The anti-caving drilling fluid technology during the process of directional drilling in Yi 284 block
Yi 284 oilfield was located to the northern steep slope zone of Bonan depression on Zhanhua de-pression in Jiyang depression.Due to the complex geological structure of the block,the drilling fluid technolo-gy including borehole stability,the wellbore purification,lubrication and anti-jamming were difficult.Through the optimal treatment agent,the polyamine drilling fluid system with strong inhibition and lubrication anti-col-lapse ability was constructed,and the system was applied on site in 8 wells in Yi 284 block,and combined with on-site drilling fluid maintenance and treatment technology,the wellbore wall was stable during the drill-ing process,the wellbore purification effect was good,and the directional flow was smooth.The average well-bore enlargement rate of the target layer was 6.52%.Compared with the pre construction wells in the block,the average drilling cycle was decreased by 8.41%,the average completion cycle was decreased by 9.13%,and the average mechanical drilling speed was increased by 9.17%.At last,the good effect of fast and optimal drill-ing was achieved.
directional anti-collapseborehole cleaninglubrication and anti-jammingpolyamine with strong inhibitionborehole stabilitydrilling fluid
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