Develop The Study Of The Isolation Liquid System

The main aim of cementing is to form integral cement sheath,and its quality has a direct impact on the life of oil wells.Now,annular gas channeling and sustained casing pressure which bring risks to production is ubiquitous,and improving flushing spacer fluid foe drilling fluid efficiency is one of the important measures to ensure the cementing quality.Therefore,the flushing efficiency of oil-based drilling fluid and its high temperature stability are studied in this paper.The indoor experiment results show that:(1)Through the anti-high temperature isolation mechanism of the suspension mechanism,and evaluated the two kinds of stabilizers,through experiments,when the liquid stabilizer DRY-S1 and pre-liquid high temperature stabilizer DRY-S2 with the use of,you can use Flushing isolation liquid 180?under the conditions of the density difference of?0.02g/cm~3,free liquid?0.02%,can effectively prevent the stability caused by the ring bridge.(2)The flushing efficiency was about 50%when the rinse solution DRY-100L was not added to the flushing solution,and the flushing efficiency after adding the rinse liquid DRY-100L Can reach more than 80%,and with the flushing isolation and drilling fluid density difference increases,rinse efficiency increases.(3)Flushing isolation fluid has good compatibility with drilling fluid and cement slurry.When it is subjected to 7:3 test and 7:2:1 test,the slurry does not show flocculation and thickening,and the thickening time is not Shortened to meet the requirements of the site construction on the flushing isolation(4)The flushing and isolation liquid was successfully applied in the?127mm tailgate cementing wells in the No.3 well in the North China Oilfield.The flushing and isolation fluid had good stability.At the same time,the experiment was carried out to study the drilling fluid.Pollution problem.The final site construction smoothly.