A cooling oil-based selective water plugging method
A selective and cooling technology, applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve the problem of increasing the cost of water blocking agent, and achieve the effect of low cost of measures
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[0024] In a well in Liaohe Oilfield, the Xinglongtai reservoir was treated, the effective thickness of the treated well section was 1339.5-1467.8m / number of layers was 47.9 / 10, and the formation temperature was 62°C. Before the measures, the daily fluid production was 63 cubic meters, the daily oil production was 1.9 tons, and the water cut was 97%. Squeeze 164 cubic meters of self-produced heavy oil preheated at 85°C from the casing (ground degassed viscosity 3564MPa.s, temperature inflection point 72°C). Enter 45 m3 of cold water at 12°C for heat exchange in the formation. After shutting down the well for 24 hours, the well will be opened for normal production. Seven days after the measures were taken, the average daily liquid production was 40 cubic meters, the daily oil production was 6 tons, and the water content was 85%. The accumulative increase of oil is 192 tons (deducting the amount of squeezed heavy oil), and the validity period is 64 days. The effect is obvious.
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