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Horizontal well oil-based mud cementing fluid technology
Summary：Difficulties: high oil content; casing not centered; large scale fracturing.
Difficulties: high oil content; casing not centered; large scale fracturing.
Measures: oil-based flushing fluid drive oil, water-based isolation fluid interface wetting flip, toughness cement slurry to improve impact resistance, control density difference, viscosity difference to improve displacement efficiency.
Since it was first applied and adopted in 139.7mm gas layer casing single-stage cementing (0-4715.41m) of Jiaoye 12-4HF well constructed in Fuling Jiaoshiba dam structure on November 13, 2013, 41 oil-based mud cementing wells of shale gas horizontal wells have been constructed as of early June this year, with a horizontal section length of 1000-1600m, a cementing quality qualification rate of 100 and a horizontal section cementing quality rate of 100.
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