Liuyu has published a paper of “Researches and uses of solids-free high density formate and high temperature crosslinking water base systems as drill-in fluid” in 2005. He has applied the drilling fluid into Liaohe Oilfield and the petroleumin-place has been increased. Wang Yongsheng has studied the application effect of the formate drilling fluid in Yingtai gas field in 2012. This drilling fluid system has helped to protect the reservoir and save the exploration cost. Based on the previous research, this paper is studied for some new findings and applications [1]
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